STA321 datasheet(34/157 Pages) STMICROELECTRONICS

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Digital processing stage

STA321

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Doc ID 15351 Rev 3

Digital processing stage

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

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

Bq0

Bq12

EQ - tone control

13 biquads

kZ-1

Delay

- G2

- G0

- G1

- G3

Vol 3

Vol 2

Vol 1

Vol 0

Volume control

Limiter

rate

converter

Sample

Bq0

Pre scaler

SAI_in1

ADC

SAI_in2

SRCINSEL[7:6]

SRC1

ch0_in

ch1_in

PROC ch0

PROC ch1

PROC ch2

PROC ch3

SAI_in1

ADC

SAI_in2

SRC2

ch2_in

ch3_in

ch0_out

ch1_out

ch2_out

ch3_out

SRCINSEL[5:4]

FFX

2-channel signal

1-channel signal

To SAI_out

multiplexers

Processing

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