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A microprogrammed digital vocoder analyzer

Published:01 March 1970Publication History
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Abstract

In order to demonstrate the feasibility of using small, general-purpose, microprogrammed computers for real-time digital signal processing, the application of the LX-1 microprocessor as a digital vocoder was investigated. The advantages of using a microprogrammed processor rather than special-purpose hardware for this application are the lower cost of such a general-purpose computer and the flexibility provided by the ability to change the microprogram.

The paper describes an implementation of the spectrum analyzer portion of the vocoder and its operation on the LX-1 simulator. The results show that real-time operation of the spectrum analyzer on the LX-1 prototype (with 70 nsec cycle time) could be expected with minimal additional hardware: a 200-sample input buffer and a fast multiplier.

Moreover, the proposed LSI version of LX-1 could be operated in half duplex mode for both analysis and synthesis, or to process several input channels.

References

  1. G. D. Hornbuckle, "The LX-1 Microprocessor", this issue.Google ScholarGoogle Scholar
  2. W. M. Anderson, Jr., "Specification of a Digital Vocoder System", Acoustical Society of America, Cleveland, Ohio, November 19--22, 1968.Google ScholarGoogle Scholar
  3. T. Bially, "Structure of a Digital Channel Vocoder", International Conference on Communications, Boulder, Colorado, June 9--11, 1969.Google ScholarGoogle Scholar
  4. W. R. Sutherland, J. W. Forgie, and M. V. Morello, "Graphics in Time-Sharing: A Summary of the TX-2 Experience", 1969 Spring Joint Computer Conference. Google ScholarGoogle ScholarDigital LibraryDigital Library
  5. B. Gold, "Computer Program for Pitch Extraction", Journal of the Acoustical Society of America, Vol 34, No. 7, 916--921, July 1962.Google ScholarGoogle ScholarCross RefCross Ref

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  1. A microprogrammed digital vocoder analyzer

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      • Published in

        cover image ACM SIGMICRO Newsletter
        ACM SIGMICRO Newsletter  Volume 1, Issue 4
        March 1970
        22 pages
        ISSN:1050-916X
        DOI:10.1145/2579809
        Issue’s Table of Contents

        Copyright © 1970 Author

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        Association for Computing Machinery

        New York, NY, United States

        Publication History

        • Published: 1 March 1970

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