Angular modulator with a phase variation divided and integrated

Details Angular modulator with a phase variation divided and integrated Angular modulator with a phase variation divided and integrated

1998-04-30

1999-05-18

Mis, David

Modulators

Frequency shift keying modulator or minimum shift keying...

332103, 332117, 332144, 375303, 375308, 455 42, 455110, H03C3/00

Patent

active

059054131

ABSTRACT:
A digital modulator capable of obtaining a high FM modulation index and reducing the quantization noise without increasing the sampling frequency of an A/D converter of input voice. A phase variation .phi.(Ts) of the digital data (Ts is the sampling period) produced on the basis of the output from the A/D converter is divided by a predetermined integer N (N>1) by a divider, and is fed to an integrator. The integrator integrates the divided phase variation .phi.(Ts)/N for every time interval Ts/N, thereby producing a phase component .phi.(t) of the complex envelope of the modulation signal. The phase component .phi.(t) is resolved into cosine and sine components at the time interval Ts/N. The cosine and sine signals are D/A converted into analog signals which are quadrature modulated by a quadrature modulator.

REFERENCES:
patent: 4562414 (1985-12-01), Linder et al.
patent: 5091705 (1992-02-01), Hiramatsu et al.
patent: 5224119 (1993-06-01), Barabash et al.
patent: 5412352 (1995-05-01), Graham
patent: 5751198 (1998-05-01), Yoshida et al.

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