WO2005106871A1

WO2005106871A1 - Data processor and data processing program

Info

Publication number: WO2005106871A1
Application number: PCT/JP2005/004603
Authority: WO
Inventors: Takehiko Yasuda; Yoshiteru Adachi; Yuji Kaihotsu
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2004-04-28
Filing date: 2005-03-16
Publication date: 2005-11-10

Abstract

A data processor capable of reproducing information read out from an external memory, e.g. a medium disk uninterruptedly, and a data processing program capable of performing reproduction processing while suppressing the load on a CPU when information data is ripped from the external memory at a high rate. The data processor comprises a processor (11) for processing data from a disk-like recording medium (1), a first buffer memory (12) for storing the processed data, and a second buffer memory (LBA area) being accessed at a rate higher than that for the recording medium (1) but lower than that for the memory (12). The data processing program executes the thread T1 of a storage means function for storing data stored on a disk-like medium (10) into a storage device (FAT area), the thread T2 of a compression means function for compressing the stored data, and the thread T4 of a reproduction means function for reproducing the data stored in the device (13) when the compression means is compressing the data.

Description

Specification

Data processing apparatus and data processing program

Technical field

The present invention relates to a data processing apparatus and a data processing program, and more particularly, to a data processing apparatus suitable as an accumulation and reproduction apparatus for information read from a medium disk or the like, and further to a navigation system for effective data processing. The present invention relates to an apparatus, a data processing program suitable for being installed in an accumulation and reproduction apparatus of information read from a medium disk or the like, and further an effective data processing program for being equipped in a navigation system.

Background art

A conventional data processing apparatus and data processing program of this type are known as, for example, a recording and reproducing apparatus as shown in FIG. 4 and a control program thereof (see, for example, Patent Document 1). This device has, in addition to a pickup 31, 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 an information recording unit. As components constituting an information reproducing unit, a reproduction circuit 38, a decoder 39, a reproduction buffer memory 40, an expansion circuit 41, and a digital-to-analog converter (hereinafter simply referred to as a DA converter) 42 To prepare.

The external input data Sin is converted to a digital signal by the AD converter 33, and then compressed by the compression circuit 34 and temporarily stored in the recording buffer memory 35. The data accumulated here is compression encoded by the encoder 36 and sent to the recording circuit 37 as encoded information. Then, in the recording circuit 37, in accordance with a predetermined write control signal from the CPU 43, write processing of coded information to the medium disk 30 is performed.

The information recorded on the medium disk 30 is read into the reproduction circuit 38 through the pickup 31, decoded by the decoder 39, and stored in the reproduction buffer memory 40, and the sequential expansion circuit 41 is stored. , And is analog output at the DA converter 42.

Patent Document 1: Japanese Patent Application Laid-Open No. 11 273246

Disclosure of the invention Problem that invention tries to solve

In the conventional data processing apparatus and data processing program as described above, since write information (for example, music information) of the rimmed medium disk 30 is optically read through the pickup 31, If reading is performed under vibration as in the case of mounting, the reading state tends to be unstable. Also, the storage capacity value of the reproduction buffer memory 40 is considerably smaller than the storage capacity value of the medium disk 30, and the data transfer rate of the reproduction buffer memory 40 is smaller than the reading speed of the medium disk 30 side. Pretty big. Therefore, the reading of the medium disk power during playback becomes unstable, and the encoding process is interrupted, so that high-speed hopping can not be performed, or playback interruption such as skipping during playback output using an AAC decoder There is a problem that is likely to occur.

Furthermore, in the data processing program for performing the conventional recording and reproduction as described above, particularly during high-speed reading of medium disk 30 during data encoding processing for ripping music information on medium disk 30. Or, because it is necessary to decompress the music information of the medium disc 30, there is a problem that it is not possible to play back any music. In addition, during high-speed rigging, the load on the CPU (Central Processing Unit) increased, and virtually nothing could be done by other operations.

The present invention has been made to solve such conventional problems, and provides a data processing apparatus capable of processing and reproducing read information from an external memory such as a medium disk without interruption. It is an object of the present invention to provide a data processing program capable of executing reproduction processing using data from an external memory such as a disk-like recording medium at high speed while suppressing CPU load.

Means to solve the problem

In order to achieve the above object, a data processing apparatus according to the present invention is a processor that reads external memory data storing data and processes the data, and a processor that is accessed by the processor and stores processing data of the processor And a second knocker memory which is accessed by the processor at an access speed smaller than the access speed to the first buffer memory than the access speed to the external memory by the processor. It is characterized by [0010] With this configuration, even if data reading from external memory or transfer input is easily interrupted, data can be stored in the second knocker memory whose access speed is faster than that of data input. It is possible to continuously execute high-speed data processing using the first buffer memory while absorbing the influence by the second buffer memory even if the data reading or transfer input is temporarily interrupted. become.

[0011] In the data processing apparatus of the present invention, the second buffer memory is preferably a storage device having a storage capacity larger than that of the first buffer memory.

With this configuration, the access speed is faster than the speed of reading or transferring data from the external memory, and there is room for input data such as read data to the second buffer memory with a larger storage capacity value than the first buffer memory. The first buffer memory can be stored by holding it, and even if the data read from the external memory or the transfer input is temporarily interrupted, the second buffer memory reliably absorbs the influence of the first buffer memory. The high-speed data processing used can be continuously executed.

Also, if the second buffer memory is a fixed storage device such as a node disk or a solid state memory card, it may be difficult to read outside when the outside air or dust gets into the reading unit or the reading becomes unstable. The problem is avoided, and the second buffer memory can be effectively used as a shockproof memory together with the first buffer memory.

In the data processing apparatus of the present invention, the storage device may be a removable storage device.

With this configuration, it is possible to easily switch the storage capacity of the second buffer memory in response to the expansion of the application of the device, the capacity increase of the external memory, and the like.

In order to achieve the above object, a data processing program according to the present invention stores a computer in a storage device for storing data stored in an external memory in a storage device, and the storage device stores the data by the storage device. It is characterized in that it functions as a compression means for compressing data and a reproduction means for reproducing data stored in the storage device when the compression means is compressing.

With this configuration, storage is performed even while the compression means is performing data compression processing. Using the data stored in read data format in the device, it is possible to execute reproduction processing by the reproduction means without decoding processing.

[0015] In the data processing program of the present invention, the reproduction means is characterized in that the data compressed by the compression means is reproduced when the data compression by the compression means is completed.

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

According to the present invention, input data is temporarily stored by a second buffer memory whose access speed is faster than data input from an external memory, and data input from the external memory is temporarily interrupted. Also, since it is possible to continuously execute high-speed data processing such as ripping using the first knock-off memory while absorbing it with the second buffer memory, reading of the removable disk-like recording medium becomes unstable. Easy vibration · It is possible to provide a data processing device capable of effectively preventing the interruption of reproduction information such as a sound skipping even in an impact environment, for example, in a vehicle traveling off road.

Further, according to the present invention, even if the compression means executes data compression processing, data stored in the read data format in the storage device can be used even if the data compression process is being performed. Since reproduction output processing can be executed by the reproduction means without performing code processing, even if high-speed data transfer is performed from an external memory such as a disk-shaped recording medium, the reproduction processing using that data can be performed by the CPU load. It is possible to provide a data processing program that can be executed reliably while suppressing the

Brief description of the drawings

[FIG. 1] FIG. 1 is a block diagram showing a schematic configuration of a recording and reproducing apparatus of an on-vehicle navigation system equipped with a data processing program according to one embodiment of the present invention.

[FIG. 2] FIG. 2 is an explanatory diagram for explaining the structure of a storage area of a storage device according to an embodiment of the present invention.

[FIG. 3] FIG. 3 is a flow chart of an essential part of a data processing program according to an embodiment of the present invention. [FIG. 4] FIG. 4 is a block diagram showing the configuration of a conventional recording and reproducing apparatus

Explanation of sign

1 Disc-shaped recording medium

11 processor (computer)

12 1st buffer memory

13 Second buffer memory (storage device)

A1 Read-only first LBA area

A2 FAT area for map data

A3 Transaction-safe FAT (TFAT) area for music data

FAT area for A4 HMI data

A5 Work area that is the PCM data storage area for ripping

BEST MODE FOR CARRYING OUT THE INVENTION

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

The present embodiment is an application of the data processing apparatus of the present invention to a recording and reproduction apparatus (hereinafter simply referred to as a recording and reproduction apparatus) of a navigation system for vehicles, and is equipped with the data processing program of the present invention. It is

