FM Tutorial

FM Tutorial Free App

Rated 3.19/5 (37) —  Free Android application by Frequent Mind

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About FM Tutorial

This app demonstrates how frequency modulation (FM) is used in FM synthesizers to generate sounds.
The app plays the FM sound, displays the carrier, modulator and resulting modulated wave as well as the power spectrum and the real and imaginary parts of the spectrum.
Sound and display are changed in real-time as the user modifies the following parameters.

Modulation Index (Beta):
"Depth" of modulation. The larger this value the more the carrier wave gets "warped"
and the more harmonics appear in the spectrum

Carrier Phase (Phi):
Shifting the phase of the carrier against the modulator changes the form of the
modulated wave and the spectrum.

Carrier and modulator frequencies: These can also be altered.

A Help button (?) for a brief description of the buttons and a more detailed Help in the Menu are available.

The More button (upside down triangle) lets you toggle through the various parameter settings.

Switch additional spectra (real and imaginary) on and off by up and down fling on the screen.
Zoom in/out by right/left fling across waves or spectrum (they zoom independently).

FM synthesis explained:
In a nutshell, FM synthesis works by changing the frequency of a sound wave (carrier) in accordance with the current value of a second wave, the modulating wave (modulator). If carrier and modulator have the same frequency then the increase and decrease of the carrier wave's frequency takes place within the space of one period of the wave. The result is that the shape of the wave is changed while the
period stays the same. If the un-modulated carrier is a sine wave then the modulated will be deformed into something different. This means the spectrum gets additional harmonics, i.e. the sound changes and becomes richer.
A similar effect occurs when carrier and modulator frequencies form small integer ratios.

FAQ:
Q: Why does the wave change faster/slower when LFO and/or Detune are ON and I toggle speaker ON/OFF (using the button in the app)?
A: When the speaker is OFF then the speed with which the display changes can vary between devices, depending on how fast the number crunching is performed.

How to Download / Install

Download and install FM Tutorial version 1.2 on your Android device!
Downloaded 10,000+ times, content rating: Everyone
Android package: com.frequentmind.fmtutorial, download FM Tutorial.apk

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Free
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Android
2.2+
Bug
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Android app

App History & Updates

What's Changed
Important bug fix.
Version update FM Tutorial was updated to version 1.2
More downloads  FM Tutorial reached 10 000 - 50 000 downloads
More downloads  FM Tutorial reached 5 000 - 10 000 downloads

What are users saying about FM Tutorial

W70%
by W####:

This app teaches almost nothing about FM synthesis; I'm very confused at what the Dev meant to achieve here.

T70%
by T####:

Plz come with amplitude modulation

T70%
by T####:

Plz add some thery material to understand the fm properly As lai ppl wil nt understand this

P70%
by P####:

Nice app with good features..!!!

G70%
by G####:

Excellent app.

I70%
by I####:

its tricky to use but it well explained me the relationship of the compoments of a FM. helps me with my communication subject.thanks by the way.


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Rating Distribution

RATING
3.25
37 users

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