JPH04335792A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reproduce a luminance signal and a color signal and also a still picture without noise and a video image with excellent resolution. CONSTITUTION:A 1st modulator 54 with a broad frequency band and a 1st converter 56 with a narrow frequency band are used and a luminance signal and a color signal are recorded by a magnetic head 62a. A magnetic head 62b records a signal from other modulator and converter. At reproduction, the luminance signal reproduced by the magnetic head 62a is stored in a 1st memory and a color signal reproduced by the magnetic head 62b is stored in a 2nd memory. Output signals from the 1st and 2nd memories are converted into a video signal at a 2nd signal processing unit to obtain a video image with high resolution.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving the image quality of a magnetic recording and reproducing apparatus for recording video signals.

0002

2. Description of the Related Art In recent years, video tape recorders, which are magnetic recording and reproducing devices, have become commonplace, and many types for television recording and camera-integrated types are being produced.

[0003] A conventional video tape recorder will be explained below. FIG. 5 shows a block diagram of this conventional video tape recorder, and FIG. 6 shows a spectrum of a signal recorded by the video tape recorder shown in FIG. In FIG. 5, 1 is an input terminal into which a video signal is input;
3 is a first video signal processor that separates the input video signal into a luminance signal and a color signal and outputs it; 3 is a modulator that converts the luminance signal into a frequency modulation signal; and 4 is a modulator that converts the chrominance signal into a low frequency signal. The output signal of the modulator 3 and the output signal of the first converter 4, which are the first converters, are added in an adder 5 and applied to a first amplifier 6. 8a and 8b are magnetic heads attached to the rotating cylinder 7, to which the output signal of the first amplifier 6 is applied. 9 is a magnetic tape that is wound around the rotating cylinder 7 and runs; 10 is a second amplifier that amplifies the signals reproduced by the magnetic heads 8a and 8b; and 11 is a frequency modulated signal output from the second amplifier 10. a demodulator for converting into a luminance signal; reference numeral 12 is a second converter for converting the low-pass converted color signal output from the second amplifier 10 into the original color signal;
13 is a second video signal processor that converts the luminance signal and color signal into a video signal; 14 is an output terminal from which the video signal is output. The operation of the video tape recorder configured as above will be explained below. do.

First, the recording operation will be explained. The video signal input to the input terminal 1 is sent to the first video signal processor 2.
The signal is separated into a luminance signal and a color signal. The luminance signal is then converted into a frequency modulated luminance signal by the modulator 3, and the chrominance signal is converted into a frequency modulated luminance signal by the modulator 3.
After being converted into a low frequency conversion color signal by the converter 4, the adder 5
is added. The output signal of the adder 5 is amplified by a first amplifier 6 and applied to magnetic heads 8a and 8b attached to a rotating cylinder 7. Since the magnetic tape 9 is wound diagonally around the rotary cylinder 7 and runs, the output signal of the first amplifier 6 is recorded on the magnetic tape 9 in diagonal tracks. FIG. 6 shows the spectrum of the output signal of the first amplifier 6, where C is a low-pass conversion color signal and Y is a frequency modulated luminance signal. In this way, the video signal is recorded on the magnetic tape 9.

Next, the reproduction operation will be explained. magnetic tape 9
The signals recorded on the
converter 12. In demodulator 11, 1MHz
A frequency modulated luminance signal having a frequency band of about 10 MHz is converted into an original luminance signal. The second converter 12 converts the low frequency converted color signal with a frequency band of approximately 1 MHz into
Convert to original color signal. The luminance signal and chrominance signal converted in this way are returned to the video signal in the form inputted at the time of recording by the second video signal processor 13, and then sent to the output terminal 14.
is output to.

[0006]

[Problems to be Solved by the Invention] However, in the conventional configuration described above, in order to record a long video signal with a small amount of tape consumption, both the modulator 3 and the first converter 4, or the first converter The frequency band used by the system is set narrowly. Therefore, there was a problem in that the resolution of the reproduced video signal deteriorated.

The present invention solves the above-mentioned conventional problems, and aims to provide a magnetic recording and reproducing device that can widen the frequency band of the video signal to be reproduced and obtain high-quality video with increased resolution. purpose.

[0008]

[Means for Solving the Problems] In order to achieve this object, the magnetic recording and reproducing apparatus of the present invention includes a memory for storing an input video signal, and a first and second memory for converting a luminance signal into a frequency modulated signal. a second modulator, first and second converters that convert the color signal into a low frequency conversion signal, and a discriminator that discriminates between the first field and the second field of the video signal;
A selector is provided for selecting a signal obtained by adding the output signals of the first modulator and the first converter or a signal obtained by adding the output signals of the second modulator and the second converter.

[0009] Furthermore, the first memory stores the luminance signal reproduced by the first magnetic head, the second memory stores the color signal reproduced by the second magnetic head, and the first and second memories store the luminance signal reproduced by the first magnetic head. It includes a signal processor that receives the output signal of the second memory as an input and outputs a video signal.

