STA559BW datasheet(16/67 Pages) STMICROELECTRONICS

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Processing data paths

STA559BW

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DocID18190 Rev 2

Processing data paths

Figure 6 below shows the data processing paths inside STA559BW. The whole processing

chain can be considered as two consecutive sections. In the first one, dual-channel

processing is implemented and in the second section each channel is fed into the post

mixing block, either to generate a third channel (typically used in 2.1 output configuration

and with crossover filters enabled) or to have the channels processed by the dual-band

DRC block (2.0 output configuration with crossover filters used to define the cut-off

frequency of the two bands).

The first section contains a 2x oversampling FIR filter providing 2 * fS audio processing and

a selectable high-pass filter to remove the DC level (enabled if HPB = 0).

If the coefficient sets for the two channels are linked (BQL = 1) it is possible to use the

de-emphasis, bass and treble filters in a user defined configuration (provided the relevant

BQx bits are set). In this case both channels use the same processing coefficients and can

have up to seven filters each. If BQL = 0 the BQx bits are ignored and the fifth, sixth and

seventh filters are configured as de-emphasis, bass and treble controls, respectively.

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