JPH06242524A - Digital movie sound playback device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a digital movie sound reproducing device capable of stably reproducing an audio signal from two digital sound tracks by guiding a motion picture film by one guide drum. With the guide surface 10a of the guide drum 10 guiding the image recording area of the motion picture film 1, two light sources 11 are provided on two digital sound tracks provided along both sides of the image recording area along the film running direction. , 1
The reading light is emitted from 2 and the reading light is emitted from the two light receiving portions 1
By receiving light at 3 and 14, an audio signal is reproduced from each digital sound track of the movie film 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital movie sound reproducing apparatus for reproducing an audio signal from two digital sound tracks of a movie film.

[0002]

2. Description of the Related Art In a conventional motion picture film, as shown in FIG. 9, an analog sound track 202 is provided on one side of an image recording area 201 in which an image is recorded, along with a film running direction. Was recorded.

In order to reproduce a sound signal from the analog sound track 202 of the motion picture film 200, a guide having a guide surface 210a having a width approximately half the film width, as shown in FIGS. 10 and 11, is used. The drum 210 guides the side of the motion picture film 200 on which the analog soundtrack 202 is absent, so that the analog soundtrack 2 from the light source 220 is guided.
The light receiving unit 230 is irradiated with the reading light via 02, and the audio signal recorded in the analog sound track 202 is reproduced by the light receiving unit 230 as an electric signal having a signal level corresponding to the light amount of the reading light. Was there. The rotary shaft 210A of the guide drum 210 has a flywheel 2 for stabilizing the traveling speed of the film.
10B was provided.

[0004]

By the way, when projecting a motion picture film, it is required to reproduce sound with a high degree of realism. I have already applied for a technology that enables two-dimensional sound reproduction along the film running direction and digitally records digital audio signals on these digital sound tracks to enable realistic sound reproduction. (Japanese Patent Application No. 3-222342)
Japanese Patent Application No. 3-265001, Japanese Patent Application No. 4-32091
No. 8). This motion picture film is configured, for example, as shown in FIG.

In FIG. 12, reference numeral 1 denotes a motion picture film, which is an image recording area 2 in which an image to be projected is recorded, a perforation section 3 for conveying the motion picture film for projection, and a conventional device. However, an analog sound track 4 in which analog sound signals are recorded to enable sound reproduction, and digital sound tracks 5, 6 in which digital sound signals provided outside the perforations 3 are recorded are provided. I will do it.

In the case of reproducing an audio signal from two digital sound tracks 5 and 6 provided along the film running direction on both outer sides of the image recording area 2 in which the image of the motion picture film 1 is recorded as described above, for example, As shown in FIGS. 13 and 14, two guide drums 311 and 31 are provided.
2, by using the light sources 313, 314 and the light receiving sections 315, 316 to reproduce the audio signals independently from the digital sound tracks 5, 6 of the movie film 1, the mechanism of the audio signal reproduction system is There is a problem that it becomes larger. Further, in this case, since it is necessary to install the guide drums 311 and 312 in opposite directions to each other as shown in FIG. 14, it takes time and effort to mount the motion picture film 1 on these guide drums 311 and 312. There is a problem.

Further, for example, as shown in FIG. 15 and FIG. 16, the guide drums 321 and 322 are installed in the same direction, and at the intermediate position between the guide drums 321 and 322, the light sources 323 and 324 are connected to the motion picture film 1 as described above. Each light receiving section 32 through each digital sound track 5, 6 of
By irradiating 5,326 with the reading light, the work of mounting the motion picture film 1 on the respective guide drums 321 and 322 can be easily carried out. The reading error of the digital sound tracks 5 and 6 by the light receiving units 325 and 326 increases. Furthermore, in this case also, each of the two guide drums 3
25 and 326 are required, there is a problem that the mechanism of the audio signal reproducing system becomes large.

For example, as shown in FIG. 17, a single guide drum 330 guides the center portion of the motion picture film 1 so that the light sources 331 and 332 can be used to guide the digital sound tracks 5 of the motion picture film 1. The reading light is emitted to each of the light receiving portions 333 and 334 via the rotary shaft 330 of the guide drum 330.
Since A is an obstacle, it is impossible to irradiate one of the light receiving units 333 with the reading light.

