JP2005317107A - Data processing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data processing program capable of executing the reproduction process using these data while suppressing a CPU load when a high speed ripping of the information data is carried out from an external memory such as a disk-like recording medium. <P>SOLUTION: A thread T1 of storage means function for storing the data stored in the disk-like medium 10 to a storage device 13, a thread T2 of compression means function for compressing the data stored in the storage device 13 by the storage means, and a thread T4 of reproduction means function for reproducing the data stored in the storage device 13 when the compression is performed by the compression means, are executed by a computer, thereby the computer functions as these means. An adoption of a thread T5 is preferable, which exerts the function of the reproduction means for reproducing the data compressed by the compression means when the data compression performed by the compression means is completed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a data processing program, and more particularly to a data processing program suitable for use in an apparatus for storing and reproducing information read from a medium disk or the like, and further to an effective data processing program for use in a navigation system.

  A conventional data processing program of this type is known as a control program for a recording / playback apparatus as shown in FIG. 4 (see, for example, Patent Document 1). In addition to the pickup 31, this apparatus has an analog / digital converter (hereinafter simply referred to as an AD converter) 33, a compression circuit 34, a recording buffer memory 35, an encoder 36 and a recording circuit 37 as components constituting the information recording unit. The information reproduction unit includes a reproduction circuit 38, a decoder 39, a reproduction buffer memory 40, a decompression circuit 41, and a digital / analog converter (hereinafter simply referred to as a DA converter) 42, and further includes a CPU 43 for controlling them. I have.

  Input data Sin from the outside is converted into a digital signal by the AD converter 33, compressed by the compression circuit 34, and temporarily stored in the recording buffer memory 35. The accumulated data is compressed and encoded by the encoder 36 and sent to the recording circuit 37 as encoded information. In the recording circuit 37, the encoded information is written to the medium disk 30 in accordance with a predetermined write control signal from the CPU 43.

Information recorded on the medium disk 30 is read into the reproduction circuit 38 via the pickup 31, decoded by the decoder 39, temporarily stored in the reproduction buffer memory 40, and sequentially taken into the expansion circuit 41 for expansion. The analog signal is output from the DA converter 42.
JP-A-11-273246

  In the conventional data processing program for recording and reproducing as described above, during the data encoding process for ripping the music information on the medium disk 30, especially for reading the medium disk 30 at high speed, or on the medium disk 30. There is a problem that it is not possible to reproduce an arbitrary music piece because it is necessary to expand the music information.

  In addition, during high-speed ripping, the load on the CPU (Central Processing Unit) increases, and there are cases where virtually no other operations can be performed.

  The present invention has been made to solve the conventional problems. When information data is ripped at high speed from an external memory such as a disk-shaped recording medium, the reproduction process using the data is executed while suppressing the CPU load. An object of the present invention is to provide a data processing program that can be used.

  In order to achieve the above object, a data processing apparatus according to the present invention includes a storage unit that stores data stored in an external memory in a storage device, and a compression that compresses the data stored in the storage device by the storage unit. And a means for reproducing data stored in the storage device when the compression means is compressing.

  With this configuration, even when the compression unit is executing the data compression process, the reproduction process by the reproduction unit is performed without performing the decoding process using the data once stored in the read data format in the storage device. Will be able to execute.

  In the data processing program of the present invention, the reproducing means reproduces the data compressed by the compressing means when the data compression by the compressing means is completed.

  With this configuration, it is possible to perform various reproductions using the stored data while performing the decoding process of the compressed data when the encoding process is completed.

  According to the present invention, even when the compression unit is executing the data compression process, the data stored once in the read data format in the storage device is used for the reproduction by the reproduction unit without performing the decoding process. Since output processing can be executed, even when information data is ripped at high speed from an external memory such as a disk-shaped recording medium, reproduction processing using the data can be reliably executed while suppressing the CPU load. A data processing program can be provided.

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

  In this embodiment, the data processing program of the present invention is installed in a recording / reproducing apparatus (hereinafter simply referred to as a recording / reproducing apparatus) of an in-vehicle navigation system.

  As shown schematically in FIG. 1, the recording / reproducing apparatus of the present embodiment reproduces, compresses and stores read data from the disk-shaped recording medium 1 (external memory) and input data from another external memory. A multi-thread processor 11, a first buffer memory 12 accessed by the processor 11, and a second buffer memory 13 accessed by the processor 11 are provided.

  The disc-shaped recording medium 1 is a removable recording medium for storing predetermined data, and is composed of, for example, an optically readable CD (Compact Disc), a DVD (Digital Versatile Disc), or other optical disks. The data recorded on the disc-shaped recording medium 1 is PCM (Pulse Code Modulation) digital audio data such as CD-DA (Compact Disc Digital Audio), but may be MP3 (MPeg audio layer 3) compressed data. The image data may be included and is not particularly limited. Further, the disc-shaped recording medium 1 is not limited to an optical disc, and an attaching / detaching method in which the transfer rate of read data must be slower than either the first buffer memory 12 or the second buffer memory 13 ( It is a removable data recording medium.

