Information signal demodulating apparatus

Details Information signal demodulating apparatus Information signal demodulating apparatus

1989-10-23

1993-08-10

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329306, 375 84, H03K 904

Patent

active

052356205

ABSTRACT:
An information signal restoring apparatus of this invention is arranged to receive a modulated information signal formed by modulating a predetermined carrier signal in accordance with an information signal and then to restore the input modulated information signal to the original information signal. The information signal restoring apparatus is arranged to receive the modulated information signal to generate a frequency signal which is phase synchronized with a modulated information signal which is input during a first period and then to generate an information signal on the basis of the result of a phase comparison made between the frequency signal generated by the frequency signal generating means and a modulated information signal which is input during a second period different from the first period. Accordingly, it is possible to restore the modulated information signal to the original information signal stably and accurately by means of a simplified construction.

REFERENCES:
patent: 3571712 (1971-03-01), Hellwarth et al.
patent: 4320345 (1982-03-01), Waggener
patent: 4628271 (1986-12-01), Takayama
patent: 4704582 (1987-11-01), Dixon et al.
patent: 4714892 (1987-12-01), Ishizuka
patent: 4746872 (1988-05-01), Yamagata
patent: 4807251 (1989-02-01), Shibano
patent: 4847876 (1989-07-01), Baumbach et al.
patent: 4975928 (1990-12-01), Horsten

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