Abstract
Methods and techniques of (1) audioband (AB) clipping, (2) single side band (SSB) clipping, (3) double side band (DSB) clipping, and (4) partial band (PB) clipping both with and without control, will be explained and discussed in relation to distortion, intelligibility, and power gain. Assuming constant power gain, the above methods are arranged in order of increasing understandability and decreasing distortion, provided they are not further distorted during transmission. If the signal is influenced by fading, Doppler effects, or atmospheric disturbances during transmission, the modulation envelope becomes the important factor. For a rectangular modulating signal the resulting envelope will also be rectangular in AB and DSB. It is related to the shape of the modulating signal in SSB and PB but it is no longer rectangular. To suppress transmission distortions, clipping at the receiver can only be used in AB and DSB, for it would introduce additional distortion in SSB and PB. When distortion in transmission is considered, the various methods of clipping will be rank-ordered in a different sequence.
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