JP3153490B2 - Recording / reproducing apparatus and recording / reproducing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for dividing multimedia data such as video data and audio data, recording the divided data on a plurality of data recording apparatuses, and reproducing the streams by reading them out in parallel. It relates to a recording / reproducing method.

[0002]

2. Description of the Related Art An audio-video server device is a VOD server.
(Video On Demand) Used for broadcasting and the like, and distributes a title such as a movie for each channel of multiple channels that can be transmitted in response to a request from a user or the like. The audio / video server device is constituted by a recording / reproducing device provided with a data recording device such as a hard disk device. This recording / reproducing apparatus accumulates multi (continuous) media data such as video data and audio data constituting the above-mentioned title, and reproduces the stream as a stream (data string). Further, in a recording / reproducing device, a plurality of hard disk devices are generally used as a data recording device in order to immediately respond (distribute) to various requests in real time. Furthermore, in the recording / reproducing apparatus, since an independent stream is read in response to a plurality of requests, a very large internal transfer band and data recording exceeding the I / O (input / output) performance of a single hard disk drive are required. Device I
/ O band is required. Therefore, in the recording / reproducing device, a plurality of hard disk devices constitute a disk array device, and the multimedia data is divided and arranged and held by a striping arrangement method. In such a recording / reproducing device, by performing interleaved reading (sequential reproduction) from each hard disk device in the reading operation, the load is concentrated on a specific hard disk device even when distribution is requested from a plurality of channels. Has been prevented.

Next, a conventional recording / reproducing apparatus will be specifically described. First, a conventional recording / reproducing device using a single hard disk device as a data recording device will be described with reference to FIGS. 10, 11, and 12. FIG. FIG.
FIG. 4 is an explanatory diagram showing an example of digital data arrangement in a conventional recording / reproducing device using a single hard disk device as a data recording device. FIG. 11 is an explanatory diagram showing a configuration of a reading period in the hard disk device shown in FIG. FIG.
FIG. 11 is an explanatory diagram showing an operation when digital data is continuously read in the hard disk device shown in FIG. 10. As shown in FIG. 10, for example, a series of frames 1 to 6 (shown by numerals 1 to 6 in the figure) of video data are stored in the hard disk device 51. Each of frames 1 to 6 of this video data is obtained by a predetermined readout period T.
It is read from the hard disk drive 51. As shown in FIG. 11, the read period T has four periods TA and T.
B, TC and TD. The period TA is a period during which a READ (read) request is transferred to the hard disk device 51, and the period TB is a period from when the head of the hard disk device 51 is sought to when the head reaches the track specified by the READ request. is there. The period TC is a period during which the recording medium of the hard disk device 51 rotates, waits for rotation until the desired video data located on the track is read out by the head, and reads out.
The period TD is a period during which the read video data is actually transferred. In the single hard disk drive 51, for example, NTSC (National Television System Committe
In the case of reproducing the video data of the e) method, it is necessary to read the video data of 30 frames per second by performing the read operation shown in FIG. 11 30 times per second. In FIG.
Periods T1 to T6 correspond to frames 1 to 6 of the video data (FIG. 1).
0) indicates the readout period. Each of these periods T1 to T6 is equal to the readout period T shown in FIG. Therefore, the single hard disk drive 51 needs at least six times the readout period T for one frame to read out video data for six consecutive frames.

Next, a conventional recording / reproducing apparatus using a plurality of hard disk devices as a data recording apparatus will be described with reference to FIG.
This will be described with reference to FIG. In the following description,
For the sake of simplicity, descriptions of known configurations such as a unit for distributing and writing digital data to a plurality of hard disk devices and a unit for reading digital data, reproducing it as a stream and outputting it to a user or the like are omitted. I do. FIG. 13 is an explanatory diagram showing an example of digital data arrangement in a conventional recording / reproducing device using a plurality of hard disk devices as a data recording device. FIG. 14 is an explanatory diagram showing an operation in the case of reading a plurality of digital data from the plurality of hard disk devices shown in FIG. 13 in parallel. FIG.
As shown in FIG. 3, the conventional recording and reproducing apparatus is provided with six hard disk devices 61 to 66 as data recording devices. In these hard disk devices 61 to 66, for example, video data for 36 frames are dispersed and stored in accordance with the order. That is, frames 1 to 36 of video data (shown by numerals 1 to 36 in the figure)
Six hard disk devices 61 to 61 in the order of frame numbers
66 and recorded in the hard disk devices 61 to 66. The plurality of frames 1 to 36 are arranged on the hard disk device 66 again after being arranged on the hard disk device 66, and a series of video data is repeatedly arranged one frame at a time in the order from the hard disk device 61 to 66.

In the conventional recording / reproducing apparatus, the plurality of hard disk devices 61 to 66 can read out frames of video data independently. For example, when the hard disk devices 61 to 66 read the video data of frames 1 to 6, respectively, the reading periods of the frames 1 to 6 are shown in periods T1 to T6 in FIG. That is, as shown in FIG. 14, in the conventional recording / reproducing apparatus, video data for six frames can be read almost in parallel, with a time lag for transferring the reproduced frames. Therefore, a plurality of hard disk drives 6
In the conventional recording / reproducing apparatus using 1 to 66, compared with the apparatus using a single hard disk drive 51 (FIG. 10),
The read time for the same number of frames can be significantly reduced.

