JP2002237132A - Data recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data recording and reproducing device capable of recording data on a single recording medium with a data compression ratio converted. SOLUTION: When a data of which the compression ratio is converted and the compression ratio for the data are specified among various kinds of data recorded in a recoding medium loaded on a recording and reproducing part 4, a CPU 1a reads from the recording medium a part of the data specified above, and outputs it to the recording and reproducing part 4 to let it reproduce the data. A compressing part 5 compresses the data being reproduced by the recording and reproducing part 4 by a specific compression method at the compression ratio specified above, and RAM 1c temporarily stores the data compressed by the compressing part 5, and the CPU 1a records the compressed data stored in the RAM 1c in a free area of the above recoding medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a data compression recording,
And a data recording / reproducing apparatus having the data reproducing function.

[0002]

2. Description of the Related Art Recently, with the rapid progress of digital technology, large-capacity data such as image data and audio data has become widely available, and such large-capacity data can be transmitted with a limited transmission capacity. In order to record data on a recording medium, a data compression technique is used. As a device for compressing such data by a predetermined compression method and recording and reproducing the data on a recording medium, for example, a data recording / reproducing device using a medium such as an MD is known.

[0003]

However, in the conventional data recording / reproducing apparatus, when the remaining capacity of the recording medium becomes small, the compression ratio of the data is reduced in order to reduce the capacity of the recorded data. When converting, the compression rate must be re-recorded from the original source using a different compression method, or once recorded on another recording medium, and then re-recorded on the original recording medium with a different compression rate. There was a problem that the conversion work was troublesome. Further, once the data compression ratio is converted on the same recording medium, there is a problem that the state before the compression ratio conversion cannot be restored.

It is an object of the present invention to provide a data recording / reproducing apparatus capable of recording data by converting a data compression ratio with one recording medium.

[0005]

The present invention has the following features in order to solve such a problem. In the following description of the means and the like, a configuration corresponding to the embodiment is exemplified by parentheses as an example. Reference numerals and the like are reference numerals of the attached drawings.

According to a first aspect of the present invention, there is provided a designating means for designating data to be converted from a compression ratio among data recorded on a recording medium and designating a compression ratio of the designated data (for example, FIG. 1 operating unit 3) and data reproducing means (for example, FIG. 1) for reading a part of the data specified by the specifying means and reproducing the read data.
A compression unit (for example, the compression unit 5 in FIG. 1) for compressing data being reproduced by the data reproduction unit at a compression ratio designated by the designation unit; Storage means (for example, RAM 1c in FIG. 1) for temporarily storing data compressed by the above, and recording means (for example, the recording / reproducing unit 4 in FIG. 1) for recording the compressed data stored in the storage means on the recording medium. And characterized in that:

According to the first aspect of the present invention, there is provided designating means for designating data to be converted in compression ratio from data recorded on a recording medium and designating a compression ratio of the designated data. A data reproducing unit that reads a part of the data specified by the specifying unit and reproduces the read data; and compresses the data being reproduced by the data reproducing unit to a compression ratio specified by the specifying unit. A compression unit for compressing the data compressed by the compression unit; a storage unit for temporarily storing data compressed by the compression unit; and a recording unit for recording the compressed data stored in the storage unit on the recording medium. When the data recorded in the compression rate conversion recording is performed, by dividing and compressing the data, a large-capacity memory as a substitute for a recording medium is not required, It is not necessary to prepare another recording medium as come, it is possible to record by converting the compression ratio in one recording medium.

According to a second aspect of the present invention, in the first aspect of the present invention, there is further provided a remaining amount detecting means (for example, a CPU 1a in FIG. 1) for detecting the presence or absence of a remaining capacity of the recording medium. When the detection means detects that the recording medium has a remaining capacity, the recording means records the data compressed by the compression means in a remaining capacity area of the recording medium.

