Hid Led Tester is a simple USB（interrupt mode）device tester package. There are firmware and software in it. Hid Led tester follows USB HID protocol, we don’t need to install driver for the device, and Windows (Win 2000 and later) will install the device automatic.
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
