# English

## Noun

### Translations

- Swedish: vågform

Waveform means the shape and form of a
signal such as a wave
moving in a solid, liquid or gaseous medium.

In many cases the medium in which the wave is
being propagated does not permit a direct visual image of the form.
In these cases, the term 'waveform' refers to the shape of a graph
of the varying quantity against time or distance. An instrument
called an oscilloscope can be used to
pictorially represent the wave as a repeating image on a CRT or
LCD
screen.

By extension of the above, the term 'waveform' is
now also sometimes used to describe the shape of the graph of any
varying quantity against time.

# Examples of waveforms

Common periodic waveforms include- Sine wave: sin (2 π t). The amplitude of the waveform follows a trigonometric sine function with respect to time.
- Sawtooth wave: 2 (t − floor(t)) − 1. This looks like the teeth of a saw. Found often in time bases for display scanning. It is used as the starting point for subtractive synthesis, as a sawtooth wave of constant period contains odd and even harmonics that fall off at −6 dB/octave.
- Square wave: saw(x) − saw (x − duty). This waveform is commonly used to represent digital information. It is square wave of constant period contains odd harmonics that fall off at −6 dB/octave.
- Triangle wave: (t − 2 floor ((t + 1) /2)) (−1)floor ((t + 1) /2). This is the integral of the square wave. It contains odd harmonics that fall off at −12 dB/octave.

Other waveforms are often called composite
waveforms and can often be described as a combination of a number
of sinusoidal waves or other basis
functions added together.

The Fourier
series describes the decomposition of periodic waveforms, such
that any periodic waveform can be formed by the sum of a
fundamental component and harmonic components. Finite-energy
non-periodic waveforms can be analyzed into sinusoids by the
Fourier
transform.

# See also

- Sine wave
- Sawtooth wave
- Square wave
- Triangle wave
- Pulse wave
- WAV, an audio waveform file format
- Waveform monitor
- Waveform viewer

# References

# External links

- Waveform gallery of vocal sounds, including a stereo track

waveform in Arabic: شكل موجي

waveform in German: Signalverlauf

waveform in Modern Greek (1453-):
Κυματομορφή

waveform in Japanese: 波形

waveform in Norwegian: Bølgeform

waveform in Dutch: Golfvorm

waveform in Portuguese: Forma de onda

waveform in Swedish: Vågform