File:Bandpass filtering in a radio receiver.svg
Original file (SVG file, nominally 647 × 672 pixels, file size: 157 KB)
Captions
Summary[edit]
DescriptionBandpass filtering in a radio receiver.svg |
English: Graphs showing how a bandpass filter in a radio receiver selects the desired radio signal from all the radio signals received by the antenna. The center graph shows the voltage from the antenna Vant as a function of frequency. f. The antenna typically receives many radio signals at different frequencies so the antenna voltage is a composite of different radio signals; here 4 are shown: S1, S2, S3, and S4. Each radio signal consists of a carrier wave (C) at the center frequency, with the information bearing modulation contained in two sidebands (SB) on either side of the carrier. The antenna also picks up radio noise (N) from the atmosphere. To receive a single radio station, the current from the antenna is passed through a bandpass filter consisting of several tuned circuits. The filter passes the frequency of the desired station, S1, and blocks signals at all other frequencies. The transfer function (TF) of the filter is shown in red in the top graph. The passband (PB) of the filter is centered on the desired station S1. The bandwidth (BW) of the passband must be wide enough to pass the sidebands without distortion, but narrow enough to reject interfering radio signals on adjacent frequencies, such as S2. The output of the filter Vfilter is shown at bottom. This signal is amplified, then the modulation is extracted from the radio frequency carrier wave by a demodulator circuit, and applied to a speaker. |
Date | |
Source | Own work |
Author | Chetvorno |
SVG development InfoField | This diagram was created with Inkscape, or with something else. This diagram uses translateable embedded text. |
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
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 02:25, 9 May 2017 | 647 × 672 (157 KB) | Chetvorno (talk | contribs) | Replaced invalid Inkscape SVG version with "plain SVG" version that validates | |
05:15, 18 April 2017 | 647 × 672 (184 KB) | Chetvorno (talk | contribs) | Made graph less cluttered; deleted unnecessary shading and extra length of dotted lines | ||
20:58, 20 March 2017 | 647 × 672 (187 KB) | Chetvorno (talk | contribs) | Reorganized graphs to place filter between input and output and added gradients and more labels | ||
21:25, 19 March 2017 | 717 × 610 (198 KB) | Chetvorno (talk | contribs) | Changed names of some variables to make it consistent with text | ||
18:40, 19 March 2017 | 717 × 610 (198 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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Width | 647.14288 |
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Height | 671.55518 |