JPS6220175A - Still picture recording system and still picture recording and reproducing system - Google Patents

Abstract

PURPOSE:To protect the recording-content in a magnetic disc from being reproduced on the sly by a third person by recording a password code with a video signal in a track of the magnetic disc. CONSTITUTION:During in a password recording operation mode, the video signal supplied to an input terminal 11, goes through a scramble circuit 14, a preemphasis circuit 15, and an FM-modulating circuit 31, and is supplied to a magnetic head 32 to be recorded in the video track of the magnetic disc 33. The password code inputted by operating a keyboard 5 through an encoder circuit 35 is supplied to the magnetic head 32 via a buffer circuit 36, an encoder circuit 23, A/D converter 24, a memory device 25, a D/A converter 26, a preemphasis circuit 27, and the FM-modulating circuit 31, and is recorded by the head 32 in an sound track of the magnetic disc 33. Accordingly, only a reproducing device provided with a function to read the password code can reproduce the content of the magnetic disc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a still image recording and reproducing method commonly used in still image recording and reproducing devices such as so-called electronic still camera devices.

[Summary of the invention]

The present invention provides a still image recording and reproducing device such as a so-called electronic still camera device, in which a password code is recorded on a track of a magnetic disk along with a video signal, so that a third party cannot access the recorded contents of the magnetic disk without permission. The above-mentioned password code can be used to prevent the data from being played back.

[Conventional technology]

Conventionally, charge-coupled devices (CCDs)
An electronic still camera device has been proposed that records on a magnetic disk any one field or frame of video signal captured by an imaging device using a solid-state image sensor such as a couple-ed device (Coupled Device). (Sho 57-197021, etc.).

In this type of electronic still camera, the video signal from the imaging device is extracted by gating one field or one frame at the time of any shutter operation, and this signal is
The field is recorded on the magnetic disk in a single annular track. Note that the signal of one frame is 2
Recorded using a book trunk. In this device, a video signal of a still image can be formed by repeatedly reproducing one track or alternately and repeatedly reproducing two tracks.

In addition, in such electronic still camera devices, for example, digital signal processing technology is used to compress the audio signal in the time axis, raise the frequency band of the audio signal to the band of the video signal, and use the same recording system as the video signal. I am trying to record using .

For example, in FIG. 8A showing the configuration of the recording system of a conventional electronic still camera system, the video signal is input to the input terminal 101.
is supplied to the recording circuit 102 and converted into a predetermined recording signal,
It is supplied to the FM modulation circuit 105 through a pre-emphasis circuit 103 with non-linear characteristics and a changeover switch 104.
The signal is recorded on the disk 107 by the magnetic head 6 as an FM signal.

Further, the audio signal is supplied to the input terminal 108 and is converted into an analog signal through a noise reduction encoder circuit 109.
The signal is supplied to a digital (A/D) converter 100. This A
The signal digitally converted by the /D converter 100 is supplied to the memory device 111. A temporally compressed signal read out from the memory device 111 is supplied to a digital-to-analog (D/A) converter 112 . The signal converted into analog by this D/A converter 112 is supplied to a pre-emphasis circuit 113 having linear characteristics, and the signal from this pre-emphasis circuit 113 is transmitted to the selector switch 1.
04 to the FM modulation circuit 105, and the FM
The magnetic head 106 outputs the signal to the disk 7.
recorded in

The video and audio signals recorded on the disk 107 are reproduced as follows.

That is, in FIG. 8B showing the configuration of the reproduction system of the conventional electronic still camera system, the signal reproduced from the disk 107 by the magnetic head 106 is transmitted to the FM demodulation circuit 115.
supplied to When the signal demodulated by this FM demodulation circuit 115 is a video signal, this signal is taken out to an output terminal 119 through a low-pass filter 116, a de-emphasis circuit 117 with non-linear characteristics, and a reproduction circuit 118.

Furthermore, when the demodulated signal is an audio signal, this signal is passed through a low-pass filter 120 and a de-emphasis circuit 121 with non-linear characteristics to an analog/digital (A
/D) is supplied to the conversion circuit 122. The signal digitally converted by this A/D converter 122 is sent to the memory device 12.
3. The signal read out from this memory device 123 after being expanded in time is a digital/analog (D/A) signal.
) is supplied to converter 124. This D/A converter 124
The analog-converted signal is taken out to an output terminal 126 through a noise reduction decoder circuit 125.

