JP2000315352A - Reproducing device of recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the power consumption in the reproduction stopping state and to shorten the waiting time at the time of starting the reproduction, in a reproducing device such as an MD(mini-disk). SOLUTION: A power source 11 for control to supply the power for a microcomputer 13 executing the reproduction control and a power source 12 for reproduction to supply the operating power to a mechanical driver 14, RF circuit 15, DSP 16 and memory 17, are individually controlled by an external microcomputer 20. Further the microcomputer 13 controls switch circuits 18, 19. The TOC information to be referred at the reproduction of the MD is stored in the memory 17. The memory 17 is constituted of a DRAM, and its control is performed by utilizing the function of the DSP 16. The power source 12 for reproduction is set to be turned on to control the switch circuit 19 to be turned off. A command to operate only the DRAM control circuit part is given to the DSP 16, then the reduction of the power consumption is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reproducing recorded information from a recording medium such as a mini disk (hereinafter abbreviated as "MD") or a compact disk (hereinafter abbreviated as "CD"). The present invention relates to a reproducing apparatus for a recording medium, and more particularly to a power supply control thereof.

[0002]

2. Description of the Related Art Conventionally, a configuration as shown in FIG.
Power control of the D playback device is performed. The MD playback device includes two power supplies, a control power supply 1 and a reproduction power supply 2. The control power supply 1 supplies operation power to a control microcomputer (hereinafter abbreviated as “microcomputer”) 3. A reproduction power supply 2 is a mechanical driver 4 that reads a signal representing information recorded by mechanically displacing the MD.
An RF circuit 5 that performs analog processing of a signal read by the mechanical driver 4, a digital signal processor (hereinafter, referred to as “digital signal processor”) that converts an analog signal processed by the RF circuit 5 into a digital signal and performs digital signal processing according to a preset program. DSP)), and D
Operational power is supplied to the memory 7 used for storing data and the like at the time of digital signal processing by the SP 6. The electric power supplied from the power supply for reproduction 2 to the mechanical driver 4, the RF circuit 5, the DSP 6 and the memory 7 passes through the switch circuit 8, and the switch circuit 8 is turned on / off by the microcomputer 3.
Is controlled.

[0003] In the MD, the TOC (Table Of Con-
It is necessary to read reference information called tents) or UTOC (User's TOC) from a predetermined position on the MD. Since the TOC and the UTOC are stored near the center of the MD which is a disc-shaped recording medium, the reading operation of the TOC or the like needs to be accompanied by a mechanical operation such as movement of a pickup.
For example, when the TOC needs to be read while the vicinity of the outermost periphery of the MD is being reproduced by the pickup, it takes a time of about several seconds, which causes a situation that a user of the MD reproducing apparatus feels a long waiting time. . Therefore, the same MD
At the time of a stop operation during reproduction or the like, the TOC information is stored in the RAM incorporated in the microcomputer 3 and the TOC information stored in the microcomputer 3 is used at the start of the next reproduction, so that a new TOC information is obtained. The reading operation is omitted to reduce the waiting time. Therefore, at the time of the stop operation, the control power supply 1 is kept in the ON state, and in order to reduce the power consumption during the stop, the microcomputer 3 sends the mechanical driver 4 and the RF circuit from the reproduction power supply 2 through the switch circuit 8. 5, D
The power supply to the SP 6 and the memory 7 is stopped.

[0004]

In the configuration shown in FIG. 5, TOC information and the like are stored in the RAM in the microcomputer 3. However, the storage capacity of the RAM incorporated in the microcomputer 3 does not become very large. The built-in R
When the storage capacity of the AM is increased, the cost of the microcomputer 3 is greatly increased.

