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STA335BWS Datasheet(PDF) 19 Page - STMicroelectronics |
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STA335BWS Datasheet(HTML) 19 Page - STMicroelectronics |
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19 / 68 page  STA335BWS Processing data paths 19/68 4 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. STA335BWS processing data flow 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 XOSetting 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 XOSetting User Defined If XO=0000 R L + + + C1Mx2 C2Mx1 C2Mx2 C3Mx1 C3Mx2 C1Mx1 Channel ½ Biquad #5 -------------- Hi-pass XO filter User-Defined Mix Coefficients Vol And Limiter Vol And Limiter Vol And Limiter Post scale Post scale Post scale Channel ½ Biquad #5 -------------- Hi-pass XO filter Channel 3 Biquad -------------- Low-pass XO filter Crossover Frequency determined by XOSetting 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 XOSetting User Defined If XO=0000 R L + + + C1Mx2 C2Mx1 C2Mx2 C3Mx1 C3Mx2 C1Mx1 Channel ½ Biquad #5 -------------- Hi-pass XO filter User-Defined Mix Coefficients Vol And Limiter Vol And Limiter Vol And Limiter Post scale Post scale Post scale Channel ½ Biquad #5 -------------- Hi-pass XO filter Channel 3 Biquad -------------- Low-pass XO filter |
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