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Part: DSP56300G729ABP
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Company: Motorola Semiconductor Products
Datasheet: Download DSP56300G729ABP datasheet File size : 331 kB
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MOTOROLA
Semiconductor Software Product Brief
ITU G.729AB Vocoder
DSP56300G729ABP/D (Motorola Order Number) Rev. 0, 09/99
Introduction
In partnership with Signals + Software, Motorola has developed the G.729 Annex A (G.729a) and G729 Annex A with Annex B (G.729ab) speech coder software. This software offers excellent performance in a variety of Digital Simultaneous Voice Data (DSVD) applications, including the High-Performance Modem and Digital Set-top Box (DSTB) markets. The G.729a CODEC is accepted as part of the ITU standard for DSVD (V.70). G.729a will also be applicable in a number of different markets outside DSVD, where high compression and quality and low MIPS voice channels are required. Sold under license, the software is available for the Motorola DSP56300 family of processors.
Background
G.729a is a reduced complexity speech coder derived from the ITU-recommended speech coder, G.729. The Annex B extension adds Voice Activity Detection (VAD), Discontinuous Transmission (DTX) and Comfort Noise Generation (CNG) algorithms to G.729a. G.729a provides narrowband speech (300-3400Hz, sampled a 8kHz) to a bit rate of 8kb/s. This toll quality speech coder gives an eight-to-one bandwidth saving over standard 64kb/s G.711 PCM.
Features and Performance
The G.729a specification requires a Conjugate-Structure Algebraic-Code-Excited Linear Prediction (CS-ACELP) algorithm. Table 1 summarizes the performance of the algorithm.
Table 1. Algorithm Performance
Bit Rate (kb/s) Audio Quality 8
· ·
· ·
Single Transcode Coding Delay
Comparable to 64kb/s PCM (g.711), identical to G.726 at 32kb/s 35MS'
Transmission Properties
Equivalent to 64kb/s PCM
Note: This delay figure represents combined encode, decode, pre and post filter operations
Program Memory Function Code Encoder Decoder Encode / Decode 6028 2404 7700 Tables 2927 2115 2956
X Data Memory Variables 1360+189n 890+37n 1360+226n Tables 1547 1295 1547
Y Data Memory Variables 1059+386n 239+371n 1059+757n Tables 1360 800 1389
Processing Load (MIPS) 10.58n 2.02n 12.6n
© Motorola, Inc., 1999
ITU G.723.1 Vocoder
G.729a is less complex than G.729, requiring less MIPS, RAM, and ROM, with a low audio delay (10ms). However, it is bit stream compatible with G.729, at the expense of a marginal reduction in speech quality. This interoperability with G.729 is important because G.729 and G.729a are becoming the ITU's most commonly used voice compression standards and are widely accepted within the telecommunications industry. This fixed point implementation of the G.729a software passes the full set of ITU G.729a test vectors.
Interface Details
Program Memory Function Code Encoder + Annex B Decoder + Annex B Encoder/Decode + Annex B 9121 3521 11247 Tables 3288 2379 3317
X Data Memory Variables 1439+259n 985+41n 1439+300n Tables 1551 1299 1551
Y Data Memory Variables 1129+465n 243+393n 1129+858n Tables 1717 1060 1746
Processing Load (MIPS) 10.83n 2.25n 13.08n
Interface Details
The DSP code consists of initialization and processing routines for both the encoder and decoder (including post filter) functions. An additional routine, in line with the ITU specification, performs the required synchronization facility (usually only required to verify that the code passes the test vectors). The initialization routines are called only on DSP reset. The audio input and output format is 8kHz linear samples, and the processing routines are called once per 80-sample frame. The encoder converts each input frame into an 80-bit parameter stream, which the decoder uses to reconstruct the signal.
Applications and Availability
The code is available now, under license, for a one-time payment and/or royalties, depending on the commercial application. Also available are: · · · Demonstration systems Application notes Support consultancy for code porting and integration
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ITU G.723.1 Vocoder
Motorola
Applications and Availability
DSP56300 Application Software Modules
Application/Module CDMA Speech Codecs IS-127 (EVRC) IS-96A (8Kbps QCELP) IS-733 (13Kbps QCELP) GSM Speech Codecs Half Rate (HR) VSELP, 5.6Kbps Full Rate (FR) RPE-LTP, 13Kpbs Enhanced Full Rate (EFR) ACELP, 12.2Kbps Adaptive Multi-Rate (AMR) ITU Standard Speech Codecs G.711, 48, 56, and 64Kbps G.722, 48, 56, and 64Kbps G.723.1, 5.3 and 6.4Kbps G.726, 16, 24, 32, and 40Kbps G.728, 16Kbps G.729 with annex A and B Other Speech Processing Acoustic Echo Cancellation General Telecommunication Multi-channel Dual Tone Multi-Frequency (DTMF) Transmit and Receive Modem and Wireline Group 3 FAX Modem Pumps (V.17, V.21, V.27ter, V.29) V.32/V.32bis Data Modem Pump G.165/G.168 Hybrid Echo Cancellation (HEC) MSW1B002AAF MSW1B003AAF MSW1A001AAF MSW1A002AAF MSW1A003AAF MSW1D001AAF MSW1D002AAF MSW1D004AAF MSW1D007AAF MSW1D003AAF MSW1D006AAF MSW1D201AAF MSW1D201AAF MSW1D202AAF Consult Factory MSW1D103AAF MSW1D101AAF Consult Factory Part Number
Motorola
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For further information, visit our Web site at http://www.sasl.com, send us email at sales@sasl.com, or contact your nearest Signals + Software Office at: Signals + Software, Ltd. The Heights Lowlands Road, Harrow HA1 3AW United Kingdom Tel: +44 (0) 208 872 9000 FAX: +44 (0) 208 872 9001 Signals + Software, Inc. Sugarloaf Corporate Center, Suite 360, 2180 Satellite Blvd Duluth, Georgia,
Tel: +1 (678) 584 8680 FAX: +1 (678) 584 8681
Motorola and Signals + Software (S+S) reserve the right to make changes without further notice to any products herein. Motorola and S+S make no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola or S+S assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA/Europe/Locations Not Listed: Motorola Literature Distribution P.O. Box 5405 Denver, Colorado 80217 1 (800) 441-2447 1 (303) 675-2140 Motorola Fax Back System (MfaxTM): TOUCHTONE (602) 244-6609 1 (800) 774-1848 RMFAX0@email.sps.mot.com Asia/Pacific: Motorola Semiconductors H.K. Ltd. 8B Tai Ping Industrial Park 51 Ting Kok Road Tai Po, N.T., Hong Kong 852-26629298 Technical Resource Center: 1 (800) 521-6274 DSP Helpline dsphelp@dsp.sps.mot.com Japan: Nippon Motorola Ltd SPD, Strategic Planning Office141 4-32-1, Nishi-Gotanda Shinagawa-ku, Japan 81-3-5487-8488 Internet: http://www.motorola-dsp.com/
Applications and Availability
Motorola
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