JP2001352504A - Multi-channel reproducing device, multi-channel recording and reproducing device, and multi-channel recording and reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-channel recording and reproducing device by which reproduced video images are continuous among channels even when the channels are changed and restored in the case that multi-channel video images are recorded and reproduced at the same time. SOLUTION: The multi-channel recording and reproducing device records/ reproduces multi-channel video images to/from a random access recording medium under the control of a recording control section 74 and a reproduction control section 78. The recording control section 74 records the multi-channel video images to the recording medium as a set of fields including address information and video image information as its control. The reproduction control section 78 is provided with a reproduction position information storage section 82 that stores address information of a last reproduction position by each channel and with a reproduction position selection section 80 that selects a reproduction start position based on address information stored in the reproduction position information storage section 82 as to a reproduction selection channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-channel reproducing apparatus, a multi-channel recording / reproducing apparatus for video recorded on a randomly accessible recording medium, and
The present invention relates to a multi-channel recording and reproducing method.

[0002]

2. Description of the Related Art A multi-channel recording / reproducing apparatus for recording / reproducing a multi-channel image on a randomly accessible recording medium, such as a hard disk, a magneto-optical disk, or a nonvolatile semiconductor memory, is known. . In such a recording / reproducing apparatus, a certain channel is reproduced at the same time as multi-channel recording,
There are times when it is desired to play back another channel during the playback and return to the playback of the previous channel again. In such a case, when returning to the previous channel, there is a problem that the viewer cannot enjoy a continuous video because the video on the previous channel progresses only while the other channel is being played. there were.

Also, in a reproducing apparatus for reproducing multi-channel video recorded on a randomly accessible recording medium such as a hard disk or a non-volatile semiconductor memory, a certain channel is reproduced during the reproduction of another channel, and then reproduced again. I want to go back to the previous channel. Even in such a case, if the reproduction is resumed from the position where the reproduction was performed immediately before the switching in the previous channel, the viewer can enjoy the continuous video regardless of the channel switching.

The present invention has been made in view of the above points, and has as its object to provide a multi-channel reproducing apparatus, a multi-channel recording / reproducing apparatus, which can solve at least one of the following problems. Another object of the present invention is to provide a multi-channel recording / reproducing method.

[0005] 1) In the reproduction of a multi-channel video recorded on a randomly accessible recording medium, the reproduced video is made continuous in each channel even if the video moves between channels.

2) In the reproduction performed simultaneously with the recording of a multi-channel image on a recording medium that can be accessed randomly, the reproduced image is made continuous in each channel even if the image moves between channels.

[0007]

(1) A multi-channel playback device according to the present invention is a multi-channel playback device for playing back multi-channel video from a randomly accessible recording medium under the control of a playback control unit. In the recording medium, the video is recorded as an accumulation of fields including address information and video information corresponding to a recording position on the recording medium, and the reproduction control unit controls the last reproduction position. A reproduction position information storage unit that stores address information for each channel; information on a reproduction selection channel that is a channel selected for reproduction; and the address stored in the reproduction position information storage unit for the reproduction selection channel. A reproduction position selection unit for selecting a reproduction start position based on the information.

According to the present invention, in reproducing a multi-channel video recorded on a randomly accessible recording medium, based on the address information of the last reproduction position stored for each channel in the reproduction position information storage section, The reproduction start position in the channel selected for reproduction is selected by the reproduction position selection unit. Therefore, in the reproduction of the multi-channel video, the reproduced video is continuous in each channel even if the video is switched between channels.

(2) The multi-channel reproducing apparatus according to the present invention is characterized in that the reproduction position information storage section also stores address information of a field subsequent to the last reproduction position.

According to the present invention, when recording on the recording medium at the address of the last reproduction position is not available,
Since the reproduction can be performed using the recording at the address of the subsequent field, the possibility that the reproduction is interrupted is greatly reduced.

(3) A multi-channel recording / reproducing apparatus according to the present invention is a multi-channel recording / reproducing apparatus for recording / reproducing multi-channel video on a randomly accessible recording medium under the control of a recording control section and a reproduction control section. The recording control unit controls recording of multi-channel video on the recording medium as an accumulation of fields including address information corresponding to a recording position on the recording medium and video information, and performs the reproduction. A control unit configured to store, for each channel, address information of a last reproduction position, information on a reproduction selection channel that is a channel selected for reproduction, and information on the reproduction position information for the reproduction selection channel. A playback position selection unit that selects a playback start position based on the address information stored in the storage unit. Comprising.

