JPH07281324A - Audio data reproducing device for motion picture film - Google Patents

Abstract

PURPOSE:To output only accurate audio data regardless of the mounting accuracy and the tracking state of each CCD line sensor. CONSTITUTION:The 1st to 3rd CCD line sensors 2 to 4 are provided so that the read areas of the CCD line sensors 2 to 4 may be respectively positioned in the width of the recording track of the audio data recorded in the digital sound track of a motion picture film 1; and 1st to 3rd tracking detection circuits 5 to 7 detect the tracking state based on the audio data read by the CCD line sensors 2 to 4. Then, a switching control circuit 8 controls to switch a changeover switch 9 by which the audio data from the CCD line sensors 2 to 4 is supplied based on detection output from the detection circuits 5 to 7 so that only the audio data reproduced in the accurate tracking state may be outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio data reproducing apparatus for a movie film, which reproduces the audio data from a movie film in which audio information is digitally recorded as audio data. The present invention relates to an audio data reproducing device for a movie film capable of accurately reproducing audio data.

[0002]

2. Description of the Related Art In a conventional motion picture film, a video recording area is arranged in a frame shape at a substantially central portion of the film, and film winding holes for film winding are provided on both sides of the video recording area. Perforation) is provided.
Further, an analog sound track is linearly provided along the winding direction of the film between the video recording area and either one of the perforations, and an analog audio track is recorded on the analog sound track. It was like this.

However, with the development of digital technology in recent years, there has been a movement to digitally record the above audio information. The recording positions of the video recording area and the analog sound track are SMPT (Sciety Motion) which is an association of movie and television engineers in the United States.
Since it is standardized by Picture and Television Engneers, it is necessary to record the digitized audio information (audio data) at a position other than the recording position such as the video recording area or the analog sound track.

For this reason, conventionally, for example, a digital sound track for the right channel and a digital sound track for the left channel are provided between each of the above-mentioned perforations and each edge of the motion picture film. Audio data for the left channel and audio data for the left channel are recorded along the moving direction of the motion picture film.

Specifically, in each of the digital sound tracks, synchronization data, right channel audio data or left channel audio data recorded at predetermined intervals in a direction orthogonal to the moving direction of the motion picture film, and Tracking patterns recorded on both sides of the audio data recording track are recorded.

The synchronous data is recorded at the head of a block of a predetermined number of data, and subsequently, the audio data is recorded in block units. The tracking pattern is recorded at the recording start portion and the recording end portion of the recording track of the audio data, respectively, and when viewed as a whole, a movie film progresses on both sides of each digital sound track. It is designed to be recorded in strips along the direction.

A conventional motion picture film audio data reproducing apparatus for reproducing the above audio data from such a motion picture film has a reading area for one recording track recorded in a direction orthogonal to the moving direction of the motion picture film. It is composed of one CCD line sensor and a light source for irradiating light to each CCD line sensor through each digital sound track of the movie film.

In such an audio data reproducing apparatus for a movie film, at the time of reproduction, the light emitting source is driven to light. As a result, the light from the light emission source comes to have information such as the audio data via the digital sound tracks, and is irradiated to the CCD line sensors as photo-audio data.

Each CCD line sensor receives the opticalized audio data and performs photoelectric conversion to reproduce the electrical synchronization data, audio data, tracking pattern, etc., and process the data. Supply to the department.

The data processing unit reproduces audio data for each block in synchronization with the synchronous data and supplies the audio data to the D / A converter. The D / A converter analogizes the audio data to form an audio signal, and supplies the audio signal to the speaker device. As a result, a voice output corresponding to the audio data can be obtained via the speaker device.

Further, the data processing unit is provided for each of the CCDs.
Tracking control is performed by detecting the tracking pattern from the line sensor.

That is, as described above, the tracking pattern is recorded on both sides (recording start position and recording end position) of one recording track of audio data. Therefore, the data processing unit detects a tracking error by detecting, for example, a level difference between the tracking pattern reproduced at the recording start position and the tracking pattern reproduced at the recording end position. Then, in accordance with this tracking error, each C
The read timing of the CD line sensor is variably controlled, or the inclination of the mounting position of each CCD line sensor is variably controlled.

Thus, the tracking error can be corrected and the audio data can always be reproduced in the just track state.

