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5265038 |
Computer system peripheral connection pulse filtering technique and circuit
A filtering circuit and technique that is especially adapted to remedy the possibility of pulses from becoming corrupted when passing between a microcomputer unit and one or more peripheral...
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5264829 |
Method and apparatus for theft detection using digital signal processing
Signals received by an electronic article surveillance system are processed digitally to ascertain the variation in magnitude of successive signals and to prevent the actuation of an alarm when the...
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5263192 |
Integrated resonant circuit with temperature compensated quality factor
A filter (13) for providing temperature compensation for the quality factor thereof comprises transconductance amplifiers (23 and 24) in a gyrator configuration coupled between an input node (21)...
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5262681 |
Trigger source switching circuit
A trigger source switching circuit including a first switch system for a high frequency region, and a second switch system for a low frequency region. The first switch system is composed of a...
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5260647 |
Measuring an AC signal value with sampling when the sampling interval does not exactly divide the AC signal's period
An AC input signal is sampled with a plurality of sets of equally spaced samples, but whose sample interval between the samples does not exactly divide the period of the input signal. Nevertheless,...
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5250917 |
Equivalent inductance circuit
An equivalent inductance circuit includes a feedback type integration circuit and a differential amplifying circuit. An input signal applied to an input terminal is integrated by the feed-back type...
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5241282 |
Wide dynamic range, low power, analog-to-digital receiver
A low power, wide-dynamic-range, signal compressor is suitable for operat from batteries. The compressor input is compatable with most sensors, resistive, capacitive or inductive and it is capable...
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5235224 |
Current detecting circuit using pulse transformer
A detecting circuit is provided with at least one transformer, in which a first transformer is connected at its primary winding to an input power source and has two windings at its output portion...
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5235223 |
Constant Q peaking filter utilizing synthetic inductor and simulated capacitor
A tunable circuit is disclosed which allows tuning while maintaining a constant Q. The filter uses a synthetic inductor and a capacitance multiplier in place of discrete inductive and capacitive...
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5227670 |
Electronic switch with very low dynamic "on" resistance utilizing an OP-AMP
An electronic switch with very low dynamic "on" resistance includes an operational transconductance amplifier including a non-inverting input adapted for connection to a reference potential and an...
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5227743 |
Automatic filter adjusting apparatus
An automatic filter adjusting apparatus including an adjustable filter having an input and an output, a reference signal generator for providing a reference signal to the filter, a generator for...
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5225836 |
Electronic filters, repeated signal charge conversion apparatus, hearing aids and methods
An electronic filter for filtering an electrical signal. Signal processing circuitry therein includes a logarithmic filter having a series of filter stages with inputs and outputs in cascade and...
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5218300 |
Method and equipment for noise-reduction when detecting a target by means of a system of several detector elements
The detector elements are sensitive to the target presence in their respective vicinities and are distributed in the surveillance zone. First differences (S1-S2, S3-S2, S4-S2) are formed from...
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5212658 |
Filter for obtaining a useful signal, constant with respect to time, from a noisy measuring signal
A filter for obtaining a useful signal, constant with respect to time, from a noisy measuring signal, having a measuring signal integrator and an optimal estimator (54) which represents a model of...
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5208494 |
Method for the elimination of transients from the operating voltage of TDMA system
This invention relates to a method by which transients can be eliminated in an apparatus comprising a current source and several functional blocks at least one of which produces transients in the...
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5206548 |
Noise reduction circuit
A noise reduction circuit having an amplification arrangement including first and second voltage-follower amplifiers coupled to a low-pass filter for providing symmetrical push-pull operation on an...
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5198710 |
Bi-directional digital noise glitch filter
A bi-directional digital noise filter will eliminate glitches of one delay while adding only one delay to the information signal. A first embodiment digital noise glitch filter 8 comprises a two...
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5196740 |
Integrated circuit for analogue system
This invention relates to semiconductor integrated circuits which find utility in analogue systems. An integrated circuit of the invention comprises an array of configurable analogue cells each of...
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5194768 |
Apparatus for filtering noise from a periodic signal
An apparatus for filtering noise from a periodic signal defined by successive occurrences of a first deviation and a second deviation. The apparatus comprises a first delay circuit for imposing a...
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5192884 |
Active filter having reduced capacitor area but maintaining filter characteristics
An active filter comprises a differential-type voltage-controlled current source. A first resistor is connected between the first input terminal of the voltage-controlled current source and a first...
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5192918 |
Interference canceller using tap-weight adaptive filter
An interference canceller comprises a first input terminal (10) to which a combined signal and noise is supplied, and a second input terminal (12) to which a reference signal correlated with the...
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5191285 |
Speed responsive filtering control system for flaw detection apparatus
A system for processing signals produced by magnetic flaw detection apparatus having facility for examining objects in the course of transport thereof at speeds varying from a prescribed slow speed...
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5185537 |
Gate efficient digital glitch filter for multiple input applications
A digital glitch filter includes first and second NOR gates coupled with feedback to form a first sampling stage, third and fourth NOR gates coupled to the output of the first and second NOR gate,...
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5182520 |
Non-linear de-emphasis circuit
In an apparatus for non-linear de-emphasis of an input signal, an amplitude limiting signal is obtained by subtracting a high-pass filtered and amplitude limited input signal from the original...
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5179302 |
Tunable data filter
An electronic data filter system (10), which functions as an approximation of a perfect matched filter, receives a conventional square-wave digital input signal (12) and outputs a filtered output...