According to the present invention, in reproducing a multi-channel video recorded on a randomly accessible recording medium, based on the address code of the last reproduction position stored for each channel in the reproduction position information storage section, The reproduction start position in the channel selected for reproduction is selected by the reproduction position selection unit. Therefore, in the reproduction performed at the same time as the recording of the multi-channel video, the reproduced video is continuous in each channel even if the data is switched between channels. In addition, when only multi-channel video is reproduced, the reproduced video is continuous in each channel even if the image moves between channels.

(4) In the multi-channel reproducing apparatus according to the present invention, the reproduction position information storage section also stores address information of a field subsequent to the last reproduction position.

According to the present invention, when recording on the recording medium at the address of the last reproduction position is not available,
Since the reproduction can be performed using the recording at the address of the subsequent field, the possibility that the reproduction is interrupted is greatly reduced.

(5) A multi-channel recording / reproducing method according to the present invention is a multi-channel recording / reproducing method for recording / reproducing a multi-channel image on a recording medium which can be randomly accessed, and corresponds to a recording position on the recording medium. As an integration of each field including an address code and video information, a multi-channel video is recorded on the recording medium, an address code of a last reproduction position is stored for each channel, and a reproduction is selected in a channel selected for reproduction. A reproduction start position is selected based on information of a certain reproduction selection channel and the address information stored for the reproduction selection channel.

According to the present invention, in the reproduction of a multi-channel video recorded on a randomly accessible recording medium, the channel selected for reproduction based on the address code of the last reproduction position stored for each channel. Is selected. Therefore, in the reproduction performed at the same time as the recording of the multi-channel video, the reproduced video is continuous in each channel even if the data is switched between channels. Further, in the reproduction of the recorded multi-channel video, the video to be reproduced is continuous in each channel even if the video moves between channels.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below more specifically with reference to the drawings.

1. <Multi-Channel Recording / Reproducing Apparatus> FIG. 1 is a block diagram showing a multi-channel recording / reproducing apparatus 10 of the present embodiment. Multi-channel recording / reproducing device 10
Are roughly provided with a portion as a recording device and a portion as a reproducing device. As shown in FIG. 1, the recording device includes an input unit 14 for each channel, an A / D conversion unit 22 for each channel, a video signal compression unit 30 for each channel, a recording data processing unit 34, a recording medium 40,
The recording control section 74 of the system control section 70 and the recording control signal input section 12 are included. The parts as the reproducing device include the recording medium 40, the reproduction data processing unit 44, the video signal decompression unit 52, the D / A conversion unit 56, and the video signal output unit 6.
0, a playback control unit 78 of the system control unit 70, and a playback control signal input unit 42.

First, the configuration and operation of the multi-channel recording / reproducing apparatus 10 as a recording apparatus will be described. A plurality of input units 14, that is, channel 1 input units 14 to channel N
Each of the input units 14 receives an output from a tuner, a video camera, or another video playback device. In addition, each of those devices may be configured as a part of the multi-channel recording / reproducing device 10. The video signal output from each input unit 14 is the A signal of each channel.
/ D conversion unit 22.

The A / D converter 22 of each channel performs A / D conversion on the input analog video signal and supplies it as a digital video signal to the video signal compressor 30 of each channel.

The video signal compression section 30 of each channel subjects the digital video signal to compression processing corresponding to an image compression standard such as MPEG or JPEG, and then supplies it to the recording data processing section 34.

In the recording data processing unit 34, under the control of the recording control unit 74 of the system control unit 70, control signals such as various IDs are added to the compressed digital video signal in a predetermined format, and the recording medium 40, for example, a flash memory Supply to equipment. The recording medium is not limited to a flash memory device, but may be a hard disk device or a magneto-optical disk device.

FIG. 2 shows a format example (for one field) of a digital video signal to which a control signal is added. Each field is configured to include a control signal region and a video signal region. The control signal includes, for example, an address signal, a next address signal, a previous address signal, and the like. As the address signal, a signal corresponding to the address of the recording medium to which this field is written is written. In the next address number, a signal corresponding to the address of the recording medium in which the next field is written is written. In the previous address number, a signal corresponding to the address of the recording medium in which the previous field exists is written. A predetermined address is specified in advance as an address at which the first field in each channel is written.

