Catedra de Fizica. Facultatea de Stiinta si Ingineria ... si...functia initial!. Am arl.tat cl...
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Transcript of Catedra de Fizica. Facultatea de Stiinta si Ingineria ... si...functia initial!. Am arl.tat cl...
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FIZICA PARTEA INTAI
T/2 T
An=~ J sinnc.>tdt- J sinnc.>tdt= T 0 T/2
=
~l
0 pen tru n par
4 pentru n impar .rnt
f(tJ
~f_, -1 t~ r
le T
-1
Fig.6.16.
121
(6.46)
. t ......
Dezvoltarea in serie Fourier a functiei f(t) conduce la urm~toarea expresie:
= -4 sinc.>t+...!..sin3c.>t+...!..sin5(a)t+ ... = n 3n sn
(6.47)
=1, 27 3 sine.> t+O, 424sin3c.> t + o, 255sin5(a) t + ••.
tn Fig.6.17.este prezentatl. unda dreptunghiularl. . f(t), primii trei termeni din dezvoltarea (6.47) ~i
suprapunerea acestor termeni. cu cit se ·,considerl. mai multi termeni cu atlt suprapunerea lor se apropie mai mult de
functia initial!. Am arl.tat cl urechea umanl. distinge sunetele dup~
timbrul lor, adicl dup~ armonicele care insotesc sunetul
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