Next, an operation of sequentially reproducing video data on three output channels A, B, and C will be described with reference to FIG. In the following description, it is assumed that video data is reproduced at a normal reproduction speed. FIG.
FIG. 4 is an explanatory diagram showing an operation in a case where video data is sequentially reproduced on a plurality of output channels in the recording / reproducing apparatus shown in FIG. The numbers shown in FIG.
66 to 66 (FIG. 13) indicate the frame numbers of the video data recorded, and A, B, and C indicate the output channels to which the reproduced frames are output. When the conventional recording and reproducing apparatus sequentially reproduces video data on output channels A, B, and C, as shown in FIG.
Are read out and sent to the output channel A. Next, the conventional recording / reproducing devices are hard disk devices 61 to 61.
The frames 13 to 18 are read out in parallel from 66 and sent to the output channel B. Subsequently, the conventional recording / reproducing device reads the frames 25 to 30 in parallel from the hard disk devices 61 to 66, and sends them to the output channel C. After that, the conventional recording / reproducing apparatus starts transmitting the frames 7 to 12 in parallel from the hard disk devices 61 to 66.
Are read out and sent to the output channel A again.
As described above, in the conventional recording / reproducing apparatus, by reading one frame from each of the hard disk devices 61 to 66 in parallel, the load is prevented from being concentrated on a specific hard disk device. Further, the frames are sequentially transmitted to the output channels A, B, and C by circulating through the output channels of the output destination, so that a plurality of output channels A, B, and C are output.
Streams can be delivered almost simultaneously every time.

[0007]

In the conventional recording / reproducing apparatus shown in FIG. 13, the readout method of each output channel is controlled so that the load is not concentrated on a specific hard disk drive when reproducing at a normal reproducing speed. It had been. For this reason, when high-speed display reproduction (special reproduction) such as fast-forward reproduction and rewind reproduction is performed on one output channel, concentration of load on a specific hard disk device may occur when only a fixed number of frames are skipped. there were. In particular,
In the arrangement of digital data in the hard disk device shown in FIG. 13, at least 2 ×, 3 ×, 4 ×, and 6 ×
When performing double-speed high-speed display reproduction, the load concentrated on a specific hard disk device. In particular, when the 6 × speed high-speed display reproduction is performed, all the continuous frames for the 6 × speed, for example, frames 1, 7, 13, 19, 25, and 31 are read from one hard disk device 61. The load concentrated on the hard disk device 61. Further, in this conventional recording / reproducing apparatus, for example, the time from completion of reading of frame 1 to completion of reading of frame 7 (shown by “reproduction period corresponding to 6 frames” in FIG. Shorter than the continuous playback time at normal playback speed. Further, since all the hard disk devices 61 to 66 reproduce video data to the other output channels B and C, there is a time margin between the completion of reading of the frame 1 and the start of reading of the frame 7. Almost no. For this reason, in this conventional recording / reproducing apparatus, it was not possible to read out frames from the same hard disk device for the same output channel during the period of reading out six consecutive frames. Further, the reproduction of video data to another output channel cannot be interrupted for one output channel. Specifically, in the conventional recording / reproducing apparatus, after reading frame 1 from the hard disk device 61 in response to the distribution request for the output channel A, the recording / reproducing device ignores the distribution request for the output channels B and C, and Frame 7 could not be read continuously. As a result, this conventional recording / reproducing apparatus cannot respond to a request for high-speed display reproduction from one output channel when video data is sequentially reproduced on a plurality of output channels.

[0008] In response to the above problems, the following (1),
Alternatively, it is known that high-speed display reproduction can be performed even when video data is sequentially reproduced on a plurality of output channels using the method (2). (1) A video in a fast-forward state reproduced at a plurality of required reproduction speeds is encoded at a normal reproduction speed, so that special video data corresponding to each reproduction speed is prepared and stored in advance. Then, when high-speed display reproduction is requested, the special video data is read out according to the requested reproduction speed and output to the output channel of the request destination. (2) A read band for high-speed display reproduction is reserved in a specific hard disk device in advance, and video data for high-speed display reproduction is read using the reserved band and output to the output channel of the request destination.

However, in the case of using the above method (1), special video data corresponding to each required reproduction speed must be prepared in advance, so that special video data must be prepared and stored. There was a problem that time and labor were required. Further, it is necessary to provide an area for recording such special video data, and the recording efficiency of the recording / reproducing apparatus, that is, the number of titles that can be output to an output channel is reduced. In addition, in the case of using the method (2), since a band for high-speed display reproduction is secured in a specific hard disk device, video data can be transmitted at the same time as compared with a recording and reproduction device using the entire band. There is a problem that the number of channels is reduced. Further, when the band for high-speed display reproduction is small, the number of channels capable of high-speed display reproduction is reduced, and there is a problem that it is not possible to cope with all the required output channels.

The present invention has been made to solve the above-mentioned problems, and the load is concentrated on a specific data recording device even when performing high-speed display reproduction such as fast-forward reproduction and rewind reproduction. It is an object of the present invention to provide a recording / reproducing apparatus capable of exhibiting the maximum processing capability without using it, and a recording / reproducing method thereof.

[0011]

According to the present invention, there is provided a recording / reproducing apparatus comprising: first to L-th (L is an integer of 2 or more) data recording means for holding a series of digital data in a distributed manner; If the state stored in each of the first to L-th data recording means is one cycle, it is recorded in the first to L-th data recording means during reproduction at N times speed (N is an integer of 2 or more). Among the L × N digital data of N cycles, the average value of the intervals of the digital data after rearranging the digital data in the order of the digital data coincides with the thinning interval of the digital data at the time of reproduction at N times speed. Reading means for reading L digital data such that the number of readings of digital data from all data recording means is one at a time or equal to the number of readings at the time of normal speed reproduction; And it is equipped with a sorting means for rearranging the order of the digital data of the L number of digital data from the means. With this configuration, digital data for N-times high-speed display reproduction can be converted into normal data within the same reproduction time as in the case of reproduction at a normal reproduction speed without concentrating a load on a specific data recording unit. Reproduction can be performed from the same interval, the same frequency, and the same data recording means as the reproduction speed.