Under the control of the recording control unit 74 of the system control unit 70, an address code, a next address signal, and a previous address signal of the above-described control signals are stored in the recording medium 40 as address codes,
A video identification code including the next address code and the previous address code is recorded together with the compressed digital video signal as a unit for each field.

Next, the configuration and operation of the multi-channel recording / reproducing apparatus 10 as a reproducing apparatus will be described. As shown in FIG. 1, the configuration of the playback device includes a recording medium 40, a playback data processing unit 44, a video signal decompression unit 52, a D / A conversion unit 56, a video signal output unit 60, and a playback control signal input unit 4.
2, and a system control unit 70 for controlling these units
The reproduction control unit 78 of FIG.

As described above, the recording medium 40 shown in FIG.
The data corresponding to the control signal and the digital video signal in the format shown in FIG. That is, a control code including an address code, a next address code, and a previous address code is recorded on the recording medium 40 together with the compressed digital video signal as a unit for each field.

FIG. 4 is a block diagram showing a functional configuration of the system control unit 70. As shown in this figure, the playback control unit 78 includes a playback position information storage unit 82 and a playback position selection unit 80.

The reproduction position information storage section 82 stores the address code of the last reproduction position in a storage area 84 provided for each channel. For the unplayed channels, a predetermined address defined for each channel, that is, an address where the first field is recorded, is stored.

The reproduction position selection section 80 stores information on a reproduction selection channel which is a channel whose reproduction is selected, and a reproduction position information storage section 8 for the reproduction selection channel.
The reproduction start position is selected based on the address information stored in Step 2.

Next, the operation of the multi-channel recording / reproducing apparatus 10 configured as described above as a reproducing apparatus will be described with reference to the flowchart shown in FIG. The operation as the reproducing device can be performed in parallel with the operation as the recording device.

When the reproduction of a predetermined channel is selected by the input to the reproduction control signal input section 42 (S1),
The reproduction position information storage unit 82 corresponding to the selected channel
The reproduction position selection unit 80 reads out the address code stored in the storage area 84 of (2) (S2). Then, under the control of the reproduction control unit 78, data corresponding to one field recorded at the address position is read from the recording medium 40 (S3).

The read data is supplied to a reproduction data processing section 44. The reproduction data processing unit 44 generates a signal from the data read from the recording medium 40 and supplies the signal to the video signal decompression unit 52 as a compressed digital video signal. In this signal generation, for example, processing such as error correction and data rearrangement is performed in accordance with the reproduction format (S4).

Next, in the video signal decompression section 52, the digital video signal supplied from the reproduction data processing section 44 is subjected to decompression processing corresponding to the used compression standard such as MPEG, JPEG, etc. It is supplied to the A conversion unit 56 (S5).

The video signal that has been subjected to the D / A conversion in the D / A converter 56 is supplied to a video signal output unit 60,
After the image processing is performed, it is output as a video signal output (S6).

At this stage, the reproduction control unit 78 checks whether there is a change in the selected channel input from the reproduction control signal input unit 42 (S7).

As a result, if there is no change in the selected channel, the data of one field at the address of the next address code (see FIG. 2) is read (S8), and the process returns to step S4 to reproduce the read data. The data is supplied to the data processing unit 44, and thereafter, the subsequent steps are repeated as described above.

If there is a change in the selected channel, the address code at the stop position on the selected channel before the change is stored in the storage area 84 of the channel in the reproduction position information storage unit 82, and the process returns to step S2 to newly execute the process. Then, the address code at the previous stop position of the selected channel is read, and thereafter the operation is performed in the same steps as described above.

As described above, according to the multi-channel recording / reproducing apparatus according to the present embodiment, in reproducing the multi-channel video recorded on the randomly accessible recording medium 40, the reproduction position information storage unit 82 stores each channel. The reproduction position selection unit 80 selects the reproduction start position in the channel selected for reproduction based on the address code of the last reproduction position stored in the. Therefore, in the reproduction of the multi-channel video, the reproduced video is continuous in each channel even if the video is switched between channels.

In addition, in the reproduction performed simultaneously with the recording of the multi-channel video, the reproduced video is continuous in each channel even if the channels are switched.

2. <Modification> 2.1 In the above-described embodiment, each input unit 14
1 shows an example in which an analog video signal is input to the device and the video signal output unit 60 outputs the analog video signal. However, when a digital video signal is input to each input unit 14 and the digital signal is output from the video signal output unit 60, A
The / D conversion unit 22 and the D / A conversion unit 56 are not used, and the input units 14 and the video signal output unit 60 for digital signals are used.

