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Signal transmission system of power line carrier unit

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专利汇可以提供Signal transmission system of power line carrier unit专利检索,专利查询,专利分析的服务。并且PURPOSE:To improve calling quality by widening a callng band by transmitting a pilot signal for transmission and synchronization with its cycles phase-modulated by a ringer signal for telephone calling. CONSTITUTION:A transmission band superposed upon the power line of a duplex terminal equipment at the time of the transmission of a ringer signal consists of calling bands 21 and 23 and transmitting-synchronizing pilot signal cycles 22 which are used for a reception-input level supervision and sound modulation and demodulation and transmits the ringer signal. Only at the time of a phase based on pilot signal cycles 22, phase modulation is performed to make a phase difference from a reference phase correspond to the switching condition of a contact, i.e. the ringer signal, thereby superposing and sending the ringer signal for telephone calling. Namely, pilot signal cycles are phase-modulated by the ringer signal and then sent out so as to improve calling quality with a wide calling band.,下面是Signal transmission system of power line carrier unit专利的具体信息内容。

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