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Test N1
1. Filtering is (a) joining up all together (b) separating one from another (c) computer game (d) Venus crater 2. The convolution theorem says (a) F (b)


dk f dtk

= (i )k (F f )( )

1 f (t)g (t)dt = 2
- -

^ ^ f ( )g ( )d

(c) F {f h} = F {f } · F {h} (d) 2в2=4 3. Fourier transform becomes a Fourier series when (a) the function is not zero at the interval (b) the function is periodic (c) the function is sampled (d) the spectrum support is discrete 4. The frequency and time resolution connected by the (a) Kotelnikov-Shannon theorem (b) Heisenberg uncertainty principle (c) probability density (d) Euler equation 5. The window (Gabor) transform differs from wavelet-transform because (a) the first one doesn't allow to detect the changes of spectrum in time (b) the first one doesn't allow to reconstruct the function from it's decomposition (c) wavelet-transform is continuous


(d) the resolution of wavelet-transform is adapted to the frequency 6. Linear time-invariant operator in general form is given by (a)


e-
-

it

f (t)dt

(b)


w(t)f (t)e-
-

i t

dt

(c)


f (t)g (t)dt
-

(d)


f ( )h(t - )d
-

7. Low-pass filter (a) transmits low frequencies and attenuates high frequencies (b) attenuates low frequencies and transmits high frequencies (c) is useful for brewing (d) helps from the sea-sick Student's name

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