What is the definition of detection in a radio receiver?

Detection in a radio receiver refers to the process of extracting the original information or intelligence from a modulated radio frequency (RF) signal. When an RF signal is transmitted, it carries information such as voice, music, or data, which is typically modulated onto the carrier wave. Detection is the step in the receiver that demodulates this signal, recovering the original audio or data that was sent. This process allows the receiver to convert the RF signal back into a format that can be understood, such as sound through speakers.

The other options discuss important aspects of radio communication but do not define detection accurately. For example, amplification pertains to increasing signal strength rather than recovering information. Conversion of audio to RF signals involves transmission rather than reception and is critical in the modulation process itself. Finally, eliminating noise is a separate function aimed at improving signal clarity but does not encompass the complete process of detection, which specifically focuses on recovering the intended message from a modulated signal.