JPH09304849A - Film reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make possible realizing further higher tone quality than conventional one. SOLUTION: Preceding a run of a movie, the sound data in a movie film sent to a digital signal reproducing device 11 are converted to an electric signal by a photodetector 12. The converted signal is stored in a hard disk device 15 from a film reproducing device 13 through a controller 14. The controller 14 sends a control signal to the film reproducing device 13, a motor drive circuit 17 and the hard disk device 15 based on the time code data related to the sound data together with the regenerative sound data from the film reproducing device 13 to control them. Further, a sound signal is sent from the controller 14 to a speaker 19. Since the sound data stored in the hard disk device 15 not the sound data from the movie film are read out successively at a real run time, the sound with the high tone quality is reproduced always independently of the number of run times without precise constitution.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a film reproducing apparatus. In detail, before playing the movie, the audio data is reproduced and stored in the recording means, and at the time of the actual screening, not the audio data from the film but the audio data stored in the recording means are sequentially read out. It is designed to be able to always play high-quality sound regardless of the number of times the movie film has been shown.

[0002]

2. Description of the Related Art Conventionally, commercial motion picture films having a width of 35 mm often have their audio information recorded as analog signals. In recent years, there has been an increasing demand for higher sound quality of such professional films, and in order to meet the demand, it has been performed to digitize and record audio information in addition to analog signals on movie films.

Recently, a more realistic movie is provided by the multi-channelization. As one of the means adopted to achieve such an object, a storage means (CD-ROM or the like) storing audio data separately from the movie film is prepared instead of recording the voice on the movie film. ,
There is a reproducing apparatus which distributes this together with a motion picture film and sequentially reproduces the storing means based on the time code recorded on the film to achieve high sound quality and multiple channels. However, with this method, movie film and CD-RO
It is necessary to manage two media of M.

On the other hand, there has appeared a device in which audio information is recorded as a digital signal in an area on the film which has not been used so far.

Referring to FIG. 5, an image is recorded in an image frame (frame) 2 which occupies a large area in the widthwise central portion of the motion picture film 1 as shown in FIG. Video frame 2 and right side perforation holes 3, 3
.. are formed with analog signal tracks 4 and 5 for the left and right audio signals L and R. Further, in FIG. 5, a first digital signal track (S-side digital signal track) is provided in a region between the right side perforation holes 3, 3 ... And the right side edge portion of the motion picture film 1.
6 are formed, and left perforation holes 7, 7 ...
A second digital signal track (P side digital signal track) 8 is formed in a region between the left side edge of the motion picture film 1 and the left side edge of the motion picture film 1. The digital signal includes, for example, a four-channel audio signal, and various control data such as a time code for the audio signal. In such a case, for example, one line (film width direction) can be configured as digital dot data for 64 dots.

In the example of FIG. 6, a first digital signal track (S-side digital signal track) 6'is formed in a region between the right-side perforation holes 3, 3 ... In the area between the holes 7, 7, ..., The second digital signal track (P
Side digital signal track) 8 '.

The audio data is reproduced by a digital signal reproducing device provided in the film reproducing device. This digital signal reproducing device is provided with a pair of reading optical systems for reading digital signals, and the light from the light source is condensed as signal pattern light by passing through the audio data recording area of the motion picture film. The condensed signal pattern light is imaged on the light receiving element, converted into an electric signal, and an audio signal synchronized with an image is reproduced.

[0008]

As described above, motion picture film has audio data recorded by analog signals or digital signals in addition to the video as described above. However, when reading digital signals, dots are accurately read. There must be. In addition, since a digital signal is recorded in a portion of the motion picture film that is not originally intended to record audio data, the reading means must be configured with high accuracy in order to read audio data without error. Therefore, when an error occurs by adding error correction parity to the audio data, compressing the audio data to reduce the amount of data, or changing the phase (time) of the data recorded on both sides, It also has a function to interpolate. However, by doing so, the redundancy with respect to the voice data increases, and the increase of the redundant data directly leads to the quality deterioration of the voice data and the limitation of the number of channels.

Further, when the film is screened many times, the sprocket teeth may damage the perforation holes 3 and 7, which may erode the area where the digital signal is recorded.

Further, in order to read the digital signal accurately, the signal pattern must be correctly formed on the image forming surface of the light receiving element each time the film is projected. Therefore, in order to minimize the position shift of the movie film, it is necessary to arrange various means for regulating the film reproducing apparatus, particularly the film running system, which causes a complicated structure and an increase in cost. Was there. In this way, the reproduction of audio data by digital signals in motion picture film is
Although it was intended to improve the quality of voice,
Various problems as described above occur.

