JPH0997479A - Information recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a system optimum for a recording device of data such as a picture, sound, etc., having the feature of huge and indefinite length. SOLUTION: The lead of a data group which is an editing unit of the picture, sound, etc., is detected in a HDD(hard disk drive) 1, and just before that time, a violation code is added as a code having feature and recorded on a disk 10. At the time of data reproduction, the violation code added is detected in a track and the data group is accessed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field relating to an information recording device configured as a digital information recording / reproducing system such as a magnetic disk device and a magneto-optical disk device.

[0002]

2. Description of the Related Art Conventionally, data recorded in an information recording device for recording and reproducing digital signals has been controlled by a file management function of an OS (operating system) of a host computer. In other words, the recording device itself does not know the recording location of data on the disc that is the recording medium, the free area, and the like, and recording / reproduction is performed at a location designated with the command from the host computer.

In addition, in "MS-DOS" and "UNIX" which are widely used among OSs, a data block of a fixed size (512 bytes or 1024 bytes, etc.) is set as a recording area when the disk is initialized (formatted). The recording / reproducing is performed by dividing this block into units. This is called the fixed size division method.

The fixed size division method is excellent in area utilization efficiency and file expansion flexibility.

In the fixed size division method, a block-specific number (sector ID) is written at the beginning of each block during disk initialization (formatting). The host computer manages this sector ID as a series of logical block numbers, and when recording / reproducing data, the position on the disc to be recorded or reproduced is given from the host computer in the form of a logical block number.

The sector ID comprises, for example, as shown in FIG. 3, an 8-bit sector number 111, a 16-bit track number 112, an 8-bit surface number 113, and a 16-bit error check code (CRC) 114. There is.

[Circuit System] An example of a system configuration in which a normal magnetic disk device is used (when the OS is “MS-DOS”) is as shown in FIG.

A BIOS 133, a device driver 132, and a logical format program 131 are installed as software other than the OS 130 on the host computer.

The BIOS 133 is a hard disk I / O
It is a program that summarizes the hardware-dependent parts that perform services.

The device driver 132 is a program that allows a hard disk to be accessed as a block device, and associates a file with a logical block on the disk.

The logical format program 131 is a program for writing necessary initialization information (sector ID, file management table, etc.) when the disk is initialized.

As described above, normally, the file management is performed by the host side, and the recording device (HDD) 101 side converts the logical block number given from the host into the sector ID number representing the physical position on the disk. , Recording / reproducing is performed at the position on the disc.

HDC (Hard Disk Controller) 1
Reference numeral 03 controls recording and reproduction operations. Various commands and data from the host are transmitted to the MPU (microprocessor unit) 104 via the HDC 103.

The MPU 104 accesses the control register in the HDC 103 by its firmware to control the HDC 103, and further, the buffer RA
M102, R / W channel circuit 105, servo circuit 10
6 and controls the interface bus 108 and the like.

With respect to the host computer, commands are interpreted according to the interface protocol, and data is exchanged while controlling the buffer RAM 102.

For the R / W channel circuit system 105,
Writes and controls the necessary data in the internal registers of the circuits required for data recording and reproduction.

A track number to be recorded or reproduced is designated for the servo circuit 106.

The buffer RAM 102 serves as a medium for transmitting and receiving data between the host and the disk, and absorbs the difference in data transfer speed.

[Format Operation] The format operation in the fixed size division method will be described.

In response to a format command from the host computer, the MPU 104 first writes necessary values in the internal control register of the HDC 103 and the internal registers of the peripheral circuits.

The HDC 103 has various control registers inside, and the MPU 1 is connected via these registers.
Exchange information with 04. Some of these control registers together form a disk sequencer that describes the record / playback / format operation sequence. Recording / playback / formatting operations are performed as described by the disk sequencer. In the disk sequencer, necessary values are set by the MPU 104 according to the type of operation (recording, reproduction, format).

The logical block number given by the logical format program 131 on the host computer is the sector I by the firmware of the MPU 104.
It is converted into a D number and set in this disk sequencer.

Normally, the logical block number 0 is associated with the surface number 0 of the sector number, the track number 0, and the sector number 0. Now, this sector number is represented as (0,0,0).

At the time of formatting, each track is, for example,
It is divided in units of 512 bytes (called a block), and the sector ID is recorded at the beginning of each block. For example, (0, 0, 0) is recorded at the beginning of the block after the reproduction signal of the home index provided on the disc, and thereafter, while incrementing the sector number,
It will be recorded.

