Enhancement of Multichannel Audio
First Claim
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1. A method for enhancing an audio signal, wherein the audio signal comprises two or more channels of audio content, the method comprising:
- examining a portion of the audio signal to determine whether the portion contains one or more characteristics of speech, and if the portion contains one or more characteristics of speech, classifying the portion as a speech portion, said examining including;
applying a first portion of the audio signal to a speech versus other sound (SVO) detector,applying a second portion of the audio signal to a voice activity detector (VAD), andbiasing a decision by the VAD based on the SVO output;
calculating a gain for the speech portion; and
applying the calculated gain to the audio signal.
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Abstract
The invention relates to audio signal processing. More specifically, the invention relates to enhancing multichannel audio, such as television audio, by applying a gain to the audio that has been smoothed between portions of the audio. The invention relates to methods, apparatus for performing such methods, and to software stored on a computer-readable medium for causing a computer to perform such methods.
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Citations
19 Claims
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1. A method for enhancing an audio signal, wherein the audio signal comprises two or more channels of audio content, the method comprising:
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examining a portion of the audio signal to determine whether the portion contains one or more characteristics of speech, and if the portion contains one or more characteristics of speech, classifying the portion as a speech portion, said examining including; applying a first portion of the audio signal to a speech versus other sound (SVO) detector, applying a second portion of the audio signal to a voice activity detector (VAD), and biasing a decision by the VAD based on the SVO output; calculating a gain for the speech portion; and applying the calculated gain to the audio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for enhancing an audio signal, wherein the audio signal comprises two or more channels of audio content, the system comprising:
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a controller operable to receive a first portion of the audio signal; a detection module operable to determine whether the first portion contains characteristics of speech, and if the first portion is determined to contain characteristics of speech, to identify the first portion as a speech portion, said detection module including a speech-versus-other (SVO) detector applied to a first portion of the audio signal and driving a voice activity detector (VAD) applied to a second portion of the audio signal as a function of an output of the SVO, said driving including biasing a decision by the VAD based on the SVO output; and an enhancement processor operable to calculate a gain for the speech portion and apply the calculated gain to the audio signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for signal processing, comprising:
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receiving an audio signal, wherein the audio signal comprises two or more channels of audio content; analyzing features of the audio signal; classifying a portion of the audio signal as a speech portion if the portion contains one or more features of speech, said classifying including; applying a first portion of the audio signal to a speech versus other sound (SVO) detector, and applying a second portion of the audio signal to a voice activity detector (VAD), and biasing a decision by the VAD based on the SVO output; calculating a gain for the speech portion; and applying the calculated gain to the audio signal.
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Specification