ASFK is another subject than FSK. One is a modulation to transmit signal over radio frequencies, while the other is a manner to join different audio frequencies as used in telephony to transmit information. Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier wave. Audio frequency-shift keying (AFSK) is a modulation technique by which digital data is represented as changes in the frequency (pitch) of an.
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This doesn't make sense. If it were operating at baseband, the data rate would change depending on the current frequency being transmitted, and the signal would be difficult impossible?
The common Bell modem used this technique, for example. Display the difference between the envelope of the resulting two signals.
Can you see the bits? Filter the signal and compute the difference between the envelopes of the results use signal. The bit value is the value of the NRZ function in the middle of the bit period.
Decode the audio frequency shift keying and compare to the original ones. With this scheme, the "1" is called the mark frequency and the "0" is called the space frequency. It's more of a recognition that the different types exist than an attempt to define a single "standard".
It sends the data after the audio frequency shift keying ring tone and uses the bits per second Bell tone modulation. It is used by BT, wireless networks like the late Ionicaand some cable companies.