DSP56307SCDEMOUM [ETC]

DSP56307 Speech Coding Demonstration User＇s Guide ; DSP56307语音编码演示用户指南\n


型号：	DSP56307SCDEMOUM
厂家：	ETC
描述：	DSP56307 Speech Coding Demonstration User＇s Guide DSP56307语音编码演示用户指南\n
文件：	总18页 (文件大小：299K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Signals & Software Ltd.

Speech Coding Demonstration for the

Motorola DSP56307

User’s Guide

Revision 1.0

1 August 1998

Page 2

DSP56307 Speech Coding Demonstration User Guide

TABLE OF CONTENTS

1. INTRODUCTION ......................................................................................................................................................2

2. SETUP OF THE SPEECH CODER AND DTMF DEMO.........................................................................................2

2.1 Overview ...............................................................................................................................................................2

2.2 Equipment .............................................................................................................................................................2

2.3 Installation procedure............................................................................................................................................2

2.3.1 Preparing the DSP56307EVM board .............................................................................................................3

2.3.2 Connecting the DSP56307EVM ....................................................................................................................3

2.3.2.1 Connecting the Power Supply.................................................................................................................3

2.3.2.2 Connecting to the RS23C Port on the PC ...............................................................................................4

2.3.2.3 Connecting the Speakers.........................................................................................................................5

2.3.2.4 Connecting to the Audio Source .............................................................................................................5

2.3.3 Installing the Demonstration Software...........................................................................................................6

2.3.4 Testing the Installation ...................................................................................................................................6

3. USING THE DEMONSTRATION SOFTWARE.......................................................................................................8

3.1 Overview ...............................................................................................................................................................8

3.2 A look around the demo ........................................................................................................................................8

3.3 Controlling the speech coders ...............................................................................................................................9

3.3.1 G.711...............................................................................................................................................................9

3.3.2 G.726 ............................................................................................................................................................10

3.3.3 Full Rate GSM .............................................................................................................................................10

3.4 Controlling the DTMF Receiver and Generator..................................................................................................11

Appendix A Shortcut keys to control the demonstration..............................................................................................13

Appendix B Command line switches............................................................................................................................13

Appendix C Maximum input and output signal levels .................................................................................................13

Appendix D Technical Specifications...........................................................................................................................14

Appendix E Default Jumper Settings............................................................................................................................16

TABLE OF FIGURES

Figure 2-1 DSP56307EVM Demonstration Jumper Settings ........................................................................................3

Figure 2-2 Connecting the DSP56307EVM to the Power Supply .................................................................................4

Figure 2-3 Connecting the DSP56307EVM to the PC (RS232 cable)............................................................................4

Figure 2-4 Connecting the DSP56307EVM to the Speakers ..........................................................................................5

Figure 2-5 Connecting the DSP56307EVM to the Audio Source ...................................................................................5

Figure 2-6 Screen shot from demo during initialisation................................................................................................7

Figure 2-7 Demonstration main screen ..........................................................................................................................7

Figure 3-1 Main screen showing different sections .......................................................................................................8

Figure 3-2 Options for G.711 ..........................................................................................................................................9

Figure 3-3 Options for G.726........................................................................................................................................10

Figure 3-4 Options for Full Rate GSM.........................................................................................................................11

Figure 3-5 DTMF Generator and Receiver ..................................................................................................................11

Figure E-1 DSP56307EVM Default Jumper Settings...................................................................................................16

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 3

DSP56307 Speech Coding Demonstration User Guide

INTRODUCTION

This demonstration package is designed to allow you to evaluate the quality of some of the industry standard speech

coders developed and produced by Motorola and Signals and Software Ltd. on Motorola’s newest DSP the

DSP56307. In addition, this demo contains the Dual Tone Multi-Frequency (DTMF) code for receiving and transmit-

ting tones in an alpha numeric keypad. With 64K words of internal memory, the DSP56307 does not require any

external memory to run this entire suite of software.

