JPH08195027A - Hard disk device - Google Patents

Abstract

PURPOSE: To record/reproduce a moving picture without providing a FIFO in the outside by performing the rotational control of a magnetic disk and controlling the timing of an interface in synchronisim with a synchronizing signal. CONSTITUTION: At the time of reproducing the magnetic disk, the synchronizing signal from a synchronizing signal generating circuit 9 is transmitted to a CPU 7 and a terminal 6 via a switch 60. The synchronizing signal of the terminal 60 is transmitted to a hard disk controller CNT 3 and a spindle servo circuit 20. The circuit 20 performs the rotational control whose phase is locked with a vertical synchronizing signal and the signal reproduced from a magnetic disk 10 via a magnetic head 11 is transmitted to the CNT 3 via a modulation circuit 12 to be subjected to an error correcting processing. The CNT 3 transmits data to decoder circuit 91 via an interface 5 in agreement with the phase of the vertical synchronizing signal. The synchronizing signal from the circuit 90 is added to data transmitted to the circuit 91, and is video signal is sent to a terminal 90.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard disk device which is particularly suitable for reading / writing sequential data such as moving image data and audio data.

[0002]

2. Description of the Related Art A hard disk device is a storage device which can store a large amount of data and can transfer the data at high speed. A moving image recording / reproducing system using such a hard disk device has been proposed.

In a conventional hard disk device, an IDE system or a SCSI system is used as an interface. In these interfaces, data is read / written after a command or address is specified. For this reason, when the conventional hard disk device is used in a moving picture recording / reproducing system, a buffer for temporarily storing the recording / reproducing data is required.

That is, FIG. 5 shows a configuration of a conventional hard disk drive device. This hard disk drive device has a drive block 201, a servo block 202, a cache memory 206, and a hard disk controller 208.

The drive block 201 comprises a magnetic disk 210, a magnetic head 211 for writing / reading data to / from the magnetic disk 210, and a modulator / demodulator 212 for modulating / demodulating data.

The servo block 202 comprises a spindle motor 222 for rotating the magnetic head, a voice coil motor 221 for moving the magnetic head, and a servo circuit 220 for controlling the spindle motor 222 and the voice coil motor 221.

The cache memory 206 is used to temporarily save input / output data. The hard disk controller 208 controls the internal mode in accordance with the command of the host CPU, and the cache memory 2
06 control and error correction processing for input / output data.

In this hard disk device, as the input / output interface 203, for example, an IDE type interface is used. Data input / output and command / address input / output are performed between the host CPU (not shown) and the interface 203.

In the IDE interface 203, the host CPU accesses the register address assigned on the interface. The registers include a command register, an address register, a data register and the like. The host CPU first writes a command such as WRITE or READ in the command register. Then, the write or read destination address is written in the address register. Then, the data register transmits / receives data.

The hard disk controller 208 controls the mode inside the hard disk according to the sent command. The modes include a write mode and a read mode.

In the write mode, when the hard disk controller 208 receives a WRIT command, it outputs servo information to the servo block 202 based on the address sent next. The servo block 202 seeks the magnetic head 211 to a predetermined position on the magnetic disk 210 based on this servo information. The hard disk controller 208 also adds an error correction code to the data output by the host CPU and outputs the data to the drive block 201. In the modulator / demodulator 212 of the drive block 201, 1-7 RLL (Run Length)
LImited) modulation is performed, and the modulated data is recorded on the magnetic disk 210 through the magnetic head 211. This operation is repeated for each sector.

In the read mode, when the hard disk controller 208 receives a READ command, it gives servo information to the servo block 202 based on the address sent next. The servo block 202 seeks the magnetic head 211 to a predetermined position on the magnetic disk 210 based on this servo information. From the magnetic disk 210 of the drive block 201 to the magnetic head 2
The signal reproduced through 11 is 1-
7RLL demodulation is performed and hard disk controller 2
It is output to 08. Hard disk controller 208
Then, error correction processing is performed and the data is output to the host CPU. This operation is repeated for each sector.

