JPH0877707A - Reproducing device - Google Patents

Abstract

PURPOSE: To provide a reproducing device capable of outputting initial images, test images and test sounds with low costs without adding a circuit part specialized for image making. CONSTITUTION: This is a reproducing device capable of outputting videos and sounds by decoding compressed video/audio data. Data of already compressed initial images, test images and sounds are stored and held in ROM 56 connected to a system controller 53 beforehand and these data are read when power is switched ON or in accordance with the conditions for a test mode and output via an MPEG video decoder 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing device, and more particularly to a reproducing device corresponding to a video CD or the like capable of reproducing compressed image / audio data.

[0002]

2. Description of the Related Art Various so-called ROM type disc media such as CD-DA and video CD have been widely used. CD-DA records digital audio data so that you can enjoy music with high sound quality.
A CD-G in which still image data is also recorded in subcode data is also known as a type of -DA. Further, as a kind of so-called CD-ROM, a video CD in which moving image data is recorded together with digital audio data has been developed. In such a video CD, the video data and audio data are recorded as compressed data. Further, in various reproducing apparatuses capable of displaying images, such as reproducing apparatuses corresponding to the above-mentioned video CDs and CD-Gs, a title is displayed in a predetermined form as an initial display when the apparatus is turned on. It is known to display a so-called initial image. Further, there is known a device which can output a so-called test image or test voice, such as a color bar signal or a sine wave voice signal, for operation check at the time of manufacturing.

[0003]

By the way, in order to display the initial image and the test image as described above, for example, a graphic processor is provided, and an image is created by the image creation control and displayed. Is being done. If it is a test voice, sine waveform data is stored in a memory and read out when necessary. However, in the case of the above-mentioned configuration, in order to display the initial image and the test image, it becomes necessary to add a circuit section by dedicated hardware, which enlarges the circuit scale and considerably increases the cost. I have a problem. In particular, since the image data is enormous, when the image is complicated, a memory having a very large storage capacity is required to create the image, which is a heavy burden.

[0004]

In consideration of such problems, the present invention outputs a test image, an initial image, a test voice, etc. at low cost without adding a dedicated circuit section. The purpose is to obtain a playback device capable of

Therefore, in a reproducing apparatus capable of performing video output and audio output, including a decoding processing unit for decoding the compressed video data and audio data read from the disk-shaped recording medium, A data holding unit adapted to hold at least the compressed image data and audio data for a test,
The compressed video data or audio data held in the data holding unit is transferred to the decoding processing unit to be subjected to decoding processing, and a control unit capable of outputting as video or audio is provided to constitute a reproducing apparatus. I decided.

[0006]

According to the above construction, in a reproducing apparatus capable of decoding compressed video / audio data and outputting video / audio, it is possible to control data such as already compressed initial image and test image / audio. It can be stored in advance in the internal ROM etc. and read out this data when necessary and output it through the decoding processing unit. This makes it possible to create test images, initial images, etc. It is possible to reduce hardware such as a dedicated circuit and a memory for generating voice. That is, the reproducing circuit system of the disc-shaped recording medium can be shared.

[0007]

EXAMPLE A video CD and a C will be described below as examples of the present invention.
A reproducing apparatus capable of reproducing video / audio for D-DA (digital audio CD and CD-G) will be described. First, the data structure of the video CD will be described.

The video CD standard is an application of the MPEG system standardized as a high-efficiency encoding technique, and is capable of reproducing a moving image and sound for 60 minutes or more from a CD-ROM disc. This makes it useful as household software for music, movies, karaoke, and the like, and can also be combined with still images to support educational software, electronic publishing software, game software, and the like. In this video CD, M for moving image data
In addition to data compression by the PEG method, this moving image data is multiplexed with compressed audio data and recorded. Further, management data necessary for reproduction is recorded in a predetermined area. FIG. 5 shows a data format of the video CD (XA specification).

