RF clipping and filtering to improve the intelligibility of speech in noise

The principle of speech clipping at audio and radio frequencies has been fully investigated to determine its advantages in peak-power-limited systems in which the signal is to be transmitted through a noisy channel at radio frequencies. This paper describes the advantages of radio frequency clipping and filtering in systems in which the noise is encountered when transmitting the speech signal at audio frequencies. Articulation test results showing a 20 percent improvement in intelligibility are presented, as well as repeaking measurements to show the advantage of this method of processing speech in the type of system considered.