Dynamic magnetic information storage or retrieval – General recording or reproducing – Recording-or erasing-prevention
Reexamination Certificate
1998-02-27
2001-03-20
Kim, W. Chris (Department: 2651)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Recording-or erasing-prevention
C360S027000
Reexamination Certificate
active
06204981
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a method for identifying additional information for identifying a spectrally spread additional information superimposed on an information signal and a device for identifying a spectrally spread additional information superimposed on an information signal and for processing the information signal based on an identification result.
2. Description of Related Art
In the case that copyright of a producer is set in an information stored in a recording medium such as a magnetic tape or magnetic disk, duplication of such an information is prevented. Heretofore, processing of an information signal has been controlled in order to prevent duplication of the stored information in a recording medium by way of a method in which a spectrally spread specific additional information for specifying the producer is superimposed on the stored information signal and the additional information is identified.
For example, in such case, Japanese Patent Laid-Open No. Hei 1-149259 discloses a recording medium which is capable of detecting the producer's copyright without deterioration of the original audio signal quality by way of a method in which an additional signal for identification is spectrally spread and superimposed on the audio signal over the audio band.
In such case, a conventional information write device
1
shown in
FIG. 1
which uses an additional information as an anti-duplication signal in order to prevent duplication is provided with a write section
2
for writing in a recording medium and an additional information signal detection section
3
connected to an input terminal t
1
in parallel. A write control section
5
for controlling operation of the write section
2
is connected to the additional information signal detection section
3
. The write control section
5
is connected to the write section
2
, and a recording medium
6
in which an information signal is to be written through an output terminal t
2
is connected to the write section
2
.
In this conventional information write device
1
, an anti-duplication signal has been added as an additional information signal on an information signal f
1
supplied from the original recording medium, the information signal f
1
is inputted to the write section
2
and the additional information signal detection section
3
, and the additional information signal detection section
3
detects a spectrally spread additional information signal f
2
superimposed on the information signal f
1
. Upon receiving the additional information signal f
2
which the additional information signal detection section
3
detected, the write control section
5
supplies a write inhibition signal f
3
to the write section
2
.
The write section
2
where the information signal f
1
is inputted writes the information signal f
1
in the recording medium
6
if no write inhibition signal f
3
is inputted from the write control section
5
, and on the other hand, the write section
2
does not write the information signal f
1
in the recording medium
6
and write operation is inhibited if a write inhibition signal f
3
is supplied by the write control section
5
.
In the above-mentioned conventional information write device
1
, if an additional information f
2
is superimposed on an information signal f
1
from an original recording medium as described above, writing of the information signal f
1
in recording media
6
is inhibited and duplication is prevented.
However, the conventional information write device
1
requires a long time to decode and detect the additional information, and is poor in detection accuracy of the additional information, and a high spread gain of spectral spread is required to ensure the detection. These conditions are disadvantageous.
The present invention is accomplished in view of the above-mentioned current problems of the additional information detection spectrally spread and superimposed on the information signal. The first purpose of the present invention is to provide a method for identifying an additional information which is capable of detecting an additional information spectrally spread and superimposed on the information signal with a small spread gain, within a short time, and with a good detection accuracy.
The second purpose of the present invention is to provide a device for identifying an additional information which is capable of detecting an additional information spectrally spread and superimposed on the information signal with a small spread gain, within a short time, and with a good detection accuracy, and performing processing of the information signal properly based on a detection result.
SUMMARY OF THE INVENTION
The method for superimposing and detecting an additional information signal, in which an information signal is generated by superimposing the additional information signal on the main information signal and the additional information signal is detected, comprises a step for superimposing repeatedly a plurality of times a spectrally spread additional information on the main information signal in order to generate the information signal, a step for performing inversion spectral spread on the information signal using the spectrally spread code in order to detect the additional information signal the plurality of times, and a step for judging the superimposition of the additional information signal on the information signal if the plurality of detection results of the additional information signal are coincident.
The device for superimposing and detecting an additional information signal, which generates an information signal by superimposing the additional information signal on the main information signal and detects the additional information signal, is provided with an information signal generation means for superimposing repeatedly a plurality of times a spectrally spread additional information on the main information signal in order to generate the information signal, a detection means for performing inversion spectral spread on the information signal using the spectrally spread code in order to detect the additional information signal the plurality of times, and a coincidence detection means for generating a coincidence signal if the plurality of detection results of the additional information signal are coincident.
The information signal recording control device for controlling the recording of an information signal in a recording medium is provided with a detection means for inversion spectrally spreading using the spectrally spread code the information signal generated by superimposing a spectrally spread additional information signal repeatedly a plurality of times on the main information signal in order to detect the additional information signal the plurality of times, a coincidence detection means for generating a coincidence signal if the plurality of detection results of the additional information signal is coincident, and a write control means for controlling the recording of the information signal in a recording medium dependently on the coincidence signal supplied from the coincidence detection means.
REFERENCES:
patent: 5073925 (1991-12-01), Nagata et al.
patent: 5243423 (1993-09-01), Ogura et al.
patent: 5719937 (1998-02-01), Warren et al.
patent: 5960398 (1999-09-01), Fuchigami et al.
patent: 5963909 (1999-10-01), Warren et al.
patent: 0360615 (1990-03-01), None
patent: 0400906 (1990-12-01), None
Ikeda Nozomu
Ogino Akira
Kim W. Chris
Maioli Jay H.
Sony Corporation
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