Signal generator for unbalance detectors

Claim 2

In an apparatus for producing a triangular waveform signal 90* out of phase from a reference triangular wave, the combination comprising first means to produce an auxiliary signal by producing the reference trianGular wave during a first series of alternate 90* phase intervals of the reference wave and by inverting the reference triangular wave during a second series of alternate 90* phase intervals of the reference wave; means to generate a first square wave in phase with the reference triangular wave; and means to add the auxiliary signal and the first square wave; whereby the sum of the auxiliary signal and the first square wave is a second triangular waveform signal 90* out of phase from the reference triangular wave and having a frequency equal to the frequency of the reference triangular wave and a peak to peak amplitude equal to that of the reference triangular wave.

Claim 3

In a sine-cosine generator, the combination comprising means to generate a periodic pulse train whose frequency may vary; means to generate in response to the periodic pulse train a D.C. voltage having a magnitude which varies directly with the frequency of the periodic pulse train; integrating means having an input and an output to produce a first output signal; connecting means for supplying the D.C. voltage to said input; control means responsive to said first output signal and to the periodic pulse train to cause said connecting means to change the effective polarity with which the D.C. voltage is applied to said input at each instant that said first output signal reaches a predetermined level and at each instant one of the pulses in the periodic pulse train appears; means to produce an auxiliary signal by reproducing said first output signal during a first series of alternate 90* phase intervals of the first output signal and by inverting the first output signal during a second series of alternate 90* phase intervals of the first output signal; means to generate a first square wave in phase with said first output signal; and means to add the auxiliary signal and the first square wave to produce a second output signal; whereby the first output signal is a first triangular wave with its frequency equal to the frequency of the periodic pulse train and having a constant amplitude and a fixed phase relationship with the periodic pulse train, and the second output signal is a second triangular wave with its frequency equal to the frequency of the periodic pulse train and having a constant amplitude and being 90* out of phase from the first triangular wave.

Claim 4

In a sine-cosine generator, the combination comprising means to generate a periodic pulse train whose frequency may vary; means to generate in response to the periodic pulse train a D.C. voltage having a magnitude which varies directly with the frequency of the periodic pulse train; integrating means having an input and an output to produce a first output signal; connecting means for supplying the D.C. voltage to said input; control means responsive to said first output signal and to the periodic pulse train to cause said connecting means to change the effective polarity with which the D.C. voltage is applied to said input at each instant that said first output signal reaches a predetermined level and at each instant one of the pulses in the periodic pulse train appears; means to produce an auxiliary signal by reproducing said first output signal during a first series of alternate 90* phase intervals of the first output signal and by inverting the first output signal during a second series of alternate 90* phase intervals of the first output signal; means to generate a first square wave in phase with said first output signal; and means to add the auxiliary signal and the first square wave to produce a second output signal; whereby the first output signal is a first triangular wave with its frequency equal to the frequency of the periodic pulse train and having a constant amplitude and a fixed phase relationship with the periodic pulse train, and the second output signal is a second triangular wave with its frequency equal to the frequency of the periodic pulse train and having a constant amplitude and being 90* out of phase from the first triangular wave.

Claim 5

The combination set forth in claim 2 further comprising first wave forming means to convert the first output signal into a first constant amplitude sinusoidal waveform in phase with the first output signal; and second wave forming means to convert the second output signal into a second constant amplitude sinusoidal waveform in phase with the second output signal; whereby the first constant amplitude sinusoidal waveform and the second constant amplitude sinusoidal waveform have frequencies equal to the frequency of the periodic pulse train and are 90* out of phase with respect to each other.

Claim 6

In an apparatus for producing a periodic, constant amplitude triangular waveform signal in fixed phase relationship to a cyclically recurring event which may vary in frequency, the combination comprising, first means to detect the cyclically recurring event and to produce a train of pulses, each pulse corresponding to an event occurrence; second means connected to receive the train of pulses and to produce a dc. voltage which in magnitude is indicative of the frequency of such pulses, said second means including a. means to generate a first pulse signal with a predetermined pulse width and a predetermined amplitude and having its frequency equal to that of said pulse train, b. means to generate a second pulse signal with said predetermined pulse width and amplitude but shifted substantially 180* out of phase from the first pulse signal, c. means to combine said first and sEcond pulse signals to produce a third pulse signal having twice the frequency of said first and second pulse signals, and d. means to average the third pulse signal to generate the dc. voltage, whereby ripple is substantially decreased in the dc. voltage and any that does exist in symmetrical about a point 180* displaced from each pulse in said train of pulses, integrating means having an input and an output; connecting means for supplying the dc. voltage to said input; and control means responsive to the output signal at said output of said integrating means and to the train of pulses to cause said connecting means to change the effective polarity with which the dc. voltage is applied to said input of said integrating means at each instant that the first output signal reaches a predetermined level and at each instant one of the pulses in the pulse train appears; whereby the output signal is of triangular waveform having a frequency equal to the frequency of occurrence of the recurring event, a fixed phase relationship with the recurring event, and a constant amplitude independent of the frequency of occurrence of the recurring event.

