Spatial audio parameter encoding and associated decoding
AssigneeNokia Technologies Oy
InventorsTapani PIHLAJAKUJA, Mikko-Ville LAITINEN
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Abstract
An apparatus comprising means configured to: obtain at least one audio signal; obtain, for the at least one audio signal, spatial audio signal parameter values, the spatial audio signal parameters values distributed within a time-frequency domain; determine a merge metric to control a merging of the spatial audio signal parameter values over the time-frequency domain; and merge, based on the merge metric, the spatial audio signal parameter values to a smaller number of spatial audio signal parameter values over time and/or frequency within the time-frequency domain.
Claims14
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 to:
- obtain, for at least one audio signal, spatial audio signal parameter values, the spatial audio signal parameter values distributed within a time-frequency domain;
- determine an onset metric for detecting a start of a sound event;
- determine a merge metric to control a merging of the spatial audio signal parameter values over the time-frequency domain by the apparatus being caused to determine a spatial audio signal parameter frequency band which best represents spatial audio signal parameter frequency bands within a time period when the onset metric indicates the start of the sound event by the apparatus being caused to determine, for the determined spatial audio signal parameter frequency band, an energy ratio of the determined spatial audio signal parameter frequency band is greater than a weighted mean of an energy ratio of frequency bands within the time period;
- and
- merge, based on the merge metric, the spatial audio signal parameter values to a smaller number of spatial audio signal parameter values over frequency within the time-frequency domain when the energy ratio of the determined spatial audio signal parameter frequency band is greater than the weighted mean of the energy ratio of frequency bands within the time period.
A method comprising:
- obtaining, for at least one audio signal, spatial audio signal parameter values, the spatial audio signal parameter values distributed within a time-frequency domain;
- determining an onset metric for detecting a start of a sound event;
- determining a merge metric to control a merging of the spatial audio signal parameter values over the time-frequency domain by the method comprising determining a spatial audio signal parameter frequency band which best represents spatial audio signal parameter frequency bands within a time period when the onset metric indicates the start of the sound event by determining, for the determined spatial audio signal parameter frequency band, an energy ratio of the determined spatial audio signal parameter frequency band is greater than a weighted mean of an energy ratio of frequency bands within the time period;
- and
- merging, based on the merge metric, the spatial audio signal parameter values to a smaller number of spatial audio signal parameter values over frequency within the time-frequency domain when the energy ratio of the determined spatial audio signal parameter frequency band is greater than the weighted mean of the energy ratio of frequency bands within the time period.
Dependencies are inferred from the claim text.