Accession Number:

ADA021239

Title:

Speech Evaluation. Volume I

Descriptive Note:

Annual rept. FY 1975

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s):

• Gold, Bernard

Report Date:

1975-06-30

Pagination or Media Count:

72.0

Abstract:

Two broad categories of work are described algorithmic studies and hardware design. Several algorithms for digitizing and reducing the data rate of speech signals are described. These algorithms include an adaptive residual coder ARC designed to produce data at 16 and 9.6 kbps, an adaptive predictive coder APC at 8 kbps, a voice-excited linear predictor VELP at 8 kbps, and a straight linear predictive coded LPC vocoder at 2.4, 3.6, and 4.8 kbps. In addition, some work on pitch or excitation extraction is described. All these studies are evaluated on a realtime facility which is described. In the hardware design area, the digital voice terminal is described in detail, as well as some follow-on next-generation LSI studies. Volume II will contain a digital voice terminal DVT manual, program listings, and a cross assembler.

Descriptors:

• *VOICE COMMUNICATIONS
• ALGORITHMS
• ANALOG TO DIGITAL CONVERTERS
• CODERS
• CODING
• COMMUNICATION TERMINALS
• DATA RATE
• DIGITAL SYSTEMS
• INTEGRATED CIRCUITS
• MINICOMPUTERS
• PITCH DISCRIMINATION
• SIGNAL PROCESSING
• SPEECH COMPRESSION
• VOCODERS

Subject Categories:

• Voice Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE