JPH1098688A - Device and method for signal reception - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily perform gate pass control by recording a video audio signal in a temporary storage mechanism by a signal switch mechanism by pressing an operation button and simultaneously reproducing the video audio signal at higher speed than the recorded speed and transmitting a reproduced video signal to a video display. SOLUTION: When the operation button 19 is pressed, a control mechanism 17 switches the signal switch mechanism 12, 16, the temporary storage mechanism 14 stores a start address in a storage mechanism 20 and continues to record the video audio signal. And when the operation button 19 is pressed again to cancel absence by a viewer, the control mechanism 17 successively transmits the address stored in the storage mechanism 20 to the temporary storage mechanism 14 from the address where recording is started as continuously turning a light of the operation button 19 on and instructs reproduction of the video audio signal from the address where the recording is started for informing the absence state is canceled. Consequently, the video/audio signal from the start of the absence is displayed on a video display 18. And the video audio signal is displayed by a fixed time interval of an actual broadcasting signal since reading speed and writing speed of data in the temporary storage mechanism 14 are coincident each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for communicating images and sounds in real time, even if the user of the received information temporarily leaves the receiving device due to the convenience of the receiving side. The present invention relates to a signal receiving apparatus and a signal receiving method capable of continuously resuming reception from the same.

[0002]

2. Description of the Related Art As a method of storing transmitted information when a receiver of the transmitted information is not present, there is a telephone having an answering machine recording function. Japanese Patent Application Laid-Open No. 7-336431 discloses a telephone equipped with an answering machine recording function, a recording switch and a reproduction switch that can be operated only during a call, and a function capable of recording and reproducing during a call. Have been.

Japanese Patent Application Laid-Open No. Hei 7-250305 discloses an apparatus which compresses and stores a transmitted television signal, expands the stored information, and allows viewing from the start of the program.

[0004]

For example, in a television receiving a transmitted television signal, if the viewer leaves the television for some reason, the viewer is transmitted while away. In order to avoid discarding the information or to avoid the loss of the information, a television signal is recorded during the recording. However, the information obtained from the television when the viewer returns may be unclear due to lack of information while away, and the viewer may want to see the recorded information. Since the user watches the television program after the end of the television program he / she thinks, the relevance of the information may be unclear.

[0005] In addition, when monitoring a plant or the like, if a monitor person temporarily leaves the monitor,
Information is lost while you are away. Further, even if the video projected on the monitor is recorded while the user is away, the video obtained in real time cannot be viewed during the reproduction. This problem cannot be solved even by using the prior art described in Japanese Patent Application Laid-Open No. 7-250305.

The present invention solves such a problem and records video while the viewer is away from the monitor.
It is an object of the present invention to provide a receiving apparatus that enables a video to be displayed on a monitor when a viewer returns and separates.

[0007] Further, a receiving device capable of recording a real-time video obtained while playing back a video while being away from the camera and increasing the playback speed faster than the recording speed allows the real-time video to be finally viewed. Is to provide.

[0008]

The object of the present invention is to provide a receiving mechanism for converting a signal sent from the outside into a video / audio signal,
A storage mechanism having a recording mechanism for recording the video and audio signals converted by the receiving mechanism and a reproducing mechanism for reproducing the recorded video and audio signals, a display device for displaying the video and audio signals, and the receiving mechanism A first signal switching mechanism for sending the converted video / audio signal to either the storage mechanism or the second signal switching device; and a video / audio signal from the first signal switching device or the storage mechanism. A second signal switching mechanism for sending any one of the reproduced video and audio signals to the display device, and controlling the first and second signal switching mechanisms; And a control mechanism that records the video and audio signals recorded on the recording device and displays the video and audio signals recorded on the recording device on the display device.

