notch filter meaning

• [Electronics]
  A circuit that exhibits high attenuation at and near a single frequency and little or no attenuation at all other frequencies. This type of device is used in some radio communications receivers, and can reduce interference caused by strong, unmodulated carriers within the pass-band. The notch frequency is adjustable, so that the deep null can be tuned to any frequency within the receiver passband. A properly designed circuit can produce attenuation in excess of 40 dB in the center of the notch. Some sophisticated types, especially audio designs, can provide more than 60 dB of attenuation at the notch frequency. Audio notch filters employ operational amplifiers with resistance-capacitance (RC) circuits. In some audio notch filters, the notch width (sharpness) and frequency are both adjustable. Compare BAND-REJECTION FILTER.
  

• Realization of current-mode all-pass notch filter using single ftfn
• 50hz interference is filtered by using digital notch filter
• Time delay notch filter design to reduce residual vibration of flexible structure
• Rejecting harmonic interference in twacs using iir notch filter based on all-pass filter
• Unbalance compensation based on adaptive notch filter to active magnetic bearings
• Active notch filter
• Simple gain tuning built-in 10 levels of system stiffness and on-line off-line auto gain tnuing notch filter
• The possibility of gaining reference signal by the use of signal frequency estimation through the approach of adaptive notch filter is studied
• For rfi and narrowband noise interferences, this dissertation studies notch filter and spectrum equilibrium and uses them to suppress narrow jammings in signal domain
• Adaptive algorithms are often used to automatically tune these notch filters.

• "notch filter" meaning in Chinese: 凹口滤波器
• "notch filter" meaning in Japanese: ノッチ?フィルター◆特定の狭い周波数帯域のみをカットするフィルター
• "notch filter" meaning in Russian: узкополосный режекторвый фильтр, фильтр-пробка