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5177382 |
Active filter circuit
An active filter circuit comprises a differentiator constituted by an operational amplifier having an input terminal and output terminal, and a first integrator constituted by a first capacitor and...
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5172076 |
Resonant circuit formed of two amplifiers connected in a loop and multiple resonator circuits constructed therefrom
A resonant circuit comprises first and second amplifiers. An input of the second amplifier is coupled to an output of the first amplifier, and an output of the second amplifier is cross-coupled to...
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5170081 |
Ground isolation circuit
The present invention relates to a ground isolation circuit for use in connecting electronic circuits at the pre-stage and the post-stage having signal lines assigned for a plurality of channels,...
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5155395 |
Filter circuit comprising an amplifier and a capacitor
A filter circuit includes an amplifier having an amplifier element that receives an input voltage and a capacitor that provides an output voltage determined by the input voltage. The base-emitter...
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5153468 |
Method and a circuit for reducing microphony
By the method according to the invention, microphony, i.e. interference voltages caused by vibration, in a circuit including ceramic surface-mounted capacitors is reduced by eliminating the...
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5148062 |
Simplified phase shifter circuit
A phase shifter network which alternates between structurally dual networks is provided. In particular, the phase shifter has a topography which permits the network to be configured as...
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5126681 |
In-wire selective active cancellation system
An in wire active cancelling system cancels undesirable repetitive signal components from a primary electronics signal controlling desired intelligent signal components and undesirable repetitive...
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5124657 |
Composite signal processor and single-ended noise reduction system
A composite signal processor and single-ended noise reduction system uses a split input to the single-ended noise reduction circuit in such a manner that the audio signal from the output of the...
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5121009 |
Linear phase low pass filter
An electrical signal filter composed of a pair of cascaded filter sections in which the group delays of the two filter sections are matched so that their non-linear effects cancel in the passband,...
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5121057 |
Media flaw detection apparatus for a magnetic disk drive with squaring and summing of in-phase and quadrature-phase detected signals
A media flaw detection apparatus having a sensitivity which is independent of the location of the flaw relative to the written test signal. The apparatus is equally sensitive to missing or extra...
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5113098 |
Glitch remover circuit for transmission links
Glitch remover circuit for removing glitches and spikes from control signals received on a SCSI bus line that is coupled from a transmission line includes an input buffer circuit (12) and a filter...
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5113139 |
Low-distortion waveform generating method and waveform generator using the same
Waveform data read out of a memory is converted by a D/A converter into an analog waveform, and amplified by an amplifier to generate a waveform signal. To cancel a distortion generated in the...
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5107220 |
Frequency synthesizer
A frequency synthesizer includes a control circuit which outputs changeover signals for bringing one of a number of filters included in a loop filter into electrical connection with a VCO...
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5097156 |
Circuitry for compensating for transistor parameter mismatches in a CMOS analog four-quadrant multiplier
The present invention provides a circuit for eliminating quadratic and offset errors in the output of a CMOS four-quadrant analog multiplier. These errors are eliminated by feedback circuits that...
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5097155 |
Switched-current differentiators and filters
Switched current differentiators are used as the basic building blocks for discrete time signal processing to implement filters, biquads and high order ladder networks. These circuits can readily...
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5081423 |
Integrator and active filter including integrator with simple phase compensation
In an integrator circuit having a wide linearity range, there are provided: a first emitter-coupled transistor pair having two bipolar transistors, emitter areas of the transistors being...
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5072200 |
Combination of active and passive filters
A combination of passive electrical filters and active electrical filters in a series arrangement forming active passive band pass or high pass or low pass or band reject filters. The preferred...
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5059834 |
Circuit device for eliminating noise from an input signal independent of time of arrival of noise or noise width
A noise eliminating circuit for identifying and eliminating a noise component from an input signal and obtaining a normal signal as its output signal comprises first and second detectors and an...
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5043722 |
Detector for colliding signals in asynchronous communication
A communications system has an active master node which transmits request messages in serial bit fashion on a data bus, and a plurality of responder nodes each of which receives the request...
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5043653 |
Noise filter for zero crossing detector
A noise filter for the zero crossing detector of a digitized sine wave signal uses an adjustable noise integrator. The noise integrator incorporates a counter. The integration characteristic of the...
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5041415 |
Superconducting noise discriminator
A noise limiter for a binary circuit in which a thin film superconductor is put in shunt between a transmission line and ground. The thin film exhibits a gradual transition region as a function of...
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5039890 |
Integratable filter circuit
A filter circuit suitable for integration has first and second voltage/current converters. A signal source is coupled to the first voltage/current converter. A capacitor is coupled to the second...
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5038115 |
Method and apparatus for frequency independent phase tracking of input signals in receiving systems and the like
The output signal of a phase tracking system maintains phase coherence with the dominant input signal while tracking the frequency of that same dominant input signal without additional phase...
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5030848 |
Precision voltage divider
A voltage divider circuit having divider resistors which are not precision resistors. A first oscillating signal is input into a first resistor and the complement of the first oscillating signal is...
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5025207 |
Method for the measurement of a steady level in a noise-infested signal and automatic measuring device for the application of this method
The disclosure concerns automatic measuring stands. The automatic measurement of the amplitude of an intermodulation line at the output of a TV transmitter is difficult to achieve because this line...
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