FM modulator

Details FM modulator FM modulator

1987-06-22

1989-03-28

Wan, Gene

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331 23, H03C 309

Patent

active

048167819

ABSTRACT:
Circuitry for producing an extremely linear frequency modulated audio carrier for use in the head end 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.

REFERENCES:
patent: 4707670 (1987-11-01), Dalcin

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