YOKOGAWA DL750 - Page 698

App-25
IM 701210-06E
Appendix
App
Appendix 6 DSP Channel Computation (Optional)
SHARP Filter
Characteristics
• Low-pass and high-pass
• The ripple in the pass band is within 0.3 dB.
• The attenuation falls to –40 dB at twice (low-pass) and 1/2 (high-pass) the cutoff
frequency.
• The attenuation in the stop band is –40 dB or greater.
• Has linear phase characteristics and constant group delay.
–80
–60
–40
–20
0
0 f 0.1 f 0.2 f 0.3 f 0.4 f 0.5 f
fc 2 fc
0.3 dB
–40 dB
SHARP Low-pass Frequency Characteristics Example
dB
–80
–60
–40
–20
0
0 f 0.1 f 0.2 f 0.3 f 0.4 f 0.5 f
fc
1/2 fc
0.3 dB
–40 dB
SHARP High-pass Frequency Characteristics Example
dB
(f: sampling frequency [Hz])