A filter which blocks a narrow band of frequencies and passes all frequencies above and below the band.
A notch filter helps to remove a small section of the video signal that contains excess color information. This helps to eliminate some unwanted color effects. The circuit however contributes to a small degradation in picture resolution.
A special type of cut-only equalizer used to attenuate ( only, no boosting provisions exist) a narrow band of frequencies. Three controls: frequency, bandwidth and depth, determine the notch. Simplified units provide only one or two controls, with bandwidth and/or depth fixed internally. Used most often in acoustic feedback control to eliminate a small band of frequencies where the system wants to howl (feedback). See narrow-band filter.
A device which allows the lowering of the level of a narrow portion of the frequency spectrum. Useful in cutting out unwanted sounds.
A band rejection filter that produces a sharp notch in the frequency response of a system, thus reducing the gain or amplitude of a narrow band of frequencies centered on a given frequency.
A notch filter removes a very narrow slice from a received signal. either from the radio frequency itself (RF notch) or from the audio output (audio notch) of the receiver
Permits the passage of signal in a specified range while attenuating signal below and above that defined range.
An electronic filter that removes a very narrow band of frequencies around a given point. Typical notch filters are 1/10 of an octave wide or less. Used to remove a problematic frequency that causes feedback. When using filters this narrow, a change in temperature and/or humidity can affect the problematic frequency, thus the notch filter will need to be re-tuned.
a band-stop filter with a narrow stopband (high Q factor )
a device that suppresses emissions across a narrow band of channels, with comparatively little effect on surrounding frequencies
a filter that passes all frequencies except those in a stop band centered on a center frequency
an anti-resonance (band-reject) filter used to counteract a physical resonance
a narrow band-reject filter
a passive device that rejects a particular set of frequencies while having little effect on all other frequencies
a specialized equalizer that utilizes selectable bands with adjustable frequency slope width and filter resonance
a specific type of band - stop filter that acts on a particularly narrow range of frequencies
a very special kind of EQ, an extremely narrow and deep cut of an audio frequency band
An electronic filter that suppresses a small portion of a frequency range. A common use is as an inexpensive substitute for a video comb filter, where the frequencies used by the color information in a composite video signal are prevented from entering the luminance amplifier.
A band rejection filter that produces a sharp notch (high Q) in the frequency response of a system, thus reducing the gain for a narrow range of frequencies.
A circuit which effectively separates the NTSC black and white information from the color 3.58 MHz carrier signal. The name is based on the fact that the circuit takes a notch out of the frequency band.
a fixed-level, variable-frequency filter found on some preamps that isolates a specific frequency (usually in the low-mids area of the tonal spectrum) to eliminate feedback or unwanted resonance from the body of the guitar.
In video systems, this removes a small part of the TV signal where color information is most concentrated, reducing unwanted artifacts from less-than-perfect signals. See also Comb filter
A filter that rejects a narrow band of frequencies. It is used to attenuate specific frequencies such as a 60 Hz line induced hum from audio signals.
Rejection band filter, typically has a transmission range on both sides of blocking range.
An electronic device which can remove unwanted frequencies with only minimal disturbance to those on either side