JP2008053828A - Image reproduction device and method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reproduction device to make matching of timing among a plurality of processing, and to provide a method thereof. <P>SOLUTION: The image reproduction device includes a signal generation control unit, a first storage unit which stores state information showing the state of the signal generation control unit, and a second storage unit which stores a state transition table wherein state transition of the signal generation control unit is described. The state transition table shows that the signal generation control unit changes from a first state wherein a command is not held to a second state wherein the command is held on receiving the command, and also issues a command to a signal generating unit and changes from the second state to the first state or another state on receiving a second synchronizing signal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image reproducing apparatus and method for reproducing an image.

2. Description of the Related Art An image / sound reproduction device that records and reproduces image / sound on a storage device such as a hard disk or a DVD is used.
In the image / sound reproduction device, in addition to the reproduction of the image / sound from the storage device, a predetermined process such as reproduction of a predetermined image / sound may be performed. These predetermined processes are often executed by a central processing unit (CPU), and include processes executed at a timing different from the reproduction of images and sounds.
A DVD player technology that synchronizes the start time of an audio / visual stream with a graphics controller is disclosed (see Patent Document 1).
JP-A-10-208453

If the timing of image reproduction and these predetermined processes do not match, the user of the image reproduction apparatus may feel uncomfortable.
In view of the above, it is an object of the present invention to provide an image reproducing apparatus and a method thereof that achieve timing matching among a plurality of processes.

  An image reproduction device according to an aspect of the present invention includes a first synchronization signal generation unit that generates a first synchronization signal, and a second synchronization signal that generates a second synchronization signal having a period different from that of the first synchronization signal. A synchronization signal generation unit; an image generation unit that generates image data in synchronization with the second synchronization signal; a signal generation unit that generates a predetermined signal in synchronization with the first synchronization signal; A control unit that issues a command for controlling the generation of a predetermined signal, and a signal generation management unit that manages the command to the signal generation unit, the state of which changes based on the command from the control unit and the first synchronization signal A first storage unit that stores state information indicating a state of the signal generation management unit, and a second storage unit that stores a state transition table describing a state transition of the signal generation management unit. The state transition table receives a command from the control unit. Therefore, the signal generation management unit shifts from the first state in which the command is not held to the second state in which the command is held, and the signal generation management unit receives the second synchronization signal. , Issuing a command to the signal generation unit, indicating a transition from the second state to the first state or another state.

  According to the present invention, it is possible to provide an image reproducing apparatus and a method thereof in which timings are matched among a plurality of processes.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing an image reproduction device 100 according to the first embodiment of the present invention.
The image reproduction apparatus 100 includes a moving image / sound storage unit 110, a video decoder 121, an audio decoder 122, a video component jitter 131, an audio mixer 132, a program information storage unit 141, a state information storage unit 142, a program execution unit 150, and a graphic renderer 161. , A sound effect reproduction management unit 162, a graphic decoder 171, a sound effect decoder 172, a rendering timing generation unit 181, and a program execution timing generation unit 182.

  The moving image / audio storage unit 110 is a storage device such as a hard disk, and stores moving image and audio information as a moving image / audio stream. The moving image / audio stream includes moving image data and audio (audio) data.

The video decoder 121 decodes the moving image data included in the moving image / audio stream output from the moving image / audio storage unit 110 to generate an image signal. The video decoder 121 functions as an image reproduction unit that reproduces an image signal from an image / audio stream.
The audio decoder 122 decodes audio data included in the moving image / audio stream output from the moving image / audio storage unit 110 to generate an audio signal. The audio decoder 122 functions as an audio reproduction unit that reproduces an audio signal from an image / audio stream.

The video compositor 131 synthesizes the image signals output from the video decoder 121 and the graphic decoder 171 and outputs them as a video signal. For example, the image generated by the graphic decoder 171 is superimposed on the image reproduced by the video decoder 121 and displayed.
The audio mixer 132 mixes the audio signals output from the audio decoder 122 and the sound effect decoder 172, and outputs the result as an audio (audio) signal.

The program information storage unit 141 stores programs and program resources.
The program is a program that can instruct graphic drawing and sound effect reproduction, and is executed by the program execution unit 150. That is, the program includes a graphic drawing instruction and a sound effect reproduction instruction (reproduction start instruction, reproduction stop instruction). The program resource is data used when the program is executed, and includes sound effect data.
The state information storage unit 142 stores a state transition table and state information.
The state transition table is a table representing the state transition relationship of the sound effect reproduction management unit 162. The state information is information indicating the state of the sound effect reproduction management unit 162 and is rewritten by the sound effect reproduction management unit 162. Details of the state transition table and the state information will be described later.

  The program execution unit 150 issues drawing instructions and sound effect playback instructions (sound effect playback start instruction and playback stop instruction) described in the program. These instructions are issued based on the timing signal output from the program execution timing generation unit 182.

The program execution unit 150 issues a graphic rendering instruction to the graphic renderer 161 in accordance with the program drawing instruction. The program execution unit 150 functions as a control unit that issues a command for controlling generation of a predetermined signal.
The program execution unit 150 issues a sound effect reproduction start instruction to the sound effect reproduction management unit 162 with sound effect data included in the program resource in accordance with the sound effect reproduction start instruction in the program.
The program execution unit 150 issues a sound effect reproduction stop instruction to the sound effect reproduction management unit 162 in accordance with the sound effect reproduction stop instruction in the program.

  The program execution unit 150 can recognize the reproduction status in the sound effect reproduction management unit 162 based on the reproduction start instruction, reproduction stop instruction issued by itself, and the completion notification from the sound effect reproduction management unit 162. For example, when the program execution unit 150 issues a playback stop instruction or issues a completion notification from the sound effect playback management unit 162 after issuing the playback start instruction, the program execution unit 150 performs sound effect playback management. It is recognized that the unit 162 is in a non-reproducing state. The program execution unit 150 can issue a start instruction to the sound effect reproduction management unit 162 only when this reproduction state is not being reproduced.

  The program execution unit 150 can be configured by either hardware such as a central processing unit (CPU) or software that executes a script. In the latter case, the program and the program resource mean a script and a resource used in the script, respectively.

The graphic renderer 161 renders a graphic (draws an image) in accordance with an instruction from the program execution unit 150 and sends the rendered graphic to the graphic decoder 171. The graphic renderer 161 functions as an image generation unit that generates image data.
Note that the screen drawn by the graphic renderer 161 (and the image output from the graphic decoder) can be positioned as a sub-image with respect to the main image from the video decoder 121. As an example of the sub-image, a menu screen for operating the image reproduction apparatus 100 can be given.

The sound effect reproduction management unit 162 sends a sound effect reproduction instruction (reproduction start instruction, reproduction stop instruction) to the sound effect decoder 172. This issuance is based on the state transition table and state information. In the case of a reproduction start instruction, the sound effect reproduction management unit 162 sends sound effect data to the sound effect decoder 172 together with this instruction. The sound effect reproduction management unit 162 functions as a signal generation management unit that manages commands to the signal generation unit.
Upon receiving the completion notification from the sound effect decoder 172, the sound effect reproduction management unit 162 issues a completion notification to the program execution unit 150.

  The graphic decoder 171 decodes the received graphic data, generates an image signal, and outputs it to the video component jitter 131.

The sound effect decoder 172 decodes the received sound effect data, generates an audio signal, and outputs it to the audio mixer 132. The sound effect decoder 172 functions as a signal generation unit that generates a predetermined signal.
When the sound effect decoder 172 receives the reproduction start instruction from the sound effect reproduction management unit 162, the sound effect decoder 172 immediately outputs the decoded sound effect and the decoded audio signal to the audio mixer 132. When the sound effect decoder 172 decodes the sound effect instructed by the reproduction start instruction from the sound effect reproduction management unit 162 to the end, the sound effect decoder 172 immediately issues a sound effect reproduction completion notification to the sound effect reproduction management unit 162.
When the sound effect decoder 172 receives an instruction to stop the sound effect reproduction from the sound effect reproduction management unit 162, if it is being decoded, the sound effect decoder 172 immediately stops the decoding and notifies the sound effect reproduction management unit 162 of the completion of the sound effect reproduction. Issue. If the decoding is not in progress when the stop instruction is received, the sound effect decoder 172 does not perform any special processing.

