X-Noise User Manual
Contents
1. After creating the noise profile cancel the selection of the noise only segment to operate on the whole sound file While playing the recording adjust the Threshold and Reduction controls to the desired amount of noise reduction Threshold sets the level at which the noise profile is used to distinguish between the sound source and the noise Setting the Threshold to 10 dB typically means that the noise level is below the noise profile and therefore subject to removal Use the Reduction control to set the amount of noise reduction applied Increasing the Reduction setting increases the amount of noise removed from below the noise profile If time aliasing artifacts singing or robot like sounds appear decrease the Reduction setting and increase the Threshold about 30 dB above the background noise Artifacts can be further minimized by adjusting the Attack Release Resolution and High Shelf parameters see Controls for more details Waves X Noise software guide page 4 of 12 STEP 3 MONITORING One of X Noise s great features is the ability to monitor either the normal Audio output or the Difference signal removed by X Noise s current settings Listen carefully to the Difference signal to determine whether your settings removed parts of the audio signal in addition to the noise The goal is to maximize noise reduction while capturing and degrading as little of the audio as possible We recommend monitoring with headphones and monitori2. At this point we recommend saving your X Noise setup which includes the noise profile If the source material does not have a section containing the pure noise you want to remove you cannot create a noise profile and must instead use one of the factory presets This method generally compromises noise reduction efficiency because isolating the noise from the audio is less accurate which leads to more audible artifacts Important Note The noise profile should be created from the source recording used as the input to X Noise Creating a noise profile from a different source will not help X Noise recognize the noise in your source However if you cannot find a noise only segment in your source but can find one from the same recording session under the same conditions you can use it instead and obtain good results SAVING LOADING AND SHARING NOISE PROFILES The WaveSystem includes a Save button that stores the noise profile in the setup file along with other parameter data Each X Noise setup file has two spaces available for noise profiles allowing analysis and storage of two segments of noise which can be easily compared to see which works best Waves X Noise software guide page 10 of 12 After creating a noise profile an asterisk indicates that the setup has been modified in the Setup A B name bar This noise profile can be saved into a new setup or over the current one A noise profile can be loaded by itself from any previously save
3. disturbances should be treated first by X Click X Crackle or both X Noise connects to an audio host application through its plug in architecture The algorithm is based on a single ended broadband real time noise reduction principle that uses frequency domain analysis to detect and reduce unwanted noise from the source e Single ended means that X Noise does not rely on any complementary encode decode processing applied during recording and playback i e Dolby NR e Broadband refers to the wide frequency range from which noise is removed high frequency hiss and low frequency rumble can both be targeted e Real time operation allows you to adjust the parameters and hear the results immediately How Does X Noise WorRK X Noise can earn the character of the disturbing noise from a segment of the original recording containing only the noise to be removed This segment is typically obtained from the recording s beginning or end or a gap in the audio X Noise uses this data to construct a noise profile that helps distinguish the noise from the audio data X Noise employs the most recent psychoacoustic research and multilevel decision algorithms to remove noise while preserving the sonic clarity of the Waves X Noise software guide page 2 of 12 source It performs better than comparable DAW tools and as well or better than more expensive dedicated hardware solutions X Noise reduces noise while minimizing artifacts and other da
