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Frequency Analyzer

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Description

Type:
apllication(EXE)

OS: windows



This is an amazing
mini software which is able to convert sound in to mathematical charts(spectrum).

It's very small but it's
work is very big.

Try it now..

I certifies that this is not a
virus/malware/trojen 



How
this works 

First, the microphone converts sounds into voltage. Then, your sound card acts
as a very fast digital voltmeter. It measures the voltage as often as 11,025 -- up to 44,100 times per second. You can
set this number-of-measurement-per-second parameter using a drop-down combo box "Sampling Frequency" (here it shows 11
kHz) Each measurement is converted into an 8- or 16-bit number called a sample. 16-bit numbers allow for more accuracy
in measuring subtle effects. You can select this parameter by clicking on one of the "Bits per sample" radio buttons.

The result of sampling is a series of numbers. This series is displayed in the upper right pane of the Frequency
Analyzer. That's where you can see the sine wave produced by your whistling. The bottom pane shows the spectrum of the
sound (see explanation below).

Every sound can be represented as a combination of sine waves of various
frequencies. Mathematically, this splitting into component frequencies is called a Fourier transform. There are many
ways of calculating the Fourier transform-- some of them faster, some of them slower. The best algorithm invented so far
is called the Fast Fourier Transform (FFT). It calculates a Fourier transform of a digital signal using the
divide-and-conquer method. It takes a certain number of samples (has to be a power of 2) and calculates the "spectrum,"
or the intensities of various sine waves that are the components of that sound. You can select the number of samples
that go into a single transform using the "Points per Transform" combo box. The more points, the finer the transform,
i.e., the more frequencies can be detected. If you look at the scale on the left of the main display pane, you'll see
that it changes when you change the "Points per transform" parameter. By the way, the shorter marks are spaced every 100
Hz, the longer ones every 1000 Hz (1 kHz).

Since the sound usually changes with time, the Fourier transform
is calculated many times per second. You can adjust this parameter using the "Speed (FFT's per sec)" slider (in the
picture, it shows 10 FFT's per second). If you have a slower computer, be careful changing this parameter, as your
processor might not be able to catch up with the speed with which the sound card is sending samples (the system might
suddenly become sluggish and you might have to kill the Frequency Analyzer using the Windows 95 application bar).

Here's how you interpret the main pane of the Frequency Analyzer: There is a white vertical line moving from
left to right. It leaves behind a colorful trace. The colors correspond to the intensities of various components of the
sound. For instance, if you whistle into the microphone a pure sine wave of the frequency 1 kHz (you can easily learn to
do it using the feedback from the Frequency Analyzer), the Fourier transform will have a sharp peak at 1 kHz. You'll see
the program draw a thin line, probably red or yellow, depending on the volume, at the height corresponding to 1 kHz. If
you lower the pitch of your whistle, the line will move downwards. If you increase the pitch, it will turn upwards. When
you say "aaah," you'll see several horizontal lines corresponding to the harmonics of your voice. You'll probably find
it fascinating to be able to "look" at various sounds. You'll need at least a 486 computer, although a Pentium would be
better. Only a few years ago only the fastest computers or dedicated hardware systems were able to perform a real time
FFT. And now you can have a gadget on your desktop that does it for free. Computers are amazing, aren't they?

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