JPS62269583A - Data recording system for still picture recording device - Google Patents

Abstract

PURPOSE:To arrange still picture information recorded at a magnetic disk and to facilitate the prevention of the viewing of the still picture information to an unspecified person by removing a signal in charge of the information such as character information except the image information of a video signal and inserting and recording a data signal showing the disk information, etc., of the disk to the signal in which the signal is removed. CONSTITUTION:A Y/C signal separating circuit 100 separates a compound video signal inputted through a video signal input terminal T1, for example, obtained by a TV broadcasting receiving into two signals of a luminance signal Y and chrominance signals C. A data inserting circuit 200, after the circuit removes a digital signal except the still picture information included in the luminance signal Y, for example, in charge of the character information, etc., and the unnecessary signal which comes to be the cause of a noise, inserts and records a data signal showing the prescribed disk information, etc., to the luminance signal Y. Consequently, the disk information, etc., can be satisfactorily recorded together with the still picture information at the rotary recording media, and the arrangement of the contents of still picture information and the prevention of the viewing of the still picture information to the unspecified person can be easily executed.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a data recording method for a still image recording/reproducing device that records a composite video signal carrying still image information on a magnetic disk, and particularly relates to a data recording method for a still image recording/reproducing device that records a composite video signal carrying still image information on a magnetic disk, and in particular, it relates to a data recording system for a still image recording/reproducing device that records a composite video signal carrying still image information on a magnetic disk. The present invention relates to a data recording method for a still image recording and reproducing device that records data signals indicating such information.

[Background of the invention]

Recently, with the arrival of the new media era, various AV (
(audio/visual) products have been developed and put into practical use. Among these AV preparations, still image recording and reproducing devices that use magnetic recording media such as magnetic disks, which can repeatedly record and erase images and are inexpensive, have become widespread.

By the way, in a still image recording and reproducing device using a magnetic disk for -a, a composite video signal carrying image information of moving images and still images corresponding to a TV screen is transferred to a plurality of annular tracks formed on the magnetic disk. A method is adopted in which a still image is recorded at a predetermined position on one of the seven tracks.

As the amount of still image information increases, a large amount of magnetic disks are required to record the still image information. Therefore, it is necessary to provide a means for easily searching still image information recorded on these large volumes of magnetic disks.

Therefore, in the signal recording area of the magnetic disk, the still image information cannot be displayed on the screen unless the still image information and the serial number of the magnetic disk or a code known only to a specific person are verified. It is conceivable to record information etc. at the same time.

For example, from V 5ync in the vertical blanking period to 17H~1
The above data may be recorded in a horizontal scanning period of about 81-f (H is one horizontal scanning period). However, for example, in the composite video signal obtained based on the detection and demodulation of broadcast waves transmitted from current TV broadcasting stations, in addition to the image signal serving as still image information, there is a A digital signal (character signal) carrying character information etc. may be included within a horizontal scanning period of about 20H.

Therefore, when inserting a data signal indicating disc information etc. for the above purpose into such a composite video signal,
There is a problem in that the digital signal carrying character information and the data signal indicating disc information are recorded overlapping on the time axis.

In addition, regardless of the composite video signal transmitted from a TV broadcast station, the composite video signal obtained based on the ↑ island shadow from a video camera, etc. may contain unnecessary signals that cause noise. Therefore, there is a problem that disc information cannot be recorded properly.

[Purpose of the invention]

The present invention was made in view of these circumstances, and
It is an object of the present invention to provide a data recording system for a static recording/reproducing device that allows for easy organization of still image information recorded on a magnetic disk or for preventing unspecified persons from viewing the still image information.

[Summary of the invention]

In order to achieve the above object, the present invention provides a data recording method for a still image recording and reproducing device that records a video signal carrying image information on a magnetic disk. The present invention is characterized in that the signal carrying the data is removed, and a data signal indicating disk information of the magnetic disk is inserted and recorded into the signal from which the signal has been removed.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a data recording method of a still image recording/reproducing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a specific configuration of a still image recording and reproducing apparatus to which the present invention is applied. In the figure, the still image recording and reproducing apparatus mainly includes a Y/C signal separation circuit 100 and a data insertion circuit 200.
, a control circuit 300, an FM modulation circuit 400, 500, a mixing circuit 600, a recording preamplifier 700, a head position detection circuit 800, and a recording section 900.

