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superheterodyne$548971$ - tradução para grego
![How a superheterodyne radio works. The horizontal axes are frequency ''f''. The blue graphs show the voltages of the radio signals at various points in the circuit. The red graphs show the [[transfer function]]s of the filters in the circuit; the thickness of the red bands shows the fraction of signal from the previous graph that passes through the filter at each frequency. The incoming radio signal from the antenna ''(top graph)'' consists of the desired radio signal ''S1'' plus others at different frequencies. The RF filter ''(2nd graph)'' removes any signal such as ''S2'' at the [[image frequency]] ''LO'' - ''IF'', which would otherwise pass through the IF filter and interfere. The remaining composite signal is applied to the mixer along with a local oscillator signal (''LO'') ''(3rd graph)''. In the mixer the signal ''S1'' combines with the LO frequency to create a heterodyne at the difference between these frequencies, the intermediate frequency (IF), at the mixer output ''(4th graph)''. This passes through the IF bandpass filter ''(5th graph)'' is amplified and demodulated (demodulation is not shown). The unwanted signals create heterodynes at other frequencies ''(4th graph)'', which are filtered out by the IF filter .](https://commons.wikimedia.org/wiki/Special:FilePath/How superheterodyne receiver works.svg?width=200 "How a superheterodyne radio works. The horizontal axes are frequency ''f''. The blue graphs show the voltages of the radio signals at various points in the circuit. The red graphs show the [[transfer function]]s of the filters in the circuit; the thickness of the red bands shows the fraction of signal from the previous graph that passes through the filter at each frequency. The incoming radio signal from the antenna ''(top graph)'' consists of the desired radio signal ''S1'' plus others at different frequencies. The RF filter ''(2nd graph)'' removes any signal such as ''S2'' at the [[image frequency]] ''LO'' - ''IF'', which would otherwise pass through the IF filter and interfere. The remaining composite signal is applied to the mixer along with a local oscillator signal (''LO'') ''(3rd graph)''. In the mixer the signal ''S1'' combines with the LO frequency to create a heterodyne at the difference between these frequencies, the intermediate frequency (IF), at the mixer output ''(4th graph)''. This passes through the IF bandpass filter ''(5th graph)'' is amplified and demodulated (demodulation is not shown). The unwanted signals create heterodynes at other frequencies ''(4th graph)'', which are filtered out by the IF filter .")
![mixer]] and [[local oscillator]] ''(left)'' and three IF amplification stages and a detector stage ''(right)''. The intermediate frequency was 75 kHz.](https://commons.wikimedia.org/wiki/Special:FilePath/Prototype Armstrong superheterodyne receiver 1920.jpg?width=200 "mixer]] and [[local oscillator]] ''(left)'' and three IF amplification stages and a detector stage ''(right)''. The intermediate frequency was 75 kHz.")
![Superheterodyne [[transistor radio]] circuit circa 1975](https://commons.wikimedia.org/wiki/Special:FilePath/Superheterod radio.JPG?width=200 "Superheterodyne [[transistor radio]] circuit circa 1975")
Definição
Wikipédia
A superheterodyne receiver, often shortened to superhet, is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency. It was long believed to have been invented by US engineer Edwin Armstrong, but after some controversy the earliest patent for the invention is now credited to French radio engineer and radio manufacturer Lucien Lévy. Virtually all modern radio receivers use the superheterodyne principle; except software-defined radios, which use direct sampling.
