Accession Number : ADA111862

Title :   On Pitch-Synchronous Abridgment of the Linear Prediction Residual.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Smith,N D

PDF Url : ADA111862

Report Date : 12 Mar 1982

Pagination or Media Count : 24

Abstract : We developed an approach to abridging the short-term LPC residual and used the abridged information to generate speech at 9.6 to 16 kilobits per second (kb/s). This is an alternative to the baseband residual-excited coder now being used in NRL's Multirate Processor (MRP). The abridgment logic requires less than one multiply per input sample, is independent of voiced/unvoiced decisions, restricts the influence of errors to a single frame, strongly resists brief input anomalies, and provides anchor periods of excellent speech reproduction once per frame. This approach appears promising for practical application in real-time systems where simplicity, stability, and quality are important. It scores somewhat lower overall on the Diagnostic Rhyme Test than the more complicated MRP approach. (Author)

Descriptors :   *Speech compression, *Sound reproduction systems, *Speech transmission, Voice communications, Noise reduction, Real time, Logic, Excitation, Quantization, Audio frequency, Pitch discrimination, Synchronism, Noise analyzers, Noise(Sound), Acoustic filters, Residuals, Predictions, Auditory perception

Subject Categories : Cybernetics
      Human Factors Engineering & Man Machine System
      Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE