Patent ID: 9230551
Filing Date: 2016-01-05
CPC Classification: G10L

Claim Text:
1. A method comprising: filtering, by executing on a processor, an audio signal into a lower frequency region and a higher frequency region; encoding, by executing on a processor, the lower frequency region with a first encoder for generating a first encoded audio signal; encoding, by executing on a processor, the higher frequency region with a second encoder configured to generate a second encoded audio signal by: determining, by executing on a processor, a higher frequency region reference comprising a range of frequencies of the higher frequency region; processing, by executing on a processor, the lower frequency region and the higher frequency region reference section to determine an index for a sub section of frequencies of the lower frequency region which best matches the higher frequency region reference; processing, by executing on a processor, at least one further range of frequencies of the higher frequency region to determine at least one further index of a further sub section of frequencies of the lower frequency region by searching further ranges of frequencies of the lower frequency region, wherein the searching is based on the index for the sub section of frequencies; and determining, by executing on a processor, a first group of indices from the index and the at least one further index such that the first encoded audio signal and second encoded audio signal is within a defined encoding efficiency parameter.