Discriminator apparatus for detecting the presence of a signal b

Details Discriminator apparatus for detecting the presence of a signal b Discriminator apparatus for detecting the presence of a signal b

1980-01-17

1983-01-11

Olms, Douglas W.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

179 1GN, 455 71, 328138, 358144, H04H 500, H04N 700

Patent

active

043683541

ABSTRACT:
A discriminator apparatus for a television multivoice system comprises a mixer for mixing a program identifying signal with a reference signal thereby to produce a differential beat signal. A reference signal generator includes a signal source of an original frequency, and a frequency converter for converting the original frequency to the reference frequency which is close to the frequency of the program identifying signal and so selected that the frequency of the differential beat signal is lower than the lowest audible frequency. A low-pass filter is employed for extracting the differential beat signal. Need for expensive mechanical filters of a narrow fractional bandwidth is thereby eliminated.

REFERENCES:
patent: 2965717 (1960-12-01), Bell
patent: 3566036 (1971-02-01), Roche
patent: 4048654 (1977-09-01), Wegner
patent: 4281217 (1981-07-01), Dolby

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