Methods for audio signal transient detection and decorrelation control

An apparatus, comprising:

• an interface;
• and
• a logic system configured for:
• receiving, from the interface, audio data corresponding to a plurality of audio channels;
• receiving, with the audio data, transient information, wherein the transient information comprises at least one of a transient control value indicating a definite transient event and a transient control value indicating a definite non-transient event;
• determining audio characteristics of the audio data, the audio characteristics comprising additional transient information;
• determining an amount of decorrelation for the audio data based, at least in part, on the audio characteristics;
• and
• processing the audio data according to a determined amount of decorrelation,
• wherein determining additional transient information involves analyzing a portion of the received audio data to detect a soft transient event, wherein the soft transient event corresponds to a non-binary intermediate transient control value indicating neither a definite transient event nor a definite non-transient event,
• wherein processing the audio data involves:
• applying a decorrelation filter to a portion of the audio data, to produce filtered audio data;
• and
• mixing the filtered audio data with a portion of the received audio data according to a mixing ratio,
• wherein determining the amount of decorrelation comprises reducing an amount of decorrelation in response to detecting the soft transient event,
• reducing the amount of decorrelation involves modifying the mixing ratio, and
• modifying the mixing ratio is based, at least in part, on the transient information.