[0009] It is another object of the present invention to provide a signal receiving method for recording or reproducing a transmitted video / audio signal in a recording apparatus in response to an external instruction, wherein the video / audio signal transmitted based on a first external instruction is provided. Is recorded on a recording device at a constant speed, and a video signal recorded based on a second instruction from the outside is reproduced from the storage device at a speed higher than the recording speed, and a video and audio signal recorded on the storage device And when the video and audio signals to be reproduced from the storage device are substantially the same, the recording and reproduction to and from the storage device are terminated.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a television receiver according to one embodiment of the present invention.
8, and operation buttons 19. The broadcast receiving mechanism 11 of the receiving unit 10 converts a wireless or wired broadcast signal into a video / audio signal. The signal switching mechanism 12 stores the video / audio signal obtained by the broadcast receiving mechanism 11 in a temporary storage mechanism 14.
To be sent to the video display unit 18 as it is. The temporary storage mechanism 14 is a recording device for video and audio signals, and is constituted by a semiconductor memory, and stores audio data and video frame data that have been converted into digital signals by the A / D converter 13. Here, generally, in television broadcasting, etc.,
A moving image is transmitted by continuously transmitting one screen of stopped video in a time series, and the video data for each frame is hereinafter referred to as “frame data”. Recording and reproduction of frame data in the temporary storage mechanism 14 are performed by the control mechanism 17.
Can be performed simultaneously and in parallel. Further, the control mechanism 17 has a function of allowing the temporary storage mechanism 14 to reproduce frame data recorded in time series from an arbitrary frame at an arbitrary speed. The signal switching mechanism 16 operates in conjunction with the signal switching mechanism 12, and when the video / audio signal from the broadcast receiving mechanism 11 is directly displayed on the video display section 18, the video / audio signal recorded in the temporary storage mechanism 14 is displayed on the video display section. The display is switched between the display on the unit 18. The video display unit 18 provides audio and video to a viewer by inputting a video / audio signal, and generally includes a CRT display and a speaker. The control mechanism 17 includes an operation button 19, signal switching mechanisms 12, 16 and a temporary storage mechanism 14, an A / D converter 1
3. The D / A converter 15 is collectively managed. The operation button 19 is used when the viewer needs to leave the television receiver or when the viewer returns to the television receiver again.
This is for inputting the start / end of the absence state to the control mechanism 17 as an event. The operation button 19 has a built-in lighting device for notifying the current state to the outside.

Hereinafter, the operation of the control mechanism 17 will be described with reference to the flowchart of FIG. In a normal broadcast receiving state, the signal switching mechanisms 12 and 16 directly connect the broadcast receiving mechanism 11 and the video display unit 18 and reproduce the received broadcast signal as an image or sound in real time. Viewers
When it is necessary to leave the television receiver due to an incoming call or a visitor, the user presses the operation button 19 to notify the start of the absence state so that the viewer is notified that the absence state is being accepted. The mechanism 17 blinks the illumination of the operation button 19 (101). Operation button 1
9 is pressed, the control mechanism 17 causes the signal switching mechanism 1
Switching between 2 and 16 (102), the storage of the video / audio signal as the output signal of the broadcast receiving mechanism 11 in the temporary storage mechanism 14 is started (103). A start address indicating from which position of the temporary storage mechanism 14 recording has been started is stored in the storage mechanism 20 (104). After that, the temporary storage mechanism 14 continuously records the video and audio signals in the temporary storage mechanism 14,
The addresses representing the recorded positions are sequentially stored in the storage mechanism 20. This storage is continued until a stop command described later is generated. As a result, when the viewer presses the operation button 19 again from the recording start position of the temporary storage mechanism 14 to release the absence state, the storage mechanism 20 controls the control mechanism 17.
Illuminates the operation button 19 continuously to notify the release of the absence state (107), and the storage mechanism 20
Are transmitted to the temporary storage mechanism 14 in order from the start address at which the recording was started, and the reproduction of the video / audio signal is instructed from the address at which the recording was started (10).
8) Display the video / audio signal from the time of the absence state on the video display unit 18. The control mechanism 17 continues to record the video / audio information sent from the broadcast receiving mechanism 11 in the temporary storage mechanism 14 even during the reproduction, and always stores the address where the latest signal is recorded in the storage mechanism. 20. In this state, as shown in FIG. 3, the data write and read speeds of the temporary storage mechanism 14 match, and the display on the video display unit 18 is performed at a fixed time interval from the actual broadcast signal. I have.

