JPS62146467A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To refer stored contents at the time of recording and to skip a track generating a dropout to record efficiently images or the like by storing and displaying data indicating the dropout generating status of the track. CONSTITUTION:A control circuit 70 decides the existence of a dropout generated in a magnetic sheet 68 based on the detecting output of an envelope detecting circuit 86, stores the track No. of the track generating the dropout and the number of tracks on the sheet 68 or displays the stored contents in a display device 94. The track generating the dropout is skipped by referring the contents stored in the storage circuit of a circuit 70 at the time of recording, so that data such as image information to be recorded can be efficiently recorded in unrecorded tracks successively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an electronic still for recording signals indicating image information etc. on a rotating magnetic recording medium such as a magnetic disk or for reproducing signals recorded on the rotating magnetic recording medium. It relates to magnetic recording and reproducing devices such as cameras.

[Background of the invention]

In magnetic recording and reproducing devices such as VTRs, a reproducing circuit is usually provided with a dropout compensation circuit (hereinafter referred to as a DOC circuit) for compensating for dropouts that occur in a magnetic recording medium such as a magnetic disk. This dropout is a phenomenon that occurs when the video signal is missing during playback at a location where no recording was made due to a defect in the recording medium, etc.
The C circuit is a circuit that compensates by inserting a signal from the same part before the l line into the dropout part. This takes into consideration the fact that although the signals before and after one line are not considered to have exactly the same waveform, there is a line correlation in TV signals, so it can be compensated visually. .

By the way, in the case of a VTR, even if dropouts occur irregularly, the screen changes one after another on the TV screen during playback, so the point where the dropout occurs also flows irregularly on the screen, so the dropout Unless it occurs frequently, it usually disappears over time and the viewer does not notice it.

On the other hand, in magnetic recording and reproducing devices such as electronic still cameras, one field or one frame of image information is assigned to one track of a magnetic disk, which is a recording medium, to record a still image. Therefore, during reproduction, the same field (or frame) is repeatedly reproduced, so dropouts occur at the same position on the screen, and the dropouts become fixed pattern noise. Therefore, even if a DOC circuit is provided to perform dropout compensation as in the case of a VTR, the dropout will be noticeable to a normal viewer, which is an undesirable problem for a magnetic recording/reproducing apparatus that records still images.

Under these circumstances, recording media such as magnetic disks that record still images such as electronic still cameras are generally required to have extremely low dropouts.

On the other hand, dropouts also occur due to unevenness when applying a magnetic material during the production process of recording media such as magnetic disks, but products with dropouts are checked at the time of shipment and products with dropouts are removed.

Therefore, dropout that occurs after the product reaches the user becomes a problem. This dropout is caused by dust adhering to the recording surface of a recording medium, such as a magnetic disk, or by dust entering between the head and the magnetic disk installed in a magnetic recording/reproducing device and scratching the recording surface of the magnetic disk. It is caused by

New magnetic disks that have not been used often have fewer dropouts and less area, but older magnetic disks that have been used many times are likely to have an increased number of dropouts. If image recording is performed using such a magnetic disk with many dropouts, there is a problem in that the recording is wasted.

[Purpose of the invention]

The present invention was made in view of these circumstances,
It is an object of the present invention to provide a magnetic recording and reproducing device that can display the occurrence state of dropouts in a rotating magnetic recording medium such as a magnetic disk, and can skip over and over where dropouts occur during recording.

[Summary of the invention]

In order to achieve the above object, the present invention provides a magnetic recording and reproducing apparatus for recording signals indicating image information etc. on a rotating magnetic recording medium such as a magnetic disk, or for reproducing signals recorded on the rotating magnetic recording medium. A pseudo signal generating means for generating a pseudo signal for checking the presence or absence of dropouts in each track of the rotating magnetic recording medium, and a means for checking the recording state and presence or absence of dropouts in each track of the rotating magnetic recording medium. and a storage means for storing a track number of a track in which a dropout has occurred when the control means checks the presence or absence of a dropout on the rotating magnetic recording medium, and the control means is configured to control the rotating magnetic recording medium. The pseudo signal output from the pseudo signal generating means is recorded on the unrecorded tracks, and the tracks on which at least one pseudo signal is recorded are checked for the presence or absence of dropouts, and after the check is completed, This method is characterized in that the pseudo signal is once erased from all tracks on which the pseudo signal has been recorded.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the magnetic recording and reproducing apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the configuration of an electronic still camera as an embodiment of the magnetic recording/reproducing apparatus according to the present invention. In the figure, the imaging section of the electronic still camera mainly includes an ahocal lens 10, an aperture 12, a master lens 14, and a mirror 1.
6, shank 18 and solid-state image sensor (in this example, CO
a finder optical system 24 including a pentaprism 22 that guides the reflected light obtained via the mirror 16 to the finder;
A photometric optical system consisting of a condensing lens 26 and a light receiving element 28 that condense the reflected light from the subject that has been split by the master lens 14, and an aperture drive 'A' position 30 that drives the aperture 12.
, a mirror/shutter drive device that drives the mirror 16 and the shank 1B, an aperture drive device 30 and a mirror/shutter drive device that captures the output of the light receiving element 28 and adjusts the aperture value and shutter speed to appropriate values based on the output signals. 32, and an automatic exposure control circuit 34 that controls the exposure control circuit 32.