The rendering timing generation unit 181 generates and outputs a synchronization signal (timing signal) serving as a reference for processing timing in the video decoder 121, the audio decoder 122, and the graphic renderer 161.
The program execution timing generation unit 182 generates and outputs a synchronization signal (timing signal) that serves as a reference for processing timing in the program execution unit 150.

  The rendering timing generation unit 181 and the program execution timing generation unit 182 are different from a clock for controlling hardware. That is, the rendering timing generation unit 181 and the program execution timing generation unit 182 give the start timing of the rendering process and the program execution start time, respectively.

2 and 3 are schematic diagrams illustrating the state transition relationship represented by the state transition table.
FIG. 2 is a state transition diagram expressing the state transition relationship of the sound effect reproduction management unit 162. The transition transition relation of state 0 to state 5 included in the sound effect reproduction management unit 162 is expressed.
FIG. 3 is a table showing each state of FIG. Each of the states 0 to 5 represents the relationship between the reproduction status and the reproduction instruction hold status (start instruction hold status, stop instruction hold status).

  The reproduction status represents whether or not the image reproduction apparatus 100 is in a reproduction state during execution of the program (either “reproducing” or “not reproducing”). This reproduction situation is a reproduction situation seen from the program, and the reproduction is not necessarily actually performed. That is, the program is executed based on the reproduction status, and the presence or absence of actual reproduction does not directly affect the execution of the program.

The reason why the execution of the program is separated from the actual presence / absence of the reproduction is that the execution timing of the program is different from the reproduction timing of the moving image / sound. The execution of the program is controlled by a timing signal from the program execution timing generation unit 182. On the other hand, reproduction / rendering of moving images / sounds is controlled by a timing signal from the rendering timing generation unit 181.
The sound effect reproduction management unit 162 functions as a kind of buffer in order to absorb the timing difference between the rendering timing generation unit 181 and the program execution timing generation unit 182 and to execute the program promptly.

The start instruction hold status indicates whether or not the playback start instruction received by the sound effect playback management unit 162 is held (either “pending” or “no hold”).
In the case of “pending”, execution of the reproduction start instruction received by the sound effect reproduction management unit 162 is suspended. That is, the sound effect reproduction management unit 162 has received a reproduction start instruction, but has not issued a reproduction start instruction to the sound effect decoder 172. In this state, when the sound effect reproduction management unit 162 receives the timing signal from the rendering timing generation unit 181, it issues a reproduction start instruction to the sound effect decoder 172.
In the case of “no hold”, the sound effect reproduction management unit 162 has not received a reproduction start instruction, or the received reproduction start instruction has been executed. Even if the sound effect reproduction management unit 162 receives the timing signal from the rendering timing generation unit 181 in this state, a reproduction start instruction is not issued to the sound effect decoder 172.

The stop instruction hold status indicates whether or not the stop instruction received by the sound effect reproduction management unit 162 is being held (“on hold” or “no hold”).
In the case of “pending”, the execution of the playback stop instruction received by the sound effect playback management unit 162 is put on hold. That is, the sound effect reproduction management unit 162 receives a reproduction stop instruction, but does not issue a reproduction stop instruction to the sound effect decoder 172. In this state, when the sound effect reproduction management unit 162 receives the timing signal from the rendering timing generation unit 181, it issues a reproduction stop instruction to the sound effect decoder 172.
In the case of “no hold”, the sound effect reproduction management unit 162 has not received a reproduction stop instruction or the received reproduction start instruction has been executed. Even if the sound effect reproduction management unit 162 receives the timing signal from the rendering timing generation unit 181 in this state, the reproduction stop instruction is not issued to the sound effect decoder 172.

