Optics: motion pictures – With sound accompaniment – Common picture and sound record carrier systems
Patent
1995-05-22
1997-01-21
Mathews, A. A.
Optics: motion pictures
With sound accompaniment
Common picture and sound record carrier systems
352 14, 352 27, 352128, G03B 3102, G03B 2150
Patent
active
055963803
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a digital sound signal reproducing means for a projector provided in association with a digital projecting device constituting a digital sound projection system, and adapted for reproducing a digital sound signal by digital sound signal reading means from a digital sound signal recording section provided in correspondence with image frames of an image film fed out from an image film supply unit.
BACKGROUND ART
In the image film, there are provided continuous image frames and a sound signal recording section along with a large number of perforations bored at a fixed interval along the both side portions in a width direction for the purpose of precisely carrying out frame feed of these image frames. At this sound signal recording section, sound signals are recorded in correspondence with image frames.
In recent cinema systems, there is employed so called a digital sound projection system which has attained enhancement of presence (realism), etc. by stereo sound of more satisfactory sound quality by commonly using not only analog sound but also digital sound. In the image film for such digital sound projection system, a digital sound signal recording section is provided along with an analog sound signal recording section, and a sound signal recording section is constituted by the analog sound signal recording section and the digital sound signal recording section.
Namely, in an image film for digital sound system, respective two left and right perforations are bored in a manner spaced to each other in a feeding direction correspondingly, e.g., every continuous respective image frames. The analog sound signal recording section is provided between one perforations and the image frame, and analog sound signals are recorded therein. Moreover, a pair of left and right digital sound signal recording sections are respectively provided along the area between one perforations and one film side edge and between the other perforations and the other film side edge, and digital sound signals are respectively recorded therein. These digital sound signals are reproduced by a digital sound signal reproducing apparatus 200 which will be described later.
Meanwhile, since an image film for theater of two hours has extensive length which reaches about 18,000 feet or more, the image film was conventionally divided into plural films to respectively wind them on independent film reels. These film reels were alternately mounted on, e.g., two projectors so that screening is carried out. Accordingly, in such a conventional projector system, replacement work and or rewinding work to the projector of film reel, etc. were required. For this reason, many hands were required within a projection room.
In cinema theaters, hands are also short in recent years, and elimination or reduction of labor within the theater is being carried out because reduction of labor cost, etc. Also in the projector system, for the purpose of eliminating replacement work or rewinding work, etc. of a plurality film reels to realize reduction of the number of steps (man-hour) within the projection room, there has been introduced an image film automatic supply/winding unit in which image films are constituted so that they respectively become unitary continuous films every respective titles, and these image films are automatically delivered into a single projector thereafter to rewind them for a second time.
An image film fed out from the image film automatic/winding unit is caused to undergo reading or reproduction of digital sound signals recorded in the digital sound signal recording sections in digital sound signal reproducing apparatus (unit) 200. The digital sound signal reproducing unit 200 is combined with a digital projecting unit (projector), and includes, as shown in FIG. 1, includes a first guide roller 201, a guide sprocket 202, a sound drum 203 and a second guide roller 204 constituting a film traveling path of image film 1 delivered from the image film automatic supply/winding unit. Moreover, the digital so
REFERENCES:
patent: 4551827 (1985-11-01), Custer et al.
patent: 5155510 (1992-10-01), Beard
patent: 5327182 (1994-07-01), Kohut et al.
patent: 5386255 (1995-01-01), Beard et al.
Ozaki Yoshio
Saito Etsuro
Shirasu Toshiyuki
Frommer William S.
Mathews A. A.
Sinderbrand Alvin
Sony Cinema Products Corporation
Sony Corporation
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