[0010] Also, a first memory for storing the luminance signal reproduced by the first magnetic head, a first noise reducer for adding the output signal of the first memory and the luminance signal, etc. a second memory that stores the color signal reproduced by the second magnetic head; a second noise reducer that adds the output signal of the second memory and the color signal; The device is equipped with a signal processor that receives the output signal of the memory and outputs a video signal.

[0011]

[Operation] With the above-described configuration, the present invention provides the first
Regarding the field signals, the first modulator output signal is a frequency modulated luminance signal, and the first modulator output signal is a low-pass converted color signal.
The sum signal of the output signals of the converters is selected by the selector and recorded on the magnetic tape by the first magnetic head. Second
Regarding the field signal, the sum signal of the output signals of the second modulator and the second converter is similarly selected and recorded on the magnetic tape by the second magnetic head. Here, the frequency band used by the first modulator is wider than that of the second modulator, and
The frequency band used by the second converter is set wider than that of the first converter. The signal recorded in this way is reproduced by a magnetic head, and the luminance signal component of the signal reproduced by the first magnetic head is stored in the first memory, and the luminance signal component of the signal reproduced by the second magnetic head is stored in the first memory. The color signal components are stored in a second memory. The output signals of the first and second memories are then converted into video signals by a second signal processor, but since signals with a wide frequency band are to be reproduced, video signals with high brightness and color resolution are obtained. be able to.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a magnetic recording device according to an embodiment of the present invention. In FIG. 1, 51
52 is an input terminal into which a video signal is input; 52 is a signal processor that separates the input video signal into a luminance signal and a color signal and converts it from analog to digital; 53 is a memory that stores the digitized signal; 54, 55; is a first circuit that converts the output signal of the memory 53 into a luminance signal and then converts it into a frequency modulated luminance signal.
and a second modulator; 56 and 57 are first and second converters that convert the output signal of the memory 53 into a color signal and then a low-pass converted color signal; 58 is a first modulator 54 and a first a selector that selects either the sum signal A of the output signals of the converter 56 or the sum signal B of the output signals of the second modulator 55 and the second converter 57 according to the output signal of the discriminator 59; 60 is an amplifier for amplifying the output signal of the selector 58 and recording it on a magnetic tape 63 in addition to the magnetic heads 62a and 62b attached to the rotary cylinder 61; 64 is an amplifier for converting the output signal of the selector 58 into a mixed signal A; It is a switch for switching.

The operation of the magnetic recording apparatus of this embodiment constructed as described above will be explained below. A video signal applied to the input terminal 51 is separated into a luminance signal and a color signal by a signal processor 52, and each is converted from analog to digital. The signal converted to a digital signal is
It is stored in the frame memory 53. The digital luminance signal read out from the memory 53 is converted into a frequency modulation signal by the first and second modulators 54 and 55, and the digital color signal is subjected to low frequency conversion by the first and second converters 56 and 57. converted into color signals. Here, the first modulator 54 has a wider frequency band than the second modulator 55 and has a resolution of about 400 lines, and the second converter 57 has a frequency band about twice as wide as the first converter 56. Therefore, a signal A is obtained by adding together the output signals of the first modulator 54 and the first converter 56, and a signal B is obtained by adding the output signals of the second modulator 55 and the second converter 57.
have spectra as shown in A and B of FIG. 2, respectively. Signals A and B are applied to a selector 58, and when the signal output from the memory 53 is the first field, signal A is selected and when it is the second field, signal B is selected and output. Field discrimination is performed by a discriminator 59 connected to the memory 53, and its output signal drives a selector 58. The output signal of the selector 58 is amplified by an amplifier 60 and then applied to magnetic heads 62a and 62b attached to a rotating cylinder 61. Since the magnetic tape 63 is wrapped around the rotating cylinder 61 and is running,
Recording takes place.

By the way, the conventional video tape recorder records signals with the spectrum shown in FIG. 2A in both the first and second fields, and although the frequency band of the luminance signal Y is sufficient, The frequency band was narrow and the color resolution was insufficient. On the other hand, in the case of the signal shown in FIG. 2B, the frequency band of the color signal is sufficient, but the frequency band of the luminance signal is narrow, and the resolution is insufficient. In order to record the same signal as a conventional video tape recorder with this magnetic recording device, it is sufficient to switch the selector 58 using the switch 64 so that it selects only the signal A. Next, the reproduction of the signal recorded as described above will be described.

FIG. 3 shows a block diagram of a magnetic reproducing apparatus according to an embodiment of the present invention. In FIG. 3, 71
72 is a first signal processor that converts the signals reproduced by the magnetic heads 62a and 62b into a luminance signal and a color signal and then converts them into digital signals; 72 is a first signal processor that stores the luminance signals converted into digital signals; , 73 is a second memory that stores color signals converted into digital signals, and 74 stores signals output from the first and second memories 72 and 73 or output from the first signal processor 71. A second signal processor 75 that converts the signal into a video signal is an output terminal for the video signal. Note that the same reference numerals as in FIG. 1 indicate the same components.

