ANALYSIS AND EVALUATION OF SPEECH PCM AND DIFFERENTIAL PCM SYSTEMS USING VARIOUS LOGARITHMIC AND EXPONENTIAL QUANTIZERS,

reportActive / Technical Report | Accession Number: AD0703722 | Need Help?

Abstract:

The report presents a theoretical analysis and computer simulations of differential PCM and PCM systems used for speech signals. The simulations were performed in real time on an Adage AGT-10 hybrid computer using a speech sentence as input. The quantizers used were either logarithmic or exponential. The performance of the systems with varying amounts of companding were compared. The performance metric used in theoretical derivations and in the computer simulations is the signal to quantizing noise power ratio. Three, four, five, and six bit PCM and differential PCM systems were simulated and compared. Logarithmic quantizers with low-mu were found to be superior to exponential quantizers. At any given bit rate differential PCM was superior to PCM. Author

Author(s):
Photiades, Stefanos L.
Author Organization(s):
NORTH CAROLINA STATE UNIV RALEIGH DEPT OF ELECTRICAL ENGINEERING
Supplementary Note:
Report on Project THEMIS.
Pagination:
0076

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFOSR-70-0901TR
Contract/Grant Number(s):
F44620-69-C-0033
Project Number(s):
AF-7921
Monitor Series:
70-0901TR
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*VOICE COMMUNICATIONS, *PULSE CODE MODULATION, SPEECH, SIGNAL TO NOISE RATIO, DIGITAL SYSTEMS, COMPUTER PROGRAMS
Field(s)/Group(s):
Voice Communications
Keyword(s):
THEMIS PROJECT, DIFFERENTIAL PULSE CODE MODULATION
Report Date:
1970 Jan 12