US3697703A
Expired / Lapsed
US
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Signal processing utilizing basic functions
Assignee: MELVILLE CLARK ASSOCIATES
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Filing: 1969-08-15
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Granted: 1972-10-10
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Expires: 1989-08-15
Abstract
Abstract The present invention relates to the analysis and synthesis of complex time-varying signals over a wide range of frequencies and amplitudes in terms of selectable sets of expansion functions. Analysis consists of gating a time-sampled representation of the input signal stored on capacitors, into resistor matrices, which compute other desired representations. Use of the Fourier series representation in the analysis produces Fourier phazor components, which are converted to resultant vector amplitudes and phases by carrier generation through modulation by the phazors of 90*-out-of-phase, very high frequency, reference oscillators. Synchronous carrier demodulation gives resultant Fourier amplitudes. Carrier phase, relative to one of the reference oscillators, being equal to the Fourier phase, is determined by time (between zero crossings)-to-voltage conversion. Analyzer tuning may be external, voltage-controlled, or phase-controlled. When tuning is phase controlled, phase computing circuits lock the analyzer frequency to that of the input signal. The analysis bandwidth may be absolute- or voltagecontrolled fractional, the latter being achieved by a variableduty-cycle time-sampling-filter method. Frequency-tracking-system control of the voltage for controlled fractional bandwidth gives the ability to analyze with narrow bandwidth while providing wide band frequency tracking. A slowly varying phase-time derivative, when present for an appropriate length of time, is used to test for input signal coherence. The test result is used to control frequency tracking to prevent erratic tuning during attempted frequency tracking of incoherent signals. Relative phase values over a range greater than the normal range of 2 pi radians are made possible by sensing the traversals of the phase cut. For synthesis, control signals are generated and applied to a transformation matrix which, via multiplexing of the matrix outputs gives the sequential representation of a signal. Curves used to derive control signals, on film are read at high speed using a flying spot scanner. Spot intensity differentiation with zero crossing detection gives extremely high accuracy independent of spot intensity. Fourier log or linear amplitude and phase curve values are serially converted to phazor components synchronously with scanning by gated excitation and gated dissipation of high Q LC resonant circuits. Appropriate final stage gating and filtering of the time-sample representation eliminates system transients and objectionable frequency components due to the quantization of the output signal.
Inventors
- 👤 Melville Clark Jr
- 👤 David A Luce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:50
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/1921; G01; G01R; G01R23/00
Claims Analysis
Total Claims: 58
Claim 1
Independent Claim
114 words
Signal processing apparatus comprising, means for receiving a signal to be analyzed having values as a function of time, a plurality of storage means for storing respective time-spaced values of the signal to be analyzed, means for sequEntially coupling respective ones of said storage means to said means for receiving to store said time-spaced values, transformation matrix means having output means and a number of inputs corresponding to said plurality for converting each of said time-spaced values in a predetermined manner to an output signal on said output means characteristic of the signal to be analyzed, and means for coupling each of said storage means to a respective one of said transformation matrix inputs.
Claim 2
Dependent Claim
114 words
Signal processing apparatus comprising, means for receiving a signal to be analyzed having values as a function of time, a plurality of storage means for storing respective time-spaced values of the signal to be analyzed, means for sequEntially coupling respective ones of said storage means to said means for receiving to store said time-spaced values, transformation matrix means having output means and a number of inputs corresponding to said plurality for converting each of said time-spaced values in a predetermined manner to an output signal on said output means characteristic of the signal to be analyzed, and means for coupling each of said storage means to a respective one of said transformation matrix inputs.
Claim 3
Dependent Claim
41 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix means includes means responsive to said time-spaced values for providing said output signal with values representative of respective coefficients of basis signal components of the signal to be analyzed.
Claim 4
Dependent Claim
96 words
Signal processing apparatus in accordance with claim 2 and further comprising, a plurality of synthesizer storage means for storing respective ones of said output signal values, synthesizer transformation matrix means having output means and a number of inputs corresponding to said plurality of synthesizer storage means for converting each of said stored output signal values in a predetermined manner to an output signal on said last-mentioned output means characterized by said stored output signal values, and means for coupling each of said synthesizer storage means to a respective one of said synthesizer transformation matrix means inputs.
Claim 5
Dependent Claim
43 words
Signal processing apparatus in accordance with claim 3 and further comprising output processing means coupled to said last-mentioned output means for providing a synthesized output signal that is a continuous function of time having a waveform characterized by said stored output signal values.
Claim 6
Dependent Claim
100 words
Signal processing apparatus in accordance with claim 1 wherein each of said storage means is a capacitor, said means for sequentially coupling comprises a number of distribution gates corresponding to said plurality with the inputs of each of said distribution gates coupled to said means for receiving and the output of each distribution gate coupled to a respective capacitor, a source of a variable frequency control signal, and analyzer control logic means responsive to said variable frequency control signal for providing distribution gating signals to said distribution gates for sequentially closing the latter distribution gates during mutually exclusive time intervals.
Claim 7
Dependent Claim
101 words
Signal processing apparatus in accordance with claim 5 wherein said means for coupling each of said storage means to a respective one of said transformation matrix inputs comprises a number of transformation gates corresponding to said plurality with each transformation gate coupling a respective one of said capacitors to a respective transformation matrix input means, said analyzer control logic means being responsive to said variable frequency control signal for providing transformation gating signals to said transformation gates for closing said transformation gates during selected time intervals that are much shorter than the time interval in which said transformation gates are open.
Claim 8
Dependent Claim
123 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix means includes means responsive to said time-spaced values for providing said output signal with values representative of respective coefficients of basis signal components of the signal to be analyzed and each of said storage means is a capacitor and further comprising, a transformation matrix output gate for each of said output values, a source of a variable frequency control signal, and analyzer control logic means responsive to said variable frequency control signal for providing transformation matrix output gating signals to said transformation matrix output gates for closing said transformation matrix output gates during selected time intervals that are much shorter than the time interval in which the latter gates are open.
Claim 9
Dependent Claim
93 words
Signal processiNg apparatus in accordance with claim 7 wherein said means for sequentially coupling comprises a number of distribution gates corresponding to said plurality with the inputs of each of said distribution gates coupled to said means for receiving and the output of each distribution gate coupled to a respective capacitor, said source of a variable frequency control signal, and said analyzer control logic means responsive to said variable frequency control signal for providing distribution gating signals to said distribution gates for sequentially closing the latter distribution gates during mutually exclusive time intervals.
Claim 10
Dependent Claim
101 words
Signal processing apparatus in accordance with claim 8 wherein said means for coupling each of said storage means to a respective one of said transformation matrix inputs comprises a number of transformation gates corresponding to said plurality with each transformation gate coupling a respective one of said capacitors to a respective transformation matrix input means, said analyzer control logic means being responsive to said variable frequency control signal for providing transformation gating signals to said transformation gates for closing said transformation gates during selected time intervals that are much shorter than the time interval in which said transformation gates are open.
Claim 11
Dependent Claim
118 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix means comprises a first matrix with a first half of said inputs and a second matrix with a second half of said inputs and said means for coupling each of said storage means comprises means for coupling alternate ones of said storage means to a respective one of said first matrix inputs and means for coupling the remaining ones of said storage means to said second matrix inputs whereby interleaved time samples are delivered to said first and second matrices, and switching means for changing the signs of signals transmitted by said first matrix relative to the signs of the signals transmitted by said second matrix.
Claim 12
Dependent Claim
16 words
Signal processing apparatus in accordance with claim 10 wherein said switching means is a foldover switch.
Claim 13
Dependent Claim
107 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix means includes means responsive to said time-spaced values for providing said output signal with values representative of respective coefficients of basis signal components of the signal to be analyzed and further comprising a source of a carrier signal, and means responsive to said carrier signal and said output signal with values representative of respective coefficients of basis signal components of the signal being analyzed for providing an output phase signal representative of the difference in time between zero crossings of said carrier signal and zero crossings of a spectral components related to said output signal.
Claim 14
Dependent Claim
224 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix means includes means responsive to said time-spaced values for providing said output signal with values representative of respective coefficients of basis signal components of the signal to be analyzed and further comprising, a source of first and second carrier signals of fixed frequency in time quadrature, first modulating means for modulating said first carrier signal with said output signal having values representative of representative coefficients of basis signal components of the signal to be analyzed to provide a first modulated output signal, second modulating means for modulating said second carrier signal with said output signal having values to provide a second modulated output signal, means for combining said first and second modulated output signals to provide a summed modulated signal, a bandpass filter energized by said summed modulated signal for transmitting a predetermined band of spectral components about said fixed frequency to provide a resultant carrier signal, means responsive tO each zero crossing of said resultant carrier signal for providing a strobe pulse, an amplitude storage means, means including a strobe gate coupling said resultant carrier signal to said amplitude storage means, and means for coupling the latter strobe pulses to said strobe gate for opening said strobe gate for a short time interval embracing each peak of said resultant carrier signal.
Claim 15
Dependent Claim
125 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix means includes means responsive to said time-spaced values for providing said output signal with values representative of respective coefficients of basis signal components of the signal to be analyzed and further comprising, a source of a reference signal, detecting means responsive to said output signal having values for providing a phase signal representative of the phase of a spectral component of the signal to be analyzed relative to that of said reference signal, and means responsive to said phase signal and said reference signal for providing a phase cut signal representative of a small phase range embracing said phase of a spectral component, said small phase range being much less than 360* .
Claim 16
Dependent Claim
175 words
Signal processing apparatus in accordance with claim 14 wherein said means responsive comprises, an AND gate energized by said phase signal and said reference signal one inverted with respect to the other to provide a trigger pulse when the latter two signals partially overlap, a phase cut overlap univibrator responsive to the latter trigger pulse for then providing an overlap pulse of predetermined duration, an OR gate energized by said phase signal and said reference signal one inverted with respect to the other and said overlap pulse inverted for providing a set pulse, a source of a static OFF signal, a shift register having at least first and second elements, a serial input energized by said static OFF signal, a shift input for receiving shift pulses, and a set input associated with said first element for receiving said set pulse to set said first element, and an information shift delay univibrator responsive to said phase signal for providing shift pulses of predetermined duration that are coupled to said shift input for shifting said shift register.
Claim 17
Dependent Claim
110 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix means includes means responsive to said time-spaced values for providing said output signal with values representative of respective coefficients of basis signal components of the signal to be analyzed and further comprising, detecting means responsive to said output signal having values for providing a frequency signal representative of the frequency of a spectral component of the signal to be analyzed, a source of a center frequency signal, and means responsive to said frequency signal and said center frequency signal for providing a coherence signal when the magnitude of said frequency signal is less than a predetermined time duration.
Claim 18
Dependent Claim
110 words
Signal processing apparatus in accordance with claim 16 wherein said means responsive to said frequency signal and said center frequency signal comprises, a runup capacitor, means responsive to said center frequency signal for charging said runup capacitor to a predetermined completion potential when said magnitude is less than said predetermined value for said predetermined time, means responsive to each attainment of said completion potential for providing a coherent pulse and returning said capacitor to a predetermined initial potential, and means responsive to said magnitude being more than said predetermined value for said predetermined time during returning said runup capacitor to said predetermined initial potential before said completion potential is attained.
Claim 19
Dependent Claim
60 words
Signal processing apparatus in accordance with claim 17 and further comprising, first and second voltage contrOlled univibrators responsive to alternate ones of said coherent pulses respectively for providing time overlapping output pulses of duration controlled by said center frequency signal, and an OR gate energized by said overlapping pulses for providing a coherent control signal for the duration of coherence.
Claim 20
Dependent Claim
95 words
Signal processing apparatus in accordance with claim 1 wherein said means for coupling includes frequency selective apparatus having an input, an output, at least one energy storage element between said input and said output, gating means coupled to said energy storage element, a source of a variable duty cycle gating signal, and means for coupling said variable duty cycle gating signal to said gating means whereby the frequency response characteristic between said input and said output of said frequency selective apparatus is related to the ratio of closed to open time of said gating means.
Claim 21
Dependent Claim
30 words
Signal processing apparatus in accordance with claim 19 wherein said energy storage element is a shunt capacitor and said gating means is in series between said input and said output.
Claim 22
Dependent Claim
30 words
Signal processing apparatus in accordance with claim 19 wherein said energy storage element is in series between said input and said output and said gating means is a shunt gate.
Claim 23
Dependent Claim
147 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix means includes means responsive to said time-spaced values for providing said output signal with values representative of respective coefficients of basis signal components of the signal to be analyzed and further comprising a period divider for dividing a time interval on the basis of the duration of a previous time interval, said period divider comprising, a source of a previous ramp signal that commenced at the beginning of said previous time interval, a source of a present ramp signal that changes at a rate greater than that of said previous ramp signal whereby said present and previous ramp signals reach equality in said present time interval, and means for comparing said previous ramp signal with said present ramp signal to provide a dividing pulse upon said equality to identify a division of said present interval.
Claim 24
Dependent Claim
162 words
Signal processing apparatus in accordance with claim 1 wherein said means for coupling includes frequency selective apparatus having an input, an output, at least one energy storage element between said input and said output, gating means coupled to said energy storage element, a source of a variable duty cycle gating signal, and means for coupling said variable duty cycle gating signal to said gating means whereby the frequency response characteristic between said input and said output of said frequency selective apparatus is related to the ratio of closed to open time of said gating means and said source of a variable duty cycle gating signal comprises, a source of a bandwidth control signal, a source of a variable frequency signal, and means responsive to said variable frequency signal and said bandwidth control signal for providing said variable duty cycle signal as a train of pulses of frequency determined by said variable frequency signal and of duration determined by said bandwidth control signal.
Claim 25
Dependent Claim
106 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix means includes means responsive to said time-spaced values for providing said output signal with values representative of respective coefficients of basis signal components of the signal to be analyzed and further comprising, detecting means responsive to said output signal having values for providing a phase signal representative of the phase of a spectral component of the signal to be analyzed, a source of a reference signal, and means for differentiating said phase signal to provide a phase difference that is representative of the difference in frequency between said spectral component and said reference signal.
Claim 26
Dependent Claim
129 words
Signal proceSsing apparatus in accordance with claim 24 wherein said means for differentiating said phase signal comprises a first storage capacitor for storing a first potential representative of a first time interval between a first and second zero crossings of said phase signal, a second storage capacitor for storing a second potential representative of a second time interval between phase signal zero crossings different from said first time interval, means for successively transferring the potential on said first storage capacitor to said second storage capacitor and then providing said first storage capacitor with a new first potential representative of a new first time interval, and means for differentially combining the signals on said first and second storage capacitors to provide a frequency signal representative of said difference in frequency.
Claim 27
Dependent Claim
123 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix means includes means responsive to said time-spaced values for providing said output signal with values representative of respective coefficients of basis signal components of the signal to be analyzed and further comprising, a source of a carrier signal, means responsive to said carrier signal and said output signal with values representative of respective coefficients of basis signal components of the signal being analyzed for providing an output phase signal representative of the difference in time between zero crossings of said carrier signal and zero crossings of a spectral component related to said output signal, and a voltage controlled oscillator responsive to said output phase signal for providing a frequency tracking signal.
Claim 28
Dependent Claim
100 words
Signal processing apparatus in accordance with claim 26 and further comprising, detecting means responsive to said output signal having values for providing a frequency signal representative of the frequency of a spectral component of the signal to be analyzed, a source of a center frequency signal, means responsive to said frequency signal and said center frequency signal for providing a coherence signal when the magnitude of said frequency signal is less than a predetermined value for a predetermined duration, said voltage controlled oscillator providing a frequency tracking signal in response to both said output phase signal and said coherence signal.
Claim 29
Dependent Claim
145 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix means comprises a first matrix with a first half of said inputs and a second matrix with a second half of said inputs and said means for coupling each of said storage means comprises means for coupling alternate ones of said storage means to a respective one of said first matrix inputs and means for coupling the remaining ones of said storage means to said second matrix inputs whereby interleaved time samples are delivered to said first and second matrices, switching means for changing the signs of signals transmitted by said first matrix relative to the signs of the signals transmitted by said second matrix and said means for coupling each of said storage means comprises, a period divider comprising means for providing alternate time samples to said first and second matrix means.
Claim 30
Dependent Claim
99 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix means includes means responsive to said time-spaced values for providing said output signal with values representative of respective coefficients of basis signal components of the signal to be analyzed and further comprising, means for heterodyning the input signal to be analyzed up in frequency to provide a translated input signal with spectral components centered about a predetermined center frequency, and signal sideband filtering means responsive to said translated input signal for transmitting only those of the latter spectral components on one side of said predetermined center frequency.
Claim 31
Dependent Claim
77 words
Signal processing apparAtus in accordance with claim 1 wherein said transformation matrix means includes means responsive to said time-spaced values for providing said output signal with values representative of respective coefficients of basis signal components of the signal to be analyzed and further comprising, means for attenuating high frequency components of the input signal to be analyzed that would otherwise be folded back into the frequency range of said signal processing apparatus by the sequential coupling process.
Claim 32
Dependent Claim
188 words
Signal processing apparatus in accordance with claim 1 wherein said means for coupling includes frequency selective apparatus having an input, an output, at least one energy storage element between said input and said output, gating means coupled to said energy storage element, a source of a variable duty cycle gating signal, and means for coupling said variable duty cycle gating signal to said gating means whereby the frequency response characteristic between said input and said output of said frequency selective apparatus is related to the ratio of closed to open time of said gating means and, detecting means responsive to said output signal having values for providing a phase signal representative of the phase of a spectral component of the signal to be analyzed, a source of a reference signal, means responsive to said reference signal and said phase signal for determining the difference between successive samples of said phase signal to provide a phase difference signal that is representative of the difference in frequency between said spectral component and said reference signal, and means responsive to said phase difference signal for controlling said variable duty cycle signal.
Claim 33
Dependent Claim
214 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix means includes means responsive to said time-spaced values for providing said output signal with values representative of respective coefficients of basis signal components of the signal to be analyzed and said transformation matrix means is at a location different from said synthesizer storage means and said synthesizer transformation matrix means and further comprising, a communication link means for coupling said output signal with values representative of respective coefficients of basis signal components of the signal then being analyzed to said plurality of synthesizer storage means, a plurality of synthesizer storage means for storing respective ones of said output signal values, synthesizer transformation matrix means having output means and a number of inputs corresponding to said plurality of synthesizer storage means for converting each of said stored output signal values in a predetermined manner to an output signal on said last-mentioned output means characterized by said stored output signal values, means for coupling each of said synthesizer storage means to a respective one of said synthesizer transformation matrix means inputs, and output processing means coupled to said last-mentioned output means for providing a synthesized output signal that is a continuous function of time having a waveform characterized by said stored output signal values.
Claim 34
Dependent Claim
136 words
Signal processing apparatus comprising, a plurality of synthesizer input terminals for receiving a corresponding plurality of input signals, a corresponding plurality of synthesizer storage means for storing respective ones of said input signals received on said input terminals, synthesizer transformation matrix means having output means with a number of output terminals and a number of transformation inputs corresponding to said plurality for converting each of said stored signals in a predetermined manner to provide an output signal on said last-mentioned output means characterized by the stored input signals, a signal output terminal, means for sequentially coupling the transformation matrix output terminals to said signal output terminal to provide an output sigNal having values as a function of time, and means for coupling each of said synthesizer storage means to a respective one of said transformation inputs.
Claim 35
Dependent Claim
136 words
Signal processing apparatus comprising, a plurality of synthesizer input terminals for receiving a corresponding plurality of input signals, a corresponding plurality of synthesizer storage means for storing respective ones of said input signals received on said input terminals, synthesizer transformation matrix means having output means with a number of output terminals and a number of transformation inputs corresponding to said plurality for converting each of said stored signals in a predetermined manner to provide an output signal on said last-mentioned output means characterized by the stored input signals, a signal output terminal, means for sequentially coupling the transformation matrix output terminals to said signal output terminal to provide an output sigNal having values as a function of time, and means for coupling each of said synthesizer storage means to a respective one of said transformation inputs.
Claim 36
Dependent Claim
101 words
Signal processing apparatus in accordance with claim 33 and further comprising detecting means with an axis crossing detector for providing said input signals comprising, a source of a moving light spot, a photodetector arranged to selectively receive light from said spot and provide a corresponding transduced output signal to a respective one of said input terminals, derivativing means responsive to said transduced output signal for providing a derivative signal corresponding to the derivative of said transduced output signal, and a zero crossing detector responsive to said derivative signal for providing a crossing output signal when said derivative signal passes through zero.
Claim 37
Dependent Claim
71 words
Signal processing apparatus in accordance with claim 33 and including deconversion circuit means for converting a time interval into the amplitude of a trigonometric function comprising, a resonant circuit having inductance and capacitance, means for applying a signal to said resonant circuit for the duration of a respective input signal to provide a signal whose value is proportional to a trigonometric function of said respective input signal and said resonant circuit.
Claim 38
Dependent Claim
59 words
Signal processing apparatus in accordance with claim 35 and further comprising, current draining means, gating means coupling said tank circuit to said current draining means to provide a product signal that is the product of said signal whose value is proportional to a trigonometric function with a second time interval proportional to the time said gating means is on.
Claim 39
Dependent Claim
29 words
Signal processing apparatus in accordance with claim 36 wherein said current draining means is a substantially constant current device having a resistor connected to a source of constant potential.
Claim 40
Dependent Claim
88 words
Signal processing apparatus detecting means with an axis crossing detector comprising, a source of a moving light spot, a photodetector arranged to selectively receive light from said spot and provide a corresponding transduced output signal to a respective one of said input terminals, derivativing means responsive to said transduced output signal for providing a derivative signal corresponding to the derivative of said transduced output signal, and a zero crossing detector responsive to said derivative signal for providing a crossing output signal when said derivative signal passes through zero.
Claim 41
Dependent Claim
88 words
Signal processing apparatus detecting means with an axis crossing detector comprising, a source of a moving light spot, a photodetector arranged to selectively receive light from said spot and provide a corresponding transduced output signal to a respective one of said input terminals, derivativing means responsive to said transduced output signal for providing a derivative signal corresponding to the derivative of said transduced output signal, and a zero crossing detector responsive to said derivative signal for providing a crossing output signal when said derivative signal passes through zero.
Claim 42
Dependent Claim
58 words
Signal processing apparatus in accordance with claim 33 and wherein said means for sequentially coupling comprises, multiplexing means including, a plurality of first stage gates each having an output, a second stage noise elimination gate, and means for coupling the outputs of said first stage gates in common to the input of said second stage noise elimination gate.
Claim 43
Dependent Claim
28 words
Signal processing apparatus in accordance with claim 33 and further comprising, partial control generator means coupled to said input terminals for providing a signal representative of predetermined partials.
Claim 44
Dependent Claim
28 words
Signal processing apparatus in accordance with claim 40 wherein said partial control generating means comprises, a flying spot scanning system including a photodetector and a photograph on film.
Claim 45
Dependent Claim
21 words
Signal processing apparatus in accordance with claim 40 and further comprising deconversion circuit means energized by said partial control generating means.
Claim 46
Dependent Claim
27 words
Signal processing apparatus in accordance with claim 42 and further comprising, analog storage condensers and distribution circuit means coupled to the output of said deconversion circuit means.
Claim 47
Dependent Claim
75 words
Signal processing apparatus in accordance with claim 1 wherein each of said storage means comprises storage capacitor means for storing substantially simultaneously samples of an input signal and its negative and said means for sequentially coupling comprises, a shift register, a plurality of gate means driven by said shift register for sequentially enabling said gate means, and means for coupling each of said storage capacitor means to only a respective one of said gate means.