When information is recorded on the MD, information that has been subjected to data compression processing is stored. The MD playback device also performs decompression processing of data compressed by the DSP 6. Therefore, a large-capacity memory 7 is required, and a dynamic RAM (hereinafter abbreviated as “DRAM”) is generally used. If the TOC information is also stored in the memory 7,
There is no need to store the TOC information in the built-in RAM of the microcomputer 3. However, since the memory 7 cannot receive the power supply from the reproducing power supply 2 during the stop operation, the stored information is erased. For this reason, it is possible to store the TOC information, but the TOC information stored when the reproduction is stopped.
The information is erased, and at the start of reproduction, the TOC information must be read again.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a reproducing apparatus for a recording medium such as an MD to minimize power consumption during a reproduction waiting time,
An object of the present invention is to provide a recording medium reproducing apparatus capable of minimizing a waiting time when starting reproduction.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a recording medium reproducing apparatus for reproducing a recorded content by mechanically driving a recording medium in which reference information about the recorded content is recorded in a predetermined area. A reproduction control circuit that stores the reference information in advance and performs electrical control for reproducing information from the recording medium according to the stored reference information, and is recorded from the recording medium according to control by the reproduction control circuit. A reproduction mechanism for reading information as a reproduction signal, a processing circuit for processing a reproduction signal read by the reproduction mechanism under the control of the reproduction control circuit to reproduce information, and a control circuit for supplying operating power to the reproduction control circuit A power supply, a reproduction power supply for supplying operation power to the reproduction mechanism and the processing circuit, and a power supply control circuit capable of independently controlling ON / OFF of the control power supply and the reproduction power supply. A reproducing device for a recording medium, which comprises.

According to the present invention, a recording medium on which reference information about recorded contents is recorded in a predetermined area is mechanically driven by a reproducing apparatus to reproduce the recorded contents. The reproduction control circuit preliminarily stores reference information recorded in a predetermined area of the recording medium, and performs electrical control for reproducing information from the recording medium. The playback mechanism is controlled by a playback control circuit to read information recorded from the recording medium as a playback signal. The processing circuit processes a reproduction signal read by the reproduction mechanism to reproduce information. The control power supply supplies operation power to the reproduction control circuit. The reproduction power supply supplies operation power to the reproduction mechanism and the processing circuit. The power supply control circuit can independently control ON / OFF of the control power supply and the reproduction power supply. If the control power supply is turned on, the playback power supply will be turned off.
Even if it is set to F, the reproduction control circuit that stores the reference information receives the power for operation, so that the reference information can be stored. When shifting from the reproduction stop state to the reproduction start state, it is only necessary to supply operating power to the reproduction mechanism and the processing circuit, and it is not necessary to read the reference information again from the recording medium. Since there is no waiting time for reading the TOC or the like, the waiting time from the reproduction instruction to the start of reproduction can be reduced. The power supply for playback is
Since the control can be performed independently of the control power supply, for example, the reproduction power supply is kept ON for a time when it is considered that the reproduction instruction is continuously given to the recording medium. By controlling the power supply for reproduction to be OFF, it is possible to improve the responsiveness when the reproduction instruction is continuously given and to reduce the power consumption when the reproduction instruction is not given.

In the invention, it is preferable that the power supply control circuit controls the control power supply to be ON and the reproduction power supply to be OFF in a normal reproduction stop state.

According to the present invention, in a normal reproduction stop state, control is performed such that the control power supply is turned on and the reproduction power supply is turned off, so that reference information and the like are stored in the reproduction control circuit, and It is possible to wait in a state where power consumption is reduced by stopping the operation of the reproduction mechanism and the processing circuit.

The present invention further comprises control instructing means, and the power supply control circuit responds to a predetermined input to the control instructing means so that the reproduction power supply is turned off from the normal reproduction stop state.
N is controlled.

According to the present invention, the reproduction power is controlled to be turned on in response to a predetermined input to the control instruction means from the state where the reproduction power is turned off in the reproduction stopped state. When the reproduction from the recording medium is started, the operating power is already supplied to the reproduction mechanism and the processing circuit, so that the waiting time can be minimized.

In the present invention, the reproduction control circuit stores the reference information in a memory in a processing circuit, and the control instructing means supplies operation power when the reproduction power supply is turned on. And a selecting unit for selecting an object to be included so as to include the memory.

According to the present invention, the target to which the power for operation is supplied when the power for reproduction is turned on can be selected by the selection means provided in the control instruction means. Based on the time required
The power supply target can be selected.

In the present invention, the power supply control circuit turns on power supply to a target whose operation power supply is controlled to be off by selection by the selection means when starting reproduction from a reproduction stop state. The operation is controlled so that the operation is restored.

According to the present invention, the reproduction from the recording medium is started by controlling the power supply to the object selected so that the operating power is turned off by the selection means, and the reproduction from the recording medium is started. As a result, even in the reproduction standby state, the target for which the supply of the operating power is ON can immediately perform the reproduction operation, and can shift to the reproduction state with a minimum waiting time.

Further, the present invention comprises a function instructing means capable of instructing a function with a minimum power consumption and a function with a minimum waiting time for reproduction, and the power supply control circuit instructs the function instructing means to the function with the minimum power consumption. At this time, the power for reproduction is controlled to be turned off, and when the function instructing the function with the minimum reproduction wait time is instructed by the function instructing means, the power for reproduction is turned on and the object to which the power for operation is supplied is set. The selection control is performed.

According to the present invention, the function with the minimum power consumption and the function with the minimum reproduction waiting time can be instructed by the function instructing means. When the function with the minimum power consumption is instructed, the reproduction power supply is turned off. When the function for minimizing the reproduction waiting time is instructed, the reproduction power is turned on and the control for selecting the target to which the operation power is supplied is performed. The function can be selected according to the user's convenience or environment.

Further, according to the present invention, the reproduction control circuit includes a microcomputer for performing control in accordance with a preset program, and a memory for storing the reference information.

According to the present invention, the reproduction control circuit includes a microcomputer for performing control in accordance with a preset program, and a memory for storing reference information. Therefore, the microcomputer stores the reference information. Therefore, much reference information can be stored in the memory.

[0021]

FIG. 1 shows a schematic electrical configuration of an MD reproducing apparatus 10 according to an embodiment of the present invention.
The MD playback device 10 includes a control power supply 11 and a playback power supply 12. The control power supply 11 supplies operation power to the microcomputer 13 that controls reproduction of information from the MD. When reproducing information from an MD, a mechanical driver 14 as a reproducing mechanism for reading recorded information as a reproduced signal, and an RF circuit 15 for performing high-frequency amplification and analog processing of the read reproduced signal. , A DSP 16 for performing digital signal processing according to a predetermined program on a signal analog-processed by the RF circuit 15, and a DSP 1
The operation power is supplied to the memory 17 used when performing the signal processing in Step 6. In the present embodiment, the microcomputer 13 turns on / off the power supplied from the reproduction power supply 12.
And a switch circuit 18 for switching between ON and OFF.
The control for the switch circuit 19 for switching to F is performed. The control power supply 11 and the reproduction power supply 12 are turned on / off independently by an external microcomputer 20 which is a power supply control circuit.
The OFF state is controlled. The RF circuit 15, the DSP 16, and the memory 17 function as a processing circuit that performs processing for information reproduction on the reproduction signal read by the mechanical driver 14. The memory 17 is formed of, for example, a DRAM, and is used when the DSP 16 performs expansion processing of information recorded in the MD by digital signal processing. The DRAM needs to perform a predetermined refresh operation or the like, but the control for the refresh operation is performed by the DSP 16. Since the memory 17 using a DRAM has a large storage capacity, TOC information can also be stored.

However, if the reproduction power supply 12 is turned off as usual in the reproduction stopped state, the operating power is not supplied to the memory 17, so that the TOC information stored at the start of reproduction cannot be used. In the present embodiment, even when the reproduction is stopped, the reproduction power supply 12 is turned on without being turned off.
The switch circuit 18 is turned on and the switch circuit 19 is turned off. As a result, the operating power is supplied to the DSP 16 and the memory 17 and the memory 17
Even if a DRAM is used, the stored contents can be retained. Since the switch circuit 19 is turned off, power consumption in the mechanical driver 14 and the RF circuit 15 can be avoided.

FIG. 2 shows the operation in the embodiment of FIG.
When the power source for the control power source 11 and the reproduction power source 12 is turned on in step a1, the operation starts. In step a2, the microcomputer 13 or the external microcomputer 20 performs a predetermined initialization process. In step a3, it is determined whether or not an MD is mounted on the mechanical driver 14. When the MD is not mounted, the process waits until the MD is mounted. If it is determined in step a3 that there is an MD, the TOC information is read in step a4. In step a5, the operation input switch 2 connected to the external microcomputer 20
First, it is determined whether or not an MD reproduction instruction is given. When it is determined that the reproduction instruction has not been given to the operation input switch 21 as the control instruction means, it is determined in step a6 whether or not the MD has been exchanged. When it is determined that the replacement has been performed, the process returns to step a4. If it is determined that the replacement has not been performed, the process returns to step a5. The determination of the presence or absence of the MD in step a3 and the determination of replacement of the MD in step a6 are performed based on detection information from a sensor provided in the MD insertion / ejection mechanism.

