JPH05250860A - Multimedium device - Google Patents

Abstract

PURPOSE:To carry a device and to handle the multimedium information of a video signal, a voice signal and so on without holding it by hand and a strap. CONSTITUTION:A signal read out of a CD-ROM by a reading-out section 20 is corrected at an error correction section 22 and sent to a buffer memory 23. After the reading errors of a vibration, etc., are corrected by the buffer memory 23, the signal is sent to a demultiplexer 24, a multiplexed video and a voice and separated and send to their individual decoders. The video signal is made to a regenerative signal at a stereoscopic image decoding section 25 and outputted to an image output section 26 as a strereoscopic image signal. The voice signal is made to the regenerative signal at a voice signal decoder 27 and outputted from a voice output section 28 as a stereo sound.

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 or reproducing information, and more particularly to an apparatus for recording / reproducing multimedia information such as image signals and audio signals compressed and encoded as digital signals.

[0002]

2. Description of the Related Art In recent years, a CD-ROM or the like has been used as a medium for recording so-called multimedia information in which a plurality of pieces of information such as audio information such as music and announcements are recorded together with image information such as photographs, movies and videos. There are optical recording media such as optical discs and video tapes, and devices for recording and reproducing information on these recording media have been receiving attention.

[0003]

However, in the apparatus for recording / reproducing the multimedia information recorded on the CD-ROM or the video tape, the image signal is a stationary VDT (video display terminal) together with the audio signal. It is generally output to a device such as a portable display, and even if a small display that can be carried is used, it must be held by a hand or a strap, which is inconvenient and a portable device excellent in portability. At present, there is nothing that can be called. Therefore, it is an object of the present invention to solve the above-mentioned drawbacks and to provide a device which can be carried and can handle multimedia information such as an image signal and an audio signal without being held by a hand or a strap.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems and to achieve the object, therefore, the present invention comprises a reading means for reading out an image signal or an audio signal compressed and encoded and recorded in a recording medium, Decoding means for decoding the image signal or audio signal recorded by the compression encoding, a synchronous output means for converting the time axis of the audio signal and outputting the image signal and the audio signal in synchronization with each other, and a user's head A multimedia device that can be mounted on a face or face and that has a reproducing means for reproducing the image signal and the audio signal, and a switching means for switching an output signal reproduced by the reproducing means according to a user's intention of use. It was done.

[0005]

According to the multimedia device of the present invention, the image signal and the audio signal which are compression-encoded and recorded on the recording medium are read out, and the image signal or the audio signal which is compression-encoded and recorded are decoded, When the time axis of the audio signal is converted and the image signal and the audio signal are output in synchronization with each other, and the output signal is reproduced by a reproducing means that can be worn on the head or face of the user, the user's use The output signal to be reproduced can be switched according to the intention, and the multimedia information can be reproduced interactively. Further, since the image signal and the audio signal are reproduced by the glasses-type display which is a reproducing means that can be worn on the head or face of the user, the information can be easily reproduced without holding them by the hand or the strap.

When the multimedia device of the present invention handles three-dimensional image data, the signal reproducing means is constructed as follows. The first image, which is either the right image or the left image, is motion-compensated inter-frame predictive coding, and the remaining second image is the parallax information between the predicted signal of the first image and the left and right image signals used for the predictive coding. Is used to obtain the prediction signal of the second image, and the prediction error signal with the prediction signal is encoded. Therefore, since the encoder and the decoder use the same locally decoded signal to obtain the prediction signal, error accumulation does not occur. Further, the reproducing apparatus for the three-dimensional image signal encoded in such a manner includes a signal reading unit for reading an image signal and an audio signal from a recording medium, an error correcting unit for performing error correction, and an error correcting unit for correcting the error. Temporary storage means for temporarily storing the output, image signal decoding means for decoding the image signal read from the temporary storage means at appropriate timing, and audio signal decoding for decoding the audio signal recorded together with the image signal And a time axis conversion means for converting the time axis of the audio signal, and outputs the image signal and the audio signal as a right signal and a left signal, respectively.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 is a diagram for explaining a usage state of the multimedia device of the present invention. As shown in FIG. 1 (A), a reproducing unit 1 including an optical disk drive is fixed to a waist by a belt, and image signals and audio signals are sent to a face-mounted display (hereinafter FMD) 2 by a cable so that a user can see a stereoscopic image. You can enjoy the video and stereo sound. The reproducing unit 1 is provided with a cursor moving device 3 as shown in FIG.
The cursor is moved on the screen by operating 3d, and the process is switched by selecting the menu on the screen with the select button 3e. That is, the cursor moving device 3 as a pointing device for the display screen.
It realizes so-called interactivity that is accessed by.

A detailed description of the FMD2 is omitted because it is disclosed in Japanese Patent Application No. 3-295874 filed earlier by the present applicant, but FIG. A brief description will be given using. Reference numeral 10 represents the head of the user, and 11 represents the eyeball.
Is a glasses-type headphone-equipped display that holds 12 to 17 parts on the face. In the signal processing unit 12 with a built-in speaker, while reproducing the audio signal, the image signal is displayed on the self-emission type two-dimensional display element 13, and the image signal is formed, the imaging lens 14, the wedge-shaped prism 15 for bending the optical axis, and the aperture stop 1.
6 and an aspherical concave mirror 17 are used to project the image inside the eyeball. This image and audio signal processing is performed independently for right and left. The present apparatus uses the self-emission type two-dimensional display element 13 so that the virtual image formed by the aspherical concave mirror 17 can be positioned at an appropriate position according to the diopter of the eyeball.
It has the function of moving and adjusting the position of in the optical axis direction.

In this embodiment, the signal is sent from the reproducing unit 1 to the FMD 2 by using a cable, but the signal may be sent by using wireless or light such as infrared rays. In that case, by providing a receiving unit for those signals inside the FMD 2, it is possible to realize cordlessness, and a plurality of people can simultaneously view the same information by a plurality of FMDs 2 having the same receiving function. Further, as the cursor moving device 3, a device using a joystick or a trackball may be used in addition to the device using the moving direction instruction button shown in FIG. 1B. There is no problem even if the image information to be handled is not a three-dimensional data but a normal two-dimensional image.

Next, the structure of the reproducing section 1 of this embodiment using a CD-ROM as a recording medium will be described with reference to FIG. The reading unit 20 includes an optical pickup for reproducing the CD-ROM, a reproducing amplifier, and a demodulation circuit. The signal recorded according to the signal of the control unit 21 is read from the set CD-ROM, and the reading unit 20 reads the signal. The error correction unit 22 performs error correction on the received signal and sends it to the buffer memory 23. Buffer memory 23 for shock calibration
Is composed of a buffer memory for correcting a read error such as vibration and its controller, and sends the corrected signal to the demultiplexer 24. Demultiplexer 2
In 4, the multiplexed image and audio bit streams are separated and sent to individual decoding units. The image signal is converted into a reproduction signal by the stereoscopic image decoding unit 25 and output to the image output unit 26 as a stereoscopic image signal. The audio signal is converted into a reproduction signal by the audio signal decoding unit 27, and is output as stereo sound from the audio output unit 28.

At this time, a control signal is output from the demultiplexer 24 to the controller 29, and the voice and the image are reproduced synchronously under the control of the controller 29.
The control unit 21 instructs the reading unit 20 to read the address of the CD-ROM so as to switch the signal to be reproduced in accordance with the input from the pointing device unit 30 including the cursor moving device 3 and its interface shown in FIG. 1B. To change. Further, the control unit 21 also outputs a signal to the controller 29 to change the volume and the display of the screen according to the input from the pointing device unit 30. In this embodiment, the CD-ROM is used as the recording medium, but the recording medium is not limited to this, and if a medium having a low error rate such as a large capacity solid-state memory is used, the error correction unit 22 and the buffer memory are used. 23 is no longer needed.

FIG. 4 shows a configuration in a bus format when the cursor moving device 3 shown in FIG. 1B is used as the pointing device 30 in this example. User input from the cursor movement device interface 32
U33 issues signals to control each input / output. CD
-ROM interface 34 reads out the information of the address according to the control signal and corrects the read error such as error correction and vibration. The audio signal and the image signal demultiplexed by the CPU 33 are respectively sent to the audio board 3
5 and the video board 36. Audio board 3
Reference numeral 5 decodes the audio data encoded by the ADPCM system, and outputs it via the D / A converter. Video board 3
6 has a function of decompressing a compressed moving image, editing and displaying the compressed moving image, and substantially the same processing can be performed on a still image. At this time, the audio signal and the image signal are controlled so as to be output in synchronization. In this way, multimedia information can be reproduced interactively. Further, it is possible to connect a printer interface and a communication function to the bus so as to be able to deal with the case where the handled multimedia information includes character information and the like.

FIG. 5 is a diagram showing the construction of an input / output device to which a recording function of a three-dimensional image signal and a recording function of voice are added in the multimedia device of the present invention. When the magneto-optical disk 40 is used as a recording medium. Shows the signal flow of.
Right and left image signals are input from the image input terminals 41 and 42, respectively, converted into digital signals by the A / D conversion circuits 43 and 44, and then encoded by the stereoscopic image compression circuit 45. On the other hand, at this time, the audio signals are input from the audio input terminals 46 and 47 for the right and left respectively, and the A / D conversion circuit 4
The time axis conversion circuit 50 converts the time axis via 8, 49. Then, the multiplexing circuit 51 multiplexes the image signal and the audio signal, the error correction code adding circuit 52 adds the error correction code, the recording modulation circuit 53 performs recording modulation, and the recording amplifier 54 and the recording head 55 perform the magneto-optical disk. Recorded at 40. Further, the error correction code adding circuit 5
2 has a buffer memory that corrects a data read / write error due to a shock, solves a problem caused by vibration when carrying the apparatus, and realizes portability.

To reproduce the recorded information, the signal is read by the optical pickup 56 and the signal obtained by the reproduction amplifier 57 and the demodulation circuit 58 is incorporated in the vibration correction buffer memory like the error correction code adding circuit 52. Error correction circuit 59
The image signal and the audio signal are separated by the separation circuit 60, the image signal is decoded by the stereoscopic image decoding circuit 61, passes through the D / A conversion circuits 62 and 63, and the right and left signals are imaged. It is output to the output terminals 64 and 65. In addition, the audio signal is separated from the image signal and then the time axis conversion circuit 66
The D / A conversion circuit 67 as a signal synchronized with the image signal,
After being converted by 68, right and left audio signals are output from the audio output terminals 69 and 70, respectively. The audio signal handled in this embodiment may of course be compressed and encoded. In that case, the time axis conversion circuit 50 is an audio signal encoding circuit and the time axis conversion circuit 66 is an audio signal decoding. Include each circuit.

This three-dimensional image signal input / output device is provided with both recording and reproducing functions. In contrast to the reproduction-only embodiment shown in FIG. 3, recording functions are shown as 41 to 55 in FIG. Since the means described above is added, the interactivity and usability are the same as those of the embodiment shown in FIG. 3, and it can also be used as a video and audio recording device by connecting a video camera with a built-in microphone.

Next, the stereoscopic image compression circuit 45 shown in FIG.
Some embodiments of the stereoscopic image decoding circuit 61 will be described. Prior to this description, a conventional compression method will be described.

As a moving image compression method, there is generally used a method proposed by ISO (see the Institute of Image Electronics Engineers, Vol. 20, No. 4) to achieve high compression by utilizing inter-frame correlation. is there. This method will be briefly described with reference to FIG. First, the prediction error signal obtained by subtracting the motion-compensated inter-frame predicted image by the difference circuit 200 is the DCT circuit 201.
After the DCT is performed for each block, the quantization circuit 202 quantizes the result, and a variable length code is assigned to the quantization result by the encoding circuit 203 and recorded. Further, the quantization result is the inverse quantization circuit 204 and the inverse DCT circuit 2
The motion compensation prediction circuit 207 having a built-in image memory having a variable delay function for motion compensation is decoded by the adder circuit 206 and added by the addition circuit 206 to the motion compensation interframe prediction image. I try to make prediction images.

By the way, in general, a three-dimensional image has a strong correlation between the left and right images. Therefore, using this method independently for the left and right signals of the three-dimensional image means that the correlation between the left and right images is large. It is not efficient because the redundant components of are not completely removed.

As a method for encoding a stereo moving image, in Japanese Patent Laid-Open No. 2-131697, disparity vector information, which is a vector representing a shift between left and right images, is used in a motion compensation inter-frame difference signal. Parallax-compensated prediction is performed in order to realize highly efficient stereo video coding. However, in this method, the motion-compensated interframe prediction is performed for both the left and right signals, and then the parallax compensation is performed. Therefore, the correlation between the left and right images is reduced at the stage of the motion-compensated interframe prediction. However, there is a drawback in that parallax compensation is difficult to perform, its effect is reduced, and processing is complicated.

The present invention solves the above-mentioned drawbacks and uses a method for encoding a three-dimensional image signal with high efficiency, which method will be described below with reference to the drawings.

FIG. 6 is a diagram showing the configuration of the first embodiment of the stereoscopic image compression circuit 45 of the embodiment described in FIG. 80
Is a right image input terminal, 81 is a left image input terminal, 82 is a motion compensation prediction circuit, 83 is a parallax compensation prediction circuit, and 84 is a DCT.
Circuit, 85 is a quantization circuit, 86 is an inverse quantization circuit, 87 is an inverse DCT circuit, 88 is an encoding circuit, 90 is an addition circuit, 9
Reference numerals 1 and 92 are difference circuits, and 93 and 94 are switching circuits.

The input image has been decomposed into luminance and color difference signals or RGB signals and has already been digitized, and the processing is performed on the blocks.

First, the right image signal input from the right image input terminal 80 is subjected to the motion compensation prediction circuit 8 by the difference circuit 91.
The difference from the output of 2, that is, the difference from the motion compensation prediction signal predicted from the signal of the previous frame is obtained. Then, the difference signal is D
It is CTed and quantized by the quantization circuit 85. The quantization result is divided into two, and one of the signals is assigned a variable length code by the encoding circuit 88 and output. The other one of the signals is decoded by the inverse quantizing circuit 86 and the inverse DCT circuit 87, and the motion compensation prediction signal predicted from the previous frame signal is added by the adding circuit 90 to form a locally decoded signal. It is input to the motion compensation prediction circuit 82. The motion compensation prediction circuit 82 outputs the prediction signal and the motion vector of the right image of the next frame obtained by the block matching with the next frame. Then, the prediction signal is also sent to the parallax compensation prediction circuit 83. The parallax compensation prediction circuit 83 obtains and outputs the predicted image of the left image and the parallax vector by matching the predicted signal of the right image and the left image.

Next, the difference between the left image signal input from the left image input terminal 81 and the prediction signal from the parallax compensation prediction circuit 83 is calculated by the difference circuit 92, and this difference signal is sent to the left image input terminal side. The DCT circuit 84 performs DCT via the switched switching circuit 93, and the quantization circuit 85 quantizes. The quantized result is different from the one in the right image,
The coding circuit 88 allocates a variable-length code and outputs it without halving it. That is, the processing after the inverse quantization circuit 86 is not performed.

The motion vector and the disparity vector are recorded together with the code data of the image signal for each block. Since the parallax vector is generated only by the parallax of the left and right images, the direction of the vector is only the left and right direction, and its size is limited by the maximum parallax. Therefore, the search area for finding the parallax vector finds the motion vector. It is good in a very narrow range compared to the time. According to the stereoscopic image compression circuit 45 of the present embodiment, motion compensation prediction only needs to be performed for the right image, which is advantageous in terms of circuit scale and processing time.

FIG. 7 is a diagram showing a first embodiment of the stereoscopic image decoding circuit 61. 100 is a variable length code decoding circuit, 1
Reference numeral 01 is an inverse quantization circuit, 102 is an inverse DCT circuit, 103 is a motion compensation prediction circuit, 104 is a parallax compensation prediction circuit, and 105.
Is a right image output terminal, 106 is a left image output terminal, 107,
Reference numeral 108 is an adder circuit, and 109 is a switching circuit. The code data for each block of the right image is the variable length code decoding circuit 100.
Is decoded by the inverse quantization circuit 101 and the inverse DCT circuit 102 to be converted into an interframe difference signal, and is added by the addition circuit 107 to the prediction signal from the motion compensation prediction circuit 103. The result is the right image output terminal 105.
In addition to being output, it is input to the motion compensation prediction circuit 103 to obtain a prediction signal of the next frame. The motion compensation prediction circuit 103 outputs a motion compensation prediction signal for the next frame based on the reproduced image signal and the motion vector sent together with the image code data.

Next, the coded data of the left image is decoded by the variable length code decoding circuit 100 in the same manner as the right image, and is returned to the difference signal with the parallax compensation prediction signal by the inverse quantization circuit 101 and the inverse DCT circuit 102. By switching the switching circuit 109, this difference signal is input to the adding circuit 108. The addition circuit 108 causes the parallax compensation prediction circuit 1
The prediction signal from 04 and the difference signal are summed up and output from the left image output terminal 106. Parallax compensation prediction circuit 10
Reference numeral 4 outputs a prediction signal for the right image from the motion compensation prediction circuit 103 and a prediction signal for parallax compensation for the left image according to the parallax vector sent together with the image code data.

Although not shown in FIGS. 5 to 7,
The operation of each circuit in the above figure is performed by the control unit 21 shown in FIG.
And is controlled by the controller 29. Further, the three-dimensional image encoding algorithm of the present invention is
It is mainly used for moving images, and when there is no preceding frame in the first frame of the image, intraframe coding performed at regular intervals, processing when there is a scene change, etc. have already been performed. It is based on the general moving image compression method. Therefore, in the above-described embodiment, the circuit for intra-frame processing and the circuit for controlling the same are omitted.

A second embodiment of the stereoscopic image compression circuit 45 of the present invention will be described with reference to FIG. In the figure, the same members as those described in FIG. 6 are designated by the same reference numerals, and detailed description thereof will be omitted. This embodiment differs from the embodiment of FIG. 6 in that
Decoded by the inverse quantization circuit 86 and the inverse DCT circuit 87,
A signal obtained by adding the motion compensation prediction signal predicted from the previous frame signal by the adder circuit 90 to form a local decoded signal is input to the motion compensation prediction circuit 82 and the parallax compensation prediction circuit 83. is there. Therefore, in the first embodiment, the left image is further predicted from the prediction signal of the right image obtained from the right image of the previous frame, but in the second embodiment, the prediction signal of the left image is predicted from the right signal at the same time. Since it is obtained from the reproduced signal of the image, the left image is predicted from the signal without the prediction error of the right image, and the prediction error can be reduced, and the left image does not need to be locally decoded.

An embodiment of the stereoscopic image decoding circuit 61 for the stereoscopic image compression circuit 45 has the configuration shown in FIG.
The reproduction signal of the right image is input to the parallax compensation prediction circuit 104 that creates the prediction signal of the left image.

Further, a third embodiment of the stereoscopic image compression circuit 45 of the present invention will be described with reference to FIG. In the figure, the same members as those described in FIG. 6 are designated by the same reference numerals,
Detailed description is omitted. This embodiment is the first shown in FIG.
The difference from the embodiment is that the left image motion compensation prediction circuit 89,
The addition circuit 95 and the switching circuit 96 are provided, and the compression method of the left image is changed. This point will be described below.

The right image is almost the same as that of the first embodiment, and therefore its explanation is omitted. The left image is compressed by selecting a preferable one from the above-described prediction signal from the parallax compensation prediction circuit 83 and the prediction signal obtained by the motion compensation prediction obtained in the same manner as in the right image, and performing coding using the difference signal between them. I am trying to change. That is, the motion compensation prediction circuit 8 for the left image
9 or the output signal from the parallax compensation prediction circuit 83 is selectively switched by the switching circuit 96 to be a prediction signal, and the prediction error is coded and recorded similarly to the right image, and after dequantization, A signal decoded by inverse DCT and the prediction signal are added by an adding circuit 95 and input to a left image motion compensation prediction circuit 89 as a local decoded signal.

With such a configuration, it becomes possible to select the optimum prediction method according to the movement of the three-dimensional object. For example, in a scene where there is almost no motion, the error in inter-frame prediction is very small, so the output of the left image motion compensation prediction circuit 89 is selected, and when the motion is large, the output of the parallax compensation prediction circuit 83 is selected. I am trying to choose. The switching at this time is controlled by the control unit 21 (not shown) by determining the motion vector of the right image from the motion compensation prediction circuit 82. Then, the motion compensation prediction circuit for left image 89 obtains the motion vector for the left image by using the vicinity of the motion vector of the right image as a search area. This is because the motion vectors of the right image and the left image have very close values, and the motion vector of the right image may be used as it is as the motion vector of the left image.

FIG. 11 is a diagram showing an embodiment of a decoder for a signal encoded by the method shown in FIG. In the figure,
The same members as those described in FIG. 7 are designated by the same reference numerals, and detailed description thereof will be omitted. This embodiment differs from the embodiments shown in FIGS. 7 and 9 in that a left-image motion compensation prediction circuit 110 and a switching circuit 111 are provided according to the embodiment of FIG. There is a point to do.

The code data for each block of the right image is decoded by the variable length code decoding circuit 100, and the inverse quantization circuit 10
1 and the inverse DCT circuit 102 restores the inter-frame difference signal, and the adder circuit 107 mixes it with the prediction signal from the motion compensation prediction circuit 103. The result is output from the right image output terminal 105, and
It is input to the motion compensation prediction circuit 103 and the parallax compensation prediction circuit 104 to obtain the next prediction signal. The motion compensation prediction circuit 103 outputs a motion compensation prediction signal for the next frame based on the reproduced image signal and the motion vector sent together with the image code data.

Next, the coded data of the left image is decoded by the variable length code decoding circuit 100 in the same manner as the right image, and is returned to the difference signal from the prediction signal by the inverse quantization circuit 101 and the inverse DCT circuit 102. This difference signal is transferred to the switching circuit 11
Disparity compensation prediction circuit 1 selectively switched by 1
04 prediction signal and left image motion compensation prediction circuit 110
Any of the prediction signals from the above is added by the adding circuit 108, and output from the left image output terminal 106. Here, the output of the parallax compensation prediction circuit 104 or the left image motion compensation prediction circuit 110 is selected by the switching circuit 111 by using the signal included in the code data as the selection information. Shown compression circuit 45
The control circuit 96 controls so as to select the same output as the selected output.

Further, FIG. 12 is a diagram showing a fourth embodiment of the stereoscopic image compression circuit 45 of the present invention. In the figure, the same members as those in the above-mentioned embodiment are designated by the same reference numerals, and detailed description thereof is omitted. First, the encoding method for the right image is the same as that of the above-described embodiment, but the left image is encoded after the inter-frame prediction of the parallax compensation prediction error and the difference is further taken. That is, in the parallax compensation prediction circuit 83, the predicted image of the left image is obtained by matching the locally decoded signal of the right image and the left image, and the difference between the predicted image of the left image and the left image is obtained as the first prediction error signal, The second prediction error signal is obtained by further calculating the difference with the prediction signal of the first prediction error signal of the current frame obtained from the first prediction error signal. This second prediction error signal is DCT, quantized, and coded. The locally decoded signal of the first prediction signal is input to the left image inter-frame prediction circuit 90 by adding the dequantized and inverse DCT decoded signal and the second prediction signal. With such a configuration, it is possible to perform prediction corresponding to the movement of a three-dimensional object without selecting a prediction method.

