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:
Mar. 06, 1979
Filed:
Jul. 13, 1977
Akira Horiki, Yokohama, JP;
Hitachi, Ltd., , JP;
Abstract
An analog-digital code converter in a digital telephone switching system is disclosed wherein when an analog voice signal from an analog line is applied to an analog per line unit it is sampled at a high rate and a high speed sampling digital code produced by .DELTA.M-PCM modulation is converted to a low speed sampling digital code through a digital filter provided in a common unit for application to a time division digital speech path switch, and when a wide band broadcasting service signal from the same analog line is applied to the analog per line unit, a path is provided between the analog per line unit and the time division digital speech path switch which path bypasses the digital filter without allowing the conversion of the high speed sampling digital code of the analog per line unit to the low speed sampling digital code, whereby wide band communication as well as ordinary speech band communication are attained.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile