Information processing apparatus with missing pulse detection and correction
AssigneeKabushiki Kaisha Toshiba
InventorMakoto Katumata
Life of this patent
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Abstract
An apparatus is provided for a disc-shaped information recording medium having a plurality of information recording tracks formed thereon with substantially equal distances therebetween in the spiral or concentric fashion. The apparatus further includes a recording/reproducing head for recording and reproducing information on and from the information recording tracks. The apparatus is capable of detecting information from the medium when the head is moved in the radial direction of the medium. A track detection pulse signal is extracted from the information detected by the apparatus when the head is moved in the radial direction. If a pulse is missing, the apparatus generates a pulse signal corresponding to the missing pulse, corrects the analog signal, and synthesizes a new signal.
Claims8
An information processing apparatus for a disc-shaped information recording medium having a plurality of information recording tracks formed thereon with substantially equal distance therebetween in a spiral or concentric fashion, comprising:
- recording/reproducing means for recording and reproducing information on and from said information recording track;
- means for moving said recording/reproducing means at substantially a constant speed in a radial direction with respect to said medium;
- detecting means for detecting information from said medium when said recording/reproducing means is moved in said radial direction of said medium;
- track detection pulse signal extracting means for extracting an analog signal from the information detected by said detecting means when said recording/reproducing means is moved in said radial direction, said extracted analog signal being a series of pulses indicating each time said recording/reproducing means crosses one of said tracks;
- speed signal generating means responsive to said analog signal from said track detection pulse signal extracting means for generating a speed signal corresponding to the radial speed of said recording/reproducing means;
- missing pulse detecting means for detecting a missing pulse in the analog signal, wherein said missing pulse detecting means responds to the pulses of said analog signal from said track detection pulse signal extracting means and responds to the speed signal from said speed signal generating means to detect said missing pulse by an output signal;
- pulse generating means for generating a digital pulse signal corresponding to the missing pulse, wherein said pulse generating means receives the output signal from said missing pulse detecting means to generate said pulse signal corresponding to the missing pulse;
- and
- correcting means for synthesizing a new analog signal from the extracted analog signal and the pulse signal generated by said pulse generating means.
An information processing apparatus for a disc-shaped information recording medium having a plurality of information tracks formed thereon with substantially equal distance therebetween in a spiral or concentric fashion comprising:
- means for receiving a reflection beam from the information tracks;
- means for moving said receiving means at substantially a constant speed in a radial direction with respect to said medium;
- means for outputting a reproducing signal corresponding to the reflection beam from said medium when said receiving means is moved in the radial direction of said medium, the reproducing signal including a high frequency component corresponding to noise and an amplitude distortion portion corresponding to a reflection coefficient different from the normal portions;
- means for removing the high frequency component from the reproducing signal;
- means for standardizing the amplitude distortion portion of the reproducing signal;
- and
- means for extracting a track signal from the reproducing signal as modified by said removing means and said standardizing means, the track signal being a series of pulses indicating each time said receiving means crosses one of the information tracks;
- speed signal generating means responsive to the track signal from said extracting means for generating a speed signal corresponding to the radial speed of said receiving means;
- means for detecting a missing pulse in the track signal;
- pulse generating means for generating a digital pulse signal corresponding to the missing pulse, and
- correcting means for synthesizing a new track signal from the extracted track signal and the digital pulse signal generated by said pulse generating means.
Dependencies are inferred from the claim text.