Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-10-11
1992-09-08
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 12, 358166, H04N 704, H04N 1106, H04N 700
Patent
active
051463270
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an addition signal multiplexing apparatus for a television system which achieves a signal transmission in a way to multiplex an addition signal which enlarges an aspect ratio on vertical overscan areas of a television signal.
BACKGROUND ART
In recent times a television broadcasting system has been developed which has an enlarged screen aspect ratio of 16:9. A television signal of a wide aspect ratio is hereinafter referred to as a wide aspect signal. A viewer's sense of presence can be enhanced on a wide aspect screen.
In order to achieve a wide aspect screen, it is necessary to consider a compatibility between a current television broadcasting system (aspect ratio of 4:3) signal and a wide aspect signal. Stated in another way, a new broadcasting system needs to be developed to reproduce a wide aspect signal even if being transmitted on a current television receiver.
A new broadcasting system has been developed which divides a wide aspect screen into a center panel and side panels, transmits a center panel signal (hereinafter referred to as a center signal) and side panel signal (hereinafter referred to as side signals) in separate channels, and reproduces two channel signals on a receiving side and assembles one wide aspect ratio signal. According to the new broadcasting system, if only a center signal's panel is employed, it is possible to receive and reproduce a center signal in the channel on a current television receiver.
However, this new system requires two channels for transmitting a wide aspect signal and tuners also on the receiving side for reception in two channels.
It is accordingly an object of this invention to provide an addition signal multiplexing apparatus for a television system which can transmit center and side signals in one channel with the side channels time division multiplexed on overscan areas of the center signal.
Another object of the present invention is to provide an addition signal mulplexing apparatus for a television system which, upon the time division multiplexing of side signals on overscan areas, multiplexes the side signals on the overscan areas of those fields proceeding relative to the field of a center signal corresponding to the side signal and, when the reproduction of the side signal has been completed, starts the reproduction on the screen of the center signal corresponding to the side signal to suppress an increase of a delay memory (hardware) on a decoder side.
Another object of the present invention is to provide an addition signal multiplexing apparatus for a television system which can transmit side signal information without leakage in which, when intermittently delivered side signals are joined in a continuous form and time division multiplexed on vertical overscan areas, the side signals are processed to enable a high correlative area of the side signal to be processed at the joined point of the side signal.
SUMMARY OF THE INVENTION
The present addition signal multiplexing apparatus comprises
screen division means for allowing a first television signal representing a first screen of a first aspect ratio to be divided into a second television signal representing a second screen of a second aspect ratio smaller than the first aspect ratio and a third television signal representing a third screen which is obtained from subtracting the second screen from the first screen;
time division arranging means, supplied with the third television signal from the screen division means, for arranging third television signals into a continuous form;
delay means, supplied with the second television signal from the screen division means, for delaying the second television signal by an amount corresponding to at least one screen to control a transmission timing of the third television signal and corresponding second television signal, the delay means being adapted to start a display on the screen of the second television signal corresponding to a reproduction screen of the third television signal when the decoding of
REFERENCES:
patent: 4551754 (1985-11-01), Meise et al.
patent: 4631584 (1986-12-01), Reitmeier
patent: 4748496 (1988-05-01), Drury et al.
patent: 4839720 (1989-06-01), Isnardi
Kawai Kiyoyuki
Kimata Yoshihide
Ogawa Yoshihiko
Sugimori Yoshio
Groody James J.
Kabushiki Kaisha Toshiba
Metjahic Safet
Nippon Television Network Corporation
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