Since the write address to the temporary storage mechanism 14 is managed so as to become larger as time passes, the write address is always larger than the read address. Therefore, by obtaining these differences, the occupation status of the temporary storage mechanism 14 can be obtained. Control mechanism 1
7 monitors the occupancy and increases the playback speed to gradually reduce the occupancy. That is, the frame rate (the number of frames per second) of a general television broadcast is 30, but the read frame rate of the temporary storage mechanism 14 is set to a large value, for example, 35. In this case, since the temporary storage mechanism 14 reads 5 extra frames per second from the number of write frames, the write address and the read address gradually approach, and eventually the write address and the read address match. When they match, the control mechanism 17 issues a stop command, ends the storage and reproduction of the temporary storage mechanism 14, and returns the signal switching mechanisms 12, 16 to the original state (110). Further, the illumination of the operation button 19 is turned off (111). As a result, the video display unit 18 receives a broadcast in real time as in the normal reception state.

It is to be noted that, instead of simply reducing the reading speed, when a blank portion of information, that is, when there is no information or there is no change, by skipping the information at the address of that portion, the write and read addresses gradually become larger. The approach may be made so that the time difference is reduced.

FIG. 4 shows a case where a magnetic tape device is used as the temporary storage mechanism 14. When the video / audio signal is recorded as an analog signal, the D / A converter 15, A in FIG.
The / D converter 13 is not required. 21 and 22 are tape running reels. Reference numeral 23 denotes a storage portion of the tape.
Roller 3 to prevent tape from loosening during playback
0 is provided. In this way, instead of the endless system in which the tape is looped, a finite tape winding system can be realized, but since the tape needs to be rewound when it reaches the end, the endless system is adopted here. doing. Information is recorded on the tape by the recording head 24 and reproduced by the reproducing head 25. When the operation button 19 is pressed, the tape does not run, and information is displayed on the video display unit 18 in real time without being recorded on the tape. When the operation button 19 is pressed, the control mechanism 17 illuminates the operation button 19 as described above, operates the recording head 24, and starts recording the audio / video information on the tape. At this time, since the tape feed mechanism 28 of the reproduction head is stopped, the tape is accumulated in the accumulation section 23. When the operation button 19 is pressed again, the operation button 19 is continuously lit,
The tape feed mechanism 28 of the reproducing head starts the running of the tape and reproduces the information from the head of the stored information, that is, the information from the time of the pause request. The time difference generated when the temporary storage mechanism 14 is a semiconductor memory is solved by managing the address. However, when the magnetic tape is a magnetic tape, the address cannot be managed. Therefore, the time difference is solved by the following method.
One is that if the speed of the tape feed mechanism 27 of the recording head is controlled slightly earlier than the speed of the tape feed mechanism 27 of the recording head, the tape in the storage portion 23 gradually decreases, and finally the recording head 24 and the reproducing head 25 There is no slack in the magnetic tape between them. In this state, the tape feed mechanisms 27 and 2
No. 8 have the same speed. Then, the speed of the tape feed mechanisms 27 and 28 is detected by the control mechanism 17, and the recording / reproduction is terminated when the speeds become substantially the same. Further, a tension detecting mechanism 29 may be provided to detect that the tape has no slack, and to determine the elimination of the time difference. At this point, the running of the tape is stopped, and the operation button 1 is pressed.
9 is turned off and returns to the initial state. Physically, the distance between the recording head 24 and the reproducing head 25 is not 0, but if it is sufficiently close, this difference can be ignored.

FIG. 5 shows an implementation method when a magnetic or magneto-optical disk is used. There are blocks on the disc for recording information, and the blocks are numbered (block addresses). The disc recording head 32 and the reproducing head 33 can access an arbitrary block address independently. . The disc recording head 21 records information at a certain recording address, and the reproducing head 22 reads out the information of the block address with a time difference, so that reproduction with a time difference can be performed. If the moving speed of the head is sufficiently fast, one recording head and one reproducing head can be used.

