Copyright © 2002 by Karl E. Wiegers. Permission is granted to use, modify, and distribute this document.
Software Requirements
Specification
for
nTravel
Version 1.1 approved
Prepared by
NAMMPSoft Inc.
11.1.2007
Software
Requirements Specification for nTravel Page ii
Table of Contents
Table of Contents.......................................................................................................................... ii
Revision History............................................................................................................................ ii
1. Introduction..............................................................................................................................1
1.1 Purpose............................................................................................................................................. 1
1.2 Document Conventions.................................................................................................................... 1
1.3 Intended Audience and Reading Suggestions.................................................................................. 1
1.4 Project Scope ................................................................................................................................... 2
1.5 References........................................................................................................................................ 2
2. Overall Description..................................................................................................................3
2.1 Product Perspective.......................................................................................................................... 3
2.2 Product Features............................................................................................................................... 3
2.3 User Classes and Characteristics...................................................................................................... 5
2.4 Operating Environment.................................................................................................................... 5
2.5 Design and Implementation Constraints .......................................................................................... 6
2.6 User Documentation ........................................................................................................................ 6
2.7 Assumptions and Dependencies....................................................................................................... 6
3. System Features .......................................................................................................................6
3.1 Take a Picture .................................................................................................................................. 6
3.2 Save a Picture................................................................................................................................... 8
3.3 Translate Written Language........................................................................................................... 10
3.4 Translate Spoken Language ........................................................................................................... 12
3.5 Translate Signs............................................................................................................................... 15
3.6 Update Device Software ................................................................................................................ 17
3.7 Set Language.................................................................................................................................. 19
3.8 Synchronize Files........................................................................................................................... 21
4. External Interface Requirements.........................................................................................24
4.1 User Interfaces ............................................................................................................................... 24
4.2 Hardware Interfaces ....................................................................................................................... 24
4.3 Software Interfaces ........................................................................................................................ 25
4.4 Communications Interfaces............................................................................................................ 25
5. Other Nonfunctional Requirements.....................................................................................25
6. Other Requirements ..............................................................................................................26
7. System Requirements Chart.................................................................................................26
Appendix A: Glossary .................................................................................................................32
Appendix B: Analysis Models.....................................................................................................33
Appendix C: Issues List...............................................................................................................40
Revision History
Name
Date
Reason For Changes
Version
<<Person’s
name>>
10-04-07
Initial Version
1.0
<<Person’s
name>>
10-18-07
Functional/Nonfunctional Requirements and
others errors
1.1
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Requirements Specification for nTravel Page 1
1 Introduction
1.1 Purpose
The product we have is the Universal Translator (nTravel), revision or release number being
1.0.
1.1.1 Vision Statement
The aim of this product is to create a device that will remove barriers to global
communication. Many people, ranging from tourists to relief workers, will be able to use
this device to facilitate their international activities.
1.1.2 Scope
The scope of this project includes the development of visual and audio translation
algorithms, user interface software for the nTravel device and maintenance of a database
containing global language information. The algorithms work with the information in the
language database to allow the user of the nTravel to translate written or spoken
language.
1.2 Document Conventions
This document follows MLA Format. Bold-faced text has been used to emphasize section
and sub-section headings. Highlighting is to point out words in the glossary and italicized text is
used to label and recognize diagrams.
1.3 Intended Audience and Reading Suggestions
This document is to be read by the development team, the project managers, marketing
staff, testers and documentation writers. Our stakeholders, company manufacturing associated
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Requirements Specification for nTravel Page 2
hardware, company providing embedded operating system, shareholders of NAMMPSoft Inc.
and distributors who markets the finished product, may review the document to learn about the
project and to understand the requirements. The SRS has been organized approximately in order
of increasing specificity. The developers and project managers need to become intimately
familiar with the SRS.
Others involved need to review the document as such:
Overall Description – Marketing staff have to become accustomed to the various product
features in order to effectively advertise the product.
System features – Testers need an understanding of the system features to develop meaningful
test cases and give useful feedback to the developers.
External Interface Requirements – The hardware developers need to know the requirements of
the device they need to build. The marketing staff also needs to understand the external interface
requirements to sell the product by describing the user-friendly features of the nTravel.
Nonfunctional and Functional Requirements – The hardware developers.
1.4 Project Scope
The nTravel has features that enable any one person to communicate with anyone,
whether they speak the same language or not. It also lets people be more familiar with their
surroundings if they are in a foreign place. Refer to the project scope document for further
information.
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Requirements Specification for nTravel Page 3
1.5 References
Please consult the attached project scope document for further information regarding
project scope. A use case diagram has been attached to accompany sections 2.1: Product
Perspective and 2.2: Product Features. A user manual is included to accompany section 2.6: User
Documentation. Product mock-ups and Requirements Validation Plan have also been included
for general reference.