As the recording format of the image and audio, as shown in FIG. 5, 1.152 Mbit /
64 Kbit / sec to 384 Kbit / sec are allocated to seconds and audio data. The pixel size of video data (moving image) is 352 × 240 pixels for NTSC signal (29.97Hz) and film (23.976Hz) and 352 × 288 pixels for PAL signal (25Hz), that is, as shown in FIG. Become. In the case of NTSC, the number of pixels of a still image is 352 × 240 pixels at the standard level and 704 × 48 at the high definition level.
It is set to 0 pixels, and in the case of PAL, standard level 352 × 28
8 pixels, 704 x 576 pixels at high definition level

Video data (moving image) according to the MPEG system
The compression encoding of is performed as follows. If the video signal before compression is the NTSC system, the case of this NTSC system is 1
It is composed of video signals of 30 frames per second. MP
In the EG method, each video signal (1 frame) is divided into blocks in the plane direction (horizontal 22 block division, vertical 15 block division, 330 block), data of each block is DCT converted, and the number of bits is further increased. Requantization is performed to reduce the number (high frequency components are set to 0). Then, the blocks are rearranged in a zigzag manner from the block at the upper left of the screen of one frame, and run length coding is performed to further compress the number of bits.

Each frame of the video signal thus compressed is very similar to the video information in the frames preceding and succeeding in time, and this information is used to further compress the information. , Three types of video data with different compression levels (one frame of video data) are provided. These are I picture (Intra Picture), P picture (Predicated Picture), and B picture (Bidirecti).
onari Picture).

Then, for each of the 30 frames per second, generally, I picture, P picture and B picture are arranged as shown in FIG. 6 (a). For example, in this case, frames at 15-frame intervals are I pictures I ₁ and I _2, and eight P pictures P ₁
˜P ₈ and 20 B pictures B _{1 to} B ₂₀ are arranged as shown. The section from a certain I-picture to the frame before the next I-picture is GOP (Grou
p of Picture).

The I picture is the normal image data encoded by the DCT conversion as described above. As shown in FIG. 6B, the P picture is generated by coding the nearest I picture or P picture using motion compensation. For example, P picture P ₁ is generated using I picture I ₁ , and P picture P ₂ is generated using P picture P ₁ . Therefore, the P picture is more compressed than the I picture. Since the I-picture and the P-picture are sequentially generated, if an error occurs, the error propagates.

The B picture is generated by using both past and future I pictures or P pictures as shown in FIG. 6 (c). For example, B pictures B ₁ and B ₂ are generated using I picture I ₁ and P picture P ₁ , and B pictures B ₃ and B ₄ are generated using P picture P ₁ and P picture P ₂ . The B picture is the most compressed data. Further, since it does not serve as a data generation reference, no error is propagated.

According to the MPEG algorithm, it is allowed to select the position and synchronization of the I picture, and this selection is decided in consideration of the degree of random access and scene cut. For example, if importance is attached to random access, FIG.
As shown in (a), at least two I-pictures are required for one second. Furthermore, the frequency of P pictures and B pictures can also be selected, and this is set according to the memory capacity of the encoding means.

The encoding means in the MPEG system rearranges and outputs the video data stream so that the efficiency of the decoder is improved.
For example, in the case of FIG. 6A, the frame order to be displayed (decoder output order) is the same as the frame number shown in the lower part of FIG. 6A, but the B picture is recombined by the decoder. A P picture that becomes a reference earlier is needed. For this reason, on the encoder side, the frame order of FIG. 6D is rearranged as shown in FIG. 6E, and this is transmitted as a video data stream.

The MPEG audio data format supports a wide range of coding rates from 32 kbit / sec to 448 Kbit / sec. However, in consideration of easy software production and high sound quality, 224Kbi for the video tracks after Track 2
T / sec. The sampling frequency is 4 as in CD-DA.
It is 4.1 KHz.

Further, in addition to video data and audio data, management data for controlling various reproduction operations thereof are recorded on the video CD. That is, CD-
Similar to DA, TOC and subcode are recorded to indicate the number of tracks, start position (absolute time) of each track, and the like. In addition, track 1 is a video CD in the video CD.
Used as a data track, various management information is recorded.

Next, as a track structure, for example, a data structure of a track in which video data and audio data, which are unit data of one piece of music, is recorded, is shown in FIG.
It becomes like (a). Assuming to search by track number such as CD-DA, 15 is added at the beginning of one track.
A pause margin of 0 sector is set. Further, 15 sectors following the pause margin are used as a front margin, and the last 15 sectors of the track are used as a rear margin, which are empty data areas.

M between the front margin and the rear margin
It is a PEG data area. In the MPEG data area,
As shown in FIG. 8B, the sectors V, which are the video data, and the sectors A, which are the audio data, are time-division multiplexed and recorded by interleaving so that they are arranged at an average ratio of 6: 1. It will be.

As described above, a video CD on which video data and audio data are recorded can be reproduced, and still images are recorded using subcode data in the CD-DA or CD-DA system in which only audio data is recorded. FIG. 1 shows a block diagram of a reproducing apparatus of this embodiment capable of reproducing a CD-G recorded with.

In FIG. 1, reference numeral 30 indicates a disk. The disc 30 is a video CD, a CD-DA, or a CD-G.
Can be loaded. The loaded disk 30 is chucked so as to be rotationally driven by the spindle motor 33. The disk 30 is irradiated with laser light by the optical head 34 without being rotated by the spindle motor 33, and information is read by the reflected light.

The optical head 34 is equipped with a laser diode as a laser output means, an optical system including a deflecting beam splitter and an objective lens, and a detector for detecting reflected light. The objective lens 34a is a two-axis mechanism 3
It is held by 4b so as to be displaceable in the radial direction of the disc and in the direction in which it comes in and out of contact with the disc. Reference numeral 35 denotes a sled mechanism that drives the optical head 34 in the disk radial direction.

The information detected from the disc by the optical head 34 by the reproducing operation is supplied to the RF amplifier 36. The RF amplifier 36 extracts a reproduction RF signal, a tracking error signal, a focus error signal, etc., by processing the supplied information. And the extracted reproduction R
The F signal is supplied to the decoder unit 38, where EFM demodulation and error correction are performed. In addition, P and Q channel subcode data are extracted and supplied to the system controller 53.

Further, the tracking error signal and the focus error signal are supplied to the servo circuit 37. The servo circuit 37 supplies the supplied tracking error signal and focus error signal, the track jump command, the seek command from the system controller 53, and the spindle motor 33.
Various servo drive signals are generated based on the rotational speed detection information of the above, and the biaxial mechanism 34b and the sled mechanism 35 are controlled to perform focus and tracking control, and the spindle motor 33 is controlled to a constant linear velocity (CLV).

Reference numeral 39 is a CD-ROM decoder. The disc being played is a so-called CD-ROM such as a video CD.
, The CD-ROM decoder 39 performs a decoding process according to the CD-ROM format. Of the signals decoded by the CD-ROM decoder 39, the management information necessary for the reproducing operation, that is, various disc information recorded by using the track 1 in the video CD is the system controller 53.
It is taken into the RAM 53a.

The audio data decoded by the CD-ROM decoder 39 is supplied to the MPEG audio decoder 40. The MPEG audio decoder 40 performs decoding and outputs a decoded audio signal at a predetermined timing while using the audio RAM 41. Further, the video data decoded by the CD-ROM decoder 39 is the MPEG video decoder 4
2 is supplied. The MPEG video decoder 42 uses the video RAM 41 to perform decoding and decode video signal output (RGB output) at a predetermined timing.

Reference numeral 44 is a switch unit which can be switched according to the type of the disc to be reproduced. When the disc being played back is a CD-DA, a digital audio signal is obtained by the decoder unit 38 performing a decoding process such as EFM demodulation and CIRC as the playback signal.
During CD-DA reproduction, the system controller 53 connects the switch unit 44 to t ₁ terminal. Therefore, the digital audio signal from the decoder unit 38 is converted into an analog audio signal by the D / A converter 45, and is output from the audio output terminal 46 to an external device such as an amplifier circuit or an amplifier in the subsequent stage.

When the disc being reproduced is a video CD, audio data is obtained from the MPEG audio decoder 40. During reproduction of the video CD, the system controller 53 connects the switch section 44 to the t ₂ terminal. Therefore, the digital audio signal from the MPEG audio decoder 40 is converted into an analog audio signal by the D / A converter 45, and the audio output terminal 4
6 is output to an external device such as an amplifier circuit or an amplifier in the subsequent stage.

When reproducing a video CD, RGB video data is obtained as an output of the MPEG video decoder 42. This RGB image data is converted into RGB by the D / A converter 47.
It is an analog signal. Then, the RGB signals are supplied to the RGB / NTSC encoder 48, and the RGB signals are converted into NTSC composite video signals. And the switch section 49
Is supplied to the t ₂ terminal of the.

During reproduction of the video CD, the system controller 53 connects the switch section 49 to the t ₂ terminal, so that the NTSC composite video signal is OS.
The video signal is supplied from the video output terminal 51 to the monitor device or the like via the D processing unit 50, and the video output is executed. By the operation of the OSD processing unit 50 based on the instruction from the system controller 53, it is possible to perform a predetermined superimposed display on the output video.

By the way, the disc to be reproduced is a CD-D.
If it is A and is CD-G, still image data is read from the R to W channels of the subcode. This still image data is stored in the CD-G decoder 52.
To be decoded and output as an NTSC composite video signal (still image). CD-DA during reproduction, the switch section 49 is connected to t ₁ terminal, thus the video signal reproduced from the CD-G is the OSD processing unit 50
Is supplied to the monitor device or the like from the video output terminal 51 via the, and video output is executed. Also in this case, the OSD processing unit 5
With 0, a predetermined superimposed display can be performed on the output video.

Reference numeral 54 denotes an operation input unit provided for user operation, including various operation keys such as a reproduction key, a stop key, an FF / REW key, various mode setting keys, etc., provided on the housing of the reproduction apparatus, and an infrared reception unit ( And remote commander)
Corresponds to this. It should be noted that in the present embodiment, the operation unit 54 can be operated by a key operation to enter a test mode for outputting a test image and a test sound, which will be described later. Reference numeral 55 is a display unit including a liquid crystal panel or the like. When the reproducing operation is performed from the disc 30, the management information recorded on the disc 30, that is, T
The OC and subcode data are read out and supplied to the system controller 53.
Displays the track number and the reproduction time on the display section 55 according to the management information.

Reference numeral 56, which is provided so as to be connected to the system controller 53, is a ROM and stores, for example, program data necessary for controlling each functional circuit section of the reproducing apparatus. In the case of the present embodiment, the test image, the initial image, the test sound compressed by the MPEG method, and the data of the message image displayed at the time of CD-DA reproduction described later are respectively stored in predetermined areas of the ROM 56. It is supposed to keep it.

In the reproducing apparatus of the present embodiment having the above-described structure, for example, when the test mode is set at the time of manufacture or adjustment, the MPEG compressed test image and test audio data in the ROM 56 are transferred to the MPEG video decoder 4.
2. By transferring each to the MPEG audio decoder 40, it is possible to display a test image and output a test sound. If the user normally uses the ROM 56 when the power is turned on.
An initial image can be displayed by transferring the initial image data by MPEG compression stored in the MPEG video decoder 42 to a decoding process. Further, a message image can be displayed in the same manner when reproducing the CD-DA.

Therefore, first, the operation of outputting the test image and the test sound will be described with reference to the flowchart of FIG. The form of the test image and the test voice is not particularly limited, but in the present embodiment, for example, a color bar image is displayed as the test image, and the test voice is a sine wave audio signal of a predetermined frequency. Will be output. Therefore, the video signal of the color bar image and the audio signal of the sine wave are stored in the ROM 56 as the test data, respectively, as compressed data by the MPEG system.