The hard disk controller 208 arbitrates the timing between the interface 203 and the drive block 201 in both the write mode and the read mode in order to arbitrate the cache memory 20.
6 has the function of saving data. In particular, when the data is available, the data is output from the cache memory 206 to the interface 203 without being reproduced from the magnetic disk 210.

FIG. 6 shows an example of a moving picture recording / reproducing system using such a conventional hard disk. In FIG. 6, the host CPU 110 manages the entire operation. A tuner 101 is provided here as a source of a signal to be recorded.

At the time of recording, the output of the tuner 101 is A
It is digitized by the / D converter 102 and sent to the encoder 103. The encoder 103 reduces the amount of information in order to record the digitized moving image data on the disc. As the encoder 103, one that thins out data to reduce the amount of information, JPEG
It is possible to use the one that compresses and encodes data by MPEG or MPEG. The data to be recorded is temporarily stored in the FIFO 104. The output of the FIFO 104 is supplied to the hard disk device 109 and recorded. The hard disk 109 is, for example, an IDE type interface.

At the time of reproduction, the output of the hard disk 109 is supplied to the decoder 106. The decoder 106
The processing opposite to the encoder 103 is performed to decode the reproduction data. The output of the decoder 106 is D /
The signal is supplied to the A converter 107, converted into an analog signal, and supplied to the television receiver 108.

[0017]

Conventionally, in the FIFO prepared outside the hard disk device, the system inside the hard disk and the input video signal are completely asynchronous. Therefore, when the seek time and the rotation waiting time are taken into consideration, there is a problem that the capacity of the FIFO becomes large and the cost increases in assembling the system.

Further, since the reference clock inside the hard disk and the clock of the system outside the hard disk are not synchronized, it is necessary to use an asynchronous FIFO as the interface system, which is complicated.

Therefore, the object of the present invention is to provide external F
An object of the present invention is to provide a hard disk device that can record / reproduce moving image signals without providing an IFO.

Another object of the present invention is to provide a hard disk device which does not waste information amount even in the case of a zone CAV disk.

[0021]

According to the present invention, a magnetic disk for recording / reproducing data, a magnetic head for moving on the magnetic disk to record / reproduce data on / from the magnetic disk, and rotation of the magnetic disk are controlled. In addition, in a hard disk device comprising a control means for controlling reading / writing of data to a predetermined address of the magnetic disk, the rotation cycle of the magnetic disk is synchronized with the synchronizing signal of the input or output video signal. It is a hard disk device characterized by

The present invention controls the rotation of a magnetic disk which records / reproduces data and has a zone CAV, a magnetic head which moves on the magnetic disk to record and reproduce data on and from the magnetic disk. In addition, a hard disk device comprising a control means for controlling reading / writing of data to / from a predetermined address of the magnetic disk, the hard disk device having an interface indicating a zone to which an access position belongs. .

[0023]

The present invention has an input terminal for inputting the synchronizing signal of the input signal, and controls the rotation of the magnetic disk using this synchronizing signal as a reference of the servo circuit, and at the same time controls the interface timing in synchronization with this synchronizing signal. As a result, when recording moving image information and audio information on the hard disk, it is not necessary to have a FIFO outside the hard disk. Further, in the case of the zone CAV, an interface for outputting the zone to which the position to be accessed belongs is provided. By changing the compression rate according to the information of this zone, it is possible to eliminate the waste of information amount.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. A hard disk device to which the present invention is applied has a drive block 1, a servo block 2, a hard disk controller 3, and a cache memory 4. Further, the hard disk device is provided with an interface 5 and an external synchronization input terminal 6. Further, the hard disk device 1 is provided with a switch 31 for selecting a clock from the external input terminal 6 and a clock from the clock generation circuit 30. When recording / reproducing moving image data, the external clock from the external input terminal 6 is selected.

The drive block 1 is a magnetic disk 10
And a magnetic head 11 for writing / reading data to / from the magnetic disk 10 and a modulator / demodulator 12 for modulating / demodulating data. The magnetic disk 10 is, for example, a CAV.

