Peach

Peach helps you create sinc impulse responses and common types of windows. Peach probably is not very useful if you have no idea what a sinc function or an impulse response is and is intended as a help for anyone studying or preparing FIR filters. In Peach , you create sinc impulse responses by starting with a low pass or high pass sinc kernel and then manipulating it in various common ways like spectral inversal , spectral reversal and convolution. Peach can also apply Bartlett, Blackman, Hamming, Hanning, Kaiser, Lanczos, minimum 4-term, Nuttall, Parzen, Truncated Gaussian, and Welch windows and graphs the time domain , step response and magnitude and phase of the impulse response. System requirements: -MacOS 8.5 or later -Any version of QuickTime -8Mb of free RAM