Accession Number:

AD0600185

Title:

SPECTRA OF VOCODER CHANNEL SIGNALS

Descriptive Note:

Group rept.

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s):

• Rader, C. M.

Report Date:

1964-05-04

Pagination or Media Count:

23.0

Abstract:

A channel vocoder derives the short time magnitude spectrum of speech by passing the speech through a set of analyzing channels, each consisting of a band pass filter followed by an envelope detector and a low pass filter. Each channel produces a slowly varying output signal which represents a short term average of the speech energy in the corresponding frequency band. The measurement of the power spectra of these signals is described herein. It appears that these signals may be thought of as band limited to 25 cps.

Descriptors:

• *VOICE COMMUNICATIONS
• *SPEECH COMPRESSION
• BANDPASS FILTERS

Subject Categories:

• Voice Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE