Method and apparatus for transmitting binary data signals by fre

Details Method and apparatus for transmitting binary data signals by fre Method and apparatus for transmitting binary data signals by fre

1986-07-07

1988-02-09

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

332 16R, H04L 2712

Patent

active

047245344

ABSTRACT:
A modulator for modulating binary data signals by frequency shift keying (FSK), in which a binary data level 1 is represented by a first frequency (f.sub.1) and the binary data level 0 is represented by a second frequency (f.sub.2) is provided. The modulator addresses a first addressing input of a programmable memory with the binary data signals, in which half the periods of the two frequencies (f.sub.1, f.sub.2) are marked in two memory regions (I, II) of the programmable memory addressed by the first addressing input. The modulator further controls other address inputs with a driven counter; and generates a pulse resetting the counter and controlling a 2:1 frequency divider having an output delivering one of the frequencies (f.sub.1, f.sub.2), when addressing a storage cell, in which one of the halfperiods is marked.

REFERENCES:
patent: 4003001 (1977-01-01), Jones, Jr.
patent: 4227248 (1980-10-01), Munter
patent: 4410955 (1983-10-01), Burke et al.
patent: 4613976 (1986-09-01), Sewerinson et al.

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