Information reproducing apparatus and method, and computer program
AssigneePioneer Corporation
InventorsYoshio Sasaki, Shogo Miyanabe, Hiroyuki Uchino
Life of this patent
Estimating the term…
Abstract
An information reproducing apparatus (1) is provided with: a correcting device (18) for correcting waveform distortion occurring in a read signal corresponding to a long mark, of read signal (RRF) read from a recording medium (100); an amplitude limiting device (182) for limiting an amplitude level of the read signal in which the waveform distortion is corrected, by a predetermined amplitude limit value (L, −L), thereby obtaining an amplitude limit signal; and a filtering device (183) for performing a high-frequency emphasis filtering process on the amplitude limit signal, thereby obtaining an equalization-corrected signal.
Claims18
An information reproducing apparatus comprising:
- a correcting device for correcting waveform distortion occurring in a read signal corresponding to at least a long mark, of a read signal read from a recording medium;
- an amplitude limiting device for limiting an amplitude level of the read signal in which the waveform distortion is corrected, by a predetermined amplitude limit value, thereby obtaining an amplitude limit signal;
- and a filtering device for performing a high-frequency emphasis filtering process on the amplitude limit signal, thereby obtaining an equalization-corrected signal,
- wherein said correcting device corrects the waveform distortion by correcting a signal component of the read signal, the signal component is between a time point after a lapse of at least a time corresponding to a data length of record data with the shortest run length from a first reference cross point and a time point of reaching a second reference cross point located next to the first reference cross point due to the lapse of at least the time corresponding to the data length of the record data with the shortest run length.
An information reproducing method comprising:
- a correcting process of correcting waveform distortion occurring in a read signal corresponding to at least a long mark, of a read signal read from a recording medium;
- an amplitude limiting process of limiting an amplitude level of the read signal in which the waveform distortion is corrected, by a predetermined amplitude limit value, thereby obtaining an amplitude limit signal;
- and a filtering process of performing a high-frequency emphasis filtering process on the amplitude limit signal, thereby obtaining an equalization-corrected signal,
- wherein said correcting process corrects the waveform distortion by correcting a signal component of the read signal, the signal component is between a time point after a lapse of at least a time corresponding to a data length of record data with the shortest run length from a first reference cross point and a time point of reaching a second reference cross point located next to the first reference cross point due to the lapse of at least the time corresponding to the data length of the record data with the shortest run length.
A computer readable recording medium recording thereon, in a non-transitory state, a computer program for reproduction control and for controlling a computer provided in an information reproducing apparatus comprising:
- a correcting device for correcting waveform distortion occurring in a read signal corresponding to at least a long mark, of a read signal read from a recording medium;
- an amplitude limiting device for limiting an amplitude level of the read signal in which the waveform distortion is corrected, by a predetermined amplitude limit value, thereby obtaining an amplitude limit signal;
- and a filtering device for performing a high-frequency emphasis filtering process on the amplitude limit signal, thereby obtaining an equalization-corrected signal, said correcting device corrects the waveform distortion by correcting a signal component of the read signal, the signal component is between a time point after a lapse of at least a time corresponding to a data length of record data with the shortest run length from a first reference cross point and a time point of reaching a second reference cross point located next to the first reference cross point due to the lapse of at least the time corresponding to the data length of the record data with the shortest run length,
- said computer program making the computer function as at least one portion of said correcting device, said amplitude limiting device, and said filtering device.
Dependencies are inferred from the claim text.