JP2002158964A - Method for recording and reproducing video signal and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a recording and reproducing device capable of performing a recording temporary stop operation for validly using a recording medium at the time of recording an encoded video signal in a recording medium such as a hard disk, and reproducing the just previous recorded signal, and viewing a delayed video. SOLUTION: When a recording temporary stop operation is performed, temporary stop picture units related with the reproduction are designated. When a temporary stop release operation is performed, release picture units related with the temporary stop operation release are designated by a recording medium management information generating means 57, the recording is continued even in a period in which the temporary stop operation is being performed, and the picture units between the designated picture units are erased after the recording is ended. Thus, it is possible to realize the video signal recording and reproducing device having a simultaneous recording and reproducing function for validly utilizing the storage area of the recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to recording a video and an audio signal obtained by receiving a TV broadcast on a recording medium such as a hard disk as a compression-encoded signal, and reading a video signal immediately after the recording. The present invention relates to a video signal recording / reproducing method and a video signal recording / reproducing apparatus having the simultaneous recording / reproducing function and the recording function having a pause function.

[0002]

2. Description of the Related Art A video signal recording / reproducing apparatus using a randomly accessible recording medium such as a hard disk as a recording medium can simultaneously record a plurality of TV broadcast programs because the access time for recording and reproduction is short. In addition, it has functions such as simultaneous recording and reproduction of video signals.

A video signal recording / reproducing apparatus having such a simultaneous recording / reproducing function is provided with convenient functions such as cache reproduction and chase reproduction in which a program being broadcast can be viewed while continuously shifting the time from the present to the past. It is considered to be introduced into the home together with a VTR used as a conventional time shift machine in the future.

[0004] In the conventional monitor of a recording signal in a VTR, a recording signal supplied to the VTR is directly supplied to a monitor TV for viewing, and the monitor video is a signal being recorded. Can be monitored, but it is impossible to know how the image is actually recorded on the recording medium, whether the image quality of the recorded image is degraded, or whether recording is not performed due to some cause, or the like.

On the other hand, in a recording / reproducing apparatus having a simultaneous recording / reproducing function, recording can be performed while reproducing a video being recorded in real time, so that a recording failure can be known at that time, and a recording error can be minimized. It has features such as being able to be suppressed.

[0006] Furthermore, when there is an image to be watched again or missed during recording, the past image can be viewed with a simple operation. PVR (personal video recorde) with such functions
r) has also been developed.

[0007]

The conventional VT
When recording the video signal supplied by R on the video tape, the video tape has a function of stopping the running of the video tape when recording is temporarily stopped and running the tape again when resuming the recording.

At this time, the video signal supplied to the monitor TV is the same as the video signal supplied to the VTR.
V is supplied to the V. During the recording and during the pause, the supplied video is continuously displayed.

When such a recording / pausing operation of a conventional VTR is performed by a recording / reproducing apparatus having a simultaneous recording / reproducing function for stopping recording during a pause operation, the pause operation is performed. When the recording operation is performed, the recording function is stopped, and the monitor signal of the signal supplied to the recording / reproducing apparatus is also temporarily stopped.

Therefore, even when the recording operation is performed using the simultaneous recording / reproducing function, operations such as temporarily stopping the recording and canceling the recording are performed while watching the monitor screen of the supplied video signal. It is necessary to realize a video signal recording / reproducing device capable of recording a desired video signal on a medium.

Therefore, according to the present invention, in a video signal recording / reproducing apparatus having a convenient function such as a simultaneous recording / reproducing function, a video signal output for real-time monitoring may be in a pause state even by a pause operation during recording. Recording / reproducing method of video signal equipped with convenient functions such as being able to perform recording operation without interruption and being able to continuously play back video recorded in the past during recording, and video signal recording equipped with such function It is intended to provide a configuration of a playback device.

[0012]

According to the present invention, there is provided a video signal recording apparatus, a video signal reproducing apparatus, and a video signal recording / reproducing apparatus.
In order to solve the above-mentioned problems, the method comprises the following 1) to 6). That is,

1) The supplied video signal is compression-encoded to obtain an encoded signal, and the obtained encoded signal or the supplied encoded signal is stored in a recording medium that can be randomly accessed for each predetermined image unit. While recording, the encoded signal immediately after recording is read, the read signal is decoded to obtain a video signal, and the obtained video signal is output. A first step (79) of generating a recording pause signal when a recording pause operation is performed, and applying the video signal being reproduced when the recording pause signal is generated by the first step. A second step (57) for designating the position of the image unit as a pause image position, and a release signal is generated when a release operation of the pause operation performed in the first step is performed. A third step (79), and a fourth step of designating the position of the image unit related to the video signal being reproduced when the release signal is generated by the third step as a stop release image position ( 57)
The paused image position specified in the second step,
A fifth step (57, 58, 61, 63) of erasing recording information in image units located between the stop release image position designated in the fourth step and the stop release image position. A method for recording and reproducing signals.