2 Overall Description
2.1 Product Perspective
The software product being developed is for a new portable stand-alone device
which functions as a camera and language translation device for text/audio input and common
signs. The product works with other software products like an Embedded Operating System,
Databases for text and speech, Recognition and Translation Software. The product uses hardware
specially designed for this purpose. The hardware is a 4.5 inches x 2.5 inches x 0.5 inches
rectangular device equipped with a microphone, a camera, speakers, SD Card Slot, USB 2.0 port,
a touch screen and a physical button control panel. Currently, there is no device, which
combines all functionalities the way the nTravel does. Therefore, it is a prototype of a new
product that merges two separate device families: personal translators and digital cameras.Refer
to the attached use case diagram for further information.
2.2 Product Features
The nTravel contains the following key features:
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Requirements Specification for nTravel Page 4
1. Captures an image (containing text), recognizes text from it and translates it to required
language. An exemplary use of this functionality is translating a restaurant menu or a sign
at a market when the language is unfamiliar.
2. Accepts typed in text, translates to foreign language, and displays translated text or audio
output of corresponding text. This functionality is useful when the user wishes to
translate a word from a known language to a foreign language. For example, somebody
attempting to order soup at a restaurant could type in “soup” and then hear how to say the
word for “soup” in the foreign language.
3. Accepts voice input from a microphone, performs recognition using a speech recognizer,
translation using a machine translator, and generation of the translated audio output using
a speech synthesizer. This is useful when attempting to understand foreign radio stations
or television stations, or when attempting to converse with a speaker of the foreign
language.
4. Provides interpretation of common road signs. The device’s rapid translation algorithm
provides a near-immediate translation of road signs to ensure safe transit.
5. Synchronizes to a computer to obtain databases previously downloaded from a web
application developed by the company, using a password-protected secure login. The
company will frequently update the database with new language research, ensuring that
the customer will be have access to the most accurate language data.
6. Stores pictures in either a removable SD card or internal memory (2 GB). The device can
then, either have the SD card removed or be attached to a computer via USB 2.0 to
transfer the image files.
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Requirements Specification for nTravel Page 5
2.3 User Classes and Characteristics
2.3.1 Customer:
Remote customers most frequently use the device for language translation and sign
interpretation purposes. The customers are not expected to have a high educational and
proficiency level or technical expertise. Hence, the user interfaces in available in eight popular
international languages such as English, French, German, Spanish, Mandarin, Japanese, Arabic
and Hindi.
2.3.2 DBA:
The DBA is expected to have a field appropriate college degree and experience of at
least 2 years as a DBA and an additional 5 years in the IT field. He/She has the privilege to
update information in the database and technical expertise in database management. The DBA
does not directly interact with the nTravel device.
2.3.3 Data Entry Level Personnel:
They must have at least a high school diploma or equivalent certification. They do
not have privileges to directly access or modify the database without the permission of the DBA.
The Data Entry Level Personnel do not directly interact with the nTravel device.
2.4 Operating Environment
The software will operate with the following software components and applications:
The software being developed will be running under MontaVista Mobilinux v5.0 embedded
operating system. The hardware that will be running these programs is being developed for this
specific project, and will follow the specifications that appear in this document in section 3. The
synchronization procedures will be written to interface with Windows XP, Windows Vista, and
Mac OS.
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Requirements Specification for nTravel Page 6
2.5 Design and Implementation Constraints
1. Synchronization: uses USB 2.0, connects only to Windows XP, Windows Vista, and Mac
OS X.
2. Memory: device will have 2GB internal hard drive. Software and database cannot exceed
this amount. Device will have a SD card slot, and the software must be able to read and
write to that slot.
3. Language requirements: software must be multilingual, including the following
languages: English, French, German, Spanish, Mandarin, Japanese, Arabic and Hindi.
2.6 User Documentation
For user documentation and information, please consult section 4: External Interface
Requirements and attached user manual.
2.7 Assumptions and Dependencies
It is assumed that the hardware designed will work correctly with the third-party operating
system (MontaVista Mobilinux v5.0) and the developed software.
Because the device acquires database updates through USB2.0, the customer must have a
computer with a USB2.0 port, and have a USB2.0 cable.
3. System Features
3.1 Use case name and identifier – Take a picture (U1)
3.1.1 Objective – The purpose of the U1 use case is to use the device’s optical hardware
to produce the image detected by the optical hardware. This image is displayed on the
device’s screen.
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Requirements Specification for nTravel Page 7
3.1.2 Priority - This requirement is medium priority.
3.1.3 Source – The source of this use case is the customer.
3.1.4 Actors – An end user of the device (a customer) would be the relevant actor for
this use case.
