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AssigneeSony Corporation
InventorsKyoya Tsutsui, Naoya Haneda, Kenzo Akagiri
Estimating the term…
It is intended to remove a risk of illegal high quality restoration while enabling trial viewing of contents such as music, to make it possible to reproduce contents with high quality by acquiring a relatively small amount of data, and to make it possible to implement hardware at a lower cost. To generate trial listening data containing dummy data, a pseudo random number R is generated first. A remainder r of R divided by 128 is calculated. The remainder r is coded and incorporated into high sound quality restoration data. A bandwidth limitation region of trial listening data is replaced by dummy data starting from its rth bit. As a result, the head position of the dummy data in the trial listening data varies frame by frame, whereby the safety of the trial listening data can be increased.
A signal reproducing method for reproducing a code sequence obtained by coding a signal in prescribed units, comprising:
A signal reproducing device for reproducing a code sequence obtained by coding a signal in prescribed units, comprising:
A signal recording method for recording, on a recording medium, a code sequence obtained by coding a signal in prescribed units, comprising:
A signal recording device for recording, on a recording medium, a code sequence obtained by coding a signal in prescribed units, comprising:
A code sequence generating method comprising:
A code sequence generating device comprising:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
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Signal processing not specific to the method of recording or reproducing; Circuits therefor: circuits for prevention of unauthorised reproduction…
Optical discs: dVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
Information storage based on relative movement between record carrier and transducer
Term end not estimated
1. Field of the Invention
The present invention relates to a signal reproducing method and device, a signal recording method and device, and a code sequence generating method and device. For example, the invention relates to a signal reproducing method and device, a signal recording method and device, and a code sequence generating method and device for coding a signal so as to enable trial viewing and, if a trial viewer decides to buy an item concerned, enabling high-quality reproduction and recording by adding data having a small amount of information.
2. Description of the Related Art
FIG. 1 is a block diagram showing the general configuration of an optical disc recording and reproducing apparatus to be used for the description of a first embodiment of the present invention;
FIG. 2 is a block diagram showing the general configuration of an exemplary coding device to be used for the description of the first embodiment of the invention;
FIG. 3 is a block diagram showing a specific example of a converting means of the coding device of FIG. 2;
First Embodiment
Before description of a first embodiment, an optical disc recording and reproducing apparatus as a general compressed data recording and reproducing apparatus to be used for the description of the first embodiment will be described with reference to drawings.
FIG. 1 is a block diagram of an exemplary optical disc recording and reproducing apparatus. In the apparatus of FIG. 1, a magneto-optical disc 1 that is rotationally driven by a spindle motor 51 is used as a recording medium. To record data on the magneto-optical disc 1, a modulated magnetic field corresponding to recording data is applied to the disc 1 by a magnetic head 54 in a state that laser light is applied to the disc 1 by an optical head 53, whereby data are recorded along the recording track of the magneto-optical disc 1 by what is called magnetic-field-modulated recording. To reproduce recorded data, the recording track of the magneto-optical disc 1 is traced by laser light that is emitted from the optical head 53 (magneto-optical reproduction).