When it is determined in step a5 that a reproduction instruction is issued, the operation of the mechanical driver 14 is started in step a7. At this time, the microcomputer 13 controls the switch circuit 19 to be turned on. In step a8, when a stop instruction is given via the operation input switch 21, or when it is determined that the reproduction is completed and the reproduction is not stopped, the flow returns to step a7 to continue the reproduction. When it is determined in step a8 to shift to stop, stop control is performed in step a9. The stop control will be described later. When the stop control ends, at step a10, the operation input switch 2
Waiting for the reproduction instruction from the device 1, and when the reproduction instruction is performed, it is determined whether or not the MD is exchanged (discharged) in step a 11. If the MD is exchanged (discharged), the process proceeds to step a 3.
If the MD has not been exchanged (discharged), the flow returns to step a7.

FIG. 3 shows the contents of the stop control in step a9 of FIG. In step b1, the stop control is started, and in step b2, the external microcomputer 20 controls the control power supply 11.
Is turned on, the reproduction power supply 12 is turned on, and a mode selection command is set from the external microcomputer 20 to the microcomputer 13 in accordance with the input to the operation input switch 21. In step b3, the microcomputer 13 controls the switch circuits 18 and 19 according to the command given from the external microcomputer 20. In the present embodiment, the switch circuit 18 is turned on, and the switch circuit 19 is turned off.
The power supply to the mechanical driver 14 and the RF circuit 15 is controlled to be cut off. In step b4, the microcomputer 1
From 3, a command to stop operations other than the DRAM control circuit in the DSP 16 is given. By this, DS
In the P16 and the memory 17, only the portion required to hold the storage contents of the memory 17 constituted by the DRAM operates, and the power consumption can be reduced. Step b
At 5, the microcomputer 13 performs a stop process, and the microcomputer 13 shifts to a sleep mode or the like set as a low-power standby mode. At step b6, the stop control ends. The operation input switch 2 is also used for the external microcomputer 20.
When a stop instruction is input in step 1, it is preferable to shift to a sleep mode or the like for reducing power consumption.

FIG. 4 shows a schematic electrical configuration of an MD reproducing apparatus 30 as another embodiment of the present invention. In the present embodiment, the storage of TOC information includes 13 internal RAMs,
An external memory 31 is provided without using the memory 17. The external memory 31 uses a static RAM with low power consumption. In the present embodiment, portions corresponding to the embodiment of FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted. In this embodiment, when the reproduction is stopped, only the control power supply 11 is turned on.
Then, the reproduction power supply 12 is controlled to be turned off. Since the TOC information is stored in the external memory 31 to which the operation power is supplied from the control power supply 11, the external microcomputer 32 as the power supply control circuit turns off the reproduction power supply 12 at the start of reproduction.
From ON to T ON stored in the external memory 31.
A quick reproduction operation based on the OC information can be performed. Since the reproduction power supply 12 is controlled to be OFF when reproduction is stopped, power consumption can be minimized.

In the embodiment of FIG. 1 or the embodiment of FIG. 4, the external microcomputers 20 and 32 control the reproduction power supply 12 to be ON even when the reproduction is stopped, and to minimize the waiting time at the start of the reproduction. You can do it too. The operation input switch 21 is provided with a switch capable of switching between a function with minimum power consumption and a function with minimum playback wait time so that the user can easily understand the function. When the function with minimum power consumption is selected, the TOC information is stored. When the function that minimizes the power consumption from the reproduction power supply 12 is selected in a state where only the reproduction power supply 12 is possible and the reproduction wait time is minimized, the reproduction power supply 12 is kept ON even in the reproduction stop state. Control can also be performed.

The present invention can be similarly applied to reproduction of a compact disk (CD) or a digital video disk (DVD) for reproducing recorded contents with reference to TOC information.

[0029]

As described above, according to the present invention, reference information recorded at a predetermined position on a recording medium is stored, and reproduction is performed in accordance with the reference information to perform electrical control for reproducing information from the recording medium. The power supply control circuit performs ON / OFF control independently of the control power supply for supplying operation power to the control circuit and the reproduction power supply for supplying operation power to the reproduction mechanism and the processing circuit. Sometimes reduce power consumption,
It is possible to perform control for shortening the time required for starting from the reproduction device to the start of reproduction.

