JP2002184110A - Disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk player capable of continuing the reproducing of data without a time limit while keeping the quality of reproduced data satisfactory even under environment where disturbance such as vibration always exists. SOLUTION: This disk player is provided with a mode in which the player stores the data recorded on a disk 100 in a second storage part 6 being a static storing means which is not accompanied with mechanical action in writing and reading data and a mode in which the player reads the data from the second storage part 6 and reproduces the data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk player for reproducing data recorded on a disk-shaped recording medium such as an MD (mini disk).

[0002]

2. Description of the Related Art A schematic block diagram of a conventional disk player is shown in FIG. In the figure, 101 is a reading unit,
Reference numeral 102 denotes a reproduction processing unit, 103 denotes a storage unit, 104 denotes a decompression processing unit, and 105 denotes a D / A conversion unit.

An operation for reproducing data recorded on the disk 100 will be described. Reading unit 101
Rotates the disc 100 at a predetermined speed, irradiates the disc 100 with light, and converts reflected light from the disc 100 into an electric signal, thereby
The data recorded in 00 is read. Reproduction processing unit 1
Numeral 02 performs demodulation processing for the modulation processing performed at the time of recording and error correction processing on the data read by the reading unit 101, and outputs the data.

[0004] The storage unit 103 reduces the transfer rate of the data output from the reproduction processing unit 102 by reducing the transfer rate.
4 is provided for input to the reproduction processing unit 102.
Temporarily stores the data output from. The recording unit 103 is configured by a static storage unit such as a semiconductor memory (a storage unit that does not involve a mechanical operation for writing and reading data).

[0005] The decompression processing unit 104 decompresses the data output from the storage unit 103 and converts it into a PCM signal. D /
The A conversion unit 105 converts the PCM obtained by the decompression processing unit 104
Convert the signal to an analog signal. The analog signal obtained by the D / A converter 105 is output from a terminal OUT to the outside.

Here, the transfer rate of data output from the reproduction processing unit 102 is 1.4 [Mbps], but the transfer rate of data input to the decompression processing unit 104 is 300 [kbps].
It is. By utilizing the difference between the two transfer rates, for example, when the data recorded on the disk 100 is audio data, skipping and interruption of sound due to disturbance such as vibration can be prevented.

For example, assuming that the capacity of the storage unit 103 is 1 [Mbit], the storage unit 103 stores approximately 0.9 seconds (1 [Mbit] / (1.4).
[Mbps] -300 [kbps])). If data cannot be read from the disk 100 due to disturbances such as vibration, it takes about 3 seconds (1 [Mbit] @ 300 [kbps])
Can continue to send data from the storage unit 103 to the decompression processing unit 104. If data reading is resumed from the position on the disk 100 where reading was interrupted during the three seconds, the data stored in the storage unit 103 becomes empty. No sound interruption occurs.

[0008]

However, in the disk player having the above-described structure, the time during which data can be properly reproduced even when disturbances such as vibrations continue is determined by the capacity of the storage unit. In environments where disturbances such as vibrations are always present, such as during jogging, it was not possible to keep the quality of the reproduced data good and continue to reproduce the data without any time limit. .

In view of the above, the present invention enables the reproduction of data to be continued without limitation of time while maintaining the quality of the reproduced data even in an environment where disturbance such as vibration is always present. It is intended to provide a disc player.

Another object of the present invention is to provide a disk player having an enhanced function of protecting the copyright of data recorded on a disk, in addition to the above objects.

[0011]

According to the present invention, there is provided a disk player for reproducing data recorded on a disk, which is a disk-shaped recording medium.
A static storage unit that does not involve mechanical operation for writing and reading data, and a second compression method in which data read from the disk is a first compression algorithm and has a higher compression rate than the first compression algorithm. Means for detecting whether data is compressed by an algorithm, and means for converting data read from the disk to a state compressed by the second compression algorithm. The first to read and play
Operating mode and reading data from the disk,
When the read data is compressed by the first compression algorithm, the read data is stored in the static storage unit after being processed by the data conversion unit, and is compressed by the second compression algorithm. In this case, there are provided a second operation mode in which the data is stored in the static storage means as it is, and a third operation mode in which data is read from the static storage means and reproduced.