  Data recorded on the disk-shaped recording medium 1 is read by a CD / DVD deck or other disk drive 10 and transferred and output at a predetermined data transfer speed. That is, the disk drive 10 is a means for inputting and transferring data from an external memory. The disc drive 10 is capable of not only reproducing data recorded on a disc-shaped recording medium 1 such as a CD or a DVD, but also writing data on a disc-shaped recording medium 1 of a predetermined format such as a write-once type or a rewritable type. is there.

  The processor 11 has a microcomputer configuration including a CPU, a memory, and an interface. In processing the data, the processor 11 exchanges data to be processed with the first buffer memory 12 and the second buffer memory 13. The disk drive 10 is also made to execute a direct memory access type data transfer process (hereinafter simply referred to as DMA transfer).

  The first buffer memory 12 stores data used for data processing in the processor 11 in a readable manner, and exchanges data with the processor 11 being processed. The first buffer memory 12 is composed of a semiconductor memory element that functions as a high-speed buffer memory having a data storage capacity of, for example, about 2 megabytes.

  The processor 11 corresponds to the reproduction request input, and the first storage area (the LBA area in FIG. 1) of the second buffer memory 13 in the data format at the time of reading that can normally reproduce the read data, for example, the PCM digital audio data format. Read function thread T1 serving as a storage means for temporarily storing data, and an encode function thread serving as a compression means for performing compression encoding processing of read data corresponding to a recording request input, for example, AAC (Advanced Audio Coding) encoding processing T2 and an accumulation recording function thread for recording and recording the encoded data as a music data file for one song, for example, in the second storage area (FAT area in FIG. 1) of the second buffer memory 13 T3 and temporarily stored in the second buffer memory 13 for the playback request input First reproduction function thread T4 as reproduction means for reproducing and outputting sound based on stored data, for example, PCM digital audio data, and data that has been encoded and accumulated and recorded in the FAT area of the second buffer memory 13, for example, one song And a decoding function thread T5 as a reproducing means after completion of compression for decoding and reproducibly decoding the AAC data file, and further updating a plurality of other threads T6, for example, vehicle position information on the navigation map Threads for search processing, video playback, human machine interface (hereinafter referred to as HMI) operations, and the like can be executed.

  The LBA (Logical Block Addressing) area of the second buffer memory 13 is a first storage area from which recorded information can be quickly read out by logical block address management. The FAT (File) of the second buffer memory 13 The Allocation Table) area is a second storage area that records and saves file information in a predetermined file format that is handled by one or more predetermined operating systems (OS).

  More specifically, for example, as shown in FIG. 2, the second buffer memory 13 includes a read-only first LBA area A1, a map data FAT area A2, a music data TFAT (Transaction-safe FAT) area A3, It has an FAT area A4 for HMI data and a work area A5 which is a ripping PCM data storage area. In the TFAT area, encoded AAC data is recorded so as to be readable in the file format of the TFAT file system. The TFAT file system is intended to prevent the loss of transaction data on a memory card or hard disk when the power supply is reduced.

  The speed of data writing and reading, which is the access speed of the second buffer memory 13, is faster than the transfer speed of read data from the disk drive 10 and slower than the data transfer speed of the first buffer memory 12. . The second buffer memory 13 is a storage device having a storage capacity larger than the storage capacity of the first buffer memory 12, and is composed of, for example, a hard disk drive or a memory card having excellent vibration resistance performance.

  Next, referring to FIG. 1 and FIG. 2, a general flow of data related to storage, compression and accumulation recording and reproduction of read data in the recording / reproducing apparatus of the present embodiment will be described.

  The CD-DA data recorded on the disk-shaped recording medium 1 is read by the disk drive 10 equipped with the ATAPI driver in response to a request from the reading function thread T1 (storage means) of the processor 11, for example, from 170 kilobytes to 1. DMA (Direct Memory Access) transfer is output at a predetermined data transfer rate of about 7 megabytes. This data flow is indicated by an arrow da in FIG.

  The read data transferred and output here is, for example, in the second LBA area A5 of the second buffer memory 13 with the data of one track of the recording track on the disk-shaped recording medium 1 (hereinafter referred to as track data) as a writing unit. Written to multiple logical blocks. Such data is written (stored) in the second buffer memory 13 as shown in FIG. 2 by assigning logical block addresses in order of track numbers as indicated by TRK1, TRK2, TRK3,. This is executed for the data of all the recording tracks on one.

  Therefore, after the writing is completed, the processor 11 can immediately read arbitrary track data from the second buffer memory 13 by designating the logical block address in the second LBA area A5.

  Reading stored data from the second buffer memory 13 includes reading data for AAC encoding processing (indicated by an arrow db in FIG. 1) based on logical block address information for each data writing unit, and reading this data. A plurality of read paths called reproduction output (indicated by arrow dc in FIG. 1) for using PCM data of another track different from the inner track for reproduction output are prepared.

