Noise discrimination apparatus

Claim 2

Noise discrimination apparatus comprising: first means for producing a first bilevel signal, P, of a predetermined phase and of a predetermined frequency; second means actuable synchronously with said first means to produce a second bilevel signal, Q, of a frequency which is approximately the same as that of said first signal; a flip-flop having a set input and a reset input; first and second inverters having inputs connected from the outputs of said first and second means, respectively, to receive said first and second signals, respectively; and first and second AND gates, each of said AND gates having first and second inputs and an output, the first and second inputs of said first AND gate being connected from said first and second means, respectively, the first and second inputs of said second AND gate being connected from the outputs of said first and second inverters, respectively, the output of said first AND gate being connected to the set input of said flip-flop, the output of said second AND gate being connected to the reset input of said flip-flop.

Claim 3

The invention as defined in claim 1, wherein the phase of said second signal is approximately the same as that of said first signal.

Claim 4

Noise discrimination apparatus comprising: first means for producing a first bilevel signal, P, of a predetermined phase and of a predetermined frequency; second means actuable synchronously with said first means to produce a second bilevel signal, Q, of a frequency which is the same as that of said first signal; a flip-flop having a set input and a reset input; first and second inverters connected from the outputs of said first and second means, respectively, to receive said first and second signals, respectively; and first and second AND gates, each of said AND gates having first and second inputs and an output, the first inputS of said first and second AND gates being connected from said first and second means, respectively, the second inputs of said first and second AND gates being connected from the outputs of said second and first inverters, respectively, the output of said first AND gate being connected to the set input of said flip-flop, the output of said second AND gate being connected to the reset input of said flip-flop.

Claim 5

Noise discrimination apparatus comprising: first means for producing a first bilevel signal, P, of a predetermined phase and of a predetermined frequency; second means actuable synchronously with said first means to produce a second bilevel signal, Q, of a frequency which is the same as that of said first signal; a flip-flop having a set input and a reset input; first and second inverters connected from the outputs of said first and second means, respectively, to receive said first and second signals, respectively; and first and second AND gates, each of said AND gates having first and second inputs and an output, the first inputS of said first and second AND gates being connected from said first and second means, respectively, the second inputs of said first and second AND gates being connected from the outputs of said second and first inverters, respectively, the output of said first AND gate being connected to the set input of said flip-flop, the output of said second AND gate being connected to the reset input of said flip-flop.

Claim 6

The invention as defined in claim 3, wherein said second signal is approximately 180 degrees out of phase with said first signal.

Claim 7

Apparatus for producing pulses at a repetition rate directly proportional to angular velocity, said apparatus comprising: a base; first and second magnetic pick-ups mounted in a fixed position relative to said base; a movable member rotatably mounted on said base about a first axis; a ferromagnetic armature fixed relative to said movable member in a position to move therewith contiguously past said pick-ups, said armature having a plurality of equally and angularly spaced teeth separated by valleys, all of said teeth being located a predetermined distance from the rotational axis of said armature, said first and second pick-ups including first and second permanent magnets, respectively, the axes of said magnets through the poles thereof being approximately parallel to each other and to said first axis, said teeth projecting toward said magnets in a direction approximately parallel to said first axis, said first and second magnets having first and second coils therearound, the poles of said magnets closest to said teeth being spaced apart in the direction of movement thereof a distance approximately equal to nd, where n is any positive odd integer and d is one-half the distance between any two immediately adjacent teeth, first means connected from said first coil to develop a first periodic bilevel signal P responsive to, and in synchronism with, movement of said teeth and said valleys past said first magnet; second means connected from said second coil to develop a second periodic bilevel signal Q responsive to, and in synchronism with, movement of said teeth having inputs and said valleys past said second magnet, said first and second signals having the same frequency; a flip-flop having a set input and a reset input; first and second inverters having inputs connected from the outputs of said first and second means, respectively, to receive said first and second bilevel signals, respectively; said first and second AND gates, each of said AND gates having first and second inputs and an output, the first and second inputs of said first AND gate being connected from said first and second means, respectively, the first and second inputs of said second AND gate being connected from the outputs of said first and second inverters, respectively, the output of said first AND gate being connected to the set input of said flip-flop, the output of said second AND gate being connected to the reset input of said flip-flop.

