Impulse duration modulator

Claim 2

An impulse modulator comprising: a. a monostable multivibrator having a stable and an astable electrical state and including a charging capacitor, an input, an output and a power supply having voltage E, b. a constant current generator having an output for charging said capacitor, c. a voltage comparator connected to said constant current generator output, d. a first voltage source, supplying a first modulating voltage, V1, and connected to said comparator, said comparator triggering said monostable multivibrator back to its stable state as soon as the voltage on said capacitor reaches the instantaneous value of said first modulating voltage, e. voltage-to-current converting means having an input terminal and an output terminal, said output terminal connected to said constant current generator, f. a second voltage source, supplying a second modulating voltage, V2, and connected to said input terminal of said voltage-to-current converting means, whereby the duration of the impulse from said output of the monostable multivibrator is proportional to the ratio (V1+E)/V2.

Claim 3

An impulse modulator as recited in claim 1 wherein said constant current generator comprises a transistor having a collector connected to said comparator and a base connected to said output terminal of said voltage-to-current converting means.

Claim 4

An impulse modulator as recited in claim 1 wherein said voltage-to-current converting means comprises a differential amplifier.

Claim 5

An impulse modulator as recited in claim 1 wherein said constant current generator comprises a semi-conductor device having a first electrode connected to said comparator and a second electrode connected to said output terminal of said voltage-to-current converting means.

Claim 6

An impulse modulator comprising: a. a first monostable multivibrator having a stable and an astable electrical state and including a charging capacitor, an input, an output and a power supply having voltage E, b. a first constant current generator having an output for charging said capacitor, c. a first voltage comparator connected to said first constant current generator output, d. a first voltage source, supplying a modulating voltage V1 and connected to said first voltage comparator, said first voltage comparator triggering said first monostable multivibrator back to its stable state as soon as the voltage on said capacitor of said first monostable multivibrator reaches the instantaneous value of said first modulating voltage, e. a first voltage-to-current converting means having an input terminal and an output terminal, said output terminal connected to said first constant current generator, f. a second voltage source, supplying a modulating voltage V2 and connected to said input terminal of said first voltage-to-current converting means, whereby the duration of the impulse from said output of the first monostable multivibrator is proportional to the ratio (V1+E)/V2, g. a second monostable multivibrator having a stable and an astable electrical state and including a charging capacitor, an input, an output and a power supply having voltage E, h. a second constant current generator having an output for charging said capacitor of said second monostable multivibrator, i. a second voltage comparator connected to said second constant current generator output and to ground potential, j. a second voltage-to-current converting means having an input terminal and an output terminal, said output terminal connected to said second constant current generator and said input terminal connected to said second modulating voltage source, and k. an anticoincidence circuit having a first input connected to the oUtput of said first monostable multivibrator and a second input connected to the output of said second monostable multivibrator, said anticoincidence circuit having an output pulse whose duration is proportional to the ratio V1/V2.

Claim 7

An impulse modulator comprising: a. a first monostable multivibrator having a stable and an astable electrical state and including a charging capacitor, an input, an output and a power supply having voltage E, b. a first constant current generator having an output for charging said capacitor, c. a first voltage comparator connected to said first constant current generator output, d. a first voltage source, supplying a modulating voltage V1 and connected to said first voltage comparator, said first voltage comparator triggering said first monostable multivibrator back to its stable state as soon as the voltage on said capacitor of said first monostable multivibrator reaches the instantaneous value of said first modulating voltage, e. a first voltage-to-current converting means having an input terminal and an output terminal, said output terminal connected to said first constant current generator, f. a second voltage source, supplying a modulating voltage V2 and connected to said input terminal of said first voltage-to-current converting means, whereby the duration of the impulse from said output of the first monostable multivibrator is proportional to the ratio (V1+E)/V2, g. a second monostable multivibrator having a stable and an astable electrical state and including a charging capacitor, an input, an output and a power supply having voltage E, h. a second constant current generator having an output for charging said capacitor of said second monostable multivibrator, i. a second voltage comparator connected to said second constant current generator output and to ground potential, j. a second voltage-to-current converting means having an input terminal and an output terminal, said output terminal connected to said second constant current generator and said input terminal connected to said second modulating voltage source, and k. an anticoincidence circuit having a first input connected to the oUtput of said first monostable multivibrator and a second input connected to the output of said second monostable multivibrator, said anticoincidence circuit having an output pulse whose duration is proportional to the ratio V1/V2.