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Segmenting audio signals into auditory events

A technology for auditory events and audio signals, which is applied in speech analysis, image communication, speech recognition, etc. to achieve high computational efficiency and high computational efficiency.

Inactive Publication Date: 2012-03-21
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 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

Examples

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Embodiment Construction

[0036] 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

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 (5-1), calculating the difference in spectral content between successive time blocks of the audio signal (5-2), 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 (5-3). 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 (5-4). Optionally, the invention may also assign a characteristic to one or more of the auditory events (5-5).

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". [0002] Background technique [0003] 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, Mas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L11/00G06K9/00G10L15/04G10L17/26G10L21/04G10L25/00G10L25/48H03M7/30H04N5/04H04N5/60
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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