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Encyclopedia > Intermediate frequency

An intermediate frequency (IF) is a frequency to which a carrier frequency is shifted as an intermediate step in transmission or reception. It is the beat frequency between the signal and the local oscillator in a radio detection system. IF is also the name of a stage in a superheterodyne receiver. It is where an incoming signal is amplified before final detection is done. There may be several such stages in a superheterodyne radio receiver. FreQuency is a music video game developed by Harmonix and published by SCEI. It was released in November 2001. ... Carrier frequency is the fundamental frequency used in both amplitude modulation and frequency modulation i. ... In telecommunications, transmission is the act of transmitting electrical messages (and the associated phenomena of radiant energy that passes through media). ... Look up reception in Wiktionary, the free dictionary. ... Interference of two circular waves - Wavelength (decreasing bottom to top) and Wave centers distance (increasing to the right). ... The Superheterodyne receiver (or to give it its full name, The Supersonic Heterodyne Receiver – usually these days shortened to superhet) was invented by Edwin Armstrong in 1918. ... In electronics, the superheterodyne receiver (also known by its full name, the supersonic heterodyne receiver, or by the abbreviated form superhet) is a technique for selectively recovering the information from radio waves of a particular frequency. ... For the British rock band of the same name, see Amplifier (band). ... In general, detection is the extraction of intelligence from a carrier signal in a communication system. ... For the device which is a tuner (radio) and a amplifier and/or loudspeaker, see receiver (home stereo). ...

Contents

Commonly used intermediate frequencies ranges are as given below

Television

  • 41Mhz to 900MHz

FM radio

  • 5.5 MHz
  • 10.7 MHz

AM radio

  • 455 kHz
  • 460 kHz
  • 465 kHz
  • 470 kHz
  • 475 kHz
  • 480 kHz

Other

In some double superheterodyne receivers, first an intermediate frequency of 1.6MHz is used followed by a second intermediate frequency of 470kHz.


  Results from FactBites:
 
Intermediate frequency - definition of Intermediate frequency in Encyclopedia (579 words)
Tuned Radio Frequency (TRF) receivers suffered from poor frequency stability, and poor selectivity, as even filters with a high Q factor have a wide bandwidth at radio frequencies.
In radios using the principle, all signal frequencies are converted typically to a constant lower frequency before detection.
Super Heterodyne receivers "beat" or heterodyne a frequency from a local oscillator (within the receiver) with the incoming signal.
Intermediate frequency FM receiver using analog oversampling to increase signal bandwidth - Patent 5483695 (4518 words)
Frequency modulation refers to the process whereby the frequency of a carrier signal is modulated by a message signal--the amplitude of the carrier signal is intended to remain constant.
Superheterodyne FM receivers which use such high intermediate frequencies may be largely integrated in a single integrated circuit, however the signal processing involved in such receivers necessitates the use of off-chip tuned LC circuits, and ceramic or surface acoustic wave (SAW) filters in the RF, heterodyning and demodulation stages of the receiver.
As the frequency of the modulated intermediate-frequency signal is multiplied by a factor of n, the demodulated bandwidth of the message signal is thus correspondingly increased by a factor of n without requiring a change in the intermediate frequency used in the FM receiver.
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