Modern top models are fully computerized, using integrated circuit technology to allow the user to set sensitivity, discrimination, track speed, threshold volume, notch filters, etc ., and hold these parameters in memory for future use.
42.
Some BPL providers have installed notch filters to block out certain portions of the spectrum ( namely the amateur radio bands ), but a great amount of controversy over the deployment of this access method remains.
43.
If shimmy can not be designed out of the system, a device known as a steering damper may be used which is essentially a notch filter designed to damp the shimmy at its known natural frequency.
44.
It may also be possible to introduce narrow notch filters at the power frequency and its lower harmonics; however, this can not be done in audio systems due to the objectionable audible effects on the wanted signal.
45.
An alternative technique, total harmonic distortion measurement, cancels out the fundamental with a notch filter and measures the total remaining signal, which is total harmonic distortion plus noise; it does not give the harmonic-by-harmonic detail of an analyser.
46.
Also, since both piezoelectric transducers and microphones are more prone to unwanted feedback than magnetic pickups, the bass tech may have to set up a notch filter with a parametric equalizer to reduce the frequency that is feeding back.
47.
Notch filters were used to filter out a " notch " of channels from an analog cable signal ( for example, channels 45-50 could be " notched " out and the subscriber still receives channels below 45 and above 50 ).
48.
Narrow notch filters ( optical ) are used in Raman spectroscopy, live sound reproduction ( public address systems, or PA systems ) and in instrument amplifiers ( especially amplifiers or preamplifiers for acoustic instruments such as acoustic guitar, mandolin, software filters ).
49.
Elastic scattered radiation at the wavelength corresponding to the laser line ( Rayleigh scattering ) is filtered out by either a notch filter, edge pass filter, or a band pass filter, while the rest of the collected light is dispersed onto a detector.
50.
One way to remove the noise is to filter the signal with a notch filter at the mains frequency and its vicinity, which could excessively degrade the quality of the ECG since the heart beat would also likely have frequency components in the rejected range.
