Accession Number:

ADA141291

Title:

The Lincoln Low-Rate Vocoder: A 1200/2400 bps LPC-10 Voice Terminal

Descriptive Note:

Technical rept.

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s):

• Paul, Douglas B.

Report Date:

1984-03-21

Pagination or Media Count:

35.0

Abstract:

The following is a description of a low data rate voice terminal. The unit uses an LPC-10 algorithm which provides a 2400 bps NATO standard compatible mode and a 1200 bps frame-fill mode. The unit has an RS-449 digital interface with MIL-STD-188-114 levels. The user operates the unit from a telephone instrument with a PTT handset. The user interface models an augmented combination of an FM transceiver and a telephone to inform the user of the state of the data communications equipment in a natural manner. These protocols cover the full and half duplex channels. The unit exhibits a DRT intelligibility score of 91.1 at 2400 bps and 88.7 at 1200 bps in benign acoustic environments. Author

Descriptors:

• *VOICE COMMUNICATIONS
• *VOCODERS
• *COMMUNICATION TERMINALS
• ALGORITHMS
• INTERFACES
• FREQUENCY MODULATION
• COMMUNICATION EQUIPMENT
• ACOUSTICS
• DATA RATE
• LOW RATE
• TRANSMITTER RECEIVERS
• INTELLIGIBILITY
• TELEPHONE RECEIVERS

Subject Categories:

• Voice Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE