JP2731181B2 - Image transmission system and receiving device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image transmission system and a receiving device.

[Conventional technology]

FIG. 4 is a schematic configuration diagram of a conventionally known still image reproducing apparatus, particularly illustrating a case where two still images are selected and viewed on one monitor. In the figure, 6 reproduces a still image signal recorded on a video floppy,
A still picture reproducer 8 which converts and outputs a continuous standard television signal (for example, NTSC signal, hereinafter referred to as a video signal), and 8 selects and monitors video signals transmitted from a plurality of still picture reproducers 6 A video switcher for inputting to the television 2; 58, an infrared wireless remote commander for remotely controlling the playback device 6;

In FIG. 4, a video floppy 4 has a field picture of a still picture video signal in 50 concentric tracks.
A well-known still image recording medium that has the ability to record
The still picture video signal is derived through the configuration shown in the block diagram of FIG. As a recording format, a well-known method of FM-modulating a luminance signal Y, FM-modulating a color difference signal RY and a color difference signal BY in a line-sequential manner, and frequency-multiplexing and recording each of them is generally applied. You. The frequency allocation diagram of this signal recording format is as shown in FIG. 7, and the luminance signal Y is recorded by a deviation FM with a sync chip of 6 MHz and a white level of 7.5 MHz. Also, the color difference signal RY
And BY are FM-recorded line-sequentially at center frequencies of 1.2 MHz and 1.3 MHz, respectively.

As shown in FIG. 5, the video floppy disk 4 has a built-in floppy disk 10 therein, and a speed (in accordance with the NTSC standard) adapted to the cycle of the standard television signal by the sheet motor 12 inside the still picture reproducing device 6. In the case of 3600 rpm). As the floppy disk 10 rotates,
A still image video signal for one field from one track is alternately read out from two tracks through the magnetic head 14, whereby a still image video signal for one frame is derived as a modulated signal. This signal is a preamplifier
The signal is amplified by the demodulator 16 and demodulated and filtered by the demodulator 18 based on the recording format.
Returned to Y / BY. The luminance signal Y and the color difference signal R-Y / B
-Y is modulated by the NTSC encoder 20 into an NTSC signal which is a standard television signal as shown in the waveform diagram of FIG.

 The operation of such a configuration will be described below.

When reading out a still image signal recorded on the video floppy 4, the video floppy 4 may be loaded into the still image reproducing device 6, and the output still image video signal may be directly connected to the monitor television 2. It is possible to watch the reproduced image. In addition, two or more playback devices 6
When the user wants to watch a still image video signal from the camera, the reproduced signal of an arbitrary still image reproducer 6 can be monitored by selecting a signal with the video switcher 8. Still images are stored on the floppy disk 10 in the video floppy 4.
Since a plurality of images are recorded on a plurality of tracks set in, an arbitrary image can be called and viewed by selecting this track through an operation unit (not shown). When the still picture reproducing device 6 is installed near the monitor / television 2 and viewed from a distance, an arbitrary track can be selected by using the infrared wireless remote commander 58, and any recorded still picture can be selected. It is also possible to play back and watch.

[Problems to be solved by the invention]

However, such a conventional configuration has the following problems.

First, the number of still images that can be recorded on the video floppy 4 is limited, and currently 25 frames are used for frame images and 50 images are used for field images. However, the time for watching a still image is very limited, and therefore, when watching a number of video floppies 4, it is necessary to frequently change the video floppies. Therefore, when the still image reproducing device 6 is near the monitor / television 2 and is viewed from a distance, the replacement of the video floppy 4 becomes very troublesome.
In the case where a plurality of still picture reproducing devices 6 are watched while being switched by the video switcher 8, the video switcher 8 may be used.
Switching work becomes very troublesome. Further, when controlling the still image reproducing device 6 from a distance by the infrared wireless remote commander 56, the control code of the infrared wireless remote commander 58 for preventing crosstalk is changed for a plurality of still image reproducing devices 6. It is necessary and the usability is very poor.

