Accession Number:

AD0755939

Title:

Digital Modulation Enhancement Study

Descriptive Note:

Final rept.

Corporate Author:

SIGNATRON INC LEXINGTON MA

Personal Author(s):

Report Date:

1973-01-01

Pagination or Media Count:

95.0

Abstract:

A new method of nonlinear modulation of analog information is described which gives a substantial improvement in performance over conventional modulation techniques, such as PCM. The modulation technique which the author has called Multistream Modulation MSMO provides the capability of designing modulation performance characteristics which can be tailored to specific needs. The theoretical concepts presented were verified by measurements made on a digital transceiver breadboard constructed during this program. The transceiver breadboard included both the MSM and PCM systems. This enables voice experiments to be conducted with the transceiver which provided instantaneous switching from PCM to MSM. The informal voice tests which were carried out showed that the predicted and measured threshold extension over PCM was also obtained with voice communication.

Subject Categories:

  • Cybernetics
  • Voice Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE