Modulated Spurious Signal

What Does Modulated Spurious Signal Mean?

A modulated spurious signal is a carrier signal that emanates from an information processing device and can be intercepted. It is a type of compromised signal referred to in Telecommunications Electronics Material Protected from Emanating Spurious Transmissions (TEMPEST), which refers to the investigation and testing of compromising signals. These signals are generated from the modulation of carrier signals and the electromagnetic field that can be created around them.

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Techopedia Explains Modulated Spurious Signal

Modulated spurious signals are primarily created when a carrier signal is modulated. The carrier can be in the form of a parasitic oscillation generated within information processing equipment and the modulation can be in the form of angle modulation or amplitude modulation. The introduction of modulated data signals creates a spurious signal to modulate, and the result is emitted into the air or merged into the external conductors of the underlying equipment.

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Margaret Rouse
Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.