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:
May. 30, 2006
Filed:
Jan. 29, 2002
Jun Sato, Kanagawa, JP;
Akiya Saito, Kanagawa, JP;
Toru Aida, Kanagawa, JP;
Yoshinobu Usui, Kanagawa, JP;
Jun Sato, Kanagawa, JP;
Akiya Saito, Kanagawa, JP;
Toru Aida, Kanagawa, JP;
Yoshinobu Usui, Kanagawa, JP;
Abstract
The present invention relates to a signal shaping circuit which is capable of shaping a returning light signal of a modulated signal whose signal level and signal length are arbitrarily varied such that it can be demodulated. The shaped signal pattern generation circuithas, in advance, variation pattern information with regard to a predetermined variation pattern to be applied on a returning light signal recorded therein. The counterinputs a returning light signal, counts a signal length thereof and sends a count value to the shaped signal pattern generation circuit. An A/D conversiondetects a signal level of the returning light signal and sends the detected signal level to the shaped signal pattern generation circuitin a similar way. The shaped signal pattern generation circuitrefers to the variation pattern information and calculates an optimum signal pattern corresponding to a signal length and a signal level of the inputted, returning light signal. The calculated shaped signal pattern is outputted to a shaped signal generation circuit. Based on the signal pattern, the shaped signal generation circuitconverts the returning light signal and generates an optimum shaped signal.