In this routine, it is first determined in step F101 whether or not the test mode is set. If it is determined that the test mode is not set, the process directly returns to the original routine. On the other hand, for example, the operation unit 54
When it is determined that the test mode is selected by operating the key of the key or the operation of the DIP switch provided in the device, the system controller 53 causes the step F1
Go to 02. In this step F102, in order to avoid overflow of the video RAM 43 used for processing data at the time of video decoding processing, this video RAM
It is determined whether there is a certain amount of empty area in 43.
If the video RAM 43 does not have a certain amount of free space, the process of step F102 is repeated until the audio RAM 41 has a certain amount of free space. On the other hand, if it is determined that there is a fixed amount of free space, the process proceeds to step F103, where a fixed amount of compressed data of the test image is read from the ROM 56, transferred to the MPEG video decoder 43, and the process proceeds to step F104.

In the next step F104, the transferred test image data is MPEG-encoded using the video RAM 43.
The decoding process is executed by the video decoder 42,
The control is performed so that the test image is displayed. In this case, after the test image data decoded by the MPEG video decoder 42 is converted into an analog NTSC RGB signal through the D / A converter 47 and the NTSC encoder, the switch unit is further switched to the t ₂ terminal side. 49
Also, it is output as a color bar video signal from the output terminal 51 via the OSD processing unit.

In the next step F105, the MP of the test voice is
An audio RAM used for processing data during audio decoding when transferring EG compressed data from the ROM 56 to the MPEG audio decoder 40.
In order to avoid the overflow of 41, it is determined whether or not a certain amount of empty area currently exists in the audio RAM 41. If there is no fixed amount of space in the audio RAM 41, the process of step F105 is repeated. On the other hand, if it is determined that a certain amount of vacant space is obtained, the process proceeds to step F106, where a certain amount of compressed test voice data is transferred to the MPEG audio decoder 40, and the step is performed.
Go to F107. In step F107, the MPEG audio decoder 40 uses the audio RAM 41 to perform the test voice decoding process to obtain demodulated sine waveform data. Then, the demodulated data is converted into an analog sine wave audio signal by the D / A converter 45 via the switch section 44 switched to the t ₂ terminal and supplied to the output terminal 46. As a result, a sine wave test voice is output.

In the next step F108, it is determined whether or not the test mode is currently continued, and if it is in the test mode, the system controller 53 continues to output the color bar image and the sine wave sound. There is. That is, during the test mode period, the test image and the test sound are repeatedly output continuously. On the other hand, in step F108, if the test mode is canceled by the key operation of the operation unit 54 or the switching of the DIP switch, the process proceeds to step F109.
In order to stop the test image display and the test audio output, for example, the MPEG video decoder 42, the video R
Control is performed such that the test image / voice processing data is erased from the AM 43, the MPEG audio decoder 40, and the video RAM 41, respectively. And the next step
MPEG video decoder 42 and MPEG in F209
Initialize various control values given to the audio decoder 40 (note that the contents of the video RAM 43 and the audio RAM 41 are also initialized at this time)
To return to the original routine.

Next, the display operation of the initial image displayed when the power is turned on will be described with reference to the flowchart of FIG. By the way, the specific design of the initial image displayed here can of course be set arbitrarily,
The display form is not limited to the fade-in and the like described below, and various types are conceivable. However, the test image is designed to look good as the initial image, and the test image data is used as the initial image data. It can also be configured to divert and display.
By doing so, at least one type of image data is required to display the test image and the initial image, so that the amount of data to be stored in the ROM 56 can be further reduced.

In this routine, a user operates a power key provided on the operation unit 54, a power switch (not shown) provided on the reproducing apparatus main body, or the like.
Information that the playback device was turned on is available (F201)
Then, the system controller 53 proceeds to step F202 to first initialize the MPEG video decoder 40 and the MPEG audio decoder 42. In the initialization process, the contents of the video RAM 43 and the audio RAM 41 are also initialized.

Next, the system controller 53 proceeds to step F203, reads the data of the initial image compressed by the MOEG method from the ROM 56, transfers this data to the MPEG video decoder 42, and then proceeds to step F204. Then, the MPEG video decoder 42 performs control so that decoding processing of the transferred data is executed. If the same initial image and test image are used as described above, the compressed data of the test image is stored in the ROM in step F203.
56 is read. Then, the system controller 53 next proceeds to step F205, and it is required that the image data demodulated by the MPEG video decoder 42 is finally displayed in a fade-in state such that the initial image gradually appears. Control the functional circuit part of. After this, the system controller 53 returns to the original routine.

Next, an operation for displaying a message image indicating that the CD-DA is being reproduced at the time of reproducing the CD-DA will be described with reference to the flowchart of FIG. . For example, when a CD-DA (excluding CD-G in this case) is reproduced by the reproducing apparatus of the present embodiment, only the sound is output and the image is not displayed, but such a message image is displayed. If it is displayed, the user can immediately understand that the CD-DA is currently playing, and if the message image is an interesting one such as a landscape image or a design image, the so-called It can also serve as a background picture.

In this routine, first, step F3
As indicated by 01, it is determined whether or not the CD-DA is being reproduced. If it is determined that the CD-DA is not being reproduced, the original routine is returned to. . On the other hand, if it is determined here that the CD-DA is reproduced by the user operating the operation unit 54 or the like, the process proceeds to step F302. In this step F302, the compressed message image data is read from the ROM 56 and transferred to the MPEG video decoder 42, and in the next step F303, the MPEG video decoder 42 is caused to demodulate the compressed data of the message image,
Go to step F304. In this step F304, control is executed so that the message image is actually displayed by the demodulated message image data, and the step F3
Go to 05. In this case as well, the display of the message image is performed by fading in, and the operation for this is the same as that described in the initial display. In step F305, CD-
It is discriminated whether or not the DA reproduction is completed.
When the reproduction of the DA is continued, the processing of this step is repeated to wait for the completion of the reproduction of the CD-DA. Then, the reproduction of the CD-DA is performed to the end, or the C operation is performed by the user's stop operation.
If it is determined that the D-DA reproduction is completed, step F3
After proceeding to 06 and executing the control for stopping the display of the message image, the routine is returned to the original routine.

Although the present embodiment has been described as being compatible with the MPEG system, this is an example, and it is naturally possible to apply the present invention to other various image and audio data compression systems. is there. Further, in the embodiment, the configuration in which the test image, the test voice, the initial image and the message image can be output has been described.However, in the case where an erroneous operation is made, an appropriate operation guide is displayed or voice support is provided. It is also possible to give a function such as to be performed.

[0047]

As described above, according to the present invention, data such as a test image, a test voice, an initial image, a message image, etc., which has been subjected to the same compression processing as the data read from the disk to the ROM in the system controller. Is stored and held, and when necessary, these data are read out and subjected to decoding processing by the disk reproduction circuit system and reproduced, so that the circuit section conventionally required for the generation of these image signals and the generation of audio signals. There is an effect that it is possible to obtain a reproducing device capable of displaying the above various images at low cost without providing the above.

[Brief description of drawings]

FIG. 1 is a block diagram of a playback device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing operation for outputting a test image / voice in the embodiment.

FIG. 3 is a flowchart showing a processing operation for initial image output in the embodiment.

FIG. 4 is a flowchart showing a processing operation for outputting a message image in the embodiment.

FIG. 5 is an explanatory diagram of a CD-ROM format.

FIG. 6 is an explanatory diagram of video data of a video CD.

FIG. 7 is an explanatory diagram of an image size of a video CD.

FIG. 8 is an explanatory diagram of a track structure of a video CD.

[Explanation of symbols]

 30 disk 34 optical head 36 RF amplifier 38 decoder section 39 CD-ROM decoder 40 MPEG audio decoder 41 audio RAM 42 MPEG video decoder 43 video RAM 48 RPG / NTSC encoder 50 OSD processing section 51 video output terminal 53 system controller 56 ROM

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 22, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Each frame of the video signal thus compressed is very similar to the video information in the frames preceding and succeeding in time, and this information is used to further compress the information. , Three types of video data with different compression levels (one frame of video data) are provided. These are I picture (Intra Picture), P picture (Predicted Picture) , and B picture (Bidirecti ) .
onally Predicted Picture) .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

