JP2002374499A - Moving picture recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the frequency and time of waiting as small and short as possible in data transfer for recording to and reading from a recording medium. SOLUTION: The moving picture data recorded on an HDD 130 are stored in a TS input FIFO 152 and then transferred in burst to an SDRAM 151, where they are temporarily stored. Further, when a DMA write FIFO 153 becomes empty, the data are transferred in burst from the SDRAM 151 to the DMA write FIFO 153 and the transferred data are transferred to the HDD 130. In reproduction, the moving picture data read out of the HDD 130 are stored in a DMA read FIFO 154. Further, when a TS output FIFO 155 becomes empty, the data are transferred in burst from the SDRAM 151 to the TS output FIFO 155 and then transferred to TMS detection (block) 143.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving picture recording and reproducing apparatus, and more particularly to a moving picture recording and reproducing apparatus for recording and reproducing moving picture data on a predetermined recording medium.

[0002]

2. Description of the Related Art In recent years, digitalization of broadcasting has been rapidly progressing, for example, BS digital broadcasting has started, and the next CS broadcasting is scheduled to start. A characteristic of digital broadcasting is data broadcasting that can multiplex data and distribute large-volume information at high speed and all at once. In response to these, digital broadcast receivers store a variety of information data that is continuously transmitted by data broadcasting in a memory or hard disk inside the receiver, and recalls it according to viewer requests. Is being incorporated.

[0003] Such a digital broadcast receiving system will be described. FIG. 4 is a configuration diagram of a digital satellite broadcast receiving system. Radio waves transmitted from a broadcasting station via a satellite are received by a parabolic antenna 200. The received signal travels through the RF cable 300 and is
(Digital satellite broadcasting receiver: Integrated Receiver Deco
der) demodulated at 400. The demodulated signal is MPE
It is compressed by a coding method called G2, and is decoded in the IRD 400. The decoded signal is output from the AV cable 5
00 and transmitted to a television receiver (TV) 600 and output as video and audio. There is also a television receiver in which the function of the IRD 400 is incorporated. The IRD 400 can be controlled by a remote commander (hereinafter, referred to as a remote controller) 700 or the like.

[0004] The IRD 400 is a parabolic antenna 200.
Process the received signal. Here, a case will be described in which a moving image recording / reproducing device that records and reproduces a received moving image recording signal in the IRD 400 is incorporated. FIG.
3 shows an internal configuration of the RD. Each part constituting the IRD is a CP
It is controlled by the U410 via the host bus 420. For the signal QPSK modulated wave received from the parabolic antenna 200, a transmission channel of a desired band is selected by the tuner block 430, and after demodulation and error correction, a digital signal sequence is extracted. This digital signal sequence is a TS (Transport Stream),
It is passed to the descrambler 440. Streams scrambled like pay broadcasts are
The key recorded on the IC card is read out via F450 and descrambled. The descrambled stream is stored on a hard disk drive (HDD).
k Drive) sent to the controller 460 and the HDD 47
Recorded to 0. During recording and playback, the stream recorded on the HDD 470 is converted to a demultiplexer (multiplexed signal separation) 4.
Sent to 80. The demultiplexer 480 reads the stream PID (packet identification) and classifies the packets. The video and audio packets classified by the demultiplexer 480 are output to the MPEG decoder 4.
The decryption processing is performed by 90. The decoded digital video signal is further D / A (digital / analog) converted in accordance with the TV600 standard, and can be viewed through the TV600.

[0005]

However, in the conventional moving picture recording / reproducing apparatus, the transfer speed of the TS stream and the HDD
There is a problem that it is difficult to increase the transfer efficiency by absorbing the difference with the transfer speed with the controller.

For example, in the case of a personal computer,
The data size of one cluster is determined by the file system, and a relatively small unit (Windows (registered trademark))
4K to 32K bytes). At this time, since all data is read out to a certain memory area at a time to perform processing, there is no concept of a wait from the host to the HDD. That is, during that time, the host performs only the operation of writing to the memory area.

On the other hand, in a file system used in a moving image recording / reproducing apparatus, a relatively large unit of 1
Data transfer is performed in units of 28 Kbytes. Also, H
In order to absorb the bit rate difference between the UltraDMA and the TS stream by the DD controller, a synchronous DRAM (synchronous DRAM, hereinafter referred to as SDRAM) is provided therebetween, but an input area for temporarily storing data to be written to the HDD. And an output area for temporarily storing data read from the HDD are provided in one SDRAM, and the input / output operation of the TS stream must be performed in one SDRAM. SDRAM
May be provided, but problems such as an increase in I / O and an increase in cost arise. Although the data transfer speed of the SDRAM is faster than the data transfer speed of the HDD,
When three accesses have to be made to the AM, one access (Ready of HDD) is slower than the transfer speed of the HDD.

[0008] Further, in the moving picture recording / reproducing apparatus, there is a usage form in which the transmitted TS stream is recorded and reproduced. Due to such factors, in the moving image recording / reproducing apparatus, the host issues a wait to the HDD. However, if a large cache for one cluster is provided in the HDD controller in order to prevent the issuance of a wait, it is not practical because an increase in gate size may lead to an increase in cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made in consideration of a moving image in which the number of times and the time for data transfer for recording and reading data to and from a recording medium for recording moving image data can be minimized. An object of the present invention is to provide an image recording / reproducing apparatus.

[0010]

According to the present invention, there is provided a moving image recording and reproducing apparatus for recording and reproducing moving image data on a predetermined recording medium. A data storage unit having an input area for temporarily storing moving image data and an output area for temporarily storing the moving image data read from the predetermined recording medium; A first buffer for temporarily storing the moving image data to be transferred to the input area of the data storage unit in a predetermined data transfer unit of the data storage unit from a stage prior to capturing the moving image data; A second buffer for temporarily storing the moving image data transferred from the area to the predetermined recording medium in the data transfer unit; and A third buffer for temporarily storing the moving image data transferred to the output area of the storage unit in the data transfer unit, and temporarily storing the moving image data output from the output area of the data storage unit in the data transfer unit; A fourth buffer to store, the first buffer, the second
Adjusting means for adjusting the timing of writing and reading of the moving image data to the buffer, the third buffer, and the fourth buffer to control the transfer of the moving image data;
And a moving image recording / reproducing apparatus characterized by having:

In the moving picture recording / reproducing apparatus having such a configuration, the data storage means includes an input area for temporarily storing moving picture data to be recorded on a predetermined recording medium, and a moving picture data read from the predetermined recording medium. And an output area for temporarily storing In the input / output stage of the moving image in the data storage area, a first buffer, a second buffer, a third buffer, and a relatively small-scale buffer for temporarily storing moving image data in a data transfer unit of the data storage unit are provided. A fourth buffer is provided. When recording moving image data, moving image data transferred from the preceding stage of the data storage unit to the input area of the data storage unit is temporarily stored in the first buffer in a predetermined data transfer unit of the data storage unit. When the moving image data in the data transfer unit is filled, the transfer to the input area of the data storage unit is started by the adjustment unit, and the data is transferred. The data stored in the input area of the data storage unit is transferred to the second buffer, and when the moving image data of the data transfer unit is filled, the data is transferred to a predetermined recording medium by the adjustment unit and recorded. When playing back moving image data,
The moving image data read from the predetermined recording medium is the third moving image data.
When the moving image data in the data transfer unit is filled, the transfer to the output area of the data storage unit is started by the adjusting unit, and the data is transferred. The data stored in the output area of the data storage unit is transferred to the fourth buffer, and when the moving image data in the data transfer unit is filled, the data is transferred to the next stage by the adjustment unit.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. A moving image recording / reproducing apparatus according to an embodiment of the present invention receives an MPEG2 TS packet (hereinafter simply referred to as a TS packet) transmitted from a broadcasting station via a satellite, and has a TS packet therein. HDD
Recorded on the HDD as necessary.
The processing of the storage system for reproducing the S packet is performed. The reception and storage processes, that is, the recording and playback processes, can operate simultaneously. For example, reproduction can be performed while recording.

An HDD and an HDD control block for controlling recording and reproduction using the HDD will be described. FIG.
1 is a configuration diagram of an HDD control block and an HDD of a moving image recording / reproducing apparatus according to an embodiment of the present invention.

HDD for a moving picture recording / reproducing apparatus according to the present invention
The control block includes a recording control system for recording the TS packets input from the descrambler into the HDD 130, a reproduction control system for extracting the TS packets recorded on the HDD 130 during reproduction, and an HDD controller 120 for controlling writing and reading to and from the HDD 130. And is composed of

The recording control system includes a PID filter 111 for filtering an input TS packet, and a packet FI.
The FO 112 includes a TMS addition (block) 113 for recording the arrival time (TMS) of a TS packet, an input FIFO 114 for absorbing a transfer speed difference, and an index addition (block) 115 for adding an index to a packet.

The TS packet entering the HDD control block is filtered by the PID filter 111,
The packet is sent to the TMS addition (block) 113 via the packet FIFO 112. TMS addition (block) 1
In step 13, the TMS of the TS packet is recorded, and the TMS is added to each TS packet to define it as one packet. The TS packet to which TMS is added is input FIFO
Then, the difference between the TS stream and the transfer speed of the HDD controller 120 is absorbed. To some extent, TS
When the packets have accumulated, the HDD controller 12
Data is transferred from 0 to the HDD 130 by DMA transfer. At the time of DMA transfer, in the index addition (block) 115, index information such as a position on the HDD 130 to be recorded is similarly stored in the HD 130.
D130.

The reproduction control system comprises an index detection (block) 141 for removing an index, an output FIFO 142 for absorbing a difference in transfer speed, a TMS detection (block) 143 for detecting TMS, and an output packet FIFO 144 for filtering. The output packet FIFO 144 includes a selection unit that performs filtering for selecting and outputting only a specific packet, and a replacement unit that replaces a cyclic counter of the selected packet as necessary.

When data is read from the HDD 130 during normal reproduction, the HDD controller 120
The transfer transfers the data to the output FIFO 142. Some of the data read by DMA transfer include
Since the data added in the index addition (block) 115 is mixed, these data are removed in the index detection (block) 141. Output F
The IFO 142 absorbs the difference between the transfer rates of the TS stream and the HDD controller 120 as in the input FIFO 114. The data stored in the output FIFO 142 is T
The packet is sent to the MS detection (block) 143 to detect the TMS added to each TS packet, and the remaining TS data is sent to the output packet FIFO 144. And
With reference to the value of TMS, only filtered TS packets are output and transferred to the demultiplexer.

The SDRAM control unit 150 includes the HDD 130
The transfer of TS packet data to an input FIFO 114, which is an input area for temporarily storing TS packets to be recorded in the HDD, and an output FIFO 142, which is an output area for temporarily storing TS packets read from the HDD 130, is controlled. Input FIFO 114 and output FIFO 142
Is composed of an SDRAM, and is usually provided on a common SDRAM. The input FIFO 114 and the output FIFO 142 are separated by switching banks. For this reason, the input FIFO 114 and the output FIFO 142 cannot be accessed simultaneously.

For example, TMS addition (block) 1
The maximum bit rate of a TS stream input from the input FIFO 114 to the input FIFO 114 is about 30 Mbps / s,
The bit rate of the TS stream output from the output FIFO 142 to the TMS detection (block) 143 is also about 30 at the maximum.
Mbps / s. On the other hand, the transfer bit rate between the HDD controller 120 and the HDD 130 is Ul
In the case of using traDMA, the transfer rate is 33 MByte / s, which is higher than the transfer speed of the input FIFO 114 and the output FIFO 142. Due to the difference in transfer speed, HDD 130
, A weight is generated.

