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| Data recording apparatus |
| It is an object of the present invention to provide a data recording apparatus which can solve the ... |
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| Digital transmission signal processing system and recording/reproducing system |
| An object of the present invention is to provide a digital VTR in which high-speed recording onto a ... |
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| Video signal processing apparatus |
| As described, when a configuration in which both analog and digital recording/reproducing ... |
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| Continuous looping feature in transmission of HDTV signals |
| The invention resides in a continuous looping play feature in a high definition TV player capable ... |
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| Image input device |
| The present invention has been made in view of the above-noted points and an object thereof is to ... |
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| Method and system for first-order RF amplitude and bias control of a modulator |
| Therefore, a need exists for a method and system for controlling the RF amplitude and bias value of ... |
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| Apparatus for recording and/or reproducing color video signals |
| Accordingly, it is an object of this invention to provide an apparatus for recording and/or ... |
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Auxiliary signal to assist conversion of a letterbox standard aspect ratio television signal to a wide aspect ratio signal
| Details |
Inventors: Geiger, Erich; Platte, Hans-Joachim; Plantholt, Martin; Westerkamp, Dietrich; Riemann, Uwe; Hepper, Dietmar;
Assignee: Deutsche Thomson-Brandt GmbH (DE)
Primary Examiner: Groody; James J.
Assistant Examiner: Metjahic; Safet
Attorney, Agent or Firm: Tripoli; Joseph S., Herrmann; Eric P., Kurdyla; Ronald H.
In the process of generating a compatible 4:3 letterbox format television signal, a wide aspect ration 16:9 progressive scan television signal is vertically transcoded from 575 to 431 image lines, converted to line interlaced form and horizontally compressed. A vertically transcoded interlaced luminance component is converted back to progressive scan form via interpolation, and subtracted from a vertically transcoded original progressive scan luminance component to produce a difference (helper) signal. The difference signal is time compressed and multiplexed into upper and lower edge bar regions of the letterbox format. The compatible letterbox signal also is encoded with additional information including vertical high frequency information and horizontal high frequency information separated during the transcoding and compression processes, respectively. The encoding includes modulating the color subcarrier frequency with luminance information, and intraframe averaging. The difference signal and encoded additional information are used by a 16:9 widescreen receiver to produce a 16:9 progressive scan image display with the transcoded number of lines and good resolution. |
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DETAILED DESCRIPTION A system according to the present invention comprises a compatatible television signal processing system for a 16:9 television signal which in standard 4:3 aspect ratio receivers provides images in the letterbox format, and in improved receivers provides images in full 16:9 progressive scan format with horizontal resolution corresponding to that of the source signal.
In an illustrated embodiment, at a transmitter, a progressive scan television signal with a 16:9 image aspect ratio (format) and with 575 active image lines is digitized transcoded vertically to 431 active lines, converted into a line interlaced signal, provided with additional enhancement information and transmitted as a compatible television signal in the known letterbox format.
The additional information comprises signal components which help to develop, from the interlace signal, a progressive scan signal with vertical resolution approximating that of the source signal (as discussed, for example, in German patent 3912470), vertical high frequency components which are separated in the transcoding process at the transmitter (as discussed, for example, in German patent 3926388), and high horizontal high frequency components which are separated in the process of horizontal compression when converting from 16:9 to the 4:3 format (as discussed, for example, in German patent 3926388).
In contrast to the process described in German patent 39122470, the additional information used in the system according to the present invention is not generated for recovering a progressive television signal with 575 active lines with an identical image format, but rather for recovering a progressive television signal which has been transcoded to 431 lines and which has had its picture format changed for transmission.
The additional information can be transmitted in upper and lower bar regions as well as in the vertical blanking interval (as discussed in German patent 3912470), and also by modulating the color carrier frequency (as discussed in German patent 39226388)
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TV Signal 
