These are also simulated on computer and the results show that the LPF method is more suitable for the qu.

Fundamentals of IF(Intermediate Frequency) bandpass signal sampling and quadrature detection are discussed,especially the coherent mixing LPF method and Hilbert transform frequency-shift method.

Design of a programmable low-pass filter based on high reliability and its applications;

Development of Programmable Low-Pass Filter Circuit Based-on SCF;

Due to the large torque ripple of induction motor based on direct torque control at low speed,in this paper,on the basis of conventional direct torque control,the fuzzy controller is used for choosing the switching state of the inverter,and using low-pass filter compensates the value of the flux.

In thesis each kind of low-pass filtering algorithm is studied and the wavelet filtering algorithm is proposed.

At present,there are a number of approaches of forming digital I/Q components,such as low-pass filtering approach and Hilbert transform approach and so on.

Firstly,the algorithm for accomplishing spatial domain low-pass filtering in the compressed domain is formulated based on the properties of the DCT.

The spectrum of UV image is analyzed,noises mainly distribute in the high part of the spectrum,then low pass filter can be used for UV image noise reduction.

Second, using low pass filters to pick up the high frequency component for estimating the upper limit can get a more general limit and avoid the diffi.

Signal reliability is improved by using a low pass filter to silence background noise.

In this paper,the physical process of time domain convolution operation and frequency domain product operation were analyzed by taking the digital low pass filtering as the examples,using the calculating and mapping function of MATLAB and considering the characteristics of the digital signal processing.

The low pass filtering PID algorithm based on the digital filtering technology is designed.

This paper discusses how to implement the direct sampling of radar IF signal with high speed A/D converter and how to resolve one channel of digital signal into two orthogonal digital signals by Bessel interpolation or low pass filtering to realize a digital coherent detection,presents the implementation program based on high speed AD6640 and complex programmable logic device.

Based on the general channel model of aviation mobile communications, the ICI mechanism is analyzed, and the lowpass filtering in frequency domain is adopted to restrain the influence from ICI and channel noise to affect the least square (L.

Some measures for improving the method are presented as follows:(1) Using double lowpass filter to smooth code pseudoranges;(2) Using least square estimator to locate and fix cycle slips according to characteristics in highly order differential time series;(3) Finding integer number of cycle slips from real-valued cycle slips using the.

This algorithm makes use of lowpass filter and coring circuit to suppress small noise; utilizes adaptive clamping to eliminate ringing effect and “wrong colours”.