Apparatus for quickly capturing cordless telephone channel to be

Details Apparatus for quickly capturing cordless telephone channel to be Apparatus for quickly capturing cordless telephone channel to be

1994-05-19

1996-09-10

Bost, Dwayne D.

Telephonic communications

Audio message storage, retrieval, or synthesis

455 671, 4552261, H04Q 738

Patent

active

055555527

ABSTRACT:
An apparatus capable of quickly capturing a channel to be measured of a cordless telephone in a shorter period of time than the time required by a conventional apparatus. After the waves received within all channels are converted in respect of their frequencies by a frequency converter, those out of the band are eliminated by an all-channel band pass filter. The waves outputted from the filter are amplified by an intermediate frequency amplifier and then inputted to a counter circuit. Since magnitude of the amplitude of the signal in the received channel to be measured is two or three times as large as that of interference waves, the counter circuit outputs a value within (the frequency of the channel to the measured).+-.(a half of the frequency between channels), The data processing unit determines the channel to be measured closest to the count value and makes the oscillation frequency from a local oscillator conform to the frequency corresponding to the captured channel by means of a frequency control unit.

REFERENCES:
patent: 4348772 (1982-09-01), Leland et al.
patent: 4903328 (1990-02-01), Ichikawa
patent: 4932072 (1990-06-01), Toko
patent: 4982165 (1991-01-01), Lowenschuss
patent: 5101509 (1992-03-01), Lai
patent: 5107522 (1992-04-01), Kitayama et al.
patent: 5115515 (1992-05-01), Yamamoto et al.
patent: 5337051 (1994-08-01), Tsu
patent: 5388125 (1995-02-01), Toda et al.

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