To solve such a problem, a method of using the still image reproducing device 6 and the video switcher 8 at hand can be considered, but there is a problem that the wiring work is troublesome unless the device is permanently installed.

Therefore, an object of the present invention is to provide a high usability without the need for troublesome control code wiring or the like in view of the above point, and further, a user can surely confirm that an image signal has been transmitted. An image transmission system and a receiving device are provided.

[Means for solving the problem]

In order to achieve the above object, an image transmission system according to the present invention (corresponding to, for example, one embodiment shown in FIG. 2) corresponds to a recording medium (also a floppy disk 10 in FIG. 2). ), Reproducing means for reproducing an image signal of a predetermined screen from the image signal recorded in the image signal (corresponding to 12 to 20, 56), and the reproducing means for wirelessly transmitting the image signal in accordance with a user's instruction. Transmission means for modulating an image signal reproduced by means of wireless transmission (also, 28, 30, 31, 3
It is equivalent to 4,36. And a demodulating unit (also corresponding to 38, 40, 42) for receiving an image signal wirelessly transmitted by the transmitting unit and demodulating the received image signal. ), And supplies the image signal demodulated by the demodulation means to an output device (also equivalent to 2) that outputs an image related to the image signal via a memory (also equivalent to 44). Supply means (also corresponding to 46 to 54), and the user is informed of the writing of the demodulated image signal to the memory in screen units (page 14, line 9, line 9 of this specification). (Refer to page 15, line 5). Receiving device (not shown, which corresponds to the electronic buzzer 7 for generating the buzzer sound shown in FIG. 3D and the controller unit 50). Similarly, it corresponds to 24 in FIG. 2.)
And.

Further, the receiving device according to the present invention is a receiving device (24 in FIG. 2) that receives a wirelessly transmitted image signal of a predetermined screen, which is modulated for wireless transmission according to a user's instruction.
Is equivalent to And a demodulating means for receiving the wirelessly transmitted image signal of the predetermined screen and demodulating the received image signal, and transmitting the image signal demodulated by the demodulating means via a memory to the image signal. And an informing means for informing the user of the writing of the demodulated image signal into the memory in screen units.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a still image reproducing apparatus according to an embodiment of the present invention, particularly illustrating a case where still image signals from two reproducing units are viewed on one monitor.

In the figure, a still image reproduction / transmission unit 22
After reproducing the still picture signal recorded on the floppy 4 and obtaining a continuous standard television signal (for example, NTSC signal, hereinafter referred to as video signal), several units of the still picture video signal, for example, several field signals Alternatively, several frame signals are modulated and transmitted as optical signals. On the other hand, the image receiving / reproducing unit 24 demodulates several units of still image video signals sent from the still image reproducing / transmitting unit 22 by optical signals, and stores one unit of the image signal from the demodulated video signals. The video signal is converted into a still image video signal and output to the monitor television 2.

The electronic buzzer 7 notifies the operator of the still image reproduction / transmission unit 22 of the fact that one unit of the image transferred from the still image reproduction / transmission unit 22 to the image reception / reproduction unit 24 is stored. It is for. The video floppy disk 4 is a well-known still image recording medium capable of recording 50 field images of a still image video signal on 50 concentric tracks.

FIG. 2 is a block diagram for explaining a detailed configuration of the still image reproduction / transmission unit 22 and the image reception / reproduction unit 24 of FIG. As shown in the figure, the video floppy 4 is reproduced by the still image reproduction
The floppy disk 4 incorporates a floppy disk 10 and is rotated as necessary by a sheet motor 12 controlled by a disk drive controller 56 at a speed corresponding to the cycle of a standard television signal.