[0014]

However, in the conventional audio data reproducing apparatus for movie films, the correction of the tracking error is variably controlled by the readout timing of the CCD line sensor, which is an electric control. Can quickly deal with tracking errors, but on the other hand, only subtle corrections can be made,
We could not cope with a large tracking error.

Further, it is necessary to attach the CCD line sensor with high precision, and there is a problem that assembly becomes difficult.

Further, when performing mechanical control such as variably controlling the inclination of the mounting position of the CCD line sensor, the tracking error cannot be quickly dealt with because of the mechanical control, and the CCD line sensor is not able to be dealt with quickly. However, there is a problem that the device is complicated and large in size.

The present invention has been made in view of the above-mentioned problems, and it is possible to reduce the mounting accuracy of the CCD line sensor, and it is possible to immediately use electrical control without increasing the size and complexity of the device. It is an object of the present invention to provide a movie film audio data reproducing apparatus which can cope with a large tracking error as well as a tracking error.

[0018]

An audio data reproducing apparatus for motion picture film according to the present invention comprises a plurality of line sensors for reading audio data recorded in a digital sound track of a motion picture film, and a plurality of line sensors for reading the audio data. Switching means for switching and outputting each of the read audio data, and detecting the audio data read in an accurate tracking state among the audio data read by the plurality of line sensors, and outputting the audio data. Thus, there is a switching control means for controlling the switching of the switching means.

Further, in the audio data reproducing apparatus for a motion picture film according to the present invention, as the motion picture film, audio data is recorded on the digital sound track in a direction orthogonal to the traveling direction of the motion picture film, and the audio data is recorded. In addition to having a recording pattern recorded on both sides of a data recording track, the plurality of line sensors function as recording tracks for the audio data in which the reading areas are each in a direction orthogonal to the moving direction of the motion picture film. Some are provided so as to be located within the width.

Further, in the audio data reproducing apparatus for a motion picture film according to the present invention, as the motion picture film, audio data is recorded on the digital sound track in a direction orthogonal to the moving direction of the motion picture film, and the audio data is recorded. A tracking pattern is recorded at a predetermined data recording track interval in a direction orthogonal to the moving direction of the motion picture film. Some of them are provided so as to be positioned within the recording width of the tracking pattern in the direction orthogonal to.

[0021]

The audio data reproducing apparatus for a motion picture film according to the present invention reads the audio data recorded in the digital sound track of the motion picture film by a plurality of line sensors.

Specifically, audio data is recorded on the digital sound track recorded on the motion picture film in a direction orthogonal to the moving direction of the motion picture film, and both sides of the audio data recording track are recorded. The tracking pattern is recorded on. On the other hand, the plurality of line sensors are provided so that each reading area is located within the recording track width of the audio data in the direction orthogonal to the moving direction of the motion picture film.

Alternatively, audio data is recorded on the digital sound track recorded on the movie film in a direction orthogonal to the moving direction of the movie film, and the movie is recorded at a predetermined recording track interval of the audio data. The tracking pattern is recorded in the direction orthogonal to the film traveling direction. On the other hand, the plurality of line sensors are provided so that each reading area is located within the recording width of the tracking pattern in the direction orthogonal to the moving direction of the motion picture film.

Each of the line sensors reads the tracking pattern and the audio data and supplies them to the switching means and the switching control means, respectively.

The switching control means detects the audio data read in the accurate tracking state among the audio data read by the plurality of line sensors, and outputs the audio data.
The switching means controls switching.

As a result, even if the motion picture film is tilted, the switching control means can control the switching means so that only the audio data read in the accurate tracking state is output. Therefore, only the correctly read audio data can be output regardless of the tracking state.

Further, since accurate audio data can be output regardless of the mounting position of the line sensor, a large tracking error can be dealt with and the mounting accuracy of each line sensor can be relaxed. Further, since it is electrically controlled, it is possible to immediately deal with the tracking error. Further, because of the above electrical control, it is not necessary to provide a complicated mechanism or the like for moving the line sensor, and the size of the device can be reduced by simplifying the configuration.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of an audio data reproducing apparatus for motion picture film according to the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, the motion picture film audio data reproducing apparatus according to the present embodiment is a motion picture film 1 as shown in FIG.
First to third CCD line sensors 2 to 4 for reading audio data digitally recorded in the first and first for detecting tracking states from the audio data read by the CCD line sensors 2 to 4, respectively. To third tracking detection circuits 5 to 7.

