Audio signal discriminator circuit

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...

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Bibliographic Details
Main Author ANDO; SHIZUO
Format Patent
LanguageEnglish
Published 09.01.1979
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TELEPHONIC COMMUNICATION
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Summary: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.
Bibliography:Application Number: US19770795843