| 摘要 |
PURPOSE:To send an AV signal without provision of a special tuner by allowing each AV equipment to detect an idle channel and to decide a transmission channel. CONSTITUTION:A control signal of equipment 4a-4n connected to a home bus 2 and various and versatile information signals to be handled are subject to frequency division multiplexing. In detecting an idle channel, PLL sweep is applied at the sending side of the AV equipment 4a-4n, swept one by one channel and the channel selection frequency not in use is decided by the beat system. The decided converting channel number is used as its own address information to send the digital data at the base band. Since a PLL tuner is provided to the reception side of the other AV equipments 4a-4n, when the opposite address is coincident with its own address, the processing is applied. Since the idle channel is detected to decide the transmission channel in such a way, an AV signal is sent without provision of a special tuner. |