As schematically shown in FIG. 1, the recording and reproducing apparatus according to the present embodiment reproduces and compresses read data from disc-shaped recording medium 1 (external memory) and input data from other external memory. A multi-threaded processor 11 for storing and processing, a first buffer memory 12 accessed by the processor 11, and a second knock 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 may be, for example, an optical readable CD (Compact Disc), a DVD (Digital Versatile Disc) or another optical disc. There is. The data recorded on the disc-shaped recording medium 1 is, for example, PCM (Pulse Code Modulation) digital audio data such as CD-DA (Compact Disc Digital Audio), but MP3 (MPeg audio layer 3) compressed data However, the image data may be included without limitation. Also, the disc-shaped recording medium 1 is not limited to the optical disc, and the first buffer memory 12 and the second buffer memory 12 are not limited. The transfer data transfer rate of read data must be slower than that of the buffer memory 13 as a removable data storage medium!

The data recorded on the disc-shaped recording medium 1 is read by a CDZ DVD deck or other disc drive 10 and transferred and output at a predetermined data transfer rate. That is, the disk drive 10 is a means for inputting and transferring data from the external memory. The disc drive 10 not only reproduces data recorded on a disc-shaped recording medium 1 such as a CD or DVD, but also writes data on a disc-shaped recording medium 1 of a predetermined format such as a write-once type or a rewritable type. It is possible.

The processor 11 has a microcomputer configuration including a CPU, a memory, and an interface, and in the data processing, the processor 11 exchanges data to be processed with the first buffer memory 12 and the second buffer memory 13. At the same time, direct memory access method data transfer processing (hereinafter, simply referred to as DMA transfer) is executed to the disk drive 10 as well.

The first buffer memory 12 readably stores data to be subjected to data processing in the processor 11 and exchanges data with the processor 11 being processed. The first buffer memory 12 is composed of a semiconductor memory device which functions as a high-speed buffer memory having a data storage capacity of, for example, about 2 megabytes.

The processor 11 is a first storage area of the second buffer memory 13 in a data format at the time of reading capable of normal reproduction of read data in response to a reproduction request input, for example, PCM digital audio data (see FIG. Read function thread T1 as storage means to be temporarily stored in the LBA area in the following; and compression encoding processing of read data corresponding to recording request input, for example, AAC (Advanced Audio Coding) encoding processing The encoding function thread T2 as compression means and the encoded data are stored in a second storage area (FAT area in FIG. 1; described later) of the second buffer memory 13 as a music data file for one song, for example. Accumulated recording, here the accumulated recording function thread T3 for recording, and stored data temporarily stored in the second Knoffer memory 13 in response to the reproduction request input , For example, based on the PCM digital audio data, the first reproduction function thread T4 as a reproduction means for voice reproduction output Te is encoding process of the second buffer memory 13 F Data stored in the AT area, for example, an AAC data file for one music track is read and decoded. The decoding function thread T5 as a reproduction means after compression completion for decoding processing is executed, and a plurality of other Thread T6 can be executed, for example, a thread for updating position information of a vehicle on a navigation map, search processing, video reproduction, operation of a human 'machine' interface (hereinafter referred to as “ΗΜΙ”), and the like.

The second buffer memory 13 includes an LBA (Logical Block Addressing) area as a first storage area which can quickly read the recording information by logical block address management, and one or more predetermined OSs It has a FAT (File Allocation Table) area as a second storage area for readably recording and storing file information of a predetermined file format handled by the operating system.

Specifically, for example, as shown in FIG. 2, the second buffer memory 13 is a read-only first LBA area Al, map data FAT area A2, music data TFAT

It has a Transaction-safe FAT area A3, a FAT area A4 for HMI data, and a work area A5 which is a PCM data storage area for reading. 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 designed to prevent the loss of transaction data on a memory card or hard disk when power supply is low.

The second buffer memory 13 is configured of a storage device having a storage capacity larger than that of the first buffer memory 12, for example, a node disk drive or a memory card excellent in vibration resistance performance. There is. The hard disk here is a small one to be mounted on a portable information device, and the memory card here is a card or stick having a semiconductor memory element of about the size of a PC card or less. . Incidentally, the fixed recording medium referred to here is one in which the medium storing the information is not separated from the apparatus main body reading the information on the medium. However, the second buffer memory 13 is configured as a storage device removable from the navigation system case (not shown) as a whole of the device, and it is possible to replace, repair, or compress data in advance. It is designed to be able to replaceably store stored storage devices.

