Delta Modulation Conferencing System.
Abstract
This report describes a Delta Modulation Conferencing unit and Delta Modulator-Demodulator units which were constructed under this contract. The conferencing unit is based on a technique for combining a number of delta modulation speech signals into a single bit stream which, in effect, represents the sum of all the input speech signals. Thus any participant can hear all the participants even when a number are speaking at the same time. The system is a relatively simple one in which the processing can be completely digital, and does not involve recovery of the original speech signal. The technique takes advantages of the statistical property of a delta modulation voice signal that adjacent bits differ about 90% of the time and are the same only about 10% of the time.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1978
- Accession Number
- ADA067646