Another recording / reproducing apparatus according to the present invention comprises a first to an L-th (L is an integer of 2 or more) data recording means for holding a series of digital data in a distributed manner. Assuming that the state accumulated in each of the L-th data recording means is one cycle, the P-th (P is an integer of 2 or more and L or less) L data recording means is the Q-th (Q is an integer of 1 or more) digital data. Is recorded so that the (Q + L) -th digital data is written to one data recording means different from the P-th data recording means in the next successive cycle.
Writing means for writing L digital data in parallel to the first to Lth data recording means, respectively, and at the time of reproduction at N times speed (N is an integer of 2 or more), the first to Lth data recording means are used.
Of the L × N digital data for N cycles recorded in the data recording means, the average value of the interval of the digital data after rearrangement in the order of the digital data is the digital value at the time of reproduction at N times speed. Reading means for reading L digital data so as to match the data thinning interval and to make the number of times of reading digital data for all data recording means one time or equal to the number of times of reading during normal speed reproduction , And rearrangement means for rearranging the L digital data from the reading means in the order of the digital data. With this configuration, the load is not concentrated on a specific data recording unit,
It is possible to easily perform thinning-out of digital data at an interval equal to N times the high-speed display reproduction at N times speed, and to prevent a decrease in quality of the reproduced digital data at the time of N times high-speed display reproduction.

In another recording / reproducing apparatus according to the present invention, the digital data is video data of a fixed length. With this configuration, the video data for N-times high-speed display reproduction can be converted into the normal reproduction time without concentrating the load on the specific data recording means within the same reproduction time as when the reproduction is performed at the normal reproduction speed. Reproduction can be performed from the same interval, the same frequency, and the same hard disk device as the reproduction speed.

In another recording / reproducing apparatus according to the present invention, the digital data is digital data constituting a frame of video data. With this configuration, the frame of the video data for N-times high-speed display reproduction can be reproduced within the same reproduction time as in the case of the reproduction at the normal reproduction speed without the load being concentrated on the specific data recording means. Playback can be performed from the same interval, the same frequency, and the same hard disk drive as the normal playback speed.

According to the recording / reproducing method of the present invention, when one digital data is stored in each of the first to L-th (L is an integer of 2 or more) data recording means as one cycle, N times speed ( (N is an integer of 2 or more) at the time of reproduction.
Of the L × N digital data for N cycles recorded in the data recording means, the average value of the interval of the digital data after rearrangement in the order of the digital data is the digital value at the time of reproduction at N times speed. Reading L digital data so as to match the data thinning interval and to make the number of times of reading digital data for all data recording means one by one or equal to the number of times of reading during normal speed reproduction; And a step of rearranging the L digital data read in the reading step in the order of the digital data. With this configuration, digital data for N-times high-speed display reproduction can be converted into normal data within the same reproduction time as in the case of reproduction at a normal reproduction speed without concentrating a load on a specific data recording unit. Reproduction can be performed from the same interval, the same frequency, and the same hard disk device as the reproduction speed.

According to another recording / reproducing method of the present invention, when one digital data is stored in each of first to L-th (L is an integer of 2 or more) data recording means as one cycle, P (P is an integer from 2 to L) data recording means
When recording the digital data of the (th, Q is an integer of 1 or more), the (Q + L) -th digital data is written to one data recording means different from the P-th data recording means in the next successive cycle. And writing the L digital data in parallel to the first to Lth data recording means, respectively, and at the time of reproduction at N times speed (N is an integer of 2 or more), the first to Lth data recording means Of the L × N digital data for N cycles recorded in the digital data, the average value of the intervals of the digital data after rearranging in the order of the digital data is the thinning interval of the digital data at the time of reproduction at N times speed. And the number of times of reading digital data from all data recording means is one at a time or equal to the number of times of reading at the time of normal speed reproduction.
A step of reading the L digital data; and a step of rearranging the L digital data read in the reading step in the order of the digital data. With this configuration, it is possible to easily perform high-speed display reproduction at N times speed and thin out digital data at a true equal interval without concentrating a load on a specific data recording unit. Quality of the reproduced digital data can be prevented.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment showing a recording / reproducing apparatus and a recording / reproducing method of the present invention will be described below with reference to the drawings.

<< First Embodiment >> FIG. 1 is a block diagram showing the configuration of a recording / reproducing apparatus according to a first embodiment of the present invention. FIG. 2 is an explanatory diagram showing an example of an arrangement of digital data in the recording / reproducing apparatus shown in FIG. In the following description,
For the sake of simplicity, a description will be given of a recording / reproducing apparatus capable of forming a data recording apparatus with six hard disk devices and sequentially reproducing video data on three output channels. As shown in FIG. 1, the recording / reproducing apparatus includes first to sixth hard disk devices 11 to 16 capable of inputting and outputting video data in parallel, and video data constituting a title of a movie or the like from a video source (not shown). A writing unit W2 for inputting and writing video data to the first to sixth hard disk devices 11 to 16 based on an instruction from the writing frame group designation unit W1 is provided. The first to sixth hard disk devices 11 to 16 are data recording means for recording digital data, and dispersely arrange a plurality of continuous frames of video data by a striping arrangement method. Specifically, as shown in FIG. 2, for example, the video data for 36 frames is stored in the first frame number in the order of the frame number in accordance with the instruction from the writing frame group specifying unit W1.
To the sixth hard disk devices 11 to 16 and stored. The plurality of frames are arranged on the sixth hard disk device 16 and then arranged again on the first hard disk device 11, and the frames 1 to 36 are repeated in the order of going to the first to sixth hard disk devices 11 to 16. Be placed. Each of frames 1 to 36 has the minimum reproduction (processing) of video data reproduced at a normal reproduction speed.
It is a unit, for example, video data having a data length of 120 KB. The writing frame group specifying unit W1 specifies a frame group including six frames, and the writing unit W2
Writes the specified six frames in parallel to the first to sixth hard disk devices 11 to 16, respectively. These write frame group designation section W1 and write section W
2 constitutes a writing means.

