JP3107053B2 - Film recording device and film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording audio information on a film and a recorded film, and more particularly to a digital audio recording track provided on a film in addition to an analog audio recording track. , A film recording apparatus and a recorded film.

[0002]

2. Description of the Related Art Conventionally, cinema digital sound (CD) has been used as an audio system for opening a new world for movie viewing.
S) has been proposed (Movie TV Technology, 1991/1)
(461), P65-79). This cinema digital
Sound records digital audio information in the part used as an analog audio recording part on movie film,
When this movie film is shown, the digital audio information is optically read by a pickup head to reproduce an audio signal.

[0003]

However, in such a conventional digital sound track recording / reproducing method, digital audio information is written in place of analog audio information, so that compatibility with the conventional one is completely lost. There was a problem. An object of the present invention is to solve such a problem.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a film for recording an audio signal, comprising: an analog audio recording track for recording the audio signal; and a film provided in parallel with the analog audio recording track for recording the audio signal. The above object is achieved by providing a device having a digital audio recording track.

In the above arrangement, the analog audio recording track records an audio signal to be recorded in an analog format. A digital audio recording track provided in parallel with this also records an audio signal to be recorded in digital form.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an example of an audio information writing apparatus and a film to which an embodiment of a digital sound track recording / reproducing method on a cinema film according to the present invention is applied.

First, the film 4 will be described. As can be seen from FIG. 1, the perforations 6 are openings provided at substantially equal intervals in the feed direction of the film 4,
It engages with a film feed mechanism used at the time of film recording / reproduction, so that the film can be fed reliably. As shown in FIG. 1, the picture section 5 is provided at substantially equal intervals in the feed direction on the film 4 and is an area where an image is captured. The analog audio recording track 7 is shown in FIG.
As shown in FIG. 3, it is provided on the film 4 so as to extend in the feed direction, and audio information to be recorded is recorded in an analog format. As can be seen from FIG. 1, the digital audio recording track 8 is provided on the film 4 so as to extend in the feed direction. In other words, the digital audio recording track 8 is provided in parallel with the analog audio recording track 7, and the audio information to be recorded is digital. It is recorded in the format.

Next, the audio information writing device will be described. The audio information writing device shown in this figure includes a digital audio recording unit 1 and an analog audio recording unit 2,
Analog audio information is fetched from the audio master tape 3 and recorded on an analog audio recording track 7 provided between the picture section 5 on the film 4 and the perforation 6, and two channels of main audio are recorded from the audio master tape 3. Information (main audio information)
And four-channel surround sound information (sub sound information), and compresses a part of the sound data to record digital sound provided between the picture section 5 on the film 4 and the analog sound recording track 7. Record on track 8.

The digital audio recording section 1 has a digital audio information processing circuit 10 and a digital audio information writing mechanism 11, and fetches two channels of main audio information from the audio master tape 3 and converts it to "16" bits. And digital audio data of four channels is fetched from the audio master tape 3 and converted into digital audio data of "4" bits, which are then time-multiplexed to obtain digital audio data. Record on track 8. The digital audio information processing circuit 10 includes two A / D conversion circuits 1 as shown in FIG.
2, an audio compression encoder circuit 14, a clock generation circuit 15, a time axis multiplexing circuit 16, an error correction code adding circuit 17, an interleave circuit 18, and a modulation circuit 19. The main audio information of two channels is fetched from the master tape 3 and converted into digital audio data of "16" bits. The surround audio information of four channels is fetched from the audio master tape 3 and the digital audio data of predetermined bits is fetched. After conversion to data, the digital audio data is compressed into "4" -bit digital audio data, and these digital audio data are time-multiplexed to generate digital audio data serving as write information.
Feed to 1.

An A / D conversion circuit 12 fetches two channels of main audio information from the audio master tape 3 and A / D converts it to generate "16" -bit digital audio data for each channel. Then, this is supplied to the time axis multiplexing circuit 16. Also, the other A / D
The conversion circuit 13 is provided for the audio master tapes 3 to 4.
In addition to taking in the surround sound information of the channel, the surround sound information is A / D converted to generate digital audio data of a predetermined bit for each channel, and this is supplied to the audio compression encoder circuit 14. The audio compression encoder circuit 14 takes in four channels of digital audio data output from the other A / D conversion circuit 13, compresses the digital audio data for each channel, and generates "4" bit data for four channels. Is supplied to the time axis multiplexing circuit 16 as digital sub audio data.

