AUDIO VISUAL SIGNATURE, METHOD OF DERIVING A SIGNATURE, AND METHOD OF COMPARING AUDIO-VISUAL DATA BACKGROUND

摘要

The invention relates to the analysis of characteristics of audio and/or video signals for the generation of audio-visual content signatures. To determine an audio signature a region of interest for example of high entropy—is identified in audio signature data. This region of interest is then provided as an audio signature with offset information. A video signature is also provided.

主权项

1. A method of deriving a signature characteristic of a plurality of audio samples comprising steps of:
determining audio signature data representative of the audio samples; determining a section of the audio signature data forming a region of interest; and providing the audio signature data section forming a region of interest as an audio signature; wherein the step of determining audio signature data representative of the audio samples comprises the steps of:
isolating a frequency domain range of interest from the audio samples by passing the audio samples through a low-pass filter and sub-sampling the filtered audio samples; anddetermining audio signature data based on a time-domain variation of the magnitude of the isolated frequency domain range of interest by comparison of each audio sample or filtered audio sample with the preceding respective audio sample or filtered audio sample to derive audio signature data in the form of a characteristic binary signal; and where the step of determining a section of the audio signature data forming a region of interest includes the step of determining a section of the audio signature data with the greatest entropy as the region of interest.