METHOD OF DUPLEX TRANSMISSION OF DIGITAL INFORMATION OVER TWO-WIRE CIRCUIT AND DEVICE FOR ITS REALIZATION Russian patent published in 1997 - IPC

FIELD: electric communication, applicable for organization of duplex communication of a party or group of parties with an automatic telephone exchange over a two-wire circuit, with provision of main access to the digital circuit. SUBSTANCE: at a transmission of signal from party 1 towards automatic telephone exchange 5 the signal is converter to a three-level bipolar sequence by means of converter 2 realizing a transition from a random binary signal to a bipolar one, in which alternation of polarity of unit amplitude pulses occurs. At a transmission of signal from electronic automatic telephone exchange 5 towards party 1 the signal is converter to a multi-level sequence by means of converter 6 realizing a transition from a random binary signal to an absolute bipulse sequence with predistortion of pulse amplitudes. EFFECT: simplified device realizing the method of duplex transmission of digital information over a two-wire circuit, expanded abilities of application of this method. 2 cl, 17 dwg