STA321 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA321' PDF : 157 Pages View PDF
STA321
Digital processing stage
6.9
Bass and treble control
Preset values for the 11th and 12th biquads of every channel are stored in ROM in order to
achieve a bass and treble tone control.
They are channel independent and have 24 curves ranging from -12 to +12 dB gain with
1 dB steps. Their selection (and enable) is via registers BASS_SELx_R and TREB_SELx_R
where x is the number of the channel to be equalized.
The EQ curve and filter cut-off frequencies are shown in Figure 23 and Figure 24.
With a sampling frequency of 96 kHz (inside the processing block), the cut-off frequencies
are 3 kHz for treble curves and 150 Hz for bass curves.
Figure 23. Frequency responses of treble control at 1-dB gain steps
Figure 24. Frequency responses of bass control at 1-dB gain steps
Doc ID 15351 Rev 3
41/157
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