2) The recording / reproducing method of the video signal according to 1), wherein the release signal in the third step is generated when the pause operation is performed and a predetermined time has elapsed.

[0015] 3) The image unit specified as the stop release image position in the fourth step is a step of performing a position specification including a position specification that is a start position of a discontinuous encoded signal. The video signal recording / reproducing method according to 1) or 2).

4) The supplied video signal is compression-encoded to obtain an encoded signal, and the obtained encoded signal or the supplied encoded signal is stored in a recording medium that can be randomly accessed for each predetermined image unit. In the video signal recording / reproducing device for recording and reading out the coded signal immediately after the recording and decoding the read out signal and outputting the video signal, the recording operation of the coded signal is temporarily stopped or stopped. When an operation for canceling an operation is performed, an operation signal generating means (79) for generating a recording pause signal or a pause release signal corresponding to the operation, and the operation signal generating means generates the recording pause signal. The position of the image unit relating to the image being reproduced at the time of generation is designated as a pause image position, and the reproduction is performed at the time of generation of the pause release signal. A position designation unit (57) for designating the position of the image unit relating to a certain image as a pause release image position, an image unit of the pause image position designated by the position designation unit, and designated by the position designation unit Recording information erasing means (57, 61, 63, 65) for erasing the recording information of the image unit recorded between the image unit and the image of the pause release image position. Video signal recording and reproducing device.

5) The operation signal generating means is configured to have a function of generating a pause release signal when a predetermined time has elapsed after the recording pause operation was performed. The video signal recording / reproducing apparatus according to the above.

6) The supplied video signal is compression-encoded to obtain an encoded signal, and the obtained encoded signal or the supplied encoded signal is recorded on a recording medium that can be randomly accessed for each predetermined image unit. In the video signal recording / reproducing device for recording and reading out the coded signal immediately after the recording and decoding the read out signal and outputting the video signal, the recording operation of the coded signal is temporarily stopped or stopped. When an operation for canceling an operation is performed, an operation signal generating means (79) for generating a recording pause signal or a pause release signal corresponding to the operation, and the operation signal generating means generates the recording pause signal. The position of the image unit relating to the image being reproduced at the time of generation is designated as a pause image position, and the reproduction is performed at the time of generation of the pause release signal. A position designation unit (57) for designating the position of the image unit relating to a certain image as a pause release image position, an image unit of the pause image position designated by the position designation unit, and designated by the position designation unit Recording information erasing means (57, 61, 63, 65) for erasing the recording information of the image unit recorded between the image unit of the pause release image position and the image unit management information of the pause release image position And a management information adding means (57) for adding position designation management information indicating the start position of the discontinuous coded signal.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a video signal recording / reproducing method and a video signal recording / reproducing apparatus according to the present invention will be described below. FIG. 1 shows a schematic block diagram of a video signal recording / reproducing apparatus that records and reproduces a video signal on a hard disk, first outlines its configuration and operation during normal recording, and then describes a recording pause operation.

The video signal recording / reproducing apparatus 40 shown in FIG. 1 comprises a recording section 50, a medium section 60, and a reproducing section 70. A monitor TV 90 is connected to the reproducing section 70 by wire, and the recording section 50 and the reproducing section With respect to the operation performed on 70, the content of the operation performed by the viewer is transmitted to the reproduction unit 70 by infrared rays using the remote control 95.

First, the recording unit 50 comprises a TV tuner 51, A
It comprises a / D converter 52, an MPEG-2 encoder 53, a stream analyzer 54, a REC-FIFO 55, a header detector 56, a microcomputer 57, and a temporary storage memory 58.

The medium unit 60 includes a hard disk recording / reproducing unit 61, a hard disk 63, and a read / write controller 65. The reproducing unit 70 includes a buffer memory 7
1, an MPEG-2 decoder 72, an OSD 73, a D / A converter 74, a microcomputer 76, a temporary storage memory 78, and a remote control interface 79.

Next, the operation of the video signal recording / reproducing apparatus 40 configured as described above will be outlined. First, the TV tuner 51 receives a video signal of a reception channel set by the remote controller 95 or the like from among the broadcast waves coming from the antenna, and supplies the received video signal to the A / D converter 52. MPEG-
2 encoder 53.

In the MPEG-2 encoder 53, the supplied signal is an ISO / IEC (International Organization).
zation for Standardization / International Electro
MPEG-2 (mo
ving picture experts group-2) Compression-encoded according to the standard, and the compression-encoded signal is supplied to a stream analyzer 54 and a header detector 56 described later.

