By Arkadii Kh. Gelig, Alexander N. Churilov

There are major fields of software of pulse-modulated sys tems, communications and regulate. communique isn't a subject matter of our crisis during this ebook. Controlling by means of a pulse-modulated feed attracted our efforts. The peculiarity of this ebook is that every one again the sampled-data structures are thought of in non-stop time, so no discrete time schemes are offered. and at last, we pay a bit at tention to pulse-amplitude modulation which was once handled in an unlimited variety of courses. the first fields of our curiosity are pulse width, pulse-frequency, and pulse-phase modulated keep watch over structures. The examine of such platforms meets with great problems. An engineer, who embarks on theoretical investigations of a pulse-mo dulated keep watch over, is frequently embarrassed through the delicate mathe matical instruments he must recognize. whilst a mathematician, who seems for functional functions of his mathematical equipment, meets with those platforms, he faces loads of of complex technical schemes and phrases. most likely because of this why courses on pulse modu lation are seldom in medical journals. As for books in this topic (save on amplitude modulation), the numerous a part of them is in Russian and infrequently on hand for a non-Russian reader.

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**Example text**

16) where the sequence >'n is bounded and tn+! - tn ~ T for some constant T > O. Let us follow [HW68] to show this. 21) needs some refinements. ) d>.. ) d>' + 1jJ(t). * for any n. )]. Since t - tn ~ 0, t - tn-l ~ T, t - t n-2 ~ 2T, '" , we find the estimate n n k=O k=O Lexp(-c;(t-tk)):S Lexp(-c;kT):S 1 1 - exp ()' -C;T The boundedness of a(t) is proved. 6. We get ! 25) 22 1. 22). 25) will be called neutral. Let us derive another form for the equation of a neutral linear part. \. \) dT >. -0 11 1 t t->.

This definition is readily consistent with the definition of stability given in the previous section for lumped parameter systems (for lumped parameter systems both definitions are equivalent). 21) a(t) is also bounded. 16) where the sequence >'n is bounded and tn+! - tn ~ T for some constant T > O. Let us follow [HW68] to show this. 21) needs some refinements. ) d>.. ) d>' + 1jJ(t). * for any n. )]. Since t - tn ~ 0, t - tn-l ~ T, t - t n-2 ~ 2T, '" , we find the estimate n n k=O k=O Lexp(-c;(t-tk)):S Lexp(-c;kT):S 1 1 - exp ()' -C;T The boundedness of a(t) is proved.

However it is straightforward to show that a stationary T-periodic mode xO(t) of the system at hand is unstable for any T as small as desired, provided 0'* is sufficiently small. To verify this write the equation for sufficiently small deviations z = x-xO(t), ( = O'-O'°(t). 0 =/= O. 0. 0 sgn( Tn - TO).