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8004341 |
Logarithmic circuits
An embodiment of a logarithmic circuit may include a logging transistor, a guard circuit arranged to force an input current into an input terminal of the logging transistor, and a positioning...
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7395308 |
Grounded emitter logarithmic circuit
A logarithmically-responding circuit includes a differential-input amplifier that drives the control terminal of a three-terminal device that exhibits an exponential response in its output current....
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7194615 |
Reconfigurable apparatus being configurable to operate in a logarithmic scale
An integrated circuit has a command/control bus and a number of processing elements. The processing elements contain a number of parts, each part being connected to said command/control bus. Each...
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6282290 |
High speed modular exponentiator
A modular exponentiator is adapted to receive a first communicated signal and derive a second signal therefrom by computation of a modular exponentiation of the form be mod n based on the first...
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4939688 |
Dynamic range converter providing a multiplicity of conversion ratios
An electric signal converter utilizes a processing unit to establish a polynomial of n terms, each term being a power of the signal at the input terminal of the processor multiplied by an...
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4901272 |
Variable phase compensating apparatus
A circuit arrangement is provided for phase compensation for a feedback amplifier circuit which has a variable gain depending upon the level of an input, so that a broadened frequency range in...
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4791403 |
Log encoder/decorder system
A high speed form of finite precision binary arithmetic coding comprises encoding/decoding performed in the logarithm domain, resulting in facilitated computation based on additions and...
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4532604 |
Predistortion circuit
A predistortion error signal, corresponding to the third harmonic of an input signal, is generated by obtaining the absolute value of the input signal and multiplying it by the input signal of...
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4385364 |
Electronic gain control circuit
An electronic gain control circuit comprising a logarithmic circuit portion and an antilogarithmic circuit portion which is coupled to a current mirror circuit producing an output signal which is...
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4356449 |
Logarithmic attenuating circuit
A logarithmic attenuating circuit is disclosed for multiplying by a constant factor the logarithmic range of input voltages which can be accomodated by a variety of test equipment. The circuit...
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4300203 |
Method and means for operating logarithmic circuits
A method and means for operating log converter circuits in which the method comprises the steps of sequentially conducting to the input of the log converter circuit signals representing a known...
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4290111 |
Decibel addition circuit
An addition circuit for adding two decibel measurements received at input terminals 12 and 14, first substracts the inputs in a subtractor circuit 16 to obtain a difference d. Then, based upon the...
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4245318 |
Circuit breaker demonstrator and distribution circuit protection coordinator apparatus
Demonstrator apparatus utilizes a display to portray in log-log coordinate scale the trip-time curve of a solid state (static) trip circuit breaker. A simulated static trip unit programmer is...
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4206998 |
Exposure control method for an automatic color printer with slope control
The density of a negative is measured by a photocell and log converted through a log conversion amplifier. The log converted density is then converted with a properly selected gain to a value...
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4168492 |
Temperature compensated antilogarithmic converter
A temperature-compensated antilogarithmic converter has a temperature-sensitive signal generator for generating a temperature dependent signal which varies in proportion to absolute temperature; a...
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4156283 |
Multiplier circuit
A linear analog multiplier circuit for multiplying electrical quantities comprises a pair of differentially connected nonlinear control devices, for example, transistors, and at least one further...
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4143363 |
Nonuniform translation between analog and digital signals by a piece-wise linear process
A weighted resistance network under control of combinational and sequential logic circuits provides a separate reference voltage at each of the digit times of the pulse code for comparison with an...
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4139896 |
Method and apparatus for producing nonlinear integral functions
An integrator system is disclosed which incorporates a feedback control loop to vary the linearity of the integrator's response. In the preferred embodiment an electrochemical coulometer is used...
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4092724 |
Polar converter
A polar display representing the ratio of two input signals is provided by exponentiating the logarithmic ratio of two input signals. The DC voltage thus produced, which is proportional to the...
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4090679 |
Tape tension imparting apparatus
A method of imparting a predetermined tension to a tape transported at a predetermined velocity from one to the other of the reels mounted on a pair of reel spindles at least one of which is...
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4091329 |
Logarithmic circuit with wide dynamic range
A circuit deriving an output voltage that is proportional to the logarithm of a DC input voltage susceptible to wide variations in amplitude includes a constant current source which forward biases...
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4065682 |
Logarithmic converter
A system for deriving a voltage which is a logarithmic function of peak value of an audio signal, in which the audio input signal is amplified by means of an operational amplifier having bipolar...
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4062013 |
Non-linear type digital-to-analog converter
A non-linear type digital-to-analog converter comprising a decoder, control switching circuits controlled respectively by the outputs of the decoder, and an exponential function generating circuit...
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4046999 |
Logarithmic function generating system
A logarithmic function generating system which generates an output signal bearing a logarithmic functional relation to the input signal. The time constant RC of a resistance-capacitance circuit is...
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4041299 |
Multiplication apparatus
A plurality of input signals to be multiplied are applied sequentially to a logarithmic time-width transformer in a form of electric analog signal in a predetermined order. The transformer converts...
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4038566 |
Multiplier circuit
A gain control or multiplier circuit in which an ac signal is applied through bipolar diodes having logarithmic response characteristics to the bases of bipolar transistors connected in series and...
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4011502 |
Logarithmic ratemeter with bistable signal comparison
A logarithmic ratemeter has a plurality of bistable devices each having two inputs the first of which is connected to a common input line for receiving voltage pulses from a detector of atomic...
