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Comparing audio using characterizations based on auditory events

A technology of auditory events and representation, applied in speech analysis, speech recognition, electrical components, etc., can solve the problems of audio signal analysis and characterization, and achieve the effect of high computational efficiency

Inactive Publication Date: 2005-05-25
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 independently according to human cognition

Method used

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  • Comparing audio using characterizations based on auditory events
  • Comparing audio using characterizations based on auditory events
  • Comparing audio using characterizations based on auditory events

Examples

Experimental program
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Embodiment Construction

[0031] In a practical embodiment of the invention, the audio signal is represented by samples processed in blocks of 512 samples, which corresponds to approximately 11.6 milliseconds of input audio at a sampling frequency of 44.1 kHz. A group length of less than the duration of the shortest perceivable auditory event (approximately 20 milliseconds) is desirable. The aspects of the invention are clearly not limited to such practical embodiments. The principles of the present invention do not require the audio to be arranged into sample groups prior to determining audio events, nor does it require that sample groups of constant length be provided if the audio is arranged into sample groups. However, to minimize complexity, a fixed group length of 512 samples (or some other power of two samples) is beneficial for three main reasons. First, it provides acceptably low enough latency for real-time processing applications. Second, the number of samples is a power of two, which is b...

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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 present invention relates to characterizing audio signals and using characterization to determine whether one audio signal is derived from another audio signal, or whether two audio signals are derived from the same audio signal. Background technique [0002] Dividing sounds into units that are perceived as independent is sometimes referred to as "auditory event analysis" or "auditory scene analysis" ("ASA"). Albert S. Bregman presents an extensive discourse on auditory scene analysis in his book Auditory Scene Analysis - The Perceptual Organization of Sound, Massachusetts Institute of Technology, 1991, Fourth printing 2001, Second MIT Press paperback edition. Additionally, US Patent 6,002,776 (Dec. 14, 1999) to Bhadkamkar et al. cites publications dating back to 1976 as "Prior Work Relating to Sound Separation by Auditory Scene Analysis." However, the Bhadkamkar et al. patent dis...

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
CPCG10L15/04G10L17/26G10L19/018G10L21/04G10L25/48H04N5/04H04N5/60H04N21/233H04N21/8455H04N21/43072G06F2218/12G10L25/00G10L19/02
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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