JP2000149425A - Disk device and receiving device - Google Patents

Abstract

(57) [Summary] [Problem] To realize a disk device and a receiving device that can record both continuous data having continuity such as video and audio and system data that needs to be frequently accessed, and have a simple configuration. . SOLUTION: Video data is stored in a time stamp adding section 44.
The time stamp is added by the
Is input to CP on the position A side of the switch 49
The system data from U51 is supplied. The controller 47 controls the switch 49 and monitors the data accumulation state of the FIFO memory 46.
6 before the video data is full, the switch 49 is connected to the position B side and the video data is transferred to the hard disk drive 4.
Send to 5. The hard disk 56 is divided into a video data area and a system data area. When recording video data, recording is performed in the order of sector addresses.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device and a receiving device, and more particularly to a disk device for recording and reproducing continuous data such as audio data and video data and system data, and a receiving device for receiving the data. Related to the device.

[0002]

2. Description of the Related Art In recent years, with the development of multimedia, audio data and video data of moving images have been recorded not only on tapes but also on disk-shaped recording media such as hard disks. These data are stored in HTML (Hyper
It is recorded with system data such as Text Markup Language) and programs.

When a hard disk is used as a recording medium for a computer, frequent rewriting of system data occurs, so that the possibility of continuous recording in the circumferential direction of the disk is low and the data is often recorded in a fragmentary manner. . On the other hand, a relatively large amount of continuous data such as video data which must be recorded at a constant transfer rate is recorded in pieces, so that the number of accesses increases and the transfer rate cannot be guaranteed.

Therefore, in order to record video data together with system data that is frequently accessed, a disk drive capable of high-speed recording is used, or two disk drives are prepared for system data and video data, and different controls are performed. Or dividing the data wiring into another disk. However, in such a case, there has been a disadvantage that the device becomes complicated or large.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a disk apparatus having a simple structure capable of recording both continuous data such as video and audio data and system data which needs to be frequently accessed, and a simple structure. It is an object to realize a device.

[0006]

According to a first aspect of the present invention, there is provided a disk apparatus for recording system data and continuous data having a constant transfer rate on a disk-shaped recording medium. A disk storage unit in which a system data recording area for recording system data and a continuous data recording area for recording continuous data are separated,
A time information adding unit that adds time information to the continuous data; and a continuous data supply unit that supplies output data of the time information adding unit to the disk storage unit so as to record the output data in the order of addresses of the continuous data recording area. I do. The system data refers to data from a program, HTML, a digital camera, or the like.

According to a second aspect of the present invention, in the disk device, the continuous data supply unit includes a temporary storage unit for temporarily storing input data, and system data and a continuous data based on the amount of data stored in the temporary storage unit. A control unit that supplies one of the data to the disk storage unit.

[0010] The disk device according to a third aspect is characterized in that before recording the continuous data, a file arrangement table of the continuous data is recorded.

A receiving apparatus according to a fourth aspect of the present invention includes a disk storage unit in which a system data recording area for recording system data and a continuous data recording area for recording continuous data are separated, and a receiving unit for receiving an external signal. A time information adding unit for adding time information to the output data of the receiving unit, a temporary storage unit for temporarily storing the output data of the time information adding unit, and a data amount stored in the temporary storage unit. A control unit that supplies one of system data and continuous data to a disk storage unit and supplies the output data of the temporary storage unit to the disk storage unit so as to record the output data of the temporary storage unit in the address order of the continuous data recording area; A time information removing unit that converts the continuous data stored in the storage unit into a format before adding the time information based on the time information. The receiving device includes a transmitting / receiving device capable of transmitting, a set-top box, and an IRD (Intelligent Re
and all devices having a receiving function, such as a device for outputting a signal to another device.

[0010] The operation of the above means is that the storage area of the disk storage section is separated from the system data recording area for recording system data and the continuous data recording area for recording continuous data. Data transfer rates during recording and reproduction are guaranteed. Further, since time information is added to continuous data by the time information adding unit, it is not necessary to perform time control during reproduction, and continuous data can be restored.

The continuous data supply unit has a temporary storage unit and a control unit, and determines which of system data and continuous data is to be supplied to the disk storage unit based on the amount of data stored in the temporary storage unit. Since the determination is made, continuous data can be recorded without interruption while recording the system data, and the temporary storage unit can be realized with a small-scale configuration. Therefore, simultaneous access of system data and continuous data becomes possible as a disk device.

Further, by recording the file arrangement table of the continuous data before recording the continuous data, it is not necessary to record the file arrangement table of the continuous data during the recording of the continuous data. Time can be saved, and the data transfer rate of input / output of the disk storage unit is guaranteed.

