41. The methods of signal processing include time domain, frequency domain, and complex frequency domain . 42. One can check this easily in the frequency domain , where differentiation becomes multiplication by ?. 43. Time domain methods are preferred to frequency domain methods when short-term recordings are investigated. 44. :The sinc function in the time domain is a windowing function in the frequency domain . 45. Signals are converted from time or space domain to the frequency domain usually through the Fourier transform. 46. The most common purpose for analysis of signals in the frequency domain is analysis of signal properties. 47. A low-pass lifter is similar to a low-pass filter in the frequency domain . 48. In frequency domain , they are displayed as phase shift among the signals received by the sensors. 49. In other words, convolution in the time domain is equivalent to multiplication in the frequency domain . 50. In the frequency domain they may be named kernel, logon, and frame, among others.