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US 2018/0122384 A1Published application
Audio encoding and rendering with discontinuity compensation
AssigneeDolby Laboratories Licensing Corporation
InventorsVinay MELKOTE, David S. MCGRATH
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Abstract
Methods for generating encoded audio programs indicative of N channels of discontinuity-corrected, encoded audio content, including by applying discontinuity correction values to multi-channel audio content, and for rendering such a program (e.g., to generate a discontinuity-corrected M-channel mix of content indicated by the program). Other aspects are systems or devices (e.g., encoders or decoders, or rendering systems) configured to implement any of the methods.
Claims22
A method for generating an encoded audio program, including steps of:
- (a) encoding N audio input signals as N channels of encoded audio content, in accordance with a sequence of rendering matrices specified for rendering audio content of at least some of the N audio input signals, where transitions between matrices of the sequence of rendering matrices occur at update times;
- (b) determining an unscaled correction signal set and correction scaling coefficients for scaling the correction signal set, for correcting a discontinuity in audio rendered from the encoded audio program resulting from an update of the rendering matrices, wherein the unscaled correction signal set comprises at least one of a zeroth order correction signal p0(t) for correcting a zeroth order discontinuity, being a discontinuity in the rendering matrix itself at the time of the update, and a first order correction signal p1(t) for correcting a first order discontinuity, being a discontinuity in the derivative of the rendering matrix at the time of the update;
- and
- (c) generating the encoded audio program to include N channels of discontinuity-corrected, encoded audio content, by adding the correction signal set, scaled by the correction scaling coefficients, to the encoded audio content of at least some of the N channels, wherein step (c) also includes a step of including the correction signal set in the encoded audio program.
1 more element
A decoder, including:
- a memory which stores, in non-transient manner, at least one segment of an encoded audio program which includes N channels of discontinuity-corrected, encoded audio content, and includes data indicative of an output rendering matrix;
- and
- a mix generation subsystem coupled and configured to mix samples of the discontinuity-corrected, encoded audio content, including by applying to the samples said data indicative of the output rendering matrix, to generate an M-channel mix of at least some of the discontinuity-corrected, encoded audio content, where a sequence of rendering matrices has been specified for rendering the M-channel mix, where transitions between matrices of the sequence of rendering matrices occur at update times, where N and M are integers, and wherein the N channels of discontinuity-corrected, encoded audio content have been generated by applying discontinuity correction values to N channels of audio content to implement discontinuity correction at at least one of the update times.
11-21. (canceled)
An audio encoder configured to generate an encoded audio program, said encoder including:
- a first subsystem coupled and configured to encode N audio input signals as N channels of encoded audio content, in accordance with a sequence of rendering matrices specified for rendering audio content of at least some of the N audio input signals, where transitions between matrices of the sequence of rendering matrices occur at update times;
- and
- a second subsystem, coupled to the first subsystem, and configured to determine an unsealed correction signal set and correction scaling coefficients for scaling the correction signal set, for correcting a discontinuity in audio rendered from the encoded audio program resulting from an update of the rendering matrices, wherein the unsealed correction signal set comprises at least one of a zeroth order correction signal p0(t) for correction a zeroth order discontinuity, being a discontinuity in the rendering matrix itself at the time of the update, and a first order correction signal p1(t) for correcting a first order discontinuity, being a discontinuity in the derivative of the rendering matrix at the time of the update,
- wherein the first subsystem is configured to generate the encoded audio program to include N channels of discontinuity-corrected, encoded audio content, by adding the correction signal set, scaled by the correction scaling coefficients to the encoded audio content of at least some of the N channels
- wherein the encoder is further configured to include the correction signal set in the encoded audio program.
2 more elements
24-32. (canceled)
Dependencies are inferred from the claim text.