Dolby Headphone v2, SHARC

The Dolby Headphone v2 library for the SHARC processor is a proprietary algorithm from Dolby Laboratories intended for creating 5.1 realistic surround sound effects on headphones.
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  • Input format: 32-bit floating point (range -1 to 1), little endian, non-interleaved. Input PCM has to be provided in separate buffers for each channel.
  • Number of input channels: From 1.0 to 7.1.
  • Output format: Same as input format.
  • Number of output channels: 2.
  • Sample Rate: All sampling frequencies specified by Dolby Headphone v2 (32, 44.1, 48, 88.2 and 96 kHz).
  • Block Size: no constraints.
  • Release format: Object code module with C source examples: Code compatible across the SHARC ADSP-2136x Processor Family and ADSP-214xx Processor Family.
  • Framework dependencies: None.
  • Multi-instancing: Fully re-entrant and multi-instance capable.
  • Conformance Standard: Dolby compliance/certification for Dolby Headphone v2 Implementation kit, Issue 2.0.
  • Certified Processors: ADSP-21362/3/4/5/6, ADSP-21367/8/9, ADSP-21462/5/7/9, ADSP-21471/2/5/8/9 and ADSP-21481/2/3/5/6/7/8/9.

Product Details

Dolby® Headphone v2 is a propriety algorithm from Dolby Labs intended for creating 5.1 realistic surround sound effects on headphones. The Dolby Headphone v2 technology is capable of processing 24 bit/96 kHz audio such as DVD Audio with MLP lossless which produces surround sound bit for bit identical to studio masters. Dolby Headphone v2 while providing benefits like personal listening experience, also delivers 5.1 surround effects on the stereo channels when used with Dolby Pro Logic II.

This module can only be shipped to pre-approved Dolby "qualified recipients".


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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.

Performance Metrics

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MIPS /Memory summary:

SHARC Processor  Code RAM (KiB)  Data RAM (KiB)  Constant Data Tables (KiB)  MIPS
Average Peak
 34.4 6.3 34.2 34.2
 6.1  34.4 6.3 34.3 34.3

  • This table highlights example SHARC processors and expected MIPS performance.
  • MIPS measured using typical bit rates Fs=48 kHz, optimal memory layout, worst case test vector, 7.1 channels, with a typical buffer size of 128 samples per channel running on a ADSP-21364 and ADSP-21469 processor silicon rev. 0.2.
  • “Data RAM” for one instance includes stack, scratch, instance, and minimum size single buffer shared for input and output.
  • 1 KiB = 1024 Bytes.
  • “Averaged Peak” is a four frame moving average of the MIPS consumed by the module.

Systems 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.
  • CrossCore® Embedded Studio for Analog Devices Processors.

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