JP2002111507A - Compressed data recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which a head part of data is lost or foreign noises are produced when data regeneration takes place, because the head part of the latter half of data is lost after the compressed data have been divided, when compressed data in which the data corresponding to a header are present in the front of the header of a frame are divided by frame units. SOLUTION: A compressed data recording device is provided with a recording medium 1 which records compressed record data and a control means 3, which successively records the inputted compressed data in the recording medium 1 and gives the head data of the latter half to the head of the latter half, after a dividing operation is carried out; and when the compressed data are divided, with which a head part being cut off or external noises being produced can be prevented, when the divided compressed data recorded in the recording medium 1 are reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressed data recording apparatus for recording compressed data such as audio data on a recording medium such as a semiconductor memory.

[0002]

2. Description of the Related Art At present, as an audio recording device for recording and reproducing compressed digital audio data, for example, an MD (mini disk) or a device using a semiconductor memory as a recording medium has been commercialized. As a feature of these compressed data recording devices, since they are space-saving, light-weight, and can have a large recording capacity, they are expected to become particularly popular as portable devices in the future.

[0003] Such a conventional compressed data recording apparatus will be described below with reference to the drawings. FIG. 9 is a block diagram of a conventional compressed data recording device, and shows a recording medium 1.
FIG. 10 shows a layout diagram of the compressed data recorded in.

In FIG. 9, 1 is a recording medium such as a semiconductor memory, 2 is a data compression means for sequentially compressing input digital audio data and outputting it as recording data;
Is a control unit for temporarily storing sequentially input recording data in the memory unit 7 and recording the recording data temporarily stored in the memory unit 7 on the recording medium 1.

[0005] When digital audio data is input, the data compression means 2 sequentially outputs the results of the compression processing to the control means 8 as recording data. This compression processing is performed, for example, by ATRAC used for an MD (mini disc).
However, any compression method is not particularly limited.

For example, as shown in FIG. 10A, recording data is divided into frames by a header and side information, and a start pointer stored in the side information corresponds to a frame indicated by the header. The start position of the compressed data is shown.

Next, the control means 8 temporarily stores the recording data to be sequentially inputted in the memory means 7 and transfers the recording data stored in the memory means 7 to the recording medium 1 for every fixed amount of data including, for example, a frame unit or a plurality of frames. Record sequentially.

[0008]

However, in the conventional compressed data recording apparatus as described above, division recording or DIVIDE
When editing or the like is performed, for example, as shown in FIG. 10A, if data corresponding to the header exists before the header of the frame as shown in FIG. 10A, the recording data is divided at the division points shown in FIG. The compressed data corresponding to the head of the latter half is lost in the latter half of the divided recording data as shown in FIG. For this reason, when the divided recording data is reproduced, there is a problem that an abnormal sound is generated or a head frame cannot be reproduced.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. Even when reproducing recorded data divided and recorded, recording data that does not generate abnormal noise or interrupt sound is recorded on a recording medium. Provided is a compressed data recording device capable of recording.

[0010]

According to the present invention, there is provided a compressed data recording apparatus comprising: a recording medium for recording compressed data; a recording medium for sequentially recording input compressed data on the recording medium; When the data is divided, control means is provided for adding the head data of the latter half to the head of the latter half after the division. Thus, when reproducing the divided compressed data recorded on the recording medium, the reproduction can be performed without occurrence of a truncation or abnormal noise.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first invention of the present invention relates to compressed data in which data corresponding to a header exists before a header of a frame, a recording medium for recording the compressed data, and compressed data to be sequentially input. Control means for recording on a recording medium, the control means, when dividing the compressed data in units of frames, in order to add the compressed data corresponding to the header of the first frame of the second half after the division to the top of the second half, The compressed data can be divided without recording unnecessary data.

