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STA382BW Datasheet(PDF) 31 Page - STMicroelectronics |
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STA382BW Datasheet(HTML) 31 Page - STMicroelectronics |
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31 / 172 page  STA382BW Device overview Doc ID 022783 Rev 1 31/172 The band splitter filter coefficients have a user-selectable range [-1, 1), [-2, 2) and [-4, 4). The RAM coefficient 0x7 is responsible for these settings according to Table 9. The range default value is [-4, 4). Table 9. Coefficients extended-range configuration 0x74h Please refer to Section 6.24: User-defined coefficient control registers (addr 0x27 - 0x37) and to Table 13 for further details. Figure 9. Band splitter with 4th order filtering 4.3.3 Level meter The level meter block measures the input signal level (in dB). Two kinds of measures are performed: peak and RMS. The mapper configuration and the input signal automatically determine which measurement to take into account. 4.3.4 Mapper The mapper block computes the appropriate attenuation value (expressed in dB) to be applied to the signal, basing its calculations on the level meter output value, on the compressor threshold and on the limiter threshold.The attenuation value is then passed to the attenuator block. CEXT_Bx[1] CEXT_Bx[0] Range 00 [-1;1) 01 [-2;2) 10 [-4;4) 1 1 Reserved … … += BQ 0 BQ 0 BQ 1 BQ 1 Band Splitter Band 1 Band 0 Input Ch x Output Ch x |
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