JP2002125187A - Recording and reproducing method for video signal, and video signal recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video signal recording and reproducing device that records video and audio onto a random accessible information signal recording medium such as a hard disk and displays a message without incongruity even for a video signal whose copy is inhibited when a signal closest to the recordings is reproduced. SOLUTION: In the case of recording a supplied video signal onto a recording medium 63 and reproducing a signal closest to recordings up to a signal recorded in the past through smooth time sweep, a copy control detection means 52 detects a recording permissible level attached to a video signal to be recorded, when a microcomputer 56 identifies inhibited copying, an OSD(On Screen Display device) 74 superimposes an information image stored in an OSD memory 58 on the video signal, and when the signal closest to the recording recorded in the recording medium is displayed in place of an input signal, a message denoting that the signal closest to the recordings is reproduced and no video signal is displayed is properly indicated on the OSD 74.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information signal recording medium such as a hard disk, and when an unsuitable signal is supplied, the operator is notified by an appropriate display. The present invention relates to a video signal recording / reproducing method and a video signal recording / reproducing apparatus.

[0002]

2. Description of the Related Art A video signal recording / reproducing apparatus using a randomly accessible information signal recording medium such as a hard disk as a recording medium can record a plurality of programs at the same time because the access time for recording and reproducing is short. It has functions such as simultaneous recording and reproduction of video signals.

A video signal recording / reproducing apparatus having such a function can be used for chase reproduction or the like in which reproduction is performed while catching up with a program being received while continuing to record a program which has already started recording. It has a convenient function and is introduced into the home together with a VTR used as a conventional time shift machine.

In a VTR using a video tape as a recording medium, simultaneous recording and reproduction, such as reproducing a video signal of an already recorded portion while recording a supplied video signal, cannot be performed, but random access is possible. A video signal recording apparatus using a simple recording medium can perform simultaneous recording and reproduction.

[0005] Simultaneous recording and reproduction with a simple configuration is such that while a supplied signal is displayed on a monitor TV, the signal is recorded and the user reproduces an image that is currently being recorded from a currently recorded image. When such an operation is performed, the function can be realized by switching the signal being displayed to a reproduction signal and then reproducing a video that goes back in the past.

However, when switching from a signal being recorded to a signal recorded on a recording medium for reproduction, the signal is switched to a signal passed through a recording circuit and a reproduction circuit. Since the delay time for signal processing and the delay time associated with encoding and decoding are displayed, even if the most recent signal recorded on the hard disk is reproduced, the signal being recorded and the hard disk Switching between recorded and reproduced signals is not performed smoothly.

Therefore, the latest recording point of the recorded signal supplied to the recording medium via the recording circuit is reproduced as the latest signal, and the reproduced video signal is currently supplied. A method is considered in which the signal is regarded as a signal and supplied to the display.

In such a recording and reproducing method, the reproduction time is slightly delayed even when the supplied signal is compared with the signal obtained by reproducing the most recently recorded signal. There is no difference in quality, and the signal processing for obtaining a reproduction signal and the operation of the circuit are the same as those for reproducing the recorded video signal, so that the user can view normally.

As described above, the video signal recording / reproducing apparatus using a recording medium such as a hard disk capable of random access has a feature that a set reproduction point can be accessed and reproduced in a short time. Also, the playback performed while returning backward, such as continuous playback from the video currently being recorded to the video recorded in the past, can be performed without switching the basic operation of the video signal recording / reproducing apparatus or the signal processing method. Therefore, the program can be continuously reproduced from the present to the past without any discontinuity.

[0010]

As described above, when video software is continuously played back from the present to the past, the case where the location to be played back is the location closest to the recording is regarded as real-time recording / playback, and the real-time recording is performed. The state in which re-execution is performed is referred to as a live state, and a case where the live state and a video signal recorded in the past are reproduced will be considered.

The video signal to be recorded / reproduced is a received broadcast program or a signal obtained by reproducing a signal recorded on a recording medium such as a DVD.
In the case of a received broadcast program, viewing restrictions are imposed depending on the age of the user, so-called parental locks, or a copy prohibition flag is added.

By the way, when such video software for which viewing restriction or copying is not permitted is supplied to the video signal recording and reproducing apparatus, the video signal recording and reproducing apparatus
The display or recording of the video with the viewing restriction or the identification code that is not permitted to copy is not performed.

That is, since the recording of the video signal supplied with the copy prohibition identification code is prohibited, the supplied image signal is replaced by, for example, a full-screen black signal or a predetermined color signal. During playback, "Recording could not be performed because copy prohibition was specified in the input signal."
There is a way to display a message like

However, when the user is watching in the "live state", the user recognizes that the user is watching the current video instead of recording, so that the video is supplied even though the video signal is supplied. Is not displayed, and the fact that the message that recording could not be displayed is different from the feeling of the user, and there is a problem that gives the user a sense of discomfort.

Accordingly, the present invention displays an explanation to the user with an appropriate message for such video software for which viewing restriction or copying is not permitted,
For video software that does not have such restrictions, recording and playback of video signals that can be played back continuously from the live video to the video in the past by smoothly shifting the playback time by the user's operation An object of the present invention is to provide a method and a configuration of a video signal recording / reproducing apparatus having the function.

