logo

For the Inventor, By the Inventor

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.:

US 4785252 B1

PDFFull Text
Date of Patent:
Nov. 15, 1988

Filed:

Oct. 08, 1986

Waveform processing circuit

Applicant:
Inventors:

Hiroshi Fuji, Tenri, JP;

Takashi Iwaki, Tenri, JP;

Tsuneo Fujiwara, Tenri, JP;

Toshihisa Deguchi, Nara, JP;

Shozou Kobayashi, Nara, JP;

Assignee:

Sharp Kabushiki Kaisha, Osaka, JP;

Attorney:

Birch, Stewart, Kolasch & Birch

Primary Examiner:

Stanley D Miller

Assistant Examiner:

Tai Van Duong

Int. Cl.
CPC ...
H03K / ; H03B / ;
U.S. Cl.
CPC ...
328151 ; 328167 ; 307353 ; 307358 ; 360 48 ;
Abstract

A waveform processing circuit includes a switching circuit having first and second inputs and one output. The first input receives head portions and data portions contained in a reproduced signal from an optical head. The second input receives a level signal representing the level of the head portion or the level of the signal carrying the head portion. The switching circuit is switches between a first state in which the first input and the output are connected, and a second state in which the second input and the output are connected. A control signal producer produces a first control pulse indicating the presence of the data portion. The first control pulse is applied to the switching circuit for actuating the switching circuit to establish the first state when the first control pulse is present, and to establish the second state when the first control pulse is not present, so that the switching circuit continuously produces the signal having a level within the range of the head portion. Thus, no abrupt change caused by transient phenomena will be observed in a high pass filter connected to the switching circuit.

Find Patent Forward Citations

Fuji, Hiroshi. (1988). Waveform processing circuit (U.S. Patent No. 4785252). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4785252

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Loading…