2/24/2008 9T6WP
BCM7405
Preliminary Hardware Data Module
Functional Description
06/29/07
Bro a d c o m C o rp o r a ti o n
Page 1-34
Advanced Audio Module
Document
7405-1HDM00-R
F
EATURES
•
The DSP System decodes any of:
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AAC-LC (ISO/IEC 13818-7) Input can be up to 5.1 channels with one coupling channel (dependent or independent)
and up to 288-kbps per-channel. Output is downmixed to two channels. Supported sampling rates are 16 kHz, 32
kHz, 44.1 kHz, and 48 kHz. Both ADTS and ADIF formats are supported.
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AAC-LC+SBR (ISO/IEC 13818-7, 14496-3:2001/AMD1, aka HE-AAC, aacPlus, AAC-SBR, AAC-he). High efficiency
AAC level 4 (5.1 channels), and low power SBR tool. Up to 288-kbps per channel. Supported sampling rates are 16
kHz, 32 kHz, 44.1 kHz, and 48 kHz.
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Dolby Digital Plus
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Dolby Digital (ATSC-A52/a). Input can be up to 5.1 channels. Output is downmixed to two channels. All sample rates
and all bitrates are supported.
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MPEG-1 (ISO/IEC-11172-3) Layer 1, 2, 3 (MP3). Input is 2.0 channels. All sample rates and bitrates are supported
except for the free bitrate.
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WMA, WMA Pro
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Supports:
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One stream of compressed data on SPDIF simultaneously with one stream of decompressed data on the dual
stereo DAC outputs.
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Compressed AAC, MPEG Layer 1, 2, and 3, DTS, and Dolby Digital on I
2
S output
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Dynamic Range Compression on all algorithms
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Annex B and C for Dolby Digital 5.1 (ATSC A/52a)
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16 kHz, 32 kHz, 44.1 kHz, and 48 kHz sample rates for AAC and MPEG
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32 kHz, 44.1 kHz, and 48 kHz sample rates for Dolby Digital
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Two-channel down mix for streams with more than two channels
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Includes:
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One pair of Audio DACs for L/R channel outputs
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One I
2
S input and one I
2
S output for PCM at sample rates up to 96 kHz
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3-D SRS Audio
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SPDIF output:
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Up to 24-bit PCM
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Sample rates of 16 kHz, 32 kHz, 44.1 kHz, 48 kHz, and 96 kHz
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Pass-through of Dolby Digital, MPEG, and DTS audio from DVD program streams
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Pass-through of Dolby Digital, MPEG, and AAC audio from transport streams
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IEC 60958 specification for linear serial data transmission
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IEC 61937 specification for non-linear serial data transmission
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PLL for low jitter output
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PCM mode processing: mute, mono left, mono right, mono, stereo
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Test tone generation
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Digital volume controls, digital mixing, and mute
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Robust handling of transmission errors
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Detection of output FIFO empty
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Detection of corrupted sync word
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CRC error checking
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Illegal stream checking (bit rate, sample rate, frame size)