JPH0879694A - Relative velocity variable magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE: To provide a relative velocity variable magnetic recording and reproducing device capable of magnetically recording and reproducing the image of a high quality picture element even at the time of a drum of a small diameter and recording and reproducing image information of plural kinds of relatively different images. CONSTITUTION: In order to temporarily record image information stored in a memory 1 with a recording format previously set corresponding to the number of the picture elements, a system controller 4 controls a magnetic recording and reproducing processing part 6 and controls a magnetic recording and reproducing mechanical deck 8 through a servo mechanism part 7 to make image information subjected to FM modulation with a central carrier, etc., characteristic to a selected format and to magnetically record image information subjected to FM modulation at a relative velocity characteristic to the selected format. On the other hand, at the time of reproducing, divided and recorded image information is assembled to be expressed on a single screen and is displayed at a display monitor part 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a reproducing apparatus and is particularly useful when recording / reproducing a plurality of types of image information having different relative image quality.

[0002]

2. Description of the Related Art Signals used in conventional general-purpose home VTRs, video cameras, etc. conform to NTSC television signals, and the number of scanning lines is 525.

[0003]

In the prior art as described above, the image quality is determined based on the number of scanning lines.
That is, for example, even if an image pickup device having a larger number of pixels than the conventional one is used, improvement in image quality cannot be expected so far unless the overall specifications of the recording system are changed.

On the other hand, in recent years, there has been a strong demand for magnetically recording a screen having a higher image quality than a reproduction screen of television broadcasting. For example, in a video tape recorder (VTR), when trying to magnetically record a high pixel screen of 1024 vertical and horizontal, for example, a TV system with 525 scanning lines cannot record, and the recently developed scanning line is 1125.
Book of high definition television (HDTV) systems are needed.

However, the HDTV system is bulky and costs too much. Furthermore, if the number of scanning lines is 1125 or more, it cannot be recorded even in the HDTV system.

Considering recording using a rotary drum such as a VTR, 8.06 MHz is required to obtain a resolution of 1024 dots with a horizontal scanning line of 1H = 15.75 KHz. In order to secure the band of 8.06 MHz, the recording wavelength is 0.7 μm and the frequency of the carrier is 10 MHz in FM recording.
If set to z, a relative speed of 7 m / sec is required.

On the other hand, one vertical scanning period (1V) is 1/15
In order to perform seamless recording as (sec), half-rotation is 1/15 (sec) with the two-head drum, so the drum rotation speed is 450 rpm. Therefore, the diameter of the drum in this case is 29.5 cm, which is too large to be put to practical use.

Further, even if a magnetic recording / reproducing apparatus devised so that a high-pixel screen can be magnetically recorded by a practical drum having a small diameter, this magnetic recording / reproducing apparatus
When recording image information that is relatively inferior in image quality, for example, compliant with NTSC TV broadcasting, a magnetic tape, which is a recording medium, has an unrecorded space,
There is a problem that the recording space of this magnetic tape cannot be effectively used. The relative speed between the drum and the magnetic tape when magnetically recording image information without creating a gap between tracks on the magnetic tape depends on the image quality of the image information, that is, the number of pixels. If the magnetic recording / reproducing apparatus described above is used as it is for a low image quality, the relative speed between the drum and the magnetic tape becomes too high.

For this reason, in the prior art, in order to achieve rational recording in which no space is left on the magnetic tape, it is ultimately necessary to individually prepare a magnetic recording / reproducing device according to the image quality.

In view of the above-mentioned prior art, the present invention can magnetically record / reproduce a high-pixel screen even with a drum having a small diameter, and can record / reproduce plural kinds of image information having different relative image qualities by one unit. An object is to provide a magnetic recording / reproducing apparatus with variable relative speed.

[0011]

[Means for Solving the Problems] First to achieve the above object
According to another aspect of the invention, storage means for temporarily storing the image information sent from the image information supply source, reading the image information and sending it to the magnetic recording system, and a modulation signal obtained by modulating the image information sent by the storage means. And a magnetic recording system for magnetically recording on a recording medium together with a pilot signal synchronized with this modulation signal, and the relative speed between the magnetic head and the recording medium at the time of recording is set high with the increase in the number of pixels of the image information. One of a plurality of formats that are individually predetermined according to the number of pixels for which a large number of screen divisions are set per image is selected, and an image is displayed under a modulation condition and relative speed specific to the number of pixels. It is characterized by comprising the above-mentioned storage means and control means for controlling the magnetic recording system so that information is divided and recorded on a plurality of tracks of the recording medium.

The second invention is a reproducing apparatus for a signal recorded by the relative velocity variable magnetic recording apparatus according to the first invention, which magnetically reproduces the image information recorded on the recording medium. And the number of pixels of the reproduction signal is detected based on the pilot signal extracted from the reproduction signal of the signal recorded on the recording medium, and the magnetic reproduction system is controlled to reproduce the image information in a format specific to this number of pixels. At the same time, it is characterized by having a control means for controlling the display means so that the reproduced signal is assembled into one image and displayed by the display means.

