Tone control of the operational type

Details Tone control of the operational type Tone control of the operational type

1980-09-11

1983-05-03

Popek, Joseph A.

H04R 300

Patent

active

043821588

ABSTRACT:
A tone control circuit for use in audio equipments includes an attenuating high pass filter (typically, a CR filter), an attenuating low pass filter, a boosting high pass filter, a boosting low pass filter and at least an operational amplifier for tone control. The high pass filters extract a treble component from an audio input signal for emphasizing or attenuating treble response, whereas the low pass filter extract a bass component of the audio input signal for emphasizing or attenuating bass response. The mid-range component of the audio input signal prevented from entering the filters by virtue of a bypass circuit interposed between a source of the audio input signal and the operational amplifier.

REFERENCES:
patent: 3816661 (1974-06-01), Huszty et al.
patent: 3950711 (1976-04-01), Ohkawa

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