Claim 7

In an apparatus for producing a periodic, constant amplitude triangular waveform signal in fixed phase relationship to a cyclically recurring event which may vary in frequency, the combination comprising, first means to detect the cyclically recurring event and to produce a train of pulses, each pulse corresponding to an event occurrence; second means connected to receive the train of pulses and to produce a dc. voltage which in magnitude is indicative of the frequency of such pulses, said second means including a. means to generate a first pulse signal with a predetermined pulse width and a predetermined amplitude and having its frequency equal to that of said pulse train, b. means to generate a second pulse signal with said predetermined pulse width and amplitude but shifted substantially 180* out of phase from the first pulse signal, c. means to combine said first and sEcond pulse signals to produce a third pulse signal having twice the frequency of said first and second pulse signals, and d. means to average the third pulse signal to generate the dc. voltage, whereby ripple is substantially decreased in the dc. voltage and any that does exist in symmetrical about a point 180* displaced from each pulse in said train of pulses, integrating means having an input and an output; connecting means for supplying the dc. voltage to said input; and control means responsive to the output signal at said output of said integrating means and to the train of pulses to cause said connecting means to change the effective polarity with which the dc. voltage is applied to said input of said integrating means at each instant that the first output signal reaches a predetermined level and at each instant one of the pulses in the pulse train appears; whereby the output signal is of triangular waveform having a frequency equal to the frequency of occurrence of the recurring event, a fixed phase relationship with the recurring event, and a constant amplitude independent of the frequency of occurrence of the recurring event.

Claim 10

In an apparatus for producing a triangular waveform signal 90* out of phase from a reference triangular wave, the combination comprising first pulse generator means to produce a first pulse train in phase with the reference triangular wave and a second pulse train 180* out of phase from the reference triangular wave; means to combine the first and second pulse trains to produce a third pulse train; a second pulse generator means to produce a fourth pulse train 180* out of phase from the third pulse train; a first bistate device switchable to a first state by the fourth pulse train to produce a first control signal and to a second state by the third pulse train to produce a second control signal; switching means connected to receive the reference triangular wave at its input; said switching means being responsive to the first and second control signals to produce at its output an auxiliary signal which is (a) the reference triangular wave during the first series of alternate 90* phase intervals of the reference wave and (b) the inversion of the reference triangular wave during the second series of alternate 90* phase intervals of the reference wave, means to generate a first square wave in phase with the reference triangular wave; and means to add the auxiliary signal and the first square wave; whereby tHe sum of the auxiliary signal and the first square wave is a second triangular waveform signal 90* out of phase from the reference triangular wave and a peak to peak amplitude equal to that of the reference triangular wave.

Claim 11

In an apparatus for producing a triangular waveform signal 90* out of phase from a reference triangular wave, the combination comprising first pulse generator means to produce a first pulse train in phase with the reference triangular wave and a second pulse train 180* out of phase from the reference triangular wave; means to combine the first and second pulse trains to produce a third pulse train; a second pulse generator means to produce a fourth pulse train 180* out of phase from the third pulse train; a first bistate device switchable to a first state by the fourth pulse train to produce a first control signal and to a second state by the third pulse train to produce a second control signal; switching means connected to receive the reference triangular wave at its input; said switching means being responsive to the first and second control signals to produce at its output an auxiliary signal which is (a) the reference triangular wave during the first series of alternate 90* phase intervals of the reference wave and (b) the inversion of the reference triangular wave during the second series of alternate 90* phase intervals of the reference wave, means to generate a first square wave in phase with the reference triangular wave; and means to add the auxiliary signal and the first square wave; whereby tHe sum of the auxiliary signal and the first square wave is a second triangular waveform signal 90* out of phase from the reference triangular wave and a peak to peak amplitude equal to that of the reference triangular wave.

Claim 12

The combination set forth in claim 6 wherein said second pulse generator means comprises third means to convert the reference triangular wave into a second squarewave having its crossover points in phase with the crossover points of the reference triangular wave; and pulse doubler means responsive to the second squarewave for producing the fourth pulse signal.

Claim 13

In apparatus for producing a periodic, constant amplitude triangular waveform signal in fixed phase relationship to a cyclically recurring event which may vary in frequency, the combination comprising first means to produce a train of pulses with each pulse therein substantially in time coincidence with one of said event occurrences; second means connected to receive said train of pulses and to produce a D.C. voltage, the magnitude of which is indicative of the frequency of said pulse train; means including an integrating operational amplifier having inverting (-) and non-inverting (+) input terminals, together with an output terminal; and control means responsive to the output signal at said output terminal and to said train of pulses for (a) switching said D.C. voltage to one of said input terminals in response to said output signal reaching a predetermined magnitude, and (b) switching said D.C. voltage to the other of said input terminals in response to the appearance of a pulse in said pulse train; whereby said output signal is of triangular waveform having a frequency equal to the frequency of the recurring event, a fixed phase relationship to the recurring event, and a constant amplitude independent of the frequency of the recurring event.

Claim 14

In apparatus for producing a periodic, constant amplitude triangular waveform signal in fixed phase relationship to a cyclically recurring event which may vary in frequency, the combination comprising first means to produce a train of pulses with each pulse therein substantially in time coincidence with one of said event occurrences; second means connected to receive said train of pulses and to produce a D.C. voltage, the magnitude of which is indicative of the frequency of said pulse train; means including an integrating operational amplifier having inverting (-) and non-inverting (+) input terminals, together with an output terminal; and control means responsive to the output signal at said output terminal and to said train of pulses for (a) switching said D.C. voltage to one of said input terminals in response to said output signal reaching a predetermined magnitude, and (b) switching said D.C. voltage to the other of said input terminals in response to the appearance of a pulse in said pulse train; whereby said output signal is of triangular waveform having a frequency equal to the frequency of the recurring event, a fixed phase relationship to the recurring event, and a constant amplitude independent of the frequency of the recurring event.