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The pitch period detection methods for noisy speech signal were analyzed. A pitch detection method for noisy speech signals based on wavelet transform and spacial correlation function was proposed. Pitch period of speech was detected based on the principle of singularity detection of signals with wavelet transform at different scales. And the spacial correlation function of wavelet transform was proposed...
Light use efficiency model is one of the method to retrieval regional scale Gross Prime Productivity (GPP). Absorbed Photosynthetic Active Radiation (APAR) and Light use efficiency are the main parameters of this kind of model. At the same time, light use efficiency is affected by air temperature and precipitation. In this article, one of the Light use efficiency model is used to retrieval daily GPP...
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