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STA381BWS 数据表(PDF) 32 Page - STMicroelectronics |
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STA381BWS 数据表(HTML) 32 Page - STMicroelectronics |
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32 / 174 page  Device overview STA381BWS 32/174 DocID018937 Rev 7 4.3.1 STC block diagram Figure 10. STCompressorTM block diagram The STC takes as input 2 channels and every channel is processed independently (i.e. an independent DRC for each band of each channel) following the steps listed below (Figure 10): 1. Splits the input signal into 2 bands (band splitter) 2. Measures the level of the signal (level meter) 3. Computes the attenuation (mapper) 4. Applies the attenuation and offset (attenuator) The band splitter settings are common to both the processing channels while the settings of the remaining blocks can be independently set for each band of each processing channel. Caution: All the settings explained hereafter apply only to the behavior of the STCompressorTM. For the settings concerning other device operating configurations (see Chapter 4.1: Processing data path) please refer to the appropriate paragraphs and registers. 4.3.2 Band splitter The band splitter block is used to divide the signal into 2 sub-bands (typically low- and high- frequency bands). This is done through two 2nd order biquads (IIR filters) for each band, thus allowing to have up to a 4th order filter per band. This feature guarantees a totally flat band recombination (see Figure 11). Using different filtering orders, indeed, causes a non- negligible gain around the filter’s cutoff frequency, endangering the overall audio fidelity and, eventually, also the safety of the speaker. The sub-band recombination can be enabled or disabled. Level Meter Map p er Attenuator Offs et X Level Meter Map p er Attenuator X Offs et + Ban d Sp litter Ban d 0 (Lo w freq s) Ban d 1 (Hig h freq s) In p ut Ch 0 Outp ut Ch 0 DRC 0 DRC 1 Lev el Meter Map p er Atten uato r Offset X Lev el Meter Map p er Atten uato r X Offset + Ban d Sp litter Ban d 0 (Lo w freq s ) Ban d 1 (Hig h freq s) In p ut Ch 1 Outp ut Ch 1 DRC 2 DRC 3 Obsolete Product(s) - Obsolete Product(s) |
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