CAT

12 3 4

s(t)x(t)Ts1/Ts=fs

1 FT Tx(t),t=0x(n)

2

3

1X(f)1/Ts

2fs

2

fc

A/DA/Db,D

1A/DA/D2

sincx(t)

1 FT

2()

ff=fs/N=1/TDFT()

T2/T-13dB,20% 20dB/10)

T/24/T

T/24/T2.4% -32dB60dB/10