JPH10215436A - Recording and reproducing device, its method and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record information representing a detected change by detecting a change in the recorded video and audio data for an idle time when recording and reproduction of video and audio data are not conducted. SOLUTION: Video and audio data reproduced from a recording medium 5 are to a reproduction data processing system 31, in which the data are separated into video data, audio data and additional information, the video data are expanded in a video signal band expansion processing system 32, a change in the video data is detected by a video signal detection control system 38, from which the corresponding additional information is outputted. Furthermore, the audio data are expanded by an audio signal band expansion processing system 41, a change in the audio data is detected by an audio signal detection control system 42, from which the corresponding additional information is outputted. The additional information is fed to a recording system, where the information is recorded on the recording medium 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus and method, and a recording medium, for example, detecting a change in video information or audio information, and using the information to convert the video information or audio information according to the purpose. The present invention relates to a recording / reproducing apparatus and method capable of recording / reproducing efficiently, and a recording medium.

[0002]

2. Description of the Related Art Conventionally, a video system for surveillance records, for example, video and audio input from a surveillance camera on a video tape, and then reproduces the video and audio to check the contents. Also, when recording video and audio, it detects changes in the video, records it in relation to the video and audio, and then searches the video and audio when the video change was detected when checking the content. It has been proposed to be able to.

A VT for recording and reproducing a normal broadcast program
In R (video tape recorder), a scene change (scene change) is detected and a commercial (C
M) is detected to prevent the CM from being reproduced or recorded. Furthermore, in recent years, it has been considered that a video is compressed and recorded on a recording medium such as an optical disk, a hard disk, or a memory card that can be randomly accessed.

[0004]

However, the video system for surveillance is a video system for recording and reproducing a normal broadcast program.
There is a problem that the system has an independent system because it has characteristics different from those of the TR and has a different operation form.

The present invention has been made in view of such a situation, and has a function of recording and reproducing an ordinary broadcast program, and a function of searching for a broadcast program, and a monitoring function. The search can be performed more efficiently.

[0006]

According to a first aspect of the present invention, there is provided a recording / reproducing apparatus for inputting one or a plurality of signals;
First recording means for recording the signal input by the input means on a predetermined recording medium, reproducing means for reproducing the signal recorded on the recording medium by the first recording means, and reproduction of the signal reproduced by the reproducing means. Detecting means for detecting a change;
A second recording unit for recording information indicating the signal change on the recording medium in association with the signal when the detection unit detects a change in the signal, wherein the first recording unit records the signal on the recording medium; Independently of the recording, the reproducing means reproduces the signal recorded on the recording medium, the detecting means detects a change in the signal reproduced by the reproducing means, and the second recording means reproduces the signal by the detecting means. When the change is detected, information indicating the change in the signal is recorded on the recording medium in association with the signal.

According to a seventh aspect of the present invention, a signal recorded on a recording medium is reproduced independently of recording of one or a plurality of input signals on the recording medium, and the reproduced signal is reproduced. A change is detected, and when a change in the signal is detected, information indicating the change in the signal is recorded on a recording medium in association with the signal.

According to another aspect of the present invention, there is provided a recording / reproducing apparatus for inputting one or a plurality of signals, detecting means for detecting a change in the signal input by the input means, and an image forming a signal by the detecting means. When a change in the signal is detected, the video recording means for recording the video signal on a predetermined recording medium, and the level of the audio signal constituting the signal is greater than or equal to a predetermined reference value, and the audio signal is And sound recording means for recording sound on a recording medium when it changes within the reference time.

According to a ninth aspect of the present invention, there is provided a recording / reproducing method wherein one or a plurality of signals are input, a change in the input signal is detected, and a change in a video signal constituting the signal is detected.
The video signal is recorded on a predetermined recording medium, and when the level of the audio signal constituting the signal is equal to or higher than a predetermined reference value and the audio signal changes within a predetermined reference time, the audio is recorded on the recording medium. It is characterized by recording.

A recording medium according to a tenth aspect records at least video data, audio data, information indicating a change in video data, and information indicating a change in audio data.
The information indicating the change in the video data and the information indicating the change in the audio data are recorded in association with the video data and the audio data.

In the recording / reproducing apparatus according to the first aspect, the input means inputs one or a plurality of signals, and the first recording means records the signal input by the input means on a predetermined recording medium. The reproducing means reproduces the signal recorded on the recording medium by the first recording means, the detecting means detects a change in the signal reproduced by the reproducing means, and the second recording means reproduces the signal by the detecting means. When the information indicating the change of the signal is recorded on the recording medium in association with the signal when the change of the signal is detected, independently of the recording of the signal on the recording medium by the first recording means, the reproducing means includes: The signal recorded on the recording medium is reproduced, the detecting means detects a change in the signal reproduced by the reproducing means, and the second recording means detects a change in the signal when the signal change is detected by the detecting means. Information that indicates In association response is recorded on the recording medium.

