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G.729AB Voice Codec

G.729AB Voice Codec

Product
Details
System Requirements
Related Software
Related Hardware
Performance Metrics

Product Details

ITU-T Recommendation G.729 describes a voice compression algorithm based on Conjugate-Structure Algebraic-Code-Excited Linear Prediction (CS-ACELP). Annex A describes a reduced complexity version which is bit-stream interoperable with the full version of G.729. Annex B describes a silence compression scheme that includes Voice Activity Detection (VAD), Discontinuous Transmission (DTX) and Comfort Noise Generator (CNG) algorithms. G.729 is widely used as one of the key software components for packet based voice devices such as VoIP phones and private branch exchanges.

Features

API: C callable 'push'-type API
Compatible with Analog Devices Blackfin processor family
Rigorously tested
The module has no dependencies on processor peripherals or registers, adding greater system flexibility and ease of use
Conformance Standard: ITU-T G.729A Annex B
Target Processor: Code compatible across the Blackfin processor family ADSP-BF5xx
Framework dependencies: None. No dependencies on processor peripherals or registers
Release format: Object code module with C source wrapper
Input format: Mono channel, non-interleaved buffer
Encoder: signed 16-bits little-endian PCM samples
Decoder: 16 bit per bit of unpacked bit stream or, 1 bit per bit of packed bit stream
Output format: Mono channel, non-interleaved buffer
Decoder: Signed 16-bits little-endian PCM samples.
Encoder: 16 bit per bit of unpacked bit stream or, 1 bit per bit of packed bit stream
Input and output buffer samples per frame:
160 bytes for PCM buffers
164 bytes for unpacked bit stream buffers or, 14 bytes for packed bit stream buffers
Sample Rate: 8 kHz
Bit rate: 8 kbit/s
Multi-channel: Fully re-entrant and multi-instancing capable

Product Downloads

Download Production Code (Rev. 3.0.0)

System Requirements

Windows XP Professional SP3 (32-bit only).
Windows Vista Business/Enterprise/Ultimate SP2 (32-bit only). It is recommended to install the software in a non-UAC-protected location.
Windows 7 Professional/Enterprise/Ultimate (32 and 64-bit). It is recommended to install the software in a non-UAC-protected location.

Minimum of 2 GHz single core processor, 3.3 GHz dual core is recommended.
Minimum of 1 GB memory (RAM), 4 GB is recommended.
Minimum of 2 GB hard disk (HDD) space is required.

Related Software

VisualDSP++ 5.0 and Latest Update

Related Hardware

Processor: ADSP-BF5xx, code compatible across the Blackfin processor family
Hardware: Evaluation board, for example ADSP-BF537 EZ-KIT Lite®

Performance Metrics

MIPS summary:

Code memory (KiB)	Data RAM (KiB)	Constant Data Tables (KiB)	MIPS
			BF537		BF548		BF527
			Average	Peak	Average	Peak	Average	Peak
29.3	6.8	6.1	6.77	6.97	6.77	6.97	6.77	6.97

This table highlights example Blackfin processors and expected MIPS performance.
MIPS measured using typical bit rates 8 kbit/s, Fs = 8 kHz, optimal memory layout with code and data in L1 memory, worst case test vector, mono channel.
Both instruction and Bank A data cache have been enabled and data cache was set to write-back mode.
"Data RAM" refers to a single instance and includes stack, scratch and instance/state memory as well as minimum-size input and output single buffers.
1 KiB = 1024 Bytes.

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Availability and Licensing

Each module supports the Analog Devices, Inc. (ADI) Blackfin or SHARC Processor family and is a licensed product that is available in object code format. Recipients must sign or accept a license agreement with ADI prior to being shipped or downloading the modules identified in the license agreement.