Telecommunications – Transmitter and receiver at separate stations – Having diverse art device
Patent
1996-10-30
1999-11-02
Chin, Wellington
Telecommunications
Transmitter and receiver at separate stations
Having diverse art device
455553, 455557, 455575, 455351, H04B 138
Patent
active
059786582
ABSTRACT:
In known portable analog communication devices, even when a data signal is dealt with, the signal is always passed through a band-pass filter designed for filtering a voice signal and thus the data signal encounters an error due to group delay distortion. A portable analog communication device includes: an RF demodulator for demodulating a received RF signal; a first filter for filtering the output signal of the RF demodulator; a second filter having a low group delay; filter connection means for selecting the second filter when the RF signal is a data signal; and device selection means for selecting a device the output signal of the signal processing circuit is provided to depending on whether the RF signal is a voice signal or a data signal.
REFERENCES:
patent: Re31510 (1984-01-01), Carbrey
patent: 3718767 (1973-02-01), Ellis
patent: 4546212 (1985-10-01), Crowder, Sr.
patent: 4817192 (1989-03-01), Phillips et al.
patent: 4903292 (1990-02-01), Dillon
patent: 5121009 (1992-06-01), Braathen
patent: 5557647 (1996-09-01), Kushige et al.
Chin Wellington
Mitsubishi Denki & Kabushiki Kaisha
Sobutka Philip J.
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