According to this configuration, the user can set the second operation mode and store the data recorded on the disk in the static storage means in advance, and the third operation mode can be used. By setting the operation mode, data can be read from the static storage means and reproduced. The data read from the disk is stored in the static storage unit in a state where the data is compressed by a compression algorithm having a high compression ratio.

The speed at which data is read from the disk is variable, and the speed at which data is read from the disk is higher in the second operation mode than in the first operation mode. Thus, when data is read from the disk and stored in the static storage unit, the data is read from the disk at a higher speed than when data recorded on the disk is reproduced.

Further, according to the present invention, in the disc player having the above structure, the disc is detachable from the disc player, and means for detecting whether or not the disc is mounted on the disc player. Means for switching between supplying / not supplying power to the static storage means or means for erasing data stored in the static storage means, and when the disk is not mounted, the static Means for controlling so that power is not supplied to the storage means or data stored in the static storage means is erased.

With this configuration, when the disc is removed from the disc player, power is not supplied to the static storage means, or data stored in the static storage means is erased.

Further, according to the present invention, in the disk player having the above configuration, the static storage means is detachable from the disk player, and whether or not the static storage means is mounted on the disk player. Means for detecting whether or not the static storage means is not mounted on the disc player, setting the disc player to the first operation mode, and setting the static storage means to the disc player. Operation mode setting means for setting to the second or third operation mode when the camera is mounted on the camera.

According to this configuration, the user can set the first operation mode by removing the static storage means from the disk player, and by attaching the static storage means to the disk player, the first operation mode can be set. The second or third operation mode can be set.

If the static storage means is constituted by volatile storage means and the static storage means has no power supply, when the static storage means is removed from the disk player, Data stored in the static storage means is deleted.

In the disk player having the above-mentioned configuration, when data is read from the disk and reproduced, the static storage means may be used to convert a data transfer rate.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of a disc player according to a first embodiment of the present invention. In the figure, 1 is a reading unit, 2 is a reproduction processing unit, 3 is a compression algorithm detection unit, 4 is a first storage unit, 5 is a data conversion unit, 6 is a second storage unit, 7 is an expansion processing unit, Reference numeral 8 denotes a D / A conversion unit, 9 denotes an operation mode setting unit, 10 denotes a disk reproduction control unit, and 11 denotes a memory control unit.

The reading unit 1 includes a disk reproduction control unit 10
The disk 100 is rotated at the speed designated by the
The data recorded on the disc 100 is read by converting the reflected light from 0 into an electric signal. The reproduction processing unit 2 performs demodulation processing on the data read by the reading unit 1 with respect to the modulation processing performed at the time of recording.
Then, the data is subjected to error correction processing and output.

The compression algorithm detecting unit 3 determines whether the data output from the reproduction processing unit 2 is a first compression algorithm (for example, ATRAC) or a second compression algorithm (for which the compression ratio is higher than the first compression algorithm). For example, it detects which of ATRAC3) is used for compression. Note that the detection result of the compression algorithm detection unit 3 is as follows:
It is provided to the decompression processing unit 7 and the memory control unit 11.

The first storage section 4 is provided for inputting data output from the reproduction processing section 2 to the decompression processing section 7 at a reduced transfer rate. Is temporarily stored. The data conversion unit 5 converts the data output from the first storage unit 4 from a state compressed by the first compression algorithm to a state compressed by the second compression algorithm, and outputs the data.

The second storage section 6 is provided for storing data output from the reproduction processing section 2 or the data conversion section 5. The first storage unit 4 and the second storage unit 6
Is composed of a static storage unit (a storage unit that does not involve a mechanical operation for writing and reading data) such as a semiconductor memory.

The expansion processing section 7 expands data output from the first storage section 4 or the second storage section 6 and converts it into a PCM signal. The D / A converter 8 converts the PCM signal obtained by the decompression processor 7 into an analog signal. The analog signal obtained by the D / A converter 8 is output from a terminal OUT to the outside.