For this reason, the SDRAM control unit 150
A small-scale FIFO is incorporated in the input / output stage of the SDRAM interface that transfers data to the input FIFO 114 and the output FIFO 142, and controls data transfer so as to absorb the difference in transfer speed.

The SDRAM control unit 150 will be described. FIG. 2 is a block diagram of an SDRAM control unit in the moving image recording and reproducing apparatus according to one embodiment of the present invention.
The same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

The SDRAM control unit according to the present invention comprises an SDRAM 151 serving as a data storage unit, an input FIFO 114
TS input F, which is the first buffer provided in the input stage of
An FIFO 152, a DMA write FIFO 153 serving as a second buffer provided at an output stage of the input FIFO 114;
DMA read FIFO 154 serving as a third buffer provided at the input stage of output FIFO 142, output FIFO 1
It comprises a TS output FIFO 155 as a fourth buffer provided at the 42 output stage and an arbiter 156 as adjustment means for adjusting between the FIFOs.

TS input FIFO 152, DMA write F
The IFO 153, the DMA read FIFO 154, and the TS output FIFO 155 are small-scale FIFOs that can temporarily store moving image data for a data transfer unit for performing burst transfer to the SDRAM 151. Hereinafter, these FIFOs are collectively called a small FIFO. When the burst transfer to the SDRAM 151 is performed in eight words, it is necessary to prepare at least eight stages for each FIFO. If there is an empty space for 8 words in each small FIFO, or if the space becomes full for 8 words, SD
A burst transfer start signal to the RAM 151 is issued.

The TS input FIFO 152 accumulates the moving image data input from the TMS addition (block) 113, and when it is filled with 8 words, the SDRAM 15
A request for activating data transfer to No. 1 is issued. A command is issued to the SDRAM 151 from the arbiter 156 receiving the command. Thus, the moving image data stored in the TS input FIFO 152 is transferred to the input FIFO of the SDRAM 151.
Transferred to FO114.

The DMA write FIFO 153 has an input FI
The data to be transferred from the FO 114 to the index addition (block) 115, that is, the data to be recorded in the HDD 130, is stored, and the data is transferred to the index addition (block) 115. When the transfer is completed and a space for eight words is generated, a start request for data transfer is issued to the SDRAM 151. Arbiter 156 that received it S
A command is issued to the DRAM 151. As a result, the moving image data is stored in the input FIFO of the SDRAM 151.
114 to the TS input FIFO 152.

The DMA read FIFO 154 accumulates data transferred from the index detection (block) 141, that is, data read from the HDD 130,
When eight words are filled, a start request for data transfer to the SDRAM 151 is issued. A command is issued to the SDRAM 151 from the arbiter 156 receiving the command. As a result, the moving image data stored in the DMA read FIFO 154 is output to the output FIFO of the SDRAM 151.
Transferred to FO142.

The TS output FIFO 155 is connected to the SDRAM 1
The data transferred from the output FIFO 142 is stored and output to the TMS detection (block) 143.
When the transfer is completed and there is an empty space of 8 words, SDRA
It issues a data transfer activation request to M151. A command is issued to the SDRAM 151 from the arbiter 156 receiving the command. As a result, the moving image data becomes SDRA
M151 output FIFO 142 to TS output FIFO1
55.

The arbiter 156 receives a start request from each FIFO, issues a command to the SDRAM 151 in response to the request, and controls data transfer. The operation of the SDRAM control unit of the moving picture recording / reproducing apparatus having such a configuration will be described.

