| 摘要 |
PURPOSE:To obtain redundancy, to prevent a malfunction due to a calling signal and to execute the transmission without any problem in a calling band by spectrum-spreading a ringer signal, an original signal, in the frequency direction and holding a constant law for the spreading. CONSTITUTION:By multiplying and integrating a certain period signal alpha(t) as a carrier instead of an exp (j2pifct) to an original signal a(t) at a transmission side, a transmission signal s(t) is generated. By using a beta(t) in which a dummy reverse function beta(t), namely, alpha(t) and beta(t), to the period signal alpha(t) comes to be identically 1 at least in a signal band and executing the multiplying, integrating and demodulating it at the receiving side, the original signal a(t) is restored. By paying attention to the fact that both alpha(t) and beta(t) are period functions having the same period, when the period is Tp, for the alpha(t) and beta(t), Fourier series development can executed as the signal composed of the basic wave of 1/Tp(Hz) and the higher harmonic wave, and the communicating system can be modelled as one kind of a multi-channel parallel transmission system (channel number M (integer)). |