3.1.5 Flow of events-
3.1.5.1 Basic Flow-
3.1.5.1.2 User enters picture-taking mode.
3.1.5.1.3 Device displays what it is “looking at” on screen.
3.1.5.1.4 User presses button for taking picture.
3.1.5.1.5 Picture is stored in temporary memory and displayed on screen.
3.1.5.2 Alternative Flow- At step 3.1.5.1.4, the user decides not to take a
picture.
3.1.5.2.1 User presses cancel button.
3.1.5.2.2 Device exits picture-taking mode.
3.1.5.3 Exception Flow – At step 3.1.5.1.4, the device encounters a problem.
3.1.5.3.1 Device provides error message indicating need for repair.
3.1.5.3.2 Device exits picture-taking mode.
3.1.6 Includes – None.
3.1.7 Requirements-
3.1.7.1 The system shall provide the option to take a picture.
3.1.7.2 The system shall display the currently viewed image.
3.1.7.3 The system shall store the image in temporary memory.
3.1.7.4 The system shall indicate a need for repair if broken.
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3.1.8 Preconditions – User is logged in, optical hardware is operational.
3.1.9 Post conditions – An image is shown on the device’s screen, available for
permanent saving or deletion.
3.1.10 Nonfunctional requirements –
3.1.10.1 Performance Requirements-
3.1.10.1.1 Maximum allowed execution time for U1 use case is 3 seconds,
starting at the time when the user presses the take picture button and
ending when the image has been saved and displayed.
3.1.10.2 Safety Requirements-None.
3.1.10.3 Security Requirements-None.
3.1.10.4 Software Quality Requirements-None.
3.1.11 Notes/Issues – U1 is often followed by the U2 use case.
3.1.12 Special requirements – Always keep enough memory available so that the
current picture can be temporarily saved, in case the user decides to permanently save it.
3.2 Use case name and identifier – Save a picture (U2)
3.2.1 Objective – The purpose of the U2 use case is to enable the user to permanently
store images captured during the U1 use case on the device’s internal memory.
3.2.2 Priority – This requirement is low priority.
3.2.3 Source – The source of this use case is the customer.
3.2.4 Actors – An end user of the device (a customer) would be the relevant actor for
this use case.
3.2.5 Flow of events-
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3.2.5.1 Basic flow-
3.2.5.1.1 User is queried as to whether to save current picture.
3.2.5.1.2 User presses “save” button to indicate desire to save picture.
3.2.5.1.3 Picture is saved to device’s internal memory.
3.2.5.2 Alternative flow- At step 3.2.5.1.2, the user decides not to save the
picture.
3.2.5.2.1 User presses the “cancel” button to indicate desire to not save
picture.
3.2.5.2.2 The current picture is not saved to the device’s internal memory.
3.2.5.2.3 The device goes back to picture taking mode.
3.2.5.3 Exception flow- At step 3.2.5.1.2, the device encounters problem due
to insufficient memory.
3.2.5.3.1 Device provides error message indicating insufficient memory
remaining
3.2.5.3.2 Device prompts user to go to file management mode to make
memory available.
3.2.6 Includes – None.
3.2.7 Requirements –
3.2.7.1 The system shall ask the user whether to save a picture.
3.2.7.2 The system shall store the picture in internal memory.
3.2.7.3 The system shall notify the user if insufficient memory to store the picture
remains.
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3.2.8 Preconditions – User has taken a picture (in U1 use case), sufficient memory is
available to store a picture.
3.2.9 Post conditions – Picture is saved to device’s internal memory.
3.2.10 Nonfunctional Requirements–
3.2.10.1 Performance Requirements-
3.2.10.1.1 Maximum allowed execution time for U2 use case is 3
seconds, starting when user presses the save button and ending when the
picture has been saved in memory and the user has been notified of this
event.
3.2.10.2 Safety Requirements-None.
3.2.10.3 Security Requirements-None.
3.2.10.4 Software Quality Requirements- None.
3.2.11 Notes/Issues – Check on use case identifier for removing pictures from memory.
3.2.12 Special Requirements – Memory must be available for picture to be saved.
3.3 Use case name and identifier - Translate written text (U3)
3.3.1 Objective - The object of the U3 use case is to translate any chosen text, in the
device, to any desired language. It would help anyone understand the foreign text in his
or her device. The foreign text would be typed into the device.
3.3.2 Priority – This requirement is high priority.
3.3.3 Source – The source of this use case is the customer.
3.3.4 Actors - The only actor in this part is the customer.
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3.3.5 Flow of Events-
3.3.5.1 Basic Flow-
3.3.5.1.2 The chosen text is read.
3.3.5.1.3 The language is identified.
3.3.5.1.4 Then, it is compared to the downloaded database in our device.
3.3.5.1.5 The text is then translated into the desired language.
3.3.5.1.6 Final result will be either displayed on the screen or will be
output through the speaker, depending on the user's choice of output.
