On pitch-synchronous abridgment of the linear prediction residual
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 multiple 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 most complicated MRP approach.
- Publication:
-
Naval Research Lab. Report
- Pub Date:
- March 1982
- Bibcode:
- 1982nrl..reptQR...S
- Keywords:
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- Speech;
- Speech Baseband Compression;
- Voice Communication;
- Acoustics;
- Auditory Perception;
- Frequencies;
- Noise Reduction;
- Communications and Radar