superheterodyne receiver
Noun: A superheterodyne receiver is a type of radio receiver that converts incoming radio frequency (RF) signals to a fixed, lower intermediate frequency (IF) by combining them with a signal from a local oscillator. This intermediate frequency signal is then amplified and demodulated to extract the audio or data information. This design greatly improves selectivity and sensitivity compared to earlier receiver types.
The term is used specifically in the context of electronics, radio engineering, and communications technology to describe a fundamental and common circuit architecture.
Examples: * Most modern AM and FM radios are built using a superheterodyne receiver circuit. * The invention of the superheterodyne receiver was a major advancement in radio technology. * To improve signal clarity, the engineer chose a superheterodyne receiver design for the new device.
- The principle is so dominant that it is often shortened informally to "superhet."
- The process of frequency conversion at the heart of this receiver is called "heterodyning."
- Superhet (n.): A common abbreviation for "superheterodyne receiver."
- Heterodyne (v., adj.): Referring to the technique of combining two frequencies to produce new ones (sum and difference). This is the core principle of the superheterodyne receiver.
- Intermediate Frequency (IF) (n.): The fixed, lower frequency to which the incoming signal is converted inside a superheterodyne receiver.
- Local Oscillator (LO) (n.): The internal circuit in a superheterodyne receiver that generates the signal mixed with the incoming signal.
- Superhet (abbreviation)
- Heterodyne receiver
- Tuned Radio Frequency (TRF) receiver: An older, simpler design that amplifies the incoming radio signal directly without converting it to an intermediate frequency.
- Direct-conversion receiver: A receiver that converts the incoming signal directly to baseband audio or data frequencies in a single step.
- Image frequency: An unwanted input frequency that can interfere with the desired signal in a superheterodyne receiver, a problem that must be filtered out.
- IF amplifier: The stage in a superheterodyne receiver that provides most of the gain and selectivity at the fixed intermediate frequency.
- Mixer: The component in a superheterodyne receiver that combines the incoming RF signal with the local oscillator signal to produce the intermediate frequency.
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a radio receiver that combines a locally generated frequency with the carrier frequency to produce a supersonic signal that is demodulated and amplified
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