The Y/C signal separation circuit 100 is a circuit that separates a composite video signal input via the video signal input terminal T1, obtained for example from TV broadcast reception, into two signals, a luminance signal Y and a color signal C, and is a data insertion circuit. Circuit 200 is signal separation circuit 1
Of the two signals separated by 00, after removing the digital signal carrying character information other than the still image information contained in the luminance signal Y and the unnecessary signal causing noise, this Control circuit 3, a circuit for inserting a data signal indicating predetermined disc information etc. into the luminance signal Y
00 operates the data insertion circuit 200 and the recording section 900 based on the horizontal synchronization signal and vertical synchronization signal of the luminance signal Y obtained from the signal separation circuit 100, and inserts a data signal such as disc information into the luminance signal Y. This is a circuit that performs control for recording a composite video signal or for recording a composite video signal. Furthermore, the control circuit 300 includes a data insertion circuit 200 and a recording section 9.
In addition to the control of 00, it also supervises the entire device, and performs, for example, manual control of a data key (not shown) for inputting disk information etc. to a magnetic disk. Then, the FM modulation circuit 400 converts the tumor signal Y into which a data signal such as disc information has been inserted by the data insertion circuit 200 into an FM modulation signal having a predetermined FM carrier frequency.
The circuit that converts to the R degree signal, the FM modulation circuit 500, is a Y/C
<=A circuit that converts the color signal C output from the bone separation circuit 100 into an FM color signal having a predetermined FMwL transmission frequency;
The mixing circuit 600 is a circuit that mixes two FM signals output from the FM modulation circuits 400 and 500, and the recording preamplifier 700 is an amplifier that sets the FM video signal output through the mixing circuit 600 to a predetermined signal level. It is. Further, the recording section 900 mainly includes a low reencoder 16, a stepping motor 17, a magnetic head 26, and a magnetic disk 28. This is a mechanism for controlling the stepping motor 17 and recording the FM video signal outputted from the recording preamplifier 700 by the magnetic head 26 onto a predetermined track of the magnetic disk 28. The head position detection circuit 900 detects the resistance value of the low reencoder 16, and the head position detection control circuit 300 indicates the position of the magnetic head 26 based on the resistance value.
This is a circuit that outputs to.

Next, an outline of the configuration of the data insertion circuit 200 shown in FIG. 1 will be described in FIG. 2. In the figure, a data insertion circuit 200 has a built-in clamp circuit 202 for setting the luminance signal (Y) 10 to the sync tip level.

Then, a circuit whose main part is a transistor TRI for inserting a data signal such as disc information into the luminance signal (Y) 10 and a circuit that allows insertion of a data signal such as disc information into the luminance signal (Y) 10 are provided. Transistor TR2 for
The circuit having the transistor TRI as the main part is made up of resistors R1, R2, R3, and R4, a variable resistor VRI, and capacitors C1, C2, and A resistor R1 and a capacitor C1 are connected in series to the base terminal of the transistor TRI.
is connected. A resistor R2 is connected between the base terminal and the collector terminal, and a capacitor C2 connected in parallel to the collector terminal and an intermediate terminal of a variable resistor VR1 whose one end is connected to the power supply line and the other end is grounded. The other end of the capacitor C2 is grounded. Resistors R3 and R4 are connected to the emitter terminal, of which the resistor R4 is connected to the FM modulation circuit 400 at the subsequent stage.

The circuit whose main part is the transistor TR2 includes a resistor R5,
It is composed of transistors R6 and R7, a variable resistor VR2, a capacitor C3, and an inverter 204, and a resistor R5 and an inverter 204 connected in series are connected to the base terminal of the transistor TR2. A capacitor C3 and an intermediate terminal of a variable resistor VR2 are connected to the collector terminal, and the other end of the capacitor C3 is grounded. Furthermore, resistors R6 and R7 are connected to both ends of the variable resistor VR2, and the other end of the resistor R6 is connected to the power supply line. The other end of the resistor 7 is grounded. The emitter terminal is connected to the emitter terminal of the transistor TRI via the aforementioned resistor R3, and is also connected to the output terminal of the clamp circuit 202.

Next, the operation of the still image recording and reproducing apparatus having the above configuration will be described with reference to FIG.

