DIGITAL TELEPHONE SET Russian patent published in 1994 - IPC

FIELD: equipment for electric communications. SUBSTANCE: device has microphone 1, two amplifiers 2, 5, encoder 3, decoder 4, telephone 6, dialing signal generator 7, keypad 8, number code signal generator 9, operation mode signal generator 10, turning-on unit 11, signal selector 12, dial bus 13, transmission information signal generator 14, synchronization pulse selector 15, information signal selector 16, signal combination unit 17, counter 18, user line signal bus 19, unit 20 for interface between two-wire and four-wire channel circuits, activity signal generator 21, activity permission signal generator 22, power-on signal generator 23, scrambler 24, unscrambling circuit 25, unit 26 for generation of prohibition interval after turn-on, guard mode signal generator 27, permission interval generator 28, scrambling start unit 29. EFFECT: increased functional capabilities. 1 dwg