Method and apparatus for transmitting auxiliary channel over dig

Details Method and apparatus for transmitting auxiliary channel over dig Method and apparatus for transmitting auxiliary channel over dig

1977-03-30

1978-03-14

Stewart, David L.

179 15BD, 179 15BY, H04J 110, H04J 900

Patent

active

040792030

ABSTRACT:
An auxiliary channel, for example, an engineering orderwire, is derived on n existing time-division multiplex carrier system by modulating the pulse repetition rate of the digital bitstream. The modulating signal itself may be an analog or a digital signal. The modulator and demodulator both include a first-in, first-out shift register acting as a buffer, and the desired modulation is effected by varying the rate at which the digital information is fed out of the FIFO buffer at the transmitting end of the carrier system.

REFERENCES:
patent: 3093815 (1963-06-01), Karnaugh
patent: 3553367 (1971-01-01), Krauss
patent: 3569631 (1971-03-01), Johannes
patent: 3579281 (1971-05-01), Kam

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