Equalizer and audio device using the same

Details Equalizer and audio device using the same Equalizer and audio device using the same

1994-10-11

1996-06-25

Kuntz, Curtis

Electrical audio signal processing systems and devices

Including frequency control

Having automatic equalizer circuit

381 98, 333 28T, H03G 500, H03H 500

Patent

active

055307698

ABSTRACT:
An equalizer includes: a first attenuating circuit which receives an input signal and a first control signal and attenuates the input signal depending on the level of the first control signal; a filter having a predetermined frequency band which receives the output from the first attenuating circuit; an adding circuit which receives the output from the filter and the input signal so as to add the both and outputs the adjusted audio signal; a second attenuating circuit which receives the adjusted audio signal from the adding circuit and a second control signal, attenuates the adjusted audio signal depending on the level of the second control signal and sends out a phase inverted signal of the attenuated signal to the filter; wherein when a sound quality adjusting signal representing a sound quality emphasis is received, the first control signal having a level corresponding to the emphasis condition is generated and when a sound quality adjusting signal representing a sound quality attenuation is received, the second control signal having a level corresponding to the attenuation condition is generated.

REFERENCES:
patent: 4130727 (1978-12-01), Kates
patent: 4739514 (1988-04-01), Short et al.

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