One end of each of the switches 9-1, 9-2, and 9-3 is connected to the power supply voltage V _CC via resistors 9-4, 9-5, and 9-6, respectively. The input terminals I1, I2 and I3 are connected, and the other end is grounded. Therefore, the voltages input to the input terminals I1, I2, and I3 of the operation mode setting unit 9 are the switches 9-
When 1, 9-2 and 9-3 are OFF, respectively, they are at a high level, and when they are ON, they are at a low level. still,
In the disc player of the first embodiment, the switch 9-
1, 9-2, and 9-3 are turned on in response to user operations
/ OFF is switched.

The operation mode setting unit 9 sets the disc reproduction control unit 10, the memory control unit 11, and the decompression processing unit 7 when only the input terminal I1 is at a low level (that is, when only the switch 9-1 is ON). When the input terminal I2 is at a low level (that is, when only the switch 9-2 is ON), the second operation mode is set, and only the input terminal I3 is set. When the switch is at a low level (that is, when only the switch 9-3 is ON), the third operation mode is set.

The disk reproduction control section 10 controls the operations of the reading section 1 and the reproduction processing section 2 according to the type of operation mode set by the operation mode setting section 9.
Specifically, when the first operation mode is set, the rotation speed of the disk 100 by the reading unit 1 is set to a normal value, and the speed of the clock for data transfer processing in the reproduction processing unit 2 is set. To the normal value.

When the second operation mode is set, the rotation speed of the disk 100 by the reading unit 1 is set to a value N times the normal value, and the clock for the data transfer process in the reproduction processing unit 2 is set. Set the speed to N times the normal value. Then, when the first operation mode or the second operation mode is set, when an instruction to start reproduction is input, the operation of the reading unit 1 and the reproduction processing unit 2 is started. When the third operation mode is set, the reading unit 1 and the reproduction processing unit 2 are not operated.

The memory control unit 11 includes an operation mode setting unit 9
The operation of the first storage unit 4 and the second storage unit 6 is controlled in accordance with the type of operation mode set by the above and the detection result of the compression algorithm detection unit 3. Specifically, when the first operation mode is set, the first operation mode is set.
The storage unit 4 is enabled (operable state), the second storage unit 6 is disabled (inoperable state), and data output from the reproduction processing unit 2 is transmitted through the first storage unit 4. To be input to the decompression processing unit 7.

When the second operation mode is set, if it is detected that the data output from the reproduction processing unit 2 is compressed by the first compression algorithm, the first operation is performed.
The storage unit 4 and the second storage unit 6 are enabled, and the data output from the data conversion unit 5 is the second storage unit.
If the data output from the reproduction processing unit 2 is detected to be compressed by the second compression algorithm, the first storage unit 4 is dis- played. In the enable state, the second storage unit 6 is enabled, and control is performed so that data output from the reproduction processing unit 2 is stored in the second storage unit 6.

When the third operation mode is set, the first storage unit 4 is disabled, the second storage unit 6 is enabled, and the second storage unit 6 is enabled.
Is controlled so that the data stored in is read out.

The decompression processing section 7 is provided with an operation mode setting section 9
Is set to the first operation mode by
If the compression algorithm detection unit 3 detects that the data output from the reproduction processing unit 2 is compressed by the first compression algorithm, the compression algorithm detection unit 3 performs an expansion process for the first compression algorithm, while the reproduction processing unit If it is detected that the data output from the second compression algorithm is compressed by the second compression algorithm, the decompression processing for the second compression algorithm is performed on the data read from the first storage unit 4 respectively. It has become. Also, the decompression processing unit 7
When the third operation mode is specified, the decompression process for the second compression algorithm is performed on the data read from the second storage unit 6.

In summary, when an instruction to start reproduction is given in a state where the switch 9-1 is ON and the switches 9-2 and 9-3 are OFF (first operation mode), the disc 1
00 is read by the reading unit 1 at a normal speed, and transferred in the order of the reproduction processing unit 2, the first storage unit 4, the decompression processing unit 7, and the D / A conversion unit 8, Is reproduced in the same way as.