In view of the above situation, the present invention provides an audio signal from two digital sound tracks provided along the film running direction on both outer sides of an image recording area where an image of a movie film is recorded. For the purpose of downsizing the digital movie sound reproducing device to be reproduced and stabilizing the reproducing operation, a movie film is guided by one guide drum and an audio signal is stably reproduced from two digital sound tracks. It is intended to provide a digital movie sound reproducing device capable of performing the same.

[0010]

In order to solve the above-mentioned problems, a digital movie sound reproducing apparatus according to the first invention has a film on both sides of an image recording area where an image of a movie film is recorded. What is claimed is: 1. A digital movie sound reproducing device for reproducing an audio signal from two digital sound tracks provided along a running direction, comprising: a guide drum having a guide surface that is in rolling contact with an image recording area of the motion picture film; A light source for irradiating each digital sound track of the motion picture film with reading light and a reading light for irradiating each digital sound track from the light source are received. A light receiving section and a reflecting mirror for guiding the read light to one of the light receiving sections are provided. It converted to is characterized in that for reproducing audio signals from the digital sound tracks of the motion picture film.

In the digital movie sound reproducing apparatus according to the second aspect of the invention, sound is output from two digital sound tracks provided along the film running direction on both outer sides of the image recording area where the image of the movie film is recorded. A digital movie sound reproducing device for reproducing a signal,
A guide drum having a guide surface that is in rolling contact with the image recording area of the motion picture film, a light source that emits reading light, and each digital sound of the motion picture film in which the image recording area is guided by the guide surface of the guide drum. The track is provided with an optical fiber for guiding and irradiating the reading light emitted from the light source, and two light receiving portions for receiving the reading light emitted to each of the digital sound tracks, and the reading light is provided by each of the light receiving portions. Is converted into an electric signal and an audio signal is reproduced from each digital sound track of the movie film.

Further, in the digital movie sound reproducing apparatus according to the third invention, the sound from two digital sound tracks provided along both sides of the film recording direction on both sides of the image recording area where the image of the movie film is recorded is reproduced. A digital movie sound reproducing device for reproducing a signal, wherein a guide drum having a guide surface divided into two parts which is in contact with the image recording area of the motion picture film, and the guide surface of the guide drum form an image recording area. A light source that emits reading light to each of the guided digital sound tracks of the motion picture film, and two light receiving portions that receive the reading light that is emitted from the light source to each digital sound track, are provided. Convert the read light into an electrical signal and convert the audio signal from each digital soundtrack of the movie film. It is characterized in that raw.

[0013]

In the digital movie sound reproducing apparatus according to the first invention, the digital movie sound reproducing apparatus is provided on both outer sides of the image recording area along the film running direction with the image recording area of the movie film being guided by the guide surface of the guide drum. By irradiating two digital sound tracks with reading light from a light source, and receiving the reading light with two light receiving sections,
An audio signal is reproduced from each digital soundtrack of the motion picture film. The reading light is guided to one of the light receiving portions via a reflecting mirror.

In the digital movie sound reproducing apparatus according to the second aspect of the invention, the image recording area of the motion picture film is guided by the guide surface of the guide drum, and both sides of the image recording area are extended along the film running direction. The reading light is emitted from the light source to the two provided digital sound tracks through the optical fiber, and the reading light is received by the two light receiving parts, so that the audio signal is output from each digital sound track of the movie film. Reproduce.

Further, in the digital movie sound reproducing apparatus according to the third aspect of the invention, while the image recording area of the motion picture film is guided by the guide surface of the guide drum divided into two parts, the film runs on both outer sides of the image recording area. The reading light is emitted from the light source to the two digital sound tracks provided along the direction, and the reading light is received by the two light receiving sections, thereby reproducing the audio signal from each digital sound track of the movie film. To do.

[0016]

Embodiments of the digital movie sound reproducing apparatus according to the present invention will be described below in detail with reference to the drawings.

The digital movie sound reproducing apparatus according to the present invention is constructed as shown in FIGS. 1 and 2, for example.

This digital movie sound reproducing apparatus is a digital movie sound reproducing apparatus for reproducing an audio signal from the two digital sound tracks 5 and 6 in the movie film 1 shown in FIG. The light sources 11 and 12, the light receiving units 13 and 14, and the reflecting mirrors 15 and 16 are provided.

