Performed by : Micha Rave Guy Gabso Supervisor: Reuven Nisser המעבדה למערכות ספרתיות מהירות High speed digital systems laboratory הטכניון - מכון

Performed by: Micha RaveGuy Gabso

Supervisor: Reuven Nisser

High speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

הטכניון - מכון טכנולוגי לישראל

הפקולטה להנדסת חשמל

Technion - Israel institute of technologydepartment of Electrical Engineering

Barcode Reader(PC)

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Project Goals:Project Goals:


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Translate barcode labels into voiceTranslate barcode labels into voiceEquipped with:

1. PC - MFC

2. Scan engine SE2223

3. Board

4. Barcode labels

5. Sound card & speaker

Which enables:

Translate digital information stored on barcode labels into voice.

Software EnvironmentSoftware EnvironmentHigh speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

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The platform used for the project developing is Microsoft Visual C++.

The MFC IDE is an Object oriented, MT, WIN32 based environment. The code written implements the following software tasks:

1. Manages the communication with the scan engine using the RS232. The protocol used is the one specified by Symbol’s simple interface documentation.

Software Env, continue..Software Env, continue..High speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

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2. User Interface.

3. Text to Voice Synthesis.

Block DiagramBlock DiagramHigh speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

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Comm Main

CSerial

IOComm

IOMain UI

Voice

Synthesis


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Serial communicationSerial communication

SE2223 – Scan Engine overviewSE2223 – Scan Engine overview

• 2D Scanner• Baud Rate : 9600 Baud• Data Bits : 8 bits• Hardware Handshaking• Software Handshaking - on• Half-duplex communication protocol


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SE2223 – Hardware SignalsSE2223 – Hardware Signals

HostDecoder

TXD

Host TXDRXD

Host RXD

RTS

Host RTS

Host CTS

CTS

• Synchronic Communication• Host/TXD : Data Transmit output• Host/RXD : Data Receive input• Host/RTS : Request To Send • Host/CTS : Clear To Send




Block DiagramBlock Diagram



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SE2223 - ProtocolSE2223 - ProtocolRXD

TXD

CTS

RTS

Basic Host Initiated Transaction



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SE2223 – SSI CommandsSE2223 – SSI Commands

Host• BEEP, FLUSH_QUEUE, PARAM_SEND, SLEEP, START_SESSION.

Case BEEPpData[0] = 05h; // LengthpData[1] = E6h; // OpcodepData[2] = 04h; // Message source – Decoder/HostpData[3] = 00h; // StatuspData[4] = 00h; // Beep Code

pData[5] = FFh;// MSB Checksum – 2’s complementpData[6] = 11h; // LSB Checksum

Decoder• CMD_ACK, CMD_NAK, DECODE_DATA.

1. Decode opcode2. If ACK/NAK - end3. If Packet : check STATUS for multipacket (over 256 byte)4. Transfer ASCII data to relevant buffer

Serial communicationSerial communicationHigh speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

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Data streams from the serial port in packeted ASCII format.

The code must strip the relevant data and produce synthesized voice.

LengthOpMessage Length

StatusDataChecksum

F3h00h…

Voice SynthesisVoice Synthesis


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The Delay Problem

ScanEngine input rate: Arrival Time of two chars:

9600[bps]/1000 2 [ms]

Play Rate: Duration of one syllable:

(1800 WORD)/8000 225 [ms]

Decoding the ASCII streamDecoding the ASCII streamHigh speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

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• The program reads the stream, dismantles it to basic syllables and load to memory the corresponding PCM resource according to a predefined table:

• In such a case the ASCII sequences:

“^a” will translate to - \ָא and

“ba” will translate to – ַּ̂ב

Vocalt filePhonateHebrew

a^ָא

bbב דגושה

fvב לָא דגושה

Second letter in filename aaLike but

Second letter in filename e

eLike bed

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Decoding the ASCII stream Decoding the ASCII stream (cont)(cont)


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• The playing of consecutive syllables will resemble a word.

• In which case the previous example will sound like ABA (ָאבָא).

Playing The Voice filesPlaying The Voice filesHigh speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

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• In the beginning of the program all the voice file representing the syllables are preloaded into the main memory and held in an array.

• With each syllable to be played, the requested file is placed in a buffer, manipulated as necessary and played.

• In order to avoid delays, the program manages two buffers. While one buffer s being played the other buffer is filled with the next data to be vocalized.

Playing The Voice files - FlowPlaying The Voice files - FlowHigh speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

Start

Init sound card and Preload handles of all

voice files

Sending the buff to the sound card

Decode the ASCII sequence

Prepare the next buff to play

Check for “STOP”

STOP pressed

Wait for Message

End of message?

No

Yes

Voice files interpolatingVoice files interpolatingHigh speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

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• The voice files are 16 bit, mono 8KHz sample rate raw PCM.

• In order to achieve a “smooth” transition between the syllables some sort of actions are to be taken to blend each two consecutive syllables.

• We choose to do this by fading out one syllable while fading in the next one. Other methods include much more sophisticated forms of mathematical manipulation.

Bar Code LabelsBar Code LabelsHigh speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

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The PDF417 barcode labels we used where produced using an applet by ID Automation at http://www.idautomation.com/java/pdf417servlet.html

To encode for example the line “פרויקט קורָא בר קוד” we encoded the ASCII stream “proyectkorebarkod” and got the result:

http://www.idautomation.com/java/pdf417servlet.html



Major debug issuesMajor debug issuesHigh speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

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• Dealing with the RS232 is a problem due to the asynchronous nature of the data flow and the design of the MT code.

• Voice Synthesis is far from resembling human voice.

• Delayed parts delivery from manufacturer.

Definition vs. implementationDefinition vs. implementationHigh speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

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All Pre-Definition were fully implemented:GoalStatusRemarks

Communicating with the Scan Engine

Major delays !!

Voice SynthesisNeed improvement

GUI

Integration

Creation of barcode labels

Direction of use:Direction of use:High speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

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User Interface

• Pressing “Scan” (or ‘S’) will result in scanning a barcode label and playing the data coded into it.

• Pressing “Stop” (or ‘T’) will stop the playing of message currently in progress.

• Pressing “Play Again”” (or ‘A’) will play the last message from the beginning.

Direction of use, continue..Direction of use, continue..High speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

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• Before pressing play a label must be placed in front of the barcode so it can be scanned.

• Barcode labels can be printed in the following website:


Future planningFuture planningHigh speed digital systems laboratoryהמעבדה למערכות ספרתיות מהירות

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• Design and implement a better phoneme integration, considering a handling in the frequency domain.

• Build a tool for creating a PDF417 label so that operator need not have a knowledge of the phonemes “special” structure.


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מעבדה ספרתית

טכניון ישרָאל

פרויקט קורָא ברקוד

Documents

Performed by : Micha Rave Guy Gabso Supervisor: Reuven Nisser המעבדה למערכות ספרתיות מהירות High speed digital systems laboratory הטכניון - מכון