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US 4,063,107 AGranted
Method and apparatus for producing interference-free pulses
OwnerGunter Hartiginventor
Life of this patent
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Abstract
The invention is concerned with producing interference-free (square) pulses with clean leading and trailing edges, from a pulse generator subject to vibration. This is effected by producing two interference-affected pulse trains of the same frequency but different phase, and applying them to a back-coupled gate circuit the output of which is turned "on" by the first interfering pulse of a first pulse train corresponding in time to an interference-free region of the second pulse train, and stays "on" until the end of the said interference free region, irrespective of any further interference in the first pulse sequence. The action is also repeated in reverse.
Claims20
Method of inductively producing interference-free electrical pulses comprising the following steps:
- a. strengthening or weakening periodically the flux of a magnetic field within a gap by moving past or through said magnetic field a member of a material which is able to strengthen or weaken a magnetic field,
- b. modulating said magnetic field within said gap with a carrier frequency voltage,
- c. inducing a voltage in each of at least two induction elements by said magnetic field so that said voltage in each of said induction elements has a frequency being identical with said carrier frequency and has an amount which varies according to the variations of said magnetic field caused by said member, said voltages further being phase shifted relative to each other due to spatial displacement of said two induction elements relative to each other in the direction of the movement of said member,
- d. comparing the phase of the voltage difference of said two voltages with the phase of said carrier frequency voltage so that there are by phase sorting obtained two pulse sequences which are synchronized relative to each other such that the interference-affected regions of one of said pulse sequences occur at the same time as interference-free regions of the other of said pulse sequences, and vice versa,
- e. and controlling by said pulse sequences the level of an output value which is variable between two levels, said controlling is made such that the first change of level in an interference-affected region of one of said pulse sequences which takes place during an interference-free region of the other of said pulse sequences effects a change in the level of that output value, and said changed output value is maintained during the interference-free region of said other pulse sequence irrespectively of other changes of level in the interference-affected region of said one pulse sequence, and vice versa.
2 more elements
Apparatus for inductively producing interference-free electrical pulses comprising:
- a. a pulse generator having a mechanically driven member which is able to strengthen or to weaken periodically a magnetic field,
- b. at least one pick-up head having a gap with a magnetic field the flux of which is strengthened or weakened periodically by said member,
- c. a device for modulating the magnetic field within said gap with a carrier frequency,
- d. at least two induction elements in said pick-up head, said induction elements being arranged within said magnetic field so that a voltage is inducted in each of said induction elements having a frequency being identical with said carrier frequency and having an amount varying according to the variations of said magnetic field caused by said member, said induction elements being further displaced relative to each other in the direction of the movement of said member so that said voltage being produced in one of said induction elements is phase shifted relative to said voltage being produced in the other of said induction elements,
- e. a device for phase comparison between the phase of the voltage difference of the voltages produced in said induction elements and the phase of the voltage of said modulating device so that there are by phase sorting obtained at least two pulse sequences which are synchronized relative to each other such that the interference-affected regions of one of said pulse sequences are occurring at the same time as interference-free regions of the other of said pulse sequences, and vice versa,
- f. and a control device having an input for each of said pulse sequences and an output the value of which is variable between two levels, said control device being controlled by said pulse sequences such that the first change of level in the interference-affected region of one of said pulse sequences which takes place during an interference-free region of the other of said pulse sequences effects a change in the level of said output value, and said changed output value is maintained during the interference-free region of said other pulse sequence irrespectively of other changes of level in the interference-affected region of said one pulse sequence, and vice versa.
3 more elements
Dependencies are inferred from the claim text.