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:
Sep. 06, 1977
Filed:
Jul. 10, 1975
Arnold Jan Bijker, Eindhoven, NL;
Karel Riemens, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
In a digital transmission for low bit rate transfer of speech signals, the frequency information content of the speech signal is transferred via a first transmitter channel and the amplitude information content is transferred via a second transmitter channel. A particularly low bit rate of 4.8 to 7 kbits/second is made possible in that the transmission device in the first transmitter channel is in the form of a uniform delta modulator which is provided with an input circuit which so changes the shape of the speech signal that the input signal to the delta modulator has a constant slope.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile