Download e-book for kindle: A digital signal processing primer with applications to by Ken Steiglitz

By Ken Steiglitz

ISBN-10: 0805316841

ISBN-13: 9780805316841

This article is directed on the industry of DSP clients caused via the advance of robust and cheap software program instruments to investigate signs. those instruments let refined manipulation of signs yet don't offer an figuring out of the speculation or the root for the innovations. This paintings develops an method of the advance of the maths of DSP and makes use of examples from components of the spectrum wide-spread to rookies, including questions and prompt experiments

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8) into Eq. 1), we obtain pz(t, f ) - ~ , { z ( t - + 2) z*(t - 2)} z(t + ~ ) z * ( t - -~)e-J2'~f'dT. 10) (2O Eq. 10) is given the symbol Wz(t, f), and is called the W i g n e r d i s t r i b u t i o n (WD) in honor of its discoverer, 1 who derived it in 1932 in a quantum-mechanical context [3]. The approximation in Eq. e. if r is constant; it is also exact if r is quadratic [4, p. e. if r is linear. Thus the W D gives an "unbiased" estimate of the IF for a complex linear F M signal. 11) leads to the signal kernel g (t, = + (t = cos2 fc(t + cos2 A(t- _ 12 COS27rfcT + -~ -1 COS2~V2fct.

4 Summary and Discussion Clear rationales are developed for justifying the need to use joint time-frequency representations for non-stationary signals such as FM signals. An understanding of the concept of instantaneous frequency and its dual, time delay, is necessary for the interpretation of TFDs. The use of the analytic associate of a given real signal, rather than the signal itself, is useful for reducing the required sampling rate, and essential for obtaining an unambiguous instantaneous frequency.

38) co where GI(u)-H(2)H*(-2). 39) If el (v)= O for > B/2, then the limits of integration in Eq. 38) may be changed to :I:B/2. u. This Gl(u) is the effective Doppler window corresponding to the sliding frequency window H ( f - fo). 40) in the (u, ~) domain. If we consider time-limiting alone, the resulting TFD is given by Eq. 35) and is called the w i n d o w e d W V D [8-10]. If we consider bandlimiting alone, the resulting TFD is given by Eq. 38). We shall call this the filtered W V D . 5 are verified.

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A digital signal processing primer with applications to digital audio and computer music by Ken Steiglitz


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