[0016]

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) A video signal accompanied by a signal indicating a recording permission level of the program software is supplied. When the supplied video signal conforms to the permission level, the video signal is recorded on a recording medium. The most recent signal at the time of recording of the recorded signal, or a video signal recording and reproducing method to be supplied as a video signal output for monitoring a video signal obtained by reproducing the signal recorded earlier, A first step (52, 56) for determining whether or not the supplied video signal is a signal for which recording is permitted based on the recording permission level, and recording is not performed by the first step. When the permission is determined, the second step (54, 56, 58) of replacing the supplied video signal with a predetermined signal, and the second step Recording the obtained signal on the recording medium and supplying a signal including information indicating that the supplied video signal cannot be supplied as the video output for monitoring in the third step (56, 5).
8, 74), at least.

2) The signal including the information indicating that the supplied video signal cannot be supplied in the third step is a video signal obtained by reproducing the signal most recently recorded and the video signal recorded before the video signal. The video signal recording / reproducing method according to claim 1), wherein the video signal obtained by reproducing the signal is a signal of information that makes the monitoring output signal different in the case.

3) The method for recording / reproducing a video signal according to 1), wherein the recording permission level in the first step is a level relating to copy prohibition.

4) A video signal accompanied by a signal indicating a recording permission level of the program software is supplied. When the supplied video signal conforms to the permission level, the signal is recorded on a recording medium, and A video signal recording / reproducing device configured to supply as a video signal output for monitoring a most recent signal at the time of recording of the recorded signal, or a video signal obtained by reproducing a signal recorded before that, Recording determining means (52, 56) for determining whether or not the signal is a signal for which recording is permitted based on the recording permission level of the supplied video signal. When it is determined that
A signal replacement unit (54, 56, 58) for replacing a video signal to be recorded on the recording medium with a predetermined signal, and a message signal indicating that the supplied video signal cannot be supplied as a video output for monitoring. Message adding means (56, 58, 74) for supplying;
A video signal recording / reproducing apparatus characterized by comprising:

5) In the case where the message signal is a video signal obtained by reproducing the signal most recently recorded and a video signal obtained by reproducing a signal recorded before the signal, a monitoring output signal is made different. 4. The video signal recording / reproducing apparatus according to the item 4), wherein the video signal is an information signal.

6) When a video signal based on a plurality of signal standards is supplied, and the supplied video signal is a signal based on a recordable standard, the signal is used. A video signal based on a recordable standard is recorded on a recording medium, and is supplied as a video signal output for monitoring a video signal most recently recorded or a video signal obtained by reproducing a signal recorded before the video signal. Recording determining means (52, 56) for determining whether or not a supplied video signal is a signal based on a recordable standard
And a signal replacing means (54, 56, 58) for replacing the video signal to be recorded on the recording medium with a recordable signal when the recording determining means determines that recording is not possible.
Message signal adding means (56, 58, 74) for supplying, as the video output for monitoring, a message signal indicating that the supplied video signal is not a signal based on a display or recordable standard. And a video signal recording / reproducing apparatus.

[0023]

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 is a schematic block diagram showing a video signal recording / reproducing apparatus for recording and reproducing a video signal on a hard disk according to the embodiment.

Referring to FIG. 1, an image signal recording / reproducing apparatus 40 includes an encoder section for identifying a control signal for display and copy prohibition of a video signal supplied from a video signal input terminal 51 and encoding a permitted video signal. 50, a recording / reproducing unit 60 for recording the signal supplied from the encoder unit 50 on the hard disk and reproducing the signal recorded on the hard disk, a monitor of the supplied video signal, and the reproduced video signal reproduced by the recording / reproducing unit 60. And a decoder unit 70 for decoding the supplied signal to obtain a video signal.

The encoder unit 50 includes a video signal input terminal 51, a copy control signal detector 52, an A / D converter 5
3, MPEG-2 encoder 54, buffer memory 5
5, microcomputer 56, temporary storage memory 57, and OSD
(On Screen Display) memory 58, recording / reproducing unit 60 comprises hard disk recording / reproducing device 61 and hard disk 63, and decoder unit 70 comprises buffer memory 71, MPEG-2 decoder 72, D / A converter 7
3 and the OSD 74.

Next, the operation of the video signal recording / reproducing apparatus 40 configured as described above will be described. First, a video signal obtained by receiving a broadcast signal wave or a video signal obtained by reproducing an unrelated recording medium is input to a video signal input terminal 51.
Is supplied to a copy control detector 52 and an A / D converter 53 described later.

In the A / D converter, when the supplied video signal is an analog signal, the analog signal is converted to a digital signal, and the converted signal is converted to an MPEG signal.
2 encoder 54.

The MPEG-2 encoder 54 is controlled by the microcomputer 56, and if the supplied digital video signal is a video signal for which encoding is permitted, an ISO / IEC
(International Organization for Standardization /
The video signal is encoded according to an encoding standard defined by the International Electrotechnical Commission, and the encoded signal is converted into a bit stream signal in a predetermined format based on the standard, and the converted bit stream signal is converted. Are temporarily stored in the buffer memory 55.

The coded digital video signal forming a bit stream, which is temporarily stored in the buffer memory 55, is supplied to a hard disk recording / reproducing circuit 61 of a recording / reproducing section 60, where an error correction code is added, Signal processing such as digital modulation for recording is performed, and the bit stream signal subjected to such signal processing is supplied to the hard disk 63 and recorded on the hard disk 63.