[0013]

According to the first aspect of the present invention, the image information is
Recording is performed by dividing the recording medium into a plurality of tracks based on the recording format such as the division number and the relative speed between the drum and the magnetic tape which are individually selected in advance according to the image quality.

According to the second aspect of the invention, the image information divided and recorded on a plurality of tracks is assembled as one piece of image information on the basis of the above-mentioned recording format, whereby one reproduction screen is reproduced on the display means.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. As shown in the figure, the memory 1 reads and stores image information, which is digital information sent from an image information supply source, under the control of a clock signal together with the address information of each pixel.

The capacity of the memory 1 at this time is selected so that all the pixels of the image information of the highest image quality can be stored. The image information to be recorded in this embodiment is 480 × 48.
0 dots (hereinafter referred to as first image information), 1024 × 1
024 dots (hereinafter referred to as second image information) and 204
8 × 2048 dots (hereinafter referred to as the third image information) 3
Since it is a type, it is selected based on the number of pixels of the third image information. FIG. 2 conceptually shows the memory space at this time.
Is.

The image information supply source may be an image pickup device of a video camera, a scanner, or the like.

The memory controller 2 controls reading of image information into the memory 1 based on a clock signal in the image information. This memory controller 2 is
The clock signal in the image information may be directly supplied to the memory 1 depending on the configuration of the memory 1, not necessarily provided independently.

The operation panel 3 is provided with operation switches for selecting various functions of the apparatus, that is, a recording switch for selecting a recording mode and a reproduction switch for selecting a reproduction mode. A mode signal indicating the mode selected by each operation switch is sent to the system controller 4.

The system controller 4 is composed of a microcomputer and is responsible for overall control of the device. That is, this system controller 4
Controls the magnetic recording / reproducing system 5 as well as the memory 1.

Particularly, at the time of recording, it is discriminated which one of the first to third image information is based on the capacity of the image information stored in the memory 1, and the magnetic information is recorded in accordance with the format corresponding to the discriminated image information. The recording / reproducing processing unit 6 performs predetermined signal processing, and controls the magnetic recording / reproducing mechanical deck 8 via the servo mechanism unit 7 so as to perform magnetic recording at a recording speed corresponding to the format.

The magnetic recording / reproducing system 5 includes a magnetic recording / reproducing processing unit 6, a servo mechanism unit 7, a magnetic recording / reproducing mechanical deck 8, a D / A / A / D converter 9, and a pilot signal oscillator 1.
0, a recording / reproducing amplifier 11, a low-pass filter 12, and a speed discriminating circuit 13.

The magnetic recording / playback processing unit 6 is configured to display D / A / A /
The output analog signal obtained by D / A conversion by the D converter 9 is F
The magnetic head of the magnetic recording / reproducing mechanical deck 8 is passed through the recording / reproducing amplifier 11 through the recording / reproducing amplifier 11 so that the M-modulated pilot signal sent from the pilot signal oscillator 10 is multiplexed and recorded as a low frequency signal. On the other hand, it is a part for performing predetermined signal processing such as demodulating the FM signal read via the magnetic head of the magnetic recording / reproducing mechanical deck 8.

The magnetic recording / reproducing mechanical deck 8 is composed of a rotary drum to which a magnetic head is attached, a tape drive system such as a capstan roll, a mechanism portion for ejecting and loading the magnetic tape, and the like for driving the rotary drum motor. The unit is controlled by the servo mechanism unit 7 so as to rotate at a predetermined rotation speed.

Further, the magnetic recording / reproducing processing section 6 and the magnetic recording / reproducing mechanical deck 8 are constructed so that signal processing and operation at the time of recording in them will be as follows.

That is, the magnetic recording / reproducing processing unit 6 is predetermined according to the number of pixels of the image information, based on the information indicating which of the first to third image information is discriminated by the system controller 4. In order to perform FM modulation in a certain format, the center carrier frequency, band characteristic, etc. are selected and predetermined signal processing is performed.

In this embodiment, three types of image information having different numbers of pixels are recorded, so that the first
-It has the 1st-3rd format corresponding to the 3rd image information.

Similarly, the magnetic recording / reproducing mechanical deck 8 is
Based on the information indicating which of the first to third image information is discriminated by the system controller 4, the servo is maintained so as to maintain the relative speed between the drum and the magnetic tape which is individually set in advance corresponding to each image information. A drive unit such as a drum is controlled by the mechanical unit 7, and the output signal of the magnetic recording / reproduction processing unit 6 supplied to the magnetic head via the recording / reproducing amplifier 11 is magnetically recorded.

3A to 3C conceptually show the first to third formats. The first format is for recording the first image information, and the central carrier of the FM is 5 MHz as shown in FIG. Also,
The drum rotation speed is 1800 rpm, and the recording speed is 30 sheets / second. Therefore, the image information in this case is divided into two and recorded over two tracks of the magnetic tape.

