Sound Design Fundamentals Flashcards

Question 1

What is a sound wave in simple physical terms?

Accepted Answer

A sound wave is a disturbance that travels through a medium such as air, water, or solid material by making particles vibrate back and forth. Energy moves through the medium, but the particles mostly stay near their resting positions. Sound cannot travel through a vacuum because there are no particles to carry the vibration.

Question 2

How does frequency relate to the pitch we perceive?

Accepted Answer

Frequency is the number of complete vibration cycles a wave completes each second, measured in hertz. Higher frequencies generally produce higher perceived pitches, while lower frequencies produce lower pitches. Pitch is the listener's perception, so it also depends on factors such as loudness and the specific waveform.

Question 3

What does amplitude control in a sound, and how is it heard?

Accepted Answer

Amplitude is the size of a wave's displacement from its resting position, and it largely determines perceived loudness. Larger amplitude means more energy in the wave and a louder sound, while smaller amplitude produces a quieter one. Amplitude does not change pitch, which is governed by frequency rather than size.

Question 4

Why do sound designers care about the harmonic content of a tone?

Accepted Answer

Harmonic content refers to the set of overtones, integer multiples of a fundamental frequency, that sit above the fundamental. The balance among these partials determines timbre, the quality that lets listeners tell a violin from a flute playing the same note. Designers shape harmonics to make sounds brighter, darker, buzzier, or hollower.

Question 5

What is the difference between a sine wave and a square wave?

Accepted Answer

A sine wave contains only one frequency, the fundamental, and sounds smooth and pure with no overtones. A square wave alternates sharply between two levels and contains odd-numbered harmonics, which gives it a hollow, buzzy character. The difference comes entirely from harmonic content, even when both waves share the same pitch.

Question 6

How do sound designers use the decibel scale when balancing levels?

Accepted Answer

The decibel is a logarithmic unit that compares a sound level to a reference, so equal decibel steps represent equal ratios of intensity rather than equal added amounts. Because hearing responds roughly logarithmically, decibels track perceived loudness better than raw intensity. Designers use meters and faders to set relative levels.

Question 7

What is the Doppler effect, and why does it matter in sound design?

Accepted Answer

The Doppler effect is the apparent change in frequency that occurs when a sound source and listener move relative to each other. A passing siren sounds higher as it approaches and lower as it recedes. Designers simulate this shift to convey motion, speed, and distance in vehicles, projectiles, and moving characters.

Question 8

What is the difference between a transient and a sustained sound?

Accepted Answer

A transient is a brief, sudden burst of energy at the start of a sound, like a drum hit. A sustained portion holds steady energy over time, like a held note or a hum. Designers treat these parts separately because controlling attack and body independently allows precise shaping.

Question 9

What is an oscillator, and why is it the starting point of most synthesized sounds?

Accepted Answer

An oscillator is a circuit or software module that generates a repeating waveform at a set frequency, such as sine, sawtooth, square, or triangle. Nearly every synth patch begins with one or more oscillators, because their waveform sets the harmonic raw material that later stages shape.

Question 10

How does subtractive synthesis create a sound from a waveform?

Accepted Answer

Subtractive synthesis starts with a harmonically rich waveform, usually a sawtooth or square, and removes frequencies with a filter. Lowering the cutoff reduces brightness, while resonance emphasizes frequencies near the cutoff. Filter motion over time is a central technique for giving synth sounds movement and character.

Question 11

What is additive synthesis, and how does it build a tone?

Accepted Answer

Additive synthesis builds a tone by summing many sine waves, each at its own frequency and amplitude, typically harmonics of a fundamental. Because every partial is controlled separately, the designer can shape the timbre precisely and animate individual harmonics over time. The method is computationally demanding but offers fine control over complex textures.

Question 12

What is frequency modulation synthesis, and what kind of sounds does it produce?

Accepted Answer

Frequency modulation synthesis uses one oscillator, the modulator, to rapidly change the frequency of another, the carrier. The result is a set of sidebands that can produce bright, metallic, bell-like, or glassy tones. Small modulation amounts give subtle richness, while larger amounts create dense, inharmonic spectra.

Question 13

What is wavetable synthesis, and how does it differ from basic oscillators?

Accepted Answer

Wavetable synthesis stores a sequence of single-cycle waveforms and scans through them over time, morphing the timbre as the position changes. A basic oscillator usually keeps one fixed waveshape, while a wavetable oscillator can move through many shapes during a note. This makes it well suited to evolving pads, growls, and animated textures.

