摘要:
In a sampling gate circuit, a broadband and high-precision sampling gate circuit is realized by further employing first and second equivalent sampling networks which are equal to a sampling operation by a first sampling gate circuit. The first and second equivalent sampling networks compensate for distortions in the signal output by the first sampling gate circuit and allow an input waveform to be reproduced at high precision. The output from the first sampling gate circuit is input to a positive terminal of a differential amplifier. The outputs from the first and second equivalent sampling networks are input into two respective negative inputs of a differential amplifier, to cancel the distortions of the signal output from the first sampling gate circuit and input to the positive terminal of the differential amplifier. This device may find particular application in sampling type oscilloscopes or the like.
摘要:
A display circuit of an oscillscope to switchingly display waveforms and characters has substantially no fluctuation phenomena caused by switching waveforms and characters. Each driving amplifier for waveforms and characters is employed to drive a final stage amplifier of which outputs are applied to deflection plates of a CRT. As a driving amplifier is not used in common to amplify waveforms and characters, clear waveforms and characters are observable without fluctuations.
摘要:
A microprocessor emulation apparatus for debugging a microprocessor of an electronic system without utilizing an interrupt signal and a stop signal to temporarily stop an operation of the system. The apparatus makes the system execute a program in the apparatus for reading and modifying contents stored in the system without using of control signals from the system by exchanging buses of the system to bus means of the apparatus to produce a pseudo stopping state, whereby the pseudo stopping state does not make the system execute a stored program of the system and which provides an analysis state which causes the system to execute the program in the apparatus.
摘要:
A pen control circuit includes a current control circuit for controlling the magnitude of a driving force of a drive coil, a feedback circuit for supplying a feedback signal to the current control ciruit, a clipper for extracting the pen position detection signal only when the level of the pen is higher than a predetermined level with respect to a recording surface, and a selector for selecting first, an output from the clipper as a drive current setting value of the current control circuit during an initial pen-down period and second, the pen pressure setting signal as the drive current setting value after the output from the clipper is disabled. The pen control circuit also includes a current setting circuit for supplying a predetermined drive current setting value to the current control circuit in a pen-up mode and a limiter for limiting a current supplied to the drive coil in accordance with a pen position detection signal when the pen is moved upward to a predetermined position.
摘要:
When latent images in a magnetic printing apparatus are recorded and developed, a magnetic pattern which has one direction and which has at least two magnetic transfer regions is formed at one-dot black picture regions on a recording medium. When the black picture regions have two or more dots, beside the magnetic pattern having one direction, at least one magnetized pattern having the other direction is formed therein. A white picture region is formed by a magnetized pattern which is longer than the magnetized pattern in the black picture region and which has the other direction. The developing magnetic field is formed in the same direction as that of the other direction. A print having high resolution can be obtained by mutual action between the developing field and the magnetic field generated by the magnetized pattern for the recording.
摘要:
A method of controlling a position of a plate material sheet in a platemaking machine for feeding the plate material sheet in an exposure region and forming a document image on the plate material sheet. A plate material sheet length sensor detects that the plate material sheet to be fed to the exposure region has passed by the sensor. The overall length of the plate material sheet is calculated in accordance with the number of pulses supplied to a plate material sheet drive motor while the plate material sheet length sensor generates an output. Also calculated is a first predetermined number of pulses to be supplied to the plate material sheet drive motor so as to feed the plate material sheet by a first predetermined length within the exposure region. A stop sensor detects a front edge of the plate material sheet, the stop sensor being arranged such that a center thereof is aligned with the axis of the optical system; and the first predetermined number of pulses is supplied to the plate material sheet drive motor after the stop sensor generates an output, so that a center of a first portion of the plate material sheet is aligned with the axis of the optical system.
摘要:
A sweep generator for the delivery of a sweep signal to a deflection system (typically horizontal) of a cathode ray tube, including a sawtooth generator for generating a sawtooth waveform containing a ramp which determines the duration of each sweep. A frequency divider such as a D flip flop is connected to a trigger circuit for generating, when enabled by a holdoff signal, output pulses whose recurrence rate is a submultiple of that of the incoming trigger pulses. Also when enabled by the holdoff signal, a sweep gating flip flop responds to the first output pulse from the frequency divider for causing the sawtooth generator to generate the sweep ramp. Thus, since the sweep gating flip flop does not directly responds to the trigger pulses, but to the output pulses of the frequency divider, no jitter is to take place if the holdoff signal acquires a prescribed state for sweep initiation concurrently with a trigger pulse. An additional embodiment is disclosed which includes a pseudotrigger pulse generator for affording a higher sweep frequency when the trigger frequency is low.