Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system
Reexamination Certificate
2007-12-24
2009-10-13
Dunn, Drew A (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Mechanical measurement system
C702S082000, C250S227230, C398S140000
Reexamination Certificate
active
07603241
ABSTRACT:
An optical receiving apparatus that receives an optical signal and outputs a data value of digital data transmitted by the optical signal is provided, including a light receiving element that receives the optical signal and outputs a photocurrent according to a strength of the optical signal, a present cycle integrator that integrates the photocurrent corresponding to a present cycle of the digital data over a prescribed period within the cycle, a previous cycle integrator that integrates the photocurrent corresponding to a cycle prior to the present cycle over a period that is substantially equal to the prescribed period in the cycle, and a data value identifying circuit that outputs a data value of the present cycle of the digital data based on a difference between a charge amount obtained through integration by the present cycle integrator and a charge amount obtained through integration by the previous cycle integrator.
REFERENCES:
patent: 61-167250 (1986-07-01), None
patent: 07-264142 (1995-10-01), None
patent: 10-271064 (1998-10-01), None
patent: 2000-201113 (2000-07-01), None
patent: 2001-197129 (2001-07-01), None
patent: 2005-025768 (2005-01-01), None
Okayasu Toshiyuki
Watanabe Daisuke
Advantest Corporation
Dunn Drew A
Jianq Chyun IP Office
Vo Hien X
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