Fixed quality source coder
CA 2186748 C · Owner: Israelsen, Paul D. · Inventors: Huang, Chien-Min; Israelsen, Paul D.; Harris, Richard W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fixed quality source coder (20) receives and performs VQ on an input signal ID. The fixed quality source coder (20) includes an encoder (28) and may also include a decoder (34). The encoder may include a lossy codec (52) that receives and encodes the signal ID to provide encoded information (38) to a multiplexer (30) regarding the signal ID. The lossy codec (52) also decodes the encoded signal to produce a decoded signal IVQ-I (62). A summer (66) receives ID and IVQ-I and determines an error signal ER (70) where ER equals ID - IVQ-I. A threshold circuit (74) receives the signal ER and passes a truncated error signal ET'. The threshold level T may be set to ensure that the maximum error …
Read the whole patent
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
- Filed March 27, 1995 and granted June 27, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2017.
- 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.