The demonstration software requires the DSP56307EVM Evaluation Module board (Order # DSP56307EVM), a per-

sonal computer running Windows 95™ or MSDOS operating system, an audio source (CD or tape cassette), active

speakers, a power supply and the appropriate cables to connect them all together.

This document should provide you with all the information you need to set up and effectively use the demonstration

package. Should you have any further questions please contact your Motorola sales representative or Signals and

Software at the address below.

SETUP OF THE SPEECH CODER AND DTMF DEMO

2.1

Overview

This section provides a summary of the equipment you will need to run the audio processing demonstration to evalu-

ate the speech coder and DTMF software and a detailed description of how to set up the demonstration. This informa-

tion is also found in the CD-ROM: Using the Motorola DSP56307 (Order # CDWISD/D), in a step-by-step tutorial.

2.2

Equipment

•

Signals and Software’s 56307 Audio Processing Demonstration Installation Program (INSTALL.EXE found on

the CD-ROM: Using the Motorola DSP56307)

•

One DSP56307EVM

One 9V AC or DC power supplies with 2.1mm power connector capable of supplying at least 500mA

One RS-232 interface cable (DB9 male to DB9 female) straight through, no twists

One set of active speakers

An audio source, either a CD ROM drive in the PC or an audio cassette and audio media supplying speech data

such as speaking books (not music)

•

Interface cables to connect the EVM to the audio source and speakers

One PC, 486 or higher running MS-DOS or Windows 95 with at least one free RS-232 serial port and 135Kbytes

of free disk space and 450K of conventional memory free and a mouse

2.3

Installation procedure

Installation requires four basic steps:

1. Preparing the DSP56307EVM board

2. Connecting the DSP56307EVM board to the power supply, PC (RS232 port), speakers, and audio source

3. Installing the software

4. Testing the installation

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 4

DSP56307 Speech Coding Demonstration User Guide

2.3.1 Preparing the DSP56307EVM board

In order to run the demonstration software, certain jumpers must be changed and checked on the DSP56307EVM

board. Locate the DSP56307EVM board jumper blocks illustrated in Figure 2-1 and make sure that the jumpers are

connected as shown. The only jumpers that should require changing from the default settings are located on J1, J9 and

J11 but all jumpers should be checked for proper operation. For a detailed description of what these jumpers do please

refer to the DSP56307EVM User’s Manual. To reset the jumpers back to the default setting, refer to Appendix E.

J10

MODE SELECT

J11

+3.3V

+2.5V

DEBUG ENABLE

SW2

SW3

RS232

LED3

SW1

J11

MC74HCT04

DSP56002

AT29LV010A

Flash

RESET

DSP56307

MC34164

J10

ESSI1

ESSI0

MAX212

P6 LINE OUT

LED2

JTAG/OnCE

DEBUG

LM4880

MC33269

DSP56307EVM

SERIAL NO.

POWER

CS4218

LINE IN

LED1

J2, J3, J6 - HEADER CONNECTOR ONLY, NO JUMPERS

J4 J5

ESSI1

ESSI0

SAMPLE RATE SELECT

Figure 2-1 DSP56307EVM Demonstration Jumper Settings

Connecting the DSP56307EVM

2.3.2

2.3.2.1

Connecting the Power Supply

Make sure that the external 9 V power supply does not have power supplied to it. Connect the 2.1mm output plug

into P3 on the DSP56307EVM as shown in Figure 2-2. Note the power supply can be either AC or DC and the

polarity is not important. Please ensure the supply is capable of supplying at least 500mA or the power supply may

overheat.

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 5

DSP56307 Speech Coding Demonstration User Guide

RS232

J11

DSP56002

Flash

RESET

DSP56307

J10

LINE OUT

DEBUG

To Power Supply

DSP56307EVM

SERIAL NO.