Claim 8

Apparatus for producing pulses at a repetition rate directly proportional to angular velocity, said apparatus comprising: a base; first and second magnetic pick-ups mounted in a fixed position relative to said base; a movable member rotatably mounted on said base about a first axis; a ferromagnetic armature fixed relative to said movable member in a position to move therewith contiguously past said pick-ups, said armature having a plurality of equally and angularly spaced teeth separated by valleys, all of said teeth being located a predetermined distance from the rotational axis of said armature, said first and second pick-ups including first and second permanent magnets, respectively, the axes of said magnets through the poles thereof being approximately parallel to each other and to said first axis, said teeth projecting toward said magnets in a direction approximately parallel to said first axis, said first and second magnets having first and second coils therearound, the poles of said magnets closest to said teeth being spaced apart in the direction of movement thereof a distance approximately equal to nd, where n is any positive odd integer and d is one-half the distance between any two immediately adjacent teeth, first means connected from said first coil to develop a first periodic bilevel signal P responsive to, and in synchronism with, movement of said teeth and said valleys past said first magnet; second means connected from said second coil to develop a second periodic bilevel signal Q responsive to, and in synchronism with, movement of said teeth having inputs and said valleys past said second magnet, said first and second signals having the same frequency; a flip-flop having a set input and a reset input; first and second inverters having inputs connected from the outputs of said first and second means, respectively, to receive said first and second bilevel signals, respectively; said first and second AND gates, each of said AND gates having first and second inputs and an output, the first and second inputs of said first AND gate being connected from said first and second means, respectively, the first and second inputs of said second AND gate being connected from the outputs of said first and second inverters, respectively, the output of said first AND gate being connected to the set input of said flip-flop, the output of said second AND gate being connected to the reset input of said flip-flop.

Claim 9

The invention as defined in claim 5, wherein the phase of said second signal is approximately the same as that of said first signal.

Claim 10

The invention as defined in claim 6, wherein the same type of pole of each magnet is positioned to have said armature pass contiguous thereto.

Claim 11

The invention as defined in claim 7, wherein said first means includes a first inverting amplifier having its input connected from one end of said first coil and its output connected to the input of said first inverter and to said first AND gate first input, a first diode connected from said first amplifier output to ground and poled in a direction away from ground, said second means including a second inverting amplifier having its input connected from one end of said second coil corresponding to said first coil one end, said second amplifier having its output connected to the input of said second inverter and to said first AND gate second input, a second diode connected from said second amplIfier output to ground and poled in a direction away from ground, the other ends of said coils being connected to ground, both of said coils being wound in substantially the same way and in the same direction around the respective magnets, both of said magnets being of substantially the same size and shape, said magnets being longitudinally polarized bar-like magnets, each of said armature teeth having a width equal to the distance between two immediately adjacent pair of teeth, n being equal to unity.

Claim 12

The invention as defined in claim 8, wherein said bilevel signal frequency is f, given by the formula f (RN/60) where, f is in cycles per second, R is the angular velocity of said armature in revolutions per minute, and N is the total number of said teeth.

Claim 13

The invention as defined in claim 1, wherein the same type of pole of each magnet is positioned to have said armature pass contiguous thereto.

Claim 14

The invention as defined in claim 1, wherein said bilevel signal frequency is f, given by the formula f (RN/60) where, f is in cycles per second, R is the angular velocity of said armature in revolutions per minute, and N is the total number of said teeth.

Claim 15

Apparatus for producing pulses at a repetition rate directly proportional to angular velocity, said apparatus comprising: a base; first and second magnetic pick-ups mounted in a fixed position relative to said base; a movable member rotatably mounted on said base about a first axis; a ferromagnetic armature fixed relative to said movable member in a position to move therewith contiguously past said pick-ups, said armature having a plurality of equally and angularly spaced teeth separated by valleys, all of said teeth being located a predetermined distance from the rotational axis of said armature, said first and second pick-ups including first and second permanent magnets, respectively, the axes of said magnets through the poles thereof being approximately parallel to each other and to said first axis, said teeth projecting toward said magnets in a direction approximately parallel to said first axis, said first and second magnets having first and second coils therearound, the poles of said magnets closest to said teeth being spaced apart in the direction of movement thereof a distance approximately equal to nd, where n is any positive odd interger and d is one-half the distance between any two immediately adjacent teeth, first means connected from said first coil to develop a first periodic bilevel signal P responsive to movement of said teeth and said valleys past said first magnet; second means connected from said second coil to develop a second periodic bilevel signal Q responsive to and in synchronism with movement of said teeth and said valleys past said second magnet, said first and second signals having the same frequency; a flip-flop having a set input and a reset input; first and second inverters having inputs connected from the outputs of said first and second means, respectively, to receive said first and second bilevel signals, respectively; and first and second AND gates, each of said AND gates having first and second inputs and an output, the first inputs of said first and second AND gates being connected from said first and second means, respectively, the second inputs of said first and second AND gates being connected from the outputs of said second and first inverters, respectively, the output of said first AND gate being connected to the set input of said flip-flop, the output of said second AND gate being connected to the reset input of said flip-flop.

