9. Using Record Cleaner to Clean Recordings Automatically
Four tools in Record Cleaner help eliminate unwanted noise from recordings: Remove Pops & Clicks, Eliminate Hum, Reduce Hiss, and Noise Gate (which measures the levels of each frequency and reduces the ones that are likely to be noise). Each tool is controlled by a slider and allows you to listen to the results before you save the changes.
Pop & Click removal
Scratches, dirt, and wear on the surface of a record can cause pops and clicks in playback. Live recordings sometimes have unwanted loud noises, and tapes can wear in such a way as to have pops and clicks. Unfortunately, those pops and clicks are really annoying when they make their way onto a CD! This tool will help remove them.
Back up your file before starting to use this tool. Our editor provides one level of undo, but sometimes you need more than that, so it's important to be able to go back to the original.
The slider adjusts how aggressive the program is at removing pops and clicks. Near the bottom, the click has to be severe for the program to remove it. When the slider is at the top much less severe clicks will be removed. In general, try to use the slider in as low a position as possible since the click removal algorithm also removes a little bit of sound quality.
If most of a recording is OK but there are a few spots with clicks, select those spots and apply the click removal tool to each one. That way you only affect the part that has the click. Experiment until you find the right combination for each recording.
You may find that it is impossible to remove some clicks using this tool. In those cases we suggest you magnify your view of the area around the click and look for very steep changes in the waveform. These cause the click. Using RipEditBurn Plus and RipEditBurn, you may be able to cut out just a tiny section and remove the click without audibly changing the timing of the music (see Pop and Click Removal with RipEditBurn Plus and RipEditBurn in Section 8).
Professional sound editors may spend many hours cleaning up each section of a recording. We have tried to make the process as easy and automatic as possible, but sometimes you will have to do quite a bit of experimentation. Make sure you back up your file often as you work, so you can go back to a previous version.
Ask any professional sound engineer about hum from power supplies- they will know all about it! There are a variety of things you can do to prevent it, but, if your recording already has it, you'll need this tool.
Technically this is called a "notch filter". It completely eliminates the sound in a narrow band (a "notch"). Back up your file before starting to use this tool. Our editor provides one level of undo, but sometimes you need more than that, so it's important to be able to go back to the original.
If you live in North America the power coming from the power company (sometimes called "mains power") is almost certainly at 60 Hz, or cycles per second. In Europe and much of Asia it is usually at 50 Hz. If you are not certain which hum you are hearing, experiment. If neither one seems to quite do the trick, go to the Effects menu in RipEditBurn Plus or RipEditBurn and click on Notch Filter; that effect will allow you to set the frequency that is being eliminated.
There are many sources of high pitched hiss or crackling in recordings, and this is a good tool for eliminating many kinds of noise from a recording. Back up your file before starting to use this tool. Our editor provides one level of undo, but sometimes you need more than that, so it's important to be able to go back to the original.
Our hiss remover is an equalizer, set up to make it very easy for you to remove high frequencies. Lower slider positions remove less sound, higher ones remove more. Try several different settings to find the one that works the best.
You may find that there are certain sections that need more of this processing than others. Sometimes hiss is especially noticeable in quiet passages. Select each section individually and find the setting you want.
A noise Gate is a special kind of filter that measures the levels of each frequency and reduces the ones that are likely to be noise. A slider controls the amount that is removed.
Very noisy recordings will respond better to a higher amount of noise reduction. If your recording is clean but just has a little noise in the quiet parts a lower setting should work very nicely.
Often it is best to apply this tool only to the sections that are particularly troublesome. Experiment to find the best setting for each recording.