Variable frequency characteristic circuit for a vehicular sound

Details Variable frequency characteristic circuit for a vehicular sound Variable frequency characteristic circuit for a vehicular sound

1986-10-16

1989-07-18

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330107, H03F 345, H03F 136

Patent

active

048497096

ABSTRACT:
A variable frequency characteristic circuit to be used in compensating the frequency characteristics in an audio device in a vehicle. A single operational amplifier is used. Different resonance circuits of different frequencies are connected from ground to either the inverting or non-inverting inputs in order to provide local peaks and dips. Two variable resistors are connected in parallel between the inverting and non-inverting inputs. Different resonance circuits of different frequencies are connected from ground to center taps of the variable resistors to provide treble and base control.

REFERENCES:
patent: 4553103 (1985-11-01), Rollett

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