As the floppy disk 10 rotates, the magnetic head 14
, A still image video signal for one field from one track is alternately read out for two tracks, and thereby a still image video signal for one frame is derived as a modulated signal. This signal is amplified by the preamplifier 16, demodulated and filtered by the demodulator 18 based on the recording format, and returned to the luminance signal Y and the color difference signals RY / BY. The luminance signal Y and the color difference signals RY / BY are NTSC
The encoder 20 converts the signal into an NTSC signal, which is a standard television signal.

The NTSC signal obtained by the NTSC encoder 20 is
The light is modulated by a modulation unit 28 controlled by 34 and supplied to a light transmitting element 31 through a light transmitting element driving unit 30. The light transmitting element 31 transmits the modulated still image video signal in the form of an optical signal. By the way, the still image video signal is transmitted by the controller 34 by a signal from the operation unit 36 operated by the operator, and several units (several fields or several frames) are transmitted while the operation unit 36 is operated. Controlled.

On the other hand, in the image receiving / reproducing unit 24, the light receiving element 38 receives the modulation signal of the still image video signal in several units transmitted as an optical signal from the light transmitting element 31 of the still image reproducing / transmitting unit 22. The received signal is filtered and amplified by the preamplifier 40 according to the modulation frequency, and the modulated signal extracted here is demodulated by the demodulator 42 and returned to several units of still image video signals. The still image video signal includes a synchronization signal, and is extracted through the synchronization separation unit 54. This signal is checked by the controller unit 50, and the controller unit 50 detects that a still image video signal has been received based on the synchronization signal.

When detecting the synchronization signal, the controller unit 50 starts the writing operation of the memory unit 44 based on the synchronization signal. The memory unit 44 is normally in a continuous read state, but shifts to a write operation in response to a write command from the controller unit 50, and writes one unit of a still image video signal converted into a digital signal through the A / D unit 52.

When this write operation is completed, the memory unit 44 enters a read state, and outputs a continuous still image video signal as a digital value. This signal is analog-converted by the D / A unit 46, amplified by the amplifier 48, and transmitted as an NTSC signal as shown in FIG.

When the writing of the image signal for one unit to the memory section 44 is completed, the controller section 50 sends the electronic buzzer 7.
A drive signal is sent to the
The operator of 22 is notified that the signal transmission has been completed.

Next, the operation of such a configuration will be described with reference to the time chart shown in FIG.

First, in an initial state, the sheet motor 12 for driving the floppy disk 10 in the video floppy 4 is stopped, and the magnetic head 14 is also separated from the floppy disk 10. In this state, when an operator gives an instruction along with a track number for which a still image needs to be reproduced via the operation unit 36, an operation signal _SOP indicating this is input to the controller 34. The controller 34 to which the operation signal _SOP has been input is a disk drive controller.
The sheet motor 12 is activated through 56, and the magnetic head 14 is brought into contact with the track position corresponding to the track number specified by the operation unit 36 of the floppy disk 10.

As a result, the floppy disk 10 of the video floppy disk 4 is rotated by the sheet motor 12 at a speed corresponding to the cycle of the standard television signal, and the modulated signal of the still image signal recorded thereon is taken out through the magnetic head 14. It is. This signal is amplified by the preamplifier 16 and the demodulator
The signal is demodulated and filtered based on the recording format by 18 and is converted into an NTSC signal which is a standard television signal by the NTSC encoder 20. As a result, as shown in FIG. It is obtained only during a period other than the period required for starting the sheet motor 12 during the period of FIG.

An NTSC signal corresponding to several units of an image obtained by the NTSC encoder 20 is modulated by a modulator 28 controlled by a controller 34 and supplied to a light transmitting element 31 through a light transmitting element driver 30. As a result, the light-sending element 31 sends the still picture video signals for several unit of obtained operation period of the operation portion 36 which is modulated by the light beam B _S.

