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| Adaptive digital predistortion linearization and feed-forward correction of RF power amplifier |
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| Predistortion system and method using analog feedback loop for look-up table training |
| OF A PREFERRED EMBODIMENT The present invention provides a predistortion system and method for ... |
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| FM demodulator including tuning of a filter and detector |
| OF THE PREFERRED EMBODIMENT A demodulator circuit embodying the invention is shown in FIG. 2 and ... |
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| Satellite communication system |
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| Accessing a video message via video snapshots |
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| Multiple dwelling unit interactive audio/video distribution system |
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Method of recording and reproduction of information using a recording medium available for information overlap recording, a recording medium and a recording and reproducing apparatus using the method
| Details |
Inventors: Tsuyoshi, Toshiaki; Tsunoda, Yoshito; Fujisawa, Hiromichi;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: LaRoche; Eugene R.
Assistant Examiner: Nguyen; Tan
Attorney, Agent or Firm: Antonelli, Terry, Stout & Kraus
A recording medium is provided with a recording film having opto-magnetic characteristics formed on the substrate, with first information being recorded in advance in the form of pit strings of a phase structure. Second information is recorded over the first information through the application of a magnetic field with polarities corresponding to the second information in the presence of the irradiation of a high-power radiation beam, without damaging the record of the first information. The first and second information are produced independently and simultaneously with a single spot in the same area by use of different signal reproduction mechanisms for the first information and second information. The first information (ROM information) is reproduced as the variation in the amount (intensity) of the reflected light from the opto-magnetic recording film, and the second information (RAM information) is reproduced by detecting the rotational angle of the reflected light, based on the Kerr effect, from the opto-magnetic film concurrently with the reproduction of the first information using a single spot. |
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DETAILED DESCRIPTION An object of the present invention is to provide an information recording medium which can store first information (ROM information) which is recorded at manufacturing and second information (RAM information) which is recorded arbitrarily by the user in the same spatial area.
Another object of the present invention is provide an information recording medium which can store information in a double density at maximum and can reproduce first and second informations concurrently with one spot.
A further object of the present invention is to provide a method of recording and reproduction capable of overlap(multiplex)-recording, on the above-mentioned recording medium, second information arbitrarily over first information without damaging the record of the first information, and capable of reproducing the first and second informations concurrently with one spot without incurring the interference.
A further object of the present invention is to provide a recording and reproduction apparatus capable of overlap-recording, on the above-mentioned recording medium, second information over first information without damaging the record of the first information, and reproducing the first and second informations concurrently with one spot.
According to one aspect of the present invention, an information recording medium is in the structure which comprises a transparent substrate on which, at least on one side thereof, first information is prerecorded as pit strings or trains of a phase structure (i.
e.
, of an embossment structure), and a recording film having opto-magnetic characteristics formed on the above-mentioned side of the substrate for recording second information through the application of a magnetic field with polarities corresponding to the second information in the presence of the irradiation of a high-power radiation beam, so that at least part of the first information and at least part of the second information are recorded in an overlap relation in the same spatial area
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