Adaptive high pass filter having cut-off frequency controllable

Details Adaptive high pass filter having cut-off frequency controllable Adaptive high pass filter having cut-off frequency controllable

1990-01-04

1992-02-25

Isen, Forester W.

Electrical audio signal processing systems and devices

Including frequency control

333 28T, H03G 500

Patent

active

050919563

ABSTRACT:
An adaptive high pass filter comprises a switched capacitor filter (11) operable as a high pass filter, detecting circuits (14, 15, 16) for detecting low frequency signal components included in an input signal (V.sub.i) and control circuits (17, 18, 19) for controlling the switched capacitor filter (11) responsive to the detecting circuits. In this adaptive high pass filter, a cut-off frequency thereof is controlled responsive to low frequency signal components of the input signal. Therefore, a reproduced voice is not varied dependent upon changes in a quality of voice and surrounding environments. Thus, the reproduced voice is much closer to its original voice.

REFERENCES:
patent: 4498055 (1985-02-01), Dolby
patent: 4507791 (1985-03-01), Gundry
patent: 4700361 (1987-10-01), Todd et al.
patent: 4701722 (1987-10-01), Dolby
patent: 4790018 (1988-12-01), Preves

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