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. 20, 1984
Filed:
Nov. 09, 1981
Hans Brandl, Munich, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A differential digital modulation and demodulation system with an analog signal-dependent sampling clock has a sampling clock-controlled first digital modulator and a predictably functioning second digital modulator, an analog signal to be converted to a digital signal being supplied to both modulators. A control signal for the sampling clock generator for the first digital modulator is generated from a tracking error signal of the second digital modulator, so that the clock frequency of the first digital modulator is increased upon an increasing tracking error and is decreased upon a decreasing tracking error. For digital signal transmission or storage, the digital signal bits are emitted by the modulator and received by the demodulator in the form of signal blocks which include a bit group indicating the respective sampling clock frequency in encoded form. Only one signal block indicating the pause length in encoded form is emitted or received for a particular analog signal pause.