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. 12, 1995
Filed:
Aug. 04, 1994
Koichiro Tanaka, Takarazuka, JP;
Toshikazu Nezu, Neyagawa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The demodulator for digital modulation signals comprises a frequency detection device, an integral discharge filter, a summing device, a discrimination device, and a noise-compensating signal generation device. The frequency detection device outputs frequency detection signals by detecting frequencies of the digital modulation signals. The integral discharge filter outputs phase deviation signals by integrating the frequency detection signals for a given interval. The feedback summing device outputs compensated phase deviation signals to the discrimination device by feeding back the noise-compensating signals from the noise-compensating signal generation device to phase deviation signals from the integral discharge filter. The discrimination device outputs demodulation data by discriminating the deviation of the digital modulation signals based on the compensated phase deviation signals. The noise-compensating signal generation device outputs the noise-compensating signals based on the compensated phase deviation signals and the demodulation data. Also, another demodulator for digital modulation signals further comprises a compensation device for interference from preceding data in addition to the above construction. The compensation device for interference from preceding data outputs interference-compensated phase deviation signals by removing the interference from the preceding demodulation data from the compensated phase deviation signals.
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