Audio encoder or decoder apparatus

摘要

An apparatus comprising at least one processor and at least one memory including computer program code the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform: determining from an audio signal at least a first part and a second part; encoding the first part of the audio signal with a first encoder for generating a first encoded audio signal; encoding the second part of the audio signal with a second encoder configured to generate a second encoded audio signal comprising for a first section of the second part an indicator to at least part of the first part of the audio signal; and determining the first section of the second part of the audio signal such that the first encoded audio signal and second encoded audio signal is within a defined encoding efficiency parameter.

主权项

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.