Speech Algorithm Optimization at 16 KBPS.

reportActive / Technical Report | Accession Number: ADA092010 | Open PDF

Abstract:

This report describes the design of a 16 Kbs Split-Band Adaptive Predictive Coder SBAPC whose high quality processed speech compares favorably with that of the Continuously Variable Slope Deltamodulator CVSD in both back-to-back and simulated tactical situations. Operations of this algorithm include the partitioning of the input frequency band evenly into two subbands and the encoding of the subband waveform using Adaptive Predictive Coding APC. The results of our investigation on quadrature mirror filters, tradeoffs between various APC parameters, noise shaping techniques, and adaptive bit allocations are presented. This report also gives a detailed discussion on the utilization of noise suppression techniques in reducing stationary background noise and forward error-correcting codes in maintaining the SBAPC performance at 10 to the minus 2 channel error rate. Author

Author(s):
Cheung, R. S. ; Kwon, S. Y. ; Goldberg, A. J.
Author Organization(s):
GTE PRODUCTS CORP NEEDHAM HEIGHTS MA COMMUNICATION SYSTEMS DIV
Descriptive Note:
Final rept. Jul 79-Sep 80,
Pagination:
0259

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
DCA100-79-C-0038
 Subject Terms
Joint Capability Areas:
JCA_6_Net Centric; JCA_6.3.3_Spectrum Management; JCA_6.1_Information Transport; JCA_6.3_Net Management; JCA_5_Command and Control; JCA_5.3_Planning; JCA_1.2.5_Lessons Learned; JCA_5.4_Decide; JCA_8.2.1_Partner with Governments and Institutions; JCA_8.2_Shape; JCA_8_Building Partnerships; JCA_1_Force Support; JCA_4.3_Maintain; JCA_1.3_Human Capital Management; JCA_5.5.2_Task; JCA_5.5_Direct
Modernization Areas:
Quantum Science and Computing
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*CODING, *MATHEMATICAL FILTERS, *SPEECH ANALYSIS, OPTIMIZATION, FORTRAN, ERROR ANALYSIS, QUANTIZATION, FLOW CHARTING, NOISE REDUCTION, SUPPRESSION, ERROR CORRECTION CODES, INSTRUCTION MANUALS, DELTA MODULATION
Field(s)/Group(s):
Cybernetics, Human Factors Engineering and Man Machine Systems
Keyword(s):
Adaptive predictive coding, CVSD(Continuously Variable Slope Delta Modulation), QMF(Quadrature Mirror Filters)
Report Date:
1980 Sep 30