When one track is completed, the MPU 104 specifies the next track number to the servo circuit 106. Based on the value, the servo circuit 106 generates a control signal by a known method, drives the VCM (voice coil motor) 107, and the magnetic head 110 facing the disk.
After positioning the center of the desired track, (0, 1,
From 0), the sector ID is recorded as described above.

When the first side of the disk is finished, MPU1
In 04, the head number is designated to the R / W channel circuit 105, and the active head is switched. The servo circuit 106 records the sector ID again from the 0th track (1, 0, 0) as described above.

In parallel with these operations, a file management table is created on the disk ("MS-D
"OS" is called "FAT").

[Data Recording / Reproducing Operation] Basic Recording /
The circuit system operation at the time of reproduction is widely known.

That is, in response to a recording / reproducing command from the host, the MPU 104 first writes necessary values in the internal control register of the HDC 103 and the internal registers of the peripheral circuits.

In the servo system, the servo circuit 106 also generates a control signal based on the track number converted from the logical block number, drives the VCM (voice coil motor) 107, and drives the magnetic head 110 to a desired track. Position in the center.

The logical block number given by the host is the sector I by the firmware of the MPU 104.
It is converted into a D number and set in the disk sequencer of the HDC 103.

The HDC 103 includes an R / W channel circuit 10
The data input from 5 is compared with the desired sector ID number set in the disk sequencer, and if they match, the recording / reproducing operation for the sector is started.

[0033]

The above-described conventional information recording apparatus for recording / reproducing a digital signal has the following problems.

For example, when a video HDD is used to record and reproduce data such as images and sounds, one file has a very large size. For example, even a minimum editing unit (“GOP”) of data compressed by a so-called “MPEG method” which is a motion compensation predictive coding method has an average size of about 3 megabits (Mbit), and a small disk drive. It will span several tracks.

The length of one file is indefinite.

Further, it is assumed that the host is not a computer but an audio-visual (AV) device such as a general television (TV) device. In this case, the host does not have a management function such as the sector ID number.

In such a situation, the file system for ordinary computer data becomes very redundant. Moreover, in order to use the current recording devices for computers, a dedicated file system is used as a host (TV device, etc.)
It needs to be installed inside, which causes an increase in cost.

[0038]

In order to solve the above-mentioned problems, the present invention detects the beginning of a data group which is an editing unit of video and audio and adds a violation code as a characteristic code immediately before that. I decided to record it. During data reproduction, the violation code added in the track is detected and the data group is accessed.

That is, the information recording apparatus according to the present invention is
Detection means for detecting the beginning or end of one data group input from the host, and a predetermined violation code is added immediately before or after the data group based on the output signal of this detection means, and this violation code is added. And a controller that outputs the recorded data as recording data.

According to the above configuration, it is possible to configure an optimum system as a recording device for data such as video / audio having a characteristic of long and indefinite length.

Further, since it is not necessary to provide a file system on the host side and the management can be closed on the recording device side, portability is excellent. Since the management on the recording device side does not perform complicated file management for the computer, the memory area for file management becomes small and the cost increase can be suppressed.

[0042]

[Embodiment]

[Embodiment 1] [Configuration of system used in the present invention] Hereinafter, a system configuration using a magnetic disk device characteristic of the present invention and its operation will be described.

In the following description, the so-called "MPE" is used as an example of the video / audio compression method which is the motion compensation predictive coding method.
Consider the "G" method.

In the "MPEG" system, the encoding is made based on the image data before and after, so that the information is not completed with only one screen. As a method for enabling random access and halfway editing, some screen data can be handled as a group. This unit is called "GOP". In order to access the "GOP", an information area called a sequence header is provided at the beginning of the "GOP". This sequence header part includes information designating a screen format and the like. Furthermore, a characteristic (unique) start code called a sequence header code is added to the beginning of the sequence header section. The sequence header code is 4 bytes (Byte) 000001B3h.
The minute code is specified.

As an example of the configuration of the information recording apparatus according to the present invention, as shown in FIG. 1, a TV (television) set 9 is provided.
1 shows an example of the configuration of an HDD (hard disk drive) system built in the HDD.

In the TV set 9, HDD 1, MPEG
Encoder (Motion Compensation Predictive Encoder) 20, MPEG
A decoder (motion compensation predictive decoder) 21 is built in.