The mirror 16 is normally located at the position shown in the figure, but in the case of a layered type, it is flipped upward so that the reflected light 100 from the object is incident on the imaging surface of the solid-state image sensor 20. The solid-state image sensor 20 is a timing pulse generation circuit 3
The vertical drive circuit 3 receives the pulse signal output from the horizontal drive circuit 6 and is driven by the drive signal from the horizontal drive circuit 40.

The timing pulse generation circuit 36 is a circuit that generates various pulse signals for controlling each circuit section of the electronic still camera.

Further, although the solid-state image sensor 20 is omitted in the drawing, it actually includes a color filter.

On the other hand, the recording system circuit includes a preamplifier 4 that amplifies the color signals R, G, and B obtained from the solid-state image sensor 20 to a predetermined level.
2. Receive the control signal from the control circuit 70 and control each output signal R, G, B of the preamplifier to a predetermined level? 111, a process/matrix circuit 46 that takes in the output signal of the gain control amplifier 44 and creates the signal Y, color difference signals R-Y, BY, and color difference signals R-Y, BY. Line sequential circuit 4, pre-emphasis 50, 52, FM modulation circuit 54, 56, differential phase shift keying (DP) for recording photographic data according to a predetermined format S K) circuit 58
, a recording preamplifier 60, a head 62, and the like.

The magnetic recording head 62 is driven by a head drive motor 64 so as to be transported in the radial direction of the magnetic sheet 68.

The head drive motor 64 receives a rotation direction designation signal DR output from the control circuit 70 that designates the rotation direction of the head drive motor 64 and a track designation signal PS that moves the head 62 to a predetermined track on the magnetic sheet 68. The drive is controlled by a motor drive circuit 66 that outputs a drive signal. In the movement path of the magnetic recording head 62, there is a position detection sensor 72 at a position opposite to the original return position (home position) HP of the magnetic sheet 68, and a position detection sensor 74 at a position opposite to the end position EP of the magnetic sheet 68. These detection outputs are taken into the control circuit 70, and when the head 62 reaches these positions, the control circuit 70 performs predetermined control.

On the other hand, the magnetic seat rod 8 is detachably attached to a rotating shaft 73 driven by a spindle motor 75, and is connected to the spindle motor 75, a frequency generator (FC) 76, and a detection coil 7.
9. Steady rotation in a predetermined direction by the waveform shaping circuit 80, digital servo circuit 78, and motor drive amplifier 77. The spindle motor 75 is connected to the shirt release button 84
It is activated by the operation. That is, in this embodiment, the shirt release button 84 operates in two strokes, and in the first stroke, the switch SWI is closed and power is supplied to each part of the apparatus. As a result, the digital servo circuit 78 outputs a drive signal for driving the spindle motor 75 to the spindle motor 75 via the motor drive amplifier 77, and the acid motor 75 is started. Furthermore, in the second step of operating the shirt release button 84, the control circuit 70 controls the operations of each circuit section to perform shirt release, photographing, and recording. This configuration avoids wasting power from a power source such as a battery.

Further, 86 is an envelope detection circuit. The envelope detection circuit 86 takes in the reproduced FM signal, performs envelope detection on the FM signal, and outputs the detection output to the control circuit 70. The control circuit 70 is based on this envelope detection circuit 86.
Based on the detection output of the magnetic sheet 68, a track search of the magnetic sheet 68 or a determination as to whether or not a dropout has occurred in the magnetic sheet 68 is performed.

Furthermore, 91 is an alarm device, and this alarm device 91 is connected to the oscillator 8.
8 and an audible signal generator 90 such as a piezoelectric element, and the control circuit 70 is configured to control when an operation is performed to perform these operations when the conditions for photographing, recording, etc. are not established, or when each circuit is activated. A warning signal is output to an alarm device 90 in order to issue a warning to the photographer when an abnormal state occurs in the camera.

