Overmodulation results in spurious emissions by the modulated carrier, and distortion of the recovered modulating signal.

The use of such equipment must still satisfy national and international standards on spurious emissions.

A computer is a typical example, where spurious emissions may not be contained within the case.

In modern equipment there are three main types of spurious emissions.

The term spurious emissions refers to any signal which comes out of a transmitter other than the wanted signal.

As with all out-of-band noise, these spurious emissions can interfere with receivers.

Phase noise, spurious emission, and jitter are results of the above phenomena.

A spurious emission is any radio frequency not deliberately created or transmitted, especially in a device which normally does create other frequencies.

A harmonic or other signal outside a transmitter's assigned channel would be considered a spurious emission.

They may even come in sets, to filter out various spurious emissions.