A clock generation circuit 15 generates a clock signal at predetermined time intervals and divides the clock signal into a time axis multiplexing circuit 16.
And a film feed signal is generated at a timing corresponding to the clock signal, and is supplied to a film feeder (not shown) for the film 4 to feed the film 4. The time axis multiplexing circuit 16 outputs two channels of digital audio data output from the A / D conversion circuit 12 based on the clock signal output from the clock generation circuit 15 and outputs the digital audio data from the audio compression encoder circuit 14. The digital audio data of four channels is taken in, and these are time-division multiplexed.
The digital audio data for one track shown in (1) is created and supplied to the error correction code adding circuit 17.

An error correction code adding circuit 17 takes in the digital audio data output from the time axis multiplexing circuit 16 and creates an error correction code corresponding to the digital audio data. Then, as shown in FIG. The error correction code is added to the audio data and supplied to the interleave circuit 18. The interleave circuit 18 fetches and temporarily stores the digital audio data in track units output from the error correction code adding circuit 17, blocks the digital audio data of several tracks, interleaves them, and processes the processed digital audio data. The data is supplied to the modulation circuit 19. The modulation circuit 19 takes in the digital audio data output from the interleave circuit 18, generates spatial modulation data from the digital audio data, and supplies this to the digital audio information writing mechanism 11.

The digital audio information writing mechanism 11 includes a laser light source 20, a collimator lens 21,
A spatial light modulator 22 and an imaging lens 23 are provided, and a laser beam is generated by a laser light source 20 and condensed on the spatial modulator 22 by a collimating lens 21.
The laser light is spatially modulated by a spatial modulator 22 based on the spatial modulation data output from the digital audio information processing circuit 10, and the modulated laser light obtained by this spatial modulation operation is converted by the imaging lens 23 into the film 4. An image corresponding to the modulated laser light is recorded by condensing light on a digital audio recording track 8 provided between the upper picture section 5 and the analog audio recording track 7.

When a driving voltage is supplied, the laser light source 20 generates a laser beam and outputs the laser beam to the collimator lens 2.
Feed to 1. The collimator lens 21 collimates (condenses) the laser light output from the laser light source 20 and supplies the collimated light to the incident side of the spatial modulator 22. The spatial modulator 22 has a plurality of shutter arrays, and selectively operates each shutter based on the spatial modulation data output from the digital audio information processing circuit 10 to spatially modulate the laser light. The modulated laser light obtained by the spatial modulation operation is supplied to the imaging lens 23.

The imaging lens 23 takes in the modulated laser light supplied from the spatial modulator 22 and converts it into a digital audio signal provided between the picture section 5 on the film 4 and the analog audio recording track 7. Recording track 8
Then, an image corresponding to the modulated laser light is optically recorded as shown in FIG. In addition, the analog audio recording unit 2
1 includes an analog audio information processing circuit 25 and an analog audio information writing mechanism 26 as shown in FIG. 1. The analog audio information is fetched from the audio master tape 3 and write light having a width corresponding to the analog audio information is written. The analog audio information is generated and recorded on an analog audio recording track 7 provided between the picture section 5 on the film 4 and the perforation 6.

As shown in FIG. 6, the analog audio information processing circuit 25 includes an amplifier 27 for receiving and amplifying an analog audio signal from the audio master tape, fetching an analog audio signal from the audio master tape 3, and amplifying the signal. And supplies it to the analog audio information writing mechanism 26. The analog audio information writing mechanism 26 includes a lamp 28, a first slit plate 29, a galvanomirror 30, a second slit plate 31, and an imaging lens 32, as shown in FIG. The analog audio signal output from the circuit 25 is fetched to generate writing light having a width corresponding to the analog audio signal, and the write light is generated by the analog audio signal provided between the picture section 5 on the film 4 and the perforation 6. The light is focused on the recording track 7 and an image corresponding to the value of the analog audio signal is recorded.

When a driving voltage is supplied, the lamp 28 emits light to generate a light beam, which is supplied to a first slit plate 29. The first slit plate 29 is constituted by a plate-like member 36 having a triangular slit 35 formed in the center portion. The first slit plate 29 takes in the light beam supplied from the lamp 28 to make the light beam into a triangular shape. To supply. The galvanomirror 30 is connected to the amplifier 27
The angle of the mirror is controlled according to the value of the analog audio signal output from the second slit plate 31 while switching the emission direction of the light beam supplied from the first slit plate 29.
To supply. The second slit plate 31 is constituted by a plate-like member 33 having a horizontally elongated slit 24 formed in the center, and selectively passes a part of the light beam supplied from the galvanomirror 30 to correspond to the analog audio signal. The writing light having the specified width is generated and supplied to the imaging lens 32. The imaging lens 32 takes in the light beam supplied from the second slit plate 31 and forms an image on an analog audio recording track 7 provided between the picture section 5 on the film 4 and the perforation 6. As shown in FIG. 7, an image corresponding to the analog audio signal is recorded.