The bit stream signal recorded on the hard disk 63 in this manner is read from the hard disk 63, and the read signal is supplied to a hard disk recording / reproducing circuit 61, where the digitally modulated signal is demodulated. The demodulated signal is subjected to signal processing such as correction of an error signal, and the bit stream signal subjected to the signal processing is temporarily stored in the buffer memory 71.

Here, the bit stream signal recorded on the hard disk 63 is temporarily stored in the buffer memory 55, and the reproduced bit stream signal is temporarily stored in the buffer memory 71.
Is for simultaneously recording and reproducing a bit stream signal.

That is, the recording and reproduction of the bit stream signal on the hard disk 63 are performed at the transfer rate of the bit stream signal generated by the MPEG-2 encoder at 2
By simultaneously storing the bit stream in the buffer memory 55 and the buffer memory 71 at a speed twice or more as high as that of the hard disk 63, the simultaneous recording of the bit stream is substantially performed, including the time spent for the access operation of the hard disk. , And reproduction.

In this way, the bit stream signal temporarily stored in the buffer memory is supplied to the MPEG-2 decoder 72 to obtain a coded video signal from the bit stream signal, and the coded video signal is Decoded by a predetermined method defined in MPEG-2,
The digital video signal obtained by decoding is supplied to a D / A converter 7.
3 and is converted into an analog signal. The converted signal is supplied to an OSD (On Screen Display) 74.

The OSD 74 superimposes character information on the video signal or replaces the video signal with character information based on an instruction from the microcomputer 56 on the analog video signal supplied from the D / A converter 73. And the processed video signal is supplied as a video output signal for displaying a video on a monitor TV 90 connected to the outside.

In this manner, the video signal supplied to the video signal input terminal is written to the hard disk 63, and the recorded signal is read and supplied to the monitor TV 90 via the OSD 74 for display. The displayed signals are only video signals that are not parental-controlled or copy-prohibited, and the video signals that are parental-control or copy-prohibited are not displayed, but instead text information is displayed. You.

The operation for a video signal for which viewing restriction or copying is prohibited will be described below. The above-described copy control detector 52 is a circuit for detecting such a video signal that is restricted in viewing or prohibited from being copied.

Here, when the video signal supplied to the copy control detector is an analog video signal, for a content in which the supplied video signal is prohibited from being copied, for example, Japanese Patent Laid-Open Publication No. 63-107281
No. “Video program copy protection method and device”
The video signal is processed according to the method disclosed in (1) and supplied.

In the signal processing for copy protection, a signal for preventing the normal operation of an AGC (Automatic Gain Control) circuit at the input of a video tape recorder to which the signal is supplied is used for vertical blanking. This is inserted into a plurality of lines during the period, so that the inserted signal does not allow normal copying of the video signal and dubbing of the recorded content. This is called a vision signal.

The above-described copy control detection circuit 52 detects a signal for causing such an AGC circuit to malfunction, and in order to prevent the supplied video signal from being recorded on the hard disk 63 when the signal is detected. belongs to.

That is, the copy control detection circuit 52 detects, for example, a macrovision signal from the supplied analog video signal, and when the signal is detected, determines that copy is prohibited and generates a copy prohibition signal. ,
The copy prohibition signal is supplied to the microcomputer 56, and the microcomputer 56 performs an operation for prohibiting the copy on the video signal recording / reproducing device 40.

As another method of performing an operation for prohibiting copying, digital information including information related to copy control, for example, CGMS is included in a signal of a predetermined number of scanning lines in a vertical blanking period of a supplied video signal. (Copy Gen
eration management system) -A signal is inserted, and the copy control detection circuit 52 detects the CGMS signal to supply copy prohibition information to the microcomputer 56. The processing method may be used.

The above is a case where the supplied video signal is an analog video signal. The supplied signal is, for example, a signal obtained by receiving a digital broadcast, and is supplied in a bit stream signal format defined by MPEG-2. A
A signal is supplied without passing through the / D converter 53 and the MPEG-2 encoder 54. In such a case, a GOP is output from the supplied MPEG-2 video / audio bit stream.
(Group of Picture) information, a copy control signal included in the video / audio bit stream, a so-called CGMS-D signal, is detected to determine whether or not a copy operation is possible, and the determined result is supplied to the microcomputer 56. To

The method of detecting and processing the copy inhibition signal relating to the analog video signal and the digital video signal has been described above. The signal supplied to the video signal input terminal 51 by such a method is in the copy inhibition state. Is detected, the MPEG-2 encoder 54
In response to an instruction from the microcomputer 56, the supplied video / audio signal is not encoded, and instead of the video signal, for example, a full-screen black, a one-color screen composed of a predetermined color, or a fixed-color picture The digital video signal is supplied to the buffer memory 55, and the audio signal is muted to output a digital signal corresponding to silence, so that the supplied video / audio signal is not recorded on the hard disk.

The bit stream signal of a single color image used in place of the video signal when the copy prohibition signal is detected is muted by the MPEG-2 encoder 54 instead of generating the bit stream signal therefor. The digital data of the audio signal and the bit stream signal of the single color image may be stored in a memory (not shown) in advance, and the signal recorded in the memory may be recorded on the hard disk 63.

The data to be recorded in the memory is recorded in a different place on the hard disk 63, and the recorded data is replaced by changing the management address value for managing the hard disk 63 to replace the recording signal. is there.