Also, the encoding means in the MPEG system rearranges and outputs the video data stream so that the efficiency of the decoder is improved . For example, in the case of FIG. 6A, the frame order to be displayed (decoder output order) is the same as the frame number shown in the lower part of FIG. 6A, but the B picture is recombined by the decoder. A P picture that becomes a reference earlier is needed. For this reason, on the encoder side, the frame order of FIG. 6D is rearranged as shown in FIG. 6E, and this is transmitted as a video data stream.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

In FIG. 1, reference numeral 30 indicates a disk. The disc 30 is a video CD, a CD-DA, or a CD-G.
Can be loaded. The loaded disk 30 is chucked so as to be rotationally driven by the spindle motor 33. Then the disc 30, such is rotated by the spindle motor 33 the laser beam is irradiated by al the optical head 34, information is read by the reflected light.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

The audio data decoded by the CD-ROM decoder 39 is supplied to the MPEG audio decoder 40. The MPEG audio decoder 40 performs decoding and outputs a decoded audio signal at a predetermined timing while using the audio RAM 41. Further, the video data decoded by the CD-ROM decoder 39 is the MPEG video decoder 4
2 is supplied. The MPEG video decoder 42 uses the video RAM 43 to perform decoding and decode video signal output (RGB output) at a predetermined timing.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

In this routine, it is first determined in step F101 whether or not the test mode is set. If it is determined that the test mode is not set, the process directly returns to the original routine. On the other hand, for example, the operation unit 54
When it is determined that the test mode is selected by operating the key of the key or the operation of the DIP switch provided in the device, the system controller 53 causes the step F1
Go to 02. In this step F102, in order to avoid overflow of the video RAM 43 used for processing data at the time of video decoding processing, this video RAM
It is determined whether there is a certain amount of empty area in 43.
If there is not a certain amount of free space in the video RAM 43, the process of step F102 is repeated, and the video RA
It waits until a certain amount of free area is obtained in M43 . On the other hand, if it is determined that there is a fixed amount of free space, the flow proceeds to step F103, where a fixed amount of compressed data of the test image is read from the ROM 56, transferred to the MPEG video decoder 42 , and the flow proceeds to step F104.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction content]

[0040] In the next step F108, and a determination is made regarding whether the current test mode is continued, te
Return to step F105 until the strike mode is released
Amount of compressed test audio data to MPEG audio deco
Sine wave sound is output by continuing to transfer
Let the power continue. For video, video decoder
The color bar image is automatically output from 42. On the other hand, in step F108, if the test mode is canceled by the key operation of the operation unit 54 or the switching of the DIP switch, the process proceeds to step F109.
In order to stop the test image display and the test audio output, for example, the MPEG video decoder 42, the video R
Control is performed such that the test image / voice processing data is erased from the AM 43, the MPEG audio decoder 40, and the video RAM 41, respectively. And the next step
MPEG video decoder 42 and MPEG in F110
Initialize various control values given to the audio decoder 40 (note that the contents of the video RAM 43 and the audio RAM 41 are also initialized at this time)
To return to the original routine.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Change

[Correction content]

In this routine, a user operates a power key provided on the operation unit 54, a power switch (not shown) provided on the reproducing apparatus main body, or the like.
Information that the playback device was turned on is available (F201)
Then, the system controller 53 proceeds to step F202 to first initialize the MPEG video decoder 42 and the MPEG audio decoder 40 . In the initialization process, the contents of the video RAM 43 and the audio RAM 41 are also initialized.

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure Amendment 10]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

[Procedure Amendment 11]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (1)

[Claims] 1. A video output and / or audio output can be provided by providing a decoding processing means for performing a decoding process on compressed video data and / or audio data read from a disk-shaped recording medium. In the playback device, at least compressed image data for test and / or
Alternatively, a data holding unit that holds audio data for testing, and compressed video data or audio data held in the data holding unit are transferred to the decoding processing unit to perform decoding processing, A reproducing apparatus provided with control means capable of outputting as video or audio.