Windows Blackman-Harris (4-term with –92 dB sidelobes),
–see Figures 56 and 37. Hann,
Flat-top,
Equiripple (AP design with –160 dB sidelobes),
None,
None, move to bin center,
Hamming,
Gaussian,
Rife-Vincent 4-term,
Rife-Vincent 5-term.
Move to bin center Window
Frequency Range ±4% of input frequency, 7
th
FFT bin (low limit),
to 0.45 x f
s
(high limit).
Spurious Products <–120 dB.
DSP Audio Analyzer
with “Analyzer” DSP program
Wideband Level/Amplitude
Accuracy (1 kHz) ±0.09 dB [±1.0%]
Frequency Range <10 Hz to 45% of Sample Rate
[10 Hz–21.6 kHz at 48 ks/s].
High pass Filters <10 Hz 4-pole,
22 Hz 4-pole,
100 Hz 4-pole,
400 Hz 4-pole (4-pole Butterworth or 10-pole
elliptic if no other filters are enabled).
Low pass Filters F
S
/2 (maximum bandwidth),
20 kHz (6-pole elliptic),
15 kHz (6-pole elliptic).
Weighting Filters ANSI-IEC “A” weighting, per IEC Rec 179,
CCIR QPk per IEC468 (CCIR),
CCIR RMS per AES17,
C-message per IEEE Std 743-1978,
CCITT per CCITT Rec. O.41,
“F” weighting corresponding to 15 phon loudness
contour, –see Figure 58
HI-2 Harmonic weighting.
DSP Analysis of Analog Signals Chapter 6: Specifications
Getting Started with Your 2700 Series Instrument 71
Figure 56. Windowing functions for FFT (A)
Figure 57. Windowing functions for FFT (B)
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