LINE IN

Figure 2-2 Connecting the DSP56307EVM to the Power Supply

Connecting to the RS23C Port on the PC

2.3.2.2

Connect one end of the RS232 interface cable to the free RS-232 socket on your PC and connect the other end to P1

on the DSP56307EVM as shown in Figure 2-3. Note the important connections here are Pin 2 - Rx, Pin 3 - Tx, Pin 4

- DTR and Pin 5 - GND. The other connections on the 9 way connector are unused. Also it is not necessary to insert

any twists in the cable, that is Pin 2 on the plug goes to Pin 2 on the socket, Pin 3 to Pin 3 etc.

To RS232 Port

RS232

J11

DSP56002

Flash

RESET

DSP56307

J10

LINE OUT

DEBUG

DSP56307EVM

SERIAL NO.

LINE IN

Figure 2-3 Connecting the DSP56307EVM to the PC (RS232 cable)

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 6

DSP56307 Speech Coding Demonstration User Guide

2.3.2.3

Connecting the Speakers

The active speakers should be connected to the connector labelled P5 Headphone OUT on the DSP56307EVM as

shown in Figure 2-4. Alternatively, if the speakers are connected to an separate audio system with an internal ampli-

fier the speaker system can be connected to the P6 LINE OUT connector.

RS232

J11

DSP56002

J7 J10

Flash

RESET

DSP56307

LINE OUT

To Speakers

DEBUG

DSP56307EVM

SERIAL NO.

LINE IN

Figure 2-4 Connecting the DSP56307EVM to the Speakers

Connecting to the Audio Source

2.3.2.4

The DSP56307EVM should be connected to the audio source via a 3.5mm stereo plug, which should be plugged into

the socket label P4 IN on the DSP56307EVM. If the PC has a built in CDROM player with an external headphone

connector, this should form an ideal source. If not, a separate audio cassette player can be used as the audio source

with the 3.5mm cable connected between the headphone connector on the cassette player and P4 IN on the

DSP56307EVM as shown in Figure 2-5.

RS232

J11

DSP56002

Flash

RESET

DSP56307

J10

LINE OUT

DEBUG

DSP56307EVM

SERIAL NO.

LINE IN

To Audio Source

Figure 2-5 Connecting the DSP56307EVM to the Audio Source

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 7

DSP56307 Speech Coding Demonstration User Guide

Once all connections are made to the board power can be applied to the board. Apply power to the power supply. The

green Power LED (LED1) will light when power is correctly applied. Press the RESET switch (SW1) before down-

loading the demonstration software.

2.3.3

Installing the Demonstration Software

The Signals and Software (SASL) demo should have been installed on your hard disk as part of the setup and instal-

lation of the Using the DSP56307 training CD-ROM. At one point during the installation procedure you should have

received the following message with an OK prompt: ‘InstallShield will now launch the installer for the SASL Demo’.

To verify that it has been installed properly, check your hard disk for a directory called ‘M307DEMO’. There should

be two files in this directory: M307DEMO.EXE and REGISTER.TXT.

Alternatively, the demo software can be installed independently of the installation of the DSP56307 training pro-

gram.

1. Insert the Motorola Using the DSP56307 CD-ROM into your CD-ROM drive.

2. If you are using Windows 95 run the install program by going to the Windows Start menu and select the Run

command. If you are using Windows 3.1, select the Run command from the File menu in Program Manager.

Either way, type D:\BIN\INSTALL.EXE. If D is not the drive letter of your CD-ROM then substitute your CD-

ROM drive letter. The install program will then bring up a software licence agreement. Please read this care-

fully as it is a legally binding agreement between yourself and Signals and Software. If you do not agree with the

terms of this agreement, please do not continue with the installation and return the disk. If you do agree with the

licence then enter ‘Y’ as prompted and the installation will continue. By default the files will be installed on

your hard disk in the directory C:\M307DEMO, if you want them installed elsewhere then enter the destination

directory at the prompt. The only files that will be installed on you hard disk are M307DEMO.EXE and REG-

ISTER.TXT. Please print out REGISTER.TXT, complete it and fax it back to Signals & Software. Support for

the demonstration will only be provided if you have registered.

