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Big Click Filter
The Big Click Filter (BCF) handles exactly what the name implies which includes the elimination of very large clicks but also loud thuds. Its response intentionally ignores smaller clicks and ticks. Its response covers the long time interval range of events lasting greater than 2 mSec but less than 200 mSec. Its detector is actually sensitive to the time amplitude product of the applied signal. This parameter is user adjustable by way of the “ratio” control which has a range which can be varied between 0.75 and 2.5. 1.4 is a good starting place with higher values decreasing the filters aggressiveness and lower values increasing aggressiveness.
Figure 57 – Big Click Impulse Filter
This filter is very useful for fixing big clicks caused by phonograph records that are cracked or have been glued back together or have major gouges on their surface. It is also very useful for interpolating some of the long lived noises found on 16 inch acetate transcription recordings. Finally, it has a Forensics audio application in that it can attenuate cell phone noise interference from audio recordings. The BCF will not remove nominal clicks, ticks or crackle from a recording; use the EZ Impulse filter to remove those noises after running the BCF. Big clicks should always be removed as the first step of the de-clicking process before attempting to remove smaller impulsive noise using any of the other Impulse filters. The interpolation portion of the algorithm uses a frequency domain technique. Big Click Signals which last up to 200 mSec are able to be handled by this filter. A minimum impulse size of 2 mSec can be handled by the BCF. Very large clicks and thuds sometimes excite the resonance of a tone arm leaving behind a long-lived low frequency “tail” or “thump”. This tone arm resonant “thump” can be dramatically reduced by checking the checkbox labeled “De-Thump” which rejects the de-clicked “tail” for a period of time of 150 mSec past the end of the interpolation portion of the Big Click Filter algorithm. It is important to note that the “De-Thump” function will only remove “Thumps” that are preceded by a large click event; it is not capable of removing stand-alone thumps from recordings.
The Big Click filter has the following controls and indicators with the following ranges of adjustment:
A demo .wav file is provided in the Wavefiles folder within your Diamond Cut Directory called “BigClickCracked78Demo.wav”. Use this file to experiment with the Big Click Filter.
Note: Always use the BCF as the first step in your restoration process (assuming that you have a Big Click Issue). Use the other Impulse Filters as the next step(s).
The Big Click Filter (BCF) handles exactly what the name implies which includes the elimination of very large clicks but also loud thuds. Its response intentionally ignores smaller clicks and ticks. Its response covers the long time interval range of events lasting greater than 2 mSec but less than 200 mSec. Its detector is actually sensitive to the time amplitude product of the applied signal. This parameter is user adjustable by way of the “ratio” control which has a range which can be varied between 0.75 and 2.5. 1.4 is a good starting place with higher values decreasing the filters aggressiveness and lower values increasing aggressiveness.
Figure 57 – Big Click Impulse Filter
This filter is very useful for fixing big clicks caused by phonograph records that are cracked or have been glued back together or have major gouges on their surface. It is also very useful for interpolating some of the long lived noises found on 16 inch acetate transcription recordings. Finally, it has a Forensics audio application in that it can attenuate cell phone noise interference from audio recordings. The BCF will not remove nominal clicks, ticks or crackle from a recording; use the EZ Impulse filter to remove those noises after running the BCF. Big clicks should always be removed as the first step of the de-clicking process before attempting to remove smaller impulsive noise using any of the other Impulse filters. The interpolation portion of the algorithm uses a frequency domain technique. Big Click Signals which last up to 200 mSec are able to be handled by this filter. A minimum impulse size of 2 mSec can be handled by the BCF. Very large clicks and thuds sometimes excite the resonance of a tone arm leaving behind a long-lived low frequency “tail” or “thump”. This tone arm resonant “thump” can be dramatically reduced by checking the checkbox labeled “De-Thump” which rejects the de-clicked “tail” for a period of time of 150 mSec past the end of the interpolation portion of the Big Click Filter algorithm. It is important to note that the “De-Thump” function will only remove “Thumps” that are preceded by a large click event; it is not capable of removing stand-alone thumps from recordings.
The Big Click filter has the following controls and indicators with the following ranges of adjustment:
- Ratio: 0.75 to 2.5 (Lower Values generally produce more aggressive results)
- Events: Records the number of events found and repaired by the filter
- Events Bar Graph: Indicates the number of events being found and repaired per unit of time.
- De-Thump Checkbox: Attenuates resonant ring-out tails following the repair time interval associated with this filter. Only use this function for the repair of large clicks associated with cracked or broken phonograph records. This function can’t be “hot-switched” while previewing.
A demo .wav file is provided in the Wavefiles folder within your Diamond Cut Directory called “BigClickCracked78Demo.wav”. Use this file to experiment with the Big Click Filter.
Note: Always use the BCF as the first step in your restoration process (assuming that you have a Big Click Issue). Use the other Impulse Filters as the next step(s).