According to a second aspect of the present invention, there is provided a compressed data in which data corresponding to a header exists before a header of a frame, a recording medium for recording the compressed data, and a compressed medium for sequentially inputting the compressed data. Control means for recording the compressed data in units of frames, and the control means adds a frame including compressed data corresponding to the header of the first frame of the latter half of the divided half to the beginning of the latter half. Has the effect that division can be performed with a processing load of only copying a frame.

According to a third aspect of the present invention, there is provided a compressed data in which data corresponding to a header exists before a header of a frame, a recording medium for recording the compressed data, and a compressed medium for sequentially inputting the compressed data. When the compressed data is divided in frame units, the control means stores the front frame storing the compressed data corresponding to the header of the first frame of the second half after the division into the first half of the second half. Is written to the unnecessary portion of the compressed data in the front frame, so that silence can be reliably avoided when reproducing the compressed data in the second half. .

According to a fourth aspect of the present invention, there is provided a compressed data in which data corresponding to a header is present before a header of a frame, a recording medium for recording the compressed data, and a compressed medium for sequentially inputting the compressed data. When the compressed data is divided in frame units, the control means stores the front frame storing the compressed data corresponding to the header of the first frame of the second half after the division into the first half of the second half. Is added to the header and data that invalidates the unnecessary part of the compressed data in the front frame is written in the header. Therefore, even if an attempt is made to reproduce the unnecessary part of the compressed data during reproduction, a reproduction error occurs. This has the effect that unnecessary data reproduction can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a compressed data recording apparatus according to Embodiment 1 of the present invention. FIG. 5 shows a layout diagram of the compressed data recorded on the recording medium according to the first embodiment of the present invention.

In FIG. 1, 1 is a recording medium such as a semiconductor memory, 2 is a data compression means for sequentially compressing input digital audio data and outputting it as recorded data, 3
Is first control means for temporarily storing recording data sequentially inputted in the memory means 7 and for recording the recording data temporarily stored in the memory means 7 on the recording medium 1.

First, when digital audio data is input, the data compression means 2 sequentially outputs the result of the compression processing to the first control means 3 as recording data. This compression processing is not particularly limited to any compression method as in the past.

This recording data is divided for each frame by a header and side information, for example, as shown in FIG. 5A, and the Start Pointer stored in the side information.
Indicates the start position of the compressed data corresponding to the frame indicated by the header.

Next, the first control means 3 temporarily stores the sequentially input recording data in the memory means 7, and sequentially records the recording data stored in the memory means 7 on the recording medium 1.

Here, a case where division recording or DIVIDE editing is performed, for example, a case where a division point shown in FIG. First, the first control unit 3 first performs recording on the recording medium 1 with the recording data up to the division point temporarily stored in the memory unit 7 as the first half, and saves the division point as the end position of the first half.

Next, the first control means 3 starts the Start Po stored in the side information written in the frame of the division point.
The inter is read to search for the head position of the recording data corresponding to the frame of the division point. Further, the first control means 3 uses the recording data indicated by the Start Pointer as the head position of the second half, and stores the recording data up to the division point in the memory means 7.
The recording data after the division point is sequentially recorded on the recording medium 1 while the recording data is kept.

The recording data of the latter half divided in this way is recorded on the recording medium 1 with the layout shown in FIG. 5B, and the recording data from the beginning of the latter half to the division point, that is, the starting position of the latter half is dummy. This is recorded at the head of the divided frame as a frame.

On the other hand, when the compressed data recorded on the recording medium 1 is to be reproduced, the header is first searched in order from the first frame, and the compressed data is reproduced from the Start Point stored in the side information written in the header of the first frame. Start.
In this case, since the side information indicates a position where no data exists, a reproduction error occurs and no abnormal noise occurs,
Next, the reproduction can be started from the compressed data corresponding to the header of the frame corresponding to the division point, that is, the head of the latter half. In the present embodiment, the end position of the recording data is saved, but it is needless to say that this information may be recorded on the recording medium 1. In this embodiment, the dummy frame is used. However, this period may be saved as an offset, and at the time of reproduction, the reproduction may be started by searching from the header of the frame whose offset has advanced.