According to the second aspect of the present invention, there is further provided a remaining amount detecting means for detecting the presence or absence of the remaining capacity of the recording medium. When detected, the recording unit records the data compressed by the compression unit in the remaining capacity area of the recording medium, thereby recording the compressed data in the remaining capacity area of the recording medium, The remaining capacity of the recording medium can be effectively used.

According to a third aspect of the present invention, in the first or second aspect of the invention, when the remaining amount detecting means detects that the recording medium has no remaining capacity, the recording medium is subjected to the compression ratio conversion. A notifying unit (for example, the display unit 2 in FIG. 1) for notifying that the state does not return to the state described above, and deleting the compression-converted data part recorded on the recording medium after being notified by the notifying unit. Data deletion means (for example, CPU 1a in FIG. 1) for forming a free area, wherein the recording means records the compressed data in a free area of the recording medium formed by the data deletion means. It is characterized by.

According to the third aspect of the present invention, when the remaining amount detecting means detects that the recording medium has no remaining capacity, it is notified that the recording medium does not return to the state before the compression ratio conversion. A notification unit for notifying, and a data deletion unit for deleting a data portion of the compression ratio converted and recorded on the recording medium to form a free area after being notified by the notification unit, further comprising: Recording the compressed data in the free space of the recording medium formed by the data deleting means, thereby forming a free space when the recording medium has no remaining capacity, thereby enabling effective use of the recording medium. Can be achieved.

According to a fourth aspect of the present invention, in the first aspect of the present invention, all of the specified data is stored in the remaining capacity area detected by the remaining capacity detecting means. When the data is compressed at the set compression rate and recorded by the recording means, a deletion specifying means (for example,
The apparatus further comprises an operation unit 3) shown in FIG.
When data deletion is specified by the deletion specifying means,
All data after the compression ratio conversion recording is deleted, and if the data deletion is not specified, all data before the compression ratio conversion originally recorded on the recording medium are deleted.

According to the fourth aspect of the present invention, in the remaining capacity area detected by the remaining capacity detecting means, all of the specified data is compressed at the specified compression ratio and the recording is performed. Means for specifying whether or not to delete the compression ratio converted recorded data when the data is recorded by the means, wherein the data deleting means comprises: If the data after the compression ratio conversion recording is deleted, and the data deletion is not specified, the data before the compression ratio conversion originally recorded on the recording medium is deleted, thereby specifying the data to be subjected to the compression ratio conversion. Even if erroneous, the data can be restored to the data before the compression ratio conversion.

According to a fifth aspect of the present invention, in the third aspect of the present invention, all of the specified data is compressed at the specified compression rate in the remaining capacity area detected by the remaining capacity detecting means. Then, when the data is recorded by the recording means, a deletion designation means (for example, the operation unit 3 in FIG. 1) for designating whether or not to delete the compression ratio converted recorded data.
The data deletion unit further includes: when data deletion is designated by the deletion designation unit, deletes all data after the compression ratio conversion recording, and when the data deletion is not designated, the data is originally recorded on the recording medium. It is characterized in that all the data before the compression ratio conversion is deleted.

According to the fifth aspect of the present invention, in the remaining capacity area detected by the remaining capacity detecting means, all of the specified data is compressed at the specified compression ratio and the recording is performed. Means for specifying whether or not to delete the compression ratio converted recorded data when the data is recorded by the means, wherein the data deleting means comprises: If all data after compression rate conversion recording is deleted and the data deletion is not specified, all data before compression rate conversion originally recorded on the recording medium are deleted, so that the recording medium has no remaining capacity. In this case, whether or not to continue the compression ratio conversion can be specified.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, the configuration will be described.

FIG. 1 is a block diagram showing the main configuration of a data recording / reproducing apparatus to which the present invention is applied. In FIG. 1, a data recording / reproducing apparatus 10 includes a system controller 1, a display unit 2, an operation unit 3, a recording / reproducing unit 4, a compression unit 5, an amplifier circuit 6, and an audio output terminal 7. CPU1a, ROM inside
1b and a RAM 1c.

