Transmitting electrical signals with a transmission time independent of distance between transmitter and receiver
First Claim
1. A signal transmission system comprisingtransmission line means,at least one receiver connected to said line means, andsignal generator means connected to said line means for transmitting first and second ramp-shaped electrical signals to said receiver along respective first and second, oppositely-directed paths,the maximum distance along said line means between a said receiver and signal generator means defining a full length for said line means,said receiver comprising means for sensing when the combination of said first and second signals arriving at said receiver reaches a predetermined trigger state,each of said first and second ramp-shaped signals varying progressively with time through a range of levels between a first level and a second level, said variation initiating at a leading edge, andthe rate of said progressive variation being selected so that said variation continues over a time period greater than the time required for the leading edge of the respective signal to propagate along said full length of said line, and so as to cause said signal combination to reach said trigger state at a time independent of the relative positions of said receiver and said signal generator means along said line means.
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Abstract
Two time varying signals are transmitted in opposite directions over transmission means between signal generator means and a signal receiver. The signal receiver includes means for sensing when the combination of signals arriving at the receiver reaches a predetermined trigger state, and the generator means includes means for causing the signals to vary with time in a manner selected to cause the signal combination to reach the trigger state at a time dependent upon the length of the transmission means but independent of the distance between the generator and receiver.
133 Citations
15 Claims
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1. A signal transmission system comprising
transmission line means, at least one receiver connected to said line means, and signal generator means connected to said line means for transmitting first and second ramp-shaped electrical signals to said receiver along respective first and second, oppositely-directed paths, the maximum distance along said line means between a said receiver and signal generator means defining a full length for said line means, said receiver comprising means for sensing when the combination of said first and second signals arriving at said receiver reaches a predetermined trigger state, each of said first and second ramp-shaped signals varying progressively with time through a range of levels between a first level and a second level, said variation initiating at a leading edge, and the rate of said progressive variation being selected so that said variation continues over a time period greater than the time required for the leading edge of the respective signal to propagate along said full length of said line, and so as to cause said signal combination to reach said trigger state at a time independent of the relative positions of said receiver and said signal generator means along said line means.
Specification