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Narrow Crackle Filter
The Diamond Cut Narrow Crackle Filter (NCF) is a special impulse filter designed to identify and interpolate narrow pulse-width crackle type noise. It is especially effective on mint condition LPs having only very small impulsive noise due to vinyl defects or static electricity discharge effects. This filter is also useful on other recording types provided that larger impulsive noises have been removed by one of the other Diamond Cut Impulse Noise filters first. Additionally, it can be used to remove some power-line frequency related high frequency “buzz” (which is high frequency & harmonically rich “hum”). The advantage of the Narrow Crackle filter is that it is the least invasive of all of the impulse noise reduction filters in the Diamond Cut suite. We have found it to be effective in reducing the residual crackle sounds on not only Vinyl LPs, but also transcription acetate recordings and 78s after all of the other impulsive noises have been removed first. It is not effective for removing impulses due to poor record handling; use the EZ Impulse filter for those situations. The Narrow Crackle Impulse Noise Filter is very easy to operate, having only two controls which are as follows:
The Narrow Crackle Impulse Noise Filter
The Narrow Crackle Filter’s “Events” bar graph provides you with a relative indication of how aggressively the filter is operating. It “modulates” vertically in proportion to the number of events that are being interpolated by the system. The “Keep Residue” feature allows you to hear what the Narrow Crackle Filter is removing from your source signal. A good way to “tweak” this filter is to highlight a short sector (around 10 seconds) of the .wav file that has the type of narrow crackle impulse noise that you desire to eliminate or attenuate. Preview that sector and adjust the two controls for the best result on that 10 second sector. After you are satisfied with your settings, it should then do a fine job on the entire file in “Run Filter” mode.
The Diamond Cut Narrow Crackle Filter (NCF) is a special impulse filter designed to identify and interpolate narrow pulse-width crackle type noise. It is especially effective on mint condition LPs having only very small impulsive noise due to vinyl defects or static electricity discharge effects. This filter is also useful on other recording types provided that larger impulsive noises have been removed by one of the other Diamond Cut Impulse Noise filters first. Additionally, it can be used to remove some power-line frequency related high frequency “buzz” (which is high frequency & harmonically rich “hum”). The advantage of the Narrow Crackle filter is that it is the least invasive of all of the impulse noise reduction filters in the Diamond Cut suite. We have found it to be effective in reducing the residual crackle sounds on not only Vinyl LPs, but also transcription acetate recordings and 78s after all of the other impulsive noises have been removed first. It is not effective for removing impulses due to poor record handling; use the EZ Impulse filter for those situations. The Narrow Crackle Impulse Noise Filter is very easy to operate, having only two controls which are as follows:
- Threshold: This control sets the relative amplitude at which this filter detects narrow crackle impulsive noise having a range of 5 to 100. Adjust this control until downwards until the impulsive noise is reduced but not so low as to reduce the bandwidth or produce distortion on the target signal. A good place to start with on this control is a setting around 30. Settings below 10 can produce distortion and also a Low Pass Filter effect on the signal.
- Size: This parameter sets the pulse width at which the system is sensitive, having a range running from 1 to 15. Larger values of size represent longer pulse width values. Use the smallest value of size to do the job at hand. A good value to start with is around 3 to 5.
The Narrow Crackle Impulse Noise Filter
The Narrow Crackle Filter’s “Events” bar graph provides you with a relative indication of how aggressively the filter is operating. It “modulates” vertically in proportion to the number of events that are being interpolated by the system. The “Keep Residue” feature allows you to hear what the Narrow Crackle Filter is removing from your source signal. A good way to “tweak” this filter is to highlight a short sector (around 10 seconds) of the .wav file that has the type of narrow crackle impulse noise that you desire to eliminate or attenuate. Preview that sector and adjust the two controls for the best result on that 10 second sector. After you are satisfied with your settings, it should then do a fine job on the entire file in “Run Filter” mode.