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. 31, 1987
Filed:
Jun. 19, 1985
Dominique Godard, Le Rouret, FR;
International Business Machines Corp., Armonk, NY (US);
Abstract
A sinusoidal test signal of a given frequency is applied by the generator 12 to the transmission channel 10. The output signal from the channel is sampled at 16 and fed to a Hilbert transformer 20 through an ADC 18. The sampled outputs from the Hilbert transformer are fed to a device 26 which derives therefrom the phase of the received signal. The phase of the test signal generated at 30-34 is subtracted from that of the output signal from device 26 and the resultant signal is fed to a phase filter 36, which removes therefrom the phase intercept and frequency shift components. The output from filter 36 is fed to a predictive filter 40 which removes the residual noise therefrom. A detector 42 measures the variations of the phase jitter values provided by predictive filter 40.