As described above, according to the first embodiment of the present invention, when the compressed data is divided and recorded on the recording medium, the divided second half of the recording data corresponds to the first frame of the second half. Since the recording data to be recorded is added to the beginning of the second half and then recorded on the recording medium, it is possible to prevent the occurrence of truncation or abnormal noise during reproduction without adding unnecessary data.

(Embodiment 2) FIG. 2 is a block diagram showing a compressed data recording apparatus according to Embodiment 2 of the present invention. FIG. 6 shows a layout diagram of compressed data recorded on a recording medium according to the second embodiment of the present invention.

In FIG. 2, 1 is a recording medium such as a semiconductor memory, 2 is a data compression means for sequentially compressing input digital audio data and outputting it as recording data.
Is second control means for temporarily storing recording data sequentially inputted in the memory means 7 and for recording the recording data temporarily stored in the memory means 7 on the recording medium 1.

First, when digital audio data is input, the data compression means 2 sequentially outputs the result of the compression processing to the second control means 4 as recording data. This compression processing is not particularly limited to any compression method as in the past.

As shown in FIG. 6A, the recording data is divided for each frame by a header and side information, and the Start Pointer stored in the side information.
Indicates the start position of the compressed data corresponding to the frame indicated by the header. Next, the second control means 4 temporarily stores the sequentially input recording data in the memory means 7,
The recording data stored in the memory means 7 is sequentially recorded on the recording medium 1 for each frame, for example.

Here, a case where division recording or DIVIDE editing is performed, for example, a case where a division point shown in FIG. First, the second control means 4
The recording data up to the division point temporarily stored in the memory means 7 is recorded on the recording medium 1 as, for example, a frame in the first half, and the division point is saved as the end position of the first half.

Next, the second control means 4 starts the Po Po stored in the side information written in the frame of the division point.
The inter is read to search for the head position of the recording data corresponding to the frame of the division point. Further, the second control means 4 searches for the beginning of the frame including the recording data indicated by the Start Pointer, that is, the header position, and leaves the recording data up to the division point in the memory means 7 with the beginning of the frame as the beginning position of the latter half. The recording data subsequent to the division point is sequentially recorded on the recording medium 1 in, for example, a frame unit, and the division point is saved as an offset from the head position of the recording data in the second half. This offset may be, for example, the number of frames from the head position or the byte of the recording data. The recording data of the latter half divided in this manner is recorded on the recording medium 1 in the layout shown in FIG.
And the frame from the first frame of the second half to the division point, that is, the start position of the second half, is recorded at the top of the divided frame.

On the other hand, when the compressed data recorded on the recording medium 1 is reproduced, first, a desired header is read from the offset saved from the head of the compressed data, that is, a position advanced by the division point at the time of recording, and the frame is read. By reading out the compressed data from the position indicated by the Start Pointer stored in the side information written in the side information described above, the reproduction can be started from the beginning of the latter half divided at the time of recording. In this embodiment, the end position and the offset of the recording data are saved, but it is needless to say that such information may be recorded on the recording medium 1. Further, in the present embodiment, the recording data is recorded on the recording medium 1 in units of one frame, but the recording is not limited to a plurality of frames or a fixed amount of data including a plurality of frames.

As described above, according to the second embodiment of the present invention, when the compressed data is divided and recorded on the recording medium, the divided second half of the recording data corresponds to the first frame of the second half. The frame that contains the recording data to be recorded is copied to the beginning of the second half and then recorded on the recording medium, so that it is possible to prevent the occurrence of truncation and abnormal noise during playback without increasing the processing load. it can.

(Embodiment 3) FIG. 3 is a block diagram showing a compressed data recording apparatus according to Embodiment 3 of the present invention. FIG. 7 is a layout diagram of compressed data recorded on a recording medium according to the third embodiment of the present invention.