On the other hand, the image receiving and reproducing unit 24 is a still image reproducing and transmitting unit.
The still picture video signal sent come several units from the sending device 31 of the 22 in the optical signal B _S received by the light receiving element 38. The received signal is filtered and amplified by the preamplifier 40 according to the modulation frequency, and the modulated signal extracted here is demodulated by the demodulator 42 and returned to several units of still image video signals. The synchronization signal included in the still image video signal is separated by the synchronization separation unit 54.
It detects that the image signal has been received by Sa.

The controller 50 that has detected the reception state of the image signal causes the memory 44 to perform a write operation during the period of FIG. 3C based on the synchronization signal obtained through the synchronization separator 54. Normally, the memory section 44 has T ₀ , T _{2 in} FIG. 3 (E).
While during a continuous read state, the period of T ₁ by a write command from the controller unit 50 proceeds to the write operation, the synchronizing signal obtained by the synchronization separation unit 54 Sb, the gated clock for writing based on Sc The still image video signal converted into a digital signal through the A / D unit 52 is written for one unit.

When the write operation is completed, the controller unit 50 detects the end of the write operation by detecting the synchronization signal Sd, sets the memory unit 44 to the read state, and digitally outputs a continuous still image video signal. At the same time, a buzzer signal as shown in FIG. 3D for notifying that the writing of the image to the memory unit 44 has been completed is sent from the controller unit 50, and this is notified to the operator through the electronic buzzer 7. I do. The operator ends the operation of the operation unit 36 based on the sound of the electronic buzzer.

The output signal of the memory unit 44 is converted into an analog signal by the D / A unit 46, amplified by the amplifying unit 48, and transmitted as a continuous NTSC video signal as shown in FIG. As a result, it is possible to appreciate the still picture image based on the still picture video signal transferred from the still picture reproduction / transmission unit 22 on the monitor television 2.

When the transfer of the still image video signal is completed and the operator stops operating the operation unit 36, the still image reproduction / transmission unit 22
In, the rotation of the sheet motor 12 is stopped by the control signal from the controller 34, and at the same time, the magnetic head 14
Is pulled away from the floppy disk 10. This state is maintained until an instruction to reproduce the next still image is input from the operation unit 36.

Further, when a still image is to be reproduced from the plurality of still image reproduction / transmission units 22, the still image can be freely accessed without using a device such as a switcher as long as they do not conflict with each other.
The image once captured by the image receiving and reproducing unit 24 is retained until the next image is transferred from any of the still image reproducing and transmitting units 22. Of course, the still image reproducing and transmitting unit 22 exchanges the video floppy 4 And will be kept while you do.

In the above embodiment, a known infrared light emitting diode can be used as the light transmitting element 31. When the distance is long, sufficient performance can be obtained by using a laser diode. Further, the modulation method and the modulation frequency for converting the still image video signal into the optical signal should be selected from the frequency band of the NTSC and the frequency characteristics of the light transmitting element 31 and the light receiving element 38. FM modulation of about 7 MHz to 20 MHz is practical.

In the above embodiment, the case where the still image video signal is handled based on the NTSC baseband signal is exemplified. However, the embodiment of the present invention is not limited to this, and the still image video signal is handled with PAL and HD signals, and RGB and color difference signals etc. Needless to say, this may be done.

In the above-described embodiment, the case where the receiving side detects the synchronization signal and stores the image is illustrated. However, the control signal is added to the still image video signal transmitted prior to the image transmission, One unit of the image signal may be stored by the control signal. In addition to the transmission command, the control signal includes, for example, a discrimination signal indicating whether one unit of the transmission signal is a field or a frame, a track number, an ID number of the still image reproduction / transmission unit 22, and other additional information. May be included.

As a method of adding a control signal, as shown in a waveform diagram of FIG. 8, a video signal may be set and transmitted in a V blanking period. As shown in the format diagram of FIG. 9, a general configuration including a briamble, a postamble, and a synchronization pattern is applicable to the format of the control signal. May be provided with various information.