The sound effect reproduction management unit 162 receives a sound effect reproduction start instruction and stop instruction from the program execution unit 150, a sound effect reproduction completion notification from the sound effect decoder 172, and a timing notification from the rendering timing generation unit 181. Transition.
When the state transitions, the sound effect reproduction management unit 162 may issue a start notification and a stop notification to the sound effect decoder 172 and a completion notification to the program execution unit 150. The sound effect reproduction management unit 162 issues a sound effect reproduction start instruction and a stop instruction using the timing signal from the rendering timing generation unit 181 as a trigger.

When a start instruction is issued from the program execution unit 150, the sound effect reproduction management unit 162 holds the start instruction. When the timing signal from the rendering timing generation unit 181 is received in a situation where the start instruction is pending, the sound effect reproduction management unit 162 issues a start instruction to the sound effect decoder 172.
When a stop instruction is issued from the program execution unit 150, the sound effect reproduction management unit 162 holds the stop instruction. When the timing signal from the rendering timing generation unit 181 is received in a situation where the stop instruction is pending, the sound effect reproduction management unit 162 issues a stop instruction to the sound effect decoder 172.
When receiving the completion notification from the sound effect decoder 172, the sound effect reproduction management unit 162 issues a completion notification to the program execution unit 150.

Hereinafter, the state and state transition relationship of the sound effect reproduction management unit 162 will be described in detail.
(1) State 0
In the initial state of the image playback device 100, the sound effect playback management unit 162 is in the state 0. That is, the state 0 is an initial state of the sound effect reproduction management unit 162.
In the state 0, the reproduction status is “not reproducing”, and both the start instruction hold status and the stop instruction hold status are “no hold”.
When a start instruction is issued from the program execution unit 150 in the state 0, the sound effect reproduction management unit 162 shifts to the state 1.

(2) State 1
In state 1, the reproduction status is “reproducing”, the start instruction hold status is “pending”, and the stop instruction hold status is “no hold”. That is, when the sound effect reproduction management unit 162 receives the start instruction, the reproduction state becomes “being reproduced”. However, since the timing signal is not received, the start instruction hold status is “pending”.
When a stop instruction is issued from the program execution unit 150 in the state 1, the sound effect reproduction management unit 162 discards the start instruction and shifts to the state 0.
When the timing notification is issued from the rendering timing generation unit 181 in the state 1 (when the timing signal is output), the sound effect reproduction management unit 162 issues a start instruction and shifts to the state 2.

(3) State 2
In state 2, the reproduction status is “reproducing”, and both the start instruction hold status and the stop instruction hold status are “no hold”. That is, when the sound effect reproduction management unit 162 issues a start instruction to the sound effect decoder 172, the start instruction hold status shifts to “no hold”.
When the stop instruction is issued from the program execution unit 150 in the state 2, the sound effect reproduction management unit 162 shifts to the state 3.
When a completion notification is issued from the sound effect decoder 172 in the state 2, the sound effect reproduction management unit 162 issues a completion notification and shifts to the state 0.

(4) State 3
In state 3, the reproduction status is “not reproducing”, the start instruction hold status is “no hold”, and the stop instruction hold status is “pending”.
When the start instruction is issued from the program execution unit 150 in the state 3, the sound effect reproduction management unit 162 shifts to the state 4.
When the timing notification is issued from the rendering timing generation unit 181 in the state 3, the sound effect reproduction management unit 162 issues a stop instruction and shifts to the state 5.
When a completion notification is issued from the sound effect decoder 172 in the state 3, the sound effect reproduction management unit 162 issues a completion notification and shifts to the state 0.

(5) State 4
In state 4, the reproduction status is “reproducing”, and both the start instruction hold status and the stop instruction hold status are “pending”.
When the stop instruction is issued from the program execution unit 150 in the state 4, the sound effect reproduction management unit 162 discards the start instruction and shifts to the state 3.
When the timing notification is issued from the rendering timing generation unit 181 in the state 4, the sound effect reproduction management unit 162 issues a stop instruction and shifts to the state 6.
When the completion notification is issued from the sound effect decoder 172 in the state 4, the sound effect reproduction management unit 162 issues the completion notification and shifts to the state 1.

(6) State 5
In state 5, the reproduction status is “Non-reproduction”, and both the start instruction hold status and the stop instruction hold status are “no hold”.
When the start instruction is issued from the program execution unit 150 in the state 5, the sound effect reproduction management unit 162 shifts to the state 6.
When a completion notification is issued from the sound effect decoder 172 in the state 5, the sound effect reproduction management unit 162 issues a completion notification and shifts to the state 0.

(7) State 6
In state 6, the reproduction status is “reproducing”, the start instruction hold status is “pending”, and the stop instruction hold status is “no hold”.
When a stop instruction is issued from the program execution unit 150 in the state 6, the sound effect reproduction management unit 162 discards the start instruction and shifts to the state 5.
When a completion notification is issued from the sound effect decoder 172 in the state 6, the sound effect reproduction management unit 162 issues a completion notification and shifts to the state 1.

In the present embodiment, a sound effect reproduction management unit 162 is arranged between the program execution unit 150 and the sound effect decoder 172 to synchronize the timing of graphic drawing and sound effect reproduction.
The program is usually written on the assumption that the rendering (graphic drawing) by the graphic renderer 161 and the reproduction of the sound effect by the sound effect decoder 172 are synchronized. If the reproduction of the sound effect by the sound effect decoder 172 is started at the timing instructed by the program execution unit 150, the sound effect is output prior to the graphic update, which is contrary to expectations. The sound effect reproduction management unit 162 can synchronize the graphic update and the output of the sound effect.

(Second Embodiment)
FIG. 4 is a block diagram showing an image reproduction apparatus 200 according to the second embodiment of the present invention.
The image reproduction apparatus 200 includes a moving image / audio storage unit 110, a video decoder 121, an audio decoder 122, a video component jitter 131, an audio mixer 132, a program information storage unit 241, a status information storage unit 242, a program execution unit 250, and a graphic renderer 161. , A mixer setting management unit 291, a mixer setting unit 292, a rendering timing generation unit 181, and a program execution timing generation unit 182.

The mixer setting unit 292 generates a signal for setting the audio mixer 232. The mixer setting unit 292 functions as a signal generation unit that generates a predetermined signal. The setting of the audio mixer 232 is, for example, a volume setting. When the audio mixer 232 has a plurality of channels, the volume of each channel can be set. That is, the audio mixer 232 functions as an audio adjustment unit that adjusts the audio signal.
The mixer setting management unit 291 performs state transition based on a mixer setting change instruction from the program execution unit 250 and a timing signal from the rendering timing generation unit 181. The mixer setting management unit 291 issues a change instruction using the timing signal from the rendering timing generation unit 181 as a trigger.

5 and 6 are schematic diagrams illustrating the state transition relationship represented by the state transition table 243.
FIG. 5 is a state transition diagram expressing the state transition relationship of the mixer setting management unit 291. The transition relationship of the state 0 to the state 1 that the mixer setting management unit 291 has is expressed.
FIG. 6 is a table showing each state of FIG. The relationship between each of state 0 to state 1 and the change instruction hold status is shown.
When the setting change instruction is issued from the program execution unit 250, the mixer setting management unit 291 transitions from the state 0 where the change instruction is not held to the state 1 where the change instruction is held.
When the timing notification is issued from the rendering timing generation unit 181, the mixer setting management unit 291 issues a change instruction, and the state transitions from state 1 in which the change instruction is held to state 0 in which the change instruction is not held.

  An instruction from the program execution unit 250 to the graphic renderer 161 and the mixer setting unit 292 is issued in synchronization with a timing signal from the program execution timing generation unit 182. At this time, the setting of the audio mixer 232 by the mixer setting unit 292 is immediately executed in synchronization with the timing signal from the program execution timing generation unit 182. On the other hand, graphic drawing by the graphic renderer 161 is executed in synchronization with a timing signal from the rendering timing generation unit 181.

  In the present embodiment, based on the state transition table stored in the state information storage unit 242, the mixer setting management unit 291 holds the setting change command to the audio mixer 232 and synchronizes with the timing signal from the rendering timing generation unit 181. Then, the audio mixer 232 is set (graphic update timing). As a result, graphic drawing by the graphic renderer 161 and setting change by the audio mixer 232 are executed in synchronization.

(Third embodiment)
FIG. 7 is a block diagram showing an image reproduction device 300 according to the third embodiment of the present invention.
The image reproduction apparatus 300 includes a moving image / audio storage unit 110, a video decoder 121, an audio decoder 122, a video component jitter 131, a program information storage unit 341, a status information storage unit 342, a program execution unit 350, a graphic renderer 161, and a graphic decoder 171. , A rendering timing generation unit 181, a program execution timing generation unit 182, a display effect setting management unit 391, and a display effect setting unit 392.

The display effect setting unit 392 generates a signal for setting the video decoder 121. The display effect setting unit 392 functions as a signal generation unit that generates a predetermined signal. The setting of the video decoder 121 is, for example, the setting of the position of the screen (sub-screen) drawn by the graphic renderer 161, the background color, and the transmittance.
The display effect setting management unit 391 performs state transition according to the display effect setting change instruction from the program execution unit 350 and the timing signal from the rendering timing generation unit 181. The display effect setting management unit 391 issues a change instruction using the timing signal from the rendering timing generation unit 181 as a trigger.

When the setting change instruction is issued from the program execution unit 350, the display effect setting management unit 391 transitions from the state 0 where the change instruction is not held to the state 1 where the change instruction is held.
When the timing notification is issued from the rendering timing generation unit 181, the display effect setting management unit 391 issues a change instruction, and the state transitions from state 1 where the change instruction is held to state 0 where the change instruction is not held.
Since the state transition relationship in the display effect setting management unit 391 is substantially the same as in FIGS. 5 and 6 in the second embodiment, the illustration is omitted.

  An instruction from the program execution unit 350 to the graphic renderer 161 and the display effect setting unit 392 is issued in synchronization with a timing signal from the program execution timing generation unit 182. At this time, the setting of the video decoder 121 by the display effect setting unit 392 is immediately executed in synchronization with the timing signal from the program execution timing generation unit 182. On the other hand, graphic drawing by the graphic renderer 161 is executed in synchronization with a timing signal from the rendering timing generation unit 181.

  In the present embodiment, based on the state transition table stored in the state information storage unit 342, the display effect setting management unit 391 holds the change of the display effect setting and synchronizes with the timing signal from the rendering timing generation unit 181. (Graphic update timing), the video decoder 121 is set. As a result, graphic drawing by the graphic renderer 161 and setting change by the video decoder 121 are executed in synchronization.

(Other embodiments)
Embodiments of the present invention are not limited to the above-described embodiments, and can be expanded and modified. The expanded and modified embodiments are also included in the technical scope of the present invention.
For example, in the above embodiment, (1) start / stop of sound effect generation, (2) change in mixer setting, and (3) change in display effect setting are shown as separate cases. However, two or three of (1) to (3) may be arbitrarily combined.

