DC offset removing circuit for magneto-optical recording medium

Details DC offset removing circuit for magneto-optical recording medium DC offset removing circuit for magneto-optical recording medium

1998-02-23

2000-10-03

Neyzari, Ali

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 59, 369 32, G11B 700

Patent

active

061282669

ABSTRACT:
The objective of the invention is to provide a type of offset elimination circuit that can reliably remove the ripple error. The offset elimination circuit comprises the following circuits: comparator 11 which generates square-wave data signal S11 corresponding to the rising and falling edges of the differential signal from the reproduction differential signal; shift registers 17-19 which latch gate signal GT activated only during processing of the aforementioned VFO region in synchronization with the aforementioned square-wave data signal, and sequentially shift the aforementioned gate signal in synchronization with said square-wave data signal S11; charge pump circuit 12 which receives first gate signal S17 latched by the aforementioned shift registers and generates sawtooth data signal S12 corresponding to the level of square-wave data signal S11 output from said comparator 11; sample-and-hold circuit 13 which receives second gate signal S18 shifted to the rear section with respect to first gate signal S17 of the aforementioned shift register and performs the hold operation for output signal S12 of said charge pump circuit 12; and adder 16 which adds the output signal of the aforementioned sample-and-hold circuit to the aforementioned reproduced differential signal.

REFERENCES:
patent: 5684772 (1997-11-01), Yamagami et al.
patent: 5831562 (1998-11-01), Van Auken et al.
patent: 5838512 (1998-11-01), Okazaki

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