Waveform equalizer for use in a recorded information...

Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal level detecting using a reference signal

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C369S124010, C369S124150

Reexamination Certificate

active

06278675

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a waveform equalizer for use in a recording information reproducing apparatus for reproducing recording information from a recording medium.
2. Description of Related Art
To improve the S/N ratio of a read signal read out from a recording medium on which digital data has been recorded at a high density, there is a known technique to perform a waveform equalization by executing a filtering process to emphasize high frequency components for the read signal.
Although an improvement rate of the S/N ratio can be raised as a degree of emphasis of the high frequency components for the read signal is increased, there is a problem such that if the high frequency components is excessively emphasized, an intersymbol interference increases and a jitter contrarily occurs.
The invention has beem made to solve this problem and it is an object of the invention to provide a waveform equalizer which can improve an S/N ratio without causing a jitter in a read signal read out from a recording medium.
OBJECTS AND SUMMARY OF THE INVENTION
According to the invention, there is provided a waveform equalizer for obtaining an equalization correction read signal by performing a waveform equalization to a read signal read out from a recording medium, comprising: amplitude limiting means for obtaining an amplitude limitation read signal by limiting an amplitude level of the read signal by a predetermined amplitude limitation value; and a filter for outputting a signal obtained by performing a filtering process to the amplitude limitation read signal as an equalization correction read signal.


REFERENCES:
patent: 4962434 (1990-10-01), Matsuo
patent: 5126853 (1992-06-01), Mashimo et al.
patent: 5675569 (1997-10-01), Yamaguchi et al.
patent: 5999510 (1999-12-01), Enomoto
patent: 0408007 (1991-01-01), None
patent: 0414548 (1991-02-01), None
patent: 0549030 (1993-06-01), None
patent: 09044983 (1997-02-01), None
Forney et al., “Combined Equalization and Coding Using Precoding”, IEEE Communications Magazine, 29 (1991) Dec. No. 12, NY, pp. 25-34.
Hollmann, Henk D., “The General Solution of Write Equalization for RLL (d,k) Codes, 8097 IEEE Transactions on Informatioin Theory”, 37(1991) May, No. 3, NY, pp. 856-862.
Tobita et al., “Viterbi Detection of Partial Response on a Magneto-Optical Recording Channel”, 166/SPIE vol. 1663 Optical Data Storage (1992), pp. 166-173.
Search Report dated Jun. 17, 1999.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Waveform equalizer for use in a recorded information... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Waveform equalizer for use in a recorded information..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Waveform equalizer for use in a recorded information... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2509286

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.