EP0530669A2
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Encoder/decoder for information signal
Assignee: Nippon Television Network Corp
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Filing: 1992-08-27
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Granted: —
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Expires: 2012-08-27
Abstract
Abstract An encoder/decoder can insert and demodulate an information signal without affecting a video signal, the information signal being not analyzed, modified and deleted easily. The non-inverted and inverted information signals are inserted into two horizontal lines having a strong correlation in the same field or different fields separated by at least one field of the video signal. A difference of the inserted information signals is obtained by a combination of a delay circuit and a subtracter. Field difference signals Sx and Sy are applied to a band pass filter and are generated by a PSK generation circuit. Generated output signals Qx and Qy are converted into unit information by a majority decision logic circuit and are stored in a memory. A unit information group consisting of a predetermined number of stored bits is used to generate the meaningful information. The inserted information signal has a low level and is inserted in the video period and the unit information is generated by the field difference. Thus, the information signal cannot be analyzed, modified and deleted easily.
Inventors
- 👤 Akihiro Hori
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 18:38
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/081
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
35 words
An encoder for an information signal characterized in that a special information signal is inserted into a video signal except a blanking interval, said special information signal being not used as an image forming information.
Claim 2
Dependent Claim
37 words
An encoder for an information signal according to claim 1, wherein the non-inverted and inverted information signals are inserted into two horizontal lines having a strong line correlation during the video signal period in the same field.
Claim 3
Dependent Claim
50 words
An encoder for an information signal according to claim 1, wherein the non-inverted and inverted information signals are inserted into two horizontal lines of different fields separated by at least one field of the video signal, said two horizontal lines having a strong line correlation during the video signal period.
Claim 4
Dependent Claim
78 words
An encoder for an information signal according to claim 1, wherein the non-inverted and inverted information signals are inserted into two horizontal lines having a strong line correlation during the video signal period in the same field, and the non-inverted and inverted information signals are further inserted into two horizontal lines of different fields separated by at least one field of the video signal, said two horizontal lines having the strong line correlation during the video signal period.
Claim 5
Dependent Claim
34 words
An encoder for an information signal characterized in that the information signal is inserted into one of two horizontal lines having a strong line correlation during a video signal period in the same field.
Claim 6
Dependent Claim
49 words
An encoder for an information signal according to claim 5, wherein the information signals are inserted into one of two horizontal lines of different fields separated by at least one field of the video signal, said two horizontal lines having a strong line correlation during the video signal period.
Claim 7
Dependent Claim
84 words
An encoder for an information signal according to claim 5, wherein the information signals are inserted into one of two horizontal lines having a strong line correlation during the video signal period in the same field, and the information signal is further inserted into the strong correlation horizontal line in a field that is separated from the field of the two horizontal lines by at least one field, the strong correlation horizontal line being adjacent to the other one of the two horizontal lines.
Claim 8
Dependent Claim
28 words
An encoder for an information signal according to claim 1 and 5, wherein the insertion level at a moving image is larger than that at a still image.
Claim 9
Dependent Claim
43 words
A decoder for an information signal characterized in that a special information signal is separated and extracted from a video signal to generate the special information, the special information signal being non-image forming information inserted into a video signal except a blanking interval.
Claim 10
Dependent Claim
60 words
A decoder for an information signal according to claim 9, wherein the information signal to be detected is non-inverted and inverted information signals inserted into two horizontal lines having a strong line correlation in the same field of the video signal, and the special information signal is generated by obtaining a difference between the information signals on the two lines.
Claim 11
Dependent Claim
69 words
A decoder for an information signal according to claim 9, wherein the information signal to be detected is non-inverted and inverted information signals inserted into two horizontal lines of different fields separated by at least one field of the video signal, said two horizontal lines having a strong line correlation, and the special information is generated by obtaining a line difference of these information signals on the two lines.
Claim 12
Dependent Claim
91 words
A decoder for an information signal according to claim 9, wherein the information signal to be detected is non-inverted and inverted information signals inserted into two horizontal lines having a strong line correlation in the same field of the video signal and inserted into two horizontal lines of different fields separated by at least one field of the video signal, said two horizontal lines having a strong line correlation, and the special information is generated by obtaining a line difference of the same field and a line difference of different fields.
Claim 13
Dependent Claim
48 words
A decoder for an information signal characterized by obtaining a two-line difference of the information signal inserted into one of two horizontal lines having a strong line correlation in the same field of a video signal period, and by generating the special information signal from the two-line difference.
Claim 14
Dependent Claim
72 words
A decoder for an information signal according to claim 13, wherein when generating the special information signal inserted into one of two horizontal lines of different fields separated by at least one field of the video signal, said fields and said two horizontal lines having a strong correlation during the video signal period, a line difference is obtained from the two horizontal lines having the strong correlation to generate the special information.
Claim 15
Dependent Claim
150 words
A decoder for an information signal according to claim 13, wherein when generating the special information inserted into one of two horizontal lines having a strong correlation in at least one filed having a strong field correlation during the video signal period and inserted into a horizontal line having a strong correlation in a field that is separated from the field of the two horizontal lines by at least one field, the latter horizontal line being adjacent to the other one of the two horizontal lines to which the information signal is not inserted, a two-line difference between the two lines having the strong correlation in the same field and a line difference between the two horizontal lines having the strong correlation in the different fields are obtained, and the special information is generated from the line difference of the same field and the line difference of the different fields.
Claim 16
Dependent Claim
37 words
A decoder for an information signal according to claims 9 and 13, wherein the insertion level of the information signal inserted into the horizontal line for a moving image is larger than that for a still image.
References Cited (Backward Citations)
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