Although the video signal supplied in such a manner that copying is prohibited is not recorded on the hard disk 63, it is necessary to notify the user of such a situation. For this purpose, first, abnormal input signal information indicating that the signal supplied to the apparatus is a copy prohibition signal is created.

The abnormal input signal information constitutes management information to be described later. When the video signal recording / reproducing apparatus 40 does not perform the recording operation properly, the input signal is recorded normally including other causes. This is information indicating that it was not performed.

The information is not limited to the case where the information of copy prohibition is attached, when the recording is restricted based on the rating information attached to the program due to, for example, the presence or absence of a violent scene, and when the input video signal is For example, when the signal format is a format that cannot be handled by the video signal recording / reproducing device.

In the United States, the rating information is based on the EIA608A standard in the United States, from the viewpoint of keeping programs that may adversely affect young people from being viewed by persons under a predetermined age. This information is inserted and transmitted during the ranking period, and the receiver sets the level of the receiving device using a personal identification number, etc., so that programs with a rating higher than this can not be viewed. This is information called a rental lock.

The signal format of a video signal that cannot be normally recorded by the apparatus is, for example, a high-definition (HD) video signal which is a device dedicated to the NTSC system and has twice or more the number of scanning lines cannot be recorded as it is. Another cause is that the input signal supplied to the video signal input terminal 51 has a very unstable reception state such as a low reception electric field level of a connected tuner and the signal deterioration is so great that the synchronization signal cannot be reproduced. In addition, there is a case where an input signal is not supplied due to disconnection of a connection cable or the like.

The video signal recording / reproducing apparatus 40 shown in this example
According to the present invention, the cause of the inability of the device to record normally due to such a cause is described and managed according to the reason by using a code composed of a predetermined bit string indicating the cause.

FIG. 2 shows a table of the causes of such abnormalities and identification codes corresponding thereto. If a cause occurs that the device cannot record normally, the cause is analyzed and the cause is clarified by the codes shown in this table. A digital video signal of a picture such as a screen black or a fixed color is recorded on a hard disk or supplied as a video signal output for a monitor TV, and the sound accompanying the video is muted, and a digital signal corresponding to silence is converted to a digital signal. This prevents incoming video and audio signals from being recorded.

In this way, the cause of the case where the apparatus cannot perform normal recording is managed, and the operation of the apparatus is performed according to the cause. However, “one-time copy permitted” shown in the table is supplied. Since the video signal is permitted to be copied only once, the supplied video signal is recorded on the hard disk, but the recorded signal is reproduced and the reproduction signal output from the video signal recording / reproducing device is copy-prohibited. It is supplied with information identified as.

For example, when a video tape recorder (not shown) is incorporated as an integrated device into the video signal recording / reproducing apparatus, the management information is referred to when dubbing the recorded content of the hard disk 63 onto a video tape. , Is supplied as "copy once" so that the video signal recorded on the hard disk is not recorded (dubbed) on the video tape.

Here, the above-mentioned correspondence table between the cause of the abnormality and the code shown in FIG. 2 is an example, and a table in which the cause of the abnormality is classified in more detail may be used, or a different code may be used. Of course, as a code corresponding to only the copy prohibition, a simple configuration may be used in which the presence or absence of the copy prohibition is managed by 1-bit information.

As described above, the state of recording on the hard disk 63 is managed by the code. Next, the GOP (Group) performed by the microcomputer 56 based on the management information.
of Picture) information, management information including copy prohibition information, and the hard disk 6 of the generated information.
3 is described.

The microcomputer 56 controls the operation of the hard disk 63 (not shown) and the video signal recording / reproducing device 40.
The overall operation control of each signal system and each circuit unit constituting the above is performed.

For example, in the MPEG-2 encoder 54, in addition to generating a video / audio signal encoded by the MPEG-2 method into a signal in a bit stream format, an information signal relating to a GOP which is a unit of the encoding is generated. The generated information signal is supplied to the microcomputer 56.

The information signal related to the GOP includes detailed information such as the number of bytes of the entire GOP, the number of frames forming the GOP, the number of bytes of each frame, and the presentation time stamp. Temporarily stores such detailed information as management information for managing the operation of the apparatus.

In the temporarily stored management information, for example, when the special reproduction mode is designated by an external operation and the special reproduction is performed, the encoded I (Intra) frame is reproduced from the hard disk 63 and decoded. Reproduction control such as the reproduction control of the hard disk 63 for efficiently reproducing and obtaining the image information of the frame, the timing of temporarily storing the reproduced signal in the buffer memory, and the operation control of the decoding process of the MPEG-2 decoder. Used for

As described above, the microcomputer 56 controls the recording and the reproduction of the hard disk 63, and also manages at which address on the hard disk medium the information to be recorded is recorded.

Accordingly, the position of the GOP signal obtained by encoding by the MPEG-2 encoder 54 is recorded on the hard disk 63 by the microcomputer 56, and the GOP recording position information indicating the recording position of the GOP is converted by the microcomputer. 56.

The microcomputer 56 converts the GOP signals obtained by encoding the video signals into the above-mentioned GOP signals.
GOP information is generated based on the detailed information of the OP.
GOP including the above-mentioned abnormal input signal information in OP information
G of the management information
The OP information is temporarily stored in the temporary storage memory 57.

The GOP information temporarily stored in this way is recorded on the hard disk 63. The recording area of the hard disk 63 includes a stream recording area for recording a bit stream signal and recording position management information such as GOP information. It is divided into a management information recording area for recording.