3.3.5.2 Alternative flow- At step 3.3.5.1.2, the device does not recognize the
language due to incorrect input.
3.3.5.2.1 The device beeps and the message "INVALID INPUT" is
displayed on the screen.
3.3.5.3 Exception Flow- At step 3.3.5.1.4, the device cannot find translations
in the database.
3.3.5.3.1 The device beeps and the message, "NOT TRANSLATED" is
displayed on the screen.
3.3.6 Includes –Typing in the text, comparing to database, displaying translated text.
3.3.7 Requirements-
3.3.7.1 The system shall receive text input from the user.
3.3.7.2 The system shall identify the language of the text entered.
3.3.7.3 The system shall compare the input to the database.
3.3.7.4 The system shall translate the text into the desired language.
3.3.7.5 The system shall output the translated text.
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3.3.7.6 The system shall indicate when a translation cannot be found.
3.3.7.7 The system shall indicate when the text’s language cannot be identified.
3.3.8 Preconditions - The user has already typed in the text.
3.3.9 Post conditions - The text has been translated into the desired language and the
final output has reached the user in the desired form. The user understands the foreign
text.
3.3.10 Nonfunctional requirements –
3.3.10.1 Performance Requirements-
3.3.10.1.1 Maximum allowed execution time for U3 use case is 5
seconds for every 30 words being processed.
3.3.10.2 Safety Requirements-None.
3.3.10.3 Security Requirements-None.
3.3.10.4 Software Quality Requirements-None.
3.3.11 Notes/Issues – None.
3.3.12 Special Requirements - The database needs to be updated frequently by the user
by connecting the device to any computer and looking for updates. There should be fast
processing also.
3.4 Use case name and identifier- Translate spoken language (U4)
3.4.1 Objective - The object of the U4 use case is to translate any chosen speech, in the
device, to any desired language. It would help anyone understand the foreign speech in
his or her device. The foreign speech would be recorded into the device by the in-built
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Requirements Specification for nTravel Page 13
microphone.
3.4.2 Priority – This requirement is high priority.
3.4.3 Source – The source of this use case is the customer.
3.4.4 Actors - The only actor in this part is the customer.
3.4.5 Flow of Events-
3.4.5.1 Basic Flow-
3.4.5.1.1 Speech is recorded by microphone.
3.4.5.1.2 Language being used is identified.
3.4.5.1.3 Speech is compared to database.
3.4.5.1.4 Speech is translated to the desired language.
3.4.5.1.5 Final result will either be displayed on the screen or will be
output through the speaker, depending on the user’s choice of output.
3.4.5.2 Alternative flow- At step 3.4.5.1.2, the device does not recognize the
language due to incorrect input.
3.4.5.2.1 The device beeps and the message "INVALID INPUT" is
displayed on the screen.
3.4.5.3 Exception Flow- At step 3.4.5.1.4, the device cannot find translations
in the database.
3.4.5.3.1 The device beeps and the message, "NOT TRANSLATED" is
displayed on the screen.
3.4.6 Includes - Recording speech, comparing to database, displaying translated speech.
3.4.7 Requirements-
3.4.7.1 The system shall record speech using the microphone.
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3.4.7.2 The system shall identify the language of the spoken words.
3.4.7.3 The system shall compare the input to the database.
3.3.7.3 The system shall query the user as to the format of output to use (text or
speech).
3.4.7.4 The system shall output the spoken language as text.
3.4.7.5 The system shall output the spoken language as speech.
3.3.7.6 The system shall indicate when a translation cannot be found.
3.4.7.6 The system shall indicate when the speech’s language cannot be
identified.
3.4.8 Preconditions - The user has recorded the speech into the device.
3.4.9 Post conditions - The speech has been translated into the desired language and
final output has reached the user in his/her desired form. The user understands the
foreign speech.
3.4.10 Nonfunctional requirements-
3.4.10.1 Performance Requirements-
3.4.10.1.1 Maximum allowed execution time for U4 use case is 5
seconds for every 30 words being processed.
3.4.10.2 Safety Requirements-None.
3.4.10.3 Security Requirements-None.
3.4.10.4 Software Quality Requirements-None.
3.2.11 Notes/Issues – None.
3.4.12 Special Requirements - The database needs to be updated frequently by the user
by connecting the device to any computer and looking for updates. Fast processing is an
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Requirements Specification for nTravel Page 15
additional special requirement.