The CPU (Cent) in the system controller 1
ral Processing Unit) 1a is an operation unit 3 by a user.
With the key operation from, various control programs for the data recording / reproducing device, application programs, and the like stored in the ROM 1b are read and expanded in a program storage area in the RAM 1c, and various processes are executed. Various data are temporarily stored in a work area (data storage area) formed in the RAM 1a.

For example, the CPU 1a, in accordance with the data specified by the user and the compression ratio among various data recorded on the recording medium loaded in the recording / reproducing section 4, converts the specified data into a compression ratio conversion recording process. (See FIG. 2).

The ROM (Read Only Memory) 1b has a CP
Various control programs for the data recording / reproducing device executed by U1a, application programs, and the like are stored.

The RAM (Random Access Memory) 1c is
When the CPU 1a executes various control programs such as the compression ratio conversion recording process, the programs are developed in a program storage area (not shown), and various data generated in these processes are stored in a data storage area (not shown). For example, the data compressed by the compression unit 5 at the compression ratio specified by the user is temporarily stored in the data storage area.

The display unit 2 includes an LCD (Liquid Crystal Dis
play) or the like, and a required display is performed based on the control of the system controller 1. For example, the CPU 1a
Accordingly, when it is detected that the recording medium loaded in the recording / reproducing unit 4 does not have a free area for writing the data whose compression ratio has been converted, it is displayed that the Undo function does not operate. Here, Undo means to invalidate the immediately preceding process and return to the state before the process was performed.

The operation unit 3 has various operation keys such as a reproduction key, a numeric keypad, and a stop key, and outputs an operation signal by a key operation to the system controller 1.

The recording / reproducing unit 4 includes a recording medium (eg, MD)
And a D / A converter (both not shown) for loading a disc medium such as a CD-R or a CD-R).

The recording / reproducing unit 4 specifies a compression ratio conversion by a data specifying signal input from the system controller 1 when reproducing a recording medium loaded in the loading unit in a compression ratio conversion recording process described later. In addition to demodulating a part of the data, the error of the data is detected and corrected using error correction bits, and the reproduced data is output to the compression unit 5.

The recording / reproducing unit 4 modulates the compressed data input from the system controller 1 by adding an error correction bit thereto, and records the modulated compressed data in a free area of a recording medium.

The D / A converter converts the demodulated digital audio signal into an analog audio signal when reproducing the recording medium.

The compression section 5 compresses the reproduction data input from the recording / reproduction section 4 according to a compression ratio designation signal input from the system controller 1 by a predetermined compression method. The amplifier circuit 6 amplifies the reproduced audio signal input from the recording / reproducing unit 4 and outputs the amplified signal to the audio output terminal 7.

The audio output terminal 7 is connected to a headphone or a speaker and outputs the reproduced audio signal amplified by the amplifier circuit 6 to the outside.

Next, the operation of this embodiment will be described. Hereinafter, the compression ratio conversion recording process for the data recorded on the recording medium will be described with reference to the flowchart of FIG.

The key operation of the operation unit 3 causes the recording / reproducing unit 4 to operate.
When the data for which the compression ratio is to be converted is designated from among various data recorded on the recording medium loaded in the CPU (step S1), the CPU 1a outputs a data designation signal corresponding to the designation to the recording / reproducing unit 4. I do. Next, when the compression ratio of the data is designated by a key operation of the operation unit 3 (step S2), a compression ratio designation signal corresponding to the designation is output to the compression unit 5.

Next, the CPU 1a checks whether or not there is an empty area in the recording medium (step S3). If there is an empty area (step S3; Yes), a part of the data specified in step S1 is determined. Is read from the recording medium and output to the recording / reproducing unit 4 to reproduce the data normally or at high speed (step S4).

