FULL-DUPLEX DIGITAL VOCODER, PART I.
Abstract
This report presents the results of the design, development, and manufacture of a polymodal, full-duplex, digital vocoder system. This vocoder equipment provides the user with a choice of five primary modes of operation. These five modes consist of three digital transmission rates (1200, 2400, and 9600 bps) and four degrees of speech intelligibility, voice quality, and talker recognition. This equipment was developed for two primary purposes: first, to provide an experimental polymodal vocoder flexible enough to meet a wide variety of requirements, and second, to provide a research tool for studies and evaluation of various innovations in vocoder design. Spectrum-normalizing techniques used in this system provide more effective quantization of spectrum data and allow fewer bits per second in specifying these data. Various optional modes of operation have been incorporated which increase the flexibility of the system. Fully automatic bit and frame synchronization is used. An all-digital technique of pitch pulse code modulation encoding/ decoding has been designed that provides rapid and accurate conversion of the pitch frequency information to digital data. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 10, 1963
- Accession Number
- AD0420870
Entities
People
- Lawrence A. Yaggi Jr.
Organizations
- Texas Instruments