notch filter


Also found in: Acronyms.

notch filter

[′näch ‚fil·tər]
(electronics)
A band-rejection filter that produces a sharp notch in the frequency response curve of a system; used in television transmitters to provide attenuation at the low-frequency end of the channel, to prevent possible interference with the sound carrier of the next lower channel.

Filter, Notch

 

a type of rejection filter. A notch filter is a two-terminal network, usually a parallel resonant circuit, that is inserted into an electric circuit. The impedance of the network increases sharply in a certain relatively narrow frequency band. A notch filter attenuates alternating currents in the particular frequency band and transmits currents at frequencies outside the band.

notch filter

A type of bandstop filter that reduces a narrow range of frequencies. For example, a notch filter in a musical instrument amplifier may reduce frequencies in the range of 59 to 61 Hz, which is sufficient to eliminate any hum coming from the 60 Hz power line. See bandstop filter.
References in periodicals archive ?
Thus, a twin-T notch filter with a 60HZ cut off frequency was used to eliminate the powerline noise; additionally, a variable quality factor is achieved with a potentiometer that not only enhances the efficiency of the filter but also reduces errors.
The variation of the bandwidth of the notch filter stopband around -3 dB provided by (21) is indicated, taking into account M = 2, some values of J and L, f = ([omega]/2[pi]) x [f.sub.s], and [f.sub.s] = 5 kHz.
For "Book Page 2", Triangle, Hermite, Quadratic, Cubic B-Spline, Gaussian and Notch filters were constantly the best.
Bakhshai, "Time-domain Signal Analysis using Adaptive Notch Filter", IEEE Transactions on Signal Processing, vol.
Instead, it is implemented, together an adaptive notch filter, namely ANF-FXLMS algorithm.
Pei and Tseng [64] propose a method to decrease the transient time of multiple IIR notch filters. This technique uses the vector projection in order to find better initial values for the IIR notch filter.
Li, "Performance analysis of the notch filter for RF interference suppression in ultra-wideband SAR," Proc.
The experimental setup is divided into three parts, in first part ECG signals processed to remove baseline wander noise by designed FIR and IIR highpass filters, in second part high passed ECG signals passed through lowpass FIR and IIR filters to remove muscle noise artifact and in third part IIR notch filter used to remove 50/60 Hz power component noise as shown in Fig.
The first step of this approach uses an adaptive notch filter to eliminate the DC component of the ECG.
Using digital signal processing techniques automatic gain control, notch filter and band pass filter have been incorporated for initial processing of raw data to enhance the weak events from far offsets and suppress any coherent noise.
* Notch filter and velocity/acceleration feedforward.
The full closed-loop control, auto notch filter, vibration suppression and gantry control functions of ASDA-A2 help to perform complex motions that require high precision and smooth operation.