The video input and the audio input to the TV set 9 are selected by the switch 22 and the switch 23, respectively, in the connected or disconnected state with the recording device. Switch 2
2 and the connection state of the switch 23 satisfy the following relationship in [Table 1].

[0048]

[Table 1]

In the above [Table 1], in the case of state 1, T
The video and audio inputs to the V set 9 are demodulated as video signals as they are and output to the cathode ray tube and to the speaker as audio signals. In this case, the system is the same as a normal TV receiver.

In the above [Table 1], in the case of state 2, T
The video and audio inputs to the V set 9 are demodulated as video signals as they are to the cathode ray tube and output as audio signals to the speaker, and the MPEG encoder 20
Then, the data is encoded into compressed data of the “MPEG” system, input to the built-in HDD 1, and recorded.

In the above [Table 1], in the case of state 3, T
Video and audio input to the V set 9 passes through the MPEG encoder 20, is encoded into compressed data of the "MPEG" system, is input to the built-in HDD 1, and is recorded on a disk serving as a recording medium. The recorded data is reproduced from the HDD 1 and sent to the MPEG decoder 21, and the decoded data is output as video and audio signals.

A signal flow when recording is performed on the HDD 1 (state 2 or 3) will be described.

MPU (microprocessor unit)
4, the HDC (hard disk controller) 3, the buffer RAM 2, the R / W channel 5, the servo circuit system 6 and the like have the same functions as those in the conventional information recording apparatus described above except for the following points.

The HDC 3 has "GO" in addition to its normal function.
It has the function of detecting the sequence header of "P" and adding a violation code.

In addition to the normal function, the MPU 4 has a simple track-unit file management function.

[Data Recording / Reproducing Operation] Basic Recording /
The circuit system operation at the time of reproduction is widely known.

That is, the MPU 4 obtains the track number to be accessed by its own file management function. In response to a recording command from the host, the MPU4 first sets H
The necessary values are written in the internal control register of DC3 and the internal registers of the peripheral circuits.

In the servo system, the servo circuit 6 generates a control signal according to the track number set by the MPU 4 and drives the VCM (voice coil motor) 7 to drive the magnetic head 10 to the desired position on the disk. Position in the center of the track.

In the R / W channel 5, a home index pattern, which indicates the origin of rotation provided on the disk one by one, is detected and transmitted to the HDC 3.

[Internal Operation of HDC] The internal configuration of the HDC 3 of the HDD 1 incorporated in the TV set 9 is shown in FIG.

[During Data Recording] The host I / O unit is provided with the host I / F controller 11 and determines whether the signal from the host is a command or data to be recorded. When the signal from the host is a command, this signal is sent to the MPU4 by the MPU I / F controller 16 through the internal bus.
Tell. When the signal from the host is the recording data, this signal is sent to the header detecting unit 12 which is a detecting means.

The header detector 12 detects a specific "GOP" header code from the data string input from the host. The detection result is transmitted to the buffer controller 13.

When receiving the header detection signal from the header detection section 12 during data recording, the buffer controller 13 records the write start buffer address of the data after the header code. This write start buffer address will be called a header address.

On the other hand, the disk controller 15 determines the write start position on the disk by a specific signal (home index detection signal, etc.) input from the disk I / F, and the start buffer address previously recorded by the buffer controller 13 is determined. To the data from the disk I /
Send to F. At that time, a violation code having a specific characteristic is added before the header code and output.

The violation code is set at the start position of the disk sequencer by the MPU firmware before the recording / reproducing operation.

When data is output from the header address in the buffer to the next header address -1, the operation of outputting the violation code is resumed, and the data is output from the next header address.

When recording "GOP" continuously,
This operation is repeated.

[When playing data] Disk controller 1
Reference numeral 5 compares the violation code set in the sequencer map with the input data prior to the reproduction operation, and if the comparison matches, the subsequent data is sent to the violation code detection section (VC detection section) 14. send.

The violation code detector 14 detects a specific violation code from the data string input from the disk I / F via the disk controller,
This is deleted and the violation code detection signal and subsequent data are sent to the buffer controller 13.

The buffer controller 13 records the write start buffer address at the start of reproduction. Also,
When the violation code detection signal from the violation code detection unit 14 is received, the write start buffer address of the immediately following data is recorded.

These facilitate the access to the head of the "GOP" from the host.

