Tips for Removing Clicks From Field Recordings in Outdoor Environments

Field recordings captured in outdoor environments can be invaluable for various projects, from wildlife documentaries and nature soundscapes to environmental research and film location audio. However, these recordings often contain unwanted clicks, pops, and other transient artifacts that can detract from the audio quality and ruin an otherwise perfect take. Fortunately, with a combination of careful field technique and precise digital editing, you can remove most clicks and restore the natural clarity of your recordings.

Understanding the Source of Clicks

Clicks in outdoor recordings typically originate from a handful of common sources. Identifying the cause helps you choose the most effective cleaning strategy and, more importantly, prevent clicks from happening in the first place.

Microphone handling noise: Even slight bumps to the microphone body or cable transmit low-frequency thumps and sharp clicks. Use shock mounts and boom poles with good isolation.
Faulty cables or connectors: A loose XLR connection, a bent pin, or a deteriorating cable shield can produce intermittent crackling or static clicks. Always inspect cables before recording and carry spares.
Preamplifier or recorder issues: Digital clipping, buffer underruns, or power surges can introduce sharp clicks. Monitor levels carefully and avoid overloading inputs.

Environmental Clicks

Insect activity: Crickets, cicadas, or beetles crawling across the microphone’s diaphragm create abrupt percussive sounds that mimic digital clicks.
Wind and debris: Gusts of wind can cause the diaphragm to slam against its limits, producing low-frequency pops or high-frequency clicks. Leaves, twigs, or raindrops striking the mic also cause sharp transients.
Animal movement: Birds landing on a microphone mount or small mammals brushing against cables introduce short bursts of noise.

User-Induced Clicks

Breath pops and mouth noises: Not exclusive to outdoor recording, but wind here can exaggerate plosives. Use a proper windscreen and maintain distance from the mic.
Footsteps and gear rustle: The sound of your own movement, especially when wearing headphones, can introduce clicks through the mic stand or boom.

Pre-Processing Tips: Capture Clean Audio from the Start

Every click you prevent in the field is one you don’t have to remove in post. Implement these practices to minimize artifacts before they reach the waveform.

Use high-quality gear: Invest in microphones with low self-noise and robust construction. Use premium shielded cables from brands like Canare or Mogami to reduce EMI pickup. A good shock mount (e.g., Rycote or Rode) isolates handling noise.
Record at appropriate levels: Set your gain so that peaks stay around -6 dBFS to -12 dBFS. This leaves headroom for sudden sounds and avoids digital clipping, which produces permanent click-like distortion.
Apply windshields and filters: Use a combination of foam windscreens and fur blimps for outdoor conditions. A high-pass filter on your recorder (if available) can roll off subsonic wind rumble before it saturates the preamp.
Choose recording times and locations wisely: Record during calm weather. Avoid areas with heavy insect populations if possible, or use a directional microphone to reduce incidental sounds.
Always monitor with headphones: Close‑back headphones help you hear subtle clicks that meters might miss. Pause and reposition if you hear transient noise.
Record room or ambient tone: Capture at least 30 seconds of pure environment noise. This “noise print” is invaluable for later noise reduction algorithms that target constant background hiss without affecting transient clicks.

Digital Techniques for Removing Clicks

Once you’ve done your best in the field, digital audio workstations (DAWs) and specialized software provide powerful tools for click removal. The method you choose depends on the severity and type of click.

Using Automatic Click Removal Plugins

Most professional audio editors and many consumer‑level programs include dedicated click removers. These tools analyze the waveform and automatically suppress short transients that exceed a defined threshold.

Audacity: The built-in Click Removal effect lets you set parameters like threshold and spike width. It works well for isolated clicks but can dull high‑frequency content if used aggressively.
Learn more in the Audacity Click Removal documentation.
Adobe Audition: The DeClicker (part of the Repair suite) offers presets for “Crackle,” “Pops,” and “Clicks.” You can adjust sensitivity and frequency range, and preview the removed audio to avoid over‑processing.
iZotope RX: An industry standard for audio restoration. The Spectral De‑click module uses machine learning to identify and repair clicks with minimal artifacts. You can isolate the click in the spectrogram and replace it with interpolated data. See the iZotope guide to Spectral De‑click.

Best practice: Apply automatic removal in a gentle pass first—aggressive settings can create audible distortion. Then review the waveform and listen for residual clicks to handle manually.

Manual Editing for Precise Control

When automatic tools miss a click or harm desired audio, manual intervention gives you complete control. This is especially valuable for delicate nature recordings where transients like bird calls or water drips must remain intact.

