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The microphone array acoustic source localization is widely used in video conference system and voice robot. The presented localization method adopts the sound source ranging algorithm based on time difference of arrival (TDOA). The key issue of TDOA is the time delay estimation algorithm. In this article, a novel parameter identification based time delay calculating method is proposed. The validity...
For the realistic demand of data security communications, the paper proposes a new algorithm for encryption/decryption based on the theory of artificial immunization. It is a new method based on the negative selection algorithm and extracts the encryption factor from the plaintext. Encryption factor as a key group is expanded by the way of the m-sequence and generates pseudo-random key sequence that...
The mining association rule is an important research field in data mining. The mining association rule usually adopts this model: support, confidence, interestingness. But this model can't measure the correlative degree between the antecedent and the consequent of the rule by ration. So we proposed a new mining model of association rules: support, coincidence, interestingness and analyzed the meaning...
In this paper, we propose a method for aligning networked cameras spatially and temporally. Synchronizing video sequences and recovering spatial information among cameras are crucial steps for applications such as robust tracking and video mosaic. Without prior knowledge of internal and external parameters of cameras, we attempt to automatically estimate their spatial relationship and time offset...
The Markov modulated poisson processes (MMPP) are very powerful in describing general network traffic. The main hindrance to the application of MMPP is the state-space explosion problem, that is, the superposition of two traffic processes, described by MMPP with orders of n1 and n2, respectively, is also an MMPP process with orders of n1 times n2. In this paper, we propose a new method to reduce the...
The difficulty for accurate determination of the angles of arrival (AOA) of signals arises from the optimization of likelihood functions of high dimension. Usually, a gradient-based technique is employed to find the optimum of the function. However, this method requires heavy computational work and the differentiability of the likelihood function. This paper presents two gradient-free methods: One...
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