Audio Restoration

Our Audiocube5TM system is possibly the most powerful Audio Restoration workstation in New England.  It filters audio at an uncommonly high 64-bit floating point precision and gives us unprecedented control over tone and dynamics, as well as noise removal, notch filtering, artifact removal and waveform repair.  Waveforms that have been damaged by interference, artifacts or overmodulation can be rebuilt according to surrounding waveform information.  Even noises that occur mid-word or mid-note can be removed or greatly reduced.  Audiocube5TM is used for restoration by the Smithsonian Institution, U.S. Library of Congress, and the National Archives, as well as a few top Hollywood post houses.  If you would like to send a sample for a free evaluation, please contact us. 



Film Soundtrack Restoration Examples

Modulus regularly handles a variety of problems endemic to film soundtracks.  The following problems can be easily removed or reduced:

  • Clicks and pops from 35mm optical sound
  • Magnetic tape hiss
  • Camera motor noise
  • Lip and wet-mouth noises in voice overs
  • Clicks and pops from analog scratches
  • Clicks and pops from digital edits
  • Azimuth alignment problems
  • Mic boom hits





 


Restore Archival Recordings


Example: Patsy Cline

The severe analog clicks in this Patsy Cline recording had to be removed before any other EQ'ing or filtering could occur.  Our DE-CLICKER works in real-time at extremely high efficiency.  Notice how the voice and other musical instruments (as well as mic noise) are left untouched by the high resolution processing.




Original recording with audible clicks

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After Restoration the file has been de-clicked and cleaned up

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Clean Up Background Noise

Steady-State noise in recordings can be quickly removed (or reduced), leaving the desirable signal untouched.  While editing in Avid or FCP, even quiet background noise can cause problems causing tiny clicks or jarring shifts in ambience.  To fix this problem some producers send material to Modulus while still in the editing process.  The following steady-state noises can be efficiently removed or reduced in real time:

  • Air conditioning and refrigerators
  • Fans and motors
  • Humming or buzzing lights
  • Rumbling trucks (distant freeway)
  • Ocean/lake/water noise (distant)
  • 60 cycle hum / 60 hertz interference
  • Radio frequency interference (RFI)
  • Flourescent lights (buzzing)
  • Op amp / line noise (from gear)
  • Tape hiss from magnetic stock






 


Un-Distortion

Audio engineers will tell you that once a signal gets overmodulated it's distorted for good.  While this is still true, Modulus can do a miraculous job of removing the harsh artifacts of distorted audio that is both for digital and analog distortion. Clipped waveforms are analyzed and rebuilt using surrounding pitch, timbre and amplitude information.  See example below

 


Fix Live Performances

 

Example: Yo Yo Ma

This live recording of Yo Yo Ma has a loud bow strike in the early part of a musical passage.  Because the sound happens over several notes, deleting it would cause a large gap. SPECTRAL INTERPOLATION was used to remove the aberation and keep the music perfectly intact.



Original audio with bow strike

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Restored audio with bow strike removed

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Remove Popped "P"s

 

Example: Ross McElwee

A recording of filmmaker Ross McElwee's post-film discussion had boomy "P's" on a hand-held mic. Up to 18 decibels of plosives can be quickly removed using SPECTRAL INTERPOLATION and REPAIR FILTER with no audible artifacts.



Original audio with popped p's

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Restored audio with plosives removed

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Spectral Interpolation

Spectral Interpolation is used for removing unwanted sounds that are deeply embedded in critical dialogue, music or ambience.  For example if a cell phone beeps during a take, or if a chair squeaks during a recital the sound can be quickly reduced or removed. Waveforms are repaired by using existing temporal and spectral information.

 


Remove Distortion Effects

 

Example: Orchestra with Distortion

This recording has severe analog clipping in the second half of clip. After restoration the harsh crackling is gone and the original ambience of the hall is preserved. Tape hiss was reduced, but not entirely removed, so as to indicate the characteristics of the original recording format.



Original audio with distortion, hiss and crackles

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Restored audio after removing distortion, hiss and crackles

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Location


  • 1300 Soldiers Field Road, #7
    Boston, MA 02135

Hours


Mon-Fri 9am-5:30pm
Weekend closed

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