The data transfer rate of the second buffer memory 13 is, for example, 10 megabytes per second to 30 The speed is about meganoitos per second, and this speed is the first buffer memory 12 which is larger than the transfer rate of read data of 10 powers of the disk drive (access speed to external memory; for example, 170 kilobytes per second to 1.7 megabytes per second). Less than the access speed of That is, the speed of writing and reading data, 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 the data transfer speed of the first buffer memory 12 (for example, 200). More than a megabyte per second).

Next, with reference to FIG. 1 and FIG. 2, an outline flow of data relating to storage, compression, storage, recording, and reproduction of read data in the recording and reproduction device of the present embodiment will be described.

[0033] The CD-DA data recorded on the disc-shaped recording medium 1 is converted to ATAPI (AT Attachment Packet) in response to a request from the reading function thread T1 (storage means) of the processor 11.

Interface) It is read by the disk drive 10 equipped with a driver, and DMA (Direct Memory Access) transfer output is performed at a predetermined data transfer rate of, for example, 170 kilobytes to 1.7 megabytes. The flow of this data is shown by arrow da in FIG.

The read data transferred and output here is, for example, the second LBA of the second buffer memory 13 with the data of one track of the recording track on the disk-like recording medium 1 (hereinafter referred to as track data) as the writing unit. The data is written to a plurality of logical blocks in area A5. Such writing (storing) of data to the second buffer memory 13 is performed by allocating logical block addresses in the order of track numbers, as shown by TRK1, TRK2, TRK3 '' in FIG. It is executed on the data of all the recording tracks on the recording medium 1.

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

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

At the time of reading this stored data, encoding function thread T 2 (compression of processor 11) Means to execute AAC encoding processing and store and record AAC data of a predetermined file size in the second buffer memory 13 sequentially (indicated by an arrow de in FIG. 1) by the storage and recording function thread T 3 of the processor 11 be able to.

On the other hand, the first reproduction function thread T4 (reproduction means) of the processor 11 sequentially performs PCM reproduction of the desired music by sequentially using the track data in the PCM data format as it was at the time of reading.

Furthermore, for the audio data stored in the second buffer memory 13, the decode function thread 5 (the reproduction means after completion of compression), which is the second reproduction function of the player 11 according to the reproduction request input It is decoded appropriately, and reproduced and output by the amplifier 15 and the speaker 16.

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

In FIG. 3, first, whether or not there is a recording request based on a user operation is checked (step S1), and if there is a request, the reading function thread T1 of the processor 11 checks the data from the disc-shaped recording medium 1 A read is performed (step S2), and the read data is stored in the LBA area of the second buffer memory 13 (step S3). Then, based on the stored data, AAC encoding processing by the encoding function thread 2 is performed, that is, compression encoding of read data is performed, and the compressed data is stored by the accumulation recording function thread 3. Is recorded in a predetermined file format in the FAT area of the file (step S4).

[0041] If there is no recording request at the time of the previous check (if YES in step SI), or if data compression and recording in step S4 are started, then whether or not there is a reproduction request based on user operation Is determined (step S5). At this time, if there is a reproduction request (YES in step S5), it is checked whether the AAC encoding process for data compression is in progress (step S6). If AAC encoding is in progress (YES in step S6) In the case of (1), the first playback function thread T4 also reads PCM audio data from the LBA area of the second buffer memory 13 in a different path from reading for AAC encoding processing, and playback audio is output (step S7). When the AAC encoding process is completed in step S6, the decoding function thread T5, which is the reproduction means after compression is completed, performs a decoding process of compressed data for the music for which reproduction is requested, and the reproduced sound is output. Is done (step S8).

As described above, in the data processing program according to the present embodiment, the processor 11 is a disk by causing the processor 11, which is a computer, to execute the processing of the threads T1 and T5 as described above. Storage means (thread T1) for storing the data stored in the second recording medium 1 in the second buffer memory 13 and compression means for compressing the data stored in the second knock out memory 13 by the storage means (thread T2) can be functioned as a reproduction means (thread T4) for reproducing data stored in the second knock out memory 13 when this compression means is compressed.