Question 14

What is granular synthesis, and how does it work?

Accepted Answer

Granular synthesis breaks a recorded or generated sound into many tiny fragments called grains, often only tens of milliseconds long. Grains are played back overlapping, and changes in their position, pitch, density, and envelope produce textures unlike the original sound source.

Question 15

What is physical modeling synthesis, and how does it simulate instruments?

Accepted Answer

Physical modeling synthesis calculates sound by simulating the physics of a real or imagined instrument, such as a string, air column, or resonating body. The designer sets parameters that resemble materials, excitation, and damping, and the algorithm produces the resulting vibrations. This often gives natural responses to playing gestures.

Question 16

Why do sound designers often layer several synthesis methods in one patch?

Accepted Answer

Layering combines the strengths of different techniques, so one source can supply a bright attack, another a rich body, and a third a textured tail. Each layer can be processed separately with its own envelope, filter, and effects before mixing. This approach gives control over complexity that a single engine often cannot match.

Question 17

What is an ADSR envelope, and what does each stage control?

Accepted Answer

An ADSR envelope shapes a sound's level using four stages: attack, decay, sustain, and release. Attack sets how quickly the sound rises to level, decay sets how fast it drops to the sustain level, sustain is the held level while a key stays pressed, and release controls the fade after the key is lifted.

Question 18

How does a low-pass filter change a sound?

Accepted Answer

A low-pass filter allows frequencies below a chosen cutoff point to pass while attenuating frequencies above it. The result is a darker, warmer, or muffled sound, depending on the cutoff setting. Moving the cutoff over time is one of the most common ways to add movement.

Question 19

What is the role of resonance in a filter?

Accepted Answer

Resonance, sometimes called emphasis or Q, boosts frequencies near the filter's cutoff point. Low resonance leaves the filter gentle, while high resonance creates a pronounced peak that can ring or whistle. Designers use this peak to add vocal, nasal, or synthetic character to a sound.

Question 20

What is a low-frequency oscillator (LFO), and how is it used?

Accepted Answer

A low-frequency oscillator, or LFO, generates a slow repeating wave that is too low to hear as pitch and instead modulates other parameters. Common targets include pitch for vibrato, amplitude for tremolo, and filter cutoff for pulsing or wah-like motion. Designers sync LFOs to tempo so movement locks to the beat.

Question 21

What is the difference between an LFO and an envelope?

Accepted Answer

An envelope plays through once per note, shaping a sound from its start to its end, while an LFO repeats continuously, creating cycles of change. Envelopes respond to note events, so each note repeats the same shape. LFOs run independently of notes unless they are retriggered, making them better suited to ongoing motion.

Question 22

What does velocity mean in synthesis, and what can it control?

Accepted Answer

Velocity describes how forcefully a note is played, as measured by a keyboard or other controller. Synths can route velocity to amplitude, filter cutoff, or envelope timing, so harder playing produces louder, brighter, or more aggressive sounds. Designers use this mapping to make instruments respond expressively.

Question 23

What is modulation routing, and why do designers use it?

Accepted Answer

Modulation routing connects a source, such as an LFO, envelope, or velocity, to a destination parameter, such as pitch, filter cutoff, or level. A matrix lets designers assign many sources to many destinations and set how strongly each one acts. This makes complex, interlocking movement practical to program.

Question 24

What is keyboard tracking, and why does it matter for filter cutoff?

Accepted Answer

Keyboard tracking makes the filter cutoff move with the pitch of the note played, so higher notes open the filter further. Without tracking, a bright sawtooth may sound harsh in the upper register and muddy in the lower one. Tracking keeps the tonal balance consistent across the keyboard.

Question 25

What is the difference between a dynamic and a condenser microphone?

Accepted Answer

A dynamic microphone uses a moving coil or ribbon within a magnetic field, is sturdy, and handles high sound levels well. A condenser microphone uses a charged diaphragm near a backplate, needs power, usually called phantom power, and captures detail and transients with greater sensitivity.

Question 26

What do polar patterns describe in a microphone, and why do they matter?

Accepted Answer

A polar pattern describes how sensitive a microphone is to sound arriving from different directions. Cardioid patterns favor the front and reject much of the rear, which helps isolate a source. Omnidirectional patterns pick up sound fairly evenly from all sides, while figure-eight patterns capture front and back but reject the sides.

Question 27

What is the proximity effect, and how does it affect close miking?

