Accession Number:

AD0627589

Title:

A 1000 BIT PER SECOND SPEECH COMPRESSION SYSTEM,

Descriptive Note:

Corporate Author:

MELPAR INC FALLS CHURCH VA

Report Date:

1963-01-01

Pagination or Media Count:

5.0

Abstract:

The system exploits the speech bandwidth compression capabilities of the method known as formant tracking to provide digitized communication of speech at a rate of 1000 bits per second. The system derives a set of seven parameters from the original speech signal which contain the essential word content information of speech. The seven parameters consist of three formant frequencies, three formant intensities and the frequency of pitch. In their analog form they occupy 140 cps of bandwidth. The parameters are digitized into a 23 bit code word that is sampled at a 43.5 cps rate to provide a 1000 bit per second serial digital stream. At the receiving end of the system the serial binary stream is decoded and converted to synthetic speech. A discussion of the information theory of speech compression systems is included with the conclusion that the system will possess a 13db signal to noise advantage over conventional uncompressed speech transmission systems, an advantage that will result in significant size, weight and power requirements reduction. Author

Subject Categories:

  • Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE