FACTOID # 91: In the Maldives, there are more than 2 jails for every 1000 people.
 
 Home   Encyclopedia   Statistics   Countries A-Z   Flags   Maps   Education   Forum   FAQ   About 
 
WHAT'S NEW
RECENT ARTICLES
More Recent Articles »
 

FACTS & STATISTICS    Simple view

  1. Select countries to view: (hold down Control key and click to select several)

     

     

    Compare:

     

     
  1. Select fact or statistic: (* = graphable)

     

     

     

  2. (OPTIONAL) Compare to statistic: (both need to be graphable)

     

     

     

  3. View result as:

     

       
(OR) SEARCH ALL encyclopedia, stats & forums:   

Encyclopedia > Modulation index

The modulation index (mf) is defined as the ratio of the frequency deviation σ to the modulating signal frequency fi, i.e.,

mf = σ/fi.

  Results from FactBites:
 
Frequency modulation - Wikipedia, the free encyclopedia (927 words)
Frequency modulation (FM) is a form of modulation which represents information as variations in the instantaneous frequency of a carrier wave.
Note that frequency modulation can be regarded as a special case of phase modulation where the carrier phase modulation is the time integral of the FM modulating signal.
With a tone-modulated FM wave, if the modulation frequency is held constant and the modulation index is increased, the (non-negligible) bandwidth of the FM signal increases, but the spacing between spectra stays the same.
Amateur Radio application of Frequency Modulation (3127 words)
Phase Modulation (PM) is a similar system where the phase of the carrier wave is varied in sympathy with the voltage of the modulating signal, and as in frequency modulation, the amplitude of a carrier is held constant.
The modulation index due to the noise voltage is constant for different noise frequencies, differently to the modulation index for the desired modulation signal which decreases with increasing modulating frequency (for FM).
The modulation index is 2.4, and the deviation is 2.88kHz.
  More results at FactBites »


 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments
Please enter the 5-letter protection code

Want to know more?
Search encyclopedia, statistics and forums:
 


Lesson Plans | Student Area | Student FAQ | Reviews | Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms.