JPH06194757A - Film feed speed detecting device, and recording device and regenerating device for motion picture film - Google Patents

Abstract

PURPOSE:To detect the actual traveling unevenness of a film by detecting the pass of a perforation part by a detecting part to detect the feed speed of the film. CONSTITUTION:A film feed speed detecting device is provided with a detecting part 10 for detecting the presence of a perforation part 2 provided on a motion picture film 1, and the pass of the perforation part 2 is detected by the detecting part 10 to obtain the detection signal of the pass speed of the perforation part 2 or the frequency proportional to the feed speed of the movie film 1. The device is also provided with a record clock generating part for generating the record clock of voice data synchronously to the detection of the frequency proportional to the pass speed of the perforation part 2 obtained by the detecting part 10 to optically record the voice data in a digital pattern recording area provided near the perforation part 2 as a digital pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feed speed detecting device, a motion picture film recording device and a reproducing device, and more particularly to a technique for recording and reproducing a digital pattern as a sound track of a motion picture film.

[0002]

2. Description of the Related Art Generally, in a film feeding mechanism in a motion picture film recorder or a projector, film running irregularity is detected by detecting the rotational speed of a film running motor, and the film frame is fed at a constant speed. I was trying to do it. Also, the soundtrack of a conventional motion picture film is constructed by optically recording an analog signal. On the other hand, the applicant has already applied for a technique for recording a digital pattern in order to improve the sound quality of voice (Japanese Patent Application Nos. 3-222342 and 3-265).
001).

[0003]

By the way, when projecting such a motion picture film, it is required to reproduce sound with a high sense of reality. In addition, there is a problem in that stable audio data cannot be obtained due to lateral roll of the film caused by feeding the film. In general, a motion picture film reproducing device cannot be expected to have a reproduction accuracy like that of a tape feeding of an audio reproducing device, and therefore it is desired to stabilize reproduced digital data.

As described above, in the conventional film feeding mechanism, the uneven running of the film is indirectly detected by detecting the rotation speed of the motor for running the film, so that the voice data is recorded as a digital pattern. If the film slips for some reason during playback,
There is a possibility that recording / playback of audio data may not be possible.

The present invention has been made based on such a background and has the following objects.

That is, an object of the present invention is to provide a film feed speed detecting device capable of detecting the actual running irregularity of the film.

Another object of the present invention is to provide a motion picture film recording apparatus capable of reliably optical recording audio data as a digital pattern in a digital pattern recording area of a motion picture film regardless of running irregularity of the motion picture film. To provide.

Still another object of the present invention is to provide a movie film capable of reliably reproducing audio data optically recorded as a digital pattern in a digital pattern recording area of the movie film, regardless of uneven running of the movie film. It is to provide a reproducing apparatus.

[0009]

In order to solve the above-mentioned problems, a film feed speed detecting apparatus according to the present invention comprises a detecting section for detecting the presence or absence of a perforation section provided on a film, and It is characterized in that the film feeding speed is detected by detecting the passage of the perforation section.

A motion picture film recording apparatus according to the present invention is a recording apparatus for optically recording audio data as a digital pattern in a digital pattern recording area provided in the vicinity of a perforation part of a motion picture film, A detection unit for detecting the presence or absence of a perforation unit, and a recording clock for generating a recording clock for the audio data in synchronization with a detection signal of a frequency proportional to the passage speed of the perforation unit obtained by the detection unit. And a generating unit.

Further, the motion picture film reproducing apparatus according to the present invention is a reproduction apparatus for reproducing audio data optically recorded as a digital pattern in a digital pattern recording area provided in the vicinity of a perforation portion of the motion picture film, A detection unit for detecting the presence or absence of the perforation unit provided in the motion picture film, and a reproduction clock of the audio data are generated in synchronization with a detection signal of a frequency proportional to the passage speed of the perforation unit obtained by the detection unit. And a reproduced clock generating section for performing the same.

[0012]

In the film feed speed detecting device according to the present invention,
The detection unit for detecting the presence or absence of the perforation portion provided on the film detects the passage of the perforation portion to detect the feed speed of the film.

Further, in the motion picture film recording apparatus according to the present invention, the motion picture film is synchronized with a detection signal having a frequency proportional to the passing speed of the perforation part, which is obtained by the detection part for detecting the presence or absence of the perforation part. The recording clock is generated by the recording clock generator,
Audio data is optically recorded as a digital pattern in a digital pattern recording area provided near the perforation section.

Further, in the motion picture film reproducing apparatus according to the present invention, it is synchronized with the detection signal of the frequency proportional to the passing speed of the perforation part obtained by the detection part for detecting the presence or absence of the perforation part provided in the motion picture film. A reproduction clock is generated by the reproduction clock generation unit, and the audio data optically recorded as a digital pattern in the digital pattern recording area provided near the perforation unit is reproduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the film feed speed detecting device, the motion picture film recording device and the reproducing device according to the present invention will be described below in detail with reference to the drawings.

The film feed speed detecting apparatus according to the present invention is, for example, as shown in FIG. 1, a detecting section 1 for detecting the presence or absence of a perforation section 2 provided on a motion picture film 1.
0, the detection unit 10 detects the passage of the perforation unit 2 to detect the perforation unit 2
To obtain a detection signal of a frequency proportional to the passing speed of the motion picture film, that is, the moving speed of the motion picture film 1.

In this embodiment, the detection unit 10 is
As shown in FIG. 2, the light emitting diode 10A and the phototransistor 10B are made of a transmissive photointerrupter which is arranged to face each other with a predetermined gap G therebetween. In the detection unit 10 composed of such a transmissive photo interrupter, when the perforation portion 2 of the film 1 is located in the gap G, the light from the light emitting diode 10A passes through the perforation portion 2 and the phototransistor. When the film area between the perforation portions 2 is positioned in the gap G by irradiation of 10B,
The light applied to the phototransistor 10B is shielded by the film region, so that a detection signal corresponding to the presence or absence of the perforation portion 2 is output. Therefore, the detection unit 10 outputs a detection signal having a frequency proportional to the passing speed of the perforation unit 2, that is, the feeding speed of the motion picture film 1.

The detecting section 10 may be composed of, for example, a reflection type photo interrupter or a capacitance type proximity sensor in addition to the transmission type photo interrupter of this embodiment.

A motion picture film recording apparatus according to the present invention is constructed, for example, as shown in FIG.

This motion picture film recording apparatus is an application of the film feed speed detection device shown in FIG. 1 described above, and a detection unit for detecting the presence or absence of the perforation unit 2 provided in the motion picture film 1. 10 and a recording clock generation unit 20 for generating a recording clock of audio data in synchronization with a detection signal obtained by the detection unit 10 and having a frequency proportional to the passing speed of the perforation unit 2.
And the audio data is optically recorded as a digital pattern in a digital pattern recording area provided in the vicinity of the perforation portion 2 of the motion picture film 1.

The recording clock generation section 20 detects the passage of the perforation section 2 from the 96 Hz frequency signal obtained by detecting the detection section 10 from the frequency signal of 44 Hz.
The recording clock of 1 kHz is generated by the PLL, and as shown in FIG. 4, it comprises a phase comparator 21, a loop filter 22, a voltage controlled oscillator 23, an N frequency divider 24 and an M frequency divider 25. The phase comparator 21 performs a phase comparison between the 96 Hz frequency signal obtained from the detection unit 10 and a signal obtained by dividing the oscillation output signal of the voltage controlled oscillator 23 by N by the N divider 24. The phase error is supplied to the voltage controlled oscillator 23 as a control voltage via the loop filter 22. The voltage controlled oscillator 23
The oscillation phase is controlled and controlled by the control voltage. Then, M × 4 obtained by the voltage controlled oscillator 23
By dividing the 4.1 kHz oscillation output signal by M by the M divider 25, a recording clock of 44.1 kHz is generated.