In the recording / reproducing method according to the present invention, a signal recorded on a recording medium is reproduced independently of recording of one or a plurality of input signals on the recording medium, and the reproduced signal is reproduced. Is detected, and when a signal change is detected, information indicating the signal change is recorded on the recording medium in association with the signal.

In the recording / reproducing apparatus according to the present invention, the input means inputs one or a plurality of signals, the detection means detects a change in the signal input by the input means, and the video recording means comprises: When a change in the video signal constituting the signal is detected by the detection means, the video signal is recorded on a predetermined recording medium, and the audio recording means determines that the level of the audio signal constituting the signal is higher than a predetermined reference value by the detection means. And when the audio signal is changing within a predetermined reference time, the audio is recorded on the recording medium.

In the recording / reproducing method according to the ninth aspect, one or more signals are input, a change in the input signal is detected, and when a change in a video signal constituting the signal is detected, the video signal is output. Is recorded on a predetermined recording medium, and when the level of the audio signal constituting the signal is equal to or higher than a predetermined reference value, and the audio signal changes within a predetermined reference time,
The sound is recorded on a recording medium.

In a recording medium according to a tenth aspect,
At least video data, audio data, information indicating a change in the video data, and information indicating a change in the audio data are recorded, and the information indicating the change in the video data and the information indicating the change in the audio data are video data and It is recorded in association with audio data.

[0016]

FIG. 1 is a block diagram showing a configuration example of an embodiment of a video / audio recording / reproducing apparatus to which a recording / reproducing apparatus of the present invention is applied. The recording signal processing system 1 converts input video and audio signals into digital video and audio data, respectively, and performs compression processing. The signal detection system 2 detects a change in the video data and outputs information indicating the change. The recording signal processing system 1 records information output from the signal detection system 2 as additional information (ID) on the recording medium 5 (reproducing means) in association with the changed video data.

The reproduction signal processing system 3 divides the reproduced data into video data, audio data, and additional information. Then, the video data and the audio data are subjected to a decompression process and are converted into analog signals. The signal detection system 4 detects a change in the video data and outputs information indicating the change. Further, the reproduction signal processing system 3 records the information output from the signal detection system 4 on the recording medium 5 as additional information in association with the changed video data.

The recording medium 5 includes a hard disk, an optical disk, a memory card, and the like, and records a signal supplied from the recording signal processing system 1 under the control of a system controller 7 described later. Further, the recorded data is reproduced and supplied to the reproduction signal processing system 3.

The recording control signal input system 6 is constituted by a keyboard or the like, and supplies a recording control signal corresponding to a key operation input by a user to the system controller 7. The reproduction control signal input system 8 includes a keyboard, a mouse, and the like, and supplies a reproduction control signal corresponding to a key operation input by a user to the system controller 7. The system controller 7
ROM (read only me) for storing a predetermined control program
mory), a CPU that executes processing according to a control program
(Central processing unit) and the like, and controls each section according to control signals input from the recording control signal input system 6 and the reproduction control signal input system 8.

A recording signal processing system 1, a signal detection system 2, a recording medium 5, a recording control signal input system 6, a reproduction control signal input system 8,
And a system controller 7 constitute a recording system, and a reproduction signal processing system 3, a signal detection system 4, a recording medium 5, a recording control signal input system 6, a reproduction control signal input system 8, and a system controller 7 constitute a reproduction system. Make up.

FIG. 2 is a block diagram showing a configuration example of the recording system shown in FIG. Video signal processing system 11 (input means)
Is configured to return a video signal input from a VTR or the like to a baseband signal and output the signal. The camera signal processing system 12 (input means) converts a video signal input from a video camera or the like into a baseband signal and outputs the baseband signal. The tuner system 13 (input means) converts a video signal and an audio signal input via an antenna back to a baseband signal and outputs the baseband signal.

The video signal switching system 14 switches the signals supplied from the video signal processing system 11, the camera signal processing system 12, and the tuner system 13 as needed under the control of the system controller 7. The video signal A / D conversion system 15 converts the video signal input from the video signal switching system 14 into digital video data. The video signal detection control system 16 (detection means) detects a change in the video data and outputs additional information (ID) including information indicating the change. The video signal band compression processing system 17 applies MPEG (Moving Picture Experts Group) to the input video data.
p) and the like, and then output.

The audio signal processing system 18 (input means)
The level and the like of the audio signal input from R or the like are adjusted and output. Microphone input audio processing system 19
The (input means) adjusts the level of an audio signal input from a microphone of a video camera or the like, and outputs the adjusted signal. The audio signal switching system 20 switches the audio signals supplied from the tuner system 13, the audio signal processing system 18, and the microphone input audio processing system 19 as needed under the control of the system controller 7.

