Continuous Analysis Speech Band-Width Compression System
T. E. Bayston, S. Joseph Campanella · The Journal of the Acoustical Society of America · 1957
An investigative program conducted at Melpar under U. S. Air Force sponsorship has resulted in the development of a speech band-width compression system capable of transmitting speech within a total band width of 150 cps (as compared with 3000 cps for speech transmission by conventional means). This system consists of an analyzer which extracts from the acoustical speech signal six vocal analog control signals, a suitable transmission link, and a synthesizer which employs the control signals to reproduce the essential features of the original speech. The vocal analog control signals vary slowly in time because of natural physical constraints, and thus require considerable less transmission band width than the original acoustical signal. Articulation tests conducted on the system have resulted in scores of 67% for PB (phonetically balanced) word lists and 88% on Spondee word lists. A breadboard model of this system will be described and tape recordings of processed speech will be presented. [This work was supported by Contract AF33 (600)-3.]