Some comparisons of Walsh transformations and Fourier transformations for speech compression
Abstract
It is believed that there will soon be a demand for systems to enable telephone and other voice-grade channels to transmit simultaneously voice communication and one additional service such as facsimile, slow-scan television, or a data channel. The advent of charge coupled devices holds the possibility of reducing the cost of the hardware for providing this channel-sharing to a practical level. A computer model of the speech portion of such a system is discussed. The merits of using the Walsh Transform vs the Fourier Transform as a means of reducing the bandwidth required for the voice component are evaluated along with hardware costs.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- September 1976
- Bibcode:
- 1976STIN...7722319B
- Keywords:
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- Fourier Transformation;
- Voice Communication;
- Walsh Function;
- Channels (Data Transmission);
- Imaging Techniques;
- Multiplexing;
- Telephones;
- Communications and Radar