Further, in the above-described embodiment, the configuration in which the floppy disk is stopped except during the transfer of the still image video signal is exemplified. However, this is not an essential requirement for the embodiment of the present invention, and the power consumption and the floppy disk are not required. The present invention also aims at the effect of preventing wear of the magnetic head, and it is of course within the scope of the present invention to adopt a configuration for continuously reproducing a floppy disk.

 According to this embodiment, the following effects can be obtained.

First, when watching any number of video floppies, it is necessary to frequently change the video floppies in view of the viewing time of still images and the number of still images stored in the video floppies. Since the image reproducing / transmitting unit can be kept at hand, the trouble associated with replacing the video floppy is eliminated.

Also, since there is no erasure or disturbance of the screen when exchanging the video floppy or when feeding the track, there is a feature that the appreciation of the still image is very easy.

Furthermore, even when selectively viewing still images from a plurality of still image playback / transmission units, there is no need to prepare or operate devices such as a video switcher, and the operation is very simple. It is possible to appreciate a reproduced image of an arbitrary still image reproducing / transmitting unit.

At the same time, since an optical signal is used for image transfer, there is no wiring, and the time and effort required for installation and preparation are eliminated, and a system suitable for home use can be provided.

On the other hand, when trying to obtain a continuous still image video signal that can be reproduced on a monitor television by reproducing a video floppy, it is necessary to keep reading the signal from the magnetic head while constantly rotating the floppy disk. On the other hand, in the configuration of the present invention, the reproduction of the still image by the floppy disk and the magnetic head can be performed in a very short time during the transfer of the still image. Still images can be viewed, and the power consumption of the sheet motor for rotating the floppy disk can also be suppressed. Is possible.

[Effects of the Invention] As described above, according to the present invention, an image signal of a predetermined screen is transmitted to a receiving side to which an image output device such as a monitor is connected without troublesome wiring or the like for the user. Can be transmitted wirelessly. Further, since the user is notified of the end of the image signal for each screen, even if a transmission error occurs during wireless transmission, the user can easily give an instruction to transmit the image signal again,
This makes it possible to reliably transmit the image signal wirelessly.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an image transmission system and a receiving apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram for explaining details of the configuration of FIG. 1, and FIG. FIG. 4 is a timing diagram for explaining the operation of the configuration, FIG. 4 is a schematic configuration diagram of a conventional still image reproducing apparatus, FIG. 5 is a block diagram for explaining the details of the configuration of FIG. 4, and FIG. FIG. 7 is a frequency allocation diagram for explaining a video floppy recording format, FIG. 8 is a waveform diagram for explaining a control adding method, and FIG. 9 is a control data format. FIG. 2 ... Monitor television, 4 ... Video floppy, 7 ... Electronic buzzer, 10 ... Floppy disk, 12 ... Seat motor, 14 ... Magnetic head, 18 ... Demodulator, 20 ... NTSC encoder, 26 processing gate, 28 modulation section, 32 light transmitting element, 38 light receiving element, 42 demodulation section, 44 memory section.

Claims (2)

(57) [Claims] 1. A reproducing means for reproducing an image signal of a predetermined screen from an image signal recorded on a recording medium, and an image signal reproduced by the reproducing means for wirelessly transmitting the image signal according to a user's instruction. A transmission device that modulates the image signal and wirelessly transmits the image signal; a demodulation device that receives the image signal wirelessly transmitted by the transmission device and demodulates the received image signal; Supply means for supplying, via a memory, an output device that outputs an image related to the image signal; and notification means for notifying the user of writing of the demodulated image signal to the memory in screen units. An image transmission system comprising: a receiving device having: 2. A receiving apparatus for receiving an image signal of a predetermined screen modulated and transmitted wirelessly according to an instruction of a user and receiving the image signal of the predetermined screen transmitted wirelessly, Demodulation means for demodulating the received image signal; supply means for supplying, via a memory, the image signal demodulated by the demodulation means to an output device for outputting an image related to the image signal; and Notifying means for notifying the user of the writing of the signal into the memory in screen units.