Filter circuit and audio signal processor provided therewith

Details Filter circuit and audio signal processor provided therewith Filter circuit and audio signal processor provided therewith

1997-07-25

1999-09-14

Isen, Forester W.

Electrical audio signal processing systems and devices

Including frequency control

Automatic tone control

381120, 381121, 327554, 330109, 330260, H03G 900, H03B 100

Patent

active

059534303

ABSTRACT:
A filter circuit adjustably decreases or increases the amplitude of audio signals in a predetermined frequency range. The filter circuit includes a filter module having an RC network with at least one frequency-response-determining RC member whose resistor component R is realized in SC technology. A setting device is connected to the filter module such that its setting determines the frequency response of the SC filter. The setting device renders possible a neutral setting in which the effective audio signal path of the filter circuit circumvents the filter module so that no decrease or increase of the amplitude of individual frequency portions takes place. Furthermore, an audio signal processor comprises at least one audio signal input, at least one audio signal output, and at least one control input. The audio signal processor also comprises an audio signal processing unit connected between the audio signal input and the audio signal output, with the audio signal processing unit having at least one such filter circuit.

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