Pulse amplitude modulation circuit with pulse width...

Details Pulse amplitude modulation circuit with pulse width... Pulse amplitude modulation circuit with pulse width...

2007-07-25

2011-10-18

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal processing for controlling recording light...

Reexamination Certificate

active

08040776

ABSTRACT:
In pulse width control equalization, attention is paid to the existence of the symmetry of anteroposterior signals and thereby the size of a table in which the adjustment amount of an edge position is stored is reduced to the power of one-half. Pattern jitters caused by inter-symbol interference are suppressed. The pulse time span of each symbol is adjusted to an optimum pulse width determined by a calculating formula or search in a table in response to a code sequence to be transmitted. In the configuration wherein a table is used, the table to store an edge position adjustment amount wherein the row of the exclusive OR of two symbols located at positions symmetrical to each other before and after a center symbol now ready to be sent in the code sequence is used as a search key is made.

REFERENCES:
patent: 6370097 (2002-04-01), Hayashi et al.
patent: 2003/0142603 (2003-07-01), Nakajo
patent: 2005/0058047 (2005-03-01), Fujita et al.
patent: 2005/0068060 (2005-03-01), Ooshita et al.
patent: 2005/0265184 (2005-12-01), Sekiguchi et al.
patent: 2006/0140097 (2006-06-01), Tasaka et al.
patent: 11-259863 (1999-09-01), None
patent: 2005-057686 (2005-03-01), None

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