Color television receiver beat frequency control using stabilize

Details Color television receiver beat frequency control using stabilize Color television receiver beat frequency control using stabilize

1975-09-17

1977-02-08

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Detail of image placement or content

325146, 332 16R, 358 36, 358197, H04N 902

Patent

active

040074803

ABSTRACT:
Interference in a television receiver due to variations in the frequency of a "920 KHz beat" frequency obtained from the difference in frequency between the 4.5 MHz intercarrier frequency and the 3.58 MHz color subcarrier frequency and detected by the receiver's video detector is reduced by using a color television transmitter having an aural oscillator using a crystal of a smaller size, an "AT" cut and higher frequency followed by frequency division of the oscillator output. The resulting output signal has improved frequency stability and is used as a basis for aural modulation in the television transmitter.

REFERENCES:
patent: 3548085 (1970-12-01), Shimada
patent: 3619806 (1969-11-01), Phillips
patent: 3836873 (1974-09-01), Healey, et al.
patent: 3854094 (1974-12-01), Towler
Principles of Color Television : "The Color Television Standards of the FCC", Copyright 1956, John Wiley & Sons, Inc., pp. 283-284, Hazeltine Laboratories Staff.

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