Returning to FIG. 1, the recording / reproducing apparatus has a reading means for reading out frames of video data for each of the three output channels A, B, and C, and an arrangement for rearranging the frames from the reading means so as to be reproducible. Replacement means is provided. Since these reading means and rearranging means are configured identically for each of the output channels A, B, and C, only the reading means for transmitting a frame to the output channel A and the rearranging means will be described. In response to a request from the output channel A, the read frame group designating unit A1 sets the first to sixth hard disk devices 11 so that read processing does not concentrate on a specific hard disk device.
A frame group to be read from 16 to 読 み 出 し 16 is designated to the reading unit A2. The readout unit A2 includes a readout frame group designation unit A
1, each of the hard disk devices 11 to 16
From one frame in parallel and read 6
Rearranging unit A with one frame as a frame group
Output to 3. These readout frame group designating sections A
1 and the reading section A2 constitute reading means. The frame rearranging unit A3 constitutes a rearranging unit, and rearranges the six frames from the reading unit A2 in the order of the frame numbers, and sequentially outputs the frames to the output channel A.

When high-speed display reproduction at N times speed (N is an integer of 2 or more) is requested, the readout frame group designating section A1
When one cycle is defined as a state in which one frame is stored in each of L (L is an integer of 2 or more) hard disk devices,
Among L × N frames of N cycles recorded in the L hard disk drives, the average value of the interval between frames after rearrangement in the order of the frames is the number of frames at the time of reproduction at N times speed. L frames are designated so as to coincide with the thinning interval and to read out the frames from all the hard disk devices one by one. In other words, the read-out frame group designation unit A1 is configured to output the read frame group designation unit A1 in all of the first to sixth hard disk devices 11 to 16 among the 6 × N frames recorded in the first to sixth hard disk devices 11 to 16 Six frames are read one at a time and meet the following conditions (1) and (2). (1) When the specified six frames are rearranged, a frame sequence is obtained in which frames are thinned out at substantially equal intervals. (2) The average of the intervals of the decimated frames is equal to the number of decimated frames during reproduction at N times speed. Readout unit A2
Reads out six frames specified by the read-out frame group specifying unit A1, excluding 5 × N frames in a series of 6 × N frames. With this configuration, a frame for N-times high-speed display reproduction can be reproduced in the normal reproduction time within the same reproduction time as in the case of reproduction at the normal reproduction speed without reading processing being concentrated on a specific hard disk device. The same interval as the speed, the same frequency, and the same hard disk device can be read. The above-described frame group designation by the read frame group designation unit A1 is performed by a table prepared in advance or by calculation. In addition, when a large recording capacity is required for a data recording device group including a plurality of hard disk devices or the like, the number of hard disk devices is larger than the number of hard disk devices required to enable simultaneous transmission from a plurality of output channels. It is necessary to configure a data recording device group using the device. In a recording / reproducing apparatus provided with such a data recording apparatus group, the read frame group designation unit A1 sets the number of times of reading of the frame to 1 for all hard disk drives.
A frame to be read out to the data recording device group is designated so as to perform N-times high-speed display reproduction so that the number of readings is not the same as the number of times but the number of readings at the time of normal speed reproduction. For example, in a recording / reproducing apparatus in which a data recording device group is configured using six hard disk devices, when the data recording device group is changed to 12 hard disk devices in order to double the recording capacity, Writing and reading are performed in units of six frames instead of twelve frames. Therefore, even in the case of performing N-times high-speed display reproduction, the read frame group specifying unit A1 specifies six frames so that the number of read frames is the same as the number of read times during normal speed reproduction.

Next, the reading operation of the recording / reproducing apparatus of the present embodiment will be specifically described. When reproducing at a normal reproduction speed, the read-out frame group designation unit A1 (FIG. 1)
Are the first readout frame group, frame 1,
2, 3, 4, 5, and 6 are designated. As is apparent from FIG. 2, in this frame group designation, read processing does not concentrate on a specific hard disk device. The reading unit A2 (FIG. 1) reads the designated frames 1 to 6 from the first to sixth hard disk devices 11 to 16 (FIG. 1), respectively. Since the frames 1 to 6 are read from the reading unit A2 in the order of the frame numbers, the frame rearranging unit A3
(FIG. 1) sequentially outputs the read frames 1 to 6 to the output channel A without rearranging the frames 1 to 6. Subsequently, the read frame group designation unit A1 sets the frames 7, 8, 9, 10,.
11 and 12 are specified. Hereinafter, the same read operation as described above is repeatedly performed.

In the case of performing double speed high-speed display reproduction, the read frame group designating section A1 designates frames 1, 8, 3, 10, 5, and 12 as the first read frame group. As is apparent from FIG. 2, even when the frame group is specified, the read processing does not concentrate on a specific hard disk device. The reading unit A2 outputs the designated frames 1, 8,
3, 10, 5, and 12 are read from the first to sixth hard disk devices 11 to 16, respectively. The frame rearranging unit A3 rearranges frames 1, 8, 3, 10, 5, and 12 in the order of frame numbers, and outputs frames 1, 3, 5, 8, 1,
Output to the output channel A in the order of 0 and 12. Subsequently, the read frame group designating unit A1 sets the frames 13, 20, 15, 22, 1 as the next read frame group.
Specify 7 and 24. Hereinafter, the same read operation as described above is repeatedly performed. In the case of performing 3 × high-speed display reproduction, the read frame group designation unit A1 sets the frames 1, 14, 9, 4, 17, and 17 as the first read frame group.
Specify 12. As is apparent from FIG. 2, even when the frame group is specified, the read processing does not concentrate on a specific hard disk device. The reading unit A2 reads the designated frames 1, 14, 9, 4, 17, and 12 from the first to sixth hard disk devices 11 to 16, respectively. The frame rearranging unit A3 outputs frames 1, 14, 9, 4, 1
7 and 12 are rearranged in the order of the frame numbers, and are sequentially output to the output channel A in the order of the frames 1, 4, 9, 12, 14, and 17. Subsequently, the readout frame group designation unit A
1 represents a frame 19,
32, 27, 22, 35 and 30 are designated. Hereinafter, the same read operation as described above is repeatedly performed.