Zoom into the waveform: Identify the click as a vertical spike—often narrow (1–10 ms). Audition the region to confirm it’s an artifact.
Use a selection tool: Highlight just the click (or a few samples before and after). Apply a short fade‑in and fade‑out (0.5–2 ms) to soften the transient.
Replace with interpolation: In DAWs like Logic Pro or Ableton Live, the “repair” or “heal” function replaces the selected segment with surrounding audio using crossfade interpolation. This is far less destructive than mute.
Spectral editing: Use a spectrogram view (e.g., in Audition or RX) to see clicks as vertical streaks. The pencil tool can paint over them; RX’s spectral repair reconstructs the area based on neighboring frequencies. This preserves the natural texture of wind or water while removing clicks.

Noise Reduction and Spectral Layer Separation

Clicks often coexist with constant background noise (wind rumble, traffic hum, etc.). A dual approach yields the best result.

Noise print reduction: Using the ambient tone you recorded, create a noise profile in your DAW. Apply noise reduction to lower the noise floor. Avoid over‑processing, which can introduce metallic artifacts.
Notch filtering: If clicks have a consistent frequency (e.g., a 50 Hz hum from a distant generator), use a narrow notch filter. However, clicks are broadband, so notch filtering alone is insufficient—use it as a complement.
Gate and expander: A noise gate can mute silent passages between sounds, but it won’t remove clicks that occur during active audio. An expander can gently reduce background noise without chopping off tails.

For an in‑depth comparison of restoration tools, read Sound On Sound’s article on click and pop removal.

Building a Post-Production Workflow

To keep your field recordings pristine, follow a systematic workflow. This reduces processing artifacts and saves time.

Listen and mark: Play through the entire recording and place markers at each click or pop. Note the time and severity.
Apply a gentle automatic pass: Run a click removal plugin with conservative settings (e.g., threshold just above the noise floor). Listen to the result and make notes of missed clicks or over‑processing.
Manual repair: Address remaining clicks individually. Use spectral editing for complex backgrounds like rustling leaves or running water. Zoom in and interpolate; avoid hard cuts.
Noise reduction: Apply noise reduction using your ambient tone profile. Keep reduction to 6–12 dB to preserve natural dynamics.
Final listening pass: Play the entire file at different volumes (including soft) and on multiple playback systems (headphones, speakers) to catch subtle artifacts the first pass missed.

Tools Comparison Table

Tool	Best For	Limitations
Audacity Click Removal	Quick batch processing of simple clicks	Can dull high‑frequency content
Adobe Audition DeClicker	Moderate click removal with presets	Not as precise as RX for complex environments
iZotope RX Spectral De‑click	Difficult clicks in continuous audio (e.g., wind, water)	Paid software; learning curve
Manual interpolation	Isolated clicks in clean recordings	Time‑consuming for many clicks

Common Mistakes and How to Avoid Them

Over‑processing: Applying too much click removal can smear transients, making audio sound synthetic. Always use the minimum effective amount.
Failing to preserve transients: Bird calls, footsteps, and water splashes are themselves sharp transients. Over‑aggressive removal kills them. Use spectral editing to differentiate artifact clicks from natural sounds.
Ignoring the root cause: If you keep removing clicks from every recording, improve your field technique. Check connectors, shock mounts, and wind protection before your next session.
Neglecting backups: Always keep an unprocessed copy of the original recording. If you make a mistake in restoration, you can return to scratch.

Advanced Techniques for Challenging Environments

Field sound recordists often face extreme conditions that generate multiple click types simultaneously. Here are advanced strategies:

Spectral Repair for Wind Noise Clicks

Wind rumble often contains both low‑frequency surges and high‑frequency crackles. Use spectral repair with the “attenuate” mode set to target only the click‑like artifacts, leaving the low‑end rumble intact until you apply a gentle high‑pass filter later.

Multi‑Band Processing

Different frequencies can be processed independently. For example, use a click remover only on frequencies above 500 Hz (where most clicks live) while leaving low frequencies alone. Many DAWs allow multiband dynamics processing, or you can duplicate the track, filter, and process separately, then mix.

De‑reverberation and Click Removal

Reverberant environments (e.g., canyons, forests) can smear clicks into longer artifacts. Use a dedicated de‑reverb plugin before click removal, or work in the spectral domain where the click’s time‑frequency signature stands out from the reverb tail.

For a deeper dive, the book Audio Restoration: A Historical and Practical Guide by John L. S. O. (available through online booksellers) provides comprehensive theory and hands‑on methods.

Conclusion

By combining careful field techniques—like using quality gear, proper levels, and effective windscreens—with a disciplined post‑production workflow that includes automatic click removal, manual editing, and spectral repair, you can achieve clean, professional outdoor recordings. Each click you remove brings the listener closer to the natural sound you intended to capture. The key is to understand the source, choose the right tool for each artifact, and always preserve the life and texture of the original environment.