3.5 Use case name and Identifier-Translate signs (U5)
3.5.1 Objective - The object of the U5 use case is to interpret any chosen sign, with or
without text, in the device. It would help anyone understand the foreign sign in his or her
device. The camera in the nTravel will take a picture of the foreign sign and returns an
explanation of the sign.
3.5.2 Priority – This requirement is medium priority.
3.5.3 Source – The source of this use case is the customer.
3.5.4 Actors - The only actor in this part is the customer.
3.5.5 Flow of Events-
3.5.5.1 Basic Flow-
3.5.5.1.2 The chosen sign is selected from a permanently saved or
temporarily saved picture.
3.5.5.1.3 The language and symbol is identified.
3.5.5.1.4 Then, it is compared to the downloaded database in our device.
3.5.5.1.5 It is then interpreted in the desired language.
3.5.5.1.6 Final result will either be displayed on the screen or will be
output through the speaker, depending on the user's choice of output.
3.5.5.2 Alternative flow- At step 3.5.5.1.2, the device does not recognize the
language due to incorrect input.
3.5.5.2.1 The device beeps and the message "INVALID INPUT" is
displayed on the screen.
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3.5.5.3 Exception Flow- At step 3.5.5.1.4, the device cannot find a translation
in the database.
3.5.5.3.1 The device beeps and the message, "NOT TRANSLATED" is
displayed on the screen.
3.5.6 Includes –Taking a picture of the sign, comparing to database, displaying
interpretation.
3.5.7 Requirements-
3.5.7.1 The system shall identify a sign in an existing picture.
3.5.7.2 The system shall identify the language in a sign.
3.5.7.3 The system shall compare the sign to signs that exist in the database.
3.5.7.4 The system shall translate any text on the sign.
3.3.7.3 The system shall query the user as to the format of output to use (text or
speech).
3.5.7.5 The system shall output the sign information as text.
3.5.7.6 The system shall output the sign information as speech.
3.3.7.6 The system shall indicate when a translation of the sign cannot be found.
3.5.7.7 The system shall indicate when the sign’s language cannot be recognized.
3.5.8 Preconditions – None.
3.5.9 Post conditions - The sign has been interpreted into the desired language and final
output has reached the user in his desired language.
3.5.10 Nonfunctional requirements –
3.5.10.1 Performance Requirements-
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3.5.10.1.1 Maximum allowed execution time for U5 use case is 5
seconds, starting when the user requests a sign translation and ending
when the audio/visual output has been transmitted.
3.5.10.2 Safety Requirements-None.
3.5.10.3 Security Requirements-None.
3.5.10.4 Software Quality Requirements-None.
3.5.11 Notes/Issues – None.
3.5.12 Special Requirements - The database needs to be updated frequently by the user
by connecting the device to any computer and looking for updates.
3.6 Use case name and identifier- Update device software (U6)
3.6.1 Objective - Update is used to update products software applications and database.
3.6.2 Priority – This requirement is low priority.
3.6.3 Source – The source of this requirement is the developers.
3.6.4 Actors – Customer, Customer’s Computer, Master Database.
3.6.5 Flow of events-
3.6.5.1 Basic Flow-
3.6.5.1.1 User connects the device to the computer using a USB 2.0 cable.
3.6.5.1.2 The computer identifies the nTravel as being connected.
3.6.5.1.3 The software on the computer asks the user if it can search online
for updates.
3.6.5.1.4 User says “yes”.
3.6.5.1.5 Software looks for update.
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3.6.5.1.6 If updates are found, they are downloaded to the device &
installed.
3.6.5.1.7 User disconnects the device from the computer.
3.6.5.2 Alternative Flow –At step 3.6.5.1.3, the user says “no”.
3.6.5.2.1 The software exits without updating.
3.6.5.2.2 The user can now remove the device from the computer.
3.6.5.3 Exception Flow – At step 3.6.5.1.1, the computer does not detect the
nTravel device.
3.6.5.3.1 Error message, “UNKNOWN DEVICE” is displayed suggesting
that the user check nTravel software installation on computer.
3.6.6 Includes – None.
3.6.7 Requirements-
3.6.7.1 The system shall communicate via USB 2.0 using the drivers installed on
the user’s computer.
3.6.7.2 The system shall relay information regarding current software version
information such that it can be determined whether a software update is required.
3.6.7.3 The system shall allow software updates to be transferred to it via USB 2.0
from the user’s computer.
3.6.7.4 The system shall indicate when no software updates are available.
3.6.7.5 The system shall indicate when the nTravel device is unrecognizable by
the user’s computer.
3.6.8 Preconditions - Update software given with the device should be installed on the
computer.
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3.6.9 Post conditions - Updates are installed on the device.