In the case of performing quadruple-speed high-speed display reproduction, the readout frame group designation unit A1 designates frames 1, 14 , 9, 22 , 5, and 18 as the first readout frame group. As is apparent from FIG. 2, even when the frame group is specified, the read processing does not concentrate on a specific hard disk device. The reading unit A2 reads the designated frames 1, 1
4, 9, 22 , 5, and 18 are read from the first to sixth hard disk devices 11 to 16, respectively. The frame rearranging unit A3 rearranges the frames 1, 14 , 9, 22 , 5, and 18 in the order of the frame numbers, and
The signals are sequentially output to the output channel A in the order of 14, 18, and 22 . Hereinafter, the same read operation as described above is repeatedly performed. In the case of performing 6 × speed high-speed display reproduction, the read frame group designation unit A1 sets the first read frame group as:
Frames 1, 32, 15, 22, 29 and 6 are designated.
As is clear from FIG. 2, even when this frame group is specified,
Read processing is not concentrated on a specific hard disk device. The reading unit A2 outputs the designated frames 1, 32,
15, 22, 29, and 6 are read from the first to sixth hard disk devices 11 to 16, respectively. The frame rearranging unit A3 rearranges the frames 1, 32, 15, 22, 29, and 6 in the order of the frame numbers, and
5, 22, 29, and 32 are sequentially output to the output channel A. Hereinafter, the same read operation as described above is repeatedly performed.

Next, in the recording / reproducing apparatus of this embodiment,
FIG. 3 shows the relationship between the output order of reproduced frames and their numbers when performing high-speed display reproduction at 2 × speed and 3 × speed. In FIG. 3, a straight line 20 (shown by a broken line)
Is a straight line indicating the relationship between the output order of frames to be reproduced and the number of the frames to be reproduced in the case of performing the double speed high speed display reproduction, and the straight line 30 is the reproduction in the case of performing the triple speed high speed display reproduction. This is a straight line indicating the relationship between the output order of frames to be output and their numbers. When performing 2x high-speed display playback,
In the recording / reproducing apparatus of this embodiment, as shown by a curve 21 in FIG. This shift is to prevent the load from being concentrated on a specific hard disk device, and is caused, for example, by reading the frame 10 instead of the frame 9 to be reproduced as the fifth frame. Similarly, when high-speed display / playback at 3 × speed is performed, in the recording / playback apparatus of the present embodiment, as shown by a curve 31 in FIG. This shift is also to prevent the load from being concentrated on a specific hard disk device. For example, the shift is caused by reading out the frame 17 instead of the frame 16 to be originally reproduced as the sixth frame. As described above, in the recording / reproducing apparatus of the present embodiment, when performing high-speed display / reproduction at N times speed, in order to prevent a load from being concentrated on a specific hard disk device,
A slight difference occurs between the read frame and the frame to be originally reproduced. In particular, when performing relatively high-speed display reproduction at a double speed or a triple speed, there is a problem that the quality of the image is significantly reduced due to the skipped frames as compared with a high-speed display such as a six-times speed. Specifically, for example, in an image of a car running at a constant speed, the speed is 2 ×, 3 ×
When performing high-speed display reproduction at a relatively low speed of double speed, an unnatural image in which the car runs a little faster or slower than a certain speed is displayed more conspicuously than a high-speed one such as six times speed.

<< Second Embodiment >> FIG. 4 is a block diagram showing the configuration of a recording / reproducing apparatus according to a second embodiment of the present invention. FIG. 5 is an explanatory diagram showing an example of an arrangement of digital data in the recording / reproducing apparatus shown in FIG. In this embodiment, in the configuration of the recording / reproducing apparatus, the P-th (P is an integer of 2 or more and L or less) L data recording means (L is an integer of 2 or more) is used.
When the data recording means records the Qth digital data (Q is an integer of 1 or more), the writing means records the (Q + L) th digital data in one data recording different from the Pth data recording means. It was configured to write to the means. The other parts are the same as those of the first embodiment, and the duplicated description thereof will be omitted. In FIG. 4, when a state in which one frame is arranged in each of the first to sixth hard disk devices 11 to 16 is defined as one cycle, the write frame group designation unit W1 ′ determines that six consecutive frames are one frame earlier than the previous frame. Is instructed to write to each of the different hard disk devices different from the hard disk device in which is disposed. In particular,
As shown in FIG. 5, when frames 1 to 6 are recorded on the first to sixth hard disk devices 11 to 16, respectively, the write frame group designation unit W1 ′ outputs the six frames 7 to 7 to be written next. 12 is sequentially written to the first to sixth hard disk devices 11 to 16 one frame at a time in an order different from the order of the frame numbers. As a result, for example, frames 12, 7, 8, 9, 1
0 and 11 are written to the first to sixth hard disk devices 11 to 16 by the writing unit W2. With such a configuration, in the recording / reproducing apparatus of the present embodiment, in the reading operation, the load on the specific data recording means is not concentrated, and the digital data of the interval exactly equal to the N-times high-speed display / reproducing operation can be obtained. Thinning can be easily performed. For this reason, it is possible to prevent the quality of the reproduced digital data from deteriorating at the time of N-times high-speed display reproduction.