When the operation button 19 is pressed, recording of information is started by the disk recording head 32 in order from the block address on the disk. When the pause is released, the reproduction head 33 reads the information from the block address at which the recording was started, thereby reproducing the information from the time of the pause request.

The method of eliminating the time difference when a time difference has occurred is as follows. One is that the reading speed of the reproducing head 33 is made slightly faster than the writing speed of the recording head 32, that is, the number of blocks per unit time, so that the heads gradually approach and the time difference is eliminated. The other is that when a blank portion of information, that is, when there is no information or there is no change, by skipping the information of the block in that portion, the head gradually approaches and the time difference is eliminated. The operation of the control mechanism 17 in this case is the same as that in the flowchart of FIG. 2, and the storage mechanism 20 records the block addresses of the recording head 32 and the reproducing head 33. Then, the head mechanism 34 detects that the recording head 32 and the reproducing head 33 have accessed the same block address, and terminates reproduction and recording. At this point, the writing and calling of information to the disc are stopped, and the operation returns to the initial steady state.

FIG. 6 shows an embodiment in which the present invention is applied to a monitoring television (ITV) device in a steel plate rolling plant.
When troubles occur due to mill biting failure or meandering due to loss of synchronization, the IT
V-video plays an important role. Conventional real-time IT
In the V system, the observer cannot leave the front of the ITV monitor, and even if the video is recorded on a VTR or the like, it cannot be viewed simultaneously with the real-time video of the operation. The configuration of this system is shown below. The ITV camera 51 monitors the rolling mill. As a temporary storage mechanism 14 for temporarily storing video signals, a multi-head rewritable video disk device (hereinafter referred to as MHVD)
52 is used. The MHVD 52 has a recording head 131 and a reproducing head 132, which can simultaneously perform recording and reproduction in parallel. A real-time image or a reproduced image of the MHVD 52 is displayed on the image display unit 15 as the ITV monitor 54. A personal computer (hereinafter referred to as a PC) 53 as a monitoring mechanism is the same as the control mechanism 17 in FIG.
The control and management of the recording head 131 and the reproducing head 132 of the MHVD 52, the monitoring of the operation key 57 for operating the setting / cancellation of the pause, and the monitoring of the input of the alarm signal 18 are performed.

In the normal state, the PC 53 controls the MHVD 52 in the "write-through mode", and the input image of the MHVD is recorded on the built-in disk, but is output without any time delay. Therefore, the video signal sent from the ITV camera 51 is displayed on the ITV monitor 54 in real time. The MHVD13 disk has a finite storage capacity, but when the capacity is exceeded, the oldest video part is overwritten. Therefore, the video from the present time to the past certain time is always stored. The MHVD 52 stores one frame of a video (hereinafter, referred to as a frame) in one block. In order to record a video in real time, a frame of the video is written in a continuous block in real time. When reading,
It is possible to read at any speed from any block address. If read at a faster frame rate (number of processed frames per unit time) than at the time of writing, the output video will look like fast forward, and if it is at a slower frame rate, it will be slower. It looks like motion playback. If the block addresses are read consecutively in reverse order, reverse playback can be performed. The PC 53 has a storage mechanism similar to the storage mechanism 20 of FIG.
Manages processing block addresses.