The audio signal A / D conversion system 21 converts an input audio signal into digital audio data and outputs the digital audio data. The audio signal detection control system 22 (detection means) detects a change in the input audio data and outputs the corresponding additional information. The audio signal band compression processing system 23 compresses the input audio data,
The output has been made.

The recording data processing system 24 (first recording means,
The second recording unit, the video recording unit, and the audio recording unit) are: video data from the video signal band compression processing system 17, audio data from the audio signal band compression processing system 23, video signal detection control system 16, and audio signal detection. The additional information supplied from the control system 22 is superimposed and output.

Next, a description will be given of an operation in which a change in video is simultaneously detected when the input video / audio signal is recorded, and is recorded as an ID having a format described later with reference to FIG.

A video signal from a VTR or the like input to the video signal processing system 11 is returned to a baseband signal such as YUV and then supplied to a video signal switching system 14. Also,
The video signal supplied to the camera signal processing system 12 is YUV
After being returned to the baseband signal, the video signal is supplied to the video signal switching system 14. In addition, tuner system 1
3 is returned to a baseband signal such as YUV after a signal of a predetermined broadcasting station is selected, a video signal is supplied to a video signal switching system 14, and an audio signal is converted to an audio signal switching system. 20.

The V signal input to the audio signal processing system 18
The audio signal from the TR or the like is supplied to the audio signal switching system 20 after the level and the like are adjusted. The audio signal input from the microphone of the video camera or the like is supplied to the audio signal switching system 20 after the level and the like are adjusted by the microphone input audio processing system 19.

The video signal processing system 11, the camera signal processing system 12, and the tuner system 1 supplied to the video signal switching system 14.
3 is switched and output under the control of the system controller 7. The video signal output from the video signal switching system 14 is converted into digital video data in a video signal A / D conversion system 15 and then supplied to a video signal detection control system 16.

In the video signal detection control system 16, FIG.
, A change in video is detected based on a histogram, an inter-frame difference, a motion vector, and the like. Then, additional information indicating a change in the video is supplied to the recording data processing system 24. The video data is supplied to a video signal band compression processing system 17. The video data supplied to the video signal band compression processing system 17 is subjected to a compression process by a compression method such as MPEG, and then the recording data processing system 24.
Supplied to

On the other hand, the tuner system 13 and the audio signal processing system 1
8, and any one of the audio signals supplied from the microphone input audio processing system 19 to the audio signal switching system 20 is switched and output under the control of the system controller 7, and is supplied to the audio signal A / D conversion system 21. You. The audio signal supplied to the audio signal A / D conversion system 21 is converted to digital audio data and then supplied to the audio signal detection control system 22. In the audio signal detection control system 22, a change in the audio is detected, and additional information indicating the change in the audio is supplied to the recording data processing unit 24. The audio data is supplied to the audio signal band compression processing system 23. The audio data supplied to the audio signal band compression processing system 23 is M
After being subjected to a compression process by a compression method such as PEG, it is supplied to the recording data processing system 24.

The video data supplied from the video signal band compression processing system 17 supplied to the recording data processing system 24, the additional information from the video signal detection control system 16 and the audio signal detection control system 22, and the audio signal band compression processing system 23 After being superimposed, the audio data is supplied to the recording medium 5 and recorded in a predetermined recording format as described later with reference to FIG. The additional information is recorded in association with the video data and the audio data as an ID having a predetermined format including the additional information and a character code, as described later with reference to FIG.

As described above, a change in the input video signal and audio signal is detected, and an ID (additional information) including information indicating the change is recorded in association with the video signal and the audio signal.

FIG. 3 is a block diagram showing a configuration example of a reproduction system of the video / audio recording / reproduction apparatus of FIG. The reproduction data processing system 31 divides the data reproduced from the recording medium 5 into video data, audio data, and additional information. The video signal band expansion processing system 32 performs expansion processing on the video signal compressed by MPEG or the like. Video signal detection control system 38 (detection means)
Is configured to detect a change in video data and output additional information including information indicating the change. Video signal D
The / A conversion system 39 converts the input video data into an analog video signal. The video signal output processing system 40 encodes and outputs an input video signal.

The audio signal band expansion processing system 41 uses MPEG
For example, the audio data that has been subjected to compression processing is expanded. The audio signal detection control system 42 (detection means) detects a change in the input audio data, outputs the change, and supplies the audio data to the audio signal D / A conversion system 43. The audio signal D / A conversion system 43
The input audio data is converted into an analog audio signal. The audio signal output processing system 44 encodes and outputs an input audio signal.

