= Speech Codec =

The speech codec is a proprietary unknown AMBE variant from [http://www.dvsinc.com/ DVSI].

The ETSI lists patents relevant to GMR. (See [http://ip5226084r.etsi.org/IPRDetails.aspx?IPRD_ID=151&IPRD_TYPE_ID=2&MODE=2 here]). It is unknown if the list is complete and/or accurate though.

• [http://www.google.com/patents?id=X-EfAAAAEBAJ&zoom=4&pg=PA1#v=onepage&q&f=false US5226084] : Methods for speech quantization and error correction
• [http://www.google.com/patents?id=hv0iAAAAEBAJ&zoom=4&pg=PA1#v=onepage&q&f=false US5715365] : Estimation of excitation parameters
• [http://www.google.com/patents?id=NW8YAAAAEBAJ&zoom=4&pg=PA1#v=onepage&q&f=false US5826222] : Estimation of excitation parameters
• [http://www.google.com/patents?id=eqkjAAAAEBAJ&zoom=4&pg=PA5#v=onepage&q&f=false US5754974] : Spectral magnitude representation for multi-band excitation speech coders
• [http://www.google.com/patents?id=4kMkAAAAEBAJ&zoom=4&pg=PA1#v=onepage&q&f=false US5701390] : Synthesis of MBE-based coded speech using regenerated phase information