superhétérodyne - traducción al francés
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superhétérodyne - traducción al francés

COMMON TYPE OF RADIO RECEIVER THAT SHIFTS THE RECEIVED SIGNAL TO AN EASILY-PROCESSED INTERMEDIATE FREQUENCY
Superheterodyne; Image frequency; Superhet; Super Heterodyne receiver; Supersonic heterodine receiver; Heterodyne receiver; Superheterodyne Reception; Supersonic heterodyne receiver; Mirror frequency; Superheterodyne Receivers; Double super; Supersonic heterodyne; Supersonic Heterodyne; Dual-conversion superheterodyne; Double-conversion superheterodyne; Double conversion superheterodyne; Dual conversion superhet; Dual-conversion superhet; Double-conversion superhet; Double conversion superhet; Dual conversion (superhet); Dual-conversion (superhet); Double-conversion (superhet); Double conversion (superhet); Triple conversion superheterodyne; Triple-conversion superheterodyne; Triple conversion superhet; Triple-conversion superhet; Triple conversion (superhet); Triple-conversion (superhet); Dual conversion superheterodyne
  • Double conversion superheterodyne receiver block diagram
  • 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.
  • r=-1}}). It used 6 triodes: a mixer, local oscillator, two IF and two audio amplifier stages, with an IF of 45 kHz. It was a commercial success, with better performance than competing receivers.
  • Superheterodyne [[transistor radio]] circuit circa 1975
  • Graphs illustrating the problem of image response in a superheterodyne. The horizontal axes are frequency and the vertical axes are voltage. Without an adequate RF filter, any signal S2 ''<span style="color:green;">(green)</span>'' at the image frequency <math>f_\text{IMAGE}</math> is also heterodyned to the IF frequency <math>f_\text{IF}</math> along with the desired radio signal S1 ''<span style="color:blue;">(blue)</span>'' at <math>f_\text{RF}</math>, so they both pass through the IF filter ''<span style="color:red;">(red)</span>''. Thus S2 interferes with S1.
  • Block diagram of a typical superheterodyne receiver. <span style="color:red;">Red</span> parts are those that handle the incoming radio frequency (RF) signal; <span style="color:green;">green</span> are parts that operate at the intermediate frequency (IF), while <span style="color:blue;">blue</span> parts operate at the modulation (audio) frequency. The dotted line indicates that the local oscillator and RF filter must be tuned in tandem.
  • A 5-tube superheterodyne receiver made in Japan circa 1955

superhétérodyne      
superheterodyne
superhétérodyne      
n. superheterodyne

Definición

superheterodyne
[?su:p?'h?t(?)r?(?)d??n]
¦ adjective denoting or using a system of radio and television reception in which the receiver produces a tunable signal which is combined with the incoming signal to produce a predetermined intermediate frequency, on which most of the amplification is formed.
Origin
1920s: from supersonic + heterodyne.

Wikipedia

Superheterodyne receiver

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.