As described above, in the audio information writing apparatus of this embodiment, the analog audio information is fetched from the audio master tape 3 and the analog audio recording track provided between the picture section 5 on the film 4 and the perforation 6. 7, the main audio information of two channels and the surround audio information of four channels are taken in from the audio master tape 3, and a part thereof is compressed and the picture section 5 on the film 4 and the analog audio are recorded. Since recording is performed on the digital audio recording track 8 provided between the recording track 7 and the conventional analog audio recording track 7, the number of bits required for each channel of digital audio recording is secured while leaving the conventional analog audio recording track 7. Which allows for compatibility with legacy It is possible to record digital audio of channels.

FIG. 8 is a block diagram showing an example of an audio information reproducing apparatus to which an embodiment of a digital sound track recording / reproducing method on a movie film according to the present invention is applied. The audio information reproducing apparatus shown in FIG.
And an analog audio reproducing unit 41 and a selecting unit 42. When the film 4 is shown, the analog audio information recorded on the analog audio recording track 7 on the film 4 is read and reproduced. At the same time, the digital audio information recorded on the digital audio recording track 7 of the film 4 is read out and reproduced, and either one of the analog audio signal or the digital audio signal is selected by the selecting section 42, and this is reproduced. The signal is supplied to an amplifying device (not shown) and is output from a speaker or the like.

The digital audio reproducing section 40 includes a digital audio information pickup mechanism 43 and a digital audio information reproducing circuit 44. When the film 4 is shown, the digital audio recorded on the digital audio recording track 8 is recorded. After reading the audio information, the audio information is reproduced and supplied to the selection unit 42. The digital audio information pickup mechanism 43 includes an LED light source 45 and a slit plate 4 as shown in FIG.
6, a condenser lens 47, an imaging lens 48, and a line sensor 49. When the film 4 is screened, the LED light source 45 emits light, and the obtained LED light is transmitted to the film 4. The digital audio data is focused on the digital audio recording track 8 on the line 4, and digital audio data corresponding to the LED light transmitted through the digital audio recording track 8 is generated by the line sensor 49 and supplied to the digital audio information reproducing circuit 44. . The LED light source 45 is disposed so as to face the digital audio recording track 8 of the film 4, emits light to generate LED light when a driving current is supplied, and supplies the LED light to the slit plate 46. The slit plate 46 is constituted by a plate-like member 51 having a horizontally long slit 50 formed in a central portion, and converts the LED light obtained by the LED light source 45 into one.
The condensing lens 47 is formed in the shape of a track (a horizontally long shape).
To supply. The condensing lens 47 takes in the horizontally long LED light obtained by the slit plate 46 and condenses it on the digital audio recording track 8 of the film 4.

The imaging lens 48 receives the LED light transmitted through the digital audio recording track 8, magnifies the LED light by a factor of “6”, and forms an image on the line sensor 49. The line sensor 49 includes a plurality of light detecting elements arranged in a line, and converts the LED light condensed by the imaging lens 48 into an electric signal by each light detecting element to convert the LED light into an electric signal. And reproduces the digital audio data recorded on the digital audio data reproduction circuit 44. In this case, since the LED light imaged on the line sensor 49 is enlarged by “6” times by the imaging lens 48, the smallest dot recorded on the digital audio recording track 8 on the film 4 Is 10 μm and the size of each photodetector of the line sensor 49 is 15 μm, the “1” dot on the film 4 is a photodetector on the line sensor 49. "
Digital audio data is reproduced by being assigned to 4 "pieces, and supplied to the digital audio information reproducing circuit 44.

The digital audio information reproducing circuit 44 includes a demodulation circuit 55 and an error correction decoder circuit 56 as shown in FIG.
An error check circuit 57, a main / sub separation circuit 58,
The digital audio information pickup mechanism 4 includes an audio expansion decoder circuit 59, a memory circuit 60, a controller 61, and two D / A conversion circuits 62 and 63.
After the digital audio data output from the digital audio data 3 is fetched and error-corrected, the error correction result is supplied to the selector 42, and the main audio information included in the digital audio data error-corrected by the error correction operation is output. , The surround sound information is separated into surround sound information, and the surround sound information is expanded. The surround sound information obtained by the expansion operation and the main sound information are D / A-converted into
A main audio signal of a channel and a surround audio signal of four channels are generated and supplied to the selection unit.