3. This completes the software installation procedure. Please note that the demonstration software is time limited

and will run for 30 days after installation or for a total of 16 hours runtime. After this time the software will be

disabled and it will be necessary to reinstall it, should you wish to continue evaluating it.

2.3.4

Testing the Installation

By now you should have the EVM connected to an audio source, speakers, a PC and power.

1. If your PC is running Windows 3.1 then you must quit back to DOS (the demo software will not work correctly

under Windows 3.1). If the PC is running Windows 95 then open up a full screen DOS box.

2. Change directory to where you installed the software, for example CD C:\M307DEMO.

3. Run the software by typing M307DEMO -Cn. The -C option allows you to select COM 1 or COM 2 port which

the EVM is connected to, if you do not include the -C option the code will default to COM 1 port.

4. If all is well, then the demo will initialise the EVM. Figure 2-6 shows what you should see on the screen.

Depending on the speed of the PC this may take some time, however the percentage indicators should increment

steadily if they get stuck for more than a few seconds then there is a problem. If the code immediately returns

with Runtime Error 203 or the message Program too big to fit in memory this is most likely because there is

insufficient free conventional memory for the program to run. The software requires approximately 450K of

conventional memory. You can use the mem /p/c command to check the available memory, more memory can

be made available by removing some drivers from your CONFIG.SYS and AUTOEXEC.BAT files, please

refer to the documentation that came with your operating system for details of how to do this. If the code returns

with Error in interface to EVM then you should check that power is applied to the EVM, the RS-232 cable is

correctly connected to the EVM and PC and that you selected the correct COM port. If after verifying all these

there is still a problem try using the -B option to select a slower baud rate than the default 115200. If problems

persist try powering down the PC and the EVM and then retry. If it still does not work try a different PC, EVM,

and RS-232 lead. If your problems still persist contact your Motorola sales representative or Signals and Soft-

ware.

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 8

DSP56307 Speech Coding Demonstration User Guide

DMF563xx Speech Coding Demonstration

Version 4.01 3 August 1998

DSPinterface linked

-h for command line options

Mouse driver found

Driver version

: 1.0 14 July 1998

Booting 563xx with : @BOOTLOAD [100%]

Bootloader Version : 1.00

Device

: DSP56307 Ver 000

Downloading 563xx with @M307DEMO [ 100%]

Figure 2-6 Screen shot from demo during initialisation

5. If the initialisation was successful then the main screen of the demo, shown in Figure 2-7, will come up after the

download is complete. When the demo initially starts the speech coder selected is loopback (i.e. no coding) at 8

kHz sampling. DTMF is always enabled.

Figure 2-7 Demonstration main screen

6. Press one of the DTMF keypad keys using the mouse or numeric keypad and confirm you can hear the tone. If

not check your speaker volume settings and connections.

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 9

DSP56307 Speech Coding Demonstration User Guide

7. Start your audio source playing and confirm that you can hear it out of the speaker. If not check your input

source volume and connections.

USING THE DEMONSTRATION SOFTWARE

3.1

Overview

In this section you will learn about all the features of the audio processing demonstration and how to effectively use

the demonstration to evaluate the DTMF and the quality of various speech coding algorithms and the capabilities of

the Motorola DSP56307.

3.2

A look around the demo

Figure 3-1 shows the main screen of the demonstration. The screen is split into four distinct areas, as indicated in the

diagram.

