Digital Signal Processing Reference
In-Depth Information
0,5
Blocklength = 64
Sample frequency 64 Hz
Duration of signal: 1s
Signal frequency 2 Hz
Time domain
0,4
0,3
0,2
0,1
0,0
-0,1
-0,2
-0,3
-0,4
-0,5
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
850
900
950
ms
0,40
Frequency domain
..... from 0 to 32 Hz
0,30
0,20
0,10
0,00
2,5
5,0
7,5
10,0
12,5
15,0
17,5
20,0
22,5
25,0
27,5
30,0
Hz
Illustration 193:
Time and frequency domain of sawtooth of 2Hz sampled for exactly 1s
As in Illustration 192 the spectrum in this Illustration comprises 32 frequencies at n = 64. On account of
the sawtooth frequency of 2 Hz the spectrum only contains the integer multiples of 2, i.e. 2,4,6,8, ……Hz.
The columns are only half as wide as in Illustration 190 because the resolution has doubled.
