Audio signal discriminator circuit

Details Audio signal discriminator circuit Audio signal discriminator circuit

1977-05-11

1979-01-09

Heyman, John S.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307353, H03K 520

Patent

active

041340329

ABSTRACT:
An audio signal discriminator circuit wherein the discrimination of audio signal is effected by utilizing the difference in peak level changing mode between audio signals and other signals, such as dial tone signals, beep tone signals and the like, comprises a rectifier circuit for rectifying input signals, a voltage hold circuit for holding an output peak voltage of the rectifier circuit, a voltage comparator circuit for comparing the peak voltage held in the voltage hold circuit with the following peak voltages to produce an output signal when the following peak value is relatively high, a time switch for producing an output signal when no reset signal is applied thereto for a predetermined time period, and a gate circuit for transmitting the output signal of said rectified circuit as a reset pulse to the time switch in response to the output signal of the voltage comparator circuit.

REFERENCES:
patent: 3609407 (1971-09-01), Garuts
patent: 3810025 (1974-05-01), Barthelemy
patent: 3982434 (1976-09-01), McMurtrie
patent: 4028506 (1977-06-01), Araseki et al.

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