In FIG. 3, 1 is a recording medium such as a semiconductor memory, 2 is a data compression means for sequentially compressing input digital audio data and outputting it as recording data.
Is a third control means for temporarily storing the recording data sequentially inputted in the memory means 7 and for recording the recording data temporarily stored in the memory means 7 on the recording medium 1.

First, when digital audio data is input, the data compression means 2 sequentially outputs the result of the compression processing to the third control means 5 as recording data. This compression processing is not particularly limited to any compression method as in the past.

This recording data is divided for each frame by a header and side information as shown in FIG. 7A, for example, and the Start Pointer stored in the side information.
Indicates the start position of the compressed data corresponding to the frame indicated by the header. Next, the third control means 5 temporarily stores the sequentially input recording data in the memory means 7,
The recording data stored in the memory means 7 is sequentially recorded on the recording medium 1 for each frame, for example.

Here, a case where division recording or DIVIDE editing is performed, for example, a case where a division point shown in FIG. First, the third control means 5 performs recording on the recording medium 1 in, for example, a frame unit using the recording data up to the division point temporarily stored in the memory means 7 as the first half, and sets the division point to the recording data of the first half. Save as the end position.

Next, the third control means 5 starts the Start Po stored in the side information written in the frame of the division point.
The inter is read to search for the head position of the recording data corresponding to the frame of the division point. Further, the third control means 5 searches the head of the frame including the recording data indicated by the Start Pointer, that is, the header position, and leaves the recording data up to the division point in the memory means 7 with the head of the frame as the head position of the latter half. After rewriting the unnecessary part of the data in the frame at the head position, that is, the final data of the first half part, to mute data that makes no sound such as zero, for example, according to the side information written in the header of the frame corresponding to the head position of the latter part. The recording data after the division point is sequentially recorded on the recording medium 1 in, for example, a frame unit, and the Start Pointer of the side information indicated by the first header of the second half is rewritten to the beginning of an unnecessary portion. Rewriting of side information is performed for all headers existing up to the division point. The recording data of the latter half part thus divided is shown in FIG.
The data is recorded on the recording medium 1 in the layout shown in (b), and is recorded at the beginning of the divided frame as a frame including the recording data from the beginning frame of the latter half to the division point as a dummy frame.

On the other hand, when the compressed data recorded on the recording medium 1 is reproduced, first, the header corresponding to the first frame of the second half is read out and the position indicated by the Start Pointer stored in the side information written in the frame is read. By reading out the compressed data, the reproduction can be started from the head of the latter half divided at the time of recording. At this time, if playback starts from the first frame of the second half, the compressed data corresponding to the first frame is zero data, so it is muted without generating abnormal noise, and zero data is reproduced to the division point position during recording Will be done. In the present embodiment, the end position of the recording data is saved, but it is needless to say that this information may be recorded on the recording medium 1. Further, in the present embodiment, the recording data is
Although recording is performed in frame units, recording in a plurality of frames or in a fixed data amount including a plurality of frames is not limited at all.

As described above, according to the third embodiment of the present invention, when the compressed data is divided and recorded on the recording medium, the divided second half of the recording data corresponds to the first frame of the second half. A frame containing recording data to be added is added to the beginning of the latter half, and unnecessary data in the added frame is rewritten to null data (Null Data) for silence and then recorded on a recording medium. Therefore, at the time of reproduction, generation of abnormal noise due to unnecessary data can be reliably prevented even if reproduction is started from the first frame of the latter half.

(Embodiment 4) FIG. 4 is a block diagram showing a compressed data recording apparatus according to Embodiment 4 of the present invention. FIG. 8 shows a layout diagram of compressed data recorded on a recording medium according to Embodiment 3 of the present invention.

In FIG. 4, 1 is a recording medium such as a semiconductor memory, 2 is a data compression means for sequentially compressing input digital audio data and outputting it as recording data;
Is a fourth control means for temporarily storing recording data sequentially inputted in the memory means 7 and for recording the recording data temporarily stored in the memory means 7 on the recording medium 1.