Further, in the audio data reproducing apparatus for motion picture film according to the above embodiment, the changeover switch 9 for switching and outputting the audio data of the CCD line sensors 2 to 4 and the tracking detection circuits 5 to 7 are detected. The switching control circuit 8 controls switching of the switching switch 9 so that audio data read in an accurate tracking state is output according to the tracking state.

Further, the audio data reproducing apparatus for a motion picture film according to the above-described embodiment, based on the error correction code added to the audio data from the changeover switch 9, generates an error by performing error correction processing on the audio data. A circuit 10, a decoder 11 for decoding the encoded and recorded audio data, a D / A converter 12 for converting the audio data into an analog audio signal, and a predetermined gain for the audio signal. And an amplifier circuit 13 that amplifies and outputs.

On the motion picture film 1, as shown in FIG. 2, a frame-shaped image recording area 22 is formed substantially at the center of the film.
Are provided, and a right perforation 20R and a left perforation 20L are provided so as to sandwich the video recording area 22. Further, between the right perforation 20R and the video recording area 22,
An analog sound track 21R for the right channel and an analog sound track 21L for the left channel are provided along the traveling direction of the film, and an audio signal is recorded on each analog sound track in an analog manner. There is.

Further, the above right perforation 20R
And a right edge 1R of the motion picture film 1, a digital sound track 23R for the right channel is provided along the traveling direction of the film, and a film is formed between the left perforation 20L and the left edge 1L of the motion picture film 1. The left-channel digital sound tracks 23L are provided along the traveling direction of, and the digital sound tracks 23R and 23L are adapted to digitally record audio data.

Each of the digital sound tracks 23R,
The audio data for each channel recorded in 23L is recorded in 1 block units as shown in FIG. This one block is formed of, for example, 200 tracks (25 bytes) along the film traveling direction and 64 dots in a direction orthogonal to the film traveling direction, and the tracking patterns 31a, 3 are formed on both sides thereof.
1b is recorded. Further, a black belt-shaped discrimination line 32 for discriminating the digital sound track is recorded on the edge side of the block, and the synchronization data 30 is recorded at the head of the block.

The sync data 30 is a black-and-white repeating pattern of 3 dots in the vertical direction (the moving direction of the film) and 3 dots in the horizontal direction (the direction orthogonal to the moving direction of the film).

Further, the tracking patterns 31a,
Reference numeral 31b is a black-and-white repeating pattern of 1 dot in the vertical direction and 2 dots in the horizontal direction, and is recorded along the moving direction of the film, and the black patterns are staggered (staggered).

The audio data is recorded below the synchronous data 30. The audio data is recorded in FIG.
As shown in (a), each tracking pattern 31a,
It is recorded such that the opposite surface of the black pattern 31b is located at the center of the audio data. Therefore, in FIG.
In the case of the just track as shown by the solid line in (a), the reproduction output of the tracking patterns 31a and 31b is
As indicated by the solid line in FIG. 6B, the level is intermediate between the reproduction level of the black pattern and the reproduction level of the white pattern indicated by the dotted line.

To the error correction, so-called C1 parity and C2 parity are added to the audio data and cross-interleave processing is performed.

Next, the operation of the audio data reproducing apparatus for motion picture film according to this embodiment will be described. First, at the time of reproduction, the halogen lamps provided on the back side of the digital sound tracks 23R and 23L of the movie film 1 are driven to light. As a result, the light from the halogen lamp is transmitted to each digital soundtrack 23.
The tracking pattern 31a,
31b, synchronization data 30, audio data, and other information, and the CCD line sensors 2 to 4 are irradiated as opticalized audio data.

The CCD line sensors 2 to 4 receive the converted audio data and perform photoelectric conversion to generate the electrical synchronization data 30, the audio data, the tracking patterns 31a and 31b, and the like. Playback is performed, and these are supplied to the first to third tracking detection circuits 5 to 7, respectively, and the changeover switch 9
To the selected terminals 9a to 9c.

