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Recently, the general Volterra filter (VF) has been adopted for the modeling of parametric loudspeakers. However, the computation complexity of the VF is too high for real-time implementation. In this paper, a one-dimension Volterra filter (ODVF) with much lower complexity is introduced to model and compensate for the nonlinearity of parametric loudspeakers. A theoretical framework for ODVF model...
Due to the nonlinear interaction between the ultrasonic waves emitted by the parametric loudspeaker, a directional sound beam is generated along with harmonic distortion. It is known that the single sideband amplitude modulation (SSB-AM) technique is one of the most effective ways of reducing the harmonics. A 3rd-order inverse Volterra filter (VF) is designed on the basis of the SSB-AM in this paper...
Forest biomass is an important indicator in carbon sequestration capacity and forest carbon budget evaluation, but there is less focus on shrub biomass. Multi-angle images provide the volume scattering information which could improve inversion accuracy. HJ-1 satellites are the sun synchronous recurrent frozen orbit small satellite constellation for environment and disaster monitoring and forecasting...
The Elaeagnus mollis Diels fruits is a specific plant product of south Shanxi province and HuXian of Shaanxi province. Regression equation between the diameter and length of nut, as well as relationship between the weight of kernel and nut was got by analyzing its shape and physical characteristics. Respectively by analyzing load direction and water content of effecting Elaeagnus mollis Diels fruits...
In the robot vision system of the apple harvesting robot, the key is to recognize and locate the apple. To solve recognition questions such as high error rate, too much calculation and time consuming, a new recognizing method, support vector machine (SVM) is applied to improve recognition accuracy and efficiency. At first, vector median filter is used to remove the color images noise of apple fruit...
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