piumini Moncler Based on Model Reference Adaptive

Based on Model Reference Adaptive noise processing

3; one. Sampling points vernacular Ma Wei B saliva elimination trench at the boat yard bomb Wei B Michaelis sent cellar with reference to Figure 2 B sub-channel adaptive noise cancellation filter structure of Figure 4 The simulation system in the experiment simulation, we use the average power over Gaussian white noise drown large speech signal, the appropriate adjustments based on the speech signal the variance of Gaussian white noise, scrambled voice signal is basically drowned the noise, the test noise cancellation adaptive filter results. Simulation model shown in Figure 3: Figure 3 Adaptive Noise Cancellation for Speech simulation model 1O April 2003 Noise and Vibration Control Simulation Theory No. 5 shown in Figure 3: From the voice input module input speech signal, the noise input module The Gaussian white noise plus interference, noise filtering module uses the FIR filter [4], the filtered signal waveform from the waveform display module, and output to the audio file. It can be seen, the simulation model is still a gap between the actual situation, such as voice input and noise input is not the actual channel input. However,[link widoczny dla zalogowanych], after low-pass filter the noise signal and noise signal into the adaptive filter relevant, fully meet the noise cancellation adaptive filter to complete the work necessary conditions. Simulation parameters are as follows: voice input: the input from a sound file; Gaussian white noise: mean 0 and variance 10; filter parameters: step length 32 FIR,[link widoczny dla zalogowanych], a step factor of 0.5, the filter initial parameters ( O) = O, leakage coefficient is 1; initial noise: SN2 = a 20dB. The simulation results shown in Figure 4: Dian love o. aS committee what you ■: SS (t): the input speech signal lN (t): Gaussian white noise signal lD (t): Gaussian white noise and speech signal aliasing lE (£): The adaptive filter The output signal after denoising l Figure 4 Speech signal in white Gaussian noise, adaptive filtering context of the results of waveform simulation analysis: The output waveform from the oscilloscope can be seen when adding a strong Gaussian white noise, speech signals have been completely buried, useful information has been completely unrecognizable. After filtering, the speech waveform has been to identify, and can get a more complete and clear information about the original speech signal, the noise has been largely eliminated. Also contains a small part of the internal high-frequency noise,[link widoczny dla zalogowanych], consider using other fixed FIR filter or a further increase in the order of ways to get better results. 6 Conclusion As can be seen from the simulation results, with the reference channel designed to properly set the background noise in the environment pickup device, you can obtain the noise reference input field in order to realize the adaptive filter denoising; through the use of self- adaptive filter,[link widoczny dla zalogowanych], can in no prior knowledge of signal and noise conditions, a clearer signal from the complex to distinguish from background noise. From the simulation results can also be inspiration, choose the right treatment options and use the method of spectrum estimation and blind adaptation filtering method, the adaptive filter can also be non-stationary signal processing,[link widoczny dla zalogowanych], and can not refer to case of the channel from the mixing of signal and noise signal recovery will come, that is, single-channel noise cancellation. References: [13Widrow, B. eta1. AdaptiveNoiseCanceling: Princi-plesandapplications, Proc [C]. IEEE, vo1.63, PP. 1692 ~ 1716,1995. [23SimonHaykin. Adaptive Filter Theory (third edition) [M] N Beijing: Electronic Industry Press, 1998 1O months. [33 Zhang XD N modern signal processing [MIN Beijing: Tsinghua University Press, May 1995. [4] Hu N Canton Book a theory of digital signal processing, algorithms and implementation of [M] N Beijing: Tsinghua dollars, in August 1997. (Continued from page 39) down slowly. Reduce the bearing dynamic load from the point of view, should be the equivalent natural frequency as low as possible, but the equivalent natural frequency the lower the flywheel static deformation of the buffer the greater the spring, the spring stress the greater the negative impact on the life of the larger spring . Screw press with flywheel bearing dynamic load bearing stiffness relationship between the press flywheel buffer spring for the design and provide a basis for selection of bearings. Press this analysis for the design of such a reference. 3 Conclusion References: This article from the clutch screw press against the process of working, derived the movement of moving parts, the establishment of a flywheel vibration differential equations, and cold shock conditions as an example to draw a certain type of clutch [ ,],[Clutch screw press of the vibration and vibration [J]. China Mechanical Engineering, 2001 (9): 990 ~ 993.

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