Coding signals
AssigneeKoninklijke Philips Electronics N.V.
InventorsRenat Vafin, Richard Heusdens, Steven Leonardus Josephus Dimphina Elisabeth Van De Par, Willem Bastiaan Kleijn
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Abstract
An improved representation of transients in audio signals comprises modifying transient locations in such a way that a transient can occur only at a beginning of a sinusoidal segment. The modification procedure comprises the steps: detecting a beginning and an end of a transient using an energy-based approach with two sliding rectangular windows; moving samples between the beginning and the end of the transient to the locations specified by the segmentation used; and time-warping the signal parts in between the transients in order to fill the intervals between the modified transients.
Claims26
A method of coding an input signal, the method comprising:
- estimating a location of at least one transient in a time segment of the input signal;
- the method being characterized by
- modifying the location of the transient so that the transient occurs at a specified location on a predetermined time scale to obtain a modified signal;
- and
- modeling the modified signal.
A method of decoding comprising receiving a modeled modified signal in which a location of transients in at least two channels has been modified, the modeled modified signal further comprising side information describing an original time difference between corresponding transients, the method comprising:
- synthesizing a synthesized signal for the at least two channels, and
- unwarping the synthesized signal according to the original time difference.
Modeled modified signal in which a location of transients in at least two channels has been modified, the signal further comprising side information describing an original time difference between corresponding transients in the at least two channels.
Decoder comprising:
- means for receiving a modeled modified signal in which a location of transients in at least two channels has been modified, the signal further comprising side information describing an original time difference between corresponding transients in the at least two channels, and
- means for synthesizing a synthesized signal for the at least two channels, and unwarping the synthesizing signal according to the original time difference.
Apparatus (10) for coding signals comprises an electronic processor operable to:
- estimate the location of one or more transients in a time segment of an audio or video signal;
- characterized by the processor being operable to modify the location of the or each transient so that the or each transient occurs at a specified location on a predetermined time scale, and
- the processor is operable to model the modified input signal.
Dependencies are inferred from the claim text.