Audio signal encoder
AssigneeNokia Technologies Oy
InventorsAdriana VASILACHE, Lasse Juhani LAAKSONEN, Anssi Sakari RÄMÖ
Life of this patent
Estimating the term…
Abstract
An apparatus comprising: a channel analyser configured to determine for a first frame of at least one audio signal a set of first frame audio signal multi-channel parameters; a multichannel difference selector configured to select for the first frame groups of elements of the set of first frame audio signal multi-channel parameters based on a value associated with the first frame; and a multichannel parameter encoder configured to generate an encoded first frame audio signal multi-channel parameter based on the selected groups of elements of the set of first frame audio signal multi-channel parameters.
Claims21
1-22. (canceled)
An apparatus comprising at least one processor and at least one memory including computer program code for one or more programs, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
- determine for a first frame of at least one audio signal a set of first frame audio signal multi-channel parameters;
- select for the first frame groups of elements of the set of first frame audio signal multi-channel parameters based on a value associated with the first frame;
- and
- generate an encoded first frame audio signal multi-channel parameter based on the selected groups of elements of first frame audio signal multi-channel parameters.
An apparatus comprising at least one processor and at least one memory including computer program code for one or more programs, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
- receive within a first period a encoded audio signal comprising at least one first frame downmix audio signal and at least one multi-channel audio signal parameter signal comprising groups of elements of a set of first frame audio signal multi-channel parameters;
- recover from the groups of elements of the set of first frame audio signal multi-channel parameters individual elements of the set of audio signal multi-channel parameters;
- and
- generate for the frame at least two channel audio signals from the at least one first frame downmix audio signal and the combination of a sub-set of the set of first frame audio signal multi-channel parameters and recovered individual elements of the set of audio signal multi-channel parameters.
The apparatus as claimed in claimed 35, wherein the set of first frame audio signal multi-channel parameters comprises a set of differences between at least two channels of at least one audio signal, wherein the set of differences comprises two or more difference values, where each difference value is associated with a sub-division of resources defining the first frame.
A method comprising:
- determining for a first frame of at least one audio signal a set of first frame audio signal multi-channel parameters;
- selecting for the first frame groups of elements of the set of first frame audio signal multi-channel parameters based on a value associated with the first frame;
- and
- generating an encoded first frame audio signal multi-channel parameter based on the selected groups of elements of the set of first frame audio signal multi-channel parameters.
A method comprising:
- receiving within a first period a encoded audio signal comprising at least one first frame downmix audio signal and at least one multi-channel audio signal parameter signal comprising groups of elements of a set of first frame audio signal multi-channel parameters;
- recovering from the groups of elements of the set of first frame audio signal multi-channel parameters individual elements of the first frame audio signal multi-channel parameters;
- and
- generating for the frame at least two channel audio signals from the at least one first frame downmix audio signal and the individual elements of the first frame audio signal multi-channel parameters.
The method as claimed in claimed 41, wherein the set of first frame audio signal multi-channel parameters comprises a set of differences between at least two channels of at least one audio signal, wherein the set of differences comprises two or more difference values, where each difference value is associated with a sub-division of resources defining the first frame.
Dependencies are inferred from the claim text.