Using electrical technology, it is possible for us to synthesise new sounds.
Types of Generated Sound
Electrical devices produce three main types of generated sound.
1. Pitched Tones
Steady (PitchThe relative height of a sound, ranging from low to high.pitched) signals are produced by electrical components, called oscillators. These sounds have a clear pitch and duration.
A generated sound with a clear pitch.
Different types of oscillators produce different types of pitched sounds. These are explored in Basic Soundwaves.
2. Noise Sounds
Noise sounds are the opposite of pitched tones, they have no steady waveform and are highly randomised. Their sounds are spread across the spectrum.
This is a clip of white noise. It is very intense because the whole frequency range (from very low to very high) is saturated.
3. Impulse Clicks
Very short sounds which make a click sound. Their EnvelopeThe shape of a sound over time.envelope will dictate how sharp or smooth they sound, but they often sound like noisy clicks.
A very short generated sound.
Controlling the New Sounds
By changing the input controls on an oscillator, it is possible to change the pitch (frequency) and amplitude (loudness) of these sounds. Individual waves can be added together to create more complex waveforms.
The three sound types of PitchThe relative height of a sound, ranging from low to high.pitched tones, NoiseA term that describes sounds that have a diffuse spread of spectral energy. It is often contrasted with pitched sounds.noise sounds, and impulse clicks can be thought of as extreme types of generated sound. Many other sounds exist between these extreme points as a mixture of all three sound types.
The Elektronische Musik (Electronic Music), created in the Cologne studios, used mainly electronically produced sounds.
Some manipulations also use these type of waves as a signal to control the parameters of an effect over time (for example: a Low Frequency Oscillator).