TAS3001CPWR datasheet(37/56 Pages) TI

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8−5

Figure 8−6 shows the filters that were used to equalize the loudspeaker response.

Figure 8−6. Equalization Filters

8.5

Speaker Correction and Equalization

Digital filters are able to provide a fairly broad range of filter types and responses.

The TAS3001 contains six programmable filters. The system designer has the choice of using one to all six of these

filters. The filters can be used to equalize response peaks and dips from a desired response. They can also be used

to shape the loudspeaker phase response. Because of their available precision and temperature insensitivity, not only

can the filters be used to equalize the frequency and phase response of a loudspeaker closely, but they also can be

used to remove resonances or other small deviations in the response of a loudspeaker surgically. This permits the

system designer a greater degree of flexibility in the design of both the individual loudspeaker drivers and the cabinet.

If additional filtering is needed, multiple TAS3001s can be cascaded.

This enables greater freedom in the design of acoustical systems. The TAS3001 permits additional flexibility in

transducer design. Overall flatness of a transducer response is no longer an overriding concern with the

low-cost/high-performance frequency correction of the TAS3001. The constraints on the transducer design can be

relaxed so that they provide optimum performance after correction. This, in turn, allows the transducer and its

equalization to be designed as a system, providing wide flexibility in the design and achieving outstanding sound

presentation.

8.6

The TAS3001 Can Implement Nearly Any Second-Order IIR Filter

Filter designs can tax computational resources, so it is not uncommon to see simplified filter implementations that

must limit either the number of or the nature of the filters that can be implemented. For example, a particular

architecture might impose limits on the gains, Qs, and/or center frequencies that can be implemented. This, however,

is not the case with the TAS3001. Its high-precision, patent-pending structure allows implementation of almost any

second-order IIR filter. These are implemented in an almost limitless range of filter functions without fear of

degradation due to limit cycles or increased system noise.

Additionally, higher order filters can be developed by factoring the desired filter into consecutive multiple

second-order sections. Similarly, any filter that has been designed in analog can be converted and implemented as

a digital filter.

TAS3001CPWR Datasheet(PDF) 37 Page - Texas Instruments