Therefore, even while the compression means thread T2 is executing data compression processing, processing is performed using data stored in the second buffer memory 13 in the data format at the time of reading. It is possible to execute the reproduction process by the reproduction means thread T4 which does not perform the heavy load decoding process. Furthermore, by controlling the playback ratio of compressed data and PCM data, the CPU load can be reduced, and the processing capacity of software encoding can be increased.

Specifically, for example, the PCM reproduction process is executed until all songs for CD-pieces are completed, and CPU time allocation sufficient for the encoding process can be performed during the ripping, so that the ripping can be performed. Speed can be improved. In addition, you can specify the next song or all songs and play them even during high-speed ritsubing. However, in the case where encoding processing has just been started so that one or more songs can not be retribbed, retributing may be stopped and reproduction processing 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 the compression is completed reproduces the data compressed by the compression means, so that the encoding process is completed. In this state, compressed data can be decoded to perform various reproductions using stored data.

In the recording and reproducing apparatus according to the present embodiment as described above, even if the data read / transfer input from the disc-shaped recording medium 1 is easily interrupted, the access speed is faster than the data input, and the second Knoffer memory Disk-like recording media that can store data in 13 Even if the data read from 1 or the transfer input is temporarily interrupted, high-speed data processing using the first buffer memory 12 while absorbing it in the second buffer memory 13, for example, compression code It will be possible to continue to execute the decoy process.

The second buffer memory 13 is configured by a storage device having a storage capacity (for example, about 700-1 gigabyte) larger than the storage capacity (for example, about 2 megabytes) of the first buffer memory 12 Since it functions as a medium-speed buffer memory, the second buffer has an access speed faster than the speed of reading and transferring data from a disk-shaped recording medium and has a larger storage capacity than the first buffer memory 12 Input data such as read data can be accumulated with a margin in the memory 13, and the data read / transfer input from the disc-shaped recording medium 1 is an impact or vibration of the vehicle or the disc-shaped recording medium 1. Even if there is a temporary interruption due to dust or the like, it can be reliably absorbed by the second buffer memory 13 and, in the meantime, the first buffer It can be performed to continue high-speed data processing using memory 12.

Further, in the present embodiment, since the second buffer memory 13 is a fixed storage device such as a node disk or a solid-state memory card, ambient air or dust may enter the reading unit or reading may be performed by vibration. If it becomes unstable, any problems will be avoided, and it is effective to use the second buffer memory 13 in combination with the first buffer memory 12 as a shockproof memory.

Furthermore, in the present embodiment, since the storage device forming the second buffer memory is a removable storage device that can be attached and detached, the application of the present apparatus can be expanded (for example, option addition), or a disk The storage capacity of the second memory 13 can be easily switched in response to the increase in the capacity of the external memory such as the recording medium 1, etc., and various requirements can be sufficiently met.

Industrial applicability

As described above, according to the data processing apparatus of the present invention, reading of the removable disk-shaped recording medium is unstable and easy to read. The effect of effectively preventing discontinuation of reproduction information such as disc sound skipping is provided, and storage of music information etc. read on a medium disc is performed. And as a playback device, it is further useful as part of a navigation system.

Further, in the data processing program according to the present invention, decoding processing is performed using data stored in a read data format and stored in the storage device even while the compression means is executing data compression processing. Even in the case where information data can be read at a high speed from an external memory such as a disk-shaped recording medium, the reproduction processing using the data can be reliably performed while suppressing the CPU load even if the reproduction processing can be executed without reproducing. The media disk is equipped with a data processing program suitable for storing and reproducing the read information, and further equipped with a navigation system for effective data. It is useful as a processing program.

Claims

The scope of the claims

[1] A processor that reads data from an external memory that stores data and processes this data;

A first knocker memory accessed by the processor and storing processing data of the processor;

And a second buffer memory accessed by the processor at an access speed greater than an access speed to the external memory and smaller than an access speed to the first buffer memory.

[2] The data processing apparatus according to claim 1, wherein the second buffer memory is a storage device having a storage capacity larger than a storage capacity of the first buffer memory.

[3] The data processing apparatus according to claim 2, wherein the storage device is a removable storage device.

[4] 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 characterized by functioning as reproduction means for reproducing data stored in the storage device when the compression means is compressing.

5. The data processing program according to claim 4, wherein the reproduction means reproduces the data compressed by the compression means when the data compression by the compression means is completed.