The guide drum 10 has a guide surface 1
0a is transferred to the image recording area of the motion picture film 1 to guide the running of the motion picture film 1 in a state of not being in contact with the two digital sound tracks 5 and 6, and its rotation axis 10A is It is erected on the frame 19 while being rotatably supported by a bearing portion (not shown). Further, the rotary shaft 10A of the guide drum 10 has
A flywheel 10B is provided to stabilize the running speed of the motion picture film 1.

The light sources 11 and 12 emit reading light for optically reading the digital sound tracks 5 and 6 of the motion picture film 1 by the light receiving portions 13 and 14, for example, a halogen lamp or the like. Consists of
The reading light is emitted to the digital sound tracks 5 and 6 of the motion picture film 1 in which the image recording area 2 is guided by the guide surface 10a of the guide drum 10.

Each of the light receiving portions 13 and 14 is composed of, for example, a CCD sensor, and each of the light sources 1
The reading lights emitted from the digital sound tracks 5 and 6 from the light receiving devices 1 and 12 are received via the condenser lenses 17 and 18, respectively. Then, each of the light receiving units 13 and 14 outputs an electric signal having a signal level corresponding to the light amount of each of the reading light as each of the reading output signals of each of the digital sound tracks 5 and 6.

The reading light emitted from the light source 11 to one of the digital sound tracks 5 and 6 of the motion picture film 1 is blocked by the rotating shaft 19 of the guide drum 10 and the one light receiving portion 13 is provided. Cannot receive light directly, but as shown in FIG.
The light is reflected by 16 and guided to the one light receiving unit 13.

That is, the reflecting mirrors 15 and 16 reflect the reading light emitted from the light source 11 to one of the digital soundtracks 5 and 6 of the motion picture film 1 so that one of the light receiving portions 13 and 14 can be read. It is led to one light receiving unit 13.

As described above, in the digital movie sound reproducing apparatus of this embodiment, the optical path of the reading light which is obstructed by the rotating shaft 10A of the guide drum 10 is set to the reflecting mirror 1.
By detouring the rotary shaft 10A by 5, 16 it is possible to irradiate the light receiving section 13 with the reading light, and the respective digital sound tracks 5, 6 of the motion picture film 1 are provided.
Can be reliably read by the light receiving portions 13 and 14.

The digital movie sound reproducing apparatus according to the present invention is constructed as shown in FIGS. 3 and 4, for example.

This digital movie sound reproducing apparatus is a digital movie sound reproducing apparatus for reproducing an audio signal from the two digital sound tracks 5 and 6 in the movie film 1 shown in FIG. Light sources 21, 22 and optical fibers 23, 2
4, light receiving portions 25, 26 and the like.

The guide drum 30 has a guide surface 3
0a is transferred to the image recording area of the motion picture film 1,
The movement of the motion picture film 1 is guided in a state of not being in contact with the two digital sound tracks 5 and 6.

The guide drum 20 has a guide surface 2
0a is transferred to the image recording area of the motion picture film 1 to guide the running of the motion picture film 1 in a state of not being in contact with the two digital sound tracks 5 and 6, and its rotation axis 20A is The frame 29 is erected on the frame 29 while being rotatably supported by bearings (not shown). The guide drum 10 has a built-in flywheel made of a high specific gravity material such as lead for stabilizing the running speed of the motion picture film 1.

The light sources 21 and 22 emit reading light for optically reading the digital sound tracks 5 and 6 of the motion picture film 1 by the light receiving portions 25 and 26, for example, a halogen lamp. And so on.

The optical fibers 23 and 24 are connected to the digital sound tracks 5 and 6 of the motion picture film 1 in which the image recording area 2 is guided by the guide surface 20a of the guide drum 20 and the light sources 21 and 24. Each reading light emitted from 22 is guided and irradiated.

Since the reading light emitted from the light source 21 is blocked by the rotating shaft 20A of the guide drum 20, it cannot be directly applied to one of the digital sound tracks 5 and 6 of the motion picture film 1. But,
As shown in FIG. 3, the optical fiber 23 is guided to the one digital sound track 5, 6 while avoiding the rotary shaft 20A.

