Variable digital high and low pass filters

Details Variable digital high and low pass filters Variable digital high and low pass filters

2007-03-13

2007-03-13

Mei, Xu (Department: 2615)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Digital audio data processing system

C708S300000

Reexamination Certificate

active

10326517

ABSTRACT:
A system (10) for providing an integer number N of filters. The system comprises an input (Di) for receiving a digital audio signal and an output (Do) for providing a filtered audio signal. The system also comprises circuitry (16) for storing at least a first set of fixed filter coefficients and circuitry for storing estimation data. The system also comprises circuitry (14) for estimating a number of sets of estimated filter coefficients in response to the estimation data and the fixed filter coefficients. The system also comprises circuitry (14) for applying a transfer function to the digital audio signal and in response for providing the filtered audio signal. The circuitry for applying the transfer function applies a set of filter coefficients selected from the first set of fixed filter coefficients and the sets of estimated filter coefficients. Also, the transfer function is selected from a transfer function set consisting of a high pass filter transfer function and a low pass filter transfer function.

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