Radio communication apparatus for use in dual-mode radio communi

Details Radio communication apparatus for use in dual-mode radio communi Radio communication apparatus for use in dual-mode radio communi

1998-01-21

2000-04-11

Urban, Edward F.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455569, 4552001, 381107, H04B 140

Patent

active

06049722&

ABSTRACT:
A dual mode radio communication apparatus according to the invention has a reception speech signal output circuit for processing an analog demodulation signal in an analog mode and a digital demodulation signal in a digital mode by means of a common signal processing circuit, thereby outputting reception speech signals, respectively. In the dual mode radio communication apparatus, a level variable circuit is provided across a signal path extending between a demodulated signal input terminal of a reception speech signal output circuit and a speaker. The level variable circuit determines whether the analog mode or the digital mode is set as the radio communication mode. If the analog mode is set, the gain of the level variable circuit is set to a first value for compensating for a level deviation in the analog demodulation signal. If the digital mode is set, the gain of the level variable circuit is set to a second value for preventing excessive suppression of the digital demodulation signal.

REFERENCES:
patent: 4363001 (1982-12-01), Suzuki et al.
patent: 4987599 (1991-01-01), Most et al.
patent: 5428664 (1995-06-01), Kobayashi
patent: 5450618 (1995-09-01), Naddell et al.
patent: 5493693 (1996-02-01), Tanaka et al.
patent: 5550893 (1996-08-01), Heidari
patent: 5771464 (1998-06-01), Umemoto et al.

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