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Audio Mixer

Product Details

The Audio Mixer has been designed and optimized to run on the Analog Devices’ Blackfin processor family. It is a self-contained software module that can be used directly for VoIP applications. It has been rigorously tested for various combinations.

It contains a standard C-callable API. The code has been implemented using Instruction and Data cache and has no dependencies on processor peripherals or registers. This makes system integration much easier.

Features

  • Reconfigure Control Input: Configurable input and output gains between frames. Slew of gains for smooth output Variable Stride for both input and output
  • Slew: When gain controls or the channel mask settings are changed then it would result in a glitch in the output. To prevent this, slewing is done where the effect of changing these settings is seen gradually instead of a sudden spike
  • Channel Mask: Sometimes when an input channel decides to leave the conference or suddenly tries to contribute to the mixing, then it is gradually removed or included respectively in the mixing process.
  • Conference Mixing : Provision to exclude respective input channel from the mixer output
  • Error Codes : Informs the application about the insufficient memory condition, when sufficient memory is not available for mixing process. Reports up to 4 other unique high level error codes
  • Target Processors: BF518, BF527, BF533 and BF561. Code compatible across the Blackfin processor family
  • Framework Dependencies: None
  • Release format: Object code module with C interface
  • Input: 16bit PCM channels
  • Output: 16 bit PCM channels
  • Output Buffer Size (max) : 4096 Bytes
  • Sampling Rate: 8000 Hz
  • Multi-instance: Yes

Product Downloads

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.

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Performance Metrics

 MIPS summary:

Code memory (KiB) Data RAM (KiB) Constant Data Tables (KiB) MIPS Average
2.78 8.47 0 0.82

  • MIPS measured using 3 input channels, 3 output channels, optimal memory layout, running on a BF533 processor.
  • Code compatible across all BF5xx processors, with silicon anomaly workarounds implemented based on BF533 Silicon Revision 0.3 and later.
  • "Data RAM" for one instance, includes Scratch, Instance/State, Minimum
  • Input and Output Single Buffers.
  • BF518, BF533, BF54x and BF561 supported.

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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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