Fail-safe pulse providing apparatus
First Claim
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1. In fail-safe pulse providing apparatus responsive to an input signal comprising a plurality of time control pulses followed by a pulse gap, the combination of:
- switch means coupled with the input signal for initiating a voltage pulse in response to one of said time control pulses or said pulse gap and terminating said voltage pulse in response to the other of said one time control pulse or said pulse gap,a first impedance member,energy storage means responsive to said voltage pulse and coupled with the first impedance member and the switch means for storing a predetermined amount of energy as determined by the duration of said voltage pulse,a second impedance member,a light emitting diode coupled with the storage means and the second impedance member for providing a desired photon output in accordance with the discharge of said predetermined amount of stored energy in response to said voltage pulse, andphoto-responsive switch means for providing an output pulse in accordance with said desired photon output.
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Abstract
There is disclosed improved time slot scanner control apparatus, including a fail-safe control pulse former apparatus provided for each of a desired plurality of information time slots to sequence the data information transfer in relation to the respective track circuits operative with a transit vehicle. An information timing track is provided for sequencing this data information transfer and to reset the apparatus after each provided sequence of time slot control pulses.
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Citations
6 Claims
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1. In fail-safe pulse providing apparatus responsive to an input signal comprising a plurality of time control pulses followed by a pulse gap, the combination of:
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switch means coupled with the input signal for initiating a voltage pulse in response to one of said time control pulses or said pulse gap and terminating said voltage pulse in response to the other of said one time control pulse or said pulse gap, a first impedance member, energy storage means responsive to said voltage pulse and coupled with the first impedance member and the switch means for storing a predetermined amount of energy as determined by the duration of said voltage pulse, a second impedance member, a light emitting diode coupled with the storage means and the second impedance member for providing a desired photon output in accordance with the discharge of said predetermined amount of stored energy in response to said voltage pulse, and photo-responsive switch means for providing an output pulse in accordance with said desired photon output. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification