Television – Format – Specified color signal format
Reexamination Certificate
1999-02-09
2001-05-01
Kostak, Victor R. (Department: 2611)
Television
Format
Specified color signal format
C348S386100
Reexamination Certificate
active
06226043
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a video signal transmission technique, and is more specifically directed to such a video signal transmission technique for multiplexing digital R, G, B signals corresponding to video output signals to output the multiplexed digital R, G, B video signals.
2. Description of the Related Art
Conventionally, as video signal transmitting apparatuses, for example, Japanese Unexamined Patent Application No. 04-013392 opened in 1992 discloses the video transmitting apparatus (related art 1), and Japanese Unexamined Patent Application No. 04-355589 opened in 1992 describes the color video signal transmission method and the color video signals transmitting/receiving apparatus (related art 2). In the video transmitting apparatus of related art 1, the broad-band analog R, G, B signals are multiplexed in the 3-phase time divisional manner, and then the multiplexed broad-band analog R, G, B signals are transmitted via a single optical fiber. In the color video signals transmitting/receiving apparatus of related art 1, the digital video signal which has been multiplex-modulated in the time divisional manner by the video signal transmitting apparatus is transmitted via a single transmission cable to the video signal receiving apparatus.
As previously explained, when the respective signal components of the R, G, B video signals are multiplexed in the time divisional manner and the multiplexed R, G, B video signals are transmitted, these video signals can be transmitted by employing a single transmitting means. For instance, in the case that each of digital R, G, B video signals is D/A-converted into each of analog R, G, B video signals to be outputted, since these analog R, G, B video signals are multiplexed in the time divisional manner, a total number of D/A converters and a total path number of signal transmission paths can be reduced from 3 to 1.
In these conventional video signal transmitting and/or receiving apparatuses, since the time-division multiplexing technique is employed, the total quantities of the D/A converter and the signal transmission path can be reduced to 1, respectively. However, the timing signal used to notify the timing of the multiplexing operation must be transmitted independently from the transmissions of the three multiplexed R, G, B video signals. Therefore, such a transmitting apparatus for transmitting this timing signal is necessarily required. In other words, on the reception side where the video signals which have been D/A-converted to be transmitted are received, these multiplexed analog video signals are demultiplexed to produce a plurality of original video signals based upon the timing signal indicative of the timing of the multiplexing operation after A/D-converting the video signals.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a video signal transmission method and a video signal transmitting apparatus without transmitting a timing signal irrespective of the video signals to be transmitted. This timing signal is used to notify timing of a multiplexing operation.
To achieve the above-described object, a video signal transmission method, according to a first aspect of the present invention, is featured by that digital R (red), G (green), B (blue) video signals are multiplexed in a time divisional manner, and while the respective digital R, G, B video signals are multiplexed, a synchronization corresponding signal is inserted into said digital R, G, B video signals to thereby output the digital R, G, B video signals with the synchronization corresponding signal.
With employment of the above-described arrangement, in accordance with the video signal transmitting apparatus, the synchronization corresponding signals are transmitted which are contained in the respective R, G, B digital video signals multiplexed in the time divisional manner. As a result, the timing signal used to notify the timing of the multiplexing operation is no longer transmitted irrespective of the digital R, G, B video signals to be transmitted.
Also, to achieve the above-described object, a video signal transmitting apparatus, according to a second aspect of the present invention, is characterized by comprising multiplexing means for multiplexing digital R (red), G (green), B (blue) video signals in a time divisional manner, and for inserting a synchronization corresponding signal into the digital R, G, B video signals during the multiplexing operation to thereby output the digital R, G, B video signals within the synchronization corresponding signal.
REFERENCES:
patent: 3492415 (1970-01-01), Okada et al.
patent: 51-85627 (1976-07-01), None
patent: 54-138342 (1979-10-01), None
patent: 61-67090 (1986-04-01), None
patent: 62-56092 (1987-03-01), None
patent: 63-76692 (1988-04-01), None
patent: 64-77287 (1989-03-01), None
patent: 4-13392 (1992-01-01), None
patent: 4-355589 (1992-12-01), None
Japanese Office Action, dated Sep. 26, 2000, with English language translation of Japanese Examiner's comments.
Kostak Victor R.
McGuireWoods LLP
NEC Corporation
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