Accepted Answer

The proximity effect is a boost in low frequencies that some directional microphones produce when a sound source is very close to the capsule. It can add warmth and fullness to vocals or instruments, but too much can make a sound muddy or boomy. Engineers manage it by adjusting distance or angle.

Question 28

Why does microphone placement matter so much in recording?

Accepted Answer

Placement determines which parts of a sound source are captured and how the room contributes to the recording. Moving a microphone closer or farther changes the balance between direct sound and reflections, while aiming it at different parts of an instrument changes tone. Careful placement often reduces the need for heavy processing later.

Question 29

What is the three-to-one rule for spaced stereo microphones?

Accepted Answer

The three-to-one rule suggests that the distance between two spaced microphones should be about three times the distance from the pair to the sound source. This spacing helps limit phase problems in the mix. It is a practical guideline rather than a strict law and engineers adjust it by ear.

Question 30

What is the difference between sample rate and bit depth?

Accepted Answer

Sample rate is how many times per second a digital recording measures the incoming signal, which determines the highest frequency that can be captured. Bit depth sets how finely each measurement is resolved, which affects dynamic range and noise. Both settings are chosen when recording, and higher values increase file size and processing demands.

Question 31

What is room tone, and why do engineers record it?

Accepted Answer

Room tone is the quiet, continuous sound of a space when no intentional sound is playing, including air handling, distant traffic, and the room's own character. Engineers record a few seconds of it so they can fill gaps during editing, smooth out abrupt silences, and keep background noise consistent between takes.

Question 32

Why is gain staging important before recording a session?

Accepted Answer

Gain staging means setting input levels so the signal is strong enough to stand above electrical noise but never so high that it clips. Recording too quietly raises the noise floor relative to the sound, while recording too loudly causes harsh digital distortion that cannot be repaired. It also leaves headroom for louder moments.

Question 33

What is panning, and how does it place a sound in the stereo field?

Accepted Answer

Panning distributes a signal between the left and right channels, creating the perception that the sound sits at a particular position across the stereo image. Center placement sends equal energy to both sides, while hard pans send the sound to one side only. Designers use panning to separate instruments and create width.

Question 34

What does equalization do to a sound's frequency balance?

Accepted Answer

Equalization, or EQ, boosts or cuts the level of specific frequency ranges to change a sound's tonal balance. A high-pass filter removes low rumble, a gentle boost around the upper midrange can add presence, and a cut in a crowded range can clear space for other instruments.

Question 35

What does a compressor do, and what are its main controls?

Accepted Answer

A compressor reduces the level of sounds that exceed a set threshold, narrowing the gap between quiet and loud passages. Its main controls include threshold, ratio, attack, and release, which determine when compression starts, how strongly it acts, and how quickly it engages and lets go.

Question 36

What is the basic difference between reverb and delay in sound design?

Accepted Answer

Delay repeats a sound as distinct echoes at set intervals, each one a discrete copy of the input. Reverb simulates the dense, decaying reflections of a space, so the echoes blur together into a continuous tail. Designers often combine both, using delay for rhythmic repeats and reverb for sense of room or atmosphere.

Question 37

Why do sound designers use pre-delay on a reverb?

Accepted Answer

Pre-delay sets a short gap between the dry sound and the start of the reverb. This gap helps the original sound stay clear and punchy, because the listener hears the source before the room reflections arrive. Longer pre-delay can also suggest a larger space.

Question 38

What is a send and return bus in a mix?

Accepted Answer

A send and return bus routes part of several tracks' signals to a shared effect, such as reverb, so the effect is applied once rather than separately to each track. Each track controls how much signal it sends, which lets the designer blend different amounts of the same space. This keeps the mix organized.

Question 39

How does stereo width relate to mono compatibility in a final mix?

Accepted Answer

Stereo width describes how spread out a mix feels between the speakers, often created with panning or stereo processing. Mono compatibility is the check that a mix still sounds balanced when its channels are summed to one speaker. Very wide elements can lose energy or cancel when summed, so designers check both views.

Question 40

Why do engineers check a mix at low listening levels?

Accepted Answer

Listening at low volume reveals whether important elements, such as dialogue, key melodies, or punchy low end, stay audible when playback is quiet. Human hearing changes with level, so a mix that sounds full when loud can feel thin or unbalanced when soft. Checking at several levels helps the mix translate across listening environments.

Sound Design Fundamentals Flashcards

1Sound Wave Fundamentals

2Synthesis Methods

3Envelopes, Filters, and Modulation

4Recording and Microphone Basics

5Mixing and Spatial Design

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