Audio Signal Encoder, Audio Signal Decoder, Method for Encoding and Method for Decoding
AssigneeNokia Technologies Oy
InventorsAdriana VASILACHE, Lasse Juhani LAAKSONEN, Anssi Sakari RAMO, Antti HURMALAINEN
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Abstract
A method including determining a plurality of band energy scale values for a pair of audio signals; transforming the band energy scale values using a discrete cosine transform to generate a plurality of coefficient values; and selecting a sub-set of the plurality of coefficient values to generate a representation of a level difference between the pair of audio signals.
Claims22
1-26. (canceled)
An apparatus comprising at least one processor and at least one memory including computer code for one or more programs, the at least one memory and the computer code configured to with the at least one processor cause the apparatus to at least:
- determine a plurality of band energy scale values for a pair of audio signals;
- transform the plurality of band energy scale values using a discrete cosine transform to generate a plurality of coefficient values;
- and
- select a sub-set of the plurality of coefficient values to generate a representation of a level difference between the pair of audio signals.
An apparatus comprising at least one processor and at least one memory including computer code for one or more programs, the at least one memory and the computer code configured to with the at least one processor cause the apparatus to at least:
- determine from an encoded audio signal:
- a plurality of coefficient values representing discrete cosine transformed band energy scale values;
- and a downmixed audio signal;
- inverse cosine transform the plurality of coefficient values to generate a plurality of band energy scale values;
- and
- generate a pair of audio signals by applying the plurality of band energy scale values to the downmixed audio signal.
A method comprising:
- determining a plurality of band energy scale values for a pair of audio signals;
- transforming the plurality of band energy scale values using a discrete cosine transform to generate a plurality of coefficient values;
- selecting a sub-set of the plurality of coefficient values to generate a representation of a level difference between the pair of audio signals.
A method comprising:
- determining from an encoded audio signal:
- a plurality of coefficient values representing discrete cosine transformed band energy scale values;
- and a downmixed audio signal;
- inverse cosine transforming the plurality of coefficient values to generate a plurality of band energy scale values;
- and
- generating a pair of audio signals by applying the plurality of band energy scale values to the downmixed audio signal.
Dependencies are inferred from the claim text.