File:Superheterodyne image problem-ru.svg
Original file (SVG file, nominally 847 × 652 pixels, file size: 2 KB)
Captions
Summary[edit]
DescriptionSuperheterodyne image problem-ru.svg |
English: Diagram of the radio signals at different points in a superheterodyne radio receiver showing the problem of image response and why the receiver needs an RF image filter on the input. The horizontal axis is frequency while the vertical axis is voltage. The diagrams show what would happen in a superheterodyne without an RF filter.
In the superheterodyne the signal of the desired radio station (S1, blue) at frequency is mixed with a sinusoidal signal from a local oscillator (LO) at frequency , producing a heterodyne or "beat" frequency at the difference between the two frequencies, called the intermediate frequency (IF) at . After being shifted to the intermediate frequency, the signal S1 passes through the IF filter which removes signals at all other frequencies, and is demodulated. However there is a second frequency on the other side of the LO frequency which also produces a heterodyne at the IF frequency when mixed with the LO. This is called the image frequency . Thus the superheterodyne receives on two frequencies: Русский: Графики радиосигналов в разных точках супергетеродинного радиоприемника иллюстрирующие возникновение и прохождение по тракту помехи с зеркальной частотой и поясняющая почему приемнику обычно необходим входной радиочастотный фильтр. По горизонтальной осотложена частота сигналов, а вертикальная ось — напряжение, или на красном графике коэффициент передачи фильтра в зависимости от частоты. На диаграммах показано влияние помехи по зеркальному каналу в супергетеродине без входного фильтра. В супергетеродине сигнал нужной радиостанции (S1, синий) на частоте смешанный с синусоидальным сигналом от гетеродина на частоте , образуя биения с частотой равной разности частот сигнала и гетеродина, эта частота называется промежуточной частотой (ПЧ) в . После смешения в смесителе сигнал S1 проходит через фильтр ПЧ, который блокирует сигналы всех других частот и далее демодулируется. |
Date | |
Source | File:Superheterodyne image problem.svg by Chetvorno |
Author | Д.Ильин: translation, optimization |
Other versions |
|
This SVG file contains embedded text that can be translated into your language, using any capable SVG editor, text editor or the SVG Translate tool. For more information see: About translating SVG files. |
Licensing[edit]
This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. | |
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 17:09, 6 May 2023 | 847 × 652 (2 KB) | Д.Ильин (talk | contribs) |
You cannot overwrite this file.
File usage on Commons
The following 3 pages use this file:
File usage on other wikis
The following other wikis use this file:
- Usage on ru.wikipedia.org
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Width | 239mm |
---|---|
Height | 184mm |