Further, each of the light receiving portions 25 and 26 is composed of, for example, a CCD sensor, and each of the light sources 2
The read light emitted from the digital sound tracks 5 and 6 from the light sources 1 and 22 is received via the condenser lenses 27 and 28. Then, the light receiving units 25 and 26 output electric signals having signal levels corresponding to the light amounts of the reading lights as the reading output signals of the digital sound tracks 5 and 6, respectively.

As described above, in the digital movie sound reproducing apparatus of this embodiment, the optical path of the reading light which is obstructed by the rotating shaft 20A of the guide drum 20 is detoured around the rotating shaft 19 by the optical fiber 23. The reading light from the light source 21 can be guided to the one digital sound track 5 and irradiated, and the digital sound tracks 5 and 6 of the motion picture film 1 can be reliably read by the light receiving portions 25 and 26. .

Further, the digital movie sound reproducing apparatus according to the present invention is constructed as shown in FIGS. 5 and 5, for example.

This digital movie sound reproducing apparatus is a digital movie sound reproducing apparatus for reproducing an audio signal from the two digital sound tracks 5 and 6 in the movie film 1 shown in FIG. Drum 30, light sources 31, 32, optical fiber 3
3, 34, light receiving portions 35, 36 and the like.

The guide drum 30 has drum halves 30A and 30B having guide surfaces 30a and 30b, respectively.
Are connected by a rotary shaft 30C, and the guide surfaces 20a, 20b of the drum halves 20A, 20B are brought into contact with the image recording area of the motion picture film 1 so as not to be connected to the two digital sound tracks 5, 6. The motion of the motion picture film 1 is guided in the contact state.

The guide drum 30 is rotatably supported by a bearing portion 39A provided at the tip of a column 39 having a rotary shaft 30C connecting the drum halves 30A and 30B and fixed to a frame (not shown). There is. In addition, flywheels 30E and 30F formed of a high specific gravity material such as lead are provided on the drum halves 30A and 30B in order to obtain a flywheel effect for stabilizing the traveling speed of the movie film 1. It is built in.

The light sources 31 and 32 emit reading light for optically reading the digital sound tracks 5 and 6 of the motion picture film 1 by the light receiving portions 35 and 36, for example, a halogen lamp. And so on.

The optical fibers 33 and 34 have the motion picture film 1 in which the image recording area 2 is guided by the guide surfaces 30a and 30b of the guide roller 30.
Each of the above light sources 3 on each of the digital soundtracks 5 and 6
Each reading light emitted from 1, 32 is guided and irradiated.

Further, each of the light receiving portions 35 and 36 is composed of, for example, a CCD run sensor, and each of the light sources 2
The reading lights emitted from the digital sound tracks 5 and 6 from the light sources 1A and 21B are received through the condenser lenses 37 and 38, respectively. Then, the light receiving units 37 and 38 output electric signals having signal levels corresponding to the light amounts of the reading lights as reading output signals of the digital sound tracks 5 and 6, respectively.

As described above, in the digital movie sound reproducing apparatus of this embodiment, the guide drum 30 has the drum half 30 having the guide surfaces 30a and 30b.
Since A and 30B are connected by the rotating shaft 30C, the rotating shaft 30C does not interfere with the reading light emitted from the light sources 31 and 32 to the digital sound tracks 5 and 6 of the motion picture film 1, respectively. Each of the light sources 31, 32
Therefore, it is possible to directly irradiate the respective reading lights onto the respective digital sound tracks 5 and 6. Therefore, the digital sound tracks 5 and 6 of the motion picture film 1 can be reliably read by the light receiving portions 37 and 38.

The digital movie sound reproducing apparatus according to the present invention having the above-described structure is installed in the projection apparatus as a digital audio reproducing section 110 as shown in FIG. 7, for example.

In the projection apparatus 100 shown in FIG. 7, the motion picture film 1 is sent out from the supply reel 101, and the guide rollers 111, 121, 131 and the sprocket 11 are used.
2, 122, 132, guided by guide drums 113, 133, etc., and taken up by the take-up reel 102 via the digital audio reproduction section 110, the projection section 120, and the analog audio reproduction section 130.