Therefore, the present invention solves the above-mentioned problems and proposes a film reproducing apparatus in which the deterioration of the sound quality due to the reading error of the audio data recorded on the motion picture film is eliminated.

[0012]

In order to solve the above problems, the film reproducing apparatus according to the present invention reproduces a motion picture film in which audio information is recorded not only as an analog signal but also as a digitized digital signal. do it,
The digital signal is recorded in a recording means, and the digital signal recorded in the recording means is used as audio information when the motion picture film is shown.

According to the present invention, the audio data is reproduced before the movie is shown and stored in the recording means such as the hard disk. At the time of actual screening, not the audio data from the film but the audio data stored in the recording means are sequentially read and used. By doing so, it is possible to always reproduce high-quality sound regardless of the number of times the film is shown.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a film reproducing apparatus according to the present invention will be described in detail below with reference to the drawings.

According to the present invention, the recording processing is performed on the digital audio data recorded on the movie film before the movie film distributed to the movie theater is first shown.

FIG. 1 is an outline of a film reproducing apparatus including this recording means, and the film reproducing apparatus 13 reproduces audio data.

The motion picture film 1 is taken up from the supply reel 9 through the digital signal reproducing device 11 and to the take-up reel 10. Then, the sound data of the film is converted into an electric signal by the light receiving element 12 provided in the digital signal reproducing device 11. The converted signal is stored in the hard disk device 15 as a recording device from the film reproducing device 13 via the control device 14.
The digital information recording means may be another external storage device such as an MO (magneto-optical disk).

The control device 14 composed of a CPU is based on the reproduced audio data from the film reproducing device 13 and the time code data related to this audio data, and the film reproducing device 13, the motor drive circuit 17 and the hard disk device 15 are provided. To control these by sending control signals to. Further, an audio signal is sent from the control device 14 to the speaker 19. The control device 14 executes the control operation according to the instruction from the operation panel 16. Reference numeral 18 denotes a screen for displaying a movie film image.

FIG. 2 illustrates the digital signal reproducing apparatus 11. The motion picture film 1 supplied from the film supply reel 9 shown in FIG. 1 changes the feeding direction by the pulleys 20 and 20 shown in FIG. 2 to give the sprocket 21 a conveying force for the motion picture film 1 fed. Next, the motion picture film 1 is wrapped around the reproduced sound drum 22 in a substantially U shape. By the tension rollers 23, 23 provided between the reproduction sound drum 22 and the sprocket 21, the motion picture film 1 runs in a state of being in close contact with the reproduction sound drum 22. Playback Read the playback data by shining light on the movie film 1 wrapped around the sound drum 22 in a substantially U shape.
I do. The signal reading optical system 27 includes a light source 24, a light guide 25 that splits the light of the light source 24 into left and right, a condenser lens 26, and a light receiving element 12, and reads digital data and converts it into sound (electrical signal). To do. The motion picture film 1 thus read is taken up by the take-up reel 10 shown in FIG.

FIG. 3 shows a signal processing system in the film reproducing device 13 including the control device 14 and the hard disk device 15.

The light from the light source 24 is transmitted through the area 6, 6'or 8, 8'of the motion picture film 1 to be a signal pattern light and is focused on the light receiving element 12 such as a photodiode. In this example, the light receiving element 12 uses a line sensor having a sensor for at least 64 pixels. The electric signal converted by the light receiving element 12 is amplified by the amplifier 28, and then the waveform of the reproduction data is shaped by the waveform shaping processor 29. The shaped voice data and time code data in this example are recorded in the hard disk device 15 with the intervention of the CPU 14. All the audio data and the time code recorded on one motion picture film are recorded on the hard disk device 15, and the end of this recording ends the audio data storage process performed prior to the screening.

When the data storage process in the hard disk device 15 is completed, the film is on standby. The audio data stored in the hard disk device 15 is used as the audio data being displayed on the film, and the digital signal recorded on the film 1 is not used as the audio reproduction data.

In the actual reproduction of the audio data, only the time code data of the audio data recorded on the film 1 is reproduced and sent to the CPU 14.
The audio data with the same time code data as the reproduced time code data is hard disk device 1
5 is read out in synchronization with each other and is supplied to the D / A converter 31 via the switch 30 provided as necessary. By such a reading process, the video and the reproduced audio data from the hard disk device 15 can be synchronized. Voice data is converted to analog voice signal,
The sound is output from the plurality of speakers 19 provided in the hall via the amplifier 32. Here, in the present invention, since the brand-new film 1 is reproduced, only the audio data is stored in the hard disk device 15, and the stored audio data is output as audio information during the presentation in synchronization with the image. The error of audio data is hardly generated when stored in the hard disk device. for that reason,
It is not necessary to strictly consider parity addition and interpolation processing for error detection, and as a result, the redundancy of audio data can be reduced. This makes it possible to increase the number of recording channels.