The compression section 5 compresses the data being reproduced by the recording / reproduction section 4 by a predetermined compression method at the compression ratio specified in step S2 (step S5), and the CPU 1a compresses the compressed data. It is temporarily stored in the RAM 1c (step S6).

Next, the CPU 1a outputs the compressed data temporarily stored in the RAM 1c to the recording / reproducing unit 4 to record the compressed data in a free area of the recording medium (step S7).
It is checked whether or not all the data specified in step 1 have undergone compression ratio conversion and have been recorded in a free area of the recording medium (step S8).

If all of the designated data has not been converted into a compression ratio and recorded in the free area of the recording medium (step S8; No), the CPU 1a returns to step S3, and again checks whether there is a free area in the recording medium. Check.

When all of the designated data is converted into a compression ratio and recorded in a free area of the recording medium (step S8;
Yes), the CPU 1a prompts the user to determine whether to return the recording medium to the state before the compression ratio conversion (Undo) (Step S9).

When Undo is selected by the key operation of the user (step S9; Yes), the CPU 1a deletes all the data after the compression ratio conversion recorded on the recording medium (step S11). Return to the original state before the compression ratio conversion. If Undo is not selected (Step S9; No),
All the data before compression ratio conversion originally recorded on the recording medium are deleted (step S10), and the compression ratio conversion recording process ends.

If there is no more free space on the recording medium before all the data subjected to the compression ratio conversion is recorded on the recording medium (step S3; No), the CPU 1a displays on the display unit 2 that the Undo function does not operate. (Step S1
2) In the data originally recorded on the recording medium, the part whose compression ratio has been converted is deleted (step S13) to form a free area.

Next, the CPU 1a reads a part of the data designated in step S1 that has not been subjected to the compression ratio conversion from the recording medium, and
To reproduce the data normally or at high speed (step S14).

The compression section 5 compresses the data being reproduced by the recording / reproduction section 4 by a predetermined compression method at the compression ratio specified in step S2 (step S15), and the CPU 1a stores the compressed data in the RAM 1c. (Step S16).

Next, the CPU 1a outputs the compressed data temporarily stored in the RAM 1c to the recording / reproducing unit 4 and records it in an empty area of the recording medium (step S17), and converts all the data specified in step S1 into a compression ratio. Then, it is confirmed whether or not the data is recorded in the free area of the recording medium (step S18).

If all the data specified above have undergone compression ratio conversion and are not recorded in the free area of the recording medium (step S18; No), the CPU 1a proceeds to step S1.
Returning to step 3, if all of the data has been subjected to the compression ratio conversion and has been recorded on the recording medium, the process proceeds to step S10, where all the data before the compression ratio conversion originally recorded on the recording medium are deleted. The conversion recording process ends.

As described above, according to the data recording / reproducing apparatus 10 of the present embodiment, when data recorded on a recording medium is subjected to compression rate conversion recording, the data is divided and recompressed. (Steps S4 and S5 in FIG. 2),
It does not require a large-capacity memory to replace the recording medium and does not require a separate recording medium as in the past, so it is possible to record by converting the compression ratio with one recording medium become.

If all the data after the compression ratio conversion recording can be recorded in the free area of the recording medium (step S8;
Yes), since the original data before the compression ratio conversion remains in the recording medium, the Undo function becomes possible. By using the Undo function, it is possible to return to the original data before the compression ratio conversion, even if the designation of the data to be subjected to the compression ratio conversion is wrong.

The description contents in the present embodiment are as follows.
Changes can be made as appropriate without departing from the spirit of the present invention.
For example, in the present embodiment, even if the recording medium does not have a sufficient free area and the Undo function does not operate, the part of the data originally recorded on the recording medium that has been subjected to the compression ratio conversion is deleted ( In step S13 in FIG. 2, the compression ratio conversion recording process has been continued while expanding the free area, but when the Undo function is inoperable, the user is prompted to determine whether to continue the compression ratio conversion recording process. You can also.

The compression rate conversion recording processing in this case will be described with reference to the flowchart of FIG.

The key operation of the operation unit 3 causes the recording / reproducing unit 4 to operate.
Of the various data recorded on the recording medium loaded in
When the data for which the compression ratio is to be converted is designated (step S2)
1) The CPU 1a outputs a data designation signal corresponding to the designation to the recording / reproducing unit 4. Next, when the compression ratio of the data is designated by a key operation of the operation unit 3 (step S22), a compression ratio designation signal corresponding to the designation is output to the compression unit 5.

Next, the CPU 1a checks whether or not there is an empty area in the recording medium (step S23). If there is an empty area (step S23; Yes), the CPU 1a proceeds to step S21.
A part of the data designated by is read out from the recording medium and output to the recording / reproducing unit 4 to reproduce the data normally or at high speed (step S24).

The compression section 5 compresses the data being reproduced by the recording / reproduction section 4 by a predetermined compression method at the compression ratio specified in step S22 (step S25), and the CPU 1a
Temporarily stores the compressed data in the RAM 1c (step S26).

Next, the CPU 1a outputs the compressed data temporarily stored in the RAM 1c to the recording / reproducing unit 4 and records it in a free area of the recording medium (step S27), and converts all the data specified in step S21 into a compression ratio. Then, it is confirmed whether or not the data is recorded in the free area of the recording medium (step S28).

If all of the designated data has not been converted into a compression ratio and recorded in the free area of the recording medium (step S28; No), the CPU 1a returns to step S23, and determines again whether there is a free area in the recording medium. Check.

When all of the specified data are converted into compression ratios and recorded in the free area of the recording medium (step S2).
8; Yes), the CPU 1a prompts the user to determine whether to return the recording medium to the state before the compression ratio conversion (Undo) (Step S29).

When Undo is selected by the key operation of the user (step S29; Yes), the CPU 1a deletes all the data after the compression ratio conversion recorded on the recording medium (step S30). Return to the original state before the compression ratio conversion. If Undo is not selected (Step S29; N
o), all data before compression ratio conversion originally recorded on the recording medium are deleted (step S39), and the compression ratio conversion recording process ends.

If there is no more free space on the recording medium before all the data subjected to the compression ratio conversion is recorded on the recording medium (step S23; No), the CPU 1a displays on the display unit 2 that the Undo function does not operate. (Step S3
1) The user is prompted to determine whether to continue the compression ratio conversion (step S32).

When the continuation of the compression ratio conversion is selected by the key operation of the user (Step S32; Yes), the CPU 1
a deletes the part of the data originally recorded on the recording medium after the conversion of the compression ratio (step S33), forms an empty area, and selects the end of the conversion of the compression ratio (step S32; No), the compression ratio conversion recording process ends.

Next, the CPU 1a reads a part of the data designated in step S21 that has not been subjected to the compression ratio conversion from the recording medium, outputs the data to the recording / reproducing unit 4, and outputs the data to the normal mode. Or, it is reproduced at high speed (step S34).

The compression section 5 compresses the data being reproduced by the recording / reproduction section 4 by a predetermined compression method at the compression ratio specified in step S22 (step S35), and the CPU 1a stores the compressed data in the RAM 1c. (Step S36).

Next, the CPU 1a outputs the compressed data temporarily stored in the RAM 1c to the recording / reproducing unit 4 and records it in an empty area of the recording medium (step S37), and converts all the data specified in step S21 into a compression ratio. Then, it is confirmed whether or not the data is recorded in the free area of the recording medium (step S38).

If all the data specified above have undergone compression ratio conversion and are not recorded in the free area of the recording medium (step S38; No), the CPU 1a proceeds to step S3.
Returning to step 3, if all of the data has been subjected to the compression ratio conversion and recorded on the recording medium, the process proceeds to step S39, where all the data before the compression ratio conversion originally recorded on the recording medium are deleted. The conversion recording process ends.

