STA321 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STA321

4-channel digital audio system with FFX™ driver

STMicroelectronics 

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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