Multiplex communications – Duplex – Communication over free space
Patent
1994-10-28
1997-05-27
Safourek, Benedict V.
Multiplex communications
Duplex
Communication over free space
370521, 455 72, 455 84, 379 63, H04B 156
Patent
active
056338627
ABSTRACT:
In radio communication system in which single frequency simultaneous transmission and reception is performed, a speech audio signal is divided by a predetermined time interval. A transmission time and a reception time are allotted in the predetermined time. A time-compressed signal is transmitted during the transmission time, and a time-compressed signal transmitted from other transceiver is received during the reception time and it is decompressed to the original length. The transmission time and the reception time are alternately repeated to transmit and receive the audio signals substantially simultaneously by a single frequency, and the audio signal is reproduced from the received signal. When communication with a telephone set is to be established, a DTMF signal is used as a dialing signal to call the telephone set from the transceiver. The DTMF signal is time-compressed and then transmitted along with the speech signal. A transmission timing of the DTMF signal is controlled, and the generated DTMF signal is temporarily stored in a memory. When the transmission of the DTMF signal can be completed before the transmission time is switched to the reception time is determined, and if it can, the DTMF signal is read from the memory and transmitted.
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patent: 5404579 (1995-04-01), Obayashi et al.
patent: 5428601 (1995-06-01), Owen
Ohira Sakari
Sumi Fujio
Suzuki Ken'ichi
Suzuki Osamu
Fuji-Tekku Kabushiki Kaisha
Hitachi Denshi Kabushiki Kaisha
Safourek Benedict V.
Tohoku Electric Power Co. Inc.
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