When the "pause" key 573 of the operation keys 57 or the alarm signal 58 is input, the PC 53
To the “light still mode”. At this time PC53
Controls the recording head 131 of the MHVD 52 to instruct the reproducing head 132 of the block address written immediately before, and to repeatedly reproduce the same block address, that is, the same frame. Therefore, the image on the ITV monitor 54 is in a temporarily stopped state at that time. The recording head 131 continues the real-time recording operation as in the normal state. Here, the block addresses accessed by the recording head 131 and the reproducing head 132 move apart, and a time difference occurs and increases. The operation keys 57 include “reverse” and “forward” keys, and the PC 53 instructs the MHVD 52 to perform “reverse mode” and “forward mode” by inputting these keys. In the “reverse mode”, the PC 53 controls to continuously read the access block address of the reproducing head of the MHVD 52 in the reverse direction. Therefore, the ITV monitor 54
Displays an image in which the time is reversed. In the “forward mode”, the PC 53 controls to read the access block address of the reproduction head of the MHVD 52 continuously in the forward direction. Therefore, the past video is displayed on the ITV monitor 54. The display speed change dial 5 is provided for the operation key 57.
74, when operated in one direction, the display is delayed with respect to real time, and when operated in the + direction, it is displayed earlier with respect to real time. In the “reverse mode”, since the MHVD 52 has a finite capacity, the reproduction head 132 is immediately after the block address where the recording head 133 is currently writing. In the “forward mode”, the reproducing head 132 can access until the recording head 131 becomes the same as the block address to which writing is currently performed. In the “forward mode”, when the frame rate of the reproducing head 132 is set to be higher than the frame rate of the recording head 131, these accessed block addresses gradually approach and finally access the same block address. At this time,
Since the recording occupancy of the MHVD 52 as temporary storage becomes 0,
It returns to the "write-through mode" of the normal state.

FIG. 7 shows a display state of the monitor when an abnormality occurs. (A) is a display at the time of normal operation, and displays the state of the equipment in real time. (B) is a display at the time of occurrence of an abnormality, in which the display content at the time of detection of an abnormality signal is displayed in a suspended state. (C) and (d) are for reproducing the accumulated information and analyzing the failure status by the operation of the operator.

[0023]

According to the present invention, video is recorded while the viewer is away from the monitor, and when the viewer returns,
The video can be displayed on the monitor when the user is away, and the information of the viewer is not lost.

In addition, real-time video can be obtained by recording a real-time video obtained while the video is being reproduced while the user is away from the camera and setting the playback speed higher than the recording speed.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of the present invention.

FIG. 2 is a flowchart of a control mechanism.

FIG. 3 is an explanatory diagram of a temporary storage mechanism.

FIG. 4 is an example of another temporary storage mechanism.

FIG. 5 is an example of another temporary storage mechanism.

FIG. 6 is an example applied to a monitoring plant.

FIG. 7 is a display example of a monitor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Reception part, 11 ... Broadcast reception mechanism, 12, 16 ... Signal switching mechanism, 13 ... A / D converter, 14 ... Temporary storage mechanism,
15 D / A converter, 17 control mechanism, 18 video display unit, 19 operation button, 20 storage mechanism.

Claims (3)

[Claims] 1. A receiving mechanism for converting a signal sent from the outside into a video / audio signal, a recording mechanism for recording the video / audio signal converted by the receiving mechanism, and a reproduction for reproducing the recorded video / audio signal A storage device having a mechanism; a display device for displaying a video / audio signal; and a first device for sending the video / audio signal converted by the receiving device to one of the storage device and a second signal switching device. And a second signal switch for sending one of the video and audio signal from the first signal switching device and the video and audio signal reproduced by the storage mechanism to the display device. And a mechanism for controlling the first and second signal switching mechanisms, recording the video and audio signals converted by the receiving mechanism, and displaying the video and audio signals recorded on the recording device on the display device. Signal receiving apparatus that includes a mechanism. 2. The apparatus according to claim 1, wherein said storage means includes a recording head for recording a video and audio signal on a magnetic tape and a reproducing head for reproducing a video and audio signal recorded on the magnetic tape. Signal receiving device. 3. A signal receiving method for recording or reproducing a transmitted video / audio signal in a recording device according to an external instruction, wherein the video / audio signal transmitted based on a first external instruction is fixed. A video signal recorded on the recording device at a speed, and reproduced from the storage device at a speed higher than the recording speed, based on a second instruction from the outside; a video / audio signal recorded on the storage device; When the video and audio signals reproduced from the device are almost the same,
A signal receiving method, wherein recording and reproduction to and from the storage device are terminated.