A receiving device incorporating such a disk device records an external signal received by a receiving unit and converts the signal into an original format at the time of reproduction based on added time information. A function of storing and reproducing a received signal while recording or reproducing data can be realized with a small-scale configuration.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The disk device of the present invention is used not only as a storage device of a computer by itself, but also for a set-top box for television broadcasting, a receiving device such as an IRD, or other video equipment or audio equipment. Among them is available. 1 to 5 show an embodiment of the present invention.
This will be described with reference to FIG.

Although a description will be given of an apparatus using a hard disk as an example of a disk apparatus, the present invention is not limited to this, and an apparatus using another disk such as an optical disk, a magneto-optical disk, or a floppy disk may be used. . Also, video data will be described as an example of continuous data, but the present invention is not limited to this. Data that is continuously transmitted at a fixed transfer rate, such as audio data, or data in which video data and audio data are combined Such data may be a composite of continuous data.

First, the area arrangement of the hard disk drive used in the embodiment of the present invention will be described. The recording areas for the video data and the system data are arranged separately.
FIG. 1 is a diagram showing an area division between video data and system data of a hard disk device. Although the hard disk is shaped like a cylinder in FIG. 1, it is often composed of a number of disks, so the disk for recording video data and the disk for recording system data are separated. To

Further, it is also possible to adopt a form in which one disk is divided into regions in the diameter direction. FIG. 2 is a diagram showing a case where an area for recording video data and an area for recording system data are separated in the diameter direction. Sector numbers are assigned from the inner circumference to the outer circumference of the disk, and the shaded portion in FIG. 2 is a video data area from sector address 1 to sector address 24, and a system data area from sector address 25 to sector address 40. .

As described above, by separating the continuous data such as a video signal and the system data such as a program in advance, no seek occurs in the hard disk device during the recording of the continuous data, and the input / output transfer rate of the hard disk device is guaranteed. You.

Next, an embodiment using such a hard disk device will be described. FIG. 3 shows a disk drive according to an embodiment of the present invention in an MPEG (Moving Picture Experts Groove).
up) is a block diagram of a case where the image is realized in a set-top box that receives two images.

First, the recording side will be described. Antenna 41
Are input to the set-top box 42 by the tuner & demultiplexer 43 and output as video data in the MPEG2 video data format. Tuner &
The demultiplexer 43 also has a function such as a descrambler for restoring the scrambled signal.

This video data is sent to a time stamp adding section 4
4, a time stamp as time information is added.
This time stamp is used to restore the time axis to the state before recording at the time of reproduction because the time axis is changed when the time stamp is recorded on the hard disk device 45 and reproduced. The time stamp adding unit 44 includes, for example, a timer and a multiplexer, but is not limited thereto.

The video data to which the time stamp has been added is input to a FIFO (First In First Out) memory 46. The input and output of the FIFO memory 46 are controlled by a controller 47. The output of the FIFO memory 46 is supplied to a switch 48. The FIFO memory 46 may be any storage means having a function of outputting data in the order of incoming data, and does not need to be a dedicated single element.

A switch 48 is a switch for switching between recording and reproduction. The FIFO memory 46 and the switch 49 are connected during recording, and the FIFO memory 50 and the switch 49 are connected during reproduction. The switch 48 is controlled by the CPU 51.

The switch 49 switches communication between video data and the hard disk device 45 or communication between the CPU 51 and the hard disk device 45. The system data is stored in the system memory 52, and the CPU 51 inputs the system data from the system memory 52 and supplies the system data to the switch 49.

The switch 49 is controlled by the controller 47, and sends video data from the FIFO memory 46, or system data or a control signal from the CPU 51 to the hard disk device 45 during recording. The switch 49 is also controlled by a signal from the CPU 51 through the controller 47. The CPU 51 manages the hard disk device 45 and controls seek, recording, and reproduction to a specified sector address.

The hard disk drive 45 includes an input / output interface unit 53, a cache memory 54 for storing input data or reproduced data, and a controller 5.
5 to record or reproduce on the hard disk 56. This configuration is as described above.

Next, the reproducing side will be described. The system data and video data recorded on the hard disk device 45 are
The switch 49 sends the system data to the CPU 51 side.
The video data is sent to the switch 48 side. Since the CPU 51 knows whether the next data is the system data or the video data, the controller 47 that has received the signal from the CPU 51 switches the switch 49 correctly.

The switch 48 is controlled to the reproducing side by the CPU 51, and the video data is stored in the reproducing FIFO memory 50. The input / output of the FIFO memory 50 is controlled by the controller 47. This FIF
The O memory 50 is required separately from the FIFO memory 46 for an application such as time lag transmission in which different data is reproduced while recording and output to the outside of the apparatus, but if there is no such application, the recording FIFO is required.
A form that also serves as the memory 46 is also possible.

