| 摘要 |
Method of reducing the bandwidth of communication signals to suppress data signals considered insignificant as being only slightly different from preceding signals, and transmitting a constant quantity of data each time interval. The significant or relative data signal values are selected out of the input data signals by transforming the input data input signal,e.g.by forming the difference between successive or adjacent scanning values, determining the frequency distribution of the amplitudes of the transformed signal within a given time interval to provide a control signal whose value depends on the frequency distribution and comparing the control signal with the input data signal, which has been delayed by the given time interval, to provide an output signal whenever the control signal is exceeded.
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