In the stream analyzer 54, the format of the compression-coded signal is analyzed, and the coded information signal obtained by the analysis and the supplied compressed coded signal are analyzed by the RE.
It is supplied to the C-FIFO 55.

The REC-FIFO 55 records (REC: re
A first-in first-out (FIFO) operation of a cording signal, that is, a circuit that temporarily stores an input signal and outputs the signal in the order of supply, and the signal supplied from this circuit is supplied to a hard disk recording / reproducing device 61. Is done.

In the hard disk recording / reproducing device 61,
The supplied signal is a signal divided for each sector size for recording on the hard disk 63, and the divided signal is supplied to the hard disk 63 which is operationally controlled by the write / read controller 65, and the supplied signal is It is recorded on a disc-shaped recording medium (not shown) of the hard disk 63.

Then, the above-mentioned header detector 56
From a signal encoded by EG-2, for example, a GOP (Group
of picture), and the supplied encoded information is supplied to the microcomputer 57.

In the microcomputer 57, hard disk management information for smoothly recording and reproducing information on the hard disk 63 is generated based on the supplied encoded information, and the generated management information is stored in the temporary storage memory 58. The hard disk management information temporarily stored is recorded on the hard disk 63 via the hard disk recording / reproducing device 61 as appropriate.

In this manner, the received channel video signal and the above-mentioned hard disk management information are recorded on the hard disk 63, and the supplied and recorded video signal is transmitted to another recording medium such as a VTR. When the signal is an analog signal, the video signal is supplied to the A / D converter 52, where the same processing is performed and the video signal is recorded on the hard disk 63.

If the video signal to be recorded is, for example, B
MPEG in advance for S digital broadcasting, digital terrestrial broadcasting, etc.
If the signal is encoded by a method such as -2,
The encoded signal is directly supplied to the stream analyzer 54 and the header detector 56 without passing through the MPEG-2 encoder, and is subjected to the same signal processing to be recorded on the hard disk 63.

Note that the MPEG-2 encoder 53 is a GO
When a function capable of supplying encoded information corresponding to the configuration of P or the like or when encoded information such as a GOP is supplied as auxiliary information in digital broadcasting or the like, the information is supplied to the header detector 56. The header detector 56 generates encoded information based on the information, and the microcomputer 57
May be supplied.

A video signal recorded on an analog TV broadcast, a digital video broadcast, or another recording medium in this manner is a compression-encoded video signal, and the video signal is recorded on the hard disk 63 together with management information. .

Next, the reproduction of the recorded signal of the hard disk 63 thus recorded will be described. First, when the play button is operated by the remote control 95, the operation content is transmitted to the remote control interface 79 by a modulated infrared ray, and the operation content of the remote control key is supplied to the microcomputer 76.

From the microcomputer 76, a control signal generated in accordance with the operation content is supplied to the write / read control circuit 65.
The hard disk 63 is controlled by a write / read controller 65, and the hard disk 63 reads a signal at a specified location, and the read signal is supplied to a hard disk recording / reproducing device 61.

The hard disk recording / reproducing device 61 amplifies the signal read from the hard disk 63 and corrects the characteristics, and the like, and the signal whose characteristics are corrected is supplied to the buffer memory 71.

In this case, the compression-encoded signal is temporarily stored, and in response to a request from the MPEG-2 decoder, the temporarily stored signal is read out and stored in the MPEG-2 decoder 7.
2 is supplied.

In the MPEG-2 decoder 72, the supplied signal is decoded in accordance with the MPEG-2 standard by a method complementary to the compression and encoding performed by the encoder 53.
The digital video signal obtained by decoding may be replaced with information such as, for example, that recording is temporarily stopped.
(On Screen Display) 73 multiplexes a display signal to be displayed on the display device, and a multiplexed digital video signal of the display signal is supplied to a D / A converter 74 to be converted into an analog video signal, and the converted analog video signal is converted. The video signal is supplied to the monitor TV 90 and displayed.

The display signal multiplexed on the OSD 73 is a video RA (not shown) built in the OSD 73.
The signal stored in M or the temporary storage memory 78
The display content information stored in the
The display signal which is supplied to the D 73 and the OSD 73 generates based on the supplied information is multiplexed with the video signal supplied from the MPEG-2 decoder 72 and displayed.

In this way, the supplied video signal is encoded by the MPEG-2 system using the intra-frame compression and motion compensation techniques, and
3, the signal recorded on the hard disk 63 is decoded by the MPEG-2 decoder. Next, an image signal handled in the MPEG-2 system will be described.

FIG. 2 shows the types of images handled by the MPEG-2 system. In the figure, frame images (pictures) constituting a video signal are arranged in the time direction with names of I, B, and P, and the I is an intra-coded I (Intra-coded). ) A frame (picture).

P is a P (Predictive) that is predictively encoded in one direction as indicated by an arrow at the bottom of the figure.
and B is a B (Bidirectionally predictive-co) in which a motion prediction vector is obtained and encoded from both the past and future directions.
ded) frame.

As described above, an image encoded by MPEG-2 is composed of frame images having three types of properties. For example, I frames are arranged every 15 frames. A group of 15 frame images up to the start of the I-frame of
Picture).

The reason why an image is treated as a unit of the GOP is that an image encoded in this way is decoded by decoding an I frame, and then decoding P and B frames. GO needs to decode the frame
This is because an I frame is arranged at the head of P.

If the I-frame has not been decoded, the subsequent P-frame and B-frame cannot be decoded, and the incoming data is decoded in the next GOP.
Is decoded after waiting for the data of the I frame.

The GOP interval at that time is 15 frames when N = 15, ie, NTSC (na
nation television system committee color televisio
In the case of a video signal having 30 frames per second as in (n system), a GOP signal encoded every 0.5 seconds (15/30 = 0.5) is obtained and decoded.

Therefore, for example, in order to read data recorded on the hard disk 63 and immediately decode the data, GO
It is necessary to obtain the first data of P by accessing it. For this purpose, management information indicating the first part of the GOP is used to shorten the decoding time.

By using the management information, a video signal recording / reproducing apparatus which records and reproduces an image signal encoded on a hard disk at a high speed can simultaneously perform signal recording and reproducing operations. Thus, recording and reproduction at a remote position on the hard disk can be performed simultaneously.

The functions that can be realized by the simultaneous recording / reproducing are so-called follow-up reproduction, in which the currently recorded program is simultaneously reproduced while recording the previously recorded portion, and video / audio information sequentially stored in a bit stream recording area for a predetermined time. When recording to the end of the area, the oldest record in the area should be overwritten with new information and recorded, and video and audio information for a predetermined time should be played back in the past. There is a cache replay that can be done.

The cache recording / reproduction is performed by reproducing the video immediately after the recording. Normally, the reproduced video immediately after the recording is viewed as a real-time image, and the real-time video by the operation of the viewer is changed to the video recorded in the past. This is a function to play back while continuously shifting the time.

Here, the state reproduced as a real-time image is referred to as a live state, and a reproduction operation in cache recording / reproduction is performed while continuously sweeping between the live state and a previously recorded image. The switching from the live video to the past video is performed smoothly.

That is, instead of the live video, M
It is conceivable to use the input signal to the apparatus without performing the PEG-2 encoding, decoding, and recording / reproducing processing on the hard disk. In such a case, it is possible to use an MPEG-PEG signal between the input signal and the live signal. 2, a delay time difference occurs as a processing time in encoding, decoding, and recording / reproducing to / from the hard disk, and a smooth transition from the current video (live state) to the past video cannot be performed.

For this reason, in particular, when the signal is switched when performing playback going back from the real-time viewing state to the past, a temporal discontinuity occurs, and the image is momentarily disturbed or the picture is skipped. Video cannot be displayed due to the smooth connection to the viewer, which gives the viewer an unnatural feeling.

Therefore, in the cache recording / reproducing when a hard disk is used, in order to reproduce the video recorded shortly before while continuing the recording, the current video to the past video are continuously reproduced by a simple operation. Such a reproduction function is realized by reproducing a live video as a current video.

Next, a description will be given of a video recording / reproducing apparatus having a convenient simultaneous recording / reproducing function, such as the cache recording / reproducing function, for temporarily stopping recording.

As described above, in the video signal recording / reproducing apparatus having the simultaneous recording / reproducing function, recording can be performed while confirming the recorded video by reproduction, and when the video being recorded needs to be watched again. It has features such as the ability to view past videos while continuing to record.

Even when the apparatus performs a pause operation at the time of recording, it is necessary to supply a video signal supplied for performing the recording pause release operation as a monitor signal.

However, when the recording operation is paused in the recording / reproducing apparatus which is still operating by the simultaneous recording / reproducing function, the reproduction signal output is set to the pause screen at the screen at the time of the pause operation, and the video supplied thereafter. No signal is supplied.

Therefore, in order to supply the video signal supplied as a monitor output even during the pause operation, the video signal supplied as an input signal to the apparatus in place of the simultaneous recording / reproducing signal when the pause operation is performed. Although there is a method of supplying a monitor signal to a display, there is a time difference of, for example, 3 seconds between the simultaneous recording / reproducing signal and the video signal supplied to the apparatus as described above. A discontinuous video signal is displayed, which is not preferable.