The video data stored in the FIFO memory 50 is restored to the original continuous MPEG2 video data from which the time stamp has been removed by the time stamp removing unit 57 and sent to the switch 58. Switch 58 is a CPU
Controlled by the tuner & demultiplexer 4
3 or the reproduced MPEG2 video data from the time stamp removing unit 57 is sent to the decoder 59.

The decoder 59 decodes the MPEG2 video data and converts it into a format that can be output to the monitor 60. The output of the decoder 59 is converted to an analog signal by a D / A converter 61 and output to an external monitor 60. If the external monitor 60 has a digital interface, the D / A converter 61 is unnecessary. If the device to be connected to the outside is a device for directly inputting MPEG2 video data, the decoder 59 is not necessary, and the MPEG2 video data may be output as it is.

Further, if it is not necessary to directly output the input MPEG2 video data from the tuner & demultiplexer 43, and if the set-top box is configured such that the received signal is always recorded on the hard disk device 45 and then output,
The switch 58 is also unnecessary.

An example of the operation of the controller 47 at the time of recording and the method of determining the size of the FIFO memory 46 in such a set-top box will be described.

The controller 47 has a FIFO memory 46
And the switch 49 is controlled. Normally, the switch 49 is connected to the position A by a command from the CPU 51 so that the system data is recorded in the hard disk device 45, but the data accumulation state of the FIFO memory 46 is monitored. And FIF
In order to prevent the MPEG-2 video data from overflowing into the O memory 46, the switch 49 is connected to the position B side before the FIFO memory 46 becomes full, and the video data is sent to the hard disk device 45.

In order to perform such control, the memory size of the FIFO memory 46 must be equal to or larger than the required size. The required size will be described in detail with reference to FIG. FIG. 4 is a timing chart showing the relationship between the access of the system data and the video data to the hard disk device and the input data of the FIFO memory.

After the video data in the FIFO memory 46 becomes empty, a seek is made to a system data recording area to record system data at t1, and system data for one sector is recorded. At t2, a seek is performed to record the video data again, and the video data stored in the FIFO memory 46 is recorded from t1 to t4.

For this recording, the video data is from t1 to t
In addition to the input data of the FIFO memory 46 up to 3,
The input data of the FIFO memory 46 from t3 to t4 is required, and the FIFO memory 46 needs a size enough to store the input data without overflowing.

The maximum transfer rate in the input / output interface unit 53 is Ra (byte / sec), the maximum access time of the hard disk is Tb (msec), the sector size of the hard disk is Sc (byte), and the MPEG2 from the time stamp adding unit 44 is used. Set the transfer rate of video data to Rm (bit / sec
Assuming that the minimum hard disk access size is one sector size and the system data is within one sector size, the time Tsd (mse
Since c) is the sum of the time for recording one sector and the maximum access time for two times, Equation 1 is obtained. Tsd = Sc / Ra × 10 ³ + Tb × 2 (1)

The size of the FIFO memory 46 is determined by the time Ts
d) the amount of MPEG2 video data transferred during
Since the amount of MPEG2 video data newly transferred within the time Tav from 3 to t4 is required, the equation 2 is obtained. (FIFO memory size) = (Tsd + Tav) × 10 ⁻³ × Rm (2)

Tav is calculated as in Equations 3 and 4. Tav = Tsd × (Rm / Ra + (Rm / Ra) ² + (Rm / Ra) ³ +... + (Rm / Ra) ⁿ + ...) (3)

(Equation 1)

For example, Ra = 10M (byte / sec), T
When b = 20 (msec) and Sc = 512 (byte),
Substituting into equation 1, Becomes

Using this result, Rm = 10M (bit / se
c) is substituted into Equation 3 and an approximate calculation yields Tav ≒ 5
(Msec). When these Tsd and Tav are substituted into Equation 2, the required size of the FIFO memory is calculated as follows. (Size of FIFO memory) = (40 + 5) × 10 ⁻³ × 10M = 450 × 10 ³ (byte) = 450 (Kbyte)

The reason for this calculation is that the recording area of the hard disk for recording the video data is separated from the area for recording the system data and is continuous, so that a seek occurs during the recording of the video data. Without, Tav
Is not longer than the scheduled time.
That is, the input rate of the input / output interface unit 53 during the transfer of the video data is guaranteed. Therefore, if the necessary size of the FIFO memory 46 is determined by calculation, it is guaranteed that video data is recorded without dropping frames.

The operation of the controller 47 during reproduction and the method for determining the size of the FIFO memory 50 are the same as those on the recording side. MPEG2 output from FIFO memory 50
The video data must be supplied from the hard disk device 45 to the FIFO memory 50 so that the video data is not interrupted. Therefore, it is necessary to access the system data, return to the video data, and accumulate data for the read time.
The required size of 0 is determined.

