STA321 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA321' PDF : 157 Pages View PDF
Digital processing stage
6
Digital processing stage
STA321
6.1
Signal processing flow
The STA321 provides 4 channels of audio signal processing. The block diagram is shown in
the following figure.
Figure 13. Processing flow
Sample
rate
converter
- G0
- G1
- G2
- G3
Pre scaler
Bq0
Bq12
Bq0
Bq12
Bq0
Bq12
Bq0
Bq12
EQ - tone control
13 biquads
kZ -1
kZ -1
kZ -1
kZ -1
Delay
Vol 0
Vol 1
Vol 2
Vol 3
Volume control
Limiter
Left and right channels coming from the two serial audio interfaces and ADC (left and right
channels) are fed into the selection multiplexer (controlled by register SRCINSEL on
page 128), so that each channel can be connected to any desired processing chain. The
four channels are then sample rate converted to the fixed internal sampling rate. Pre mix,
EQ/tone processing, programmable delay, post mix, and volume/limiter make up the
STA321 signal processing chain.
Figure 14. Processing data multiplexer
SRCINSEL[7:6]
SAI_in1 32 00
ADC
16 01
SAI_in2 32 10
SAI_in1 32 00
ADC
16 01
SAI_in2 32 10
SRC1
SRC2
24 ch0_in
ch1_in
24
PROC ch0
To SAI_out
PROC ch1 24 multiplexers
24
PROC ch2
24
PROC ch3
Processing
24 ch2_in
ch3_in
20
ch0_out
20
ch1_out
FFX
20
ch2_out
20
ch3_out
SRCINSEL[5:4]
2-channel signal
1-channel signal
34/157
Doc ID 15351 Rev 3
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