Next, the reading operation of the recording / reproducing apparatus according to the present embodiment will be specifically described. In the case of reproducing at a normal reproduction speed, the read frame group specifying unit A1 (FIG. 4) specifies frames 1, 2, 3, 4, 5, and 6 as the first read frame group. As is apparent from FIG. 5, in this frame group designation, read processing does not concentrate on a specific hard disk device. Readout unit A2
(FIG. 4) reads out the designated frames 1 to 6 from the first to sixth hard disk devices 11 to 16 (FIG. 4), respectively. Since the frames 1 to 6 are read from the reading unit A2 in the order of the frame numbers, the frame rearranging unit A3 (FIG. 4) does not rearrange the frames 1 to 6,
The read frames 1 to 6 are sequentially output to the output channel A. Subsequently, the read frame group specifying unit A1 sets the frames 12, 7, 8,.
9, 10, and 11 are specified. The reading unit A2 reads the designated frames 12, 7, 8, 9, 10, and 11 from the first to sixth hard disk devices 11 to 16, respectively. The frame rearranging unit A3 includes frames 12, 7,
8, 9, 10, 11 are rearranged in the order of frame numbers,
The frames are sequentially output to the output channel A in the order of frames 7, 8, 9, 10, 11, and 12. Hereinafter, the same read operation as described above is repeatedly performed.

In the case of performing double speed high-speed display reproduction, the readout frame group designation section A1 designates frames 1, 7, 3, 9, 5, and 11 as the first readout frame group. As is apparent from FIG. 5, even when the frame group is specified, the read processing does not concentrate on a specific hard disk device. The reading unit A2 outputs the designated frames 1, 7,
3, 9, 5, and 11 are first to sixth hard disk drives 1
1 to 16, respectively. Frame sorting unit A
No. 3 rearranges frames 1, 7, 3, 9, 5, 11 in the order of frame numbers, and outputs frames 1, 3, 5, 7, 9, 9, 1
The signals are sequentially output to the output channel A in the order of 1. Subsequently, the read frame group specifying unit A1 sets the frames 17, 23, 13, 19, 15, 2, and 3 as the next read frame group.
Specify 1. Hereinafter, the same read operation as described above is repeatedly performed. In the case of performing the triple-speed high-speed display reproduction, the read frame group specifying unit A1 specifies frames 1, 7, 13, 4, 10, and 16 as the first read frame group. As is apparent from FIG. 5, even when the frame group is specified, the read processing does not concentrate on a specific hard disk device. The reading unit A2 reads the designated frame 1,
7, 13, 4, 10, and 16 are read from the first to sixth hard disk devices 11 to 16, respectively. The frame rearranging unit A3 outputs frames 1, 7, 13, 4, 10, 16
Are arranged in the order of frame numbers, and frames 1, 4,
7, 10, 13, and 16 are sequentially output to the output channel A. Subsequently, the read frame group specifying unit A1 sets the frames 22, 28, and 3 as the next read frame group.
4, 19, 25 and 31 are designated. Hereinafter, the same read operation as described above is repeatedly performed.

In the case of performing the quadruple-speed high-speed display reproduction, the read frame group designating unit A1 designates frames 1, 18, 13, 9, 5, and 21 as the first read frame group. As is apparent from FIG. 5, even when the frame group is specified, the read processing does not concentrate on a specific hard disk device. The reading unit A2 reads the designated frames 1, 1
8, 13, 9, 5, and 21 are read from the first to sixth hard disk devices 11 to 16, respectively. The frame rearranging unit A3 rearranges the frames 1, 18, 13, 9, 5, and 21 in the order of the frame numbers, and
The signals are sequentially output to the output channel A in the order of 13, 18, and 21. Hereinafter, the same read operation as described above is repeatedly performed. In the case of performing 6 × speed high-speed display reproduction, the read frame group designation unit A1 sets the first read frame group as:
Frames 1, 7, 13, 19, 25 and 31 are designated.
As is clear from FIG. 5, even if this frame group is specified,
Read processing is not concentrated on a specific hard disk device. The reading unit A2 outputs the designated frames 1, 7, 1
3, 19, 25 and 31 are read from the first to sixth hard disk devices 11 to 16, respectively. Since the frames 1, 7, 13, 19, 25, and 31 are read from the reading unit A2 in the order of the frame numbers, the frame rearranging unit A3 does not rearrange the frames 1, 7, 13, 19, 25, and 31. , And sequentially output to the output channel A. Hereinafter, the same read operation as described above is repeatedly performed.

As described above, in the recording / reproducing apparatus of this embodiment, when high-speed display / reproduction at N times speed is performed, a frame to be reproduced always coincides with a frame to be reproduced without concentration of load on a specific hard disk device. , A frame can be designated and read. For this reason, it is possible to solve the problem in the relatively slow high-speed display reproduction of the double speed and the triple speed shown in the first embodiment, and it is possible to prevent the quality of the reproduced video from lowering.

In the first and second embodiments, the case where video data is arranged in each hard disk device in units of one frame has been described. However, one frame is divided into a plurality of hard disk devices, The same effect can be obtained when the hard disk device described above is treated as one recording unit for recording one frame.

