An investigation of methods of improving the intelligibility of audio-frequency speech in noise
Huddy, Norman Walter
Ewing, Gerald D.
MetadataShow full item record
A discussion of the nature of speech is presented, followed by a review of speech processing to date, with emphasis on the characteristics of speech which must be retained for intelligibility. Methods of measuring speech intelligibility are described. The relative merits of abrupt and gradual audio clipping of speech are investigated, and two tone and articulation test results are presented showing that there is no significant difference in these methods of clipping with respect to speech intelligibility. Processing of speech to radio frequencies, filtering and retranslat ion to audio to improve the peak to average value ratio of the audio frequency prior to transmitting it through a noisy channel is investigated. Two tone and articulation test results are presented showings, that this processing results in a 20% improvement in speech intelligibility over audio clipping and filtering.
Approved for public release; distribution unlimited.
Showing items related by title, author, creator and subject.
Dietrich, William Varner (Monterey, California. U.S. Naval Postgraduate School, 1966-12);Peak clipping is a well known method of increasing the average power of a peak power limited voice communication transmitter. Although the clipping process introduces distortion, articulation tests have shown that clipped ...
A double-sideband radio-frequency speech processor for increasing the intelligibility of speech signals over noisy single-sideband channels Belanger, Raymond Louis (Monterey, California; Naval Postgraduate School, 1971-09);The intelligibility of speech transmitted over noisy Single-Sideband channels can be increased by improving the average-to-peak ratio of a speech waveform while generating as few distortion products as possible. Previous ...
Intermodulation distortion: a controllable parameter in the analysis of the intelligibility of clipped speech Lannes, William Joseph (Monterey, California. U.S. Naval Postgraduate School, 1966-05);Until the experiments conducted on Single Sideband speech clipping in the early 1960's, very little work had been done in the field of conventional speech processing or clipping since the late 1940's. Although the SSB ...