JPS5843950B2 - Dougazou Hologram Memory Souch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a memory device for outputting audio and moving images to a display device such as a television (hereinafter abbreviated as TV) or videophone.

Traditionally, VTRs have been used as this type of device, but
It is not widely available because it is expensive.

Recently, an image memory device has been announced under the name of video package that is cheap enough to be displayed on a TV in ordinary homes.

For example, E VR, selector vision, etc.
Like conventional image memory, EVR is a reduced-sized pot frame image that is printed, so high-density recording is difficult when considering scratches on the recording medium.

In this respect, Selecta Vision records each frame image using a hologram recording method, which is advantageous for increasing density.

However, neither EVR nor Selecta Vision records audio and image information in the same way.

This means that the audio signal has a ~8KHz band and the image signal has a ~4MHz band.
This is because, unlike in the z-band, in order to synchronize sound and image, it is necessary to read them out at different readout speeds.

This invention provides a memory device that records audio and image signals using holograms, but it is not only a completely different system from selector vision, but also uses a method that records audio and image signals on the same microscopic hologram. It has the excellent feature that it can be read out at the same speed.

The purpose of this invention is to perform Fourier transform in one dimension, and to record image signals and audio signals for one horizontal scan on each micro hologram that forms an image in the other dimension, to form micro holograms and images as many as the number of horizontal scans. The object of the present invention is to provide a multiplexing device that obtains audio and moving images by arranging them in the same direction, and simultaneously generates a plurality of audio and moving images by taking advantage of the features of high-density recording and high-speed reading.

According to this invention, a laser, a one-dimensional optical deflector, and an image signal are encoded (for example, AM for a black and white image).

Encoded to FM, PCM, etc., even if it is a color image or a line drawing, P
For commercials and analog images, the brightness signal is AM and the color signal is FM.
It is conceivable to encode it as

) and audio signals (AM, FM, PCM.

6M modulation) is recorded in multiple tracks in the form of one-dimensional Fourier transform holograms, and the hologram tape is wound around a tape feeding mechanism that moves in synchronization with the line period of the TV. It includes a photodetector array, a signal converter that demodulates encoded signals, and a control device, and irradiates reproduction light onto one minute hologram on a synchronously moving hologram tape to record a horizontal scan. A moving image hologram memory device that obtains a moving image by repeating the operation of sequentially reading out the image signal and the audio signal for 1 frame in time series and forming one frame of screen and the operation of generating sound is obtained.

Furthermore, the hologram tape used in this invention adopts a method of recording a one-dimensional Fourier transformed image of a two-dimensional data mask using a two-dimensional data mask as input data.

The two-dimensional data mask records image signals and audio signals for horizontal scans in the Fourier transform direction, and is created in such a manner that it is divided into the number of horizontal scans in the imaging direction.

Therefore, a micro hologram array of a plurality of frames is created on the hologram tape, which is subjected to Fourier transformation in the track direction and an image is formed in the movement direction.

Furthermore, when reading this hologram tape, the horizontal frequency of the NTSC system used in Japan and the United States is 15.7.
Since the frequency is 5 KHz, in order to obtain a horizontal scanning signal for one screen at a time, both the image signal and the audio signal need to be read out at a speed of t/1575 KHz, main 63.5 μs.

In this case, if the audio signal is recorded by PCM and the audio signal is recorded by making one minute hologram correspond to one sample point, the audio band will be 15.75 according to the sampling theorem.
KHz / 2:8KHz If you record a signal of 2 sample points / 1 minute hologram, the audio band will be 15.
75 KHz - 16/2, which provides high-performance audio.

Furthermore, when converting an audio signal into a POM, 8 bits/l sample is sufficient, so if the band needs to be 8 kHz, you only need to add an 8-bit signal, and if you need a band of 16 kHz, just add a 16-bit signal to the l horizontal image signal. .

Conventionally announced one-dimensional Fourier transform hologram memory stores one-dimensionally arranged digital data (
The most famous one is one in which a one-dimensional Fourier transform hologram of a linear array of holes is calculated by a computer and the results are written on photographic film using an electron beam.

For example, the magazine ``Proceedings Fall Jointly Computer Conference (PROCEE)''
DINGSFALL JOINT COMPUTERC
0NFERENCE) J, 1966, pp. 729-734, ``A System for Recording Digital Data on Photographic Film Using Multiple Grating Patterns''
IGITAL DATA ON PH-OTOGRAP
HICFILM USING SUPERI-MPO8
In ED GRATING PATTERNS), a grating is recorded on a film by a CRT (cathode ray tube), as shown in FIG. 9 in the text.

In addition, other academic journals such as the IEE Journal of Quantum Electronics (IEE Journal of Quantum Electronics)
URNAL OF QUA-NTUM ELECTRo
NIcs), June 1969 issue, pp. 333-334, ``Binary hologram digital memory (A
BINARY HO-LOGRAM DIGITAL
In MEMORY) J, a binary hologram written with an electron beam is recorded and reproduced on a rotating body.

