Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Reexamination Certificate
1996-10-24
2001-04-24
Nguyen, Hoa T. (Department: 2753)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
C360S046000, C375S232000
Reexamination Certificate
active
06222694
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a reproduction apparatus such as a digital VTR for reproducing information from a magnetic recording medium on which information such as a video signal is digitally recorded and, more particularly, to a method of eliminating decoding errors.
2. Related Background Art
In a general digital VTR, error correction codes and the like are added to encoded data obtained by encoding an input signal in a recording mode, and the sum data are digitally modulated. Then, the modulated data is recorded on a recording medium such as a magnetic tape.
In a reproduction, a reproduced output obtained from the recording medium on which the data is recorded, as described above, via a magnetic head is amplified, and thereafter, the amplified data is reproduction-equalized. Then, processing such as digital demodulation, error correction, decoding, and the like is executed based on the equalized output.
In a digital VTR having the above-mentioned recording/reproduction system, the above-mentioned reproduction amplifier and the reproduction equalization have not been sufficiently examined yet as compared to data encoding/decoding and digital demodulation of a reproduced signal.
SUMMARY OF THE INVENTION
The present invention has been made in consideration of the above situation, and has as its object to provide a reproduction apparatus which can lower the error rate by improving a reproduction system.
According to a first embodiment of the invention, head amplifier control means for controlling the resonance characteristics of a head amplifier on the basis of an error detection signal obtained from error correction decoding means is arranged.
According to a second embodiment of the invention, reproduction equalizer control means for controlling the frequency characteristics of a reproduction equalizer on the basis of an error detection signal obtained from error correction decoding means is arranged.
According to a third embodiment of the invention, phase equalizer control means for controlling the phase characteristics of a phase equalizer on the basis of an error detection signal obtained from error correction decoding means is arranged.
According to a fourth embodiment of the invention, a synchronization phase control circuit for controlling the synchronization phase of reproduced data and a clock signal on the basis of an error detection signal obtained from error correction decoding means is arranged.
According to the first embodiment, the resonance characteristics of the head amplifier are controlled via the head amplifier control means so as to minimize the occurrence frequency of an error detection signal obtained from the error correction decoding means, thereby eliminating errors included in reproduced data before error correction.
According to the second embodiment, the frequency characteristics of the reproduction equalizer are controlled via the reproduction equalizer control means so as to minimize the occurrence frequency of an error detection signal obtained from the error correction decoding means, thereby eliminating errors included in reproduced data before error correction.
According to the third embodiment, the phase characteristics of the phase equalizer are controlled via the phase equalizer control means so as to minimize the occurrence frequency of an error detection signal obtained from the error correction decoding means, thereby eliminating errors included in reproduced data before error correction.
According to the fourth embodiment, the synchronization phase of reproduced data and a clock signal is controlled by the synchronization phase control circuit so as to minimize the occurrence frequency of an error detection signal obtained from the error correction decoding means, thereby eliminating errors included in reproduced data before error correction.
Other objects and features of the present invention will become apparent from the following specification and drawings.
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Canon Kabushiki Kaisha
Morgan & Finnegan , LLP
Neal Regina Y.
Nguyen Hoa T.
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