Further, according to the present invention, in a normal reproduction stop state, the power supply for control is turned on and the power supply for reproduction is turned off, so that power consumption can be minimized.

According to the present invention, according to a predetermined input to the control instruction means, the reproduction power is turned on even in the reproduction stop state.
, The waiting time from the reproduction stop state to the start of reproduction can be reduced.

Further, according to the present invention, it is possible to select the target to which the power for operation is supplied when the power for reproduction is turned on while the reproduction is stopped, by the selection means, so that the power consumption and the waiting time are reduced. In consideration of the above, an appropriate target can be selected.

Further, according to the present invention, control is performed such that the operation power is turned on at the start of reproduction for a target whose power supply from the reproduction power supply is turned off in the reproduction stop state. Therefore, the transition from the reproduction stop state to the reproduction start state can be performed smoothly.

Further, according to the present invention, the function with the minimum power consumption and the function with the minimum reproduction waiting time can be selected by the instruction to the function instruction means.

According to the present invention, much reference information can be stored in the memory while reducing the cost of the microcomputer.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic electrical configuration of an MD playback device 10 according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the MD playback device 10 of FIG.

FIG. 3 is a flowchart showing the contents of stop control in step a9 of FIG. 2;

FIG. 4 is a block diagram showing a schematic electrical configuration of an MD playback device 30 according to another embodiment of the present invention.

FIG. 5 is a block diagram showing a schematic electrical configuration of a conventional MD reproducing apparatus.

[Description of Signs] 10, 30 MD playback device 11 Control power supply 12 Playback power supply 13 Microcomputer 14 Mechanical driver 15 RF circuit 16 DSP 17 Memory 18, 19 Switch circuit 20, 32 External microcomputer 21 Operation input switch 31 External memory

Claims (7)

[Claims] An apparatus for mechanically displacing and driving a recording medium on which reference information about recorded contents is recorded in a predetermined area to reproduce the recorded contents stores the reference information in advance. A reproduction control circuit for performing electrical control for reproducing information from a recording medium according to the stored reference information, and a reproduction mechanism for reading information recorded from the recording medium as a reproduction signal according to control by the reproduction control circuit. A processing circuit for processing a reproduction signal read by a reproduction mechanism under the control of a reproduction control circuit to reproduce information; a control power supply for supplying operating power to the reproduction control circuit; a reproduction mechanism and a processing circuit And a power supply control circuit capable of independently controlling ON / OFF of the control power supply and the reproduction power supply. Reproducing apparatus of the recording media. 2. The power supply control circuit according to claim 1, wherein the control power supply is turned on in a normal reproduction stop state, and the reproduction power supply is turned off.
2. The recording medium reproducing apparatus according to claim 1, wherein the control is performed so as to be F. 3. A power supply control circuit, comprising: a control instructing means, wherein the power control circuit controls the reproduction power to be turned on from the normal reproduction stop state in response to a predetermined input to the control instructing means. 3. The apparatus for reproducing a recording medium according to claim 2, wherein: 4. The reproduction control circuit stores the reference information in a memory in a processing circuit, and the control instruction means determines a target to which operation power is supplied when the reproduction power is turned on. And selecting means for selecting to include the memory.
An apparatus for reproducing the recording medium described in the above. 5. The power supply control circuit, when starting reproduction from a reproduction stop state, turns on power supply to a target whose operation power supply is controlled to be OFF by selection by the selection means. 5. The recording medium reproducing apparatus according to claim 4, wherein the operation is controlled to return the operation. 6. A function instructing means capable of instructing a function with a minimum power consumption and a function with a minimum playback wait time, wherein the power supply control circuit, when the function with the minimum power consumption is instructed by the function instructing means, Control to control the reproduction power supply to be turned off, and to turn on the reproduction power supply and to select a target to which the operation power is supplied when the function instructing function minimizes the reproduction wait time. 2. The method according to claim 1, wherein
An apparatus for reproducing the recording medium described in the above. 7. The reproduction control circuit according to claim 1, wherein the reproduction control circuit includes a microcomputer that performs control in accordance with a preset program, and a memory that stores the reference information. A playback device for a recording medium according to any one of the above.