In order to prevent the video signal from being displayed as a discontinuous temporal signal, for example, there is a method of displaying the video signal supplied to the device through a delay circuit of about 3 seconds. Can prevent intermittent video display caused by the delay time difference.

However, the operation of releasing the recording suspension while monitoring the delayed video signal is performed after the video signal to be recorded for the delay time (about 3 seconds) has already been supplied. However, the video signal for the delay time is not recorded on the recording medium, which is not preferable.

As described above, even when the recording operation is temporarily stopped while the monitor image is displayed in the simultaneous recording / reproduction mode, the recording of the video signal supplied to the apparatus is continued on the recording medium. There is a need to do.

Further, if the video signal is continuously recorded on the recording medium even during the pause operation, an unnecessary video signal is recorded on the recording medium having a limited capacity.
After the end of the recording operation, the video signal in the section where the pause operation was performed is erased, and the recording medium is effectively used.

Next, an operation in the case where the bit stream generated by the MPEG-2 encoder 53 is recorded with a temporary stop function on the hard disk 63 in which the area is managed by the sector and the like and performs the recording operation will be described. FIG. 3 shows that a recording medium having a sector configuration uses MPEG.
2 shows an example of recording a GOP signal encoded by -2.

In the figure, (1) shows a sector area of a hard disk by a number, (2) shows a GOP signal encoded by MPEG-2 by a number, and (3) shows a sector area of (1). The state where the GOP signal of (2) is recorded is shown in a positional relationship.

As described above, the GOP signal having a variable amount of data and having a different data amount is recorded in the recording area of the sector structure having a fixed capacity on the hard disk.

In this example, data of a GOP is continuously recorded in a continuously existing cluster. To reproduce the recorded GOP data, the cluster number in which the GOP is recorded is determined by disc management information. Access the group,
Next, the target GOP data recorded in the cluster is reproduced to obtain a video signal.

Next, the G thus recorded and reproduced is
The operation of temporarily stopping recording of OP data will be described. FIG. 4 schematically shows a recording pause operation performed on a video signal composed of GOP data.

In the figure, (4) the pause position is set by
The above-mentioned (2) illustrates a point in time when a recording pause operation (pause setting) is performed on the GOP signal and a point in time when the setting is canceled (pause release).

That is, the pause is set to the 201st GOP
The data and the pause release are the 210th data. At this time, 20 existing between those data
The second to 209th GOP data is data that does not need to be stored in the hard disk 63 and is erased at the end of the recording operation.

In the data erasure, the 202nd GOP data (hereinafter, referred to as GOP 202) of the 101st cluster (hereinafter, referred to as cluster 101) is made empty, and
Clusters subsequent to the cluster 102 in which the data 203 is recorded are in an erased state so that other recording data can be written as necessary.

Similarly, GOP2 on the cluster 106
09 is vacant, and the cluster 10
5 and before are in the erased state. Thus, cluster 1
From 02, the cluster 105 is put into an erased state, and information of a cluster in which such new data can be recorded is stored in the disk management information.

The reproduction of the GOP data recorded in this manner is performed based on (5) the arrangement of reproduced data. That is, the data before the cluster 200 is G
The operation is performed up to the pause set point of the OP 201, and the GOP data of the subsequent video is searched by the write / read controller 65 in the cluster 106, the data of the GOP 210 is read, and the reproduction is resumed from the pause release position of the reproduced video. .

At this time, the above operation is performed until the video of the set point is reproduced after the video of the set point. However, it is not preferable that the video is interrupted due to the operation period. G stored in the buffer memory 71
The video at the time of the pause release is reproduced before the reproduction of the video of OP201 ends, so that there is no waiting time between the pause and the time.

In this manner, the data after the pause release point is reproduced, but the first part of the GOP 210 is discontinuous data because the part in front of the GOP 210 is empty, and the first part of the GOP 210 is Need to add a discontinuity mark.

That is, since the data recorded on the hard disk is not the data recorded from the middle of a defect or the like on the hard disk medium, the discontinuous mark is added to the recorded data.
For example, PTM (pulse ti
This prevents the decoding failure of the GOP data due to the discontinuity of me modulation).

As described above, the video data of the GOP 210 starts to be read from the I frame recorded in the first part of the GOP 201, is normally decoded by the MPEG-2 decoder 72, and a normal video signal is output from the pause release point. Will be obtained.

