Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-05-25
1986-09-09
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358198, 381 1, 381 2, 381 3, 381 17, H04N 704
Patent
active
046112260
ABSTRACT:
A processing section for a television receiver for processing stereo/dual sound signals having a first sound carrier modulated by a first sound signal, and a second sound carrier modulated both by a second sound signal and by a pilot signal which, in turn, is modulated by a stereo/dual sound identifying signal. The processing section does not require a reference frequency from the synchronizing or intermediate frequency portion of the television receiver for recovering the pilot signal, but, rather, uses the pilot signal to control an oscillator in a phase-locked loop which loop is used to generate a signal for down-converting the frequency range of at least the modulated second sound carrier thereby obviating the need for expensive, precision filtering components.
REFERENCES:
"Integrierbarer Ton-ZF-Teil eines Fernsehempfangers"; Funk-Technik, 1966, No. 19, pp. 680-682 by H. Mosel.
"Zwei-Kanel-Fernsehton"; Funkschau, 2/1982, pp. 76-79.
Data Sheet on the TDA 4940 FM IF Amplifier with Pilot Tone Decoding for TV Stereo Application, marketed by Siemens, pp. 513-519.
Buhse Ulf H.
Kuhn Hans-Jurgen
Briody Thomas A.
Goodman Edward W.
Groody James J.
Parker Michael D.
Streeter William J.
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