When the switch 9-2 is ON, the switch 9
When an instruction to start reproduction is given in a state where -1 and 9-3 are OFF (second operation mode), the disc 100
Is read by the reading unit 1 at N times the normal speed, processed by the reproduction processing unit 2, and then compressed by the first compression algorithm. After being converted to a state compressed by the second compression algorithm by the data conversion unit 5 via the storage unit 4, the data is stored in the second storage unit 6, and if the data is compressed by the second compression algorithm, Is stored in the second storage unit 6
Is stored in

When the switch 9-3 is ON, the switch 9
When an instruction to start reproduction is given in a state where -1 and 9-2 are OFF (third operation mode), the second recording unit 6
The data is read out from the memory, transferred to the decompression processing unit 7 and the D / A conversion unit 8 in this order, and the data stored in the second storage unit 6 is reproduced.

With the above configuration, in the disc player of the first embodiment, the data recorded on the disc 100 is stored in the second storage unit by giving the reproduction start instruction after setting the second operation mode. If the operation of storing the data in the storage unit 6 is performed in advance, the data is read out from the second storage unit 6 serving as the static storage unit and reproduced by giving an instruction to start reproduction after setting the operation mode to the third operation mode. Therefore, even in an environment where disturbance such as vibration is always present (for example, when using a portable type during jogging), the quality of the reproduced data is kept good and the time is not limited. The data can be continuously reproduced. For example, when the audio data is recorded on the disc 100, the user can perform the operation without skipping or interruption. You can continue to listen to music without restriction of time.

In this embodiment, the disc 100
Since the data read from is stored in the second storage unit 6 after being compressed by the second compression algorithm having a high compression ratio, the capacity of the second storage unit 6 can be reduced. Further, in the present embodiment, in the second operation mode, reading and transfer from the disk 100 are performed at N times the normal speed, so that data recorded on the disk 100 is stored in the second storage unit. 6 can be shortened.

FIG. 2 is a block diagram showing a disc player according to a second embodiment of the present invention. In the figure, reference numeral 12 denotes a disk mounting detection unit, 13 denotes a memory control unit, and 14 denotes a second
Is a switch for switching between supplying and not supplying power to the storage unit 6. The second embodiment differs from the first embodiment whose block diagram is shown in FIG. 1 in that a disk mounting detection unit 12 and a switch 14 are newly added,
The only difference is that a memory control unit 13 is provided instead of the memory control unit 11, and only this difference will be described.

The disk 100 is detachable from the disk player, and the disk mounting detector 12 detects whether the disk 100 is mounted on the disk player. The detection result of the disk mounting detection unit 12 is given to the memory control unit 13. Incidentally, even if the main power of the disk player is turned off, the disk mounting detection unit 12 is supplied with a backup power supply or the like, and the disk
It is assumed that whether or not is mounted is always detected.

The memory control unit 13 includes an operation mode setting unit 9
The first storage unit 4 and the second storage unit 4 in accordance with the type of operation mode set by the control unit, the detection result of the compression algorithm detection unit 3, and the detection result of the disk mounting detection unit 12.
Of the storage unit 6 is controlled. The operation mode setting unit 9
Sets the operation mode of the memory control unit 13 in the same manner as performed for the memory control unit 11 in the first embodiment.

More specifically, when the disk 100 is mounted, the memory control unit 13 performs the first operation in the same manner as the memory control unit 11 in the first embodiment according to the set operation mode. The storage unit 4 and the second storage unit 6 are controlled, and the switch 14 is turned on so that power is supplied to the second storage unit 6.

On the other hand, when the disc 100 is not mounted, the second mode is set regardless of the set operation mode.
The storage unit 6 is disabled, and the switch 14 is turned off so that power is not supplied to the second storage unit 6.

With the above configuration, in the disc player of the second embodiment, even in an environment where disturbances such as vibrations are always present, data can be reproduced without any time limit while maintaining good reproduction data quality. In addition to the effect that the disc 100 can be continuously
The storage unit 6 is disabled, and the second
Since the power supply to the storage unit 6 is interrupted, if the second storage unit 6 is constituted by volatile storage means, the disk 1
The data read from 00 and stored in the second storage unit 6 is erased, and the copyright of the data recorded on the disc 100 can be protected.