For the management of the GOP number for this purpose, the operation signal from the remote controller interface 79 is supplied to the microcomputer 57, and the microcomputer 57 checks the GOP number information supplied from the header detector 56 with the GOP number information. At the same time, the sector number information of the hard disk in which the signal is recorded is read out from the hard disk 63, and is sent to the temporary storage memory 5 via the hard disk recording / reproducing device 61.
8 and the obtained sector number information and GOP number information are stored in the microcomputer 57.
Is generated as disc management information, and is recorded in a disc management information recording area (not shown) of the hard disk 63.

The recording and reproducing operations when the pause start position is set and the pause release is set have been described above. However, the pause release operation for the pause setting performed by the viewer may not be performed.

At this time, the microcomputer 57 continues the operation for erasing the recorded data. However, the continuation of the operation may cause an undesired operation such that all the latter half of the recorded data is erased. .

The normal stop time of the recording operation is, for example, several minutes during which a commercial message (CM) is continuously received. For example, 5 minutes is set as a predetermined time.
If the pause release operation is not performed after the elapse of the predetermined time, the remote controller interface 79 or the microcomputer 5
7 is provided with a timer function, and a pause release signal is generated at that time.

In this way, the encoded data recorded by performing the pause operation and the pause release operation is recorded after the recording is completed or when the power of the recording / reproducing apparatus is turned off and turned on again. The GOP data recorded on the hard disk 63 is erased based on the disc management information, and a new video signal or the like is recorded in the erased portion.

Since the new recording is performed in units of clusters, the portion where the GOP data is vacant in the cluster area remains empty, but the pause setting position,
Since the pause release position is specified correctly, the intermittent reproduction time of the pause section can be set to “0” by the above operation.

According to the recording pause operation as shown in this example, the video signal recorded and reproduced on the hard disk can be monitored even during the recording suspension period, so that the image quality of the recording state can be checked and the delay can be checked. The pause position and its release position can be specified while watching the monitor video that is played back after playback, so that the precise position can be specified, and the recording area of the hard disk to erase the video signal corresponding to the pause operation after recording is completed. Can be used efficiently and the recording area can be used efficiently.

As described above, the video signal recording / reproducing method for simultaneously recording and reproducing a video signal having a pause function and high utilization efficiency of a recording medium, and the configuration and operation of the video signal recording / reproducing apparatus have been described. The video signal recording device 40 is
There is a method of configuring the video signal recording device including the recording unit 50 and the medium unit 60, and configuring the reproducing unit 70 as a video signal reproducing device.

The video signal recording device and the video signal reproducing device can be installed at different locations, and the devices installed at distant locations can be connected and operated by a home network or the like.

The video signal recording device at that time is set as a home server and installed in the home, a video signal reproducing device is connected to the home server via a home network, and the video signal reproducing device is installed in a room where a monitor television is installed. Each is installed as a plurality of set-top boxes.

In this case, the home server is configured as a bit stream transmitting device, and the set-top box is configured as a bit stream receiving terminal. The two are connected by a high-speed wireless LAN or a home LAN, and perform two-way communication on a hard disk. The video signal information to be recorded is recorded and played back via a set-top box operated by a user according to an operation command from each room, and the supplied video signal is viewed on a monitor TV. To do.

As described above, when the recording device and the reproducing unit as the transmitting terminal and the receiving terminal are installed in remote places and operated by being connected by the communication means, the plurality of transmitting terminals and the plurality of receiving terminals are connected to the network. It is also possible to configure a network-type video system that is operated by being combined with the above.

Further, the recording medium used for the medium section has been described mainly on a hard disk. However, the recording medium is a medium that can be accessed at a high speed, for example, a magneto-optical disk, a RAM,
Also, the present invention can be applied to an apparatus using other recording media, such as a DVD or an RW DVD, and a semiconductor memory recording medium.

The encoding method of the video signal is MPEG-
Although the two methods have been described as examples, the compression coding method is not limited to this, and a method based on intra-frame coding, commonly called motion JPEG, or an MPEG-4 method, MPE
G-7 system, MPEG-2 to be standardized
In a case where a delay time due to processing occurs in compression encoding and decoding, such as a method using a fractal compression method, or a method using a fractal compression method, a video signal recording / reproducing apparatus to which the above-described technology is applied can be configured.