Claim 16

Apparatus for producing pulses at a repetition rate directly proportional to angular velocity, said apparatus comprising: a base; first and second magnetic pick-ups mounted in a fixed position relative to said base; a movable member rotatably mounted on said base about a first axis; a ferromagnetic armature fixed relative to said movable member in a position to move therewith contiguously past said pick-ups, said armature having a plurality of equally and angularly spaced teeth separated by valleys, all of said teeth being located a predetermined distance from the rotational axis of said armature, said first and second pick-ups including first and second permanent magnets, respectively, the axes of said magnets through the poles thereof being approximately parallel to each other and to said first axis, said teeth projecting toward said magnets in a direction approximately parallel to said first axis, said first and second magnets having first and second coils therearound, the poles of said magnets closest to said teeth being spaced apart in the direction of movement thereof a distance approximately equal to nd, where n is any positive odd interger and d is one-half the distance between any two immediately adjacent teeth, first means connected from said first coil to develop a first periodic bilevel signal P responsive to movement of said teeth and said valleys past said first magnet; second means connected from said second coil to develop a second periodic bilevel signal Q responsive to and in synchronism with movement of said teeth and said valleys past said second magnet, said first and second signals having the same frequency; a flip-flop having a set input and a reset input; first and second inverters having inputs connected from the outputs of said first and second means, respectively, to receive said first and second bilevel signals, respectively; and first and second AND gates, each of said AND gates having first and second inputs and an output, the first inputs of said first and second AND gates being connected from said first and second means, respectively, the second inputs of said first and second AND gates being connected from the outputs of said second and first inverters, respectively, the output of said first AND gate being connected to the set input of said flip-flop, the output of said second AND gate being connected to the reset input of said flip-flop.

Claim 17

The invention as defined in claim 12, wherein the phase of said second signal is approximately 180 degrees out of phase with said first signal.

Claim 18

The invention as defined in claim 13, wherein the same type of pole of each magnet is positionEd to have said armature pass contiguous thereto.

Claim 19

The invention as defined in claim 14, wherein said first means includes a first inverting amplifier having its input connected from one end of said first coil and its output connected to the input of said first inverter and to said first AND gate first input, a first diode connected from said first amplifier output to ground and poled in a direction away from ground, said second means including a second inverting amplifier having its input connected from one end of said second coil corresponding to said first coil one end, said second amplifier having its output connected to the input of said second inverter and to said second AND gate second input, a second diode connected from said second amplifier output to ground and poled in a direction away from ground, the other ends of said coils being connected to ground, both of said coils being wound in substantially the same way and in the same direction around the respective magnets, both of said magnets being of substantially the same size and shape, said magnets being longitudinally polarized bar-like magnets, each of said armature teeth having a width equal to the distance between two immediately adjacent pair of teeth, n being equal to unity.

Claim 20

The invention as defined in claim 15, wherein said bilevel signal frequency is f, given by the formula f (RN/60) where, f is the cycles per second, R is the angular velocity of said armature in revolutions per minute, and N is the total number of said teeth.

Claim 21

The invention as defined in claim 12, wherein the same type of pole of each magnet is positioned to have said armature pass contiguous thereto.

Claim 22

The invention as defined in claim 12, wherein said bilevel signal frequency is f, given by the formula f (RN/60) where, f is the cycles per second, R is the angular velocity of said armature in revolutions per minute, and N is the total number of said teeth.

Claim 23

Noise discrimination apparatus comprising: first means for producing a first bilevel signal, P, on an output lead thereof, of a predetermined phase and of a predetermined frequency; second means actuable synchronously with said first means to produce a second bilevel signal, Q, on an output lead thereof, of a frequency which is always the same as that of said first signal, the phase of said second signal being always the same as that of said first signal; an AND gate having first and second input leads; third means connected from said first means output lead to said first gate lead; and fourth means connected from said second means output lead to said second gate lead, said third and fourth means being constructed in a manner such that the logic of said AND gate is one of the logics PQ and PQ.

Claim 24

Noise discrimination apparatus comprising: first means for producing a first bilevel signal, P, on an output lead thereof, of a predetermined phase and of a predetermined frequency; second means actuable synchronously with said first means to produce a second bilevel signal, Q, on an output lead thereof, of a frequency which is always the same as that of said first signal, the phase of said second signal being always the same as that of said first signal; an AND gate having first and second input leads; third means connected from said first means output lead to said first gate lead; and fourth means connected from said second means output lead to said second gate lead, said third and fourth means being constructed in a manner such that the logic of said AND gate is one of the logics PQ and PQ.

Claim 25

Noise discrimination apparatus comprising: first means for producing a first bilevel signal, P, on an output lead thereof of a predetermined phase and of a predetermined frequency; second means actuable synchronously with said first means to produce a second bilevel signal, Q, on an output lead thereof of a frequency which is always the same as that of said first signal, said second signal always being 180 degrees out of phase with said first signal; an AND gate having first and second input leads; third means connected from said first means output lead to said first gate lead; and fourth means connected from said second means output lead to said second gate lead, said third and fourth means being constructed in a manner such that the logic of said AND gate is one of the logics PQ and PQ.

Claim 26

Noise discrimination apparatus comprising: first means for producing a first bilevel signal, P, on an output lead thereof of a predetermined phase and of a predetermined frequency; second means actuable synchronously with said first means to produce a second bilevel signal, Q, on an output lead thereof of a frequency which is always the same as that of said first signal, said second signal always being 180 degrees out of phase with said first signal; an AND gate having first and second input leads; third means connected from said first means output lead to said first gate lead; and fourth means connected from said second means output lead to said second gate lead, said third and fourth means being constructed in a manner such that the logic of said AND gate is one of the logics PQ and PQ.