Ntt Mobile Communications Network, Inc.

Hirohumi Nakayama

Koichi Sawai

Multiplex transmission apparatus on the transmitting side multiplexes received signals from non-voice signal input output apparatus and voice signal input output apparatus , and also transmits the multiplexed signal from communications network by digital portable telephone on the transmitting side. The digital portable telephone transmits a signal per 20 msec, so that multiplex transmission apparatus alternately transmits the voice signal and the non-voice signal at an interval of 20 msec, for example. Multiplex transmission apparatus sorts out the voice signal and the non-voice signal from the supplied signal by checking the error detecting code of the supplied signal. Multiplex transmission apparatus can judge the type of the signal according to the type of the error detecting code, because a different error detecting code is added to each signal.

Receiving apparatus, receiving method, transmission system and transmission method

Multiplex transmission apparatus 10 on the transmitting side multiplexes received signals from non-voice signal input output apparatus 14 and voice signal input output apparatus 16, and also transmits the multiplexed signal from communications network 30 by digital portable telephone 12 on the transmitting side. The digital portable telephone transmits a signal per 20 msec, so that multiplex transmission apparatus 10 alternately transmits the voice signal and the non-voice signal at an interval of 20 msec, for example. Multiplex transmission apparatus 20 sorts out the voice signal and the non-voice signal from the supplied signal by checking the error detecting code of the supplied signal. Multiplex transmission apparatus 20 can judge the type of the signal according to the type of the error detecting code, because a different error detecting code is added to each signal.

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Tokyo, Japan

Hirohumi Nakayama