JPS58182974A - Magnetic recorder of still picture information - Google Patents

Abstract

PURPOSE:To simplify the circuit constitution and to attain high density recording, by providing a guard band of a suitable width only between a couple of recording tracks and other couple of recording tracks on which the still picture information for other screen's share is recorded. CONSTITUTION:A picture output signal of a signal processing circuit 2 including an AGC circuit, a noise rejection LPF, and a preemphasis circuit for high frequency component intensity is FM-modulated 3, records and amplified 4 and applied to video heads 5a, 5b. The heads 5a, 5b form a couple of recording tracks 7a, 7b adjacent with the guard band system and a guard band 8 having a comparative narrow width is provided between the tracks 7a and 7b. Picture signals of odd and even number fields for one screen's share are recorded on the tracks 7a and 7b. The location of the horizontal synchronizing signals 9 of the tracks 7a, 7b is arranged so as to be consecutive and the azimuth angle of them is taken as the opposite tilted azimuth recording.

Description

[Detailed Description of the Invention] Regarding this magnetic recording device for still image information,
In particular, the present invention relates to a magnetic recording device that records still image information on a disk-shaped magnetic recording medium with two tracks per screen.

In conventional magnetic recording devices of this kind, image signals for one field or one frame are recorded in one trunk on a disc-shaped magnetic recording medium (hereinafter referred to as a magnetic disk), and a guard band is placed between tracks. It is set up. When recording one frame of a television signal or an image signal obtained by one image sensor on a magnetic disk using a conventional device having one video head, one frame of the image signal is recorded on a magnetic disk. It is easy to record one field on one track, but when recording one field corresponding to one track, two fields' worth of signals are generated in chronological order. Considering the travel time of the head between tracks, a memory circuit or a delay circuit is required.

Furthermore, in order to perform high-density recording with high resolution, two image sensors are used to photograph the 1i1j sky, and the output image signals for two channels are recorded with one track per channel. from the image sensor
Since image signals corresponding to frames are output simultaneously or in time series, a storage circuit or a delay circuit is required in this case as well, as described above.

This invention does not use the above-mentioned memory circuit, delay circuit, etc.
The main object of the present invention is to provide a magnetic recording device for still image information that can record one frame's worth of image signals on one track per field or two channels' worth of image signals on one track per channel in real time. The purpose is Another object of the present invention is to simplify the circuit configuration and to enable even higher density recording.

In order to achieve such an object, the still image information magnetic recording apparatus of the present invention aligns the horizontal synchronizing signal positions of a pair of image signals constituting one screen's worth of still image information and performs the above-mentioned ii* In addition to providing correlation between the signals, a pair of IJI signals are recorded on a disc-shaped magnetic recording medium using a pair of adjacent recording tracks by a tilted azimuth method in parallel or in the track length direction. It is equipped with a pair of video heads arranged in a staggered manner.
A guard band of an appropriate width is provided between the pair of recording tracks in which still image information for one screen is recorded and another pair of recording tracks in which still image information for one screen is recorded. In this case, a guard band is not provided at the junction between a pair of adjacent recording tracks, or even if a guard band is provided, the guard band is limited to a width narrower than the above-mentioned width. If the still and still image information for one screen is for one frame of a television video signal or an image signal from an image sensor, the pair of image signals is the image signal of the odd field of the frame and the image signal of the even field. There are 6 pairs of field ms scratch signals, and the image line signals of both fields are arranged in H order and output by a pair of video heads.
Magnetic recording is performed on a pair of adjacent recording tractors using the inclined azimuth recording method.

With this, it is possible to record in real time the image signals of both fields that appear in time series without requiring any mechanical movement of the head, and moreover, it is possible to achieve high-density recording using the inclined azimuth recording method.

For example, if you use two normal single-screen image sensors and make their two imaging surfaces correspond to the 1j plane to obtain one high-resolution still image, one frame of each image sensor The pair of image signals for one frame is the pair of image signals for one screen. Therefore, in this case, the image signals for one frame of both emotional elements are arranged in H order to form a pair of video signals. The head magnetically records the image signals on a pair of adjacent recording tracks using the inclined azimuth recording method, and the image signals for each frame are output simultaneously or chronologically from each sensor. This makes it possible to record in real time on a pair of tracks on a magnetic disk.