In holograms created by these methods, the one-dimensional Fourier transform image written is in binary form and has limited resolution, so the reproduced image has a lot of noise and the number of bits recorded per hologram is extremely limited. You can't do too much.

Further, the information that can be written in an l hologram is one-dimensional information, and in order to record two-dimensional information, a large number of these holograms must be lined up.

The present invention has been made in this respect.

In the present invention, audio and image information are encoded, and a two-dimensional matrix image in which the number of horizontal scanning lines is encoded in the column direction and the audio and image information in the horizontal scanning line is encoded in the row direction is converted into a one-dimensional Fourier image in the row direction using a lens. converted and recorded as a hologram.

In other words, a two-dimensional image is m rows x n information (for audio, PCM
, if it is an image, AM and FM are each represented by a bit band), this means that m one-dimensional Fourier transform machines have been created, and compared to the conventional creation method described above, only 7m exposures are required. become.

By sequentially feeding the recording medium in the column direction and exposing it to light, holograms of any length can be created.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows a hologram production method used in the present invention.

Monochromatic coherent light 1 is focused onto recording medium 4 by cylindrical lens 2 .

In this optical path, each row includes one of the television displays.
The image information required for horizontal scanning and the audio information to be output per horizontal scanning time are coded and recorded in m lines, that is, the data mask 3 (encoding method) is recorded with the image information and audio information required for m horizontal scanning. As an example, in the 3' portion of each row, image information corresponding to the horizontal scanning order of the television display is represented sequentially from left to right in the figure as AM, that is, grayscale information, and in the 3% portion, audio information is expressed as quantum information. number 8 bit P
In order to express it as a CM, the 3// part is divided into 8 one-dimensional parts, each of which is a PCM code l''.

(represented by "white" (transparent) and "black" (opaque) corresponding to the "O" signal), and the Fourier transformed image of the data mask 3 is placed on the recording medium 4 along the X axis. An image is formed in the direction, and interference fringes between the coherent light 1 and the monochromatic coherent reference light 6 from the same light source are recorded on the recording medium 4, and a hologram 5 is formed.

This hologram 5 has spatial correspondence with the data mask 3, and each horizontal scanning audio and image information 3a, 3b is recorded on the minute holograms 5a, sb.

In this case, a Fresnel diffraction image is formed in the column direction (y direction), but if a telescopic lens system or the like is used, an image of the data mask 3 can be formed in the column direction.

After forming the hologram of the pig mask 3, the recording medium 4 is moved in the y direction by a distance of one hologram, replaced with the data mask 3, and the next hologram is recorded.

Furthermore, in order to create adjacent hologram rows (that is, hologram rows with multiple tracks), the lens 2 and the reference beam 6 may be moved in the X direction by one track to create holograms with different data masks.

With this method, the reproduction lines from the holograms of multiple tracks aligned in the X direction are imaged at the same location.

This principle can be easily understood from the fact that the position of the data mask 3 is not moved.

In this way, a hologram tape with audio and image information recorded thereon is created.

FIG. 2 shows a method of reproducing audio and visual information from the hologram tape 5.

The monochromatic reproduction light T is irradiated onto the minute hologram 5a from the direction opposite to the reference light 6 in FIG. 1, and one horizontal scanning sound and image information 3a are obtained as a reproduction image.

This reproduced image is received by a light-receiving element array 8 such as a one-dimensional solid-state scanner, sequentially converted into electrical signals by a start pulse from a timing circuit 9, and converted into audio and image signals so that they can be input to a display device through an amplifier circuit 10. Do the following.

When the recording medium 4 is moved in the y direction, the reproduction light 7 enters successive minute holograms sb and 5c, and horizontal scanning audio and image information corresponding to these minute holograms are successively obtained as reproduced images. , which is converted into an electrical signal and read out by the light receiving element array 8.

The hologram creation and readout method explained in FIGS. 1 and 2 is the simplest method, and high density is possible by using the features of holograms.

For example, after recording a hologram of one data mask 3 and reference beam 6, it is possible to multiplex record holograms of different data masks 3 and reference beams 6' at the same location.

Using this method, high-density recording can be achieved by recording the luminance signal of the color image in the data mask corresponding to the reference light 6, and the color signal and audio signal of the color image in the data mask Z corresponding to the reference light 6'. Not only this, but also the luminance signal (for example, 3a), the color signal, and the audio signal (for example, 3a') can be simultaneously read out from different locations by simply irradiating coherent light onto the same minute hologram 5a during readout.

The light receiving element arrays 8, 8' read out the signals 3as3a' at the same timing, and the amplifier circuits 10a, 10a' respectively.
After amplification, signal processing is performed to obtain audio and image signals.

In addition, in the explanation so far, we have only described recording one horizontal scanning sound and image information in one minute hologram, but
One horizontal scanning information can also be recorded on multiple holograms.