In the management information recording area, while the GOP signal constituting the encoded bit stream is recorded in the stream recording area, the management information for managing the recorded GOP has a predetermined time interval. The GOP information is read from the temporary storage memory 57, and the read GOP information is sequentially recorded in the management information recording area.

There is also a method of recording the management information such as GOP information recorded in this manner on the same recording medium as the video / audio bit stream at the end of the recording of the bit stream. The video / audio bit stream and its management information are recorded on different recording media such that the management information is recorded and stored in a semiconductor memory such as the temporary storage memory 57 in the recording / reproducing apparatus. May be.

Next, the hard disk 63 is
The reproduction operation of reproducing the hard disk 63 of the video signal recording / reproducing apparatus 40 in which the management information including the copy prohibition is recorded will be described.

The video / audio bit stream recorded on the hard disk 63 is controlled by a microcomputer 56 by a hard disk recording / reproduction control circuit (not shown) to reproduce the hard disk 63, and a signal obtained by the reproduction is supplied to the hard disk recording / reproducing device 61. Here, amplification of a reproduction signal, demodulation of a signal modulated and recorded by digital modulation, and detection and correction of an error signal caused by a defect on a recording medium are performed.

The reproduced signal obtained by performing the signal processing in this manner is supplied to the buffer memory 71 and temporarily stored therein, and the temporarily stored signal is read out at a predetermined time interval and read out from the MPEG-2. The data is supplied to the decoder 72.

In the MPEG-2 decoder 72, the MP
Based on the signal format of the bit stream generated by the EG-2 encoder 54, the encoded video signal and audio signal are separated from the supplied bit stream signal, and the obtained video signal and audio signal are obtained. The signal is MP
The digital video signal and the digital audio signal are obtained by decoding according to the EG-2 system.

The digital video signal obtained in this manner is supplied to a D / A converter 73, where it is converted into an analog video signal, and the converted analog video signal is supplied to an OSD 74. The OSD 74 supplies a video signal on which an OSD signal is superimposed or a video signal on which an OSD signal is superimposed or a video signal output from the OSD 74 as a video signal output.

The video signal output supplied in this way is supplied to the monitor TV 90 to display the video signal, and an audio signal (not shown) is supplied from the decoder unit 70 to the monitor TV 90 as an audio output signal, and supplied. The audio signal is output from a speaker (not shown) of the monitor TV 90.

The signal format of the video signal output and the audio signal output supplied from the video signal recording / reproducing device 40 is not limited to the method of outputting an analog signal in this manner, and the high efficiency code obtained by reproducing the hard disk 63 is used. The decoded bit stream signal is decoded without decoding, for example, IEEE 1394 (Institute of Electrical and Elec
tronics Engineers 1394) may be supplied as an output signal as a digital signal as it is.

When the digital signal is supplied as it is, since information by the OSD 74 is not added to the signal, information to be added such as copy inhibition is added as, for example, additional information used in data broadcasting. There is a method in which the bit stream information is supplied by being added to the bit stream. Alternatively, the bit stream information obtained by reproduction is decoded, and a signal generated by the OSD 74 is superimposed.
There is also a method of encoding according to the EG-2 method and supplying it as an output signal.

In this manner, the corresponding signals are recorded and read in the management information recording area and the stream recording area of the hard disk 63, respectively.
Since random access reproduction is possible by moving the reproduction position at high speed, recording of a series of bit streams is not always recorded in a continuous area, and is generally divided into distant areas and recorded. Many.

To reproduce a bit stream divided and recorded for each area, it is necessary to read out a coded and generated video / audio bit stream in the recording order, and read out the bit stream in the recorded order. Therefore, management information such as GOP information is recorded in a management information recording area, and the reproduction is performed by reading the management information recorded in the recording area so that the location where a continuous GOP signal is recorded can be known. I have.

Therefore, when reproducing the hard disk 63, first, the management information is reproduced to obtain information on the GOP recording order such as GOP information, and the obtained information is supplied to the microcomputer 56, which is not shown. The hard disk control circuit generates an information signal related to a reproduction order of an area to be reproduced on the hard disk 63, and the generated information signal is supplied to a hard disk control circuit (not shown).
The hard disk 63 performs a reproducing operation according to the control command supplied in such a manner.

Thus, the bit stream signal recorded on the hard disk 63 can be reproduced as a video / audio bit stream in a desired order. The recording and reproducing operations of the bit stream signal can be performed at the same time, and the hard disk recording and reproducing circuit 61 determines the transfer rate of the signal supplied from the buffer memory 55 and the transfer rate of each signal supplied to the buffer memory 71. By setting the speed of the signal to be twice or more, the recording signal and the reproduction signal can be written and read at a high speed in a time-division manner, so that recording and reproduction can be performed substantially simultaneously.

In this way, recording and reproduction at distant positions on the disk can be performed at the same time, so-called follow-up reproduction (recording the program currently being recorded and simultaneously reproducing the previously recorded parts simultaneously), cache Recording / reproducing (video / audio information is sequentially recorded in a bit stream recording area for a predetermined time, and when the information is recorded to the end of the area, the oldest recording in the area is overwritten with new information. In this way, video and audio information for a predetermined time can be played back in the past).

Thereafter, when recording and reproduction such as follow-up reproduction and cache recording / reproduction are performed simultaneously, the management information of the place to be reproduced is not yet recorded in the hard disk 63 but is stored in the temporary storage memory 57. There is also.