The additional function processing system 45 (providing means, display control means) includes the ID supplied from the reproduction data processing system 31,
That is, based on the information indicating that the video or audio has changed, and the video data and audio data, the changed video is searched, a video signal corresponding to the search screen is created, and the video signal is supplied to the video signal output processing system 40. Video data, audio data, and ID are transferred to the outside via a telephone line or a network.

FIG. 4 is a block diagram showing a configuration example of the video signal detection control systems 16 and 38 shown in FIGS. The histogram difference detection block 51 creates a pixel-level histogram of each pixel constituting each screen for each color component of the input video data, calculates a difference from the histogram of the immediately preceding screen, and calculates a calculation result. Is output.

The inter-frame difference detection block 52 is constituted by a frame memory or the like for storing video data, calculates a difference between the input video data and the video data delayed by one frame, and further accumulates the difference amount. , And
The calculation result is output.

The motion vector detection block 53 obtains a representative point of a predetermined frame and a representative point of the immediately preceding frame.
According to a so-called representative point matching method, a motion vector between frames is detected from a difference in the position of the representative point of each frame, and the detected motion vector is output.

The detection determining section 54 sets predetermined threshold values for the detection results supplied from the histogram detection block 51, the inter-frame difference detection block 52, and the motion vector detection block 53, respectively. When a detection result exceeding the threshold value is obtained, it is determined that the input video data has changed, and an ID including information indicating the change and the detection result is generated and supplied to the additional function processing system 45. I have.

FIG. 5 is a block diagram showing a configuration example of the audio signal detection control systems 22, 42 shown in FIGS. The level change detection block 61 detects the input audio data, detects the level, compares the levels at intervals of each frame, and when a difference occurs, determines that the audio level has changed and indicates the change. The information is included in the ID and output.

L (left) -R (right) phase difference detection block 6
2 is L when the input audio data is stereo
When there is a difference in volume between the Rs or when the phase relationship changes, it is determined that the audio data has changed, and data indicating this is included in the ID and output.
The difference in volume between the LRs (ΔS) can be obtained, for example, by the following equation.

ΔS = (L ₁ −R ₁ ) − (L ₂ −R ₂ )

In the above equation, L ₁ and R ₁ represent the left (L) and right (R) sound volumes of the audio data in the currently input frame, respectively, and L ₂ and R ₂ represent the previous frame. The left and right volumes of the audio data in the frame are respectively shown.

The spectrum difference detection block 63 performs an FFT operation on the input audio data in each frame to detect a spectrum. When a difference occurs in the audio spectrum of each frame, it is determined that the audio data has changed, and an ID including information indicating the change is output.

FIG. 6 shows the additional function processing system 45 shown in FIG.
FIG. 3 is a block diagram illustrating a configuration example of FIG. ID discrimination control unit 71
Is configured to input an ID from the reproduction data processing system 31. The recording medium interface 72 receives an ID, video data, audio data, and the like from the reproduction data processing system 31.

CPU (central processing unit) 73
Is ROM (read only memory) or RAM (random acc
Each unit is controlled in accordance with a control program stored in a storage unit 74 including an ess memory). Further, data corresponding to the search screen is supplied to the display control unit 75. The display control unit 75 stores data corresponding to the search screen supplied from the CPU 73 in the built-in frame memory, and stores the RG corresponding to the search screen stored in the frame memory.
A B signal, a YUV signal, and the like are output to the video signal output system 40.

The modem network control unit 76 has a CPU
Under the control of 73, the ID supplied from the ID determination control section 71 or the ID, video data, and audio data supplied from the recording medium interface 72 are transmitted to another host computer or the like via a telephone line or the like via a network. It has been made like that.

The input / output control unit 77 outputs video data, audio data, and ID to the outside via a serial bus, a parallel bus and the like.

Next, the video signal and the audio signal are recorded on the recording medium 5, and the video data and the audio data recorded on the recording medium 5 are recorded as background processing during the idle time when the recording medium 5 is not recorded or reproduced. An operation of detecting a change in data and recording information indicating the change in the recording medium 5 as an ID will be described.

The video data, audio data, and additional information reproduced from the recording medium 5 are supplied to a reproduction data processing system 31. The video / audio data and additional information supplied to the reproduction data processing system 31 are divided into video data, audio data, and additional information. The video data is supplied to the video signal band expansion processing system 32, and the audio data is supplied to the audio signal band expansion. It is supplied to the processing system 41. Further, the additional information is supplied to the additional function processing system 45.