In the second embodiment, means for erasing data stored in the second storage section 6 is provided, and when the disc 100 is removed from the disc player, the second storage section 6 The stored data may be deleted. With this configuration, even if the second storage unit 6 is configured by a non-volatile storage unit,
Can protect the copyright of the data recorded in the. If the second storage unit 6 is constituted by non-volatile storage means, from the viewpoint of the user, the data stored in the second storage unit 6 will not be erased unless the disk 100 is removed even if the main power is turned off. Therefore, when power is turned on again, the second
It is not necessary to re-store the data in the storage unit 6 of the present embodiment, which is convenient.

FIG. 3 is a block diagram showing a disk player according to a third embodiment of the present invention. In the figure, reference numeral 15 denotes a memory mounting detection unit, and 16 denotes a combination logic unit. The third embodiment differs from the second embodiment whose block diagram is shown in FIG. 2 in that a recording unit attachment detection unit 15 and a combination logic unit 16 are newly added, and a memory control unit 1 is added.
3 in place of the memory control unit 1 in the first embodiment.
1 is different only in that the recording unit attachment detection unit 15 and the combination logic unit 16 that are newly added will be described.

In the third embodiment, the second storage section 6 is constituted by a memory card or the like, and is detachable from a disk player. Memory mounting detector 15
Detects whether or not the second storage unit 6 is mounted on the disc player. The detection result of the memory attachment detection unit 15 is given to the combination logic unit 16. The detection result of the disk mounting detection unit 12 is also given to the combination logic unit 16.

The combination logic unit 16 stores the second storage unit 6
When is not attached, switch 9-1 is turned on,
The switches 9-2 and 9-3 are turned off. On the other hand, when the second storage unit 6 is mounted, if the disk 100 is mounted, the switch 9-2 is turned on, and the switch 9 is turned on.
-1 and 9-3 are turned off, and if the disc 100 is not mounted, the switch 9-3 is turned on and the switch 9-
Turn off 1 and 9-2.

With the above configuration, in the disc player according to the third embodiment, when the second storage section 6 is removed, the first operation mode is automatically set.
The user simply gives an instruction to start playback, and
0 can be reproduced. In addition, while the second storage unit 6 is mounted, the disk 1
00 is automatically set to the second operation mode, so that the user only needs to give an instruction to start reproduction, and the data recorded on the disc 100 can be stored in the second storage unit 6. Can be stored. When the second storage unit 6 is mounted and the disc 100 is not mounted, the third operation mode is automatically set. Therefore, the user only needs to give a reproduction start instruction, The data stored in the second storage unit 6 can be reproduced.

If the second storage unit 6 is configured by volatile storage means and the second storage unit 6 is configured to have no power supply, the second storage unit 6 can be stored in a disk. When the disk 100 is removed from the player, the data stored in the second storage unit 6 is erased.
Can protect the copyright of the data recorded in the.

As shown in FIG. 4, in the first embodiment, the first storage unit 4 and the second storage unit 6 are replaced by one storage unit, and the storage unit 17 is replaced by the memory control unit 18. You may make it control. The data output from the reproduction processing unit 2 is input to the storage unit 17 as it is, and is input via the data conversion unit 5.

In this case, when the first operation mode is set, the memory control unit 18 lowers the transfer rate of the data output from the reproduction processing unit 2 by reducing the transfer rate.
In the case where the recording unit 17 is used to input the data to the second processing mode and the data output from the reproduction processing unit 2 is compressed by the first compression algorithm, the data conversion is performed. If the data output from the means 5 is that the data output from the reproduction processing unit 2 is compressed by the second compression algorithm, the data output from the reproduction processing unit 2 is stored in the storage unit 17, respectively. When the third operation mode is set, control may be performed so that data stored in the storage unit 17 is read.

Similarly, in the above-described second and third embodiments, one storage unit may be selectively used as the first storage unit 4 and the second storage unit 6.

