Modulators – Frequency shift keying modulator or minimum shift keying...
Patent
1996-11-22
1998-05-12
Mis, David
Modulators
Frequency shift keying modulator or minimum shift keying...
332103, 332117, 332144, 375303, 375308, 455 42, 455110, H03C 300, H04L 2712, H04L 2720
Patent
active
057511985
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
"Communication Systems Engineering", p. 331, by J.G. Proakis, et al. Prentice Hall, 1994.
Miyamoto Ryoichi
Yoshida Tatsumasa
Mis David
OKI Electric Industry Co., Ltd.
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