TAS3001CPWR datasheet(10/56 Pages) TI

10 / 56 page

1−4

1.7

High-Precision, Second-Order Biquad Filter Structure

The TAS3001 has six cascaded biquad filters for the left and right channels to permit parametric equalization and

filtering of the input signal. Each biquad is able to specify a wide variety of first- and second-order filter types, including

high-pass, low-pass, band-pass, band-block, notch, and all-pass filter types. Examples of a few of the filters that can

be implemented by the TAS3001 shapes are illustrated in Figure 1−2 though Figure 1−6.

−20

−15

−10

−5

f − Frequency − Hz

ATTENUATION

FREQUENCY

100

10k

Figure 1−2. Examples of High-Pass Filters

Figure 1−3. Examples of Equalization Filters

−15

−10

−5

f − Frequency − Hz

ATTENUATION

FREQUENCY

100

10k

The biquad structure is of the form:

H(z)

0 )

Z–1

) b

Z–2

) a

Z–1

) a

Z–2

Coefficients are downloaded to the TAS3001 registers in 4.20 format.

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