92 and 94 are a display drive circuit and a display device, respectively;
The display device 94 displays various types of information.

The display device 94 displays, for example, the track number on the magnetic sheet 68 where a dropout has occurred or the number of tracks where a dropout has occurred.

Furthermore, 96 is a dropout detection switch, and the dropout detection switch 96 instructs the photographer not to record data such as image information on the recording track of the magnetic sheet 68 when a dropout occurs in the recording track. This is a switch to give When the dropout detection switch 96 is operated, the control circuit 70 performs processing for checking the recording state of each track on the magnetic sheet 68 and the occurrence state of dropout based on a program to be described later.

In the pseudo signal generation circuit 130, the control circuit 70 is connected to the magnetic sheet 6.
This is a circuit that generates a pseudo signal to be recorded on each track when determining the presence or absence of dropout in each track of 8, and the pseudo signal that is the output signal of the pseudo signal generation circuit 130 is a control circuit output from the control circuit 70. The signal is sent to the magnetic recording head 62 via the gate circuit 102.

In addition, a control circuit 70 is connected to one input terminal of the AND gate 98.
A permission signal 112 for permitting the strobe tuning signal to be outputted to the outside is inputted, and a strobe tuning signal 110 is inputted from the shutter 18 to the other input terminal of the AND gate 98. It has become. If the AND condition of the AND gate 98 is satisfied, a strobe tuning signal is output from the terminal 114 to the outside.

Further, from the terminal 116, a strobe charge completion signal indicating that charging of the charging capacitor built into the strobe is completed is inputted to the control circuit 70.

Further, the field light is condensed by a condenser lens 118, further diffused by a diffuser plate 120, and then incident on a white balance sensor 122. White balance sensor 122
outputs a signal corresponding to the brightness of incident light to an auto white balance (AWB) discrimination circuit 124. The auto white balance determination circuit 124 is the white balance sensor 1
Based on the signal inputted by 22, it is determined whether the field light is daylight or not, and the determination signal is output to the control circuit 70.

The control circuit 70 is constituted by a microcomputer or the like, and includes a storage circuit in which the track number, number of tracks, etc. in which dropout has occurred on the magnetic sheet are stored.

Next, the contents of the drip/boot check routine executed by the control circuit 70 are shown in FIG. In the figure, when the program is started, the magnetic sheet 6 is inserted into the stethoscope 200.
It is determined whether or not the magnetic sheet bank in which 8 is incorporated is attached to a predetermined position of the electronic still camera, and if the magnetic seat back is not yet attached, the same determination is repeated. When the magnetic seat back is installed in a predetermined position, it is determined in step 201 whether or not the dropout detection switch 96 has been operated. If it is determined in step 201 that the dropout detection switch 96 has not been operated, the process advances to step 210 and a recording operation is performed.

That is, tracks on which data has already been recorded are skipped, data such as image information is sequentially recorded on unrecorded tracks, and the execution of this routine is completed.

Note that the recording operation in step 210 is specifically as follows. For example, when recording as is with a recording device, the track in which a dropout has occurred is skipped by referring to the stored contents of the memory circuit provided in the control circuit 70, and the image information to be recorded, etc. is sequentially recorded on unrecorded tracks. data is recorded. Although this embodiment describes a recording device, when checking the presence or absence of dropouts in a playback device, data indicating the state of occurrence of dropouts is stored in predetermined tracks of the magnetic sheet 68 (for example, tracks where dropouts have occurred). Record the track number and number of tracks). When recording data such as image information on another recording device using a magnetic sheet on which data indicating the state of occurrence of dropout is recorded, the state of occurrence of dropout described above recorded on the magnetic sheet is recorded. By reading data indicating this with a recording device, it is possible to easily skip a track where a dropout has occurred.

On the other hand, in step 201, the dropout detection switch 96
If it is determined that the magnetic recording head 62 has been operated, the process proceeds to step 202, in which the magnetic recording head 62 is moved to the first track of the magnetic sheet 68, and the next step 2 is performed.
Proceed to 03. In step 203, it is determined whether or not a signal indicating image information etc. is recorded on the track on the magnetic sheet 68. If it is determined that a signal is recorded on the track, dropout is performed on the corresponding track in step 204. A determination is made as to whether or not this has occurred. Here, the presence or absence of dropout is determined based on the detection output of the envelope detection circuit 86. That is, if the level of the detection output of the envelope detection circuit 86 is below a predetermined value, it is determined that dropout has occurred.