Next, FAT (File Allocation Table)
The recording method will be described. The FAT is a type of file layout table, and records the next sector address when recording data of one sector size or more.
Generally, this sector address tends to be random, and the FAT is recorded in a predetermined area every time data is recorded.

In the present apparatus, the recording area of the video data is fixed, and it is determined that the video data is to be recorded continuously. Therefore, the next sector address is always determined. Therefore, when the FAT is used, a sector address can be written in the FAT in advance for video data.

Therefore, when the system data FAT and the video data FAT are separately provided, the video data FAT need only be written once before the start of recording. For example, when the recording area of the video data is 2 hours, the M
In the case of recording PEG2 video data, it is only necessary to write the “END” mark once at the FAT location indicating the sector address 30 minutes later before the start of recording.

FIG. 5 shows the FA of the hard disk shown in FIG.
FIG. 4 is a diagram illustrating an example of T. In FIG. 5, sector address 1
To 5 indicate a block of video data. After that, the mark “END” indicates that the processing ends here. As for system data, sector addresses 26, 34 and 39 are written at random.

As described above, the FAT can be recorded in the same manner as the normal system data, and the FAT of the video data can be recorded.
The AT can be directly accessed from the CPU 51, and the CPU 51 can recognize the AT.

The use mode in the set-top box for receiving the broadcast video signal has been described above. The set-top box for receiving the audio signal together with the multimedia signal for receiving the signal from the Internet via the IRD and the telephone line The present invention is also applicable to other devices that need to record continuous data having a constant transfer rate such as video data and audio data, and system data such as data from an HTML, a program, or a digital camera, such as a device for use in the present invention. Obviously, is available.

[0050]

According to the disk apparatus of the present invention, continuous data such as video data and audio data is recorded on a general disk apparatus together with system data having a large number of random accesses without losing the continuity. It becomes possible. Therefore, a particularly high-performance disk device is not required. Further, the continuous data can be recorded not in a specially formatted block but in a block that handles ordinary system data, thereby improving convenience.

Also, the disk device of the present invention can be built in various devices, and if built in a receiving device, it can be used in a small-scale configuration and in a state where continuity of a received video signal or audio signal is guaranteed. Thus, recording and reproduction can be performed on the disk together with the system data.

[Brief description of the drawings]

FIG. 1 is a diagram showing an area division between video data and system data of a hard disk device.

FIG. 2 is a diagram showing a case where an area for recording video data and an area for recording system data are separated in a diameter direction.

FIG. 3 shows a disk drive according to an embodiment of the present invention as an MP.
It is a block diagram in the case of realizing in the set top box which receives the image of EG2.

FIG. 4 is a timing chart showing a relationship between access of system data and continuous data to a hard disk device and input data of a FIFO memory.

FIG. 5 is a diagram illustrating an example of a FAT.

[Explanation of symbols]

1 to 40: sector address, 41: antenna, 42: set-top box, 43: tuner & demultiplexer, 44: time stamp adding unit, 45: hard disk drive, 46: FIFO memory, 47: controller,
48, 49: switch, 50: FIFO memory, 51:
CPU, 52: System memory, 53: Input / output interface unit, 54: Cache memory, 55: Controller, 56: Hard disk, 57: Time stamp removing unit, 58: Switch, 59: Decoder, 60: Monitor, 61: D / A converter

Claims (4)

[Claims] 1. A disk apparatus for recording system data and continuous data having a constant transfer rate on a disk-shaped recording medium, comprising: a system data recording area for recording the system data; and a continuous data recording area for recording the continuous data. A time information adding unit that adds time information to the continuous data; and the disk storage unit that records output data of the time information adding unit in the order of addresses of the continuous data recording area. A continuous data supply unit for supplying the data to the disk device. 2. The method according to claim 1, wherein the continuous data supply unit includes: a temporary storage unit that temporarily stores input data; and a data amount stored in the temporary storage unit.
The disk device according to claim 1, further comprising: a control unit that supplies one of the system data and the continuous data to the disk storage unit. 3. The disk device according to claim 1, wherein a file layout table of the continuous data is recorded before recording the continuous data. 4. A disk storage unit in which a system data recording area for recording system data and a continuous data recording area for recording continuous data are separated, a receiving unit for receiving an external signal, and an output of the receiving unit. A time information adding unit that adds time information to data, a temporary storage unit that temporarily stores output data of the time information adding unit, and a data amount stored in the temporary storage unit.
A control unit that supplies one of the system data and the continuous data to the disk storage unit and supplies the output data of the temporary storage unit to the disk storage unit so as to record the output data in the order of addresses of the continuous data recording area A time information removing unit that converts continuous data stored in the disk storage unit into a format before adding the time information based on the time information.