This Demonstration creates a white-noise sequence and then uses a low-pass filter to produce a red-noise sequence. The "filter cut-off" is
the fractional point in [0, 1] on the spectral frequency axis to apply the filter, as measured from zero frequency. The rate of suppression
of frequencies larger than the filter cut-off is given by the "filter roll-off" exponent n (1 to 4); larger values of n mean greater suppression
of the higher frequencies. A new time sequence is generated with the "randomize" button. The amplitude spectrum of the time series is plotted
simultaneously, with spectral values on a log scale, out to the Nyquist frequency.
Where one computer shows the restaurant's plain password
request page, and another is filled with computer code, which
the FBI has started to decipher.
Amita, that's the restaurant's
computer hard drive...
Our techs could crack it -- but
you're faster and I don't have a lot
The RSA cryptosystem was invented by R. Rivest,
A. Shamir, and L. Adleman. This Demonstration
1) generates a large RSA modulus n (up to 700 decimal digits);
2) creates the corresponding public and private keys, e and d;
3) provides a simple, practical way to encrypt and decrypt messages in various UNICODE supported languages.
Same in audiology. We shrink sounds
we don't want so the sound we do want
We use filters to diminish or blur
noise -- identifying each unwanted
sound by its frequency, then
discriminating against it.
After selecting the colors using the controls, imagine that one color is picked at random from each disk. The order of the combination of colors
is not important; for example, red, blue, orange is considered the same combination as red, orange, blue.