Audio signal loudness determination and modification in the frequency domain
AssigneeDolby Laboratories Licensing Corporation
InventorMichael J. Smithers
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Abstract
Methods of, apparatuses for, and computer readable media having instructions thereon that when executed cause carrying out methods of determining and modifying the perceived loudness of a frequency domain audio signal where the frequency resolution, and corresponding temporal coverage of the frequency domain information is not constant. The frequency (and thus temporal) resolution of the perceived loudness processing is maintained constant at the longest block size. One method includes a block combiner and a loudness modification interpolator.
Claims25
A method of perceived loudness processing of audio data comprising frequency domain data determined by a transform at a plurality of block sizes, the method comprising:
- accepting blocks of frequency domain audio data at the plurality of block sizes;
- for the accepted blocks at a particular short block size shorter than a longest block size of the plurality block sizes, combining a plurality of blocks of frequency domain data at the particular short block size to form a block of frequency domain data at the longest block size;
- and
- carrying out the perceived loudness processing of the accepted blocks at the longest block size,
- wherein carrying out the perceived loudness processing includes determining one or more perceived loudness parameters.
A computer-readable storage medium configured with instructions that when executed by at least one processor carry out a method of perceived loudness processing of audio data that includes frequency domain data determined by a lapped transform at a plurality of block sizes, the method comprising:
- accepting blocks of frequency domain audio data at the plurality of block sizes;
- for accepted blocks of data at a particular short block size shorter than a longest block size of the plurality of clock sizes, combining a plurality of blocks of frequency domain data at the particular short block size to form a block of frequency domain data at the longest block size;
- and
- carrying out the perceived loudness processing of the accepted blocks at the longest block size,
- wherein carrying out the perceived loudness processing includes determining one or more perceived loudness parameters.
An apparatus for perceived loudness processing of audio data comprising frequency domain data determined by a transform at a plurality of block sizes, the apparatus comprising:
- a block combiner configured to accept blocks of frequency domain audio data, each block being at one of the plurality of block sizes, including to accept blocks of data that are at a particular short block size shorter than a longest block size of the plurality of clock sizes, and to combine a plurality of the accepted blocks of frequency domain data at the particular short block size to form a block of frequency domain data at the longest block size;
- and
- a frequency-domain signal processor configured to carry out the perceived loudness processing of the accepted blocks at the longest block size,
- wherein carrying out the perceived loudness processing by the frequency-domain signal processor includes determining one or more perceived loudness parameters.
Dependencies are inferred from the claim text.