The video data supplied to the video signal band expansion processing system 32 is expanded, converted to the original video data, and then supplied to the video signal detection control system 38. The video signal detection control system 38 detects a change in the expanded video data. That is, the histogram difference detection block 51
In, the difference in histogram between the frames is detected,
The detection result is supplied to the detection determination unit 54. Further, in the inter-frame difference detection block 52, a difference for each pixel of video data between frames is obtained, and the accumulation for all pixels is calculated. Then, the accumulation of the difference amount is supplied to the detection determination unit 54 as a detection result. At this time, instead of calculating the accumulation for the entire frame, one frame may be divided into a plurality of areas, and the accumulation of the difference amount may be calculated for each area to detect a change in a predetermined area. It is possible. Further, in the motion vector detection block 53, a motion vector between frames is detected, and the detection result is supplied to the detection determination unit 54.

In the detection judging section 54, a histogram detection block 51, an inter-frame difference detection block 52,
Then, based on the detection result supplied from the motion vector detection block 53, it is determined whether or not the input video signal has changed. For example, motion vector detection block 5
According to 3, when a motion vector is detected, it is determined that the subject has moved. Further, for example, when a change in the histogram is detected by the histogram detection block 51 and no motion vector is detected, it is determined that the brightness of the subject has changed.

The determination result is included in an ID (additional information) having a format as shown in FIG. 7, and is supplied to the additional function processing system 45. The video data is supplied to a video signal D / A conversion system 39.

The video data supplied to the video signal D / A conversion system 39 is converted into an analog video signal and then supplied to a video signal output processing system 40. Video signal output processing system 4
At 0, the input video signal is output after being encoded. The output video signal is displayed on a display (not shown) or the like.

On the other hand, in the additional function processing system 45, the additional information supplied from the reproduction data processing system 31 is supplied to the recording data processing system 24 of the recording system, and the additional information is supplied to the video data and audio data when a change is detected. Associated with the recording medium 5
To record. This makes it possible to search for the video and audio at the time when the video has changed, based on the additional information. That is, as described later, the additional information (ID) is recorded in units of frames, and a field for describing a video change detection result and a motion vector of a subject is provided. The detection result is described in those fields. Become. Therefore, by referring to the field in which the video change detection result and the motion vector of the subject are described,
The video and audio of the portion where the video data has changed can be searched.

The audio data supplied to the audio signal band expansion processing system 41 is subjected to expansion processing, converted into an original audio signal, and then supplied to the audio signal detection control system 42. In the audio signal detection control system 42, the level change detection block 61, the LR phase difference detection block 62 shown in FIG.
In the spectrum difference detection block 63, a change in audio data is detected.

As described above, for example, the level change detection block 61 detects the audio data, compares the levels of the audio data between frames, and supplies the comparison result to the detection determination unit 64. When a difference equal to or greater than the predetermined reference value occurs, the detection determination unit 64 determines that the audio data has changed. When the audio data is stereo, the left and right audio levels are compared in the LR phase difference detection block 62, and the comparison result is detected by the detection determination unit 64.
Supplied to When a level difference (volume difference) equal to or greater than a predetermined reference value is detected, the detection determination unit 64
It is determined that the audio data has changed. In a spectrum difference detection block 63, an FFT is performed on a sample of the audio data in each frame, an audio spectrum of each frame is detected, and a difference between the audio spectra of each frame is obtained. 64. When a difference equal to or greater than a predetermined reference value is detected in the audio spectrum of each frame, the detection determination unit 64
It is determined that the audio data has changed.

The result of the judgment by the detection judging unit 64 is supplied to the additional function processing system 45 as additional information as shown in FIG. In the additional function processing system 45, the additional information from the audio signal detection control system 42 is supplied to the recording data processing system 24 of the recording system, and is recorded on the recording medium 5 in association with the changed audio data. Thereby, based on the additional information,
It is possible to search for audio and video at the time when the audio has changed. That is, as described later, the additional information (I
D) is recorded in units of frames, and has a field for describing the sound change detection result, and the detection result is described in this field. Therefore, by referring to the field in which the sound change detection result is described,
It is possible to search for the audio and video of the portion where the audio data has changed.

The audio data supplied to the audio signal detection control system 42 is supplied to an audio signal D / A conversion system 43. The audio data supplied to the audio signal D / A conversion system 43 is converted into an analog audio signal, supplied to an audio signal output processing system 44, encoded, and output.

As described above, by utilizing the idle time during which the normal recording / reproducing processing for the recording medium 5 is not performed,
A change in video data and audio data recorded on the recording medium 5 is detected, and an ID (additional information) including information indicating that the video and audio have changed is replaced with the video data and audio data at the time when the change is detected. And can be recorded on the recording medium 5.

When recording a video / audio signal input from a monitoring video camera or the like on the recording medium 5, the additional information recorded on the recording medium 5 is referenced to detect a video change in the additional information. As a result, it is possible to search for a frame in which video and audio have not changed from data recorded in the subject motion vector and the audio change detection result, and record a new video and audio signal in that portion. Thus, only the video data and the audio data at the time when at least one of the video and the audio has changed can be left on the recording medium 5.