In such a recording clock generator 20,
It is possible to generate a recording clock of 44.1 kHz in synchronization with the 96 Hz frequency signal obtained from the detection unit 10.

Further, as shown in FIG. 3, the motion picture film recording apparatus includes a multi-channel tape recorder 30.
From the first and second conversion circuit units 31A and 31B, which compresses 8-channel audio data supplied from the device and converts it into dot pattern data. First and second optical recording units 32A and 32B for performing optical recording according to pattern data
As shown in FIG. 5, 8-channel audio data is recorded as a digital pattern in the digital pattern recording areas 5 and 6 provided in the vicinity of the perforation section 2 of the motion picture film 1 as shown in FIG.

The motion picture film 1 is provided with a perforation section 2 for conveying the motion picture film for projection, an image recording area 3 for recording an image to be projected, and audio reproduction even with conventional equipment. An analog voice data section 4 provided with optical recording of analog voice,
And digital pattern recording areas 5 and 6 recorded outside the perforations 2 provided on the left and right of the motion picture film.

The first and second conversion circuit units 31A and 3A
1B processes audio data of 8 channels supplied from the multi-channel tape recorder 30 by 4 channels, and data compression processing circuits 34A, 34A, which operate in accordance with the synchronization signals provided by the synchronization signal generator 33, respectively. 34B, sectorizing circuits 35A, 35B, E
CC encoders 36A, 36B and modulation circuits 37A, 3
It consists of 7B.

Then, the data compression processing circuit 34A.
Performs data compression processing for compressing the data amount to ⅕ by performing high-efficiency coding that combines band-division coding, orthogonal transform coding, bit allocation, and the like, for four-channel audio data. Similarly, the data compression processing circuit 3
The 4B performs a data compression process for compressing the data amount to 1/5 by performing high-efficiency coding that combines band-division coding, orthogonal transform coding, bit allocation, and the like on the audio data of the other four channels.

As shown in FIG. 6, the sectorizing circuit 35A sets the audio data for four channels compressed by the data compression processing circuit 34A to 1 as shown in FIG.
696 bytes of data and 20 bytes of sector ID and 4
A byte CRC is added to generate sector data of 40 × 43 = 1720 bytes. Similarly, the sectorization circuit 35B converts 1964 bytes of data into 20 bytes of sector I for the other four channels of audio data compressed by the data compression processing circuit 34B.
40 × 43 = 172, with D and 4-byte CRC added
Generates 0 bytes of sector data.

Further, the ECC encoder 36A has 36 bytes of C2 parity for every 40 bytes of data in the diagonal direction as shown by the broken line in FIG. 6 for the audio data of 4 channels sectorized by the sectorizing circuit 35A. And further, 19 bytes of C1 parity is generated for every 76 bytes of data in the horizontal direction. Similarly, the ECC encoder 36B includes the sectorizing circuit 35B.
For 4 channels of audio data sectorized by, 36 bytes of C for every 40 bytes of data in the diagonal direction
Two parities are generated, and further 19 bytes of C1 parity is generated for every 76 bytes of data in the horizontal direction.

Further, the modulation circuit 37A is the EC
The voice data to which the C2 parity and the C1 parity are added by the C encoder 36A is converted to 1 by the 8-9 conversion.
The byte data is converted into dot pattern data represented by 9 dots and output. Similarly, the modulation circuit 37B is
C2 parity and C1 by the ECC encoder 36B
For the voice data to which the parity is added, 1-byte data is converted to dot pattern data represented by 9 dots by 8-9 conversion and output.

Here, 40 bytes of voice data and 36 bytes of C2 parity and 19 bytes of C1 parity are 95 bytes as one block, and one block of 95 bytes of data is shown in FIG. 7 by each of the modulation circuits 37A and 37B. As shown, 80 dots are set as one track, 16 tracks are set as one block, and a block sync for one track is provided for each block, and 57 dots × 15 tracks are allocated.

Further, the first and second optical recording sections 32A, 3A
2B includes buffer memories 38A and 38B, laser light sources 39A and 39B, spatial modulators 40A and 40B, and converging lenses 41A and 41B, respectively.

