The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 1977
Filed:
Mar. 29, 1976
Masamichi Furukawa, Tokyo, JA;
Susumu Iguchi, Tokyo, JA;
Ricoh Co., Ltd., Tokyo, JA;
Abstract
An address counter sequentially addresses locations in a shift register or random access memory in which a waveform is stored in digital form to display the waveform on a cathode ray tube. Several magnification ranges are provided so that a selected portion of the waveform may be viewed in magnified form. A manually controllable position counter selects the portion of the magnified waveform for viewing in such a manner that the center of the portion will remain in the center of the cathode ray tube when the system is switched between magnification ranges. The position counter is an up-down counter which is driven by a same clock pulse generator which drives the address counter. A variable frequency divider is provided between the clock pulse generator and the position counter in such a manner that the position counter is driven at a convenient speed regardless of the magnification range. Two manually controllable mark counters similar to the location counter are also driven from the clock pulse generator, and indicate memory locations for which respective markers are to be displayed on the cathode ray tube. The contents of the memory location corresponding to the first of the markers is displayed in digital form, and the time difference between the markers is also measured and displayed in digital form. Variable frequency dividers provide magnitude and time scaling for the digital displays, and also ensure movement of the markers on the cathode ray tube at a convenient speed regardless of the magnification range. The frequency dividers are switched so that the address and mark counters are driven at low speed when the selected portion for magnification and marks are addressed and at high speed at other times.