For example, in the case of video and audio captured by a monitoring video camera or the like, since the video or audio when the subject moves or the audio changes has an important meaning, the video or audio that does not change is reproduced. By erasing and recording new video and audio therein, the recording medium 5 can be used efficiently.

When recording a video signal and an audio signal, a change in the video signal and the audio signal is detected, and the video signal and the audio signal are recorded only when the video signal and the audio signal change. it can. In this case, the change in the video data and the audio data is detected by the video signal detection control system 16 and the audio signal detection control system 22 of the recording system shown in FIG. When this is done, the additional information indicating this is supplied to the additional function processing system 45, and the video data and audio data at that time are associated with the additional information and recorded on the recording medium 5.

As a result, it is possible to record only the video and audio at the time when the video and audio have changed, which is effective for recording video captured by a monitoring video camera or the like. Yes, the recording medium 5 can be used efficiently.

Also, when the video data recorded on the recording medium 5 is reproduced and displayed on a display (not shown), the recording system detects a change in the video signal input from the camera system, and When a change in the signal is detected, the display on the display can be forcibly switched to the video input from the camera system.

That is, the video signal from the camera system input from the camera signal processing system 12 is transmitted to the video signal switching system 14.
By switching the internal switch at
The video signal is selectively output and supplied to the video signal A / D conversion system 15. In the video signal A / D conversion system 15, the input video signal is converted into digital video data and supplied to the video signal detection control system 16. In the video signal detection control system 16, as described above with reference to FIG. 4, a change in the input video data is detected by the detection determination unit 54 for each frame, for example. Then, the detection result is supplied to the system controller 7. Thereby, the system controller 7 can recognize the change of the video data.

When the system controller 7 recognizes a change in the video signal based on the detection result from the video signal detection control system 16, the camera supplied to the video signal output processing system 40 via the video signal switching system 14. Command to encode and output the video signal input from the system. The video signal output processing system 40 encodes the video signal from the camera system supplied via the video signal switching system 14 according to a command from the system controller 7,
Display the corresponding video on the display.

Thus, even when the video data recorded on the recording medium 5 is being reproduced, when there is a change in the video signal input from the camera system, the video can be displayed on the display.

FIG. 7 is a diagram showing an example of the format of the ID. The following items are described in the ID. That is, the recording date / time / hour / minute / second (YEAR, MONTH,
DAY, HOUR, MINUTE, SECOND), input source (INPUT SOURCE) (for example, VT
R, tuner, video camera, etc.), channel number (C
HANNEL), ID category (ID CATEGOR)
Y) (for example, characters and motion information), a video change detection result,
A subject motion vector, a voice change detection result, and the like are described.

FIG. 8 shows a recording format when the ID shown in FIG. 7 is recorded. In FIG. 8A, 1
VIDEO data and AUDIO data for a frame are used as a unit of one block, and each block is stored in the recording medium 5.
Are recorded in a physically or logically continuous predetermined area. Then, the ID corresponding to each frame is recorded in a predetermined physically or logically continuous area different from the area where the frame is recorded. On the other hand, in FIG. 8B, VIDEO data, AUDIO data, and ID for one frame are set as one block unit, and each block is recorded in a predetermined area physically or logically continuous on the recording medium 5. Is done.

FIG. 9 is a diagram showing a display example of a search screen for searching for data when a change in video or audio is detected based on the ID recorded on the recording medium 5 and displaying the search result. . In this example, the time when the change is detected and the specific content of the change are displayed. That is,
In the case of this example, the period from time 10:00 to 10:03,
This indicates that a change in voice has been detected. In addition, a period from time 14:00 to 14:22 and time 02: 3
During the period from 4 to 02:38, the motion of the subject is detected. Times 03:22 to 03:25
During this period, a change in the brightness of the subject is detected.

Then, by selecting a predetermined item of the detection result displayed on the search screen by using, for example, a mouse or the like constituting the reproduction control signal input system 8, video data and audio data corresponding to the selected item are selected. The data can be played back and displayed on the screen of the display. That is, the system controller 7 determines which item of the search screen displayed on the display has been selected based on the operation of the reproduction control signal input system 8, and determines the video data and the audio data corresponding to the selected item. The reproduction is instructed to the recording medium 5. The recording medium 5 reproduces video data and audio data corresponding to the selected item in accordance with a command from the system controller 7, and supplies the reproduced data to the reproduction data processing system 31. Hereinafter, in the same manner as described above,
An image corresponding to the reproduced image data is displayed on the display.

In this way, only the video data and audio data of the portion where the change is detected can be quickly and easily reproduced.