3.6.10 Nonfunctional requirements –
3.6.10.1 Performance Requirements-
3.6.10.1.1 Maximum time to perform data synchronization is 10 minutes.
3.6.10.2 Safety Requirements- None.
3.6.10.3 Security Requirements- None.
3.6.10.3.1 Security protocols must be implemented to ensure that
malicious programming cannot pass from the computer to the device.
3.6.10.4 Software Quality Requirements- None.
3.6.11 Notes/Issues – For optimal performance, device’s database should be updated at
least once per month.3.6.12 Special Requirements - The computer should have an
Internet facility available to install updates.
3.7 Use case name and identifier -Set Language (U7)
3.7.1 Objective – The customer can set the text/audio input language and language to
which the text/audio input is to be converted.
3.7.2 Priority – This requirement is high priority.
3.7.3 Source – The source of this requirement is the customer.
3.7.4 Actors – An end user of the device (a customer) would be the relevant actor for
this use case.
3.7.5 Flow of Events-
3.7.5.1 Basic Flow –
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3.7.5.1.1 The user sets the input language and the system gets ready to
store the input.
3.7.5.1.2 The user sets the language in which the translation is needed and
the system retrieves the corresponding database.
3.7.5.2 Alternative Flow – At step 3.7.5.1.1, the user does not find the
required language.
3.7.5.2.1 Device’s language settings remain in current state.
3.7.5.3 Exception Flow –At step 3.7.5.1.1, the language database information
on nTravel device is corrupted and cannot be read.
3.7.5.3.1 Device displays a message indicating error in language database
and a suggestion to download the language database again.
3.7.6 Includes – Update device software (U6).
3.7.7 Requirements-
3.7.7.1 The system shall allow the user to select input language.
3.7.7.2 The system shall allow the user to select output language.
3.7.7.3 The system shall check the updated database to find required language.
3.7.7.4 The system shall get ready to translate via chosen output.
3.7.7.5 The system shall indicate when a database file is corrupt and cannot be
read.
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3.7.8 Preconditions – User must download the language database to the device before
selection.
3.7.9 Post conditions – The device will be ready to translate after the input and output
languages are selected.
3.7.10 Nonfunctional requirements –
3.7.10.1 Performance Requirements-
3.7.10.1.1 Maximum allowed execution time for a language database
change is 20 seconds.
3.7.10.2 Safety Requirements- None.
3.7.10.3 Security Requirements- None.
3.7.10.4 Software Quality Requirements- None.
3.7.11 Notes/Issues – None.
3.7.12 Special Requirements – None.
3.8 Use case name and identifier -Synchronize Files (U8)
3.8.1 Objective – The customer can connect the nTravel device to a personal computer
to transfer saved pictures and notes.
3.8.2 Priority – This requirement is low priority.
3.8.3 Source – The source of this requirement is the customer.
3.8.4 Actors – Customer, Customer’s Computer.
3.8.5 Flow of Events-
Software
Requirements Specification for nTravel Page 22
3.8.5.1 Basic Flow –
3.8.5.1.1 User connects the device to the computer using a USB cable.
3.8.5.1.2 User’s computer identifies the nTravel as being connected.
3.8.5.1.3 nTravel software on user’s computer queries the user for desire
to synchronize nTravel-related files (pictures and notes).
3.8.5.1.4 User indicates desire to synchronize nTravel-related files such
that the files on the computer will be updated with the files currently on
the nTravel.
3.8.5.1.5 Files on nTravel are copied to directory specified by user.
3.8.5.1.6 User disconnects device from computer.
3.8.5.2 Alternative Flow – At step 3.8.5.1.3, the user indicates lack of desire to
synchronize nTravel-related files.
3.8.5.2.1 User disconnects device from computer.
3.8.5.3 Exception Flow –At step 3.8.5.1.1, user’s computer is unable to identify
the nTravel as being connected.
3.8.5.3.1 Error message, “UNKNOWN DEVICE” is displayed suggesting
that user check nTravel software installation on computer.
3.8.5.6 Includes – None.
Software
Requirements Specification for nTravel Page 23
3.8.7 Requirements-
3.6.7.1 The system shall communicate via USB 2.0 using the drivers installed on
the user’s computer.
3.6.7.5 The system shall indicate when the nTravel device is unrecognizable by
the user’s computer.
3.8.7.1 The system shall query the user regarding desire to synchronize image and
note files.
3.8.7.2 The system shall transfer image and note files from the nTravel to the
user’s computer using USB 2.0.
3.8.8 Preconditions – User has installed nTravel software on user’s computer.
3.8.9 Post conditions – User’s computer has updated files stored.
3.8.10 Nonfunctional requirements –
3.8.10.1 Performance Requirements-
3.8.10.1.1 Maximum allowed execution time for file synchronization is 1
second per 20 MB of files being transferred.