In this way, according to the magnetic recording V& It is also possible to improve recording density.

To further explain this invention in detail with reference to drawings showing practical examples, FIG. It is assumed that an image signal for one screen of image information is input. The signal processing circuit (2) includes a GC circuit that adjusts the level of this input image signal, a low-pass filter for noise removal, a pre-emphasis circuit that enhances high-frequency components, a 2-channel circuit that fixes the sync tip potential, and It includes clip circuits such as white clip and dark clip, and the image signal that has been properly processed by these circuits is F
The FM modulation output is supplied to the M modulation circuit (3), and is further transmitted to each video head (5a) (5a) via the FM modulation output recording amplifier (4).
b). In the illustrated example, both heads (5m) (5b) t1 are juxtaposed, and these heads (5m) (5b) drive the magnetic disk (
6) Tracking is performed to form a recording track as shown in Figure 2 (a) or (b) on the silver plate.

In other words, in the irises 2 (,), the head (5&) (5b)
A pair of adjacent recording tracks (7m) (7b) is formed using the guard panless method, and in Fig. 2 (b), a relatively narrow guard is formed between these pair of recording tracks (7m) (7b). An image signal for one screen is recorded on this pair of recording tracks (7m) (7b), and in particular, in this embodiment, an odd number field is recorded on the -power track (71). The image signal of the even field is recorded separately on the other track (7b), and the image signal of the even field is recorded separately on the other track (7b).
The positions of the horizontal synchronizing signals (9) are arranged in the HM pattern so that they are continuous, and the azimuth angles are recorded in opposite directions. Figure 2 (
a) In (b), (7'a) and (7'b) are another pair of recording tracks for one screen, and a guard band (2) of an appropriate width is provided between the pair of recording tracks. is,
The width of the narrow guard band (8) in FIG. 2(b) is narrower than that of the guard band (g). In order to increase the recording density, it is desirable to record without providing any guard bands between all recording tracks, but in that case, recording tracks (7 m ) (7
In order to prevent discontinuity of the playback screen due to synchronization signal disturbance due to crosstalk between the pair b) and the pair (7'a) and (7'b), between these pairs, i.e. It is also necessary to perform HM verification between tracks (7b) and (7'a). However, in the present invention, two video heads (
5m) (5b) are placed side by side in advance at the recording track position before recording.
(5b) are placed in advance at the recording track position before recording so as to be shifted in the track length direction, and are recorded chronologically by electrical switching. In the case where pairs of recording tracks for one screen are recorded adjacently to each other, in the present invention, tracks (7
m) After recording (7b), track (7'a)
.

When recording (7'b), the previous track (7a)
If the reproduction of (7b) is not performed simultaneously by providing another head and recording together with the synchronization signal of the reproduction signal of the previous track, H arrangement will not be possible, so such a separate reproduction head is not necessary. In terms of meaning as well, it is a good idea to record by providing a guard band (G) between track pairs of different screens. Also, the guard band (8) between the paired recording tracks (7a) and (7b) is used to remove black talk that cannot be completely eliminated by using azimuth loss alone due to poor head tracking during playback. A relatively narrow width is sufficient.

In Figure 1, both heads (5m) (5b) are juxtaposed at the recording track position.
) Recording amplifier (4) and each head (5aX5b) to alternately supply image signals for one field to (5b)
A switching circuit (11a011b) for switching the supply of the FM modulated output signal to the head is provided between the
Each switching circuit (11m) (11b) is configured to sequentially perform switching operations by a switching controller (2) based on a horizontal or vertical synchronizing signal of an image signal extracted by a synchronizing extraction circuit (6). Therefore, both heads (5a) csb) ti x switching circuit - (1
According to the operation of 1m) (11b), the FM modulation output signal is sequentially recorded on the magnetic disk (6), and each pair of tracks (7m) (7b) has 1 field worth of llii surface. Still image information will be recorded.