The buffer memories 38A and 38B operate according to the recording clock generated by the recording clock generating section 20, and the first and second conversion circuit sections 31 are operated.
The dot pattern data from A and 31B are sequentially supplied to the spatial modulators 40A and 40B. The spatial light modulators 40A and 40B have the laser light sources 39A and 39B.
The laser light from is optically modulated according to the dot pattern data. Then, data is recorded by irradiating the respective digital pattern recording areas 5 and 6 of the motion picture film 1 with laser light which is optically modulated in accordance with the dot pattern data by the spatial modulators 40A and 40B.

As described above, in the motion picture film recording apparatus of this embodiment, it is proportional to the passing speed of the perforation section 2 obtained by the detection section 10 for detecting the presence or absence of the perforation section 2 provided in the motion picture film 1. Since the recording clock that is synchronized with the frequency detection signal is generated by the recording clock generation unit 20, the recording clock that follows the actual running unevenness of the motion picture film 1 can be obtained, and the recording clock is provided in the vicinity of the perforation unit 2. The audio data can be surely optically recorded as a digital pattern in the digital pattern recording areas 5 and 6.

The motion picture film reproducing apparatus according to the present invention is constructed as shown in FIG.

This motion picture film reproducing apparatus is an application of the film feed speed detecting device shown in FIG. 1 described above, and a detecting section for detecting the presence or absence of the perforation section 2 provided in the motion picture film 1. 10 and a reproduction clock generation unit 50 that generates a reproduction clock of audio data in synchronization with a detection signal of a frequency proportional to the passing speed of the perforation unit 2 obtained by the detection unit 10.
And a CCD line sensor 51 for converting the digital patterns of the digital pattern recording areas 5 and 6 of the motion picture film 1 recorded by the recording device shown in FIG.
The audio signal is read from A and 51B, and an audio signal is reproduced from the audio data by digital processing using the reproduction clock.

Here, the reproduced clock generating section 50 is
Similar to the recording clock generation unit 20 in the above-described recording apparatus, the PLL generates a 44.1 kHz reproduction clock synchronized with the 96 Hz frequency signal obtained by detecting the passage of the perforation unit 2 by the detection unit 10. It is like this.

In the motion picture film reproducing apparatus, the digital patterns in the respective digital pattern recording areas 5 and 6 of the motion picture film 1 are transferred to the CCD rain sensors 41.
Regarding each dot pattern data obtained by reading with A, 41B, each modulation circuit 3 of the above-mentioned recording device is caused by each demodulation circuit section 52A, 52B which operates according to the reproduction clock supplied from the reproduction clock generation section 50.
9-8 conversion processing corresponding to 8-9 conversion in 1A and 31B is performed, and 9-dot pattern data is demodulated into 1-byte data.

Also, using the C1 parity and C2 parity demodulated by the demodulation circuit sections 52A and 52B, error correction processing is performed on each audio data in each error correction circuit 53A and 53B, and compressed audio is obtained. Data, C2 parity, and C1 parity are reproduced on the memory 54.

Further, in the data expansion processing circuit 55 which operates according to the reproduction clock supplied from the reproduction clock generation section 50, data corresponding to the data compression processing in each of the data compression processing circuits 34A and 34B of the recording apparatus described above. By performing the expansion processing, the audio data of each channel is reproduced.

As described above, in the motion picture film reproducing apparatus of this embodiment, it is proportional to the passing speed of the perforation section 2 obtained by the detection section 10 for detecting the presence or absence of the perforation section 2 provided in the motion picture film 1. Since the reproduction clock that is synchronized with the frequency detection signal is generated by the reproduction clock generation unit 50, a recording clock that follows the actual running unevenness of the motion picture film 1 can be obtained, and the reproduction clock is provided in the vicinity of the perforation unit 2. The audio data optically recorded as digital patterns in the digital pattern recording areas 5 and 6 can be reliably reproduced.