2.2 In the embodiment described above,
The example in which the reproduction position information storage unit 82 stores the address on the recording medium 40 corresponding to the last reproduction position field for each channel has been described. Playback position information storage unit 8
2 may also store the address on the recording medium 40 corresponding to the field following the last reproduction position. As a result, when the recording on the recording medium 40 at the address of the last reproduction position cannot be used, the reproduction can be performed using the recording at the address corresponding to the subsequent field, and the reproduction may be interrupted. It drops significantly.

2.3 In the embodiment described above,
An example has been shown in which an address signal, a next address signal, and a previous address signal directly corresponding to the address of the recording medium 40 are used as control signals for each field. However, a signal indicating a channel and a signal indicating a field number are used as control signals for each field, and a table in which the field numbers correspond to the addresses on the recording medium is stored in the system control unit 70, and the reproduction position information is stored. The storage unit 82 may store the field number at the last reproduction position for each channel. With this, the same operation and effect as those of the above-described embodiment can be obtained.

2.4 The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention or within the equivalent scope of the claims.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a multi-channel recording / reproducing apparatus according to an embodiment.

FIG. 2 is an explanatory diagram showing a format example of a digital video signal for one field to which a video identification signal is added.

FIG. 3 is a block diagram illustrating a functional configuration of a system control unit.

FIG. 4 is a flowchart showing a reproducing operation of the multi-channel recording / reproducing apparatus according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Multi-channel recording / reproducing apparatus 12 Recording control signal input part 14 Input part 22 A / D conversion part 30 Video signal compression part 34 Recording data processing part 40 Recording medium 42 Reproduction control signal input part 44 Reproduction data processing part 52 Video signal decompression part 56 D / A conversion unit 60 Video signal output unit 70 System control unit 74 Recording control unit 78 Playback control unit 80 Playback position selection unit 82 Playback position information storage unit

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04N 5/92 H04N 5/92 C 5/93 5/93 Z F term (reference) 5C052 AA03 AB02 AB03 AC08 CC06 CC20 DD04 5C053 FA14 FA23 FA27 GA06 GB06 GB36 GB37 HA29 HA32 HA33 JA24 KA05 LA01 LA06 LA07 5D044 CC04 DE38 GK12 5D066 DA03 DA12 5D077 AA21 BA18 BB18 CA02 CB02 DC01 EA32 GA01

Claims (5)

[Claims] 1. A multi-channel reproducing apparatus for reproducing multi-channel video from a randomly accessible recording medium under the control of a reproduction control unit, wherein the recording medium has an address corresponding to a recording position on the recording medium. The video is recorded as an accumulation of fields including information and video information, the reproduction control unit includes: a reproduction position information storage unit that stores address information of a last reproduction position for each channel; A reproduction position selection unit that selects a reproduction start position based on information of a reproduction selection channel that is a channel that is selected, and the address information stored in the reproduction position information storage unit for the reproduction selection channel. A multi-channel playback device, comprising: 2. The multi-channel playback device according to claim 1, wherein the playback position information storage unit also stores address information of a field subsequent to the last playback position. 3. A multi-channel recording / reproducing apparatus which records / reproduces multi-channel video on a recording medium which can be randomly accessed under the control of a recording control unit and a reproduction control unit. As a collection of fields including address information and video information corresponding to the recording position, control is performed such that multi-channel video is recorded on the recording medium, and the reproduction control unit stores the address information of the last reproduction position. A reproduction position information storage unit for storing each channel, information of a reproduction selection channel that is a channel selected for reproduction, and the address information stored in the reproduction position information storage unit for the reproduction selection channel. And a playback position selection unit for selecting a playback start position based on the information. Raw equipment. 4. The multi-channel recording / reproducing apparatus according to claim 3, wherein the reproduction position information storage unit also stores address information of a field subsequent to the last reproduction position. 5. A multi-channel recording / reproducing method for recording / reproducing a multi-channel video on a recording medium which can be randomly accessed, comprising: an address code corresponding to a recording position on the recording medium; As an integration, multi-channel video is recorded on the recording medium, the address code of the last playback position is stored for each channel, and information on a playback selection channel that is a channel for which playback is selected, and the playback selection channel A reproduction start position is selected based on the address information stored for the multi-channel recording and reproduction method.