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4004141 |
Linear/logarithmic analog multiplier
An analog device for generating an output signal which is proportional to the linear product between a first input signal and the antilogarithm of the second input signal, and comprising a means...
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3967105 |
Transistor power and root computing system
A transistorized non-linear device is provided for converting input voltage signals to logarithmic current output signals and input current signals to exponential output voltage signals. This is...
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3965344 |
Computer utilizing logarithmic function generators
Analog apparatus for deriving any root of any input variable directly proportional to an input signal. A second signal directly proportional to the logarithm of the variable is divided in...
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3940603 |
Four quadrant multiplying divider using three log circuits
Three log circuits are fed by respective x, y and z inputs, along with predetermined interconnections therebetween. The outputs from the log circuits are log z, log (x+z) and log (y+z). These...
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3883187 |
Exponential generation in an adaptive braking system by charge transfer
In a speed logic adaptive braking system for wheeled vehicles an increasing exponential function, which is initiated when the braking force is automatically released, is compared to a signal...
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3878383 |
System for converting a ratio of two signals into a logarithmic value
A system for converting a ratio of two input signals into a logarithmic value comprises the steps of charging a capacitor with an electronic charge which is proportional to said first input signal...
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3870226 |
COMPACTION OF A SURFACE WITH A COMPACTOR HAVING WHEELS
A device for continuously measuring a signal which varies as a hyperbolic or exponential function comprising an analog circuit having two signal input terminals, one of which is connected to a...
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3809875 |
FAST RESPONDING ALTERNATING CURRENT VOLTMETER HAVING AN OUTPUT THAT IS LINEAR IN DECIBELS
A series of variable gain amplifiers connect an alternating current signal input to a rectifier and log conversion circuit. The rectifier portion of the circuit charges one capacitor to a level...
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3805046 |
LOGARITHMIC CONVERSION SYSTEM
A new logarithmic conversion system takes advantage of the time domain as an intermediate step in converting an analog input signal into an output signal which is a function of the logarithm of the...
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3792246 |
VECTOR ANGLE COMPUTER
An output voltage proportional to the angle of a vector is provided by apparatus including a logarithmic function generator. The output voltage is proportional to the difference between the...
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3772563 |
VECTOR GENERATOR UTILIZING AN EXPONENTIAL ANALOGUE OUTPUT SIGNAL
An improved vector generating electrical system is provided for forming the mathematical representation of a vector. The system is particularly useful for drawing images in any desired pattern on...
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3743949 |
RMS SENSING APPARATUS
An RMS sensing device wherein a first electrical quantity proportional to the square of at least a portion of an electrical quantity to be measured is established, by passing the desired portion of...
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3739164 |
DEVICE FOR COMPENSATING A DERIVED SIGNAL
A second derived signal is compensated over a particular range for undesired deviation caused by an error signal component in a first measured signal, from which the second signal is derived. A...
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3736415 |
ELECTRIC ANALOGUE CALCULATING CIRCUITS
An electric analog calculating circuit uses a single logarithmic stage for all steps of a calculation. Each input quantity is applied to the stage and the resulting output stored in a signal...
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3733465 |
LOG-BASE ANALOG BALLISTICS COMPUTER
An electronic analog ballistics computer wherein various ballistics correon analog signals as well as the log of the range from a range finder, either optical or one employing the laser principle...
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3715656 |
METHOD AND APPARATUS FOR MEASURING THE CHARGE-TIME RESPONSE OF MATERIALS BY APPLYING A VOLTAGE STEP ACROSS THE SAME
A method and apparatus for measuring the charge-time response of an insulating material to a voltage step applied across it by applying to a capacitor containing a specimen of the material as...
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3710089 |
HIGHLY PRECISE AND STABLE LOGARITHMIC CIRCUIT
A logarithmic circuit of a highly precise and stable type useful in absorption metering apparatus where the range of input signals is narrow. The circuit receives an input signal which has the form...
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3691473 |
VOLTAGE RATIO APPARATUS WITH LOGARITHMIC OUTPUT
Both an input voltage signal and an adjustable reference voltage signal are compared with an exponential wave for providing, through a logic circuit, an output pulse whose width is proportional to...
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3686492 |
METHOD AND DEVICE FOR SIMULATING TRAFFIC
The invention concerns the simulation of vehicle traffic along one or several paths. It is a method and device for the simulation of traffic in which an electrical analogy is used. Each section of...
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3676661 |
VOLTAGE-TIME-VOLTAGE COMPUTATION CIRCUIT USING R-C EXPONENTIAL DECAY CIRCUITS TO PERFORM MULTIPLICATION, DIVISION, ROOT-FINDING AND LOGARITHMIC CONVERSION
A new class of linear circuits can multiply and divide, find powers and roots, and perform both logarithmic and antilogarithmic conversions. The circuits convert incoming voltages into...
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3659082 |
ELECTRICAL CIRCUITRY FOR LOGARITHMIC CONVERSION
A log converter circuit has converter and reference transistors connected in differential pair relation. An operational amplifier is connected in circuit with each transistor and a storage circuit...
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3657528 |
RMS VOLTMETER AND LOG CONVERTER
An RMS voltmeter and logarithmic converter using electronic mathematical operators for determining the RMS value and its logarithm of an input signal. A source of electrical signals to be measured...
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3653033 |
NON-LINEAR DECODER WITH LINEAR AND NON-LINEAR LADDER ATTENUATORS
A PCM word decoder has a characteristic curve which is symmetrical with respect to zero abscissa point. Starting from the zero abscissa point, the curve comprises a linear part corresponding to the...
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