To provide a transmission circuit for signal processing, which does not conventionally exist, by applying a Dirac equation to a circuit theory and utilizing characteristics to be generated since the Dirac equation does not satisfy the unitarity.

Effective power to be consumed by a load resistor RR becomes larger than the maximum available power of a power source E and the transmission circuit itself is made to behave like an amplifier by using a Dirac operator of which the characteristic resistance R0f of a progressive wave and the characteristic resistance R0b of a backward wave on a transmission line have different values as a circuit element and constituting the transmission circuit so as to satisfy (the characteristic resistance R0f of the progressive wave > the characteristic resistance R0b of the backward wave) and (an internal resistance RG of the power source E > the characteristic resistance R0b of the backward wave), or (the characteristic resistance R0f of the progressive wave < the characteristic resistance R0b of the backward wave) and (the internal resistance RG of the power source < the characteristic resistance R0b of the backward wave).