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:
Aug. 04, 1992
Filed:
Jun. 24, 1988
Shoji Araki, Kanagawa, JP;
Yukinobu Takano, Kanagawa, JP;
Tadahisa Yamamoto, Kanagawa, JP;
Noriyuki Uchiumi, Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A video telephone for transmitting video data of a still picture through an audio signal line includes an image pickup tube for picking up a picture of the still picture, an A/D (analog-to-digital) converter for converting the analog output picked up by the image pick-up tube to the form of a digital signal, a memory for storing the output of the A/D converter as video data, a modulating circuit for modulating the video data stored in the memory into a modulated signal of an occupied frequency band corresponding to a transmission band of the signal line, a circuit for transmitting the modulated output of the modulating circuit to the signal line, a circuit for generating a synchronizing pulse and a frequency-dividing circuit for frequency-dividing the color subcarrier signal to provide signals necessary for the A/D converter, the memory, and the modulating circuit, wherein the video data is a signal which results from thinning the picked-up output at a predetermined ratio.