<< Third Embodiment >> FIG. 6 is a block diagram showing a configuration of a recording / reproducing apparatus according to a third embodiment of the present invention. In this embodiment, in the configuration of the recording / reproducing apparatus, a series of video data constituting a video stream (data sequence), and a plurality of video data having an irregular data length are recorded / reproduced. The other parts are the same as those of the first embodiment, and the duplicated description thereof will be omitted. In FIG. 6, the write data group designation unit W41
Instructs the writing unit W2 to write a plurality of video data having inconsistent data lengths in the first to sixth hard disk devices 11 to 16 in a distributed manner. This allows
For example, 36 pieces of video data are distributed and stored in the first to sixth hard disk devices 11 to 16 in accordance with the arrangement of the digital data shown in FIG. Each of the read data group designation sections A41, B41, and C41 performs read processing on a specific hard disk device, similarly to the read frame group designation sections A1, B1, and C1 (FIGS. 1 and 4) of the first and second embodiments. A data group read from the first to sixth hard disk devices 11 to 16 is read out by the reading unit A2 so as not to concentrate.
Specify to B2 and C2. Data sorting units A43, B4
3, C43 rearranges the video data read from the reading units A2, B2, C2 in the order of the video stream, and outputs them to output channels A, B, C, respectively.

As a specific example of the video data, MPE
This is video data of a compression method that is not frame-independent according to the G (Moving Picture Experts Group) standard or the like, or video data whose frame is not fixed length. When such video data is read out and N-times high-speed display reproduction is performed, the amount of video data that can be decoded as a frame is reduced, and an N-times video that changes smoothly as in the first embodiment cannot be expected. Specifically, for example, when high-speed display reproduction at 2 × speed is performed, a part of the read video data cannot be decoded as a frame, as indicated by the hatched portion in FIG.
Therefore, the part of the video that cannot be decoded as a frame is
For example, the immediately preceding image is continuously displayed, and the smoothness (quality) of the transition of the image is reduced. However, in the recording / reproducing apparatus of this embodiment, similarly to the first and second embodiments, the same disk I / O as in the case of reproducing at a normal reproducing speed without concentrating a load on a specific hard disk device.
It is possible to perform N-times high-speed display reproduction with (input / output) load. In addition, even when performing N-times high-speed display reproduction, decoding is always possible, and information for performing seamless video reproduction (for example, information indicating the order to be reproduced in N-times high-speed display reproduction) is encoded into video data. For example, the transition of the video at N times speed can be made smooth by including it at the time.

<< Fourth Embodiment >> FIG. 8 is a block diagram showing a configuration of a recording / reproducing apparatus according to a fourth embodiment of the present invention. In this embodiment, in the configuration of the recording / reproducing apparatus, L
Of the data recording means (L is an integer of 2 or more)
When the (P is an integer of 2 or more and L or less) data recording means is recording the Qth (Q is an integer of 1 or more) digital data, the writing means writes the (Q + L) th digital data in the Pth It is configured to write data to one data recording means different from the data recording means. The other parts are the same as those of the third embodiment, and the duplicated description thereof will be omitted. In FIG. 8, the write data group designating section W41 ′ performs a write frame when a state in which one piece of video data having an inconsistent data length is arranged in each of the first to sixth hard disk devices 11 to 16 is one cycle. The group designation unit W41 ′ instructs the writing unit W2 to write the six consecutive video data to another hard disk device different from the hard disk device in which the video data of one cycle before is arranged. This allows 36
Pieces of video data correspond to the arrangement of digital data shown in FIG.
16 is stored.

As a specific example of the video data, as in the third embodiment, an MPEG (Moving Picture Expe
rts Group) video data of a compression method that is not frame-independent according to the standard, or video data whose frame is not fixed length. When such video data is read and N-times high-speed display reproduction is performed, the amount of video data that can be decoded as a frame is reduced, and an N-times video that changes smoothly as in the second embodiment cannot be expected. Specifically, for example, 2
When double-speed high-speed display reproduction is performed, a part of the read video data cannot be decoded as a frame, as indicated by the hatched portion in FIG. For this reason, as for the video of the part that cannot be decoded as a frame, for example, the immediately preceding video is continuously displayed, and the smoothness (quality) of the transition of the video deteriorates. However, in the recording / reproducing apparatus of this embodiment, similarly to the first and second embodiments, the same disk I / O as in the case of reproducing at a normal reproducing speed without concentrating a load on a specific hard disk device. N at (input / output) load
Double-speed high-speed display reproduction can be performed. In addition, even when performing N-times high-speed display reproduction, decoding is always possible, and information for performing seamless video reproduction (for example, information indicating the order to be reproduced in N-times high-speed display reproduction) is encoded into video data. For example, the transition of the video at N times speed can be made smooth by including it at the time.

In the third and fourth embodiments, a video stream composed of independent data having a fixed frame size and having a fixed length is written to each hard disk device in units of two or more frames. Applicable to configurations.

[0036]

According to the recording / reproducing apparatus and the recording / reproducing method of the present invention, when high-speed display / reproduction at N times speed (N is an integer of 2 or more) is required, one digital data is stored in L units (L).
Is an integer greater than or equal to 2), and one cycle is defined as the state stored in each data recording means. Of the L × N digital data of N cycles recorded in the L data recording means, the digital data The average value of the intervals of the digital data after rearrangement in order matches the thinning interval of the digital data at the time of reproduction at N times speed, and the number of times of reading of the digital data from all data recording means is once. Thus, the reading means specifies and reads out the L digital data. With this configuration, fast-forward playback,
Even in the case of performing high-speed display reproduction such as rewind reproduction, the load is not concentrated on a specific data recording means, and a digital signal for high-speed display reproduction of N times speed within the same reproduction time as in the case of reproduction at normal reproduction speed. The data can be reproduced from the same interval, the same frequency, and the same data recording means as the normal reproduction speed. In another recording / reproducing apparatus and a recording / reproducing method according to the present invention, a P-th (P is an integer of 2 or more and L or less) data recording means of L (L is an integer of 2 or more) data recording means. Is recording the Q-th (Q is an integer of 1 or more) digital data,
L) writing the digital data into one data recording means different from the Pth data recording means; With this configuration, it is possible to easily perform high-speed display reproduction at N times speed and thin out digital data at a true equal interval without concentrating a load on a specific data recording unit. Quality of the reproduced digital data can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of an arrangement of digital data in the recording / reproducing apparatus shown in FIG. 1;

