Product Details

The “G.711 Appendix I Voice Codec with PLC” software library provides a combination of ITU-T G.711 voice codec and G.711 Appendix I packet loss concealment. G.711 is also known as a-law or µ-law encoding and decoding. This module operates at 8 kHz and is fully ITU compliant. It is typically used when communicating with a- and µ-law hardware codecs, in TDM trunks, or in VoIP when operating on G.711 RTP packets.


  • 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 Recommendation G.711 11/1988, ITU-T
  • Recommendation G.711 – Appendix I 9/1999
  • 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 and output buffer samples per block: 80
  • Sample Rate: 8 kHz
  • Bit Rate: 64 kbit/s
  • Multi-Channel: Fully re-entrant and multi-instancing capable

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 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 RAM (KiB) Data RAM (KiB) Constant Data Tables (KiB) MIPS
BF533 BF548 BF527
Encoder 3.35 0.02 0.23 0.09 0.09 0.09
Decoder 3.35 2.60 0.23 0.14 (1.09 for PLC) 0.13 (1.08 for PLC) 0.13 (1.08 for PLC)

  • This table highlights example Blackfin processors and expected MIPS performance. Some processors include additional L2 internal memory (e.g. BF548) which can help reduce MIPS when fully utilized.
  • Similarly, processors with high speed external memory interfaces (32-bit versus 16-bit or DDR versus SDRAM) will also help reduce overall MIPS requirements.
  • MIPS were measured using optimal memory layout
  • ITU-T reference vector "sweep.src" is used for MIPS measurement
  • The MIPS for PLC is the maximum MIPS when packet loss concealment is executed
  • Both instruction and 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.

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