[0092]

According to the first aspect of the present invention, when a compression-encoded video signal having the simultaneous recording / reproducing / recording / reproducing function is recorded in a predetermined image unit and reproduced, the recording is performed. When an operation to pause the operation is performed, a recording pause signal is generated when the recording of the encoded signal is paused, and recording is performed based on the generated recording pause signal. A position of a certain image unit is designated as a pause image position, and a release signal is generated when a release operation of the recording pause operation is performed, and the image whose pause is released based on the generated release signal is generated. The position of the unit is designated as the stop release image position, and when the recording of the video signal specified in this way is completed, from the next image unit of the pause image position, the image unit immediately before the stop release image position Since the recorded information in the image unit recorded up to that point is erased, it is possible to monitor the encoded video signal recorded and reproduced on the recording medium during the recording operation even if the recording is paused. In addition to being able to confirm, it is possible to accurately specify the recording pause position and the release position for monitor video that is reproduced with delay due to encoding and decoding. There is an effect that it is possible to provide a recording / reproducing method of a video signal which can effectively use a recording area of a recording medium for erasing.

According to the second aspect of the present invention, in addition to the effect of the first aspect, even when the operation of canceling the recording suspension is not performed for some reason, recording is automatically performed after a predetermined time has elapsed. Since the pause release operation is performed, it is possible to prevent the operation of erasing all the latter half of the recorded content after setting the recording pause by mistake, and to always check the image quality of the recorded state, and to achieve accurate recording It is possible to provide a recording / reproducing method of a video signal in which a pause start position can be specified, and a video signal for a predetermined time is erased after recording is completed, so that a recording area of a recording medium can be effectively used.

According to the third aspect of the invention, in addition to the effects of the first and second aspects, discontinuity of the recording medium caused by erasing a signal during a recording stop period of a recorded video signal is obtained. In order to add a discontinuous mark to the media management information of the recording position of the video signal from which recording is resumed,
Since the discontinuous recording portion can indicate that it is not a discontinuous portion related to a defect on the medium, even if the PTM discontinuity occurs at the time of reproducing the recording medium, the reading process of the recording medium ignoring the discontinuity is performed. The present invention provides a video signal recording / reproducing method which has a simultaneous recording / reproducing function and can effectively use a recording area of a recording medium, which can prevent a decoding failure or the like of an encoded video signal beforehand. There is an effect that can be.

According to the fourth aspect of the present invention, a video signal having a simultaneous recording / reproducing / recording / reproducing function and recorded in a predetermined image unit by compression-encoding is reproduced and recorded. When an operation of suspending the recording operation of the apparatus is performed, a recording pause signal is generated by an operation signal generating unit that generates a pause release signal, and recording is performed based on the generated recording pause signal. The position of the image unit in the middle is designated as a pause image position, and a release signal is generated when the release operation of the recording pause operation is performed, and the pause is released based on the generated release signal. The video signal is recorded in such a manner that the position of the image unit to be stopped is designated as the stop release image position. Since the recording information of the image unit recorded up to the image unit before the release image position is erased, the encoded video signal recorded and reproduced on the recording medium even during the recording pause even during the recording operation. By monitoring, the image quality of the recorded state can be confirmed, and the recording pause position and the release position can be accurately specified for the monitor video reproduced with delay due to encoding and decoding. There is an effect that it is possible to provide a configuration of a video signal recording / reproducing apparatus which can effectively use a recording area of a recording medium for erasing a video signal of a portion corresponding to a recording suspension.

According to the fifth aspect of the present invention, in addition to the effect of the fourth aspect, even if the operation of canceling the recording suspension is not performed for some reason, the operation signal generating means performs the predetermined time period. Since the recording pause release operation is automatically performed after the lapse of time, it is possible to prevent the operation of erasing all the latter half of the recorded contents after setting the recording pause, and to improve the image quality of the recording state. Provided is a video signal recording / reproducing apparatus which can always be checked, can accurately specify a recording pause start position, and can effectively use a recording area of a recording medium by erasing a video signal for a predetermined time after recording is completed. There is an effect that can be.

According to the sixth aspect of the present invention, a video signal which has a simultaneous recording / reproducing recording / reproducing function and is recorded in a predetermined image unit by a compression-encoded video signal is recorded and reproduced. When an operation of suspending the recording operation of the apparatus is performed, a recording pause signal is generated by an operation signal generating unit that generates a pause release signal, and recording is performed based on the generated recording pause signal. The position of the image unit in the middle is designated as a pause image position, and a release signal is generated when the release operation of the recording pause operation is performed, and the pause is released based on the generated release signal. The video signal is recorded in such a manner that the position of the image unit to be stopped is designated as the stop release image position. To just before the image units of releasing image position erases the recorded information of the image recorded units,
The discontinuity of the recording medium caused by the signal erasure is caused by adding a discontinuity mark to the medium management information at the recording position of the video signal at which the reproduction is resumed. Related to the non-continuous part, and the PTM generated when the recording medium is reproduced.
Even when the recording operation is discontinued, it is possible to perform the reading process of the recording medium ignoring the discontinuity, prevent the decoding failure of the encoded video signal, etc., and also temporarily stop the recording during the recording operation. Even if the video signal is recorded on the recording medium and reproduced, the quality of the recorded image can be checked by monitoring the encoded video signal. Provided is a configuration of a video signal recording / reproducing apparatus that can accurately specify a pause position and a release position thereof, and that can effectively use a recording area of a recording medium to erase a video signal of a portion corresponding to the recording pause after recording is completed. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a video signal recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing the structure of a frame signal to be encoded by performing motion compensation according to the MPEG-2 system.