The management information is stored in the hard disk 6
When the hard disk 63 is not transferred to the storage device 3, the management information of the GOP stored in the temporary storage memory 57 is read out, and the microcomputer 56 controls the reproduction of this device based on the read out information.

The copy information storage means in the case of performing such recording and reproduction at the same time as the hard disk 6
3 and the temporary storage memory 57, the user is notified of the copy prohibition information during reproduction by generating display information based on the copy prohibition information recorded on any of these storage media. It can be an output signal to be supplied to the monitor TV 90.

Further, the capacity of the video / audio bit stream recorded on the recording medium is limited as in the case of cache reproduction, so that the bit stream recorded on the hard disk 63 is substantially reproduced immediately after recording. When the purpose is simultaneous reproduction and storage is not performed, the management information is stored only in the temporary storage memory 57 and the hard disk 63
May not be recorded.

Here, recording and reproduction in the case where the point to be reproduced is not the object of preservation and the point to be reproduced is the nearest point to the recording point is regarded as recording / reproduction performed in real time.
The operation state of the recording and reproduction performed in this manner is called a live state.

The recording and reproducing operations in the live state are as follows.
The processing procedure is the same as the operation of reproducing the past part while recording, but the processing procedure is the same, but the operation and the procedure of the signal processing method are the same in the live state and the reproduction of the signal recorded in the past. Thus, it is possible to perform an operation of continuously playing back from the live state to a past time and a fast-forwarding of the reproduction speed from the follow-up reproduction, and to continuously operate visually to the live state.

As a method of continuously changing the state between the live state and previously recorded images while changing the state, the MPEG-2 encoding, decoding, and recording / reproducing processing on the hard disk are performed on the live state video. However, in such a case, a delay time occurs as a processing time in encoding, decoding, and recording / reproducing to / from the hard disk by MPEG-2.

For this reason, a temporal discontinuity occurs particularly when switching signals when performing playback from the real-time viewing state to the past, and the image is displayed for a moment such that the picture is disturbed or the picture is skipped. Therefore, it is not possible to display an image due to the smooth connection to the user, which gives the user an unnatural feeling.

In such a reproduction method in which the live state and the past video can be reproduced while being smoothly varied, and the live state is regarded as real-time, when the input signal supplied to the video input terminal 51 is prohibited from being copied. Means that the video signal supplied from the MPEG-2 encoder 54 is supplied as a signal such as black or a constant color in the reproduction of the past recorded video and in the video in the live state.

When the image to be displayed is entirely black or a fixed color, the reason is informed to the user to inform the user of the reason.
The message is superimposed and supplied by the SD 74, and the content of the message is displayed on the monitor TV 90.

At this time, it is preferable that the contents of the displayed message be different between the reproduction of the past recorded video and the reproduction of the live state. The information of the display screen supplied from the OSD 74 is stored in the OSD memory 58. Of the accumulated display screens, the most suitable display screen information is read by the microcomputer 56 and supplied to the OSD 74.

FIG. 3 shows an area diagram for storing display contents stored in the OSD memory 58. In the figure, the OSD memory 58 has an area for storing the display contents for the copy prohibition notification for storing the display contents for the live state and the display contents for other than the live state, and an area for storing the display contents for the rating notification. And a storage area for storing display contents for non-corresponding signal notification.

The display contents recorded in such an area are
In order to supply a signal to the SD 74 and generate a signal for display, the microcomputer 56 specifies a memory address of an area for storing the corresponding display content according to each case, and displays the display content stored in that area. To read out the image data related to.

FIG. 4 shows the contents of the image data stored in the OSD memory 58. In the figure, (a) and (c) shown on the left relate to recording, and (b) and (d) shown on the right relate to display.

(A) is a display example when a past recorded image is reproduced with respect to a recorded image when a signal for which copying is prohibited is recorded, and (b) is a display example in which a signal indicating that copying is prohibited is displayed. It is an example of a display in a live state at the time of being supplied to an apparatus.

When the user recognizes that he or she is looking at a past recorded image, the expression "recording could not be performed" shown in (a) is preferable, and in a live state, the device is very short. Even if it is time recording, since it is playing back what was once recorded on the hard disk, it is not to the user that the video is recorded, but it is currently being broadcast or being played back from another recording medium In order to see the display contents with the recognition of "re-recording", the expression "recording" is not preferable, and the expression "cannot be displayed" as in (b) is more preferable.

As another example that cannot be displayed, the signal format of the supplied video signal may be different from the signal format that can be decoded. (C) and (d) shown in FIG. 4 described above are examples of this, and the NTSC (national television system committ)
ee color television system), a video signal by HDTV (High Definition TV) was supplied to a device that can only display and record the signal.
This is a display example when the PEG-2 encoder 54 outputs, instead, a digital video signal of standard definition of a picture such as black or a fixed color.

[0097] The display example shown in (c) is a display image in a state other than the live state, and (d) is an image in the live state. These images are also expressions that do not give the user a sense of discomfort, as in the above-described cases (a) and (b).

In this expression, if the device for recording the signal is exclusively for the NTSC system broadcast in Japan or the United States and cannot decode a signal such as the PAL system which is a European standard system, (c) and "HD signal" in the display of (d) is displayed as "European TV signal".