1 is a block diagram illustrating an image reproduction device according to a first embodiment of the present invention. It is a state transition diagram expressing the state transition relationship of the sound effect reproduction management unit of the image reproduction apparatus according to the first embodiment. It is a table | surface showing the state of FIG. It is a block diagram which shows the image reproduction apparatus which concerns on the 2nd Embodiment of this invention. It is a state transition diagram expressing the state transition relationship of the mixer setting management part of the image reproducing device which concerns on 2nd Embodiment. It is a table | surface showing the state of FIG. It is a block diagram which shows the image reproduction apparatus which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Image reproduction apparatus, 110 ... Moving image / sound memory | storage part, 121 ... Video decoder, 122 ... Audio decoder, 131 ... Video component jitter, 132 ... Audio mixer, 141 ... Program information memory | storage part, 142 ... Status information memory | storage part, 150 ... program execution unit, 161 ... graphic renderer, 162 ... sound effect reproduction management unit, 171 ... graphic decoder, 172 ... sound effect decoder, 181 ... rendering timing generation unit, 182 ... program execution timing generation unit, 200 ... image reproduction device, 241 ... Program information storage unit, 242 ... Status information storage unit, 250 ... Program execution unit, 291 ... Mixer setting management unit, 292 ... Mixer setting unit, 300 ... Image playback device, 341 ... Program information storage unit, 342 ... Status information Storage unit, 350 ... Program Execution unit, 391 ... display effect setting management unit, 392 ... display effect setting unit

Claims (8)

A first synchronization signal generator for generating a first synchronization signal;
A second synchronization signal generating unit that generates a second synchronization signal having a period different from that of the first synchronization signal;
An image generation unit that generates image data in synchronization with the second synchronization signal;
A signal generator for generating a predetermined signal in synchronization with the first synchronization signal;
A control unit for issuing a command for controlling generation of the predetermined signal;
A signal generation management unit for managing a command to the signal generation unit, a state transition based on the command from the control unit and the first synchronization signal;
A first storage unit for storing state information indicating a state of the signal generation management unit;
A second storage unit for storing a state transition table describing a state transition of the signal generation management unit,
The state transition table is
By receiving a command from the control unit, the signal generation management unit shifts from a first state in which the command is not held to a second state in which the command is held,
The reception of the second synchronization signal indicates that the signal generation management unit issues a command to the signal generation unit and shifts from the second state to the first state or another state.
An image reproducing apparatus characterized by that. The predetermined signal is an audio signal;
The state transition table is
When the audio signal reproduction start command is received from the control unit, the signal generation management unit shifts from a first state where the reproduction start command is not held to a second state where the reproduction start command is held,
In response to the reception of the second synchronization signal, the signal generation management unit issues an audio signal reproduction start command to the signal generation unit, and the third state in which the reproduction start command is not suspended from the second state. Represents the transition to
The image reproducing apparatus according to claim 1, wherein: The state transition table is
Upon receipt of the audio signal reproduction stop command from the control unit, the signal generation management unit changes from the third state to the fourth state in which the reproduction start command is not suspended but the reproduction stop command is suspended. Representing migration,
The image reproducing apparatus according to claim 2, wherein: The state transition table is
Upon receipt of the first synchronization signal, the signal generation management unit issues an audio signal reproduction stop command to the signal generation unit, and holds the reproduction start command and the reproduction stop command from the fourth state. Represents a transition to the fifth state,
The image reproduction apparatus according to claim 3. The image reproducing device is
An audio playback unit for playing back audio signals from image and audio streams;
An audio adjustment unit that adjusts the reproduced audio signal in synchronization with the second synchronization signal;
The image reproduction apparatus according to claim 1, wherein the predetermined signal is a setting signal to the sound adjustment unit. The image reproduction device further includes an image reproduction unit that reproduces an image signal from an image / sound stream in synchronization with the second synchronization signal;
The image reproduction apparatus according to claim 1, wherein the predetermined signal is a display effect setting signal to the image reproduction unit. A step in which the control unit issues a command to the signal generation management unit in synchronization with the first synchronization signal;
Based on a command issued by the control unit, the signal generation management unit transitions from a first state in which the command is not suspended to a second state in which the command is suspended;
In synchronization with a second synchronization signal, the signal generation management unit issues a command to the signal generation unit to shift from the second state to the first state or another state;
Based on a command issued by the signal generation management unit, the signal generation unit reproduces sound;
An image reproduction method comprising: The predetermined signal is an audio signal;
The command from the control unit is an audio signal reproduction start command.
8. An image reproducing method according to claim 7, wherein

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