Palette of available

speech coders area

Speech coder

control area

DTMF control area

Global control buttons

Figure 3-1 Main screen showing different sections

On the left hand side of the screen is a palette of available speech coders. In this version of the demonstration the

available coders are loopback (i.e. no coding), G711 (both A-law and µ-law), G726 and GSM Full Rate. Other speech

coders are available in different versions of the demo from Signals & Software. The centre panel is the control area

for the speech coders. This allows you to select different options for the current speech coder, as well as obtaining

information about the current speech coder. At the top of the panel is a MIPS display, which represents the real time

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 10

DSP56307 Speech Coding Demonstration User Guide

processor loading. The MIPS figure will change depending on which coder is running and also depending on the

level of speech activity. The right hand panel allows control of the DTMF. At the centre bottom of the screen is a set

of buttons that control the overall operation of the demo. These buttons will be described in detail here. The rest of

the functionality is described in sections 3.3 and 3.4.

The MUTE and DISABLE buttons are activated by clicking on the appropriate button and dragging onto either the

speech coder control area before letting go. When mute or disable are active then a label on the screen indicates this,

also when disable is active the MIPS panel is blanked. Both these functions are simple toggles, and can be de-acti-

vated by re-selecting them. The speech coder MUTE acts on the output of the speech coder, so that the speech coder

is still working on valid data, and hence the MIPS figures remain realistic. Disabling the speech coder is the same as

selecting 8kHz loopback.

If the CYCLE button is dragged onto the speech coder area, then the program will cycle through all the available

coders, changing once every 5 seconds. The SINGLE button reverts operation back to normal mode.

The HELP button gives a brief reminder on how to use the demo. The ABOUT button shows the version number for

the software, which you will need should you require any help, as well as contact address for Signals And Software.

The EXIT button can be used to quit the demo program (Esc also leaves the demo).

If your PC has a compatible CD-ROM and driver installed the demo can control the CD player. If you click once on

the Motorola logo then if the software has detected the CD-ROM the panel will change to give control of the CD

player. This can be useful for a speech coder only based demo where you may be using the CD-ROM as an audio

source.

3.3

Controlling the speech coders

An individual speech coder is selected by clicking on one of the icons on the left hand side of the screen and dragging

it onto the speech coder control area before letting go. Once you release the icon, you will notice the banner at the top

change to reflect the new coder, and after a second or so the MIPS figure will update to reflect the new loading. Any

coder specific controls will appear beneath the banner. Pressing the SPEC and INFO buttons at the bottom of the

panel will bring up more information about the currently running coder. After pressing these buttons they must be

pressed again to return to the main screen.

3.3.1

G.711

G.711 is the world wide standard speech coder used in digital telephone systems. There are two variants of G.711

termed A-law and µ-law, both of which can be selected in this demo, as shown in Figure 3-2.

Figure 3-2 Options for G.711

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

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Page 11

DSP56307 Speech Coding Demonstration User Guide

There is no noticeable difference in quality between the two. The basic data rate for G.711 is 64kb/s, though it is

common to bit steal one or two bits, reducing the data rate to 56kb/s and 48kb/s respectively, while introducing some

quantisation noise.

3.3.2

G.726

G.726 is based on the adaptive differential pulse code modulation (ADPCM) algorithm. This operates at 4 bit rates

(40 kb/s, 32 kb/s, 24 kb/s and 16 kb/s) as shown in Figure 3-3. G.726 is used as the reference against which all other

speech coders are measured.

Figure 3-3 Options for G.726

The performance of G.726 for a single encode/decode is judged to be as follows. At 40 kb/s G.726 will pass 9.6 kb/s

modem signals, and provides equivalent quality to G.711. At 32 kb/s to quality is identical to G.711. At 24 kb/s there

is some noticeable degradation from G.711. At 16 kb/s there is considerable degradation, but the speech is still intel-

ligible.

Because G.726 is a waveform based coder then it works equally well with all types of signals, including music. It

also has the benefit of having an effective coding delay of 0.

3.3.2 Full Rate GSM

The full rate GSM speech coder uses a Regular Pulse Excitation with Long-Term Prediction (RPE-LTP) algorithm.

This is a member of one of a family of linear predictive speech coders. This codes narrowband speech to 13 kb/s, at

a quality that is somewhat degraded compared to 64 kb/s G.711. Full rate GSM is used as the standard speech coder

in the European Digital Mobile phone system.