If it is determined in step 204 that a dropout has occurred in the corresponding track, the track number N in which a dropout has occurred is stored in a storage circuit in the control circuit 70 in step 205, and the process proceeds to step 206. Furthermore, if it is determined in step 204 that dropout has not occurred, the process similarly proceeds to step 206, and step 2
At step 06, it is determined whether the track on which the magnetic recording head 62 is currently positioned is the 50th track.

On the other hand, if it is determined in step 203 that no signal is recorded on the track, the process proceeds to step 211, and in step 211, the pseudo signal output from the pseudo signal generation circuit 130 is transferred to the corresponding track via the gate circuit 102 and the head 62. is recorded in step 211 in the next step 212.
In step 204, the pseudo signal is reproduced from the track on which the pseudo signal was recorded, and the presence or absence of dropout is determined based on the detection output of the envelope detection circuit 86, as in step 204. If it is determined in step 212 that dropout has occurred, step 205
, and the same processing as described above is performed. Further, if it is determined in step 212 that dropout has not occurred, the process advances to step 213;
In step 206, the pseudo signal recorded on the current track is erased.

If it is determined in step 206 that the track on which the magnetic recording head 62 is currently located is not the 50th track, the process proceeds to step 214, in which the magnetic recording head 62 is moved to the next track, Returning to step 203, the same processing as described above is performed.

On the other hand, if it is determined in step 206 that the track on which the magnetic recording head 62 is currently positioned is the 50th track, the process advances to step 207. Step 207
Then, the display output to the display device 94 is temporarily stopped, and in step 208 the magnetic recording head 62 is moved to the first track.

In step 209, when the magnetic recording head 62 has moved to the first track, the control circuit 70 sends the display drive circuit 92 to the display drive circuit 92.
Data indicating the track number in which a dropout has occurred and the number of tracks in which a dropout has occurred are output to the display device 94 via the display device 94, and these data are displayed on the display screen of the display device 94, and the execution of this routine is completed. do.

In this way, according to this embodiment, the state of occurrence of dropouts in each track of the magnetic sheet can be known from the display screen of the display device prior to recording, and therefore it is easy to determine whether or not the magnetic sheet back can be used. be able to. Additionally, tracks where dropouts have occurred can be automatically skipped during recording, and data can be reliably recorded on tracks where dropouts have not occurred.

〔Effect of the invention〕

As explained above, in the magnetic recording/reproducing apparatus of the present invention, prior to the recording operation, the control means sequentially checks whether or not there is a dropout in each track of the rotating recording medium, and the storage means records the occurrence of dropout. According to the present invention, the present invention is configured to store data indicating the occurrence of dropouts and to display data indicating the occurrence state of dropouts on the display means when the check for the presence or absence of dropouts is completed. It is possible to reliably grasp the state of occurrence of dropouts prior to recording, and when recording, by referring to the stored contents of the storage means and automatically skipping tracks where dropouts have occurred, good images, etc. can be obtained. It becomes possible to record.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a magnetic recording apparatus according to the present invention, and FIG. 2 is a flowchart showing the contents of a dropout check routine executed by the control circuit in FIG. 62... Magnetic recording head, 68... Magnetic sheet,
70... system? IO circuit, 75... Spindle motor, 86... Envelope detection circuit, 92... Display drive circuit, 94... Display device, 96... Dropout detection switch, 130... Pseudo signal generation circuit .

Claims (3)

[Claims] (1) In a magnetic recording and reproducing device that records signals indicating image information, etc. on a rotating magnetic recording medium such as a magnetic disk, or reproduces signals recorded on the rotating magnetic recording medium, each track of the rotating magnetic recording medium is provided. a pseudo signal generating means for generating a pseudo signal for checking the presence or absence of dropouts in the rotating magnetic recording medium; a control means for checking the recording state of each track of the rotating magnetic recording medium and the presence or absence of dropouts; a storage means for storing a track number of a track where a dropout has occurred when checking the presence or absence of a dropout in the magnetic recording medium; The pseudo signal output from the signal generating means is recorded, and at least the tracks on which the pseudo signal is recorded are checked for the presence or absence of dropouts, and after the check is completed, the pseudo signal is once recorded on all tracks recorded. A magnetic recording/reproducing device characterized by erasing pseudo signals. (2) The control means checks whether there is a dropout on both already recorded tracks and unrecorded tracks.
) The magnetic recording and reproducing device described in item 1. (3) It has a display means for performing various displays, and the control means reads data indicating the occurrence state of dropout from the storage means when the check for the presence or absence of dropout is completed, and displays the data on the display. A magnetic recording/reproducing apparatus according to claim 1 or 2, wherein the magnetic recording and reproducing apparatus outputs the information to a means.