Noise Reduction Manual

For more information see click and crackle removal on

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: tails the function of each control in the Vinyl Restoration dialog. Click removal amount (1 to 20) This slider controls the amount of clicks and pops that will be removed from the selection. A setting of 1 means that only very large clicks will be removed. A setting of 20 means that both very small and very large transient noise will be detected and removed. We recommend setting this control between 3 and 18. When the settings is below 3, clicks are harder to detect and settings above 18 may cause false click detection. Reduce noise by This slider determines the amount of noise reduction that will be applied to the sample: 0 dB represents no noise reduction and 100 dB represents the maximum possible noise reduction. We recommend values between 6 and 20 dB to prevent removing too much sound or creating artifacts. CHP. 4 VINYL RESTORATION 44 Affect frequencies above (100 to 10,000 Hz) This slider sets the “bottom” frequency at which noise reduction is used. Only frequencies at and above this setting are affected by noise reduction. If noise reduction is removing too much high-frequency content, you can raise the start frequency (or lower the Reduce noise by setting and the Noise floor setting). Attack speed The Attack speed slider determines how quickly the noise reduction algorithm reacts to a noiseless signal. Lower values often remove fast transients from a sound, while very fast values can create audible artifacts during fast attacks. Release speed The Release speed slider determines how quickly the noise reduction algorithm reacts to a noisy signal. Higher values can cause the algorithm to trim the ends of long decaying sounds. Noise floor (-Inf. to -40 dB) The Noise floor slider determines the level of sound that is considered to be noise. Noise reduction is applied only to signals below this setting. In most circumstances, we recommend a setting between -60 and -85 dB. Raise the noise floor for very noisy recordings. VINYL RESTORATION CHP. 4 45 CHAPTER 5 Clipped Peak Restoration The Clipped Peak Restoration plug-in can make the difference between throwing away a once-in-a-lifetime recorded take that contains some clipping and having a virtually distortion-free recording. Clipping occurs when an audio signal reaches the maximum allowed level in a digital format. The waveform is effectively truncated at that maximum level. Unlike in analog systems, where clipping is gradual and non-linear, digital clipping creates a flat line on top of a waveform. The resulting sound, depending on the source and the severity of the overload, will often add a harsh, distorted quality to the audio, usually making it unusable. Clipped Peak Restoration recovers the signal lost due to clipping and reduces the harsh distortion. Clipped Peak Restoration “rounds” the tops of clipped peaks and applies peak limiting to the area immediately surrounding the audio clip. Non-clipped audio is not affected. Although this plug-in is designed to be used on the entire file without affecting the source audio, it can also be used on smaller selections of the audio file. Note: C lipped Peak Restoration should only be used for material in which clipping is minimal. Heavily distorted material where most peaks are clipped is often not salvageable. CHP. 5 CLIPPED PEAK RESTORATION 46 Using Clipped Peak Restoration In most cases, you should use the default settings for the Clipped Peak Restoration presets: • No attenuation, limit clips - Only the clipped peaks are attenuated, or limited, after fixing. • -3 dB with limiter - Reduces the overall volume of your audio file by 3 dB to allow headroom for restored peaks and applies a compression to clipped peaks to prevent further clipping. • -6 dB, no limiter - Reduces the overall volume of your audio file by 6 dB to allow headroom for restored peaks. Adjust the Attenuation slider if you experience clipping. • Default all parameters - Resets all controls on the dialog. Clipped Peak Restoration reference This section details the function of each control in the Clipped Peak Restoration dialog. Attenuation (0 to -24 dB) The Attenuation slider reduces the volume of your audio file to create headroom for the reconstructed clipped peaks. If you select the Enable Post-Limiter check box, no Attenuation adjustment is required. CLIPPED PEAK RESTORATION CHP. 5 47 Enable Post-Limiter Select the Enable Post-Limiter check box to apply compression to clipped peaks before restoration. Compression ensures that no further clipping will occur. Note: If you disable the Enable Post-Limiter check box, you must use the Attenuation slider to allow for the reconstructed clipped peaks. Cross fade edges (On/Off) Select the Crossfade edges check box to cross fade the beginning and end of your selection during clipped peak restoration. Cross fading prevents audible clicks from being produced during restoration. With this check box enabled, you can make small selections and process the clipped sections. CHP. 5 CLIPPED PEAK RESTORATION 48 CLIPPED PEAK RESTOR...
View Full Document

This note was uploaded on 05/15/2013 for the course EMUS 201 taught by Professor Pardal during the Winter '10 term at Life.

Ask a homework question - tutors are online