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 12

DSP56307 Speech Coding Demonstration User Guide

This GSM speech coder also includes a voice activity detector (VAD) and comfort noise generator, such that when

there is no speech present power and bandwidth can be saved by not transmitting any information. The demo allows

you to enable and disable this feature so you can hear the effects of it working as illustrated in Figure 3-4.

Figure 3-4 Options for Full Rate GSM

3.4

Controlling the DTMF Receiver and Generator

The right hand portion of the screen shows the DTMF generator keypad and the receiver display, as shown in Figure

3-5.

Figure 3-5 DTMF Generator and Receiver

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

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E-mail:

Page 13

DSP56307 Speech Coding Demonstration User Guide

Using the mouse to press a digit on the DTMF keypad, will generate a DTMF tone, alternatively you can use the

number keys and the keys ‘A’, ‘B’, ‘C’, ‘D’ ‘*’ and ‘#’. Note the keys are case sensitive. When the receiver detects

a digit it will be displayed in the receiver window. The window is automatically cleared after a few seconds of inac-

tivity.

The DTMF Receiver is running all the time, and is positioned at the output of the speech decoder. That is the tones

are being detected after being coded and decoded. Because the receiver is running all the time, its performance in the

presence in speech is being tested continuously. Whatever signal is fed into the input of the EVM will be fed into the

DTMF receiver. Hopefully you will not see the receiver falsely detect any digits in the presence of speech. If you fed

DTMF tones into the input of the EVM the receiver should detect them. Alternately you can use the built in DTMF

generator, which is positioned at the input to the speech encoder, i.e. the tones are fed through the speech encoder/

decoder path.

Please note that if you generate DTMF digits while speech is being passed though the system, the receiver may not

detect the digits. This is not a fault, DTMF digits in a real system should not occur at the same time as speech. In

order to ensure the receiver does not detect speech as erroneous digits, it is designed not to detect digits during

speech, but should detect digits in the presence of low level noise.

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 14

DSP56307 Speech Coding Demonstration User Guide

Appendix A

Shortcut keys to control the demonstration

Global controls

Display ABOUT information

Exit the program

esc

Display HELP information

Exit the program

Speech coder controls

Select Loopback at 8 kHz

Select G.711 A-law

Select G.726 at 32 kb/s

Select Full Rate GSM with VAD enabled

Disable the speech coder

Mute the speech coder

DTMF controls

0-9

A-D

*,#

Generate DTMF digit 0-9

Generate DTMF digit A-D

Generate DTMF digit * and #

Display information for DTMF receiver

Display specifications for DTMF receiver

Appendix B

Command line switches

-A

start CD playing immediately

-Bn

select baud rate n, n=1200,2400,4800,9600,19200,28800,38400,57600,115200

[default = 115200]

-Cn

-H

-V

-X

-Z

select com port n, n=1..4

this screen

full verify during download

prevent normal exit

[default = 1]

[default disabled]

disable interface to DSP, demo mode only

Appendix C

Maximum input and output signal levels

Maximum input voltage at P3 IN

Approximate input impedance

± 2 V (± 0.2 V with mic levels set)

15 kΩ

± 2.8 V

10 kΩ

Maximum output voltage at P5 OUT

Minimum external load impedance

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 15

DSP56307 Speech Coding Demonstration User Guide

Appendix D

Technical Specifications

Speech Coders

G.711

64 kb/s

300 - 3400 Hz

8000 Hz

G.726

40, 32, 24, 16 kb/s

300 - 3400 Hz

8000 Hz

GSM Full Rate

13 kb/s

300 - 3400 Hz

8000 Hz

Data Rate

Audio Bandwidth

Sampling Rate

Processor Loading

Function

Program memory

X Data Memory

Y Data Memory

Processing

Code

Tables

Variables Tables Variables Tables Load (MIPS)