As described above, when a change in the input video signal or audio signal is detected, the continuous recording mode (video and audio are continuously recorded regardless of whether or not they have changed). Mode), the input video and audio signals and the additional information are continuously recorded on the recording medium 5, so that when a change is detected, information indicating that the change is detected is added to the additional information. The additional information can be described in a predetermined field and recorded on the recording medium 5 in association with the video signal and the audio signal at the time when the change is detected. In the intermittent recording mode (a mode in which video and audio are recorded only when they change), information indicating that a change has been detected is described in a predetermined field of the additional information, and the additional information and the change The video signal and the audio signal at the time when is detected can be recorded on the recording medium 5.

Further, additional information in which information indicating that a change has been detected is described is transmitted to the modem network controller 76.
Via an external computer, or record additional information in an area accessible from the outside.When there is a transfer request from another computer, the additional information is It can be transferred to a computer.

When video signals from a plurality of video cameras or the like are input to the camera signal processing system 12, a plurality of video data are simultaneously recorded on the recording medium 5, and the video data recorded on the recording medium 5 is sequentially recorded. Playback can be performed to detect a change in video data. Similarly, when audio signals from a plurality of microphones such as video cameras are input to the microphone input audio processing system 18, a plurality of audio data are simultaneously recorded on the recording medium 5, and the audio data recorded on the recording medium 5 is transmitted. Reproduction is performed sequentially, and a change in audio data can be detected.

The process of detecting a change in video by the video signal detection control systems 16 and 38 and the process of detecting a change in audio by the audio signal detection control systems 22 and 42 are performed in a television broadcast by CM (commercial). Can be applied to the detection of Further, the present invention can also be applied to the case of detecting a scene change (scene change). Then, by recording the detected change as an ID, it is possible to prevent the CM from being reproduced at the time of reproduction, and to search for a scene change.

Further, in the above embodiment, by assigning a video signal from a monitoring video camera or the like to a predetermined input channel, a monitoring function, a recording / reproducing function for recording / reproducing a normal broadcast program, and a monitoring / reproducing function are provided. It is possible to construct an apparatus having a search function for searching for a video from a video camera and a video of a broadcast program input from another input channel. In that case, the above embodiment is assumed to be able to simultaneously process video and audio signals from a plurality of input channels.

In the above embodiment, the video signal from one camera system is input to the camera signal processing system 12, but the video signals from a plurality of camera systems are input simultaneously. It is also possible to

Further, in the above embodiment, in addition to an optical disk, a hard disk, and a memory card, a DVD (digital versatile disc), a mini disk (MD) (trademark), and other media capable of random access are used as recording media. It can be used.

[0082]

According to the recording / reproducing apparatus according to the first aspect, and the recording / reproducing method according to the seventh aspect, the input one
Or, independently of the recording of a plurality of signals on the recording medium, the signal recorded on the recording medium is reproduced, a change in the reproduced signal is detected, and if a change in the signal is detected, the change in the signal is detected. Since the indicated information is recorded on the recording medium in association with the signal, it is possible to efficiently detect a change in the video data and the audio data by the background processing.

According to the recording / reproducing apparatus according to the eighth aspect and the recording / reproducing method according to the ninth aspect, one or a plurality of signals are inputted, a change in the inputted signals is detected, and the signals are constituted. When a change in the video signal is detected, the video signal is recorded on a predetermined recording medium, the level of the audio signal constituting the signal is equal to or higher than a predetermined reference value, and the audio signal changes within a predetermined reference time. During recording, the sound is recorded on the recording medium, so that the recording medium can be used efficiently.

According to the recording medium of the tenth aspect, at least video data, audio data, information indicating a change in the video data, and information indicating a change in the audio data are recorded, and the change in the video data is recorded. Since the information indicating and the change indicating the audio data are recorded in association with the video data and the audio data, the video data and the audio data at the time when the video data or the audio data change can be easily searched. be able to.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of an embodiment of a video / audio recording / reproducing apparatus to which a recording / reproducing apparatus of the present invention is applied.

FIG. 2 is a block diagram showing a configuration example of a recording system of the video / audio recording / reproducing apparatus of FIG.

FIG. 3 is a block diagram showing a configuration example of a reproduction system of the video / audio recording / reproduction device of FIG. 1;

FIG. 4 is a block diagram illustrating a configuration example of video signal detection control systems 16 and 38;

FIG. 5 is a block diagram illustrating a configuration example of audio signal detection control systems 22 and 42;

FIG. 6 is a block diagram showing a configuration example of an additional function processing system 45 in FIG. 3;

FIG. 7 is a diagram showing a format of additional information.

FIG. 8 is a diagram showing a recording format of recording data.