[Embodiment 2] In this embodiment, not only a violation code is added corresponding to a sequence header, but also a violation code different from the above code corresponding to the end of "GOP" is recorded. . In this case, the start violation code is set at the beginning and the end violation code is set at the end in the sequencer map in the disk controller 15 of the HDC 3.

At the time of data recording, the data after the violation code and the header address are output as in the first embodiment. With the buffer controller 13,
When the address of the next header address-1 is reached, the sequence for shifting the end violation code is moved on the sequencer map.

After that, the process returns to the beginning again, and becomes the output sequence of the start violation code. By repeating the above, continuous "GOP" is recorded.

At the time of data reproduction, the reproduction from the start violation code to the end violation code is repeated.

In this case, since the starting violation code is searched for each "GOP" and the data after that is reproduced, the violation code detecting section 14 is not necessary.

It is not necessary to record the "GOP" physically continuously, and it is possible to edit in "GOP" units.

[Other Embodiments] The header detection portion and the violation code detection portion of the HDC 3 may be configured as so-called “external” instead of being built in the HDC 3.

The number of violation codes is not limited to one. Start recording (beginning of file) in addition to "GOP"
, Recording end (file end), and point.

Further, although "GOP" is accessed by the file management mechanism of MPU4,
The data may be accessed by continuously reading the data, detecting the “GOP”, and counting the number.

Further, the embodiments described so far are
Although the magnetic disk device is assumed, the information recording device according to the present invention may be configured as a magneto-optical disk device.

[0082]

As described above, according to the present invention,
It is possible to configure an optimum information recording device as a recording device for data such as image and sound having a long and indefinite length.

Further, since it is not necessary to provide a file system on the host side and the recording apparatus side can perform closed management, portability is excellent. Since the management on the recording device side does not perform complicated file management for the computer, the memory area for file management becomes small and the cost increase can be suppressed.

According to the present invention, which is a disc type recording / reproducing apparatus using a disc as a recording medium, it is an object to facilitate recording / reproducing of indefinite length data such as image / audio information in a (header detection) digital information recording apparatus. In addition, by detecting the beginning of the data group and adding the violation code immediately before the detection, the information recording apparatus optimal for recording the audiovisual information can be configured.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a circuit configuration in a TV set according to a first embodiment of the present invention.

2 is a hard disk controller (H) of a hard disk drive (HDD) built in the TV set of FIG.
It is a block diagram explaining the composition of DC).

FIG. 3 is a schematic diagram illustrating a sector ID area of a conventional magnetic disk.

FIG. 4 is a block diagram showing a configuration of a system using a conventional magnetic disk device.

[Explanation of symbols]

 1 HDD (hard disk drive) 2 Buffer RAM 3 HDC (hard disk controller) 4 MPU (microprocessor unit) 5 R / W channel circuit 6 Servo circuit 7 VCM (voice coil motor) 10 Magnetic head 11 Host I / F controller 12 Header detection Part 13 Buffer Controller 14 Violation Code Detecting Part 15 Disk Controller 16 MPU I / F Controller 17 Disk ECC Controller 20 MPEG Encoder 21 MPEG Decoder 22 Switch 23 Switch

Claims (8)

[Claims] 1. A detection means for detecting the beginning or end of one data group input from a host, and a predetermined violation code is added immediately before or after the data group based on an output signal of the detection means, An information recording device comprising: a controller that outputs the data to which the violation code is added as recording data. 2. A head detecting means for detecting the head of one data group input from a host, and a predetermined violation code is added immediately before the data group based on an output signal of the head detecting means,
An information recording device comprising: a controller that outputs the data to which the violation code is added as recording data. 3. The information recording apparatus according to claim 1, further comprising a violation code detecting means for detecting a violation code recorded on a disk-shaped recording medium. 4. The information recording apparatus according to claim 1, further comprising violation code counting means for counting violation codes, wherein the information group is accessed by the value counted by the violation code counting means. 5. Information recorded and reproduced on a recording medium comprises:
The information recording apparatus according to claim 1, wherein the information recording apparatus is a compressed image or audio data. 6. Information recorded and reproduced on a recording medium comprises:
The information recording apparatus according to claim 5, wherein the data is data compressed by a motion compensation predictive coding method. 7. The information recording apparatus according to claim 6, wherein the sequence header in the motion compensation predictive coded data is set to the head of one data group. 8. The information recording apparatus according to claim 7, wherein the recording medium is a magnetic disk, and recording / reproducing of information to / from this magnetic disk is performed by a magnetic head.