As shown by the dotted line (reproduction level of the tracking pattern at the time of off-track) and the solid line (reproduction level of the tracking pattern at the time of just track) in FIG. 4B, the off-track and the just-track are shown. The reproduction levels of the tracking patterns 31a and 31b are different. Therefore, the tracking detection circuits 5 to 7 detect the tracking states based on the reproduction levels of the tracking patterns 31a and 31b supplied from the CCD line sensors 2 to 4, and switch the detection output. It is supplied to the control circuit 8.

The switching control circuit 8 detects the CCD line sensor which has reproduced the audio data on the just track based on the detection output from each of the tracking detection circuits 5 to 7, and is read by the CCD line sensor. Selected terminal 9 supplied with audio data
The changeover switch 9 is controlled to be switched so that a to 9c are selected by the selection terminal 9d.

Specifically, as shown in FIG. 5, when the motion picture film 1 is slanted and the CCD line sensors 2 to 4 and the recording track for audio data and the like obliquely face each other, the CCD line is moved. The sensors 2 to 4 respectively read the audio data and the like in the direction orthogonal to the moving direction of the motion picture film as usual, and supply them to the changeover switch 9 and the tracking detection circuits 5 to 7.

The switching control circuit 8 is a CCD which reproduces the audio data on the just track based on the detection output from each of the tracking detection circuits 5 to 7.
The line sensors 2 to 4 are detected. In this case, in the switching control circuit 8, the first half of the audio data is reproduced on the just track by the first CCD line sensor 2 and the middle part is just by the second CCD line sensor 3 as shown by the hatched lines in FIG. It is detected based on the detection output from each of the tracking detection circuits 5 to 7 that the reproduction is performed on the track and the latter half is reproduced on the just track by the third CCD line sensor 4. The first half selects audio data from the first CCD line sensor 2, the middle part selects audio data from the second CCD line sensor 3, and the second half selects from the third CCD line sensor 4. The changeover switch 9 is controlled so as to select the audio data.

As a result, each CCD line sensor 2-4
It is possible to output only the correctly read audio data regardless of the attachment position of the, and regardless of the tracking state.

Therefore, a large tracking error can be dealt with, and the mounting accuracy of each line sensor can be relaxed. Also, for electrical control,
Tracking errors can be dealt with immediately. Further, because of the above electrical control, it is not necessary to provide a complicated mechanism or the like for moving the line sensor, and the size of the device can be reduced by simplifying the configuration.

The audio data reproduced in this way is sent to the error correction circuit 10 via the changeover switch 9.
Is supplied to. Since C1 parity and C2 parity are added to the audio data as described above, the error correction circuit 10 performs error correction processing based on each of the parities and supplies the audio data to the decoder 11. . The decoder 11 performs decoding processing on the audio data that has been encoded and recorded, and supplies this to the D / A converter 12. The D / A converter 12 converts the digital audio data into an analog audio signal, and amplifies the analog audio signal.
Supply to. The amplifier circuit 13 amplifies the audio signal with a predetermined gain and outputs it through the output terminal 14.

The audio signal output through the output terminal 14 is supplied to, for example, a speaker device (not shown). As a result, it is possible to obtain an audio output corresponding to the audio data recorded on the motion picture film 1 through the speaker device.

Next, in the description of the above-mentioned embodiment, the movie film 1 in which the tracking patterns 31a and 31b are recorded on both sides of the recording track of the audio data is used. This is shown in FIG. A motion picture film as shown may be used.

That is, in this motion picture film, as shown in FIG. 6, black strip-shaped discrimination lines 51a and 51b for discriminating the digital sound tracks are recorded on both sides of the digital sound tracks 23R and 23L, respectively. The head data 50 is recorded at the head of one block of audio data. Also, audio data 5
One side of the second recording track (for example, the edge side of the film)
The first tracking patterns 53a and 53b are recorded on.

As the head data 50, as shown in FIG. 7, sync data (preamble) 55 which is a black and white repeating pattern of vertical 3 dots and horizontal 3 dots, and black and white repeating pattern of vertical 2 dots, horizontal 2 dots The second tracking pattern 56 in which two lines are recorded in a zigzag pattern and a block I indicating the identification number of the block.
D57 is recorded.

When such a motion picture film is used, the CCD line sensors 2 to 4 are provided so as to be located within the recording width of the second tracking pattern 56, and the first and second tracking patterns are provided. 53a, 5
3b, 56, audio data and the like are reproduced, and the reproduction output is supplied to each of the tracking detection circuits 5-7.