At the time of recording on the HDD 130, the moving image data of the TS packet flowing from the TMS additional block (113) is stored in the TS input FIFO 152. T
When eight words of data are accumulated in the S input FIFO 152, a data transfer activation request is issued. The arbiter 156 receiving this issues a command to the SDRAM 151, and the data stored in the TS input FIFO 152 is burst-transferred to the SDRAM 151. HDD13
Recording to 0 is performed via the DMA write FIFO 153. When the DMA write FIFO 153 becomes empty, a data transfer activation request is issued. Arbiter 156
A command is issued to the SDRAM 151 and the SDRA
Data is burst-transferred from M151 to DMA write FIFO 153. The data stored in the DMA write FIFO 153 is added with an index (block) 115.
Transferred to

At the time of reproduction, the moving image data read from the HDD 130 is stored in the DMA read FIFO 154. When data of eight words is accumulated in the DMA read FIFO 154, a data transfer activation request is issued. The arbiter 156 that received this SDRAM 151
To the DMA read FIFO 15
2 is burst-transferred to the SDRAM 151. The output to TMS detection (block) 143 is
This is performed via the TS output FIFO 155. TS output F
When the IFO 155 becomes empty, a data transfer activation request is issued. The arbiter 156 issues a command to the SDRAM 151, and issues a TS output F from the SDRAM 151.
Data is burst-transferred to IFO 155. The data stored in the TS output FIFO 155 is transferred to the TMS detection (block) 143.

Next, the adjustment process performed by the arbiter 156 will be described. The arbiter 156 is composed of a round-robin state machine, and the transfer of each small FIFO is also composed of a lower-layer state machine. FIG. 3 is a configuration diagram of the arbiter state machine. Here, an operation in the case of executing delayed play in which reproduction is performed while recording will be described.

To perform reproduction while recording, the HDD 1
Writing and reading to 30 are required in parallel,
Writing to and reading from the HDD 130 cannot be performed simultaneously.

At the time of writing to the HDD 130,
Reading from 130 is prohibited, and arbiter 156
Are the state (S0) of data transfer by the DMA write FIFO 153, the state (S1) of data transfer by the TS output FIFO 155, and the TS input FIFO 152
The data transfer state (S2) and the data refresh state (S3) are executed in a round-robin manner. Here, the data refresh state (S3) is infrequent and the cycle can be ignored to consider the transfer rate, so that it is omitted in the following description.

In the state (S0) of data transfer by the DMA write FIFO 153, data is burst-transferred from the input FIFO 114 of the SDNRAM 151 to the DMA write FIFO 153. In the state (S1) of data transfer by the TS output FIFO 155, the SDRAM 1
51 output FIFO 142 to TS output FIFO 155
, Ie, reading. TS
The state of the data transfer by the input FIFO 152 (S
In 2), from the TS input FIFO 152 to the SDRAM 15
Data transfer to the input FIFO 114, that is, writing is performed.

When reading from the HDD 130, writing to the HDD 130 is prohibited, and the arbiter 156 determines the state of data transfer by the DMA read FIFO 154 (S0), the state of data transfer by the TS output FIFO 155 (S1), and Input FIFO
The state of the data transfer state (S2) 152 and the state of refreshing the data (S3) are executed in a round robin manner.

In general, the time required for data access to the HDD is determined by the access time from when a command is issued to the HDD until data transfer is actually started and the transfer time for actually transferring data. Since the access time depends on the HDD manufacturer, there is no other way but for the transfer time, the maximum performance can be obtained depending on how the system is made. According to this system, since the access to the SDRAM can be remarkably improved by performing a burst access rather than a single access, the SDR can be improved.
A small FIFO was placed around the AM interface.
Thus, small F around the SDRAM interface
By disposing the IFO, the difference between the data transfer speed of the SDRAM and the data transfer speed of the HDD can be absorbed, and as a result, the number of times or the time of waiting for the HDD can be reduced.

In the above description, the size of the small FIFO is eight words (eight stages), which is the size of the burst transfer with the SDRAM. However, the number of stages can be increased to twice (16 stages). In the case of 16 stages, data transfer with other parts is possible even in a state where burst transfer is occurring, so that data transfer efficiency can be further improved. As a result, for example, the number or time of waits for data transfer with the HDD, which is faster than SDRAM data transfer such as UltraDMA transfer, can be reduced as much as possible. Of course, it is possible to make the number of steps deeper. As described above, by increasing the number of stages of the small FIFO, it is possible to transfer 33 MB of data to and from the HDD.
yte / s as much as possible.

