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1. WO1991006179 - PROCEDE ET APPAREIL SERVANT A AMELIORER LE RAPPORT SIGNAL-BRUIT DANS UN TELECINEMA

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WHAT IS CLAIMED IS:
1. An apparatus including transport means (10) for transporting film at variable speeds through a film gate (14), illumination means (20, 22, 24) for passing light through said film gate and focusing said light onto at least one light sensing device (28r, 28g, 28b), and speed selection means (44) for selecting a desired film transport speed and generating an output signal indicative thereof; characterized in that said apparatus further
includes:
control means (42) responsive to said output signal for controlling the operation of said transport means (10) and the light output of said illumination means (20, 22, 24), wherein said light sensing device (28r, 28g, 28b) is operated at full well potential in a first mode of operation and said light sensing device (28r, 28g, '28b) is operated at partial well potential in a second mode of
operation.
2. An apparatus as claimed in claim 1, further comprising signal processing means (50) coupled to said light sensitive sensor (28r, 28g, 28b) for converting signals received therefrom into a desired video signal.
3. An apparatus as claimed in claim 2, wherein said first operating mode is a conversion mode and said second operating mode is a shuttle mode.
4. An apparatus as claimed in claim 3, wherein said light sensing device is operated at full well potential during the conversion mode and at half well potential during the shuttle mode.

at half well potential during the shuttle mode.
5. An apparatus as claimed in claim 4, further comprising video recording means (54) for recording said video signal when said light sensing device is operated in said conversion mode of operation.
6. A method of controlling a telecine machine comprising:
passing light generated from a variable light source (20) through a film gate (14) and focusing said light onto a light sensing device (28r, 28g, 28b);
selecting a desired film transport speed and generating an output signal indicative thereof; controlling the transportation of film through said film gate in response to said output signal; and
controlling the intensity of light
generated from said variable light source (20) based on the desired film transport speed, wherein said light sensing device (28r, 28g, 28b) is operated at full well potential during a conversion mode of operation and at partial well potential in a shuttle mode of operation.
7. A method as set forth in claim 6, further comprising converting signals generated by said light sensing device into a desired video signal.
8. A method as set forth in claim 7, further comprising recording said video signal when said light sensing device is operated in said conversion mode of operation.