Method and device for digital frequency modulation

Details Method and device for digital frequency modulation Method and device for digital frequency modulation

1998-12-21

2000-10-10

Bocure, Tesfaldet

Pulse or digital communications

Transmitters

Angle modulation

348441, 332119, H03C 300, H04N 314

Patent

active

061309192

ABSTRACT:
A method and device are adapted to perform digital frequency modulation. First, an input frequency modulation signal is converted into a digital signal via an A/D (Analog/Digit) adapter, then a varied carrier frequency parameter "a" for each different system is added to the digital signal by an adder; next, the digital signal is multiplied by a various frequency variation parameter "b" assigned to each different system accordingly, and is further multiplied by another number 2.sup.-U, U=10 for SVHS system and U=11 for VHS system, by a multiplier; afterwards, the digital signal is processed by a digital integrator; then corresponding amplitudes in mapping with all angles .theta. and .theta.' within 360 degrees are obtained by sin.theta. ROM and Cos.theta.' ROM, wherein Z.sup.-1 is a flip-flop, the parameters "a", "b" are variable corresponding to specifications of PAL, NTSC, VHS, SVHS systems and the interlace scanning so as to make the design applicable to various systems.

REFERENCES:
patent: 5566207 (1996-10-01), O'Donnell

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