Voice-protected, frequency-selective signal receiver

Details Voice-protected, frequency-selective signal receiver Voice-protected, frequency-selective signal receiver

1978-03-15

1980-02-05

Konick, Bernard

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 78D, H04M 150, G01R 2314

Patent

active

041874030

ABSTRACT:
A voice-protected, frequency-selective signal receiver for signals which consist of several simultaneously occurring individual frequencies, includes circuits for converting the received analog sum signal into a beat pulse pattern of positive and negative pulses of equal amplitude. The time interval between two pulses of identical operational signal and identical duration is determined, since this time interval corresponds to the duration of the sum signal and thus represents a clear criterion for the signal to be received. The signal receiver is utilized to advantage in multi-frequency code receivers in telecommunication systems, particularly telephone systems.

REFERENCES:
patent: 3537001 (1970-10-01), Friend

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