Abstract A new additional information generating section (12) generates new additional information FS1 based upon information from an additional information reading section (11). The spectrum of the new additional information FS1 is spread by an SS additional information generating section (14) and supplied to a signal superimposing section (15) as SS additional information SF1. The signal superimposing section (15) generates a digital video signal S2 by superimposing the SS additional information SF1 on a digital video signal S1. A writing section (16) records the digital video signal S2 on which the SS additional information SF1 is superimposed on a recording medium (100). Hereby, adding additional information to an information signal without deteriorating the quality of the read information signal so that the falsification and deletion are disabled, detecting the additional information added to the information signal if necessary and utilizing it are enabled. <IMAGE>
An information signal processing unit,
comprising: reading means for receiving a digital information
signal on which an additional information signal the
spectrum of which is spread is superimposed and reading
said additional information signal from said information
signal; additional information signal generating means for
generating a new additional information signal based upon
said additional information signal read by said reading
means; spreading means for spreading the spectrum of said new
additional information signal generated by said additional
information signal generating means; and superimposing means for superimposing said new
additional information signal the spectrum of which is
spread by said spreading means on said information signal
and outputting it.
Claim 2
Dependent Claim
24 words
An information signal processing unit as claimed
in Claim 1, wherein: recording means for recording an output signal from
said superimposing means is provided.
Claim 3
Dependent Claim
141 words
An information signal processing unit,
comprising: additional information signal detecting means for
receiving a digital information signal to which a first
additional information signal and a second additional
information signal are added and detecting said first
additional information signal and said second additional
information signal from said information signal; first additional information signal generating means
for generating a first new additional information signal
based upon said first additional information signal
detected by said additional information signal detecting
means; second additional information signal generating means
for generating a second new additional information signal
based upon said first new additional information signal and
said second additional information signal; addition means for adding said second new additional
information signal to said information signal; and superimposing means for superimposing said first new
additional information signal on said second additional
information signal from said addition means.
Claim 4
Dependent Claim
40 words
An information signal processing unit as claimed
in Claim 3, wherein: the spectrum of said first additional information
signal is spread; and said first additional information signal is detected
by reducing the spectrum by said additional information
signal detecting means.
Claim 5
Dependent Claim
51 words
An information signal processing unit as claimed
in Claim 3 or 4, comprising: spreading means for spreading the spectrum of said
first new additional information signal, wherein: said superimposing means superposes said first new
additional information signal the spectrum of which is
spread on said information signal from said addition means.
Claim 6
Dependent Claim
25 words
An information signal processing unit as claimed
in Claim 3, 4 or 5, comprising: recording means for recording an output signal from
said superimposing means.
References Cited (Backward Citations)
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