Method for determining pcm coding law
CA 1297984 C · Owner: Bell Communications Research, Inc. · Inventors: Petruschka, Orni
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus and method for analyzing a bit stream to determine whether the stream is encoded in A-law PCM or µ-law PCM. Bit positions 2, 3, and 4 are examined to determine which of the 8 possible segment codes are present. Segment codes representing low amplitude speech should predominate statistically over segment codes representing high amplitude speech. If the sample cannot be classified by the appearance of low amplitude segments the higher amplitude segments are compared and that coding law is detected as being present which accrues the lower count for such high amplitude segments. .
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.