3.8.10.2 Safety Requirements- None.
3.8.10.3 Security Requirements- None.
3.8.10.4 Software Quality Requirements- None.
3.8.11 Notes/Issues – None.
3.8.12 Special Requirements – None.
Software
Requirements Specification for nTravel Page 24
4. External Interface Requirements
4.1 User Interfaces
The nTravel’s user interface has been specifically designed with their customers in
mind, giving them convenience while they travel. The nTravel makes sure at every point, that the
customer spends most of the time using the device rather then figuring out how to use it.
The home screen offers a menu with a list of functions that the device performs. The
user can select one of the options on the menu, and is taken to the respective screen. Every
screen displays the menu on the bottom. The user can click on any one of the options and is
taken to the screen of their choice. In addition, clicking on the power button displays the home
screen with the menu options.
The device offers easy scroll options to navigate the screens efficiently. To scroll
down any screen, simply touch the scroll bar on the screen, and roll down. If the user does not
know how to use any functionality or has any queries, the help option can be used. The help
screen contains a text field to enter search terms. A list of search results pertaining to the query is
displayed.
4.2 Hardware Interfaces
The nTravel contains a USB 2.0 port to connect to the user computer and download
software updates. It can also be used to transfer images from the device to the user’s computer
and vice versa. The device also contains a SD card slot for extra storage.
Software
Requirements Specification for nTravel Page 25
4.3 Software Interfaces
The nTravel software runs on MontaVista MobiLinux v5.0 embedded operating
system. The OS is altered specifically to the meet needs of nTravel. The nTravel features
revolutionary touch screen software that makes it convenient to use. The nTravel also offers a
touch screen QWERTY keyboard that helps users type text to translate into different languages.
The nTravel uses synchronization software that is compatible with Windows, Linux & Mac
operating systems. The device contains an in-built language database containing image, text and
audio files. The database can be updated with additional languages by downloading them on the
user’s computer and synchronizing them to the device.
4.4 Communications Interfaces
User’s can connect their device to their computer’s using a USB 2.0 cable. Once
connected to the computer, user’s can easily transfer images, text files, and the other files
between the device and computer. User’s can easily update their nTravel device software when
connected to the computer. User’s can download updates from nTravel’s website at anytime
using secured login and password provided to them. Whenever the user connects the device to
the computer, the device updates itself. The update should not take any longer then 10 minutes.
5 Other Nonfunctional Requirements
For information regarding nonfunctional requirements, refer to section 3: System
Features. Each feature has its requirements listed alongside the feature information. There are no
additional Non Functional Requirements.
Software
Requirements Specification for nTravel Page 26
6 Other Requirements
For information regarding functional requirements, refer to section 3: System Features.
Each feature has its requirements listed alongside the feature information. Special requirements
for each system feature are also mention in section 3. There are no additional Functional
requirements.
7 System Requirements Chart [[Fleck – Description column
should be wider and some other columns narrower to make
it look better]]
ID
Priority
Type
NF=Nonfunctional
F=Functional
Source
Used in
Use
Case(s)
Description
3.1.7.1
Medium
F
Customer-
John Doe
U1
The system shall
provide the option
to take a picture.
3.1.7.2
Medium
F
Customer-
John Doe
U1
The system shall
display the
currently viewed
image.
3.1.7.3
Medium
F
Customer-
John Doe
U1
The system shall
store the image in
temporary
memory.
3.1.7.4
Medium
F
Customer-
John Doe
U1
The system shall
indicate a need for
repair if broken.
3.2.7.1
Low
F
Customer-
John Doe
U2
The system shall
ask the user
whether to save a
picture.
3.2.7.2
Low
F
Customer-
John Doe
U2
The system shall
store the picture in
internal memory.
3.2.7.3
Low
F
Customer-
John Doe
U2
The system shall
notify the user if
insufficient
Software
Requirements Specification for nTravel Page 27
memory to store
the picture
remains.
3.3.7.1
High
F
Customer-
John Doe
U3
The system shall
receive text input
from the user.
3.3.7.2
High
F
Customer-
John Doe
U3
The system shall
identify the
language of the
text entered.
3.3.7.3
High
F
Customer-
John Doe
U3, U4,
U5
The system shall
compare the input
to the database.
3.3.7.4
High
F
Customer-
John Doe
U3
The system shall
translate the text
into the desired
language.
3.3.7.5
High
F
Customer-
John Doe
U3
The system shall
output the
translated text.
3.3.7.6
High
F
Customer-
John Doe
U3, U4,
U5
The system shall
indicate when it
cannot translate
the input.
3.3.7.7
High
F
Customer-
John Doe
U3, U4
The system shall
indicate when the
text’s language
cannot be
identified.
3.4.7.1
High
F
Customer-
John Doe
U4
The system shall
record speech
using the
microphone.