First, when digital audio data is input, the data compression means 2 sequentially outputs the result of the compression processing to the fourth control means 6 as recording data. This compression processing is not particularly limited to any compression method as in the past.

This recording data is divided for each frame by a header and side information as shown in FIG. 8A, for example, and the Start Pointer stored in the side information.
Indicates the start position of the compressed data corresponding to the frame indicated by the header. Next, the fourth control means 6 temporarily stores the sequentially input recording data in the memory means 7,
The recording data stored in the memory means 7 is sequentially recorded on the recording medium 1 for each frame, for example.

Here, a case where division recording or DIVIDE editing is performed, for example, a case where a division point shown in FIG. First, the fourth control means 6 first performs recording on the recording medium 1 in, for example, a frame unit using the recording data up to the division point temporarily stored in the memory means 7 as the first half, and sets the division point to the recording data of the first half. Save as the end position.

Next, the fourth control means 6 starts the Po Po stored in the side information written in the frame of the division point.
The inter is read to search for the head position of the recording data corresponding to the frame of the division point. Further, the fourth control means 6 searches the head of the frame including the recording data indicated by the Start Pointer, that is, the header position, and leaves the recording data up to the division point in the memory means 7 with the head of the frame as the head position of the latter half. First, according to the side information written in the header of the frame corresponding to the head position of the second half, the side information indicating an unnecessary portion, that is, the last data of the first half of the data within the frame at the first position is, for example, a negative value or the like. Forcibly rewrite to a position where no data exists. After rewriting this operation for all headers existing up to the division point, the recording data after the division point is sequentially recorded on the recording medium 1 in, for example, frame units. The recording data of the latter half divided in this manner is recorded on the recording medium 1 in the layout shown in FIG. 8B, and a frame including the recording data from the first frame of the latter half to the division point is set as a dummy frame after the division. It will be recorded at the beginning of the frame.

On the other hand, when the compressed data recorded on the recording medium 1 is reproduced, first, the header corresponding to the first frame of the second half is read out, and from the position indicated by the Start Pointer stored in the side information written in the frame. By reading out the compressed data, the reproduction can be started from the head of the latter half divided at the time of recording. At this time, if the reproduction is started from the first frame of the latter half, the side information of the first frame indicates a position where no data exists, so that a reproduction error occurs, and unnecessary compressed data is not necessarily reproduced. Reproduction can be normally performed from the division point position.

In this embodiment, the end position of the recording data is saved, but it is needless to say that this information may be recorded on the recording medium 1. In this embodiment, the recording data is recorded on the recording medium 1 in units of one frame. However, the recording is not limited to a plurality of frames or a fixed amount of data including a plurality of frames. Further, in the present embodiment, only the recording data division at the time of recording has been described. However, even when the compressed data recorded on the recording medium is divided (Divide) by the editing or the like, the same processing is performed on the compressed data in the latter half of the divided data. It can be realized by doing.

As described above, according to the fourth embodiment of the present invention, when the compressed data is divided and recorded on the recording medium, the divided second half of the recording data corresponds to the first frame of the second half. Add the frame containing the recording data to be added to the beginning of the second half, and rewrite the side information written in the header corresponding to the first frame to a negative value to invalidate unnecessary data in the added frame. After that, recording on the recording medium is performed, so that at the time of reproduction, a reproduction error can be reliably generated in the first frame of the second half part, and unnecessary reproduction of compressed data can be prevented.

[0051]

As described above, according to the first aspect of the present invention, the control means receives compressed data such as audio sequentially compressed by the data compression means as input, and controls the compressed data temporarily stored in the memory means. Since the compressed data is divided at the division point and the compressed data corresponding to the first frame of the second half is added to the first frame of the second half with respect to the compressed data of the second half, the compressed data is sequentially recorded on the recording medium. It is possible to prevent the occurrence of a truncation or an abnormal sound during reproduction without giving it to the beginning.