FIG. 3 is a graph showing the relationship between the output order of reproduced frames and their numbers when double-speed and triple-speed high-speed display reproduction is performed in the recording / reproducing apparatus shown in FIG. 1;

FIG. 4 is a block diagram showing a configuration of a recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an example of an arrangement of digital data in the recording / reproducing device shown in FIG. 4;

FIG. 6 is a block diagram showing a configuration of a recording / reproducing apparatus according to a third embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a range of video data that can be decoded as a frame when performing high-speed display reproduction at 2 × speed in the recording / reproducing apparatus shown in FIG. 6;

FIG. 8 is a block diagram showing a configuration of a recording / reproducing apparatus according to a fourth embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a range of video data that can be decoded as a frame when performing high-speed display reproduction at 2 × speed in the recording / reproducing apparatus shown in FIG. 8;

FIG. 10 is an explanatory diagram showing an example of digital data arrangement in a conventional recording / reproducing device using a single hard disk device as a data recording device.

11 is an explanatory diagram showing a configuration of a reading period in the hard disk device shown in FIG.

FIG. 12 is an explanatory diagram showing an operation in a case where digital data is continuously read in the hard disk device shown in FIG. 10;

FIG. 13 is an explanatory diagram showing an example of the arrangement of digital data in a conventional recording / reproducing device using a plurality of hard disk devices as a data recording device.

FIG. 14 is an explanatory diagram showing an operation in the case of reading a plurality of digital data from the plurality of hard disk devices shown in FIG. 13 in parallel.

FIG. 15 is an explanatory diagram showing an operation in a case where video data is sequentially reproduced on a plurality of output channels in the recording and reproducing apparatus shown in FIG. 13;

[Explanation of symbols]

 11-16 Hard disk drive W1, W1 'Write frame group designator W41, W41' Write data group designator W2 Writer A1, B1, C1 Read frame group designator A2, B2, C2 Reader A41, B41, C41 Read data Group designation section A3, B3, C3 Frame rearrangement section A43, B43, C43 Data rearrangement section

Claims (6)

(57) [Claims] 1. A first to L-th (L is an integer of 2 or more) data recording means for holding a series of digital data in a distributed manner, wherein one digital data is the first to L-th data recording means. Assuming that the state accumulated in the memory is one cycle, N times speed (N
Is an integer equal to or greater than 2) during reproduction of the digital data after rearranging in order of digital data among L × N digital data for N cycles recorded in the first to Lth data recording means. The average value of the data intervals matches the thinning-out interval of digital data at the time of reproduction at N times speed, and the number of times of reading digital data for all data recording means is one by one or at the time of normal speed reproduction. A recording / reproducing apparatus comprising: reading means for reading L digital data so as to be equal to the number of times; and rearranging means for rearranging the L digital data from the reading means in the order of the digital data. . 2. A first to L-th (L is an integer of 2 or more) data recording means for holding a series of digital data in a distributed manner, wherein one digital data is the first to L-th data recording means. Assuming that the state accumulated in the data storage unit is one cycle, the Pth (P is an integer of 2 or more and L or less) data recording means is the Qth (Q
Is an integer greater than or equal to 1), and in the next successive period, the (Q + L) -th digital data is written to one data recording unit different from the P-th data recording unit. Writing means for writing a plurality of pieces of digital data in parallel to the first to Lth data recording means, respectively, and when reproducing at N-times speed (N is an integer of 2 or more), recording in the first to Lth data recording means. L × N for N cycles
Among the pieces of digital data, the average value of the intervals of the digital data after rearranging in the order of the digital data matches the thinning interval of the digital data at the time of reproduction at N times speed,
Reading means for reading L digital data such that the number of times of reading digital data from all data recording means is one at a time or equal to the number of times of reading during normal speed reproduction; A recording / reproducing apparatus comprising a rearranging means for rearranging digital data in the order of digital data. 3. The recording / reproducing apparatus according to claim 1, wherein the digital data is video data of a fixed length. 4. The recording / reproducing apparatus according to claim 1, wherein the digital data is digital data constituting a frame of video data. 5. The method according to claim 1, wherein one digital data is composed of first to L-th data.
(L is an integer of 2 or more) stored in each data recording means as one cycle, and at the time of reproduction at N times speed (N is an integer of 2 or more), the first to L-th data recording means L × N for N cycles recorded
Among the pieces of digital data, the average value of the intervals of the digital data after rearranging in the order of the digital data matches the thinning interval of the digital data at the time of reproduction at N times speed,
And reading out L digital data so that the number of readings of digital data from all data recording means is one at a time or equal to the number of readings at the time of reproduction at normal speed. Reordering the L digital data in the order of the digital data. 6. The method according to claim 1, wherein one digital data is a first to an L-th data.
When the state stored in each data recording means (L is an integer of 2 or more) is defined as one cycle, the Pth (P is an integer of 2 or more and L or less) data recording means is the Qth (Q is 1 or more) ) Of digital data, the (Q + L) -th digital data is written to one data recording means different from the P-th data recording means in the next successive cycle. A step of writing data in parallel to the first to Lth data recording means, and at the time of reproduction at N times speed (N is an integer of 2 or more), the N cycles recorded in the first to Lth data recording means are used. L × N for minutes
Among the pieces of digital data, the average value of the intervals of the digital data after rearranging in the order of the digital data matches the thinning interval of the digital data at the time of reproduction at N times speed,
And reading out L digital data so that the number of readings of digital data from all data recording means is one at a time or equal to the number of readings at the time of reproduction at normal speed. Reordering the L digital data in the order of the digital data.