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Notch filter - Definition and Overview |
| Related Words: Bolt, Butterfly, Cheesecloth, Clean, Clear, Cloth, Colander, Condense, Cradle, Discharge, Distill, Drain, Drip, Drop, Emit |
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A notch filter, also called a band-stop filter, sometimes a narrow band-pass filter, or T-notch filter, is an electronic filter typically used when the high frequency and the low frequency are less than 1 to 2 decades apart (that is, the high frequency is less than 10 to 20 times the low frequency).
In the audio band, a notch filter uses high and low frequencies that may be only semitones apart.
Example 1: Anti-hum filter
- Low Freq: 59 Hz
- High Freq: 61 Hz
- this means that the filter passes all frequencies, except for the range of 59-61Hz.
Example 2: Anti-presence filter
- Low Freq: 1000 Hz
- High Freq: 4000 Hz
See also: FM radio, Q factor
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