4.5 mhz (intercarrier) fm modulator

Details 4.5 mhz (intercarrier) fm modulator 4.5 mhz (intercarrier) fm modulator

H - Electricity

04

N

350/30

H04N 7/16 (2006.01) H03C 3/09 (2006.01) H04N 7/04 (2006.01)

Patent

CA 1289654

ABSTRACT OF THE DISCLOSURE Circuitry for producing an extremely linear frequency modulated audio carrier for use in the headend of a video signal distribution system, such as a cable television system. A reference oscillator operating at a relatively high frequency, such as the video carrier frequency, generates a signal which is divided down to a relatively low frequency. A voltage controlled oscillator operating at the relatively low frequency is used to frequency modulate the audio signal. After modulation, the audio carrier is upconverted utilizing a signal frequency which is also derived from the original reference frequency, thus providing a stable and linear frequency modulated audio carrier particularly suitable for transmission of stereo program audio.

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