Abstract:
A variable interval electromagnetic pulse train generator having a semiconductor substrate on which is mounted on one surface thereof a plurality of spaced apart electrodes and on another surface thereof an electrode base plate. A voltage source is connected to each of the plurality of spaced apart electrodes while the space between electrodes have optical pulses directed thereon. By controlling the voltage applied to the electrodes and the optical pulses directed between electrodes the pulse train generator is capable of emitting a series of variable, spaced apart electromagnetic pulses.
Abstract:
An electronic digital timing control apparatus for controlling different durations for two sequential events in alternation, especially in environmental systems. The timing control apparatus is programmable and contains a single oscillator and a binary counter which counts a predetermined fixed number of output cycles from the oscillator. At one end of the first count, tuning components for the oscillator are switched in order to change the oscillator frequency and thereby the duration for the next count for the next corresponding event.
Abstract:
A digital synthesizer primarily intended for use in electronic musical instruments which are microprocessor controlled includes a plurality of storage devices which contain numerical data commensurate with the characteristics of an output signal to be produced. Information is read out of these storage devices under the control of command signals having a predetermined repetition frequency. The generation of the command signals is controlled in such a manner as to permit the generation of harmonically related frequencies.
Abstract:
This system generates output pulses in successive periods of time, each including sub-intervals during which the output pulses may be varied in accordance with a pre-determined scheme. The time periods and sub-intervals within the periods are defined by means of signals derived from a fundamental clock frequency generation circuit and first and second parallel sets of frequency division circuits connected to the fundamental frequency generation circuit. The first set of frequency division circuits is used together with a sub-interval timing circuit to define the sub-intervals of time included in each period. A system control means is connected to the frequency generation and division circuits, the timing circuits, a means for entering information into the system defining the periods and sub-intervals and the characteristics of output waveforms to be produced in each sub-interval, and to a variable electrical signal generation means which produce the output waveforms in accordance with the information entered into the system. Since the time periods, sub-intervals and output waveforms are all variable in accordance either with a pre-determined scheme, or on a real time basis depending on response of a subject under test, this system may be used to generate complex strings of waveforms especially suitable for measuring responses of biological samples to stimulation by electrical signals in pharmacological, physiological and other biomedical applications.
Abstract:
Servo-controlled frequency multivibrator composed of two monostable elements looped together comprising a first and second digital element controlling respectively a first and second logic gate ensuring in the one case the synchronous starting of the multivibrator on the pilot frequency F and in the other case the blocking thereof and a servo-control regulating circuit for the polarization voltage of the monostable elements, sensitive to the comparison between the end of the mth pulse having a frequency F and of the nth pulse having a frequency of f of the multivibrator, m and n being chosen so that m/F n/f.
Abstract translation:由两个单稳态元件组成的伺服控制频率多谐振荡器,其包括分别控制第一和第二逻辑门的第一和第二数字元件,确保在一种情况下,多谐振荡器在导频F上的同步启动,另一种情况下阻塞 以及用于单稳元件的极化电压的伺服控制调节电路,对于具有频率F的第m个脉冲的端部与具有多谐振荡器f的频率f的第n个脉冲之间的比较敏感,m和n为 选择使得m / F = n / f。
Abstract:
A pulse source, primarily for use with a keyboard in a telephone network, for providing a pulse output compatible with both keyboard and dial telephone networks. The telephone keyboard activates a pulse generator which produces an output compatible with keyboard telephone networks. If the network is of the keyboard type then the output of the generator is applied directly to the telephone network. If the network is of the dial type then the output of the pulse generator is applied to a memory device which stores the output of the pulse generator and generates in response thereto a pulse train at a second rate compatible with a dial network and which corresponds to the output of the keyboard.
Abstract:
A machine tool contour control system for directing a tool at a preselected substantially constant speed along a straight line path defined by distance components parallel to orthogonal axes. For each axis, a drive means toward the tool through a unit of distance in response to a command pulse for that axis. A generator simultaneously provides to each separate drive means a train of command pulses equal in number to the distance to be moved along the corresponding axis, the distance components being specified by binary inputs. The command pulse rates, and hence the tool speed, depend on the rate at which clock pulses are supplied to the generator. A path length compensator controls the clock pulse rate as a function of a correction factor related to the length of the straight line path. This compensator comprises appropriate decode logic, responsive to the command pulses, for setting a decrementing counter to a value related to the correction factor. A comparator and a binary counter, driven at a programmed rate directly related to the preselected speed, cooperate with the decrementing counter to provide clock pulses at a rate equal to the programmed rate times the correction factor. Another compensator further modifies the clock pulse rate depending on the position of the most significant one bit in the largest of the binary inputs bypassing the inactive bits of greater significance.
Abstract:
A reliable trigger signal may be produced from a periodic electrical signal having several voltage peaks in each cycle by providing a controlled rectifier that is switched to its conductive state by the receipt of one of the voltage peaks. The switching of the controlled rectifier energizes a signal generator that returns the controlled rectifier to its nonconductive state only after the occurrence of all voltage peaks in each cycle. As a result, only one trigger signal is produced in each cycle. The signal generator is controlled by a timing circuit that is charged to a progressively higher voltage as the cyclical repetition rate of the periodic electrical signal increases, thereby decreasing the time in each cycle in which the controlled rectifier conducts.
Abstract:
An auxiliary circuit for adjusting the time-constant of electrical apparatus, such as that of a relaxation oscillator having resistor-capacitor time-constant circuit elements. The adjustment is maintained while an electrical adjusting signal is present. This biases a transistor into conduction and places a second resistor in parallel with the basic resistor of the timeconstant circuit, thereby reducing the time-constant. Alternate embodiments selectively allow plural adjustments, also adjustment of plural separate electrical devices.
Abstract:
A SYSTEM FOR GENERATING PULSES WHOSE TIMING IS SUBSTANTIALLY IN ACCORDANCE WITH A LOGARITHM OF THE ELASPED NUMBER OF LINEAR (PERIODIC) CLOCK PULSES EMPLOYS AN ACCUMULATOR AND A BACKWARD COUNTER, BOTH OF WHICH COUNT CLOCK PULSES. A COUNT DETECTOR EMITS AN OUTPUT PULSE WHENEVER THE COUNT IN THE BACKWARD COUNTER REACHES ZERO. A DATA SHIFTING NETWORK THEREUPON TRANSFERS THE CONTENTS OF THE ACCUMULATOR INTO THE BACKWARD COUNTER AND THE LATTER IMMEDIATELY RECOMMENCES COUNTING ITS CLOCK PULSES UNTIL IT REACHES ZERO AGAIN, WHILE THE ACCUMULATOR CONTINUES COUNTING UPWARDLY. THUS, THE DETECTOR EMITS A TRAIN OF OUTPUT PULSES WHOSE SPACING INCREASES EXPONENTIALLY.