| 摘要 |
<p>In a transmitter including a carrier source an input signal is present which contains the information to be transmitted and is composed of signal components having amplitudes less than a predetermined threshold value or equal to the threshold value and signal components whose amplitudes are less than the threshold value or equal to the threshold value. For the purpose of identification, the two signal components are sampled in different ways, for example at different frequencies and are combined into a modulation signal in such a manner that the two signal components have the same sign. In a receiver, a circuit arrangement is provided which identifies the sign of the partial signals on the basis of their different sampling frequencies, demodulates envelope curves and combines them into an output signal which corresponds to the signal. The transmitter and receiver are advantageously components of an analog optical transmission system. They prevent the clipping effect while simultaneously increasing the degree of modulation.</p> |
