Research on narrowband communications
Abstract
We report on research toward a very-low-rate vocoder. This quarter we continued investigation in two areas: the phonetic vocoder and an unsupervised method for vocoding. We introduced phoneme pair probabilities to improve the accuracy of phonetic recognition. We investigated the use of the phonetic vocoder as a tool for semi-automatic labeling of speech. We also experimented with several variations of the phonetic vocoder to improve the intelligibility of the vocoded speech with a moderate increase of the bit rate. Our work in the second area concentrated on developing a novel method of spectral quantization: We quantize a sequence of spectra simultaneously. We are also evaluating a new distance metric that does not require the dynamic programming time warping.
- Publication:
-
Quarterly Progress Report
- Pub Date:
- August 1981
- Bibcode:
- 1981bbn..reptR....M
- Keywords:
-
- Bandwidth;
- Speech Baseband Compression;
- Vocoders;
- Voice Communication;
- Data Bases;
- Dynamic Programming;
- Frequency Ranges;
- Radio Communication;
- Signal Reception;
- Communications and Radar