Apparatus for producing audio and visual signals for modulating

Details Apparatus for producing audio and visual signals for modulating Apparatus for producing audio and visual signals for modulating

1984-05-17

1986-10-28

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358198, 331108R, 331116R, 331177V, 332 16T, 332 26, H04N 704

Patent

active

046202269

ABSTRACT:
A television signal generator for producing a composite RF signal without high level intermodulation products. A signal network is provided to linearly combine a first video modulated carrier signal and a second carrier frequency of the same frequency modulated with an audio modulated subcarrier. An audio subcarrier generator is disclosed having a ceramic resonator for a frequency determining circuit element. The resonator is parallel connected with a voltage sensitive reactance element to provide a frequency modulated subcarrier in response to a modulating voltage.

REFERENCES:
patent: 3581240 (1971-05-01), Enderby
patent: 3995233 (1976-11-01), Waku
patent: 4054794 (1977-10-01), Laughlin et al.
patent: 4088968 (1978-05-01), Pradal et al.
patent: 4442415 (1984-04-01), Ashida
patent: 4546387 (1985-10-01), Glaab
Data Sheet, "National Semiconductor LM 1889 TV Video Modulator", pp. 11-28 thru 11-36.

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