TAS5705PAPR datasheet(41/71 Pages) TI

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Subchannel Preprocessing

TAS5705

www.ti.com ...................................................................................................................................................................................................... SLOS549 – JUNE 2008

The biquads are implemented in a direct form-I architecture. The direct form-I structure provides a separate delay

element and mixer (gain coefficient) for each node in the biquad filter.

The five 26-bit (3.23) coefficients for the biquad are programmable via the I2C interface.

The following steps are invovled in using a loudness biquad with the volume comprensation feature:

1. Program the biquad with a loudness filter.

2. Program 0x26 (1/G) and 0x28 (scale).

3. Enable volume compensation in register 0x0E.

Figure 47. Biquad Filter

A subchannel has three input multiplexers that can select from the bass management output, the downmix

output, or the channel-6 input multiplexer output.

Table 4. Submultiplexer Selection

Bits

Submultiplexer

Pass through channel-6 input multiplexer output

Select bass management block output for submultiplexer

Select downmix ouput for submultiplexer

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