Broadcom BCM7405 - Features

2/24/2008 9T6WP
BCM7405 Preliminary Hardware Data Module
Functional Description 06/29/07
Broadcom Corporation
Page 1-34 Advanced Audio Module Document 7405-1HDM00-R
FEATURES
• The DSP System decodes any of:
- 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.
- 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.
- Dolby Digital Plus
- 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.
- 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.
- WMA, WMA Pro
• Supports:
- One stream of compressed data on SPDIF simultaneously with one stream of decompressed data on the dual
stereo DAC outputs.
- Compressed AAC, MPEG Layer 1, 2, and 3, DTS, and Dolby Digital on I
2
S output
- Dynamic Range Compression on all algorithms
- Annex B and C for Dolby Digital 5.1 (ATSC A/52a)
- 16 kHz, 32 kHz, 44.1 kHz, and 48 kHz sample rates for AAC and MPEG
- 32 kHz, 44.1 kHz, and 48 kHz sample rates for Dolby Digital
- Two-channel down mix for streams with more than two channels
• Includes:
- One pair of Audio DACs for L/R channel outputs
-One I
2
S input and one I
2
S output for PCM at sample rates up to 96 kHz
- 3-D SRS Audio
• SPDIF output:
- Up to 24-bit PCM
- Sample rates of 16 kHz, 32 kHz, 44.1 kHz, 48 kHz, and 96 kHz
- Pass-through of Dolby Digital, MPEG, and DTS audio from DVD program streams
- Pass-through of Dolby Digital, MPEG, and AAC audio from transport streams
- IEC 60958 specification for linear serial data transmission
- IEC 61937 specification for non-linear serial data transmission
- PLL for low jitter output
• PCM mode processing: mute, mono left, mono right, mono, stereo
• Test tone generation
• Digital volume controls, digital mixing, and mute
• Robust handling of transmission errors
- Detection of output FIFO empty
- Detection of corrupted sync word
- CRC error checking
- Illegal stream checking (bit rate, sample rate, frame size)