3.4.7.2
High
F
Customer-
John Doe
U4
The system shall
identify the
language of the
spoken words.
3.4.7.3
High
F
Customer-
John Doe
U4
The system shall
compare the input
to the database.
3.4.7.4
High
F
Customer-
John Doe
U4
The system shall
output the spoken
language as text
3.4.7.5
High
F
Customer-
John Doe
U4
The system shall
output the spoken
language as
Software
Requirements Specification for nTravel Page 28
speech.
3.5.7.1
Medium
F
Customer-
John Doe
U5
The system shall
identify a sign in
an existing picture.
3.5.7.2
Medium
F
Customer-
John Doe
U5
The system shall
identify the
language in a sign.
3.5.7.3
Medium
F
Customer-
John Doe
U5
The system shall
compare the sign
to signs that exist
in the database.
3.5.7.4
Medium
F
Customer-
John Doe
U5
The system shall
translate any text
on the sign.
3.5.7.5
Medium
F
Customer-
John Doe
U5
The system shall
output the sign
information as
text.
3.5.7.6
Medium
F
Customer-
John Doe
U5
The system shall
output the sign
information
as speech.
3.5.7.7
Medium
F
Customer-
John Doe
U5
The system shall
indicate when the
sign’s language
cannot be
recognized.
3.6.7.1
Low
F
Development
Team
U6, U8
The system shall
communicate via
USB 2.0 using the
drivers installed on
the user’s
computer.
3.6.7.2
Low
F
Development
Team
U6
The system shall
relay information
regarding current
software version
information such
that it can be
determined
whether a software
update is required.
3.6.7.3
Low
F
Development
Team
U6
The system shall
allow software
updates to be
transferred to it via
Software
Requirements Specification for nTravel Page 29
USB 2.0 from the
user’s computer.
3.6.7.4
Low
F
Development
Team
U6
The system shall
indicate when no
software updates
are available.
3.6.7.5
Low
F
Development
Team
U6, U8
The system shall
indicate when the
nTravel device is
unrecognizable by
the user’s
computer.
3.7.7.1
High
F
Customer-
John Doe
U7
The system shall
allow the user to
select input
language.
3.7.7.2
High
F
Customer-
John Doe
U7
The system shall
allow the user to
select output
language.
3.7.7.3
High
F
Customer-
John Doe
U7
The system shall
check the updated
database to find
required language.
3.7.7.4
High
F
Customer-
John Doe
U7
The system shall
get ready to
translate via
chosen output.
3.7.7.5
High
F
Customer-
John Doe
U7
The system shall
indicate when a
database file is
corrupt and cannot
be read.
3.8.7.1
Low
F
Customer-
John Doe
U8
The system shall
query the user
regarding desire to
synchronize image
and note files.
3.8.7.2
Low
F
Customer-
John Doe
U8
The system shall
transfer image and
note files from the
nTravel to the
user’s computer
using USB 2.0.
3.1.10.1.1
Medium
NF
Development
Team
U1
The system shall
Software
Requirements Specification for nTravel Page 30
3.2.10.1.1
Medium
NF
Development
Team
U2
Maximum allowed
execution time for
PictureSaver is 3
seconds, starting
when user presses
the save button
and ending when
the picture has
been saved in
memory and the
user has been
notified of this
event.
3.3.10.1.1
High
NF
Development
Team
U3
Maximum allowed
execution time for
Textlator is 5
seconds for every
30 words being
processed.
3.4.10.1.1
High
NF
Development
Team
U4
Maximum allowed
execution time for
Speechlator is 5
seconds for every
30 words being
processed.
3.5.10.1.1
High
NF
Development
Team
U5
Maximum allowed
execution time for
Signlator is 5
seconds, starting
when the user
requests a sign
translation and
ending when the
audio/visual output
has been
transmitted.
3.6.10.1.1
Low
NF
Development
Team
U6
Maximum time to
perform data
synchronization is
10 minutes.
3.6.10.3.1
High
NF
Development
Team
U6
Security protocols
must be
implemented to
ensure that
malicious
programming
Software
Requirements Specification for nTravel Page 31
cannot pass from
the computer to
the device.
3.7.10.1.1
High
NF
Development
Team
U7
Maximum allowed
execution time for
a language
database change is
20 seconds.
3.8.10.1.1
Medium
NF
Development
Team
U8
Maximum allowed
execution time for
file
synchronization is
1 second per 20
MB of files being
transferred.
Software
Requirements Specification for nTravel Page 32
Appendix A: Glossary
SD – Secure Digital. A widely available format for flash memory cards.
USB – Universal Serial Bus. A serial bus standard that is used in many computer peripherals and
other electronic devices
.
