Tone control device

Details Tone control device Tone control device

1979-11-28

1981-06-02

Gensler, Paul L.

Wave transmission lines and networks

Coupling networks

Equalizers

330 84, 330 85, 330126, H03H 703, H03H 1106, H04B 304

Patent

active

042713986

ABSTRACT:
A tone control circuit device including a plurality of bandpass filters connected in parallel with one another with each of the bandpass filters having a different center frequency and each being variable in order to vary the tone as in a graphic equalizer. In one embodiment, the output signals from the bandpass filters are coupled both to non-inverting input terminals of output and input signal summers. The input signal is coupled to another input of the input signal summer and the combined signals coupled to inputs of each of the bandpass filters and to a non-inverting terminal of the output signal summer. In another embodiment, plural characteristic circuits, each including a band-stop filter, are connected in parallel between input and output signal summers through a disclosed amplifier network. With this invention, a graphic equalizer tone control device can be constructed which is essentially free from noise and which has a very low distortion factor.

REFERENCES:
patent: 3624539 (1971-11-01), Kao et al.
patent: 3771071 (1973-11-01), Delfrate
patent: 3921104 (1975-11-01), Gundry

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