FIG. 9 is a diagram showing a display example of a search screen.

[Explanation of symbols]

1 recording signal processing system, 2 signal detection system, 3 reproduction signal processing system, 4 signal detection system, 5 recording medium, 6 recording control signal input system, 7 system controller, 8 reproduction control signal input system, 11 video signal processing system, 12 camera signal processing system, 13 tuner system, 14 video signal switching system,
15 video signal A / D conversion system, 16 video signal detection control system, 17 video signal band compression processing system, 18 audio signal processing system, 19 microphone input audio processing system, 20 audio signal switching system, 21 audio signal A / D conversion System, 22 audio signal detection control system, 23 audio signal band compression processing system, 24
Recording data processing system, 31 playback data processing system, 32 video signal band extension processing system, 38 video signal detection control system, 3
9 video signal D / A conversion system, 40 video signal output processing system, 41 audio signal band expansion processing system, 42 audio signal detection control system, 43 audio signal D / A conversion system, 44 audio signal output processing system, 45 additional functions Processing system, 51 histogram difference detection block, 52 inter-frame difference detection block, 53 motion vector detection block, 54 detection determination unit, 61 level change detection block, 62 LR phase difference detection block, 63 spectrum difference detection block, 6
4 Detection determination unit, 71 ID determination control unit, 72 recording medium interface, 73 CPU, 75 display control unit, 76 modem network control unit, 77 input / output control unit, 74 storage unit

Claims (10)

[Claims] An input unit that inputs one or a plurality of signals; a first recording unit that records the signal input by the input unit on a predetermined recording medium; and a recording unit that records the signal by the first recording unit. A reproducing unit that reproduces the signal recorded on a medium; a detecting unit that detects a change in the signal reproduced by the reproducing unit; and a change in the signal when a change in the signal is detected by the detecting unit. Second recording means for recording information indicating the signal on the recording medium in association with the signal, wherein the reproducing means is independent of the recording of the signal on the recording medium by the first recording means. Reproduces the signal recorded on the recording medium, the detecting means detects a change in the signal reproduced by the reproducing means, and the second recording means If a change in the serial signal is detected, the recording and reproducing apparatus characterized by recording on the recording medium the information indicating the change of the signal in association with said signal. 2. The recording / reproducing apparatus according to claim 1, further comprising providing means for providing a signal whose change has been detected by said detecting means in response to an external access. 3. The recording / reproducing apparatus according to claim 1, further comprising display control means for displaying a list of information indicating a change in the signal detected by the detection means on a predetermined screen. 4. The recording / reproducing apparatus according to claim 1, wherein the signal includes a video signal, and the detection unit detects a change in the video signal. 5. The recording / reproducing apparatus according to claim 1, wherein the signal includes an audio signal, and the detecting unit detects a change in the audio signal. 6. The second recording means records information indicating that overwriting is possible on the recording medium in association with the signal when the detection means does not detect a change in the signal. The first recording means overwrites a new signal as necessary in an area of the recording medium in which the signal associated with the information indicating that overwriting is possible is recorded. The recording / reproducing apparatus according to claim 1, wherein: 7. An input unit for inputting one or a plurality of signals, a first recording unit for recording the signal input by the input unit on a predetermined recording medium, and the recording by the first recording unit. A reproducing unit that reproduces the signal recorded on a medium; a detecting unit that detects a change in the signal reproduced by the reproducing unit; and a change in the signal when a change in the signal is detected by the detecting unit. And a second recording unit for recording information indicating the signal on the recording medium in association with the signal, wherein recording of the input one or a plurality of signals on the recording medium is performed. Independently reproduces the signal recorded on the recording medium, detects a change in the reproduced signal, and indicates a change in the signal when a change in the signal is detected. Reproducing method characterized by recording on the recording medium distribution in association with said signal. 8. An input unit for inputting one or a plurality of signals, a detection unit for detecting a change in the signal input by the input unit, and a change in a video signal constituting the signal detected by the detection unit When the video signal is recorded on a predetermined recording medium, the level of an audio signal constituting the signal by the detection means is a predetermined reference value or more, and the audio signal is a predetermined An audio recording unit for recording the audio on the recording medium when it changes within a reference time. 9. When one or more signals are input, a change in the input signal is detected, and when a change in a video signal forming the signal is detected,
The video signal is recorded on a predetermined recording medium, and when the level of an audio signal constituting the signal is equal to or higher than a predetermined reference value, and the audio signal changes within a predetermined reference time, the audio signal is output. Is recorded on the recording medium. 10. At least video data, audio data, information indicating a change in the video data, and information indicating a change in the audio data are recorded, and the information indicating the change in the video data and the audio data are recorded. A recording medium wherein information indicating a change is recorded in association with the video data and the audio data.