[Problem that the invention seeks to solve]

In general, electronic still camera systems that record and reproduce video signals of still images via magnetic disks, as described above, are capable of capturing images of confidential documents, etc., or images taken personally by the user of the electronic still camera. However, if you attach the magnetic disk to a playback device, you can play it freely. Further, even in the case where a magnetic disk on which still images are recorded is supplied only to subscribers through mail order or the like, a person who accidentally obtains the magnetic disk can reproduce the still image.

In view of the above-mentioned problems, the present invention provides an electronic still camera system in which video signals of still images are recorded and reproduced via a magnetic disk, in which only a person who knows a predetermined password can access the magnetic disk. The purpose is to enable recorded still images to be played back, but to prevent unspecified people from playing them back.

[Means for solving problems]

In order to solve the above-mentioned problems, the still image recording method according to the present invention, when sequentially recording one field of video signal as one track on a magnetic disk, writes a predetermined password together with the video signal as described above. It is characterized by recording on a magnetic disk.゛In addition, in order to solve the above-mentioned problems, the still image recording and reproducing method according to the present invention uses a predetermined password when sequentially recording video signals of one field and one field as one track on a magnetic disk. A code is recorded on the magnetic disk along with the video signal, and when playing the video signal from the magnetic disk, the password is input into the playback device, the password is reproduced from the magnetic disk, and the password is reproduced with the input password. It is characterized by outputting a regular playback video signal when the password codes match.

[Effect]

In the still image recording method according to the present invention, a predetermined password code is recorded on each trunk of the magnetic disk together with the video signal, so that only a playback device equipped with the function of decoding the password code can reproduce the contents of the magnetic disk. This makes it impossible to reproduce the contents of the magnetic disk using a normal reproduction device. Furthermore, in the still image recording and reproducing method according to the present invention, by inputting a PIN code into the playback device, the video signal recorded on each trunk of the magnetic disk is normally reproduced along with a PIN code that matches the PIN code. .

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to an electronic still camera system will be described in detail with reference to the drawings.

In FIG. 1A showing the configuration of the recording system of the electronic still camera in this embodiment, an input terminal 11 is provided with a video signal obtained from a solid-state image sensor (not shown) in the electronic still camera main body l shown in FIG. It is gated and supplied for one field in synchronization with the operation of the shirt button 2,
Further, an audio signal obtained by a microphone 2 provided in the electronic still camera main body l is supplied to the input terminal 21.

The video signal is supplied from an input terminal 11 to a movable terminal of a changeover switch 12, and the normal recording circuit 13 or scramble circuit 1 is selected by this changeover switch 12.
4 to a pre-emphasis circuit 15 with non-linear characteristics.

In addition, the above audio signal is input from the input terminal 21 to the selector switch 2.
2, and this selector switch 22
The signal is then supplied to an analog-to-digital (A/D) converter 24 through a noise reduction encoder circuit 23. The signal digitally converted by this A/D converter 24 is supplied to a memory device 25. The temporally compressed signal read out from the memory device 25 is supplied to a digital-to-analog (D/A) converter 26 . The signal converted into analog by this D/A converter 26 is supplied to a pre-emphasis circuit 27 having linear characteristics.

The output signals of the pre-emphasis circuits 15 and 27 are selectively supplied to the FM modulation circuit 31 by the changeover switch 30, and are recorded on the disk 33 by the magnetic head 32 as FM signals. There is.

In this embodiment, the PIN code is input as a 5-digit numerical value by operating the key buttons of the keyboard 5 provided near the viewfinder 4 of the camera body 1 shown in FIG. 14, and is also supplied to the other fixed terminal of the changeover switch 22 through the buffer circuit 36.