The servo block 2 comprises a spindle motor 23 for rotating the magnetic disk, a voice coil motor 22 for moving the magnetic head, a voice coil servo circuit 21 and a spindle servo circuit 20.

When the external input clock is selected,
When the external input clock is supplied, the hard disk controller 3 accesses commands, addresses and the like.
When the external input clock is input, the servo block 2 advances the address of the magnetic head 11 in order and locks the rotation of the spindle motor 23 to the external clock. When used asynchronously, the clock from the clock generation circuit 30 is used.

The cache memory 4 is used to temporarily save input / output data. The hard disk controller 3 controls the internal mode in accordance with a command from the host CPU, controls the cache memory 4, and performs error correction processing on input / output data.

The video signal input to the input terminal 80 is
The sync signal is separated by the sync signal separation circuit 8, and the sync signal passes through the switch 60 and is output to the host CPU 7 and the external sync input terminal 6 of the hard disk. Note that N
In the TSC system video signal, one field has 26
Of the 2.5 horizontal scanning lines, only about 240 have image information, and it is not necessary to record for the remaining period. The sync signal input to the external sync input terminal 6 is sent to the hard disk controller 3 and the spindle servo circuit 20. The hard disk controller 3 inputs data from the digital encoder circuit 81 through the interface 5 in accordance with the phase of the vertical synchronizing signal in a mode in which data is input while image information is present. Further, in the period when there is no image information, a mode for inputting / outputting data other than data is set, and a command, an address, or a status is exchanged with the host CPU 7 through the interface 5. The spindle servo circuit 20 performs rotation control phase-locked with the vertical synchronization signal. The data received by the hard disk controller 3 is added with an error correction code and then modulated by the modulation circuit 12 to obtain the magnetic head 1.
The data is recorded on the magnetic disk 10 through 1.

When reproduction is performed, the sync signal output from the sync signal generation circuit 9 passes through the switch 60 and is transmitted to the host C.
It is output to the external synchronization input terminal 6 of the PU 7 and the hard disk. The sync signal input to the external sync input terminal 6 is sent to the hard disk controller 3 and the spindle servo circuit 20. Spindle servo circuit 20
Performs phase-locked rotation control on the vertical synchronization signal, and the signal reproduced from the magnetic disk 10 through the magnetic head 11 is demodulated by the modulation / demodulation circuit 12 and output to the hard disk controller 3 for error correction processing. The hard disk controller 3 outputs the data to the digital decoder circuit 91 through the interface 5 in a mode in which the data is output while the image information is present, in accordance with the phase of the vertical synchronizing signal. Further, in a period when there is no image information, a mode for inputting / outputting data other than data is set, and commands, addresses or statuses are exchanged with the host CPU 7 through the interface 5. Since the data output to the digital decoder circuit 91 is only about 240 horizontal scanning line information, the synchronization signal generating circuit 9
By adding the synchronization signal output from the output terminal 9
The video signal is output to 0.

As shown in FIG. 2, in one embodiment of the present invention, commands, addresses, status, etc. are input to the hard disk drive during the vertical blanking period. In this way, by inputting the command, address, status, etc. during the vertical blanking period in which there is no video data, it is possible to record / reproduce moving image data in the hard disk device without providing a buffer.

In the above embodiment, the magnetic disk 10 is, for example, a CAV disk. FIG. 3 shows a second embodiment of the present invention. This example uses Z
It shows a case of ONE-CAV.

In a hard disk incorporating a ZONE-CAV formatted disk, the amount of data per track on the inner and outer circumferences is greater on the outer circumference. For this reason, if the disk control is performed in synchronization with the input signal, a vacant area is created in the outer circumference, which is wasteful. FIG. 4
FIG. 3 is a schematic diagram of a magnetic disk formatted in ZONE-CAV. FIG. 4 shows a disk consisting of three zones (A, B, C). Zone B has twice the data of zone A and zone C has three times the data of zone A.

