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Frequency-shift-signal-receiver

Antenna system and method thereof

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OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a frequency modulation (FM) receiver 1 connected ...

Method of and apparatus for message communication on Loran-C navigational signal broadcasts and the like with reduced navigation errors

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Spreader application rate monitoring device

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Process for producing titanium tetrachloride

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Control system for limiting the electrical consumption of a distribution network

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Method of checking interference on process pattern caused by tool positioning

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Communication apparatus

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Spread aloha CDMA data communications

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Frequency shift signal receiver

Details

Inventors: Kubo, Noriyoshi; Katano, Takeshi; Tatsuzawa, Yoshinobu; Hagihira, Tadatoshi; Yamamoto, Masahiko; Wasai, Hiromi;
Assignee: Nippon Telegraph and Telephone Public Corp. (Tokyo, JP); Matsushita Electric Industrial Co., Ltd. (Kadoma, JP)
Primary Examiner: Safourek; Benedict V.
Assistant Examiner: Masinick; Michael A.
Attorney, Agent or Firm: Stevens, Davis, Miller & Mosher

A frequency shift receiver for periodically receiving frequency shift (FS) signals while cyclically turning on and off a power supply for a preceding section of the receiver. An output from the discriminator is turned on and off in synchronism with the turning on and off of the power supply to prevent noise even when a frequency difference exists between the transmitter and receiver.

DETAILED DESCRIPTION The present invention improves the prior art discriminator circuit by providing a further switching means to turn on and off the output of the discriminator in synchronism with the cyclic operation of the preceding section of the receiver such that the coded signal can be correctly received even when a frequency drift exists and any noise which may possibly exist can be eliminated.
The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of a preferred embodiment of the invention when taken in conjunction with the accompanying drawings.

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