[0054]

As described above, according to the disc player of the present invention, the mode for storing data recorded on the disc in the static storage means, and the data is read out from the static storage means and reproduced. In the environment where disturbance such as vibration is always present (for example, when using a portable type during jogging), the quality of the reproduced data is kept good and the time is limited. You can continue to play data without it.

Since the data read from the disk is stored in the static storage means after being compressed by a compression algorithm having a high compression ratio, the capacity of the static storage means can be reduced.

According to the disk player of the present invention, when data is read from the disk and stored in the static storage means, the data is read from the disk faster than when reproducing the data recorded on the disk. , The time required to store the data recorded on the disk in the static storage means can be reduced.

According to the disc player of the present invention, when the disc is taken out from the disc player,
Since power is not supplied to the static storage unit or data stored in the static storage unit is deleted, in the former case, the static storage unit is configured by a nonvolatile storage unit. This is a condition, but the copyright of the data recorded on the disc can be protected.

According to the disc player of the present invention, when the static storage means is removed, a mode for reproducing data recorded on the disc is set, and when the static storage means is attached, A mode in which data is read from a disk and stored in the static storage means, or
Since the mode for reproducing the data stored in the static storage unit is set, the operation required for the user to switch the mode is simplified.

Further, according to the disk player of the present invention, when the static storage means is removed, the data stored in the static storage means is erased, so that the copyright of the data recorded on the disk is Can be protected.

[Brief description of the drawings]

FIG. 1 is a block diagram of a disc player according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a disc player according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a disc player according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a disc player according to another embodiment of the present invention.

FIG. 5 is a block diagram of a conventional disc player.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 reading unit 2 reproduction processing unit 3 compression algorithm detection unit 4 first storage unit 5 data conversion unit 6 second storage unit 7 expansion processing unit 8 D / A conversion unit 9 operation mode setting unit 10 disk reproduction control unit 11 memory Control unit 12 Disk mounting detection unit 13 Memory control unit 14 Switch 15 Memory mounting detection unit 16 Combination logic unit 17 Storage unit 18 Memory control unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G06K 19/00 G06K 19/00 Q

Claims (6)

[Claims] 1. A disk player for reproducing data recorded on a disk, which is a disk-shaped recording medium, comprising: a static storage unit that does not involve mechanical operation for writing and reading data; Means for detecting whether the read data is compressed by a first compression algorithm or a second compression algorithm having a higher compression rate than the first compression algorithm; and a means for detecting whether the read data is read from the disk. Means for converting data into a state compressed by the second compression algorithm, a first operation mode for reading and reproducing data from the disk, and reading data from the disk and converting the read data. , When the data is compressed by the first compression algorithm, the data is processed by the data conversion means, If the data is compressed by the second compression algorithm, a second operation mode is stored as it is in the static storage means, and a second operation mode in which data is read from the static storage means and reproduced. 3
A disc player characterized by the following: 2. The data reading speed from the disk is variable, and the speed at which data is read from the disk is higher in the second operation mode than in the first operation mode. 2. The disc player according to claim 1, wherein: 3. A means for detecting whether or not the disc is mounted on the disc player, and means for supplying power to the static storage means. Means for switching on / off or means for erasing data stored in the static storage means, and when the disk is not mounted, power is not supplied to the static storage means, or 3. The disc player according to claim 1, further comprising: means for controlling data stored in said static storage means to be erased. 4. The means for detecting whether or not the static storage means is detachable from the disc player, detecting whether the static storage means is mounted on the disc player, and the static storage means. When the means is not attached to the disc player, the disc player is set to the first operation mode, and when the static storage means is attached to the disc player, 3. The disc player according to claim 1, further comprising: an operation mode setting unit configured to set the operation mode to the second or third operation mode. 5. The disk player according to claim 4, wherein said static storage means is volatile and has no power supply. 6. The data storage device according to claim 1, wherein the data is read from the disk and reproduced, and the static storage unit is used to convert a data transfer rate.
6. The disc player according to any one of claims 1 to 5.