In the example shown in Figure lI41, both heads (5m) (5b) are placed side by side at the recording position, but in order to avoid the problem of crosstalk that occurs when the distance between the two heads is small, both heads (5m) (5b) are placed horizontally. They may be arranged by being shifted by a small distance in the track length direction by a known time before and after the cycle, and the point is determined by the relative design specifications with respect to the playback side. However, in this case, in order to arrange H between two tracks forming a pair, a delay circuit corresponding to a known time is required, but this is a sufficiently short time compared to the time required for mechanical track switching, and is a simple method. Realized by circuit.

Figure 6 shows high resolution g/1 in combination with the magnetic recording device of this invention.
FIG. 4 is a block diagram showing an example of a shooting aS suitable for photographing and recording still image damage information of degrees, and FIG. 4 is a schematic diagram showing the relationship between the imaging surface of the image sensor and the screen in this case. That is, in the imaging section of this example, the image of the subject α4 is sent to two imaging devices (18m) (18b) such as COD via an optical system such as a lens (b), a half mirror (to), and a mirror stem.
The images are formed so as to be shifted from each other by half the horizontal pitch width of the pixels, and both image sensors (18a818b)
The output of each image sensor is controlled by the drive circuit (to), or mixed by the mixing circuit (2), so that a screen in which the pixels of each image sensor appear alternately as shown in Fig. 4 is obtained. Processing is performed to obtain a high-resolution screen.

In Figures 1 and 3, (2) is a synchronization signal generator, which serves as a reference for all synchronization of the circuit. Each image sensor (18a
The output of A synchronization signal is added at - and the video output is made.

This video output is input to the input terminal (1) in FIG. 1, and as described above, each field is sequentially recorded on the recording tracks (7a) and (7b).

In the example of Fig. 6, there are two image sensors (18a
) is synthesized into an image signal for one screen (2) as shown in FIG. 4, and the frequency band in this case is about twice that of the case with one image sensor.

In FIG. 4, the circles correspond to the pixels of the image sensor (18m), and the triangles correspond to the pixels of the image sensor (18b).

FIG. 5 is a block diagram showing another example of a suitable image pickup unit. In this example, as shown in FIG. By doing so, the number of pixels is essentially doubled and the resolution is improved.

In the examples in Figure 95 and Figure 6, the same symbols as in Figure 3 indicate the same things, and (23m) and (23b) represent two-channel image signals corresponding to each image sensor (18m) and (18b). A process circuit similar to the above for (24
m) (24b) is a synchronizing signal adding circuit that applies a synchronizing signal to the image signal of each channel, and the output of each channel appears separately at terminals (25m) and (25b). The terminal (25m) has an image sensor (18m)
) appears, and an image signal from the image sensor (18b) appears at the terminal (25b), and depending on the readout control method by the circuit (2) for both image signals, the image signals are output simultaneously or sequentially. I can put it out. Therefore, to each of these terminals (25m) (25b), a distribution circuit system consisting of a signal processing circuit, an FM modulation circuit, and a Kishu amplifier similar to that shown in Figure 1 is connected to create two systems. , both recording amplifiers supply ii* signals to both video heads, respectively, and both image pickup elements (18 m
) (18b) can be recorded simultaneously or sequentially on the paired recording tracks (7m) (7b), in which case the image signals from one image sensor (18m) can be recorded on one track (7a). image signal of the other track σb
) are used to record image signals from the other image sensor (18b), respectively.

In the above example, the case of black and white signal processing has been described to simplify the explanation, but in the case of color signals, a color signal separation circuit, a color signal processing circuit, an NT80
It is only necessary to add an encoder circuit or the like to convert the signal into a standard television signal, and there is no essential change.

In addition, the signal obtained from the image sensor equipped with a color separation filter is separated into a luminance signal and a color difference signal by a separation circuit.
Alternatively, it is also possible to separate the G signal and RB flaw signal and record signals that require a wide band, such as the luminance signal and G signal, on one track, and the color difference signal and RB multiplexed signal on the other track. .

