Method and device for analyzing a wave signal and method and apparatus for pitch detection
First Claim
1. A method for analyzing a wave signal, comprising:
- an inputting step of inputting a wave signal representing a sound signal;
an acme detecting step for detecting a set of acmes of a waveform of the wave signal representing the sound signal; and
a trigon extracting step for extracting a set of trigons in accordance with the set of acmes detected by the acme detecting step.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention provides a unique wave-trigon transformation (WTT) method for performing transformation process over a wave signal. The present invention also provides a pitch detecting method and apparatus for detecting pitch based on the WTT process as well as a sentence detecting method and apparatus for detecting a sentence in a sound signal based on the WTT process. The pitch detecting method and apparatus can effectively detect pitch in a sound signal. In the WTT process, an inputted wave signal (such as a sound signal) is transformed into a series of trigons, and an energy-width spectrum is formed using these trigons. For a sound signal containing voice, the distribution of trigons transformed from the sound signal has a certain pattern. By analyzing the pattern, whether a pitch is contained in the sound signal can be determined. In particular, existence of a pitch can be determined by determining and evaluating the periodicity of trigons in a candidate chained peak in the energy-width spectrum.
-
Citations
30 Claims
-
1. A method for analyzing a wave signal, comprising:
-
an inputting step of inputting a wave signal representing a sound signal; an acme detecting step for detecting a set of acmes of a waveform of the wave signal representing the sound signal; and a trigon extracting step for extracting a set of trigons in accordance with the set of acmes detected by the acme detecting step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
-
-
30. A device for analyzing a wave signal, comprising:
-
an input means for inputting a wave signal representing a sound signal; an acme detecting means for detecting a set of acmes of a waveform of the wave signal representing the sound signal; and a trigon extracting means for extracting a set of trigons in accordance with the set of acmes detected by the acme detecting means.
-
Specification