The five-digit numerical value, ie, the password code, set by operating the key buttons of the keyboard 5 is displayed on a display section 6 arranged in parallel with the keyboard 5. Also,
The respective changeover switches 12.22 to which the respective input terminals 11.21 are connected are operated in conjunction with each other by a changeover operation knob 7 provided on the camera body 1, and are operated in conjunction with each other. In the recording operation mode, a video signal is sent from the input terminal 11 to the normal recording circuit 13.
At the same time, the audio signal is supplied from the input terminal 21 to the encoder 23, and in the password recording operation mode, the video signal is supplied from the input terminal 11 to the scramble circuit 14, and the password code is supplied to the buffer circuit. The signal is supplied from 36 to the encoder circuit 23.

In the normal recording operation mode, the input terminal 1
1, the video signal supplied to the normal recording circuit 13,
The signal is supplied to a magnetic head 32 via a pre-emphasis circuit 15 and an FM modulation circuit 31, and is recorded on a video track on a magnetic disk 33 by the magnetic head 32.

Further, the audio signal supplied to the input terminal 21 is transmitted to the encoder circuit 23, the A/D converter 24. Memory device 25
, is supplied to the magnetic head 32 via the D/A converter 26, the pre-emphasis circuit 27 and the FM modulation circuit 31,
This magnetic head 32 records on the audio track on the magnetic disk 33.

In addition, in the password recording operation mode, the video signal supplied to the input terminal 11 is supplied to the magnetic head 32 via the scramble circuit 14, pre-emphasis circuit 15 and FM modulation circuit 31, and the magnetic head 32 drives the magnetic disk. It is recorded on the video track on 33. Then, by operating the keyboard 5, the encoder circuit 35
The pin code input through the buffer circuit 36,
Encoder circuit 23, A/Di conversion? l! 324. Memo'
It is supplied to the magnetic head 32 via the J device 25, the D/A converter 26, the pre-emphasis circuit 27 and the FM modulation circuit 31, and the magnetic head 32 outputs the signal to the magnetic disk 33.
Recorded on the audio track above.

For example, as shown in FIG. 3, the scramble circuit 14 includes two memory devices 41 and 42 each having a storage capacity of 10H, and an address controller 43 for writing and reading signals to and from these memory devices 41 and 42.
It consists of: In this scramble circuit 14, video signals supplied from the input terminal 11 via the changeover switch 12 are sequentially written into the memory devices 41 and 42.

The order in which signals are read from the memory devices 41 and 42 is controlled by the address controller 43 in accordance with the password supplied via the encoder circuit 35.

Here, if a video signal of a still image as shown in FIG. 4 is supplied to the input terminal 11, the order of the images from each of the memory devices 41 and 42 is changed, for example, as shown in FIG. The video signal of the still image is read out.

In this scramble circuit 14, the video signals read from each of the memory devices 41 and 42 are outputted from an output terminal via a through circuit 45 or an invert circuit 45 selected by a changeover switch circuit 44.

The video signal outputted via the invert circuit 45 represents an inverted image as shown in FIG. The operation of the changeover switch circuit 44 is controlled in accordance with the password code entered by operating the keyboard 5.

Next, the video and audio signals recorded on the disks 3 are reproduced as follows.

That is, in FIG. 1B showing the configuration of the reproduction system of the electronic still camera in this embodiment, a signal reproduced from the disk 33 by the magnetic head 50 is supplied to the FM demodulation circuit 51. Then, the signal demodulated by the FM demodulation circuit 51 is taken out as a video signal via a low-pass filter 52, and then sent to a de-emphasis circuit 5 with non-linear characteristics.
3, the signal is taken out to an output terminal 57 via a normal reproduction circuit 55 or a de-scramble circuit 56 selected by a changeover switch circuit 54.

Further, the audio signal is extracted from the signal demodulated by the FM demodulation circuit 51 through a low-pass filter 60, and
The signal is supplied to an analog-to-digital (A/D) conversion circuit 62 through a de-emphasis circuit 61 with non-linear characteristics. The signal digitally converted by this A/D converter 62 is supplied to a memory device 63. A temporally expanded signal read out from the memory device 63 is supplied to a digital-to-analog (D/A) converter 64 . The signal converted into analog by this D/A converter 64 is taken out to an output terminal 67 through a noise reduction decoder circuit 65 and a switch 66.

