Automatic system and method for analysing content of audio signals

A technology of audio and audio signals, which is applied in the general search field and can solve problems such as not considering audio event indexing

Inactive Publication Date: 2006-12-13
HULU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

What works for their efforts is that these past efforts did not consider an index based on audio events in the stream, and thus access to the audio, to support subsequent searches of computer-saved audio streams for gist , and an overview

Method used

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  • Automatic system and method for analysing content of audio signals
  • Automatic system and method for analysing content of audio signals
  • Automatic system and method for analysing content of audio signals

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Experimental program
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Embodiment approach

[0104] Proceeding to block 162, the dominant frequency for each sample is determined. During the determination of the dominant frequency, the preferred embodiment of the invention considers the following 8 frequency bands:

[0105] R1-100 Hz to 3,000 Hz R2-3,000 Hz to 4,000 Hz

[0106] R3-4,000 Hz to 5,000 Hz R4-5,000 Hz to 6,000 Hz

[0107] R5-6,000 Hz to 6,500 Hz R6-6,500 Hz to 7,000 Hz

[0108] R7 - 7,000 Hz to 7,500 Hz R8 - 7,500 Hz to 8,000 Hz

[0109] For each sample, the dominant frequency is calculated as follows:

[0110] R n Freq = number of frequencies in the nth band, n = 1 to 8, divided by the total number of samples, where the main frequency range is defined as R n The largest value among the Freq values ​​(8).

[0111] Moving to block 164, a histogram is used to normalize the dominant frequencies. Having determined and normalized the dominant frequency of the audio stream samples, the process moves to block 166 to identify samples whose dominant frequency...

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Abstract

A system and method for indexing an audio stream for subsequent information retrieval and for skimming, gisting, and summarizing the audio stream includes using special audio prefiltering such that only relevant speech segments that are generated by a speech recognition engine are indexed. Specific indexing features are disclosed that improve the precision and recall of an information retrieval system used after indexing for word spotting. The invention includes rendering the audio stream into intervals, with each interval including one or more segments. For each segment of an interval it is determined whether the segment exhibits one or more predetermined audio features.

Description

technical field [0001] The present invention relates generally to audio streams including audio streams extracted from video, and more particularly to methods for classifying and indexing audio streams to support subsequent retrieval, gist, summarization, and browsing of audio streams , and systems and methods for searching in general. Background technique [0002] With the rapid growth of computer applications in general, and multimedia computer applications in particular, large volumes of audio continue to be produced from, for example, audio-video applications, and then stored in electronic form. As the present invention recognizes, as the number of audio files increases, it becomes more difficult to quickly use saved audio streams and efficiently use only existing audio file directories or other existing access means. For example, accessing an audio stream obtained from a video is ideal for retrieving information based on a user's query, or providing an overview of an a...

Claims

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Application Information

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IPC IPC(8): G06F17/30G06F3/16G10L15/00G10L15/04G10L15/08G10L15/10G10L15/18G10L15/26G10L17/26G10L25/00
CPCG06F17/30775G10L15/265G10L15/26G06F17/30746G10L2015/088G10H2210/046G10H2210/061G06F16/64G06F16/685G10L25/48
Inventor德拉古丁·皮特科维奇杜尔斯·比特里斯·庞塞龙萨维萨·斯里尼瓦桑
OwnerHULU