The demodulation circuit 55 fetches and demodulates digital audio data output from the digital audio information pickup mechanism 43, and then performs deinterleaving processing on the digital audio data obtained by this demodulation operation to perform a deinterleaving process for each track. Is reproduced and supplied to an error correction decoder circuit 56. The error correction decoder circuit 56 takes in the digital audio data output from the demodulation circuit 55 and uses the error correction code included in the digital audio data to determine whether the digital audio data contains an error. A check result is supplied to an error check circuit 57, and when the digital audio data contains an error, which can be corrected, the digital audio data is error-corrected and a main / sub separation circuit 58 is provided.
To supply.

The error check circuit 57 checks whether or not the digital audio data processed by the error correction decoder circuit 56 is uncorrectable based on the check result output from the error correction decoder circuit 56. If the correction is impossible, a digital voice unusable detection signal is generated and supplied to the selecting unit 42.
The main / sub separation circuit 58 takes in the digital audio data output from the error correction decoder circuit 56, and outputs two-channel digital audio data (main audio information) included in the digital audio data.
The digital audio data of two channels is supplied to the memory circuit 60 after being separated into digital audio data of channels (surround audio information), and the digital audio data of four channels is supplied to the audio expansion decoder circuit 59.

The audio decompression decoder circuit 59 takes in the four channels of digital audio data output from the main / sub separation circuit 58 and expands each of these digital audio data for each channel to obtain a predetermined number of bits of digital audio data. (Surround sound information) is generated and supplied to the memory circuit 60. The controller 61 generates an audio output command signal at a timing corresponding to the feeding of the film 4 and supplies the signal to the memory circuit 60. Memory circuit 60
Captures and stores 2-channel digital audio data output from the main / sub-separation circuit 58 and 4-channel digital audio data output from the audio decompression decoder circuit 59, and outputs an audio output command signal from the controller 61. Each time it is output, digital audio data for two channels corresponding to the track specified by the audio output command signal is read out and read out from one D / D.
In addition to supplying the digital audio data to the A / A conversion circuit 62, the digital audio data for four channels is read and supplied to the other D / A conversion circuit 63.

Each time the two-channel digital audio data is output from the memory circuit 60, the D / A conversion circuit 62 takes in the digital audio data and performs D / A conversion to generate a two-channel main audio signal. Is supplied to the selection unit 42. The other D / A conversion circuit 63 takes in the digital audio data of four channels from the memory circuit 60 and performs D / A conversion to generate a two-channel surround audio signal. The selection unit 4
Feed to 2. The analog audio reproducing unit 41 includes an analog audio information pickup mechanism 65 as shown in FIG.
And an analog audio information reproduction circuit 66. When the film 4 is shown, the analog audio information recorded on the analog audio recording track 7 on the film 4 is read out and reproduced to select the analog audio information. 42.

The analog audio information pickup mechanism 65 includes a xenon lamp 67 and a slit plate 68 as shown in FIG.
, A condensing lens 69, and a solar cell 70,
When the film 4 is shown, the xenon lamp 67
Is focused on an analog audio recording track 7 on the film 4 and the solar cell 7
At 0, the light transmitted through the analog audio recording track 7 is converted into an electric signal, which is supplied to an analog audio information reproducing circuit 66 as an analog audio signal.

The xenon lamp 67 is connected to the film 4
When the driving current is supplied, the light is emitted to generate light, which is supplied to the slit plate 68 as a light beam.
The slit plate 68 is constituted by a plate-like member 72 having a horizontally long slit 71 formed in a central portion, and supplies the light beam obtained by the xenon lamp 67 to the condenser lens 69 in a horizontally long shape. The condensing lens 69 takes in the oblong light beam obtained by the slit plate 68, condenses it on the analog sound recording track 7 of the film 4, and supplies the transmitted light to the solar cell 70. The solar cell 70 receives the light beam transmitted through the analog recording track 7, generates an electric signal having a magnitude corresponding to the light amount of the light beam, and supplies the electric signal to the analog audio information reproducing circuit 66.

As shown in FIG. 11, the analog audio information reproducing circuit 66 includes a decoder circuit 75 for decoding an electric signal output from the analog audio information pickup mechanism 65 to generate an analog audio signal. The electric signal output from the pickup mechanism 65 is decoded to generate an analog audio signal, which is supplied to the selection unit 42. When the digital audio reproduction unit 40 does not output the digital audio unusable detection signal, the selection unit 42 outputs the two-channel main audio signal and the four-channel surround audio signal output from the digital audio reproduction unit 40. The digital audio reproducing unit 41 selects the analog audio reproducing unit 41 and supplies the selected audio signal to the amplifying device to output audio from a speaker or the like.
And selects the analog audio signal output from the amplifier and supplies it to the amplifying device to output audio from the speaker or the like.

