This paper descrives the system for Hi-Vision digital transmission using a helicopter. In this system. Hi-Vision baseband signals are digitally compressed to 60Mbps. Then, It is modulated to 16QAM method and transmitted in the SHF 18 MHz bandwidth. By mounting this system onto a helicopter, live transmission of Hi-Vision aerial shots are possible. This system was used on the broadcasting of the royal wedding parade.
This paper describes characteristics of "telecine images" from the standpoint of introduction of EDTV-II, and proposes ID signals for the images. In case of the images, many problems concerned with top and bottom bars and insufficiency of progressive-scanned cameras can be solved, because interlaced-scanned signals can be completely converted into progressive-scanned signals without using vertical-temporal (VT) helper signals.
A newly developed EDTV system is presented. Wide aspect TV signals are decomposed into temporal high and low components. These components are separately encoded to letterbox format. The temporal high components are multiplexed in upper and lower portion of letterbox form signal to reproduce high quality progressive scan signal at a decoder. This system can encode both progressive and interlace scan signal using temporal fitering technique We also developed interference reduction techniques for existing TV receivers.
This paper describes experimental hardware of letter-box EDTV. In this system, LD (vertical-temporal helper) signal with 360lph dynamic vertical resolution and VT (vertical helper) signal with 480lph Static vertical resolution are multiplexed on different spaces in vertical-temporal frequancy domain, and transmitted in the top and bottom panel, Hence, the multiplexed Signals can be separated perfectly on EDTV receivers.
The Broadcast Technology Association (BTA) has been deliberating on the target of 1995 for the implementation of the second-generation EDTV (EDTV-II), a major purpose of which is wide-aspect terrestrial broadcasting. Over the last five years,the NIPPON Television NETWORK corporation (NTV) which is the first commercial television station in Japan has been conducting experiments with prototype hardware and contributing to the discussion on EDTV-II as a member of BTA. HERE, I report about vertical enhanceme nt technology for provisional format based on this hardware.
This paper proposes a multiplexing scheme of VT (Vertical-Temporal) and VH (Vertical High) helper signals on EDTV-II. In the scheme, both signals are multiplexed on different spaces in vertical-temporal frequency domain, thus they can be separated perfectly on EDTV-II receivers. The multiplexed signals are modulated horizontally by fsc (color sub-carrier), and any synchronization error does not take place on receivers. Subjective assessment tests clarified that the proposed scheme is most appropriate from a viewpoint of impairment to current receivers.
Interference reducing method for EDTV-II is described. This method uses the correlation between the main signal transmitted on the main panel and the VT (Vertical-Temporal high frequency) signal transmitted on the upper and lower panels. In this paper we applied this method to LD (Line Difference) signal generated by SSKF (Symmetric Short Kernel Filter). We confirmed the effect of this method and made the encoder and the decoder which realized this method.
The signalling system for EDTV-II, which is now under study in BTA, is reviewed. It has three functions, i.e., (1) command function to indicate the status of video signals, (2) reference function to send the level and phase information of enhancement signals, and (3) discrimination function to discriminate the signalling signal from the existing video signals. The third contains the most time-consuming and knotty problems.
An ITU Workshop took place from 3-5 October 1993 in Auckland. New Zealand. In brief, two wide-screen enhanced systems are being developed in the world: EDTV II and PAL plus. Both systems are letterbox format with a vertical helper signal to increase vertical resolution. However, whilst PAL plus uses colour plus to improve cross-colour and cross-luminance, and a vertical higher resolusion helper, EDTV II uses an horizontal enhancement system by spectrum folding, and a vertical higher resolusion helper and a vertical/temporal helper.