STA335BWS View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STA335BWS

2.1 channels high efficiency digital audio system

STMicroelectronics 

STA335BWS

4

Processing data paths

Processing data paths

Here after some pictures that represent the data processing paths inside STA335BWS. A

first 2x oversampling FIR filter allows a 2*fs audio processing. Then a selectable high pass

filter removes the DC level. 4 biquads filter allow a full equalization system. A final crossover

filter is present. This filter can eventually be used as a fifth biquad stage, see the I2C

registers settings for this specific usage. A prescaler and a final post scaler allow a full

control over the signal dynamic respectively before and after the filtering stages. A mixer

function is also available.

Figure 6.

Sampling

frequency=Fs

STA335BWS processing data flow

Sampling

frequency=2xFs

From

I2S input

interface

x2

FIR

over

sampling

PreScale

Hi-Pass

Filter

If HPB=0

If DEMP=0

Biquad

#1

Biquad

#2

Biquad

#3

Biquad

#4

De-

Emphasis

Bass

Treble

L

User-Defined Filters

If DSPB=0 and C1EQBP=0

If C1TCB=0

BTC: Bass Boost/Cut

TTC: Treble Boost/Cut

L

R

x2

FIR

over

sampling

PreScale

Hi-Pass

Filter

If HPB=0

If DEMP=0

C1Mx1

+

C1Mx2

Biquad

#1

Biquad

#2

Biquad

#3

Biquad

#4

De-

Emphasis

Bass

Treble

R

User-Defined Filters

If DSPB=0 and C2EQBP=0

If C2TCB=0

BTC: Bass Boost/Cut

TTC: Treble Boost/Cut

HC-Bi---hPiq-aF-au-nis-aln-tsed-e-r-l#-½5X--O

Hi-pass XO

filter

Vol

And

Limiter

Post scale

C2Mx1

+

C2Mx2

HCi-hPaansnsel ½XO

BiqFuialtedr#5

--------------

Hi-pass XO

filter

Vol

And

Limiter

Post scale

C3Mx1

+

C3Mx2

Channel 3

Lo----PB-F-ai-qis-lu-tse-a-rd---X-O

Low-pass XO

filter

Vol

And

Limiter

Post scale

User-Defined Mix Coefficients Crossover Frequency determined by XOSetting

User Defined If XO=0000

19/68

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