As described above, in the audio information reproducing apparatus according to this embodiment, when the film 4 is shown, the analog audio information recorded on the analog audio recording track 7 of the film 4 is read out to reproduce the analog audio signal. In addition, the digital audio information recorded on the digital audio recording track 8 of the film 4 is read out to reproduce the two-channel main audio signal and the four-channel surround audio signal. Analog audio information recorded on the audio recording track 7 and digital audio information recorded on the digital audio recording track 8 of the film 4 are simultaneously read out, and either of these audio information can be output from a speaker or the like. .

The analog audio signal recorded on the analog audio recording track 7 of the film 4 is read out to reproduce an analog audio signal.
Since the digital audio information recorded on the digital audio recording track 8 is read to reproduce the 2-channel main audio signal and the 4-channel surround audio signal, the digital audio recording track 8 may be read for any reason. When the digital audio information recorded on the analog audio recording track 7 cannot be reproduced to reproduce the 2-channel main audio signal and the 4-channel surround audio signal, the analog audio information recorded on the analog audio recording track 7 can be reproduced. The analog audio signal can be read out and reproduced, and can be output from a speaker or the like. Thus, in the worst case, the same level of audio can be reproduced as in the conventional case. In the embodiment described above, the digital audio recording track 8 is located between the picture section 5 on the film 4 and the analog audio recording track 7.
However, the digital audio recording track 8 may be provided between the analog audio recording track 8 and the perforations 6, between the perforations 6, between the picture sections 5, and the like.

[0032]

As described above, according to the present invention, digital audio recording can be performed while leaving the conventional analog audio recording track. Can be recorded.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of an audio information writing apparatus to which an embodiment of a digital sound track recording / reproducing method on a movie film according to the present invention is applied.

FIG. 2 is a block diagram showing a detailed circuit example of the digital audio information processing circuit shown in FIG.

FIG. 3 is a schematic diagram showing a format example of digital audio data created by the digital audio recording unit shown in FIG. 1;

FIG. 4 is a perspective view showing a detailed configuration example of a digital audio information writing mechanism and an analog audio information writing mechanism shown in FIG. 1;

FIG. 5 is a schematic diagram showing an example of a digital audio recording track created by the recording operation of the digital audio information recording unit shown in FIG.

FIG. 6 is a block diagram showing a detailed circuit example of the analog audio information processing circuit shown in FIG. 1;

FIG. 7 is a schematic diagram showing an example of an analog audio recording track created by a recording operation of the analog audio information recording unit shown in FIG.

FIG. 8 is a block diagram showing an example of an audio information reproducing apparatus to which an embodiment of a digital sound track recording / reproducing method on a movie film according to the present invention is applied.

9 is a perspective view showing a detailed configuration example of a digital audio information writing mechanism and an analog audio information writing mechanism shown in FIG.

10 is a block diagram showing a detailed circuit example of the digital audio information reproduction circuit shown in FIG.

11 is a block diagram illustrating a detailed circuit example of the analog audio information reproduction circuit illustrated in FIG. 8;

FIG. 12 is a plan view showing an example of a general movie film.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Digital audio recording part 2 Analog audio recording part 3 Audio master tape 4 Film 7 Analog audio recording track 8 Digital audio recording track 10 Digital audio information processing circuit 11 Digital audio information writing mechanism 25 Analog audio information processing circuit 26 Analog audio information writing mechanism

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Claims (7)

(57) [Claims] 1. A film recording apparatus for recording an audio signal on a film having an analog audio recording track, wherein the digital audio information is recorded to form a digital audio recording track parallel to the analog audio recording track. A film recording device comprising a writing unit. A clock generation unit for generating a clock time; and a film feed mechanism for feeding a film based on a clock generated by the clock generation unit. 2. The film recording apparatus according to claim 1, wherein the recording is performed based on a clock time. 3. The digital audio information writing section adds an error correction code to the digital audio information and records the interleaved information as a block. The film recording apparatus according to claim 1, wherein: 4. The film recording apparatus according to claim 1, further comprising an analog audio information writing section for recording the audio signal on an analog audio recording track. 5. A film recording apparatus for recording an audio signal on a film, comprising: an analog audio information writing unit for recording the audio signal on an analog audio recording track; And a digital audio information writing section for recording on a digital audio recording track provided. 6. A film for recording an audio signal, comprising: an analog audio recording track for recording the audio signal; and a digital audio recording track provided in parallel with the analog audio recording track and for recording the audio signal. A film comprising: 7. The film according to claim 6, further comprising perforation.