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參數(shù)資料
| 型號： | STi4600 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 6 Channel Dolby AC-3 MPEG1/2 Audio Decoder(六通道音頻解碼器) |
| 中文描述： | 6聲道杜比AC - 3 MPEG1 / 2音頻解碼器（六通道音頻解碼器） |
| 文件頁數(shù)： | 10/52頁 |
| 文件大?。?/td> | 321K |
| 代理商： | STI4600 |
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STi4600
INTERNAL CIRCUIT DESCRIPTION
(Cont’d)
3.3 DECODING PROCESS
The decoding process in the STi4600 is done in
several stages :
– Parsing
– Main decoding
– Post decoding
– Bass redirection
Each of the stages can be activated or bypassed
according to the configuration registers.
Parsing:
The bitstream parsing is in charge of discarding all
the non audio information in order to transmit to
the next stage only the audio elementary stream
(AC3, MPEG1/2, LPCM,PCM).The parsing stage
checks also the syntax of the bitstream. Two kinds
of checks are done : checksum calculation and de-
tection of expected synchronization word. The
checksum is done for AC3 frame and MPEG-2 ex-
tension part. When an error occurs the bitstream is
discarded, and the parser tries to recover synchro-
nization. This leads to skip the erroneous frame at
the output stage.
Main decoding:
The input of this stage is an elementary stream,
the outputs are decoded samples. The number of
output channels is defined by the downmix register
(1 up to 6). The decoding formats currently sup-
ported are AC3 , MPEGI , MPEGII, LPCM.
Post decoding:
The post decoding includes specific PCM process-
ing : DC filter,deemphasis filter, Downsampling fil-
ter and also a Pro Logic decoder.
Bass redirection:
This stage redirects the low frequency signals to
the subwoofer and controls the volume of each
channel. The low frequencies are extracted from
the other channels (L,R,C,Ls,Rs,LFE).
3.3.1 Decoding States
There are three different decoder states:
Idle
,
Init
and
decode
(see Figure 4). Commands to change
the decoding states are described in Section 5.4.7
(eg. RUN, MUTE, PLAY).
Idle mode
In this mode the decoder is waiting for the RUN
command. This mode should be used to initialise
the configuration registers of the device. The DAC
connected to the device can be initialized during
this mode (set mute to 1).
Init mode
“Play” and “Mute” changes are ignored in this
mode. The internal state of play and mute will be
updated only when the decoder changes from the
state “init” to “decode”.The “init” phase ends when
the first decoded samples are at the output stage
of the device.
Decode mode
Figure 4. Decoding States
Play
X
X
Mute
0
1
Clock state
Not running
Running
PCM Output
0
0
Play Mute Clock state
0
0
0
1
1
0
1
1
Pcm Output
0
0
Decoded samples
0
Decoding
No
No
Yes
Yes
Not running
Running
Running
Running
Time
Idle
mode
Init
mode
Decode
mode
Soft reset
Run command
Decoder ready to play sample
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