Claim 48
Dependent Claim
16 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix consists of passive elements.
Claim 49
Dependent Claim
17 words
Signal processing apparatus in accordance with claim 45 wherein said passive elements comprise resistors, condensors and inductors.
Claim 50
Dependent Claim
25 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix comprises controllable elements and further comprising means for externally controlling said passive elements.
Claim 51
Dependent Claim
16 words
Signal processing apparatus in accordance with claim 1 wherein said transformation matrix consists of active elements.
Claim 52
Dependent Claim
127 words
Signal processing apparatus in accordance with claim 12 wherein said means responsive to said carrier signal and said output signal with values comprises, a source of a second carrier signal of the same frequency as said first-mentioned carrier signal in phase quadrature therewith, first and second modulating means for modulating said output signal with values with said first-mentioned and said second carrier signals, respectively, summing means for providing a resultant carrier signal that is the sum of the spectral components around said carrier signal frequency provided by said first and second modulating means, means responsive to said resultant carrier signal for providing a zero crossing signal representative of the time intervals between zero crossings of said resultant carrier signal and corresponding crossings of either modulating carrier signal.
Claim 53
Dependent Claim
83 words
Signal processing apparatus comprising, a first set of terminals, another terminal, transformation matrix means having an input and an output for establishing a predetermined relationship between a set of signals on said first set of terminals and a signal on said another terminal, means for coupling said first set of terminals to one of the input and output of said transformation matrix means, and means for coupling said another terminal to the other of the input and output of said transformation matrix means.
Claim 54
Dependent Claim
83 words
Signal processing apparatus comprising, a first set of terminals, another terminal, transformation matrix means having an input and an output for establishing a predetermined relationship between a set of signals on said first set of terminals and a signal on said another terminal, means for coupling said first set of terminals to one of the input and output of said transformation matrix means, and means for coupling said another terminal to the other of the input and output of said transformation matrix means.
Claim 55
Dependent Claim
60 words
Signal processing apparatus in accordance with claim 50 and further comprising, storage means having a plurality of storage elements for storing signals each coupled to a respective one of the terminals of said first set, said transformation matrix means comprising means for effecting a transformation between the signals stored in said storage elements and a signal on said another terminal.
Claim 56
Dependent Claim
140 words
Signal processing apparatus comprising, transformation matrix means have a first plurality at least three of terminals and a second plurality at least three of terminals, each of said first plurality of terminals associated with means for handling signal spectral components within a predetermined bandwidth, multiplexer means for sequentially coupling said second plurality of terminals to a common terminal at a predetermined repetition frequency and characterized by a transmission bandwidth at least equal to the sum of said predetermined bandwidths with the low end of said transmission bandwidth corresponding to said repetition frequency, said transformation matrix means coacting with the remainder of said apparatus to comprise means for providing any function of time having spectral components within said transmission bandwidth when each signal on said first plurality of terminals has spectral components within a bandwidth considerably less than said transmission bandwidth.
Claim 57
Dependent Claim
140 words
Signal processing apparatus comprising, transformation matrix means have a first plurality at least three of terminals and a second plurality at least three of terminals, each of said first plurality of terminals associated with means for handling signal spectral components within a predetermined bandwidth, multiplexer means for sequentially coupling said second plurality of terminals to a common terminal at a predetermined repetition frequency and characterized by a transmission bandwidth at least equal to the sum of said predetermined bandwidths with the low end of said transmission bandwidth corresponding to said repetition frequency, said transformation matrix means coacting with the remainder of said apparatus to comprise means for providing any function of time having spectral components within said transmission bandwidth when each signal on said first plurality of terminals has spectral components within a bandwidth considerably less than said transmission bandwidth.
Claim 58
Dependent Claim
71 words
Signal processing apparatus in accordance with claim 50 and further comprising, storage means having a plurality of storage elements for storing signals each coupled to a respective one of the terminals of said first set, said transformation matrix means comprising means for effecting a transformation between the signals stored in said storage elements and a signal on said another terminal, and means for scanning each of said storage elements in sequence.
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USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |