Oscillator

1. Electronic An electronic oscillator is an electronic circuit that is capable of creating a repetitive waveform. The most common is a sine wave, but sawtooth, step, square, and triangular waveform oscillators are commonly available. The oscillator circuits are sometimes contained within a device called a signal generator. The signal generator is a box with a variable frequency dial, a waveform selector an attenuator, and a least one pair of output plugs. See diagram on the right.

In musical sound synthesis, oscillators conventionally form the most fundamental synthesis building block. With analog synthesizers, they are realized as electronic oscillators and with digital or software synthesizers they are generated algorithmically. Modern software synthesis environments such as CSound have generalized the oscillator as a type of unit generator (UG), where UGs are primitive modules that produce, modify or acquire audio or control signals.

2. Mechanical

A reciprocating or vibrating mechanical device like a piston or a tuning fork are both mechnical oscillators.

3. Mathematical

The mathematical description of an oscillator involves a description of a continuous function that varies periodically above and below a mean or other reference, extending from -infinity to +infinity, never fading, never diverging. This can be represented as a sequence:

For example the sequence 1, -1, 1, -1, 1, -1,... is an oscillation that is analogous to a square-wave generator. [This paragraph is horribly written; a mathematician who knows the conventions of this area could correct it. I have changed the incorrect word "series" to "sequence".]

See also:

• harmonic oscillator
• simple harmonic motion
• differential equation