Here, in the playback system of the electronic still camera of this example,
A PIN code is input as a 5-digit numerical value by operating the ±- buttons on the keyboard 5, and the code is sent from the encoder circuit 71 to the switch 72.
The signal is supplied to the descrambling circuit 56 via the above-mentioned descrambler circuit 56, and also to the code comparator 74. The code comparator 74 is supplied with a password code obtained by a decoder circuit 73 that decodes the password code from the output signal of the decoder circuit 65 described above. This h-do comparator 74 is connected to the encoder circuit 7.
1 and the decoder circuit 7
3, and when they match, close the switch 72 to cause the encoder circuit 71 to supply the password to the descramble circuit 56; Controlling the changeover switch circuit 54 so that the video signal is supplied from the de-emphasis circuit 53 to the descrambling circuit 67;1. Further, control is performed to open the switch 66 and turn off the audio output.

As shown in FIG. 7, the descrambling circuit 56 includes two memory devices 8 each having a storage capacity of IOH.
1.82, an address controller 83 for writing and reading signals to and from these memory devices 81 and 82, a changeover switch circuit for each of the memory devices 81 and '82, and video signals read from these memory devices 81 and 82. Through circuit 85 selectively supplied via 84
and an invert circuit 86, and is configured similarly to the descramble circuit 14 described above. This scrambling circuit 56 sequentially writes the reproduced video signal supplied via the changeover switch circuit 54 into the memory devices 81 and 82, and selects the address according to the password code input via the encoder circuit 71. controller 83
The above scrambling circuit 1 is controlled by
By reading out the video signals in the reverse order of the scrambling in step 4, a video signal that reproduces the still image shown in FIG. 3 is output to the output terminal.

〔Effect of the invention〕

As is clear from the description of the embodiments above, in the still image recording and reproducing method according to the present invention, a predetermined password code is recorded on each track of the magnetic disk together with the video signal.
Only a reproducing device equipped with the function of decoding the password code can reproduce the contents of the magneto-optical disk, and it is possible to prevent ordinary reproducing devices from reproducing the contents of the magneto-optical disk. Further, in the still image recording and reproducing method according to the present invention, by inputting a password into the playback device, the video signal recorded on each track of the magnetic disk is normally reproduced along with a password that matches the password. be able to. Therefore, according to the present invention, a video signal of a still image is recorded and recorded via a magnetic disk.
In an electronic still camera system for playback, only a person who knows a predetermined password code can play back the still images recorded on the magnetic disk, and it is possible to prevent unspecified people from playing back the still images. , the intended purpose can be fully achieved.

[Brief explanation of the drawing]

1 to 7 are drawings showing one embodiment of an electronic still camera system to which the present invention is applied, and FIG. 1A is a block diagram showing the configuration of a recording system of the electronic still camera system of this embodiment. 1B is a block diagram showing the configuration of the reproduction system, FIG. 2 is an external perspective view of the electronic still camera body in the above embodiment, and FIG. 3 is a scrambling circuit provided in the recording system. FIG. 4, FIG. 5, and FIG. 6 are schematic diagrams for explaining the operation of the scramble circuit, and FIG.
The figure is a block diagram showing the configuration of a descrambling circuit provided in the reproduction system. FIGS. 8A and 8B are block diagrams showing the configurations of a recording system and a reproducing system of a conventional electronic still camera system. 1... Camera body 5.70... Keyboard 12.22.30... ・Selector switch 14... Scramble circuit 32.50... Magnetic head 33... Magnetic disk 35... Encoder circuit 73 ... Decoder circuit 74 ... Code comparator

Claims (2)

[Claims] (1) A still image recording method characterized in that when one field of video signals is sequentially recorded on a magnetic disk as one track, a predetermined password code is recorded on the magnetic disk together with the video signal. . (2) When sequentially recording one field of video signals as one track on a magnetic disk, a predetermined password code is recorded on the magnetic disk together with the video signal,
When reproducing a video signal from the magnetic disk, a PIN code is input into the reproducing device, and the PIN code is reproduced from the magnetic disk, and when the input PIN code and the playback PIN code match, a legitimate reproduced video signal is output. A still image recording and reproducing method characterized by output.