The digital audio reproducing section 110 is
Each digital soundtrack of the movie film 1,
6, which reproduces an audio signal by reading the digital pattern of No. 6 and which is driven by the guide roller 111, the sprocket 112, and the guide drum 113. The reading light is emitted from the above to the digital sound tracks 5 and 6, and the reading light is received by the CCD line sensors 51 and 52, whereby the digital pattern of the digital sound tracks 5 and 6 is read and an audio signal is generated. Reproduce.

This digital audio reproducing section 110 is
The detection unit 40 that detects the passage of the teeth of the sprocket 112 that meshes with the perforation unit 2 of the motion picture film 1 obtains a detection signal of a frequency (96 Hz) proportional to the running speed of the motion picture film 1, The detection signal is supplied to the reproduction clock generation unit 50 of the reproduction processing system shown in FIG.

The reproduction clock generation unit 50 is synchronized with a 96 Hz detection signal obtained by detecting the passage of the teeth of the sprocket 112 meshing with the perforation unit 2 of the motion picture film 1 by the detection unit 40.
A reproduction clock of 4.1 kHz is generated by the PLL.

Then, this digital audio reproducing section 1
In FIG. 10, the reproduction clock generation unit 5 is provided for each dot pattern data obtained by reading the digital pattern of each digital sound track 5, 6 of the movie film 1 with each CCD line sensor 41A, 41B.
The demodulation circuit units 52A and 52B operating according to the reproduction clock supplied from 0 demodulate the compressed audio data of each channel, and the error correction circuits 53A and 53B.
At, the audio data is subjected to error correction processing, and the compressed audio data of each channel is reproduced on the memory 54. Then, the data expansion processing circuit 5 that operates according to the reproduction clock supplied from the reproduction clock generation unit 50.
By performing data expansion processing in 5, audio data of each channel is reproduced.

The projection unit 1 in this projection apparatus
Reference numeral 20 is a screen for projecting an image of the motion picture film 1 onto a screen (not shown). The projection light from the projection light source 123 is projected onto the image recording area 3 of the motion picture film 1 guided by the guide roller 121 and the sprocket 122. The projection light is emitted and emitted from the projection lens 124.

The analog audio reproducing section 13 is also provided.
0 is for reproducing an analog audio signal from the analog sound track 4 of the motion picture film 1, and is transmitted to the guide drum 133 of the motion picture film 1 guided by the guide roller 131, the sprocket 132 and the guide drum 133. In the winding part, the reading light is emitted from the light source 134 to the analog sound track 4,
By receiving the read light by the optical sensor 135, an analog audio signal is reproduced from the analog sound track 4.

[0050]

As described above, in the digital movie sound reproducing apparatus according to the present invention, in the state where the image recording area of the motion picture film is guided by the guide surface of the guide drum,
Two digital sound tracks provided on both outer sides of the image recording area along the film running direction are irradiated with reading light from a light source, and each digital sound track of the motion picture film is read by each of the light receiving sections to output an audio signal. Can be played.

That is, in the digital movie sound reproducing apparatus according to the first aspect of the present invention, the optical path of the reading light that is obstructed by the rotating shaft of the guide drum is detoured around the rotating shaft by the reflecting mirror, so that the reading light is transmitted to each light receiving portion. It is possible to guide and irradiate, and each digital sound track of the motion picture film can be reliably read by each of the light receiving sections.

Further, in the digital movie sound reproducing apparatus according to the second aspect of the present invention, the optical path of the reading light which is obstructed by the rotating shaft of the guide drum is detoured around the rotating shaft by the optical fiber, so that the reading light from the light source is separated from each other. It is possible to guide and irradiate the digital soundtrack, and each light-receiving section can reliably read each digital soundtrack of the movie film.

Furthermore, in the digital movie sound reproducing apparatus according to the third aspect of the invention, the image recording area of the movie film is guided by the guide surface of the guide drum divided into two parts. The reading light can be directly emitted from the light source to the two digital sound tracks provided along the line, and each digital sound track of the motion picture film can be surely read by each light receiving unit that receives the reading light. .

Therefore, according to the present invention, it is possible to provide a digital movie sound reproducing apparatus capable of stably reproducing an audio signal from two digital sound tracks by guiding a motion picture film with one guide drum. And a miniaturization and reproducing operation of a digital movie sound reproducing apparatus for reproducing an audio signal from two digital sound tracks provided along the film running direction on both sides of an image recording area where an image of a movie film is recorded. Can be stabilized.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a main part configuration of a first embodiment of a digital movie sound reproducing device according to the present invention.

