Integrated PCM level control and conversion using a lookup table

Patent 5243342 Issued on September 7, 1993. Estimated Expiration Date:

July 22, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

Stratacom, Inc.

Application

No. 918931 filed on 07/22/1992

US Classes:

341/106, Coding by table look-up techniques375/253Length coding

Examiners

Primary: Pellinen, A. D.
Assistant: Young, Brian

Attorney, Agent or Firm

Blakely, Sokoloff, Taylor & Zafman

International Class

H03M 007/42

Abstract

A method and apparatus for converting a signal by reading a first signal that is represented in a first format. The first signal is used as an index into a lookup table, the first table containing entries representing signals in a second format modified by a gain. The first table outputs a second signal responsive to the index provided by the first signal, wherein the second signal is represented in a second format.

Other References

Pagnucco & Erskine, "Companding Routines for the TMS2010/TMS2020", Digital Signal Applications With the TMS 320 Family--Theory, Algorithms and Implementations by Texas Instruments, Inc., pp. 169-197 (1986)
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D. Sparrell & M. Sherif, Contribution to Working Parity T1Y1.2 on Specialized Voice and Data Processing, Information on CCITT Work on Packetzed Speech, AT&T, No. T1Y1.2/88-047, pp. 1-83 (Jul. 28, 1988