The Window Design Method
The basic idea behind the design of linear-phase FIR filters using the window
method is to choose a proper ideal frequency-selective filter [which always has
a noncausal, infinite duration impulse response] and then truncate its impulse
response hd[n] to obtain a linear-phase and causal FIR filter h[n]. To truncate the
impulse response of the ideal filter a time window w[n] is used. Available windows
in Matlab are rectangular [or boxcar in Matlab], bartlett, hamming, hanning
We obtained the energy transport velocity distribution for a three dimensional ideal cloak
explicitly. Near the operation frequency, the energy transport velocity has rather peculiar
distribution. The velocity along a line joining the origin of the cloak is a constant, while
the velocity approaches zero at the inner boundary of the cloak. A ray pointing right into
the origin of the cloak will experience abrupt changes of velocities when it impinges on the
inner surface of the cloak. This peculiar distribution causes long time delays for beams
passing through the ideal cloak within a geometric optics description.
The double-density DWT is an improvement upon the critically sampled DWT with important additional properties: (1) It employs one scaling function and two distinct wavelets, which are designed to be offset from one another by one half, (2) The double-density DWT is overcomplete by a factor of two, and (3) It is nearly shift-invariant. In two dimensions, this transform outperforms the standard DWT in terms of denoising however, there is room for improvement because not all of the wavelets are directional. That is, although the double-density DWT utilizes more wavelets, some lack a dominant spatial orientation, which prevents them from being able to isolate those directions.
SPWM technique for Three Phase Inverter. Analysis fundamental improvement with respect to modulation index variation is done in simulation. Analysis can be done also for switching frequency variation for shifting the dominant harmonics
Servomotors are available as AC or DC motors. Early servomotors were generally DC motors because the only type of control for large currents was through SCRs for many years. As transistors became capable of controlling larger currents and switching the large currents at higher frequencies, the AC servomotor became used more often. Early servomotors were specifically designed for servo amplifiers. Today a class of motors is designed for applica-tions that may use a servo amplifier or a variable-frequency controller, which means that a motor may be used in a servo system in one application, and used in a variable-frequency drive in another application. Some companies also call any closed-loop system that does not use a stepper motor a servo system, so it is possible for a simple AC induction motor that is connected to a velocity controller to be called a servomotor.
This file is distributed in the hope that it will be useful, but WITHOUT
* WARRANTY OF ANY KIND.
*
* Author(s): Ole Saether
*
* DESCRIPTION:
*
* Hello World program. Please note that this program runs the internal 8051
* on the default power up frequency of 4MHz. See ex3c.c for an example on how
* to switch to 16MHz.
*
* The functionality is the same as in ex1a.asm.
*
* COMPILER:
*
* This program has been tested with Keil V7.07a.
*
* $Revision: 3 $
*
This file is distributed in the hope that it will be useful, but WITHOUT
WARRANTY OF ANY KIND.
Author(s): Ole Saether
DESCRIPTION:
nRF9E5 Hello World program. Please note that this program runs the internal
8051 on the default power up frequency of 4MHz. See ex3a.asm for an example
on how to switch to 16MHz.
The functionality is the same as in ex1c.c.
ASSEMBLER:
You need as31.exe to assemble this program. It can be downloaded from this
web page: http://www.pjrc.com/tech/8051/
$Revision: 4 $
Huffman codes
1.In telecommunication, how do we represent a set of messages, each with an access frequency, by a sequence of 0 s and 1 s?
2.To minimize the transmission and decoding costs, we may use short strings to represent more frequently used messages.
3.This problem can be solved by using an extended binary tree which is used in the 2-way merging problem.
the sourse code is
to encode and decode the Huffman.
This experiment uses the Blackfi n BF533/BF537 EZ-KIT to run a simple FIR fi lter on stereo
channels at a sampling frequency of 48 kHz. The
CYCLE register is embedded in the main
program (
process_data.c) to benchmark the time needed to process two FIR fi lters. A
background telemetry channel (BTC) is set up to display the cycle count.
This is IR (Infra-Red) learn module for home automation system. It can learn IR codes from different IR remotes, and then execute any assigned actions controlled by learned IR remote.
This project was developed using Keil 8051 compiler.
Processor - Atmel AT89C51
Frequency - 22.1184 Mhz (described as OSC_FREQ in "timer.h")
Timer 0 - system timer (used for timeouts and delays)
Also, look in folder /doc for additional information about IR codes formats and codes from different manufacturers.