FIG. 2 is a schematic plan view showing a main configuration of the first embodiment.

FIG. 3 is a schematic side view showing a main configuration of a second embodiment of the digital movie sound reproducing device according to the present invention.

FIG. 4 is a schematic plan view showing the configuration of the main part of the second embodiment.

FIG. 5 is a schematic side view showing a main configuration of a third embodiment of the digital movie sound reproducing device according to the present invention.

FIG. 6 is a schematic plan view showing a configuration of a main part of the third embodiment.

FIG. 7 is a diagram showing a schematic configuration of a projection device equipped with a digital movie sound reproduction device according to the present invention.

FIG. 8 is a block diagram showing a configuration of a reproduction processing system of a digital audio reproducing unit in the projection device.

FIG. 9 is a diagram schematically showing a format of a conventional motion picture film.

FIG. 10 is a schematic side view showing a main configuration of a conventional analog soundtrack reading device for movie films.

FIG. 11 is a schematic plan view showing a main configuration of the conventional reading device.

FIG. 12 is a diagram schematically showing the format of a motion picture film provided with two digital sound tracks.

FIG. 13 is a schematic side view showing a configuration example of a main part of a reading device for reading two digital sound tracks of the movie film.

FIG. 14 is a schematic plan view showing the main configuration of the reading device shown in FIG.

FIG. 15 is a schematic side view showing a configuration example of a main part of another reading device of the two digital sound tracks of the movie film.

16 is a schematic plan view showing the main configuration of the reading device shown in FIG.

FIG. 17 is a schematic side view showing a configuration example of a main part of still another reading device for the two digital sound tracks of the movie film.

[Explanation of symbols]

1 ・ ・ ・ Movie film 5,6 ・ ・ ・ Digital soundtrack 11,12,21 , 22, 31, 32 ... Light source 13, 14, 25, 26, 35, 36 ... Light receiving portion 10, 20, 30 ..... Guide drum 10a, 30a, 30a , 30b ... Guide surfaces 10A, 20A, 30C ... Rotating shafts 15, 16 ... Reflecting mirrors 23, 24 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Optical fiber

Claims (3)

[Claims] 1. A digital movie sound reproducing apparatus for reproducing an audio signal from two digital sound tracks provided along the film running direction on both outer sides of an image recording area in which an image of a movie film is recorded. A guide drum having a guide surface that is in rolling contact with the image recording area of the motion picture film, and a light source for irradiating reading light to each digital sound track of the motion picture film whose image recording area is guided by the guide surface of the guide drum. And two light receiving portions for receiving the reading light emitted from the light source to each digital sound track, and a reflecting mirror for guiding the reading light to one of the light receiving portions. Each of the light receiving portions outputs the reading light. Digitizer characterized by converting to an electric signal and reproducing an audio signal from each digital sound track of the above-mentioned motion picture film Movie sound playback device. 2. A digital movie sound reproducing device for reproducing an audio signal from two digital sound tracks provided along the film running direction on both outer sides of an image recording area in which an image of a movie film is recorded. A guide drum having a guide surface that is in rolling contact with the image recording area of the motion picture film, a light source that emits reading light, and each digital sound of the motion picture film whose image recording area is guided by the guide surface of the guide drum. The track is provided with an optical fiber for guiding and irradiating the reading light emitted from the light source, and two light receiving portions for receiving the reading light emitted to each of the digital sound tracks, and the reading light is provided by each of the light receiving portions. Is converted into an electric signal and an audio signal is reproduced from each digital sound track of the movie film. That digital movie sound reproducing apparatus. 3. A digital movie sound reproducing device for reproducing an audio signal from two digital sound tracks provided along both sides of the image recording area where an image of a motion picture film is recorded, the two digital sound tracks being provided. A guide drum having a two-divided guide surface that is in contact with the image recording area of the motion picture film, and a digital sound track of the motion picture film in which the image recording area is guided by each guide surface of the guide drum. The movie film is provided with a light source that emits light and two light receiving portions that receive the reading light emitted from the light source to each digital sound track, and convert the reading light into an electric signal by each of the light receiving portions. A digital movie sound reproducing device characterized by reproducing an audio signal from each digital sound track of