The film feed speed during reproduction of audio data does not have to be the same as the film feed speed during normal reproduction. The film may be sent at high speed to shorten the transfer time. Conversely, the reliability of the read data may be improved. The film may be sent at a low speed so that a large amount of data can be read. Further, when there is an uncorrectable error when the audio data is stored in the hard disk device 15, if the film is rewound just before the error occurs and the audio data reproduction is repeated, further data storage is possible. Improves reliability.

The above-mentioned switch 30 is used when voice data recorded on the film 1 is also used. In this example, the voice data stored in the hard disk device 15 is used as interpolative data. Was done.

FIG. 4 is a flow chart showing an example of audio data processing for this purpose, which is the reproduction processing mode 3 shown in FIG.
When transitioning to 3, the data error is checked while reproducing the digital audio signal from the film 1 (steps 34 and 35). When a data error is found, the audio data read from the hard disk device 15 is used as a reproduction signal (step 3).
6). When no data error is found, the audio data reproduced from the film 1 is used as it is as the audio reproduction data. The above data error check is continued until the end of the film 1 (step 3).
7).

By the way, when the delivered film arrives late and there is not enough time until the screening time, the audio data may be simultaneously stored in the hard disk device 15 during the screening as a expedient. . In this case, in order to increase the reliability of the data to the hard disk device 15, the audio data read from the film is compared with the data on the hard disk device 15 in the second screening cycle, and the two are different and the read audio is read. If the data does not include an error, the data stored in the hard disk device 15 may be updated and replaced with the read audio data. As a result, the reliability of data storage in the hard disk device 15 is further improved by repeating this operation every time the film is screened several times.

[0028]

Since the film reproducing apparatus according to the present invention uses the audio data stored in the hard disk device, it is impossible to read the audio data from the motion picture film due to trouble occurrence or film deterioration during the actual screening. Even in such a case, high quality voice reproduction can be realized.

As described above, since the reliability at the time of screening is increased as compared with the conventional system, the redundancy such as parity and interpolation data added to the audio data can be greatly reduced, and as a result, , It is possible to increase the number of channels and the number of bits of audio data. This makes it possible to achieve higher sound quality.

Since the data storage processing is performed using a brand-new motion picture film immediately after distribution, it is not necessary to configure the film running system with high accuracy, and the cost can be reduced.

Furthermore, since an additional medium such as a CD-ROM is not used, a film reproducing apparatus using only one medium can be realized.

[Brief description of drawings]

FIG. 1 is a configuration diagram of essential parts showing an embodiment of a film reproducing apparatus according to the present invention.

FIG. 2 is a configuration diagram of a main part of a digital signal reproducing device.

FIG. 3 is a system diagram of essential parts showing an embodiment of a film reproducing apparatus according to the present invention.

FIG. 4 is a flowchart of a film reproducing apparatus during actual screening.

FIG. 5 is an enlarged view showing one frame of motion picture film in which digital signals are recorded on the edge of the motion picture film in addition to analog signals.

FIG. 6 is an enlarged view showing one frame of motion picture film in which digital signals are recorded between perforation holes of the motion picture film in addition to analog signals.

[Explanation of symbols]

1 ... Movie film, 3,7 ... Perforation hole, 4,5 ... Analog signal, 6,8,6 ', 8'
... Digital signal, 11 ... Digital signal reproducing device, 12 ... Light receiving element, 13 ... Film reproducing device, 14 ... Control device (CPU), 15 ... Hard disk device, 19 ... -Speaker, 21 ... sprocket, 24 ... light source, 29 ... waveform shaping processor

Claims (3)

[Claims] 1. A movie film in which audio information is recorded not only as an analog signal but also as a digitized digital signal is reproduced and the digital signal is recorded in a recording means. When the motion picture film is shown, the recording means is recorded. A film reproducing apparatus characterized in that the digital signal recorded in the above is used as audio information. 2. The film reproducing apparatus according to claim 1, wherein the reproducing speed of the motion picture film when recording data on the recording means is set to a normal speed or a speed different from the normal speed. 3. A film reproducing apparatus according to claim 1, wherein when an error occurs in said digital signal during data recording on said recording means, said motion picture film is rewound and re-recorded. apparatus.