Patent ID: 7949519

Claim:
An information communication apparatus comprising: a transmission apparatus transmitting both audible sound signals and information signals via a transmission path; and a receiving apparatus, wherein the transmission apparatus comprises: a pair of channels for transmitting audible sound signals; a low-pass filter which is provided with regard to each of said two channels and which inputs signals passing through the channels; a high-pass filter which is provided with regard to each of said two channels and which inputs signals passing through the channels; a first mixer which synthesizes the signals from said two channels after passing through the high-pass filter; a pair of amplifiers which controls a gain and which inputs the synthesized signals; an amplifier control signal generation section complementarily controls the gains of the amplifiers in accordance with a machine operation control signal for controlling a machine; a second mixer which electrically synthesizes the complementarily controlled signals and the signals of the channels passed through the low-pass filter and which generates synthesized electric signals; and a transmission unit transmitting the synthesized electric signals through a transmission path, the receiving apparatus comprises: a receiving unit receiving the synthesized electric signals through the transmission path; a pair of high-pass filters inputting the synchronized electric signals with regard to each of the channels and which has approximately the same cutoff frequency as the high-pass filters of the transmission apparatus; and a comparator conducting a comparing operation between the signals of said two channels after passing through the high pass filters and extracting said machine operation control signals based on a comparison result, and the machine is controlled based on the a machine operation control extracted signals.