In FIG. 1, for example, a broadcast signal transmitted from a TV broadcast station is demodulated and then input via a video signal input terminal T1. The demodulated composite video signal is separated into a luminance signal Y and a chrominance signal C by a Y/C signal separation circuit 100, of which the luminance signal (Y) 10 is separated by a data insertion circuit 200 and a control circuit 30.
Output to 0. Thereby, the control circuit 300 always detects the vertical synchronization signal and horizontal synchronization signal of the luminance signal (Y) 10. Further, the luminance signal (Y) 10 inputted to the data insertion circuit 200 shown in FIG. 2 is set to a predetermined sync tip level by the clamp circuit 202. The control circuit 300 then outputs a luminance signal (
Y) From the time of detection of the trailing edge of the 10 vertical synchronizing signals (not shown), count the number of occurrences of the horizontal synchronizing signal, and when the count number is 16, that is, 16 horizontal scanning periods (H is one horizontal scanning period), the horizontal The time of the trailing edge of the synchronization signal [. At this point, a high level data enable signal 14 (FIG. 3(C)) is output to the inverter 204 of the data insertion circuit 200. As a result, the output side of the inverter 204 becomes low level, so the transistor TR,2 becomes ON state.
The luminance signal Y10 ((a) in the same figure) which is higher than the pedestal level set by the resistance value of the variable resistor VR2 is set to the pedestal level (relative amplitude is zero) ((b) in the same figure).

Further, the control circuit 300 outputs a data enable signal (FIG. 3(C)) based on the input operation of the data input key by the operator, and subsequently outputs the data to the base terminal of the transistor TRI of the data insertion circuit 200 shown in FIG. , - A data signal ((d) in the same figure) indicating disc information encoded with a maximum of 4 bits per horizontal scanning period, for example, at time t.
It is set to output as 1.

As a result, a signal is added to the luminance signal Y10 ((b) in the figure) applied to the emitter terminal of the transistor TRI in accordance with the data signal ((d) in the figure) input to the base terminal of the transistor TRI. Luminance signal (Y)1
8 ((e) in the same figure). Also, the species degree signal (Y) 1
8 ((e) in the same figure), the white level setting is done in advance by setting the variable resistor V.
This is done by adjusting the resistance value of RI.

The brightness signal (Y) 18 ((e) in the same figure) is connected to the resistor R4.
The signal is output to the subsequent FM modulation circuit 400 shown in FIG. As a result, the input luminance signal (Y) 18 (FIG. 6(e)) is converted into a predetermined FM luminance signal by the FM modulation circuit 400.

Furthermore, the color signal C subjected to signal separation in the Y/C signal separation circuit 100 described above is directly input to the FM modulation circuit 500 and converted into a predetermined FM color signal. and,
Two FM output from FM modulation circuit 400.500
The signals are mixed by a mixing circuit 600, and the FM composite video signal superimposed by the mixing is sent to a recording preamplifier 7.
The signal is output to the magnetic head 26 via 00. In addition, the control circuit 300 also controls the head position detection circuit 900 in advance.
The stepping motor 17 is controlled based on the head position detection signal output from the magnetic disk 28 to move the magnetic head 26 to a predetermined track on the magnetic disk 28 . As a result, the FM video signal is recorded by the magnetic head 26 on one predetermined track of the magnetic disk 28 corresponding to one screen.

Thereby, by performing predetermined signal processing on a data signal indicating disk information included in an FM composite video signal recorded on a magnetic disk, it becomes possible to display the result on a television screen together with still image information.

In addition, by converting the data signal into a specific code,
Still image information recorded on the magnetic disk can be made unviewable unless data verification is possible.

〔Effect of the invention〕

As explained above, in the data recording method of the still image recording and reproducing apparatus according to the present invention, a composite video signal is separated into a luminance signal and a color signal, and character information other than image information included in the luminance signal is The signal carrying the information is removed, and a data signal indicating the disk information of the magnetic disk is inserted into the luminance signal from which the signal has been removed and recorded, so that the magnetic disk contains still image information as well as still image information. It becomes possible to record disc information etc. in a good manner, thereby making it easy to organize the contents of the still image information and to prevent unspecified persons from viewing the still image information.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a specific configuration of a still image recording and reproducing apparatus to which the present invention is applied, FIG. 2 is a circuit diagram showing an example of the data insertion circuit shown in FIG. 1, and FIG. 2 is a timing chart for explaining the operation of the still image recording and reproducing apparatus shown in FIG. 1. FIG. 28... Magnetic disk, 100... Signal separation means,
200...Data insertion means, 300...Control means, 400.500...FM modulation circuit, 600
...Mixing circuit, 700...Recording preamplifier,
800...recording section, 900...head position detection circuit.

Claims (1)

[Claims] In a data recording method for a still image recording and reproducing device that records a video signal carrying image information on a magnetic disk, the signal carrying information such as character information other than the image information of the video signal is 1. A data recording method for a still image recording and reproducing apparatus, characterized in that a data signal indicating disk information of a magnetic disk, etc. is inserted into the signal from which the signal has been removed, and then recorded.