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STA333BW Datasheet(PDF) 17 Page - STMicroelectronics |
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STA333BW Datasheet(HTML) 17 Page - STMicroelectronics |
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17 / 64 page  STA333BW Processing data paths 17/64 4 Processing data paths Here are some diagrams that represent the data processing paths inside STA333BW. The first 2x oversampling FIR filter allows 2fs 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 IIC registers for this specific usage). A pre scaler and a final post scaler provide full control over the signal dynamics before and after the filtering stages, respectively. A mixer function is also available. Figure 6. Processing data flow 1 Figure 7. Processing data flow 2 If C2TCB=0 BTC: Bass Boost/Cut TTC: Treble Boost/Cut PreScale Hi-Pass Filter Biquad #1 Biquad #2 Biquad #3 Biquad #4 De- Emphasis Bass Treble If HPB=0 User-Defined Filters If DEMP=0 If DSPB=0 and C2EQBP=0 x2 FIR over sampling R If C1TCB=0 BTC: Bass Boost/Cut TTC: Treble Boost/Cut From I2S input interface PreScale Hi-Pass Filter Biquad #1 Biquad #2 Biquad #3 Biquad #4 De- Emphasis Bass Treble If HPB=0 User-Defined Filters If DEMP=0 If DSPB=0 and C1EQBP=0 x2 FIR over sampling L Sampling frequency=Fs Sampling frequency=2xFs If C2TCB=0 BTC: Bass Boost/Cut TTC: Treble Boost/Cut PreScale Hi-Pass Filter Biquad #1 Biquad #2 Biquad #3 Biquad #4 De- Emphasis Bass Treble If HPB=0 User-Defined Filters If DEMP=0 If DSPB=0 and C2EQBP=0 x2 FIR over sampling R If C1TCB=0 BTC: Bass Boost/Cut TTC: Treble Boost/Cut From I2S input interface PreScale Hi-Pass Filter Biquad #1 Biquad #2 Biquad #3 Biquad #4 De- Emphasis Bass Treble If HPB=0 User-Defined Filters If DEMP=0 If DSPB=0 and C1EQBP=0 x2 FIR over sampling L Sampling frequency=Fs Sampling frequency=2xFs Crossover Frequency determined by XO Setting User Defined If XO=0000 R L + + + C1Mx2 C2Mx1 C2Mx2 C3Mx1 C3Mx2 C1Mx1 Hi-Pass XO Filter Hi-Pass XO Filter Lo-Pass XO Filter User-Defined Mix Coefficients Vol And Limiter Vol And Limiter Vol And Limiter Post scale Post scale Post scale Crossover Frequency determined by XO Setting User Defined If XO=0000 R L + + + C1Mx2 C2Mx1 C2Mx2 C3Mx1 C3Mx2 C1Mx1 Hi-Pass XO Filter Hi-Pass XO Filter Lo-Pass XO Filter User-Defined Mix Coefficients Vol And Limiter Vol And Limiter Vol And Limiter Post scale Post scale Post scale |
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