According to the second aspect of the present invention, the compressed data such as audio data sequentially compressed by the data compression means is input, and the control means compresses the compressed data at the division points of the compressed data temporarily stored in the memory means. After dividing the data and adding the frame including the compressed data corresponding to the first frame of the second half to the first frame of the second half, the data is sequentially recorded on the recording medium and divided from the top of the second half. The start position of the latter half of the compressed data is saved as an offset up to the point, and the compressed data is reproduced from the header of the frame indicated by the offset at the time of reproduction, so that the occurrence of truncation or abnormal noise at the time of reproduction can be prevented. .

According to the third aspect of the present invention, the compressed data such as audio data sequentially compressed by the data compression means is input, and the control means compresses the compressed data at the division points of the compressed data temporarily stored in the memory means. The data is divided and a frame including compressed data corresponding to the first frame of the second half is added to the first frame of the second half with respect to the compressed data of the second half, and unnecessary compressed data of the first frame is forcibly silenced. After rewriting the compressed data in the second half, the recorded information is sequentially recorded on the recording medium, and the side information written in the header of the first frame of the second half is rewritten to the start position of the unnecessary compressed data. Generation of abnormal noise can be prevented.

According to the fourth aspect of the present invention, the compressed data such as audio data sequentially compressed by the data compression means is input, and the control means compresses the compressed data at the division points of the compressed data temporarily stored in the memory means. Data is divided and a frame including compressed data corresponding to the first frame of the second half is added to the first frame of the second half with respect to the compressed data of the second half, and unnecessary data of the first frame is forcibly invalidated. Therefore, the side information written in the header corresponding to the frame from the first frame to the division point is rewritten to a position where no data exists, and then sequentially recorded on the recording medium. Even in this case, it is possible to reliably generate a reproduction error and prevent unnecessary data from being reproduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a compressed data recording device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a compressed data recording device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a compressed data recording device according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a compressed data recording device according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a layout of compressed data recorded on a recording medium according to the first embodiment of the present invention;

FIG. 6 is a diagram showing a layout of compressed data recorded on a recording medium according to a second embodiment of the present invention;

FIG. 7 is a diagram showing a layout of compressed data recorded on a recording medium according to a third embodiment of the present invention;

FIG. 8 is a diagram showing a layout of compressed data recorded on a recording medium according to a fourth embodiment of the present invention.

FIG. 9 is a block diagram showing a configuration of a conventional compressed data recording device.

FIG. 10 is a diagram showing a layout of compressed data recorded on a recording medium by a conventional compressed data recording device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording medium 2 Data compression means 3 1st control means 4 2nd control means 5 3rd control means 6 4th control means 7 Image processing part 8 5th control means

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Tomoaki Izumi 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. F term (reference) 5J064 AA01 BA15 BC01 BC02 BD03

Claims (4)

[Claims] 1. A system comprising: compressed data in which data corresponding to a header exists before a header of a frame; a recording medium for recording the compressed data; and control means for recording the sequentially input compressed data on the recording medium. The compressed data recording apparatus, when the control means divides the compressed data into frames, adds compressed data corresponding to the header of the first frame of the latter half of the divided part to the beginning of the latter half. . 2. The control means, when dividing the compressed data in frame units, assigns a frame including compressed data corresponding to a header of a leading frame of the latter half of the divided part to the beginning of the latter half. The compressed data recording device according to claim 1, wherein: 3. The control means, when dividing the compressed data on a frame-by-frame basis, assigns a front frame storing compressed data corresponding to a header of a leading frame of the latter half of the divided second part to a leading part of the latter half. 2. A compressed data recording apparatus according to claim 1, further comprising: writing data for silence in unnecessary portions of the compressed data in the front frame. 4. The control means, when dividing the compressed data in frame units, converts a front frame storing compressed data corresponding to a header of a first frame of the second half of the divided second part into a first part of the second half. 2. A method of writing, in a header, data added to the header and invalidating reproduction of an unnecessary part of the compressed data in the front frame.
The compressed data recording device as described in the above.