sta333bwqs13tr STMicroelectronics, sta333bwqs13tr Datasheet - Page 20

• Manufacturer Part Number: sta333bwqs13tr
• Description: 2.1-channel High-efficiency Digital Audio System With Qsound Qhd
• Manufacturer: STMicroelectronics

Processing data paths
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Processing data paths
Here are some diagrams that represent the data processing paths inside STA333BWQS.
The first 2-times oversampling FIR filter allows 2x fs audio processing. Then a selectable
high-pass filter removes the DC level. Four biquad filters allow a full equalization system. A
final crossover filter is present that can alternatively be used as a fifth biquad stage, see the
I
over the signal dynamics before and after the filtering stages, respectively. A mixer function
is also available.
Figure 6.
2
Sampling
Sampling
frequency=Fs
frequency=Fs
C registers for this specific usage. A pre scaler and a final post scaler provide full control
From
From
I2S input
I2S input
interface
interface
R
R
L
L
sampling
sampling
Processing data flow
sampling
sampling
over
over
FIR
FIR
over
over
FIR
FIR
x2
x2
x2
x2
Sampling
Sampling
frequency=2xFs
frequency=2xFs
If DEMP=0
If DEMP=0
PreScale
PreScale
If DEMP=0
If DEMP=0
PreScale
PreScale
User-Defined Mix Coefficients
User-Defined Mix Coefficients
C1Mx1
C1Mx1
C1Mx2
C1Mx2
C2Mx1
C2Mx1
C2Mx2
C2Mx2
C3Mx1
C3Mx1
C3Mx2
C3Mx2
If HPB=0
If HPB=0
If HPB=0
If HPB=0
Hi-Pass
Hi-Pass
Hi-Pass
Hi-Pass
+
+
+
+
+
+
Filter
Filter
Filter
Filter
Crossover Frequency determined by XO Setting
Crossover Frequency determined by XO Setting
User Defined If XO=0000
User Defined If XO=0000
Biquad
Biquad
Biquad
Biquad
#1
#1
#1
#1
Hi-Pass
Hi-Pass
Hi-Pass
Hi-Pass
Lo-Pass
Lo-Pass
If DSPB=0 and C2EQBP=0
If DSPB=0 and C2EQBP=0
If DSPB=0 and C1EQBP=0
If DSPB=0 and C1EQBP=0
User-Defined Filters
User-Defined Filters
Filter
Filter
Filter
Filter
Filter
Filter
User-Defined Filters
User-Defined Filters
Biquad
Biquad
Biquad
Biquad
#2
#2
#2
#2
XO
XO
XO
XO
XO
XO
Biquad
Biquad
Biquad
Biquad
#3
#3
#3
#3
Biquad
Biquad
Biquad
Biquad
#4
#4
#4
#4
Limiter
Limiter
Limiter
Limiter
Limiter
Limiter
And
And
And
And
And
And
Vol
Vol
Vol
Vol
Vol
Vol
Emphasis
Emphasis
Emphasis
Emphasis
De-
De-
De-
De-
If C2TCB=0
If C2TCB=0
BTC: Bass Boost/Cut
BTC: Bass Boost/Cut
TTC: Treble Boost/Cut
TTC: Treble Boost/Cut
Bass
Bass
If C1TCB=0
If C1TCB=0
BTC: Bass Boost/Cut
BTC: Bass Boost/Cut
TTC: Treble Boost/Cut
TTC: Treble Boost/Cut
Bass
Bass
Post scale
Post scale
Post scale
Post scale
Post scale
Post scale
STA333BWQS
Treble
Treble
Treble
Treble
R
R
L
L