METHOD AND APPARATUS FOR DETECTING AUDIO SIGNALS
First Claim
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1. A method for detecting audio signals, the method comprising:
- dividing an input audio signal into multiple audio signal frames;
inspecting every audio signal frame to check whether it is a foreground signal frame or a background signal frame;
adding a step length value to a background frame counter when a background signal frame is detected;
obtaining a music eigenvalue of the background signal frame, and adding the music eigenvalue to an accumulated background music eigenvalue; and
comparing the accumulated background music eigenvalue with a threshold when the background frame counter reaches a preset number, and determining the signal as background music if the accumulated background music eigenvalue fulfills a threshold decision rule.
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Abstract
A method and an apparatus for detecting audio signals are disclosed. The input audio signal is inspected to check whether it is a foreground frame or a background frame; the detected background signal is further inspected according to the music eigenvalue and the decision rule. Therefore, background music can be detected, and the classifying performance of the voice/music classifier is improved.
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Citations
19 Claims
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1. A method for detecting audio signals, the method comprising:
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dividing an input audio signal into multiple audio signal frames; inspecting every audio signal frame to check whether it is a foreground signal frame or a background signal frame; adding a step length value to a background frame counter when a background signal frame is detected;
obtaining a music eigenvalue of the background signal frame, and adding the music eigenvalue to an accumulated background music eigenvalue; andcomparing the accumulated background music eigenvalue with a threshold when the background frame counter reaches a preset number, and determining the signal as background music if the accumulated background music eigenvalue fulfills a threshold decision rule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A coder, comprising:
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a background frame recognizer, configured to inspect every input audio signal frame, and output a detection result indicating whether the frame is a background signal frame or a foreground signal frame; and a background music recognizer, configured to inspect a background signal frame according to a music eigenvalue of the background signal frame once the background signal frame is detected, and output a detection result indicating that background music is detected, wherein the background music recognizer comprises; a background frame counter, configured to add a step length value to the counter once a background signal frame is detected; a music eigenvalue obtaining unit, configured to obtain the music eigenvalue of the background signal frame; a music eigenvalue accumulator, configured to accumulate the music eigenvalue; and a decider, configured to determine that a accumulated background music eigenvalue fulfills a threshold decision rule when the background frame counter reaches a preset number, and output the detection result indicating that the background music is detected. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification