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Segmenting audio signals into auditory events

A technology of auditory events and audio signals, which is applied in speech analysis, image communication, speech recognition, etc., can solve the problems of audio signal analysis and representation, cognition independent and completely different perception, etc., and achieve high computational efficiency and computational efficiency Effect

Inactive Publication Date: 2004-08-25
DOLBY LAB LICENSING CORP
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  • Description
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  • 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 and distinctly according to human cognition

Method used

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  • Segmenting audio signals into auditory events
  • Segmenting audio signals into auditory events
  • Segmenting audio signals into auditory events

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Embodiment Construction

[0033] According to an embodiment of an aspect of the present invention, the auditory scene analysis consists of such as Figure 5 The three general processing steps shown in part . The first step 5-1 ("Perform Spectral Analysis") takes the time-domain audio signal, divides the time-domain audio signal into groups, and calculates the spectral profile or spectral content of each group. Spectral analysis transforms an audio signal into the short-term frequency domain. This can be done with arbitrary filter banks, based on transforms or multiple banks of bandpass filters, and in linear frequency space or in a warped frequency space (e.g. Bark scale or critical bands closer to the characteristics of the human ear) . For any filter bank, there is a tradeoff between time and frequency. Higher time resolution and thus shorter time intervals result in lower frequency resolution. The higher the frequency resolution, the narrower the sub-bands, resulting in longer time intervals.

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Abstract

Described is a method for time aligning an audio signal and another signal, comprising deriving a reduced-information characterization of the audio signal and embedding said characterization in the other signal when the audio signal and other signal are substantially in synchronism, wherein said characterization is based on auditory scene analysis; recovering the embedded characterization of said audio signal from said other signal and deriving a reduced-information characterization of said audio signal from said audio signal in the same way the embedded characterization of the audio signal was derived based on auditory scene analysis, after said audio signal and said other signal have been subjected to differential time offsets; calculating the time offset of one characterization with respect to the other characterization, and modifying the temporal relationship of the audio signal with respect to the other signal in response to said time offset such that the audio signal and other signal are in synchronism or nearly in synchronism with each other.

Description

technical field [0001] The invention relates to sound quality processing of audio signals. More specifically, the present invention relates to various aspects of dividing or segmenting an audio signal into "auditory events" that are perceived as separate and distinct, and relating to the analysis of audio signals in terms of auditory events, and in terms of audio signals within such audio events. Features or characteristics (optional), aspects of the resulting simplified information presentation of an audio signal. Audio events can be used to define MPGE-7 "Audio Slices" proposed by "ISO / IEC JTC 1 / SC29 / WG 11". Background technique [0002] The division of sound into independently and distinctly perceived units or segments 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, Massachusett...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G10L15/04G10L17/26G10L21/04G10L25/00G10L25/48H03M7/30H04N5/04H04N5/60
CPCG10L25/48G10L17/26H04N5/04G06K9/00536H04N5/60G10L15/04G10L21/04G10L25/00
Inventor 布莱特·G·克罗克特
Owner DOLBY LAB LICENSING CORP
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