Method and apparatus for extracting pitch information from audio signal using morphology
First Claim
1. A method of extracting pitch information from an audio signal using morphology, the method comprising the steps of:
- when the audio signal is input, converting it to a frequency domain;
determining an optimum structuring set size (SSS) of a morphological filter performing a morphological closing of a waveform of the converted audio signal;
performing a morphological operation using the determined SSS;
extracting harmonic peaks as the result of the morphological operation; and
extracting pitch information using the extracted harmonic peaks.
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Abstract
A function of improving accuracy of the extraction of pitch information in an audio signal including voice and sound signals is implemented. To do this, a morphological operation is used. In detail, an input audio signal is converted to an audio signal in a frequency domain, an optimum structuring set size (SSS) is determined, and a morphological operation is performed using the determined SSS. Then, by extracting the highest peak from a signal obtained through a predetermined fold and summation process as pitch information, the pitch information can be used in all audio systems in the latter part when voice coding, recognition, synthesis, and/or robustness are performed.
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Citations
13 Claims
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1. A method of extracting pitch information from an audio signal using morphology, the method comprising the steps of:
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when the audio signal is input, converting it to a frequency domain;
determining an optimum structuring set size (SSS) of a morphological filter performing a morphological closing of a waveform of the converted audio signal;
performing a morphological operation using the determined SSS;
extracting harmonic peaks as the result of the morphological operation; and
extracting pitch information using the extracted harmonic peaks. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for extracting pitch information from an audio signal using morphology, the apparatus comprising:
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an audio signal input unit for receiving the audio signal;
a frequency domain converter for converting the input audio signal in a time domain to an audio signal in a frequency domain;
a structuring set size (SSS) determiner for determining an optimum SSS of a waveform of the converted audio signal;
a morphological filter for performing a morphological operation using the determined SSS; and
a harmonic peak extractor for extracting harmonic peaks as the result of the morphological operation and extracting pitch information using the extracted harmonic peaks. - View Dependent Claims (10, 11, 12, 13)
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Specification