Electrical computers and digital processing systems: support – Clock – pulse – or timing signal generation or analysis
Reexamination Certificate
2006-12-05
2006-12-05
Browne, Lynne H. (Department: 2116)
Electrical computers and digital processing systems: support
Clock, pulse, or timing signal generation or analysis
C713S503000
Reexamination Certificate
active
07146518
ABSTRACT:
A low-pass filter in a read channel, having an adjustable cutoff frequency has a low-pass filter14, a time measuring circuit15, a storage computing circuit19and a current supply circuit18. The time measuring circuit15computes the pulse number of a reference clocking signal. The storage computing circuit19obtains the mean value of first and second set values that correspond to current values of the control current when the pulse number of the reference clocking signal increases by 1, and the current supply circuit18supplies a control current equivalent to the mean value to the low-pass filter14. Therefore, even if the same pulse number is computed more than once, the desired current set value can be obtained from the mean value of the first and the second set values, and a control current amount that corresponds to said current set value can be supplied. Consequently, even if the frequency of the reference clocking signal is low, the cutoff frequency can be finely set by finely setting the value of the control current.
REFERENCES:
patent: 5506542 (1996-04-01), Hamano et al.
patent: 5703852 (1997-12-01), Kumagai
patent: 6675314 (2004-01-01), Yamada et al.
Brady W. James
Browne Lynne H.
Chen Tse
Kempler William B
Telecky , Jr. Frederick J.
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