When performing this on a color image, record a luminance signal in one micro hologram, a color signal and an audio signal in the next micro hologram, and when reading out both micro holograms, if coherent light is irradiated at the same time, the luminance signal, color signal, and audio signal are recorded. are obtained as reproduced images 3a, 3a', and an audio image signal can be obtained by the same operation as in the case of multiplex recording.

FIG. 3 shows an embodiment of a moving image hologram memory device according to the present invention.

A light beam 12 emitted from a laser light source 11 is deflected in one dimension in the X direction by a light deflection means 14 such as an ultrasonic deflector equipped with a control device 13 that generates different frequencies according to an input address signal. .

The deflected light beam is converted by the lens 15 into a light beam traveling parallel to the optical axis of the lens, and the horizontal frequency 15 of the TV is
．． The audio and image information is transmitted to the first
The light is incident on one minute hologram 17a of an arbitrary hologram track 17a of the hologram tape 17 recorded by the method of the illustrated embodiment.

The reproduced image 18 from the minute hologram 11a1 (for example, image information corresponds to 18' and audio information corresponds to 181).

) are detected by a light receiving element array 19 such as a plurality of one-dimensional solid-state scanners, and sequentially converted into electrical signals by a start pulse from a timing circuit 20.

This electrical signal is converted into an audio signal and an image signal by a signal conversion circuit 21 and transmitted to a display device such as a TV.

The format of information recorded on any track 17a of the hologram tape 11 is as follows.

Assuming that the width of the micro hologram 11a1 in the moving direction is 3 mm, the feeding speed of the hologram tape is a/63.5 (m1
1L/μS), the number of horizontal scanning lines required for one frame is Hn
Then, the length of the tape to record a 1 minute video is a-Hn
・30 sheets/second ・60 seconds-180 (la-Hn)

For example, if a = 0.1'' p Hn = 500, the feed speed is 1,58 m/s, and the required tape length is 90 m/s.
m/min.

Recording is performed in the same manner on the other tracks 17b to 17i.

Next, the operation of this embodiment will be explained.

When an address signal is given to the control device 13, the light beam 1
2 is irradiated onto a designated hologram track of the hologram tape 17, for example, 17c.

Next, move the feeding mechanism 16 to move the hologram track 17c.
An image signal is sequentially read out from the first minute hologram and placed on a horizontal scanning line to display a moving image on a display device, and an audio signal is output from a speaker through DA conversion or the like.

If the readout time of the reproduced image of l minute hologram is 1 horizontal scanning time 1/l 5.75KHz = 63.5μS, only l moving image can be obtained from this memory, which is 63.5μs.
/ M moving images can be obtained by time division.

However, in this case, M buffer memories are required, and the writing time is 63.5 μs/M buffer memories.The resolution of the M buffer memories is equal to the reconstructed image resolution (1 horizontal scanning information amount) from 1 minute hologram.

However, it is clear that the storage capacity can be significantly reduced compared to the buffer memory required for multiplexing two-dimensional images.

Although the above explanation has been made using a tape feeding mechanism, it is clear that similar effects can be obtained by using a disc-shaped rotating body such as a record.

As detailed above, this invention records audio and image information as a one-dimensional Fourier transform hologram and moves it in synchronization with one horizontal frequency of the TV, so it is possible to record many images compactly, and it is also easy to multiplex. A moving image hologram memory device is obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the hologram creation method used in the present invention,
FIG. 2 is a diagram showing a hologram reproduction method according to the present invention, and FIG. 3 is a diagram showing an embodiment of a moving image hologram memory device according to the present invention. In the figure, 1, 6, 6'... monochromatic coherent light, 2... cylindrical lens, 3...
...Data mask that includes image information in audio, 4...
... Recording medium, 5.17 ... Hologram,
1, 12...Reproduction light, 8.8', 19...
... Light receiving element array, 9, 20 ... Timing circuit, 10 ... Amplifying circuit, 11 ... Monochromatic light source, 13 ... Control device, 14・・・・・・
Light deflection means, 15...Lens, 16...
・Feeding mechanism, 21...Signal conversion circuit.

Claims (1)

[Claims] 1 A coherent light source, a light deflection means for accessing a light beam from the light source to a predetermined location, and a device that records image and audio information corresponding to at least one horizontal scanning time in one line as an optical image of a television display, etc. Using a two-dimensional data mask consisting of multiple pieces, Fourier transform is performed in the row direction, and in the column direction, a large number of Fourier transform images of the number of focused columns and one-dimensional Fourier transform holograms of the number of columns referenced by the reference beam are sequentially generated. a recording medium recorded on the recording medium, a feeding mechanism to which the recording medium is attached and moves in synchronization with the line period of the display device, and a reproduced image reproduced from any one of the one-dimensional Fourier transform holograms in the recording medium. a light-receiving element array for photoelectrically converting the light, and a device for converting the electric signal obtained from the light-receiving element array into an image or audio signal, and at least one horizontal beam at a time from the hologram selected by the coherent light source and the light deflection means. A moving image hologram memory device characterized in that the operation of reproducing information necessary for scanning is repeated to supply moving images and audio signals to the display device.