ST18-AU1 STMICROELECTRONICS [STMicroelectronics], ST18-AU1 Datasheet - Page 5
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ST18-AU1
Manufacturer Part Number
ST18-AU1
Description
SIX-CHANNEL DOLBY AC3/MPEG2 AUDIO DECODER
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.ST18-AU1.pdf
(87 pages)
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The ST18-AU1 is a single-chip multi-function audio processor for Dolby AC-3, MPEG-1/
MPEG-2 Layer-I/II audio encoded bitstreams, and DVD Linear PCM. It is capable of decoding
up to 5.1 channels of input Dolby AC-3 or MPEG-2 multi-channel encoded audio, and down
mixing to 2 channels of PCM output audio. Maximum input data rates for Dolby AC-3 bitstream
and MPEG-2 audio bitstream are 448 Kbits/s and 912 Kbits/s respectively. It also supports up
to 8 channel linear PCM input with by-pass, down-sampling, and down-mixing function. The
linear PCM multi-channel input modes available are:
The input bitstream is taken from the multi-format serial input, and decoded according to the
selected MPEG-1, MPEG-2 (in the case of Karaoke capable mode), AC-3 decoder or Linear
PCM processor. A Packet Demux de-multiplexes the input if it is MPEG-1 or DVD/MPEG-2
PES packetized. For an input bitstream with more than 2 encoded audio channels, the
decoded channels are mixed down to 2 channels with the Dolby Surround compatible or
karaoke capable option, and outputted through a multi-format serial output port. The input AC-
3, MPEG bitstream, or decoded PCM can be outputted through an IEC-958 (S/PDIF)
Formatter/Transmitter. The AC-3 or MPEG S/PDIF output bitstream is delayed and
synchronized with the output decoded PCM.
The Karaoke Capable mode defined in Dolby AC-3 or DVD to allow the multi-channel audio
stream to convey channels designed as L, R (2-ch stereo music), M (guide melody), and V1,
V2 (one or two vocal/supplementary tracks) are supported. This Karaoke capable decoder
allows the user to choose to have the decoder reproduce any of the guide melody and vocal/
supplementary channels. Centre and surround mix levels either controlled by the user or within
the bitstream are used to down mix the M channel and the V1, V2 channels respectively.
The selectable Linear PCM Processor functions are:
Depending on the application, the decoded PCM audio output is selectable to be 16, 18, 20 or
24 bits, and the sampling rates of the PCM output are 32 kHz, 44.1 kHz, 48 kHz or 96 kHz.
External A/V synchronization can be assisted by the System Time Clock (STC) within the
Timer and the PTS extracted from the packetized input. A serial I
INTRODUCTION
48 kHz/16-bit up to 8 ch @ max 6.144 Mbps
48 kHz/20-bit up to 6ch @ max 5.760 Mbps
48 kHz/24-bit up to 5ch @ max 5.760 Mbps
96 kHz/16-bit up to 4ch @ max 6.144 Mbps
96 kHz/20-bit up to 3ch @ max 5.760 Mbps
96 kHz/24-bit up to 2ch @ max 4.608 Mbps
44.1 kHz/16-bit 2ch (CD-DA).
down-mixing to 2 channels,
down-sampling for 96kHz to 48kHz,
noise shaped quantization for 24-bits or 20-bits to 16-bits.
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C interface to host
ST18-AU1
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