參數(shù)資料
型號: STV8217
廠商: 意法半導(dǎo)體
英文描述: Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
中文描述: 數(shù)字音頻解碼器/處理器為A2和麗音電視/錄像機(jī)
文件頁數(shù): 24/149頁
文件大?。?/td> 2775K
代理商: STV8217
Dedicated Digital Signal Processor (DSP)
STV82x7
24/149
4
Dedicated Digital Signal Processor (DSP)
A dedicated Digital Signal Processor (DSP) takes charge of all audio processing features and the
low frequency signal processing features of the demodulator. The internal 24-bit architecture will
ensure a high quality signal treatment and an excellent dynamic.
4.1
Back-end Processing
The “back-end” processing corresponds to the low frequency signal processing (32 kHz or higher
frequencies) of the demodulator and other inputs (I2S, ADC).
Figure 11
shows a flowchart of the back-end processing tasks. However, the figure shows that the
processing is only a SINGLE SOURCE PROCESSING flow (no processing is possible with
“Demod + SCART” and I2S inputs simultaneously) and that the selection of a headphone output
restricts the loudspeakers configuration to 2+1 instead of 5+1.
Figure 11: Back-end Audio Processing
DC
D
FM Channel1
FM Channel2
NICAM L
De-emphasis
Prescale
Dematrix
Autostandard
FM
FM
FM
Removal
Prescale
I2S
I2S in 1
I2S in 2
I2S in 3
DC
Prescale
NICAM
Removal
DC
Prescale
SCART
Removal
NICAM R
Dematrix
NICAM
SCART L
SCART R
SRC X2/X4
“I2S” Input Mode
“Demod + SCART” or “SCART only” Input Modes
D
LS
2
HP
2
SCART
2
LS
2 to 6
HP
2
SCART
2
S
S
(L and R)
(L and R)
(L and R)
(L,R,C,LFE,Ls,Rs)
(L and R)
(L and R)
De-emphasis
NICAM
S
S
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