Each of the tracking detection circuits 5 to 7 is based on the reproduction output of each of the first and second tracking patterns 53a, 53b and 56 from each of the CCD line sensors 2 to 4 and each of the CCD line sensors 2. Each of the tracking states 4 to 4 is detected, and the detection outputs are supplied to the switching control circuit 8.

The switching control circuit 8 selects and outputs only the audio data read in the accurate tracking state as described above on the basis of the detection outputs from the tracking detection circuits 5 to 7. The changeover switch 9 is controlled to change over.

As a result, the same effects as described above can be obtained such that only accurate audio data can be output regardless of the tracking state.

In the above description of the embodiments, three CCD line sensors 2 to 4 are provided as CCD line sensors, but this is a technical idea according to the present invention depending on the recording track width and the like. Of course, it is possible to change as appropriate within the range not deviating from.

[0057]

According to the audio data reproducing apparatus for motion picture film of the present invention, the audio data of one recording track is read by a plurality of line sensors, and only the audio data read in the accurate tracking state according to the tracking state is read. Since the output is selected and output, only the correctly read audio data can be output regardless of the attachment position of the line sensor and the tracking state.

Therefore, a large tracking error can be dealt with, and the mounting accuracy of each line sensor can be relaxed. Also, for electrical control,
Tracking errors can be dealt with immediately. Further, because of the above electrical control, it is not necessary to provide a complicated mechanism or the like for moving the line sensor, and the size of the device can be reduced by simplifying the configuration.

[Brief description of drawings]

FIG. 1 is a block diagram of an audio data reproducing apparatus for motion picture film according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a movie film in which audio data is reproduced by the audio data reproducing device for a movie film according to the embodiment.

FIG. 3 is a diagram showing tracking patterns recorded on both sides of a digital sound track of the movie film.

FIG. 4 is a diagram for explaining tracking control based on the reproduction output of the tracking pattern.

FIG. 5 is a diagram for explaining a switching control operation of a switching control circuit provided in the audio data reproducing apparatus for a movie film according to the above-described embodiment.

FIG. 6 is a diagram showing head data recorded at the head of audio data of each block recorded in the digital sound track.

FIG. 7 is a diagram showing recorded contents of the top data.

[Explanation of symbols]

 1 Movie Film 1L Right Edge of Movie Film 1R Left Edge of Movie Film 2-4 First to Third CCD Line Sensors 5-7 First to Third Tracking Detection Circuits 8 Switching Control Circuit 9 Switching Switches 9a-9c Switching Selected terminal of switch 9d Selection terminal of switch 10 Error correction circuit 11 Decoder 12 D / A converter 13 Amplification circuit 14 Output terminal 20R Right perforation 20L Left perforation 21R Right channel analog sound track 21L Left channel analog sound Track 22 Video recording area 23R Digital sound track for right channel 23L Digital sound track for left channel 30 Sync data 31a, 31b Tracking pattern 50 Start data 53a, 3b first tracking pattern 55 synchronization data 56 second tracking pattern 57 block ID

Claims (3)

[Claims] 1. A plurality of line sensors for reading audio data recorded on a digital sound track of a movie film, a switching means for switching and outputting each audio data read by the plurality of line sensors, and a plurality of the plurality of line sensors. A movie having switching control means for detecting the audio data read in an accurate tracking state among the audio data read by the line sensor and switching the switching means so that the audio data is output. Audio data playback device for film. 2. The digital sound track recorded on the motion picture film has audio data recorded in a direction orthogonal to the moving direction of the motion picture film, and tracking patterns are provided on both sides of the recording track of the audio data. Is recorded, and each of the plurality of line sensors is provided so that each reading area is located within a recording track width of the audio data in a direction orthogonal to the moving direction of the motion picture film. The audio data reproducing apparatus for a motion picture film according to claim 1. 3. The digital sound track recorded on the motion picture film has audio data recorded in a direction orthogonal to the moving direction of the motion picture film, and at a predetermined recording track interval of the audio data,
A tracking pattern is recorded in a direction orthogonal to the moving direction of the motion picture film, and each of the plurality of line sensors has a reading area within a recording width of the tracking pattern in a direction orthogonal to the moving direction of the motion picture film. The audio data reproducing apparatus for a motion picture film according to claim 1, wherein the audio data reproducing apparatus is provided so as to be located at the position.