4. Waves X Noise Software Audio Processor Users Guide Undo Setup 4 4 gt B Load Save y 4 Thresh Reduction Dynamics IR x Output 20 0 75 Attack 30 Release 400 High Shelf Freq 3168 Gain Resolution Low Med Noise Profile Difference X Noise In this manual 1 IMMOQUCTION 0 2205 02 20s2seccseeeeereese cicengereeesens 2 2 USING X NOISC 2 ccc ccc ecceneenteeneeaeenseees 4 3 Controls ANd DiSPIlAYS 0cccccececceneenees 6 4 Noise Proftile 0 0 cccecccencceneeeceeeneeeneeens 10 5 Important information and useful tips 12 The Noise Reduction Technology licensed from Algorithmix GmbH Germany All rights reserved Waves X Noise software guide page 1 of 12 1 Introduction Waves X Noise reduces noise with minimal signal degradation while preserving excellent audio quality X Noise is part of the Waves Restoration bundle which removes clicks crackles and hum from vinyl records and damaged recordings X Noise and the other Restoration plug ins have a friendly interface that is easy to learn and use This user guide describes e the problems X Noise solves e how to use the software e the software user interface Click the on the toolbar for online help Thanks for using X Noise and enjoy WHAT PROBLEMS Does X NOISE FIX X Noise is ideal for removing background noise caused by tape hiss and air conditioner ventilation systems Loud short impulse noise and discrete signal
5. d setup This can be useful if other sessions need to be processed from the same recording conditions Waves X Noise software guide page 11 of 12 5 Important information and Useful Tips LATENCY To properly perform its task X Noise must look ahead to into the future It manages this incredible feat by delaying the source signal by 5120 samples about 116 ms in CD quality material This is particularly significant when the noisy track runs along with other tracks To maintain sync other tracks should be delayed by the same amount There is no way to avoid this in live recording situations therefore X Noise is not recommended when monitoring a live event To use X Noise in a sound file editor it is important that the editor is able to compensate for the plug in s delay If this feature is not available in your host add at least 5120 samples of silence at the end of the file and trim the start after the process is done STORING AND RECALLING THE NOISE PROFILE Some audio host applications cannot store the noise profile data with the other plug in settings This means that saving a high level document such as a session song or work that includes X Noise may not store the noise profile associated with that audio We recommend saving setups within the WaveSystem to insure that the noise profile is saved SIDE EFFECTS X Noise creates minimal audible artifacts Those produced are usually time aliasing artifacts referred to as leftover
6. in If you hear smearing of fast audio events lower the resolution Settings Low Med High Default Med We recommend creating the noise profile and processing your sound source with the same resolution although it is possible to change between them NOISE PROFILE Noise Profile Learn Noise Profile F E J The Noise Profile is created by analyzing an audio segment containing a representative sample of the noise you wish to remove Best results are obtained when the section selected for analysis consists only of the background noise you want to remove Click the Learn button to begin the process the button changes to Learning and blinks red yellow until it is stopped when clicked again It is important to emphasize that no noise reduction occurs while learning the noise profile See Noise Profiles for more information OUTPUT MONITOR Difference The Output Monitor switches between Audio the audio processed by X Noise and Difference the noise currently removed with selected settings Audio is the default setting in which the process outcome is monitored Use the Difference setting to hear the noise being removed from the source signal If audio is present in the Difference signal modify your settings to achieve a better balance between noise reduction and signal loss degradation Waves X Noise software guide page 8 of 12 DISPLAYS NR Noise REDUCTION METER The Noise Reduction Meter shows the amplitude of noise
7. mage to the source recording X Noise s controls are similar to a dynamics processor Those familiar with a typical compressor expander should get excellent results within a few minutes of experimentation Waves X Noise software guide page 3 of 12 2 Using X Noise X Noise uses two primary parameters Threshold and Reduction to control the noise reduction process Adjust these controls first to quickly configure X Noise for a given input signal Resolution Dynamics and High Shelf parameters offer more detailed control For a complete user interface reference see Controls and Displays The following example will get you started using X Noise STEP 1 CREATE A NOISE PROFILE Create a noise profile by selecting an audio section from the source recording at least 100 ms containing just the noise that you want to remove Click the Learn button in the Noise Profile area below the X Noise Analyzer The button blinks and displays Learning Noise Profile ee ing Play this section through X Noise Click the Learn button again to stop the learning process and create the noise profile which appears as a white line on the X Noise Analyzer The line represents the frequency content of the analyzed noise At this point save your X Noise setup which includes your noise profile If you cannot find a noise only section try the default white noise profile or one of the other available factory presets STEP 2 NOISE REDUCTION
