Sound Design Audio Effects and Signal Processing 2 — Questions and Answers
Question 1: What is a 'limiter' in audio signal processing?
- A compressor with an extremely high ratio (typically 10:1 or more) that prevents the signal from exceeding the threshold (Correct answer)
- A type of filter that limits frequencies
- A device that limits recording length
- A noise gate with a fixed threshold
Correct answer: A compressor with an extremely high ratio (typically 10:1 or more) that prevents the signal from exceeding the threshold
A limiter is essentially a compressor with a very high ratio (often infinity:1) that acts as a ceiling, ensuring the output signal never exceeds the threshold level — used for broadcast loudness compliance and mastering.
Question 2: What does a 'noise gate' do?
- Adds noise to a signal
- Attenuates or mutes a signal when it falls below a set threshold level (Correct answer)
- Compresses the signal when it gets too loud
- Applies noise reduction to a recording
Correct answer: Attenuates or mutes a signal when it falls below a set threshold level
A noise gate silences or attenuates a signal when its level falls below a defined threshold, effectively removing low-level noise (hum, hiss, bleed) during pauses while allowing intentional signal through when it's loud enough.
Question 3: What is 'saturation' as an audio effect?
- Adding high-frequency air to a signal
- Introducing harmonic distortion that emulates the warm clipping characteristics of analog tape or tube electronics (Correct answer)
- A type of stereo widening effect
- Applying heavy compression to a signal
Correct answer: Introducing harmonic distortion that emulates the warm clipping characteristics of analog tape or tube electronics
Saturation adds harmonic distortion by emulating the soft-clipping behavior of analog tape, tube amplifiers, or transistors, adding warmth, presence, and character without the harshness of digital clipping.
Question 4: What is the 'mix' or 'wet/dry' knob on an effects processor?
- Controls the master volume of the plugin
- Blends between the unprocessed (dry) original signal and the fully processed (wet) signal (Correct answer)
- Sets the effect's internal tempo
- Adjusts the filter cutoff
Correct answer: Blends between the unprocessed (dry) original signal and the fully processed (wet) signal
The wet/dry (mix) control sets the balance between the unprocessed dry signal and the effect-processed wet signal, allowing precise blending — 100% wet means only processed signal, 0% means only original.
Question 5: What does a 'phaser' effect do to audio?
- Splits the signal into multiple bands
- Applies all-pass filters to create peaks and notches that sweep across the frequency spectrum, creating a swirling sound (Correct answer)
- Delays the signal by a fixed number of samples
- Applies heavy saturation
Correct answer: Applies all-pass filters to create peaks and notches that sweep across the frequency spectrum, creating a swirling sound
A phaser uses all-pass filters to create peaks and notches in the frequency response that sweep up and down the spectrum based on an LFO, creating a distinctive whooshing or swirling modulation effect.
Question 6: What is 'parallel compression' (also called New York compression)?
- Applying the same compressor settings to two tracks
- Blending a heavily compressed copy of a signal with the original uncompressed signal (Correct answer)
- Compressing left and right channels separately
- Using two compressors in series
Correct answer: Blending a heavily compressed copy of a signal with the original uncompressed signal
Parallel compression blends a heavily compressed version of the signal with the dry original, preserving natural transients and dynamics from the dry signal while adding the density and sustain of the compressed copy.
Sound Design Audio Effects and Signal Processing 2
What is a 'limiter' in audio signal processing?