G.711 Encoder A-law

G.711 Encoder µ-law

G.711 Decoder A-law

G.711 Decoder µ-law

G.726 Encoder

G.726 Decoder

GSM Full Rate Encoder

GSM Full Rate Decoder

584

678

128

206

166

101

206

158

0.45

0.24

5.7

6.5

2.34n

0.63n

1991

786

440+341n

440+113n

74+103n

74+14n

n = Number of channels

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 16

DSP56307 Speech Coding Demonstration User Guide

DTMF

The DTMF receiver is highly configurable allowing it to be modified to meet different requirements. In its default

configuration it passes all the Mitel tests, and allows for the user to select 3 different dynamic range settings.

Mode

Dynamic range

Guard time

Mitel 0

>41 dB

34 ms

Mitel 1

>35 dB

34 ms

Mitel 2

>27 dB

34 ms

(pass level <40 ms)

Signal-to-noise ratio

14 dB

(pass level <15 dB)

Mitel talk-off test

3 digits detected

1 digit detected

0 digits detected

(pass level <30)

Frequency offset

detects all digits upto

(pass level detect at

±1.5%

±1.5%)

Twist

detects all digits upto 8 dB detects all digits upto 8 dB detects all digits upto 8 dB

(pass level >8 dB nor- normal twist and upto 4 dB normal twist and upto 4 dB normal twist and upto 4 dB

mal, >4 db reverse)

reverse twist

Processor Loading

Function

Program memory

Data Memory

Processing

Code

256

Tables

(words)

62+4n

Load (MIPS)

1.7 +0.16n

2.1 +0.51n

DTMF Transmitter

DTMF Receiver

388

106

50+25n

n = Number of channels

This overhead reduces as the frame size increases. At a frame size of 20 samples this overhead is 0.8 MIPS. This

code is designed for efficient multi-channel operation. For a small number of channels there is a more efficient ver-

sion.

This overhead reduces as the frame size increases. At optimum frame size of 105 overhead is 0.1 MIPS

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 17

DSP56307 Speech Coding Demonstration User Guide

Appendix E

Default Jumper Settings

The default jumper settings for the DSP56307EVM board are shown in Figure E-1 below.

J10

MODE SELECT

J11

+3.3V

+2.5V

DEBUG ENABLE

SW2

SW3

RS232

LED3

SW1

J11

MC74HCT04

DSP56002

AT29LV010A

Flash

RESET

DSP56307

MC34164

ESSI1

ESSI0

J10

MAX212

P6 LINE OUT

LED2

JTAG/OnCE

DEBUG

LM4880

MC33269

DSP56307EVM

SERIAL NO.

POWER

CS4218

LINE IN

LED1

J2, J3, J6 - HEADERS ONLY, NO JUMPERS

ESSI1

ESSI0

SAMPLE RATE SELECT

Figure E-1 DSP56307EVM Default Jumper Settings

Signals and Software Limited

Harrovian Business Village

Harrow Middlesex HA1 3EX

3 Jardine House

Bessborough Road

United Kingdom

Phone: +44 (0)181 426 9533

Fax:

+44 (0)181 869 1182

info@sasl.com

E-mail:

Page 18

DSP56307 Speech Coding Demonstration User Guide

Signals and Software Ltd

For more information on products and services from Signals and Software Ltd contact:

Signals and Software Ltd

3 Jardine House

Harrovian Business Village

Bessborough Road

Harrow

Middlesex

HA1 3EX

United Kingdom

Tel

Fax

+44 (0)181 426 9533

+44 (0)181 869 1182

Email info@sasl.com

For more information on DSP Software products from Motorola contact:

Software Business Development Group

Semiconductor Products Sector

Colvilles Road

Kelvin Estate

East Kilbride

Glasgow

G75 0TG

Scotland

Tel

Fax

+44 (0)1355 565253

+44 (0)1355 246335

E-mail R31577@email.sps.mot.com

All trademarks and registered trademark are the property of their respective companies

DSP56307SCDEMOUM [ETC]

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