The signal format is detected by the copy control detector 52 shown in FIG. 1 for detecting the horizontal synchronizing signal frequency of the video signal and identifying the format of the multiplexed color signal. The information is displayed based on the identified result.

Such display is a case where the signal format of the supplied input signal is identified even if the signal format cannot be decoded and recorded. For example, as shown in the table shown in FIG. 2 above, a specific type of cause related to a case where the signal system does not correspond is assigned by a code that classifies the cause, and the display screen of the display content according to the assigned code is assigned to the microcomputer. It is designated by 56 and displayed.

The detection of the abnormal input signal is performed when the level of the video signal supplied to the copy control detector is extremely small, or when the video signal is multiplexed with a so-called hum signal from a commercial power supply. Video signal input terminal 51
And a function of detecting that a video signal is not normally supplied.

The supplied signal is the copy detector 5
If the signal cannot be detected by the signal No. 2 and does not satisfy the criteria for a recordable signal, the supplied signal may be displayed as an "unsupported signal (method unknown)".

The above description has been made on the signal supplied to the apparatus without performing the recording operation depending on the supplied signal, the recording / reproducing method of the video signal indicating the operation state of the recording / reproducing apparatus, and the video signal recording / reproducing apparatus. However, the video signal recording device 40 is divided into an encoder unit 50 and a recording / reproducing unit 60.
There is a method of configuring the video signal recording device configured as described above, and configuring the decoder unit 70 as a video signal reproduction device.

The video signal recording device and the video signal reproducing device are installed at different places, and the devices installed at remote places are operated by being connected to each other by a home network or the like.

At this time, the video signal recording device 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 can be installed as multiple 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 are connected to a hard disk while performing two-way communication. The video signal information to be recorded is supplied by an operation command from each room to a monitor TV for viewing a target bit stream via a set-top box operated by a user, and a decoded video signal is displayed. To be.

As described above, when a recording device and a decoder unit as a transmitting terminal and a receiving terminal are installed at remote locations and are operated by being connected by communication means, a plurality of transmitting terminals and a plurality of receiving terminals are connected to a network. Can be combined to operate a network type video system.

Further, the recording medium used in the recording / reproducing unit has been described mainly on the hard disk. However, the recording medium is a medium which can be accessed at a high speed, for example, a magneto-optical disk, RA
The present invention can be applied to an apparatus using another recording medium such as an M type or RW type DVD, and a semiconductor memory type recording medium.

As described above, the video signal encoding method 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, MP
EG-7 system, MPEG-, whose standardization is about to begin
For example, a method using a fractal compression method may be used.

In the case of the MPEG-2 system, since the encoding parameter of the image signal is managed together with the GOP management information, the copy operation is managed by inserting a copy prohibition signal into the GOP management information. If the encoding method is different, the encoding parameter management method is also different. For the copy prohibition code and the like, the insertion point is set according to the management information of the signal to be encoded to realize the above-described function.

In such a case, if the copy permission information flag is managed using the same image unit as the unit of the encoding parameter to be handled, the copy permission information flag can be checked with a small number of accesses. This has the same effect as described above.

[0112]

According to the first aspect of the present invention, the procedure is the same as the recording / reproducing process for reproducing a video signal portion recorded in the past while recording. In the method of recording and reproducing a video signal to obtain a signal, for example, a signal for which copy prohibition is designated,
When a signal for which the display permission level is set or a video signal that cannot be recorded due to technical restrictions is supplied, the video signal is replaced with an image such as black or a fixed color and recorded. The playback of the recorded signal will display a message based on the cause of the failure to record, so for the recordable video signal, the signal from the signal immediately before recording to the signal recorded in the past will be swept smoothly. Since a reproduced video can be obtained, there is an effect that a recording / reproducing method of a video signal capable of realizing a cache recording / reproducing of a smooth operation and a chasing reproduction function can be provided.

According to the second aspect of the present invention, the monitoring output signals of the video signal obtained by reproducing the signal most recently recorded and the video signal obtained by reproducing the signal recorded earlier are different from each other. Because it is possible to display different messages to the user when viewing in the "live state" and when playing back information recorded in the past, the live state image can be displayed to the user. Claim 2 eliminates discomfort to a message caused by thinking that the user is watching a current video instead of recording, and in addition to the effect of claim 1, even if the supplied video signal is a video signal for which recording is prohibited. There is an effect that it is possible to provide a video signal recording / reproducing method capable of notifying a user of appropriate information.

Further, according to the third aspect of the present invention, the video signal supplied with the information of copy prohibition added to the supplied video signal and the signal most recently recorded are compared with the currently supplied signal. In the case of performing live reproduction, the user can be correctly notified that the supplied signal is a copy prohibition signal. There is an effect that it is possible to provide a video signal recording / reproducing method capable of notifying the user of an appropriate sample listening method.

According to the fourth aspect of the present invention, a video signal which has the same configuration as the recording / reproducing process of reproducing a past portion while recording and obtains a signal in a live state by regarding a recorded latest signal as real time For example, when a signal for which copying is prohibited, a signal for which a display permission level is set, or a video signal that cannot be recorded due to technical restrictions is supplied, the video signal It replaces the image with color and records it, and displays the message based on the cause of the failure to record the playback of the recorded signal. From the past to the signal recorded in the past, it is possible to obtain a smooth playback video while sweeping, Only an effect capable of providing a recording and reproducing apparatus of a video signal that can realize the functions of the playback.

