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Method for comparing audio signal by characterisation based on auditory events

An audio signal and time alignment technology, applied in image communication, speech analysis, speech recognition, etc., can solve the problem of not being able to analyze audio signals

Inactive Publication Date: 2004-07-07
DOLBY LAB LICENSING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These parameters, while providing useful information, do not analyze and characterize the audio signal into elements that are perceived solely on the basis of human cognition

Method used

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  • Method for comparing audio signal by characterisation based on auditory events
  • Method for comparing audio signal by characterisation based on auditory events
  • Method for comparing audio signal by characterisation based on auditory events

Examples

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Embodiment Construction

[0032] In a particular embodiment of the invention, the audio signal is represented by samples processed in blocks of 512 samples, which corresponds to approximately 11.6 msec of input audio at a sampling rate of 44.1 kHz. What is desired is a block length with a time below the duration of the shortest perceivable auditory event (about 20 msec). It is to be understood that aspects of the invention are not limited to this particular example. The principles of the present invention do not require the audio to be arranged into blocks of samples before auditory events are determined, nor do they need to provide blocks of constant length if they are. However, to minimize complexity, 512 fixed-length samples (or some other power of 2 number of samples) are useful for three main reasons. First, it provides low enough latency that is acceptable for real-time processing applications. Second, it is the number of samples to the power of 2, which is useful for fast Fourier transform (FF...

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PUM

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Abstract

In one aspect, the invention divides an audio signal into auditory events, each of which tends to be perceived as separate and distinct, by calculating the spectral content of successive time blocks of the audio signal, calculating the difference in spectral content between successive time blocks of the audio signal, and identifying an auditory event boundary as the boundary between successive time blocks when the difference in the spectral content between such successive time blocks exceeds a threshold. In another aspect, the invention generates a reduced-information representation of an audio signal by dividing an audio signal into auditory events, each of which tends to be perceived as separate and distinct, and formatting and storing information relating to the auditory events. Optionally, the invention may also assign a characteristic to one or more of the auditory events. Auditory events may be determined according to the first aspect of the invention or by another method.

Description

technical field [0001] The present invention relates to audio signals. More specifically, the invention relates to characterizing audio signals and using the characterization to time align or synchronize audio signals where one signal has been derived from the other, or where both have been derived from the same other signal. This synchronization is useful, for example, in restoring television audio or video synchronization (sound matching) and in detecting watermarks embedded in audio signals (comparing the watermarked signal with an unwatermarked version of the signal). The invention may be implemented as a low processing power process to bring two such audio signals into substantial time alignment. Background technique [0002] The division of sounds into perceptually individual units is sometimes referred to as "auditory event analysis" or "auditory scene analysis" ("ASA"). A detailed discussion of auditory scene analysis is presented by Albert S. Bregman in his book A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L25/00G06K9/00G10L15/04G10L17/26G10L19/018G10L19/02G10L21/04G10L25/48H03M7/30H04N5/04H04N5/60
CPCG10L17/26G06K9/00536G10L15/04G10L25/48G10L19/018H04N21/4305G10L21/04H04N5/60H04N5/04H04N21/233H04N21/8455H04N21/43072G06F2218/12G10L25/00G10L19/02
Inventor 布莱特·G·克罗克特迈克尔·J·史密斯尔斯
Owner DOLBY LAB LICENSING CORP
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