Title:
VIDEO SIGNAL PROCESSOR
Document Type and Number:
Japanese Patent JPH04172660
Kind Code:
A
Abstract:
PURPOSE:To accurately control carriers of a plurality of FM modulators by operating the modulators as a function of a voltage controlled oscillator (VCO) in a PLL, and operating the modulators by the PLL. CONSTITUTION:An FM modulator is composed of phase-locked loop (PLL) control type FM modulators 20, 21, and an FM modulation signal is modulated by using a clock divided in frequency by the ratio of integer multiples of a certain clock. That is, the modulator 20 (21) is composed of an FM modulator 201, a frequency divider 202 having 1/M of frequency dividing ratio, a frequency divider 203 having 1/N of frequency dividing ratio, a phase comparator 204, and a low pass filter 206 connected thereto to use the fact that the modulator 201 is operated as a function of a VCO. Thus, a difference of the carriers of the modulators is very reduced, and accurate FM modulation is performed by a simple circuit configuration.
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Inventors:
KOTANI YASUTAKA
Application Number:
JP30160690A
Publication Date:
June 19, 1992
Filing Date:
November 07, 1990
Export Citation:
Assignee:
SONY CORP
International Classes:
G11B20/06; (IPC1-7): G11B20/06
Attorney, Agent or Firm:
Takahisa Sato
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