Further, according to the fifth aspect of the present invention, the supplied video signal is accompanied by information indicating that copying is prohibited, so that live reproduction in which a signal most recently recorded is displayed as a currently supplied signal is performed. In this case, the user can be correctly informed that the supplied signal is a signal supplied with the copy prohibition information attached thereto. There is an effect that it is possible to provide a video signal recording / reproducing apparatus capable of appropriately notifying a user of a method or the like.

According to the sixth aspect of the present invention, a signal in a live state is obtained by regarding the most recent recorded signal as real time with the same configuration as the recording / reproducing processing for reproducing a past portion while recording. In a video signal recording / reproducing device, when the signal format of a video signal supplied as an input signal is different, or when the signal quality is not displayed or does not satisfy a predetermined standard for recording, the video signal is completely black or Recording is performed by replacing the image with an image of a fixed color or the like, and the display of the video signal supplied to the input terminal and the reproduction of the recorded signal are displayed as a message based on the cause of the failure to record. For a possible video signal, a smooth playback video can be obtained while sweeping from the signal most recently recorded to the signal recorded in the past. There is an effect that it is possible to provide a recording and reproducing apparatus of a video signal cache recording and reproducing of over's operation, and the function of chasing playback can be realized.

[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 table showing a relationship between a cause of an abnormality of a supplied video signal and a corresponding identification code according to the embodiment of the present invention.

FIG. 3 is an area diagram for storing display contents stored in an OSD memory 58 according to the embodiment of the present invention.

FIG. 4 is a diagram showing contents of image data stored in an OSD memory 58 according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 40 video signal recording / reproducing device 50 encoder unit 51 video signal input terminal 52 copy control signal detector 53 A / D converter 54 MPEG-2 encoder 55 buffer memory 56 microcomputer 57 temporary storage memory 58 OSD memory 60 recording / reproducing unit 61 hard disk Recording / reproducing device 63 Hard disk 70 Decoder unit 71 Buffer memory 72 MPEG-2 decoder 73 D / A converter 74 OSD 90 Monitor TV

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C053 FA06 FA13 FA17 FA23 GB06 GB08 GB11 GB15 GB38 HA18 HA21 HA40 JA12 JA21 JA30 KA01 KA24 LA06 LA15 5D044 AB05 AB07 BC01 CC05 DE28 DE50 EF03 EF05 GK12 HH13 HL08 HL12

Claims (6)

[Claims] A video signal accompanied by a signal indicating a recording permission level of program software is supplied. When the supplied video signal conforms to the permission level, the video signal is recorded on a recording medium, A video signal recording / reproducing method for supplying as a video signal output for monitoring a video signal obtained by reproducing a signal immediately before the recording of the recorded signal or a signal recorded before the signal, Based on the recording permission level of the supplied video signal,
First to determine whether or not the signal is permitted to be recorded
And if the first step determines that the recording is not permitted, a second step of replacing the supplied video signal with a predetermined signal, and a second step of replacing the supplied video signal by the second step And a third step of recording a signal including information indicating that the supplied video signal cannot be supplied as the video output for monitoring while recording the recorded signal on the recording medium. Characteristic video signal recording and playback method. 2. A signal containing information indicating that the supplied video signal cannot be supplied in the third step, wherein the signal containing information indicating that the supplied video signal cannot be supplied and the video signal obtained by reproducing the signal most recently recorded are recorded before the predetermined time. 2. The video signal recording / reproducing method according to claim 1, wherein the video signal obtained by reproducing the signal is a signal of information which makes the monitoring output signal different in the case. 3. The video signal recording / reproducing method according to claim 1, wherein the recording permission level in the first step is a level relating to copy prohibition. 4. A video signal accompanied by a signal indicating a recording permission level of program software is supplied. When the supplied video signal conforms to the permission level, the signal is recorded on a recording medium, and A video signal recording / reproducing device configured to supply as a video signal output for monitoring a most recent signal at the time of recording of the recorded signal, or a video signal obtained by reproducing a signal recorded before that, Based on the recording permission level of the supplied video signal,
Recording determining means for determining whether or not the signal is a signal for which recording is permitted; and when the recording determining means determines that the recording is not permitted, a video signal to be recorded on the recording medium is converted to a predetermined signal. A signal replacement unit that replaces the signal with a signal; and a message addition unit that supplies, as the video output for monitoring, a message signal indicating that the supplied video signal cannot be supplied. Video signal recording and reproducing device. 5. A monitoring output signal differs between a video signal obtained by reproducing a signal immediately before recording and a video signal obtained by reproducing a signal recorded before the message signal. 5. The video signal recording / reproducing apparatus according to claim 4, wherein the signal is an information signal. 6. A video signal based on a plurality of signal standards is supplied. When the supplied video signal is a signal based on a recordable standard, the signal is supplied. A video signal based on a recordable standard is recorded on a recording medium, and a video signal immediately after recording,
Or, in a video signal recording / reproducing apparatus which supplies a video signal obtained by reproducing a signal recorded before that as a video signal output for monitoring, the supplied video signal is set to a recordable standard. Recording determination means for determining whether or not the signal is based on, and signal replacement means for, when the recording determination means determines that the recording is not, replacing a video signal to be recorded on the recording medium with a recordable signal And a message signal adding unit for supplying a message signal indicating that the supplied video signal is not a signal based on a display or recordable standard as the video output for monitoring. A video signal recording and reproducing apparatus.