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;
detecting each of the audio signal frames to determine whether the audio signal frame is a background signal frame;
adding a step value to a background frame counter when a background signal frame is detected;
obtaining a music characterization value of the background signal frame, and adding the music characterization value to an accumulated background music characterization value; and
comparing the accumulated background music characterization value with a threshold when the background frame counter reaches a preset number, and determining that the input audio signal is background music if the accumulated background music characterization value 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 detected to determine whether it is a background frame. The detected background signal is further detected according to a music characterization value and a decision rule. Therefore, background music can be detected, and the classifying performance of the voice/music classifier is improved.
18 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; detecting each of the audio signal frames to determine whether the audio signal frame is a background signal frame; adding a step value to a background frame counter when a background signal frame is detected; obtaining a music characterization value of the background signal frame, and adding the music characterization value to an accumulated background music characterization value; and comparing the accumulated background music characterization value with a threshold when the background frame counter reaches a preset number, and determining that the input audio signal is background music if the accumulated background music characterization value 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 detect each input audio signal frame of a plurality of input audio signal frames and to output a first detection result indicating whether the audio signal frame is a background signal frame; and a background music recognizer configured to detect the background signal frame according to a music characterization value of the background signal frame once the background signal frame is detected and to output a second detection result indicating that background music is detected, wherein the background music recognizer comprises; a background frame counter configured to add a step value to the counter once the background signal frame is detected; a music characterization value obtaining unit configured to obtain the music characterization value of the background signal frame; a music characterization value accumulator configured to accumulate the music characterization value of the background signal frame; and a decider configured to determine that the accumulated music characterization value fulfills a threshold decision rule when the background frame counter reaches a preset number and to output the second detection result indicating that the background music is detected. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification