High-pass

Transducers twelve 375 kHz resonant transducers have been used, with a 350 kHz cutoff frequency high pass filter section and a 40 dB preamplifier. 

In addition to the distortions caused by the probes, there were also distortions caused by filtering the signals within the eddy-current test instruments. To achieve the highest possible dynamics with the test instruments, high-pass filters with a high rate of rise, but also a long reverberation time were used. Thus, the recorded C-scan pictures sometimes shows strong echo effects. 

Figure B-2 A simple zero differentiator or high-pass filter.

The first method uses high-frequency vibration components that result from oscillating rotor bars. Typically, these frequencies are well above the normal maximum frequency used to establish the broadband signature. If this is the case, a high-pass filter such as high-frequency domain can be used to monitor the condition of the rotor bars. 

Jones, R., High-Pass and Band-Pass Digital Filtering with Peak to Trough Measurement Applied to Quantitative Ultraviolet Spectrometry, Analyst 112, November 1987, 1495-1498. 

High-pass filter A filter used to select a coherence order > p. INADEQUATE Correlation spectroscopy in which the directly bonded C nuclei are identified. 

Figure 2.15. Schematic of a quadrupole analyzer, (a) A hyperbolic cross-section (b) cross-section of cylindrical rods (c) the operating principle of a quadrupole mass filter. The x-direction pair of rods acts like a high pass filter so ion C (with low m/z) is not allowed through, and the y-direction pair of rods acts like a low pass filter and takes care of ion A (with high m/z). Only ion B having an m/z in the stable range is allowed through the quadrupole mass filter for subsequent detection. Reprinted from A. Westman-Brinkmalm and G. Brinkmalm (2002). In Mass Spectrometry and Hyphenated Techniques in Neuropeptide Research, J. Silberring and R. Ekman (eds.) New York John Wiley Sons, 47-105. With permission of John Wiley Sons, Inc.

A col is a high pass through a mountain range or a saddle-like depression in the crest of a ridge. 

Fourth-Order Butterworth High Pass Filter... 

A quick modification to the circuit in Fig. 3.1 produces a high pass filter response. The schematic for the high pass filter is shown in Fig. 3.7, and its AC response is shown in Fig. 3.8. 

The same pulse as in the low pass filter was applied to the high pass filter. The breadboard results are shown in Fig. 3.9. These may be compared with the IsSpice results shown in Fig. 3.10. The top trace is the 5 V pulse, while the bottom trace is the filter response measured at the output of op-amp X6. 

Figure 3.7 Schematic of fourth-order Butterworth high pass filter. 

A quick modification to the Bessel-Thompson filter leaves us with a high pass filter. This filter does not have the built-in delay like the low pass version, but it does provide an interesting response. The schematic and the breadboard results are shown in Fig. 3.36 and Fig. 3.37, respectively. The measurements that will be made for comparison purposes are the step response height and the time until the second cross of the zero axis. 

Figure 3.60 Chebyshev high pass filter measured results.

Figure 3.62 IsSpice Chebyshev high pass filter.

---