Similarly, the second format is for recording the second image information, and the central carrier of the FM is 10 MHz as shown in FIG. 3 (b). The drum rotation speed is 3600 rpm and the recording speed is 15 sheets / second. Therefore, the image information in this case is divided into eight and recorded over eight tracks of the magnetic tape.

The third format is for recording the third image information, and as shown in FIG.
The center carrier of is 20MHz. The drum rotation speed is 7200 rpm and the recording speed is 7.5 sheets / second. Therefore, the image information in this case is divided into 32 pieces and recorded over 32 tracks of the magnetic tape.

Thus, even if the format is changed, the first to third image information can be recorded by the tracks having the same width.

Further, since one piece of image information is divided according to the image quality (number of pixels), data indicating which part of the recording signal is recorded is recorded for each track simultaneously with FM magnetic recording. Further, the pilot signal can be preferably composed of, for example, a sine wave of about 1 MHz.

The speed discriminating circuit 13 extracts a pilot signal by passing the reproduction signal read by the magnetic head of the magnetic recording / reproducing mechanical deck 8 through the low-pass filter 12, and based on this pilot signal, the relative relation between the drum and the magnetic tape. The speed is detected and the information is supplied to the system controller 4. As a result, the system controller 4
Detects whether the reproduction signal is one of the first to third image information, and reproduces the recording signal in a format unique to each image information so that the magnetic recording / reproduction processing unit 6 and the servo mechanism unit. Control 7

The display monitor section 14 is a section for reproducing the image information read by the magnetic head as a screen. That is, the image information that has been reproduced by the magnetic recording / reproduction processing unit 6 and demodulated as an analog signal is converted into a digital signal by the D / A / A / D converter 9, and the display information is stored in the display memory 15 via the memory 1. The information for a plurality of tracks corresponding to one screen is stored in the display memory 15 and the screens for the plurality of tracks are assembled and displayed on the display monitor unit 14 as one screen.

In the above embodiment, the image information, which is a digital signal supplied from the image information supply source, is stored in the memory 1.
, And the system controller 4 determines which of the first to third image information is at the time of reading all pixels, and corresponds to the first to third image information based on the determination result. The image information FM-modulated by the magnetic recording / reproducing processing unit 6 so as to have a unique format is recorded on a magnetic tape in the magnetic recording / reproducing mechanical deck 8 under the control of the servo mechanism unit 7 together with the pilot signal transmitted from the pilot signal oscillator 10. Record.

As a result, one piece of image information is recorded on the magnetic tape divided into a predetermined number of plural tracks in any of the first to third formats shown in FIG.

[0039]

As described above in detail with the embodiments, according to the present invention, image information corresponding to one screen is divided into a plurality of pieces, which are assigned to a plurality of tracks of a recording medium and recorded. Therefore, high-quality image information can be magnetically recorded / reproduced by a small-diameter drum, that is, a small-sized device. Further, the larger the number of pixels, the faster the relative speed between the magnetic head and the recording medium during magnetic recording, and the recording format is changed accordingly. It is possible to magnetically record / reproduce a plurality of pieces of image information on a recording medium magnetically with a single device without causing a space between tracks.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram conceptually showing a memory space of a memory according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram conceptually showing the recording format of the embodiment of the present invention.

[Explanation of symbols]

 1 memory 4 system controller 5 magnetic recording / reproducing system 6 magnetic recording / reproducing processing unit 7 servo mechanism unit 10 pilot signal oscillator 14 display monitor unit

Claims (3)

[Claims] 1. A storage means for temporarily storing image information sent from an image information supply source, reading the image information and sending it to a magnetic recording system, and a modulation for modulating the image information sent by the storage means. A magnetic recording system for magnetically recording a signal on a recording medium together with a pilot signal synchronized with this modulation signal, and the relative speed between the magnetic head and the recording medium at the time of recording is set to be high as the number of pixels of the image information increases. With 1
Depending on the number of pixels for which a large number of screen divisions per sheet is set, any one of a plurality of formats that are individually predetermined is selected, and the image information is displayed under the modulation condition and relative speed specific to the number of pixels. A relative velocity variable magnetic recording apparatus comprising: the storage means and a control means for controlling the magnetic recording system so that recording is performed by dividing the recording medium into a plurality of tracks. 2. The relative speed is set so that the track width of the recording medium is the same and the space between the tracks cannot be formed regardless of the number of pixels. Variable relative speed magnetic recording device. 3. A reproducing apparatus for signals recorded by the relative velocity variable magnetic recording apparatus according to claim 1, wherein the magnetic reproducing system magnetically reproduces image information recorded on the recording medium, and the recording medium. The number of pixels of the reproduction signal is detected based on the pilot signal extracted from the reproduction signal of the signal recorded in (1), and the magnetic reproduction system is controlled to reproduce the image information in a format specific to this number of pixels. And a control means for controlling the display means so that the display means displays the assembled image on one image.