notch filter

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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.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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

An electronic circuit that reduces a narrow range of frequencies. A notch filter is a type of bandstop filter. For example, in a musical instrument amplifier, a notch filter may reduce the frequencies within the range of 59 to 61 Hz, which is sufficient to eliminate any hum coming from the 60 Hz power line. See bandstop filter.

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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.

Designing Non contact based ECG System for Driver Drowsiness Detection

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.

Enhancement of the Comb Filtering Selectivity Using Iterative Moving Average for Periodic Waveform and Harmonic Elimination

For "Book Page 2", Triangle, Hermite, Quadratic, Cubic B-Spline, Gaussian and Notch filters were constantly the best.

MRC--THE PROPOSED DOCUMENT IMAGE COMPRESSION SCHEME

Bakhshai, "Time-domain Signal Analysis using Adaptive Notch Filter", IEEE Transactions on Signal Processing, vol.

Variable Sampling Composite Observer Based Frequency Locked Loop and its Application in Grid Connected System

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.

Fetal ECG extraction from abdominal signals: a review on suppression of fundamental power line interference component and its harmonics

Li, "Performance analysis of the notch filter for RF interference suppression in ultra-wideband SAR," Proc.

The RFI suppression method based on STFT applied to SAR

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.

Survey of Wearable Sensors with Comparative Study of Noise Reduction ECG Filters

The first step of this approach uses an adaptive notch filter to eliminate the DC component of the ECG.

A hierarchical method for removal of baseline drift from biomedical signals: application in ECG analysis

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.

Low cost PC-based seismic refraction recording system

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.