Sonnox DeBuzzer Restoration Plug-in (Native)

The Sonnox DeBuzzer Restoration Plug-in Native, remove buzz and hum from your recorded audio.

Sonnox DeBuzzer Restoration Plug-in Native Details

The Oxford DeBuzzer is divided into two stages: Detection and Removal.

Buzz removal is usually accomplished using a comb filter. The comb filter has many tight notches that eliminate the fundamental frequency and associated harmonics of the buzz. For this process to work well, the fundamental frequency must be very accurately determined.

The DeBuzzer has several ways of helping isolate the fundamental frequency.

First is the Peak Profile that is displayed above the central rotary control, which shows the strength of a given nominal frequency in the input signal. Second is the large FFT display which accentuates any frequency components that are consistently present, making them stand out in the plot. It will automatically mark the three highest peaks found, and you can set the nominal frequency by clicking one of the peaks on the graph.

The third method of isolating the fundamental frequency is a tone generator. In the same way as you can tune a guitar, as you home into the fundamental, the beat frequency between the tone and the fundamental will become slower and slower the closer you get.

Three Tracking Modes

The DeBuzzer has three modes, Fast, Auto and Freeze. By default the plug-in assumes Auto mode, continuously hunting either side of the nominal frequency for a peak profile. Once the lock strength rises to be above a certain level, the plug-in automatically sets the nominal frequency to the frequency of the peak found. If the hum is wandering in frequency, the detector will follow. Auto Mode is suitable for tracking a weak, slowly wandering fundamental and operates over all three frequency bands. Fast tracking mode allows the removal filters to automatically follow a quickly wandering fundamental.

In Auto Mode the nominal frequency is set with the large central rotary to within about 5Hz of a 50Hz or 60Hz hum frequency, the plug-in will automatically move towards the detected frequency and set itself up to remove it. Once the hum has disappeared, Freeze mode can be selected to set the nominal to this exact frequency and stop the detector from hunting.

The large central rotary control can be setup to control three frequency ranges, determined by the LF, MF and HF buttons, and can be set with a very fine resolution of 1/10,000Hz

For removing whines and whistles it is best to set Freeze Mode, and then use the FFT to find the frequency of the whines. These show up as peaks on the plot, and then you can click on a peak to set up the plug-in to remove that frequency.

Filter Choice

In terms of the removal filters, the default is a comb filter. However, you can override this by selecting Para-EQ mode, which means using parametric EQ sections to remove the fundamental and harmonics. If the buzz contains many harmonics, or if the frequency of the buzz is wandering, it is best to use the Comb filter. If there are only one or two harmonics to remove, then you may find that you prefer the sound of the parametric EQ filters.

In Para-EQ mode you can reduce attenuation as you increase in frequency, with the Slope control, and you can choose to notch out odd and even harmonics, as opposed to only odd harmonics.

Output

The listen section of the Output Panel contains an option to listen to the difference between the input and the processed output. This is labeled 'Diff' and is particularly useful for hearing what has been repaired, and for listening to the quality of the repairs without being distracted by the audio material.

Sonnox DeBuzzer Restoration Plug-in Native Features

• High performance hum and buzz removal using advanced algorithms
• Separate Detect and Remove Sections for intuitive workflow
• Scalable high resolution FFT of input signal shows strongest harmonics and removal filter
• Very accurate setting of fundamental over 3 frequency ranges
• Integrating frequency display shows strength of fundamental
• Tracking mode can be set to Automatic or Fast to follow fundamentals that wander in frequency, or to Freeze for fundamentals that vary in amplitude
• Choice of removal filters: Comb for general purpose narrow removal over many harmonics, or Parametric EQ for a more musical removal over a small set of harmonics
• Two audition modes, including option to listen to the removed buzz

Sonnox DeBuzzer Restoration Plug-in Native Specifications

• Sample Rates Supported:
  • 44.1Khz
  • 48kHz
  • 88.2kHz
  • 96kHz
• Sample delay (latency) in Pro Tools RTAS
  • 44.1 / 48 kHz: 7041
  • 88.2 / 96 kHz: 14337
• Sample delay (latency) as VST
  • 44.1 / 48 kHz: 6145
  • 88.2 / 96 kHz: 12289
• Fundamental Frequency Ranges:
  • 20 to 160 Hz
  • 160 to 1280 Hz
  • 1280 to 20kHz
• Width of the Frequency Detect window:
  • Narrow - LF: 3% MF: 2% HF: 0.5%
  • Normal - LF: 12% MF: 8% HF: 1.5%
  • Wide - LF: 20% MF: 12% HF: 2%
• Resolution of Frequency Adjustment:
  • Normal: 1.0 Hz
  • Fine: 0.01 Hz
  • Shift-fine: 0.0001 Hz
• Bandwidth Range: 75 Hz to 20kHz
• Sharp/Q: 16 to 160
• Attenuation: 0dB to -144dB
• Tone: -96dB to -6dB
• Input trim: -12dB to +12dB
• Output trim: -12dB to 0dB

Sonnox DeBuzzer Restoration Plug-in Native System Requirements

• Pro Tools
  • Pro Tools 7, 8, 9, 10, & 11
  • Approved Pro Tools CPU, OS and hardware configuration
  • Mac OSX 10.4
  • Windows XP / Vista / Windows 7 / Windows 8
  • RAM 1GB minimum
  • iLok key with latest drivers
  • iLok 2 required for AAX plug-ins
• Audio Units
  • Audio Units compatible application (Logic, Digital Performer etc.)
  • Mac OSX 10.4 or later
  • RAM 1GB minimum
  • iLok key with latest drivers
  • iLok 2 required for 64-bit plug-ins
• VST
  • VST compatible application (Cubase, Nuendo, Acid etc.)
  • Mac OSX 10.4 or later
  • Windows XP / Vista / Windows 7 / Windows 8
  • RAM 1GB minimum
  • iLok key with latest drivers
  • iLok 2 required for 64-bit plug-ins