Modulator capable of decreasing consumption of electric power

Details Modulator capable of decreasing consumption of electric power Modulator capable of decreasing consumption of electric power

1994-04-12

1995-07-04

Mis, David

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375296, 375308, H03C 300, H04L 2700

Patent

active

054304156

ABSTRACT:
In a modulator supplied with an input digital signal for outputting an output signal therefrom in accordance with the input digital signal, the modulator has a first producing section for producing a phase information signal on the basis of the input digital signal. The phase information signal is representative of phase information of the input digital signal. A memory section memorizes an impulse response data of the phase information that has a predetermined data length. An accessing section accesses the memory section to produce impulse response values of the impulse response data in accordance with the phase information signal. A second producing section produces a modulated signal on the basis of the impulse response values. A shaping section shapes the modulated signal into a shaped modulated signal in accordance with a predetermined window function to produce the shaped modulated signal as the output signal.

REFERENCES:
patent: 4229821 (1980-10-01), de Jager et al.
patent: 4736389 (1988-04-01), Debus, Jr. et al.
patent: 4737969 (1988-04-01), Steel et al.
patent: 4764940 (1988-08-01), Paneth et al.
patent: 4901333 (1990-02-01), Hodgkiss
patent: 5177455 (1993-01-01), Bennett
patent: 5319676 (1994-01-01), Van Dasler et al.
H. Suzuki, et al. "Digital Implementation of Orthogonal Modulator for FM", IEICE Technical Report, No. CS79-250, pp. 31-36, 1979. (no month).

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