Filtering
- Created by: jessmccamley
- Created on: 20-05-18 10:54
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- Filters
- Common controls
- Cut-off frequency
- The frequency about or below which frequencies will be attenuated (Hz)
- Centre frequency
- The point at which a band-pass or notch filter will have the most effect (Hz)
- Gain
- By how much a signal is attenuated (dB)
- Q
- Bandwidth of frequencies affected by the filter
- High value = narrow range
- Low value = wide range
- Bandwidth of frequencies affected by the filter
- Slope
- How sharply the filter will act at the cut-off
- Cut-off frequency
- LPFs
- Low Pass Filters
- Reduces or cuts all frequencies above the cut-off
- Commonly used on dance music to muffle bass lines
- May boost the gain of those below
- Low Pass Filters
- HPFs
- High pass filter
- Cuts all frequencies below the cut-off
- May boost the gain of those above
- A common use of this is a rumble filter, which has a cut-of of around 80Hz and is designed to eliminate unwanted low frequencies
- High pass filter
- Band-Pass Filter
- Boosts or cuts a pocket of frequencies, with any outside the band being left alone
- When drawn on a graph, it looks like a bell-curve
- Width of the band is determined by the Q value, around the centre frequency
- On common use is a wah-wah pedal, which uses a moving BP that slides up and down the frequency range
- Boosts or cuts a pocket of frequencies, with any outside the band being left alone
- Notch Filter
- Essentially a band-pass with a really high Q value, only attenuating a tiny band of frequencies
- Designed to cut specific frequencies
- Essentially a band-pass with a really high Q value, only attenuating a tiny band of frequencies
- Shelving Filter
- Work at either end of the frequency range to boost or cut the high or low end
- Work from the cut-off frequency to the end of the frequency range, applying even attenuation throughout the bandwidth
- Work at either end of the frequency range to boost or cut the high or low end
- Common controls
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