FIG. 3 shows that a recording medium having a sector configuration uses MPEG-2.
FIG. 6 is a diagram illustrating an example of recording a GOP signal encoded by a GOP.

FIG. 4 is a diagram schematically showing a recording pause operation performed on a video signal composed of GOP data according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 40 video signal recording / reproducing device 50 recording unit 51 TV tuner 52 A / D converter 53 MPEG-2 encoder 54 stream analyzer 55 REC-FIFO 56 header detector 57 microcomputer 58 temporary storage memory 60 medium unit 61 hard disk recording / reproducing device 63 hard disk 65 Write / read controller 70 Playback unit 71 Buffer memory 72 MPEG-2 decoder 73 OSD 74 D / A converter 76 Microcomputer 78 Temporary storage memory 79 Remote control interface 90 Monitor TV 95 Remote control

Claims (6)

[Claims] An encoded signal is obtained by compression-encoding a supplied video signal, and the obtained encoded signal or the supplied encoded signal is recorded on a recording medium that can be randomly accessed for each predetermined image unit. While recording, the encoded signal immediately after recording is read, the read signal is decoded to obtain a video signal, and the obtained video signal is output. A first step of generating a recording pause signal when a recording pause operation is performed, and an image unit related to the video signal being reproduced when the recording pause signal is generated by the first step And a third step of generating a release signal when the release operation of the pause operation performed in the first step is performed. A fourth step of designating the position of the image unit related to the video signal being reproduced when the release signal is generated in the third step as a stop release image position; and Paused image position,
A fifth step of erasing recording information in image units between the stop release image position designated in the fourth step and a video signal recording / reproducing method. 2. The video signal recording / reproducing method according to claim 1, wherein the release signal in the third step is generated when the pause operation is performed and a predetermined time has elapsed. 3. The image processing apparatus according to claim 1, wherein the image unit specified as the stop release image position in the fourth step includes a position specification that is a start position of a discontinuous encoded signal. The method for recording and reproducing video signals according to claim 1. 4. A coded signal is obtained by compression-encoding a supplied video signal, and the obtained coded signal or the supplied coded signal is stored in a recording medium that can be randomly accessed for each predetermined image unit. In the video signal recording / reproducing device for recording and reading out the coded signal immediately after recording and decoding the read out signal and outputting the video signal, the recording operation of the coded signal is temporarily stopped or stopped. When an operation for releasing the operation is performed, a recording pause signal corresponding to the operation, or an operation signal generating unit that generates a pause release signal, and the recording pause signal is generated by the operation signal generating unit. At the same time, the position of the image unit relating to the image being reproduced is designated as a paused image position, and the position of the image being reproduced when the pause release signal is generated. Position designation means for designating the position of the image unit as a pause release image position, an image unit of the pause image position designated by the position designation means, and a pause release image position designated by the position designation means And a recording information erasing means for erasing recording information of an image unit recorded between the image unit and the video signal recording / reproducing apparatus. 5. The apparatus according to claim 4, wherein said operation signal generating means has a function of generating a pause release signal when a predetermined time has elapsed after the recording pause operation was performed. The video signal recording / reproducing apparatus according to the above. 6. A coded signal is obtained by compression-encoding a supplied video signal, and the obtained coded signal or the supplied coded signal is stored in a recording medium that can be randomly accessed for each predetermined image unit. In the video signal recording / reproducing device for recording and reading out the coded signal immediately after recording and decoding the read out signal and outputting the video signal, the recording operation of the coded signal is temporarily stopped or stopped. When an operation for releasing the operation is performed, a recording pause signal corresponding to the operation, or an operation signal generating unit that generates a pause release signal, and the recording pause signal is generated by the operation signal generating unit. At the same time, the position of the image unit relating to the image being reproduced is designated as a paused image position, and the position of the image being reproduced when the pause release signal is generated. Position designation means for designating the position of the image unit as a pause release image position, an image unit of the pause image position designated by the position designation means, and a pause release image position designated by the position designation means Recording information erasing means for erasing the recording information of the image unit recorded between the image unit and the image unit management information of the pause release image position, indicating that it is the start position of the discontinuous coded signal A video signal recording / reproducing apparatus comprising: at least management information adding means for adding position designation management information.