[0038]

As described above in detail with reference to the embodiments, according to the multimedia device of the present invention, the image signal or the audio signal which is compression-encoded and recorded on the recording medium is read out, and the compression is performed. The encoded image signal or audio signal is decoded, the time axis of the audio signal is converted, the image signal and the audio signal are output in synchronization, and this output signal is output to the head or face of the user. When the reproduction is performed by the attachable reproduction means, the output signal to be reproduced can be switched according to the user's intention of use, and the multimedia information can be reproduced interactively. Further, since the image signal and the audio signal are reproduced by the glasses-type display which is a reproducing means that can be mounted on the head or face of the user,
It is possible to provide a multimedia device which can reproduce information without being held by a hand or a strap and can be easily carried.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a usage state of a multimedia device of the present invention.

FIG. 2 is a diagram for explaining an outline of a face-mounted display (FMD).

FIG. 3 is a diagram showing a configuration of an embodiment of a reproducing unit using a CD-ROM as a recording medium.

FIG. 4 is a diagram showing a configuration of an embodiment of a multimedia device of the present invention in a bus format.

FIG. 5 is a diagram for explaining an embodiment in which a recording function of a three-dimensional image signal and a recording function of voice are added to the multimedia device of the present invention.

FIG. 6 is a diagram for explaining a first embodiment of a stereoscopic image compression circuit 45 in the embodiment described in FIG.

FIG. 7 is a diagram for explaining the first embodiment of the stereoscopic image decoding circuit 61 in the embodiment described in FIG.

FIG. 8 is a diagram for explaining a second embodiment of the stereoscopic image compression circuit 45 in the embodiment described in FIG.

9 is a diagram for explaining a second embodiment of the stereoscopic image decoding circuit 61 in the embodiment described in FIG.

FIG. 10 is a diagram for explaining a third embodiment of the stereoscopic image compression circuit 45 in the embodiment described in FIG.

FIG. 11 is a diagram for explaining a third embodiment of the stereoscopic image decoding circuit 61 in the embodiment described in FIG.

FIG. 12 is a diagram for explaining a fourth embodiment of the stereoscopic image compression circuit 45 in the embodiment described in FIG.

FIG. 13 is a diagram for explaining a conventional image compression method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Playback unit 2 Face-mounted display (FMD) 3 Cursor moving device 20 Reading unit 21 Control unit 22 Error correction unit 23 Buffer memory 24 Demultiplexer 25 Stereoscopic image decoding unit 26 Image output unit 27 Audio signal decoding unit 28 Audio output unit 29 Controller 30 Pointing device section 45 Stereoscopic image compression circuit 50 Time axis conversion circuit 51 Multiplexing circuit 52 Error correction code addition circuit 59 Error correction circuit 60 Separation circuit 61 Stereoscopic image decoding circuit 66 Time axis conversion circuit 82, 103 Motion compensation prediction circuit 83 , 104 Parallax compensation prediction circuit 93, 94 Switching circuit

Claims (1)

[Claims] 1. A reading means for reading an image signal or an audio signal compressed and recorded on a recording medium, a decoding means for decoding the image signal or the audio signal compressed and encoded, and an audio signal. The time axis is converted, the synchronous output means for outputting the image signal and the audio signal in synchronization with each other, and the reproducing means which can be mounted on the head or face of the user and which reproduces the image signal and the audio signal. A multimedia device, comprising: switching means for switching an output signal reproduced by the reproducing means according to a user's intention of use.