This is another modulation technique (see Frequency Modulation) used to transmit data. It shifts the frequency above and below the carrier frequency (representing 1 and 0, respectively).
The form of frequency modulation that uses two separate audio frequencies to transmit binary ones and zeros.
The technique used by the CCITT V.12 and Bell 103 communication protocols where `0' and `1' bits are assigned to a specific frequencies in transmit and receive directions. Signalling rate equals bit rate.
A modulation scheme that shifts between two frequencies to represent a "1" or "0" state of data transmission.
A modulation scheme for data communications using a limited number of discrete frequencies to convey binary information. Used by earlier modems V.21, V.22 etc.
It's a form of frequency modulation for digital signals, where the bits are quantified by various frequencies.
A digital modulation scheme that uses a different frequency to represent different binary levels.
A frequency modulation technique used to send digital data over voice band telephone lines.
A frequency modulation technique in which one frequency represents a mark and a second, a space.