Circuit Quality Monitor.
Final rept. 26 May 71-26 Mar 74,
ELECTRONIC COMMUNICATIONS INC ST PETERSBURG FLA
Pagination or Media Count:
This is the final report on the Circuit Quality Monitor program. Two advanced development models of the Circuit Quality Monitor have been built and tested. The monitor is a device which automatically measures and continuously displays the quality of voice bandwidth channels in the U.S. Army tactical toll system. Twelve channels and one self test channel are measured on a non-interfering basis once every fifteen minutes. Three degrees of quality are continuously displayed usable for data, usable for voice but not high speed data, and unusable. Quality is measured in terms of amplitude spectrum, group delay spectrum, frequency offset, and message circuit noise. Channel traffic is monitored continuously on all channels and a low level non-interfering probe signal inserted when idle or when high level data traffic exist. Long integration time constants are implemented via phase locked loops to perform measurements at high negative signal to noise ratios. The channel performance parameters, measurement technique, implementation, and test results are described.
- Voice Communications