  When this stored data is read, AAC encoding processing by the encoding function thread T2 (compression means) of the processor 11 is executed, and AAC data of a predetermined file size is sequentially stored in the second buffer memory 13 by the storage recording function thread T3 of the processor 11. Recording can be performed by accumulation recording (indicated by an arrow de in FIG. 1).

  On the other hand, the first reproduction function thread T4 (reproduction means) of the processor 11 sequentially uses the track data in the PCM data format as it is read and performs PCM reproduction of the desired music piece. Further, the audio data stored in the second buffer memory 13 is appropriately decoded by the second reproduction function thread T5 (reproduction means after completion of compression) of the processor 11 according to the reproduction request input, and the amplifier 15 and the speaker 16 output the reproduced sound.

  Switching between the above-described PCM reproduction and reproduction by AAC decoding is achieved by repeatedly executing a discrimination process as shown in FIG. 3 at a predetermined period.

  In FIG. 3, first, it is checked whether or not there is a recording request based on a user operation (step S1). If there is a request, reading of data from the disk-shaped recording medium 1 is executed by the reading function thread T1 of the processor 11. The read data is stored in the LBA area of the second buffer memory 13 (step S3). Based on the stored data, AAC encoding processing by the encoding function thread T2, that is, compression encoding of the read data is performed, and the compressed data is stored in the FAT of the second buffer memory 13 in units of music by the storage recording function thread T3. Accumulated and recorded in the area in a predetermined file format (step S4).

  If there is no recording request at the time of the previous check (in the case of YES in step S1), or if data compression and recording are started in step S4, then it is determined whether there is a reproduction request based on the user operation. (Step S5). At this time, if there is a reproduction request (YES in step S5), it is checked whether or not the AAC encoding process for data compression is being executed (step S6), and if AAC encoding is in progress (YES in step S6). In this case, the first playback function thread T4 reads PCM audio data from the LBA area of the second buffer memory 13 in a different path from the reading for the AAC encoding process, and outputs playback audio ( Step S7).

  If the AAC encoding process is completed in step S6, the decoding function thread T5, which is a reproducing means after compression completion, performs the decoding process of the compressed data for the music requested to be reproduced, and outputs the reproduced sound (step S6). S8).

  In the data processing program of this embodiment, the processor 11 is stored in the disk-shaped recording medium 1 by causing the processor 11 which is a computer to execute the processes of the threads T1 to T5 as described above. Storage means (thread T1) for storing data in the second buffer memory 13, compression means (thread T2) for compressing data stored in the second buffer memory 13 by the storage means, and compression by the compression means In this case, the data stored in the second buffer memory 13 can be made to function as reproducing means (thread T4).

  Therefore, even during the time when the compression means thread T2 is executing the data compression process, the data stored once in the data format at the time of reading in the second buffer memory 13 is used to perform a decoding process with a large processing load. The reproduction process by the reproduction means thread T4 can be executed without doing this. Further, by controlling the reproduction ratio of the compressed data and the PCM data, it is possible to reduce the CPU load and increase the software encoding processing capability.

  Specifically, for example, PCM playback processing is executed until ripping of all CDs for one CD is completed, and CPU time allocation sufficient for encoding processing can be performed during ripping, so that the ripping speed is improved. be able to. You can also specify and play the next song or all songs even during high-speed ripping. However, when the encoding process is started immediately after ripping of one or more songs, the ripping may be stopped and the reproduction process may be performed.

  Furthermore, in the data processing program of the present invention, when the data compression by the compression means is completed, the reproduction means thread T5 after completion of the compression reproduces the data compressed by the compression means. A variety of reproductions using stored data can be performed by decoding compressed data.

  As described above, the data processing program of the present invention performs the decoding process using the data once stored in the read data format in the storage device even while the compression unit executes the data compression process. Even when information data is ripped at high speed from an external memory such as a disk-shaped recording medium, the reproduction process using the data can be reliably performed while suppressing the CPU load. It has the effect of being able to be executed, and is useful as a data processing program suitable for storing and reproducing information read from a medium disk or the like, and also as an effective data processing program equipped for a navigation system. .

The block diagram which shows schematic structure of the recording / reproducing apparatus of the vehicle-mounted navigation system provided with the data processing program in one embodiment of this invention Explanatory drawing explaining the structure of the storage area of the storage device in one embodiment of this invention The principal part flowchart of the data processing program in one embodiment of this invention Block diagram showing the configuration of a conventional recording / playback apparatus

Explanation of symbols

1 Disc-shaped recording medium 11 Processor (computer)
12 First buffer memory 13 Second buffer memory (storage device)
A1 First read-only LBA area A2 FAT area for map data A3 TFAT (Transaction-safe FAT) area for music data A4 FAT area for HMI data A5 Work area that is a PCM data storage area for ripping

Claims (2)

Computer
Storage means for storing data stored in an external memory in a storage device;
Compression means for compressing data stored in the storage device by the storage means;
A data processing program that functions as a reproducing unit that reproduces data stored in the storage device when the compressing unit compresses the data. The data processing program according to claim 1, wherein the reproduction unit reproduces the data compressed by the compression unit when data compression by the compression unit is completed.

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