System for perceived enhancement and restoration of compressed audio signals
US-2015379999-A1 · Dec 31, 2015 · US
Low complexity auditory event boundary detection
US8938313B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8938313-B2 |
| Application number | US-201013265683-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 12, 2010 |
| Priority date | Apr 30, 2009 |
| Publication date | Jan 20, 2015 |
| Grant date | Jan 20, 2015 |
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Abstract
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An auditory event boundary detector employs down-sampling of the input digital audio signal without an anti-aliasing filter, resulting in a narrower bandwidth intermediate signal with aliasing. Spectral changes of that intermediate signal, indicating event boundaries, may be detected using an adaptive filter to track a linear predictive model of the samples of the intermediate signal. Changes in the magnitude or power of the filter error correspond to changes in the spectrum of the input audio signal. The adaptive filter converges at a rate consistent with the duration of auditory events, so filter error magnitude or power changes indicate event boundaries. The detector is much less complex than methods employing time-to-frequency transforms for the full bandwidth of the audio signal.
First claim
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The invention claimed is: 1. A method for processing a digital audio signal, comprising: deriving a subsampled digital audio signal by subsampling the digital audio signal so that its subsampled Nyquist frequency is within the bandwidth of the digital audio signal, causing signal components in the digital audio signal above the subsampled Nyquist frequency to appear below the subsampled Nyquist frequency in the subsampled digital audio signal, detecting changes over time in the…
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- G10L19/025Primary
Physics · mapped topic
Physics · mapped topic
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- What does patent US8938313B2 cover?
- An auditory event boundary detector employs down-sampling of the input digital audio signal without an anti-aliasing filter, resulting in a narrower bandwidth intermediate signal with aliasing. Spectral changes of that intermediate signal, indicating event boundaries, may be detected using an adaptive filter to track a linear predictive model of the samples of the intermediate signal. Changes i…
- Who is the assignee on this patent?
- Dickins Glenn N, Dolby Lab Licensing Corp
- What technology area does this patent fall under?
- Primary CPC classification G10L19/025. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jan 20 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).