In the second embodiment of the present invention, a ZONE interface 61 is provided. In addition, other configurations are
This is similar to the above-described embodiment. The ZONE interface 61 indicates which zone of the magnetic disk the hard disk is accessing. In the digital encoder 81 connected to the ZONE interface 61,
The operation of changing the compression rate is performed according to the contents. For example, J
In the case of systematization using the PEG coding method, the data size of the compressed image is changed by changing the value of the scale factor multiplied in the Q table. That is, in the inner zone (A in FIG. 4), the compression rate is increased to reduce the data amount, and in the outer zone, the compression rate is decreased to increase the data amount. This data is recorded on the disc.

[0035]

According to the present invention, since the rotation of the magnetic disk is synchronized with the input or output video signal, it is not necessary to have a FIFO outside the hard disk, and the system for recording video on this hard disk is: Can be constructed at low cost.

Further, since the rotation of the disc and the video are synchronized, retrieval, special reproduction, insert recording and the like can be easily performed.

In a disc having different data amounts on the inner and outer peripheries of ZONE-CAV, by compressing and coding a signal to be recorded in accordance with the data amount of each zone, the empty area can be reduced and the disc can be efficiently recorded. Further, compared to recording at a constant data rate, there is an effect that the image quality can be improved in the outer circumference. Also in this case, search and special playback,
Insert recording etc. can be performed easily.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a hard disk of the present invention.

FIG. 2 is a time chart used for explaining one embodiment of the present invention.

FIG. 3 is a block diagram of another embodiment of the present invention.

FIG. 4 is a schematic diagram of a ZONE-CAV disc.

FIG. 5 is a block diagram showing an example of a conventional hard disk.

FIG. 6 is a block diagram showing an example of a moving image recording / reproducing system using a conventional hard disk.

[Explanation of symbols]

 1 Drive Block 2 Servo Block 3 Hard Disk Controller 4 Cache Memory 5 Interface 6 External Sync Signal Input Terminal 7 Host CPU 8 Sync Signal Separation Circuit 9 Sync Signal Generation Circuit 10 Magnetic Disk 11 Magnetic Head 12 Modulator / Demodulator

Claims (9)

[Claims] 1. A magnetic disk for recording / reproducing data, a magnetic head for moving on the magnetic disk to record / reproduce data on / from the magnetic disk, and controlling the rotation of the magnetic disk while controlling the magnetic field. In a hard disk device comprising a control means for controlling reading / writing of data to a predetermined address of a disk, the rotation cycle of the magnetic disk is synchronized with a synchronizing signal of an input or output video signal. Hard disk drive characterized by. 2. The hard disk according to claim 1, wherein an access unit with the host system is synchronized with a synchronization signal. 3. A synchronizing signal of an input video signal and a reference clock are synchronized with each other,
The hard disk device according to claim 1. 4. A magnetic disk for recording / reproducing data into a zone CAV, a magnetic head for moving on the magnetic disk to record / reproduce data on / from the magnetic disk, and rotation of the magnetic disk. A hard disk device comprising a control means for controlling and reading / writing data to / from a predetermined address of the magnetic disk, having a interface showing a zone to which an access position belongs. . 5. A magnetic disk for recording / reproducing data into a zone CAV, a magnetic head for moving on the magnetic disk to record / reproduce data on / from the magnetic disk, and rotation of the magnetic disk. In a hard disk device comprising a control means for controlling to read / write data at a predetermined address of the magnetic disk, the rotation cycle of the magnetic disk is added to a synchronizing signal of an input or output video signal. A hard disk device characterized by having an interface that indicates a zone to which a position to be accessed belongs while being synchronized. 6. The hard disk according to claim 5, wherein an access unit with the host system is synchronized with a synchronization signal. 7. A synchronizing signal of an input video signal and a reference clock are synchronized with each other,
The hard disk device according to claim 5 or 6. 8. The hard disk drive device according to claim 5, wherein compression coding is performed according to the data amount of one track of each zone, and the compression coded signal is recorded. Video / audio signal recording / playback system. 9. A video / audio characterized by using the hard disk according to claim 8 to perform compression coding according to the data amount for one track of each zone and to record the compression coded signal. Signal recording / playback system.