| 摘要 |
1,179,056. Data transmission. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 5 April, 1968 [8 April, 1967], No. 16539/68. Heading H4P. A transmitter for binary pulse signals comprises a binary pulse source 1 whose pulse instants coincide with equidistant sequential clock pulses, and a coding device incorporating a feedback shift register 4, the shift register input being derived from a first modulo-2 adder 11 receiving pulses from the source and the feedback loop, and the latter being derived from a further modulo-2 adder 13 receiving pulses delayed by integral numbers of clock periods and which are derived from the outputs of certain shift register elements. A prescribed transfer function of the transmitter is obtained by interconnecting the outputs of the shift register elements through respective attenuation networks 15-21 to a summation device 22 from which the output signal of the transmitter is derived. The shift period is a sub-multiple of the clock period, and a pulse regenerator 25 controlled by the clock pulses may be inserted between the first modulo-2 adder 11 and the shift register input to ensure that the input feedback signal includes pulses solely of clock period duration. A mathematical analysis is included. Specification 1,044,412 is referred to. |
