Transmission link
First Claim
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1. A transmission link for transmitting a sequence of pulses and intervals over a transmission medium comprising:
- a transmitter including means for modulating pulses with at least two frequencies to form modulated pulse signals containing said two frequencies;
a receiver having a separate evaluation circuit corresponding to each modulation frequency, each evaluation circuit having as an input said modulated pulses and providing a demodulated output; and
an AND-gate circuit, having at least two inputs, each input being coupled to a respective output of one of said evaluation circuits, whereby said AND-gate circuit concatenates the demodulated pulse signals appearing at the outputs of said evaluation circuits
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Abstract
A transmission link for transmitting a sequence of signals comprising pulse and interval signals, across a transmission medium from a transmitter to a receiver circuit of a receiver, whereby each pulse signal is modulated with a frequency. At least two frequencies are used to modulate the pulses, and a separate evaluation circuit is provided in the receiver for each modulating frequency. The output signals of the evaluation circuits are concatenated (linked in series) by a AND-gate circuit.
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18 Claims
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1. A transmission link for transmitting a sequence of pulses and intervals over a transmission medium comprising:
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a transmitter including means for modulating pulses with at least two frequencies to form modulated pulse signals containing said two frequencies; a receiver having a separate evaluation circuit corresponding to each modulation frequency, each evaluation circuit having as an input said modulated pulses and providing a demodulated output; and an AND-gate circuit, having at least two inputs, each input being coupled to a respective output of one of said evaluation circuits, whereby said AND-gate circuit concatenates the demodulated pulse signals appearing at the outputs of said evaluation circuits - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of transmitting a sequence of pulses and intervals over a transmission medium comprising:
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modulating pulses with at least two frequencies to form modulated pulses containing said two frequencies; transmitting said modulated pulses over the medium; seperately receiving said modulated pulses; evaluating said pulses at each modulating frequency; and ANDing the respective results of said evaluations whereby said evaluation results will be concatenated. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification