AN3959 datasheet(38/65 Pages) STMICROELECTRONICS

38 / 65 page

Software setup to use the STA381BW/STA381BWS devices (ST Map)

AN3959

38/65

Doc ID 022081 Rev 3

Software setup to use the STA381BW/STA381BWS

devices (ST Map)

7.1

Processing configuration

Figure 44.

Processing path

●

By default, the post-scale is linked (all channels use the channel-1 coefficient value)

– To use different coefficients, bit D3 register 0x03 must be set to 0

●

By default, all 8 biquads are enabled

●

By default, all biquads are linked (all channels use the channel-1 coefficient values)

– To use different coefficients, bit D4 register 0x03 must be set to 0

●

By default, bass and treble are bypassed

– To use bass, bit D1 register 0x36 must be set to 0

– To use treble, bit D0 register 0x36 must be set to 0

Figure 45.

2.1-channel with STCompressorTM

I2S In p ut

Interface

X2O v er-

-sampling

FIR

Pre-

-scale

Hi-Pas s

Filter

Biq uad

U s er D efined F ilters

Biq uad #5

De-emp h

Biq uad #6

Bas s

Biq uad #7

Treble

To n e Co ntrol

X2O v er-

-sampling

FIR

Pre-

-scale

Hi-Pas s

Filter

Biq uad

U s er D efined F ilters

To n e Co ntrol

Pro c es s ing F requency = 2x F s

Biq uad #5

De-emp h

Biq uad #6

Bas s

Biq uad #7

Treble

By d efault tw o c h an nels

are lin k ed

By d efault tw o c h an nels

are lin k ed

Pro c es s ing F requency = 2x F s

C ros s o v e r F requenc y

D e t e rm ined by X O S e t t in g

(U s er D efin ed If

XO =0000)

C1Mx1

U s er-D ef in ed

M ix C o e f f icie n t s

C h annel ½

Biq uad #8

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

Hi-p as s XO

Filter

S TC o m p re sso r

Vo lum e

And

Lim iter

DC Cut

Filter

Po s t Sc ale

C1Mx2

C2Mx1

C h annel ½

Biq uad #8

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

Hi-p as s XO

Filter

S TC o m p re sso r

Vo lum e

And

Lim iter

DC Cut

Filter

Po s t Sc ale

C2Mx2

C3Mx1

Ch an n el 3

Biq uad #8

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

Lo w -p ass XO

filter

Vo lum e

And

Lim iter

DC Cut

Filter

Po s t Sc ale

C3Mx2

By d efault th e c h an nels

are lin k ed

AN3959 Datasheet(PDF) 38 Page - STMicroelectronics

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