FM modulation system using quadrature modulator

Details FM modulation system using quadrature modulator FM modulation system using quadrature modulator

1998-08-19

2000-06-06

Kinkead, Arnold

Modulators

Frequency modulator

332117, 332103, 455102, 455110, 455553, 375216, H03C 300, H04L 2732

Patent

active

060723742

ABSTRACT:
The invention provides a FM modulation system using a quadrature modulator, wherein a circuit for exclusive use in FM modulation and a change-over means can be dispensed with. In this system, modulating signals are inputted to a baseband signal processing circuit, converted into digital signals after integration, and turned into an analog signal by reading out a sine wave signal pre-stored in a sin ROM, thereby generating a baseband signal I for an equi-phase signal and a baseband signal Q for a quadrature signal. By adding together results of multiplication of the baseband signal I for the equi-phase signal and the baseband signal Q for the quadrature signal by a local signal of cosine and a sine wave signal obtained by phase shifting the local signal through 90 degrees, respectively, a quadrature modulation signal containing a FM modulated signal and the maximum frequency deviation can be generated.

REFERENCES:
patent: 4540958 (1985-09-01), Neyens et al.
patent: 5111163 (1992-05-01), Erlich
patent: 5787362 (1998-07-01), Matero

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