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MPEG-4 AAC-BSAC DECODER

Bit Slice Arithmetic Coding (BSAC) slices the quantized spectrum into layers and each layer is arithmetic coded. BSAC can be used in audio coding for bit-rate scalability during the encoding or decoding process.

The concept of BSAC was standardized for MPEG-4 AAC by ISO/IEC 14496-3 subpart 4. The difference between MPEG-4 BSAC and the standard AAC is that the quantized values are ...More

MPEG-4 AAC-BSAC DECODER

Product Description

Bit Slice Arithmetic Coding (BSAC) slices the quantized spectrum into layers and each layer is arithmetic coded. BSAC can be used in audio coding for bit-rate scalability during the encoding or decoding process.

The concept of BSAC was standardized for MPEG-4 AAC by ISO/IEC 14496-3 subpart 4. The difference between MPEG-4 BSAC and the standard AAC is that the quantized values are arithmetically coded. A group of slices is called a layer and the layers can be decoded independently. Few layers are sufficient to be decoded to produce reasonably good quality audio. This gives QoS scalability and is very important in error-prone media like wireless. MPEG-4 BSAC is adopted by the Multimedia standard T-DMB.

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TOOLS, SOFTWARE & SIMULATION MODELS

Features

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Functions

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Performance Metrics

MIPS summary:

Memory With Instruction and Data Cache enabled

Instruction Memory (KB) Data Memory (KB)
On-chip Off-chip On-chip Off-chip
30.6 4.4 58 8.629

MIPS Requirement: MIPS required for the above configuration for a 48Khz vector for various bitrates

Bit Rate (kbps) Average MIPS Peak MIPS
64 14.8 19.2
48 12.8 15.9
  • The MIPS performance was measured using worst case SQAM test vectors & expressed as Average and Peak figures.
  • Integrators will need to budget their MIPS based on their system requirements.

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Applications

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Requirements

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Availability and Licensing

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

Contact your ADI Sales Rep to request this code. If you need to find a Sales Rep in your area, please visit the Sales & Distributor Map/Listing.

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