STA323W datasheet(7/71 Pages) STMICROELECTRONICS

7 / 71 page

STA323W

Description

7/71

Figure 2.

Channel signal flow diagram through the digital core

1.2

EQ processing

Two channels of input data (re-sampled if necessary) at 96 kHz are provided to the EQ

processing block. In these blocks, up to four user-defined Biquads can be applied to each of

the two channels.

Pre-scaling, DC-blocking high-pass, de-emphasis, bass, and tone control filters can also be

implemented by means of configuration parameter settings.

The entire EQ block can be bypassed for all channels simultaneously by setting the DSPB

bit to '1'. The CxEQBP bits can also be used to bypass the EQ functionality on a per channel

basis. Figure 3 shows the internal signal flow through the EQ block.

Figure 3.

Channel signal flow diagram through the EQ block

Channel

mapping

Re-sampling

processing

I2S

input

Mix

DDX

Crossover

filter

Volume

limiter

Interp

DDX

output

pre-scale

High pass

BQ#1

Re-sampled

input

Treble

Bass

filter

mix

filter

BQ#2

BQ#3

BQ#4

De-

emphasis

filter

If CxTCB = 0

BTC: bass boost/cut

TTC: treble boost/cut

If DEMP = 1

4 biquads

User defined if AMEQ = 00

Perset EQ if AMEQ = 01

Auto loudness if AMEQ = 10

If HPB= 0

If DSPB = 0 and CxEQB = 0

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