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The high-speed precision press is used widely in modern industrial production, particularly in the production of precision parts. The dynamic repeated precision of bottom dead center (BDC) measurement not only affects the quality of stamped parts, but also determines the service life of the pattern. In this paper, the influence of machining error, elastic deformation and joint clearance on the reliable...
A novel speech bandwidth extension method based on audio watermark is presented in this paper. The time-domain and frequency-domain envelope parameters are extracted from the high-frequency components of speech signal, and then these parameters are embedded in the corresponding narrowband speech bit stream by the modified least significant bit watermark method which uses perception property. At the...
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