As described above, the present invention requires a delay circuit and a memory circuit to generate a 2-field signal or a 27-frame signal of one screen's worth of still image scratch signals that are output simultaneously or alternately in chronological order. It is now possible to record on two paired recording tracks on a magnetic disk in real time without any trouble, and the tilted azimuth recording method provides high recording density.
For the i side, a guard panless method can be used to further improve the recording density, and for other screens, an L guard band can be provided to prevent crosstalk.
ii) It has the advantage of being useful as a magnetic recording device for personal information.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the main part showing an example of the present invention, Fig. 2 (&) (b) is a schematic diagram partially showing the recording pattern on the magnetic disk according to the invention, and Fig. Block diagram showing an example of a sentimental part as an application example of the invention, No. 4
The figure is a schematic diagram showing the relationship between the image sensor and the screen in both figures.
The figure is a block diagram showing an example of a sentimental section as another application example, and FIG. 6 is a schematic diagram showing the relationship between the image pickup device and the screen in both figures. (1): Input terminal, (2): Signal processing circuit, (3):
FM modulation circuit, (4): Recording amplifier, (5m) (
5b): Video head, (6): Magnetic disk, (7a
X7b): recording track, (8): narrow guard band,
(9): Horizontal synchronization signal, (G): Guard band, (N
aX11b) Niswitching circuit, (6): Synchronization extraction circuit, (to): Switching controller, α◆: Subject, (2): Lens, (2): Half mirror, (Foundation):
Mirror, (18aX18b): Image sensor, (To): Drive circuit, (20aX20b): Amplifier, (2): Mixing circuit, @: Synchronization signal generation circuit, (23m) (23b):
Process circuit, H (24aX24b): Synchronous signal addition circuit, (25m) (25b): Output increaser, (2) @: Screen. Agent Patent Attorney Sanro Kimura

Claims (6)

[Claims] (1) By aligning the horizontal synchronization signal positions of a pair of image signals constituting one screen's worth of still image information. A pair of video heads arranged side by side or staggered in the track length direction are provided, each of which records data on a disc-shaped magnetic recording medium with a pair of adjacent recording tracks by an inclined azimuth recording method, and still image information for Iij planes is recorded. A guard band is provided between a pair of recording tracks to be recorded and another pair of recording tracks to which still image information for one screen is recorded, and a guard band is provided between the pair of adjacent recording tracks. A stationary IIi personal information information recording device, characterized in that a separate guard band narrower than the band is provided. (2) Align the horizontal synchronization signal positions of a pair of image signals constituting one screen's worth of still image information, create a correlation between the image signals by H arrangement, and combine the pair of image signals into a pair of 1119 alignments. A pair of video heads are arranged on a disc-shaped magnetic recording medium with recording tracks arranged side by side or offset in the track length direction by 2 fIk using an inclined azimuth recording method, and a pair of video heads capable of recording still image information for Igiii planes is provided. A guard band is provided between the recording track and another pair of recording tracks on which still image information for one screen is recorded, and a guard bandless system is used between the pair of adjacent recording tracks. A magnetic recording device for still image information, characterized in that: (3) 2:1 (interlace format) Odd-numbered fields of the image signal for one frame are recorded on one of a pair of recording tracks, and even-numbered fields are recorded on one of a pair of recording trunks. A magnetic recording device according to claim 1 or 2, wherein the magnetic recording device records on the other side. (4) Out of the image signals obtained by photographing one screen with two image sensors, the image signal from one image sensor is recorded on one of a pair of recording tracks, and both image signals from the other image sensor are recorded. 3. The magnetic recording device according to claim 1, wherein the magnetic recording device records the information on the other of a pair of recording tracks. (5) The still image signal according to claim 1 or #12, wherein one of the pair of image signals is a luminance signal and the other is a color difference signal.
a magnetic recording device for signals. (6) The still image signal 1ii according to claim 1 or 2, wherein one of the pair of image signals is a tiG signal, and the other is a multiplexed signal of TIG signal and B signal.
Magnetic recording device for i-signal.