[0039]

As described above, in the moving picture recording / reproducing apparatus of the present invention, moving picture data is recorded on a predetermined recording medium via data storage means divided into an input area and an output area. . When recording moving image data, a relatively small buffer provided at the input / output stage in the input area of the data storage means absorbs the difference between the data transfer speed to the specified storage medium and the data transfer speed to the data storage means. I do.
When reproducing moving image data, a relatively small buffer provided at the input / output stage of the output area of the data storage means uses a relatively small buffer to determine the difference between the data transfer rate from the predetermined recording medium and the data transfer rate from the data storage means. Absorb.

As described above, by arranging a relatively small buffer at the input / output stage of the data storage area, the data transfer speed when moving image data is input / output from a predetermined recording medium, and the data storage speed lower than this. By absorbing the difference from the data transfer speed when inputting / outputting moving image data from / to, it is possible to minimize the number of times or time for waiting for data transfer with a predetermined recording medium. As a result, it is possible to improve the efficiency of data transfer inside the moving image recording / reproducing apparatus.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an HDD control block and an HDD of a moving image recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of an SDRAM control unit in the moving image recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 3 is a configuration diagram of an arbiter state machine.

FIG. 4 is a configuration diagram of a digital satellite broadcast receiving system.

FIG. 5 is a diagram showing an internal configuration of an IRD.

[Explanation of symbols]

111: PID filter, 112: Packet FIF
O, 113 ... TMS addition (block), 114 ... input FIFO, 115 ... index addition (block),
120: HDD controller, 130: HDD, 14
1 ... Index detection (block), 142 ... Output F
IFO, 143 ... TMS detection (block), 144 ...
Output packet FIFO, 150 ... SDRAM control unit,
151 SDRAM, 152 TS input FIFO, 1
53 DMA write FIFO, 154 DMA read FIFO, 155 TS output FIFO, 156 arbiter

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // H04N 7/24 H04N 7/13 Z F term (Reference) 5C053 FA20 FA23 GA11 GB06 GB38 HA33 JA21 KA04 KA11 KA24 5C059 KK34 RB02 SS11 TA00 TA80 TC15 TD12 UA02 UA05 UA34 UA35 UA38 5D044 AB07 BC01 BC08 CC05 DE12 DE40 EF03 EF05 GK12 HH07

Claims (4)

[Claims] 1. A moving image recording and reproducing apparatus for recording and reproducing moving image data on a predetermined recording medium, comprising: an input area for temporarily storing the moving image data to be recorded on the predetermined recording medium; A data storage unit including an output area for temporarily storing the moving image data read from a recording medium; and an input area of the data storage unit from a stage prior to capturing the moving image data recorded on the predetermined recording medium. A first buffer for temporarily storing the moving image data transferred to the data storage unit in a predetermined data transfer unit, and the moving image data transferred to the predetermined recording medium from an input area of the data storage unit A second buffer for temporarily storing data in the data transfer unit, and the moving image data transferred from the predetermined recording medium to an output area of the data storage unit. A third buffer for temporarily storing the data in the data transfer unit, a fourth buffer for temporarily storing the moving image data output from the output area of the data storage unit in the data transfer unit, the first buffer, Adjusting means for adjusting the timing of writing and reading the moving image data to the second buffer, the third buffer, and the fourth buffer to control the transfer of the moving image data. Video recording and playback device. 2. The moving picture recording / reproducing apparatus according to claim 1, wherein the predetermined data transfer unit is at least a data size unit for performing burst transfer. 3. The first buffer, the second buffer,
2. The moving picture recording / reproducing apparatus according to claim 1, wherein the third buffer and the fourth buffer further temporarily store the moving picture data of an integral multiple of the predetermined data transfer unit. 4. The moving picture recording / reproducing apparatus according to claim 1, wherein said adjusting means comprises a round robin state machine.