In electronics

Electronics

Electronics is the branch of science, engineering and technology that deals with electrical circuits involving active electrical components such as vacuum tubes, transistors, diodes and integrated circuits, and associated passive interconnection technologies...

 (radio

Radio

Radio is the transmission of signals through free space by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space...

 in particular), a spurious tone (also known as an interfering tone, a continuous tone or a spur) denotes a tone in an electronic circuit

Electronic circuit

An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces through which electric current can flow...

 which interferes with a signal and is often masked underneath that signal. Spurious tones are any tones other than a fundamental tone or its harmonics. They also include tones generated within the back-to-back connected transmit and receive terminal or channel units

Channel service unit

In telecommunications, a channel service unit is a line bridging device for use with T-carrier that:*is used to perform loopback testing,*may perform bit stuffing,*may also provide a framing and formatting pattern compatible with the network,...

, when the fundamental is applied to the transmit terminal or channel-unit input.

External links

• http://www.tm.agilent.com/data/static/eng/tmo/demo/hp8594Q/tone.htm