According to the data recording / reproducing apparatus 10 in the embodiment of FIG. 3, when the Undo function is inoperable, the user is asked to confirm whether or not to continue the compression rate conversion recording processing (step S32), thereby recording the data. The convenience of the playback device 10 can be improved.

[0061]

According to the data recording / reproducing apparatus according to the first aspect of the present invention, when data recorded on a recording medium is subjected to compression rate conversion recording, the data is divided and compressed.
It does not require a large-capacity memory as a substitute for a recording medium, and it is not necessary to prepare another recording medium as in the past, so it is possible to record by converting the compression ratio with one recording medium. Become.

According to the data recording / reproducing apparatus according to the second and third aspects of the invention, in addition to the effects of the first aspect,
By recording the compressed data in the remaining capacity area of the recording medium, the remaining capacity of the recording medium can be effectively used.

According to the data recording / reproducing apparatus of the fourth aspect of the present invention, in addition to the effect of the first aspect of the present invention, even if the specification of data to be subjected to compression ratio conversion is wrong, etc. , The data before the compression ratio conversion can be restored.

According to the data recording / reproducing apparatus of the fifth aspect of the present invention, in addition to the effect of the third aspect of the present invention, when the recording medium has no remaining capacity, whether or not to continue the compression rate conversion is designated. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an internal configuration of a data recording / reproducing device 10 to which the present invention is applied.

FIG. 2 is a flowchart showing a compression rate conversion recording process in the embodiment to which the present invention is applied.

FIG. 3 is a flowchart showing a compression rate conversion recording process in a modification of the embodiment to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 System controller 1a CPU 1b ROM 1c RAM 2 Display part 3 Operation part 4 Recording / reproducing part 5 Compression part 6 Amplification circuit 7 Audio output terminal 10 Data recording / reproducing apparatus

Claims (5)

[Claims] 1. Designating means for designating data to be converted in compression rate from data recorded on a recording medium, and designating a compression rate of the designated data, and data designated by the designating means. A data reproducing unit that reads a part of the data and reproduces the read data; a compressing unit that compresses data being reproduced by the data reproducing unit at a compression ratio specified by the specifying unit; A data recording / reproducing apparatus, comprising: storage means for temporarily storing data compressed by the means; and recording means for recording the compressed data stored in the storage means on the recording medium. 2. The apparatus according to claim 1, further comprising: a remaining amount detecting unit configured to detect presence or absence of a remaining capacity of the recording medium. 2. The data recording / reproducing apparatus according to claim 1, wherein data compressed by said compression means is recorded in a remaining capacity area of said recording medium. 3. A notifying means for notifying that the recording medium does not return to a state before compression ratio conversion when the remaining capacity detecting means detects that the recording medium has no remaining capacity, and the notifying means. And a data deletion unit that deletes the data portion of the compression ratio converted and recorded on the recording medium to form a free area after the notification by the recording unit. The recording unit is formed by the data deletion unit. 3. The data recording / reproducing apparatus according to claim 1, wherein the compressed data is recorded in a free area of the recording medium. 4. When all of said specified data is compressed at said specified compression rate in said remaining capacity area detected by said remaining capacity detecting means and recorded by said recording means, The apparatus further comprises a deletion designating means for designating whether or not to delete the rate conversion recorded data. When the data deletion is designated by the deletion designating means, the data deletion means deletes all the data after the compression rate conversion recording. 4. The data recording / reproducing apparatus according to claim 1, wherein all data before compression ratio conversion originally recorded on the recording medium is deleted when the data is deleted and the data deletion is not specified. . 5. A continuation designating means for designating whether or not to continue the compression rate conversion recording after being notified by the notifying means, wherein a continuation of the compression rate conversion recording is designated by the continuation designating means. 4. The data recording / reproducing apparatus according to claim 3, wherein the data deleting unit deletes a data portion of the data recorded on the recording medium after the compression ratio conversion, and forms an empty area on the recording medium.