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.

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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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 It might be outdated or ideologically biased.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.

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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

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

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 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

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