[0041]

In the film feed speed detecting apparatus according to the present invention, the film feed speed is detected by detecting the passage of the perforation section by the detection section for detecting the presence or absence of the perforation section provided in the film. It is possible to detect the actual running unevenness of the vehicle.

Further, in the motion picture film recording apparatus according to the present invention, the motion picture film is synchronized with the detection signal of the frequency proportional to the passing speed of the perforation part, which is obtained by the detection part for detecting the presence or absence of the perforation part. Since the recording clock is generated by the recording clock generation unit, it is possible to obtain the recording clock that follows the actual running unevenness of the motion picture film, and the audio data is digitally recorded in the digital pattern recording area provided near the perforation unit. As a result, optical recording can be reliably performed.

Further, in the motion picture film reproducing apparatus according to the present invention, it is synchronized with the detection signal of the frequency proportional to the passing speed of the perforation part obtained by the detection part for detecting the presence or absence of the perforation part provided in the motion picture film. Since the reproduction clock is generated by the reproduction clock generation unit, it is possible to obtain the reproduction clock that follows the actual running unevenness of the motion picture film, and the optical recording is performed as a digital pattern in the digital pattern recording area provided near the perforation unit. The reproduced audio data can be reliably reproduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a fill feed speed detection device according to the present invention.

FIG. 2 is a diagram schematically showing a structure of a transmissive photointerrupter used in a detection unit in the fill feed speed detection device.

FIG. 3 is a block diagram showing the configuration of a movie file recording apparatus according to the present invention.

FIG. 4 is a block diagram showing a specific configuration of a recording clock generation unit in the recording apparatus.

FIG. 5 is a diagram schematically showing a recording format of a movie film in which audio data is recorded by the recording device.

FIG. 6 is a diagram schematically showing a sector structure of audio data recorded on a motion picture film by the recording device.

FIG. 7 is a diagram schematically showing a block structure of audio data recorded on a motion picture film by the recording device.

FIG. 8 is a block diagram showing the structure of a motion picture film reproducing apparatus according to the present invention.

[Explanation of symbols]

 1 ... Movie film 2 ... Perforation unit 5, 6 ... Digital pattern recording unit 10 ... Detection unit 10A ...・ ・ ・ Light emitting diode 10B ・ ・ ・ ・ ・ Phototransistor 20 ・ ・ ・ Recording clock generator 34A, 34B ・ ・ ・ Data compression processing circuit 36A, 36B ・ ・ ・ ECC encoder 37A, 37B・ ・ ・ Modulation circuit 38A, 38B ・ ・ ・ Buffer memory 39A, 39B ・ ・ ・ Laser light source 40A, 40B ・ ・ ・ Spatial modulator 50 ・ ・ ・ ・ ・ ・ Regenerated clock generation unit 51A, 51B ・ ・ ・ CCD Line sensor 52A, 52B ... Demodulation circuit 53A, 53B ... Error correction circuit 55 ... Data expansion processing circuit

Claims (3)

[Claims] 1. A film feed speed detection device, comprising: a detection unit for detecting the presence or absence of a perforation unit provided on the film, wherein the detection unit detects passage of the perforation unit to detect the film feed speed. apparatus. 2. A recording device for optically recording audio data as a digital pattern in a digital pattern recording area provided in the vicinity of a perforation portion of a motion picture film, the presence or absence of the perforation portion provided in the motion picture film being detected. A movie comprising: a detection unit; and a recording clock generation unit that generates a recording clock of the audio data in synchronization with a detection signal of a frequency proportional to the passage speed of the perforation unit obtained by the detection unit. Film recorder. 3. A reproducing apparatus for reproducing audio data optically recorded as a digital pattern in a digital pattern recording area provided in the vicinity of a perforation portion of a motion picture film, the presence or absence of the perforation portion provided in the motion picture film. And a reproduction clock generation unit that generates a reproduction clock of the audio data in synchronization with a detection signal of a frequency proportional to the passage speed of the perforation unit obtained by the detection unit. A movie film player.