8. n has reached its peak Longer times preserve more ambience Shorter times are useful for reducing noise in speech for forensic applications Settings 0 10 000 s Default 0 400 s High Shelf High Shelf Freq 3168 Gain The High Shelf modifies how X Noise operates on high frequencies it is not an EQ filter in the signal path but a Noise Profile modifier Adding gain to high frequencies of the profile will call for more reduction of that spectrum and vice versa FREQ Controls the frequency above which the noise profile is modified Settings 700 Hz 20 kHz Default 4006 Hz GAIN Controls the attenuation applied to high frequencies Increasing the gain raises the threshold for frequencies above the shelf cutoff frequency and the algorithm reduces more noise in that spectrum Decreasing the gain lowers the threshold for the frequencies above the cutoff frequency resulting in less noise reduction in the high frequencies Settings 30 to 30 dB Default 0 dB RESOLUTION Resolution Resolution controls how fine the analysis engine is which affects the amount of CPU resources used by the X Noise algorithm The High setting consumes more resources to analyze and process the audio data and results in the best audio Slower CPUs will operate better using the Med or Low settings The highest Waves X Noise software guide page 7 of 12 resolution is the finest one in the frequency domain but not in the time doma
9. ng between Audio and Difference several times until the right balance is found Heavily damaged recordings may require a compromise between audio quality and noise reduction Waves X Noise software guide page 5 of 12 3 Controls and Displays CONTROLS Thresh Reduction 20 0 75 THRESHOLD Represents the level of the noise profile The signal below the noise profile is removed while the signal above the profile is not processed Settings 20 to 50 dB Default 0 dB REDUCTION Determines the amount of noise reduction applied to the signal below the Threshold 0 serves as a smooth setting that reduces a small amount of noise Settings 0 100 Default 0 Dynamics ATTACK Sets the time from when noise is first detected to the noise reduction s peak level set with the Reduction control During the Attack time noise reduction is smoothly increased to avoid pops and clicks from abrupt processing The default setting 0 03 s works well in most cases Impulsive sounds may require a shorter time sounds that evolve more slowly may require a longer time Settings 0 1 000 s Default 0 030 s Waves X Noise software guide page 6 of 12 RELEASE Sets the time in which the noise reduction is smoothly decreased from the peak setting to 0 Like the Attack parameter this gradual decrease avoids pops and clicks resulting from abrupt processing The Release time begins after the Attack time has elapsed and the noise reductio
10. removed The meter level correlates to the sound level monitored with the Difference setting X NOISE ANALYZER The X Noise Analyzer is the plug in s main display It shows three colored spectral envelopes e Red the input signal before X Noise processing e White the noise profile e Green the output signal after X Noise processing A healthy noise reduction process usually has the green output signal line mostly below the red input signal line but the peaks that cut through the profile can overlap red and green Waves X Noise software guide page 9 of 12 4 Noise Profile WHAT IS A NOISE PROFILE A noise profile is a segment of data that represents a normalized portion of the noise targeted for removal X Noise uses this data to analyze the entire audio input for noise with the same characteristics CREATING A NOISE PROFILE To create an effective noise profile try to find a section at least 100 ms containing only pure noise in the source recording These sections are typically found before the audio begins after it ends or during a pause in the speech or music Select and play this segment through X Noise and click the Learn button below the Analyzer The button changes to Learning and blinks to indicate that X Noise is creating the noise profile Click again to stop the Learning process and return to normal processing mode The spectrum of the noise is displayed in the X Noise Analyzer as a white line
11. s gremlins singing robots and blips that sound like whistles or lingering oscillations These can be treated by first lengthening the Attack and or Release times If the artifacts remain choose more moderate Threshold and Reduction settings Waves X Noise software guide page 12 of 12
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