The operation of the magnetic reproducing apparatus in this embodiment configured as described above will be explained. magnetic tape 63
The signals reproduced by the first and second magnetic heads 62a and 62b are converted into a luminance signal and a color signal by a first signal processor 71, and then converted into a digital signal. The luminance signal converted into a digital signal by the signal reproduced by the first magnetic head 62a is stored in the first memory 72.
The color signal is stored in the second memory 73 and converted into a digital signal by the signal reproduced by the second magnetic head 62b. First and second memories 72, 73
are read out at the same timing, converted back to analog signals by the second signal processor 74, converted to video signals, and then output to the output terminal 75. The signals stored in the first and second memories 72 and 73 are signals with a wide frequency band, as described in the recording description, and the reproduced video signals are of high quality. However, since the video signal is composed of the first and second field signals, the video frame frequency is 1/2 that of a conventional video tape recorder.
become. When reproducing a conventional magnetic tape with this magnetic reproducing device, the first signal processor 71 converts the signal into a luminance signal and a color signal, and then directly inputs the signal to the second signal processor 74 to convert it into a video signal. Bye.

As described above, in this embodiment, a memory for storing a video signal, first and second modulators having different frequency bands for converting a luminance signal into a frequency modulation signal, and a low frequency conversion for a color signal are provided. the first and second converters having different frequency bands, and a selector for selecting the output signals of the modulator and converter; It is equipped with first and second memories that separately store the luminance signal and color signal that are recorded and reproduced during playback, and a signal processor that converts the output signal of the memory into a video signal. Since you can select and play the color signal,
You can enjoy high-quality images.

[0019] If the frame frequency is further reduced, higher quality video can be reproduced, and an example of this will be described next. In the magnetic recording device shown in FIG.
When writing the video signal input to 1 to the memory 53,
For example, write every 10 frames. Other operations are performed in the same manner as described above. In other words, the same signal for 10 frames is recorded on the magnetic tape. The reproduction of magnetic tape recorded in this way will be described.

FIG. 4 is a block diagram of a magnetic reproducing apparatus according to an embodiment of the present invention. In FIG. 4, 81 inputs the luminance signal converted into a digital signal output from the first signal processor 71, and performs addition, etc. with the luminance signal stored in the first memory 72 and delayed by one frame. , a first noise reducer that performs write processing in the first memory 72, 8
2 inputs the color signal converted into a digital signal output from the first signal processor 71, performs addition etc. with the color signal stored in the second memory 73 and delayed by one frame, and processes the second signal. This is a second noise reducer that performs writing processing to the memory 73, and the other configurations are the same as in FIG. 3.

The operation of the magnetic reproducing apparatus in this embodiment configured as above will be explained. magnetic tape 63
The signals reproduced by the first and second magnetic heads 62a and 62b are converted into a luminance signal and a color signal by a first signal processor 71, and then converted into a digital signal. The luminance signal converted into a digital signal by the signal reproduced by the first magnetic head 62a is stored in the first memory 72 via the first noise reducer 81. When the rotary cylinder 61 rotates and the magnetic head 62a reproduces the signal of the next track, and the digital luminance signal is input to the first noise reducer 81, the first memory 72
The frame-delayed signal is multiplied by a certain coefficient, added, and stored in the first memory 72. Furthermore, when the rotary cylinder rotates and the signal is reproduced, addition is performed in the same manner as described above, and the noise in the luminance signal stored in the first memory 72 is reduced. This is because the noise contained in the signal reproduced from the magnetic tape is random noise, and only the noise is averaged by adding the same video signals. Regarding the color signal output from the first signal processor 71,
As in the case of the luminance signal, the second noise reducer 82 and second memory 73 reduce noise. The luminance signal and chrominance signal whose noise has been reduced in this way are simultaneously read out from the first memory 72 and the second memory 73, and then sent to the second signal processor 74.
The signal is converted into a video signal and output to the output terminal 75. Here, if a memory is provided to copy and store the signal resulting from 10 frames of input signals and noise reduction, the noise can be reduced by converting the output signal of this memory into a video signal. You can enjoy the resulting high-quality images. Furthermore, if the same signal is recorded in many frames, the noise reduction effect will be improved and a clear still image can be viewed.

As described above, according to this embodiment, the first and second memories that store the luminance signal and color signal reproduced by the magnetic head, and the first and second By providing a noise reducer and a signal processor that converts the output signal of the memory into a video signal, it is possible to convert the same video signal recorded on multiple tracks of a magnetic tape into a signal with a wide frequency band and with reduced noise. video signals can be played back.

[0023]

As described above, the present invention includes a memory for storing an input video signal, and first and second modulators having different frequency bands for converting the luminance signal of the video signal into a frequency modulation signal. , first and second converters with different frequency bands for converting the color signal into a low frequency conversion signal, first and second magnetic heads, and a first memory for storing the reproduced luminance signal. A second memory that stores the reproduced color signal, first and second noise reducers connected to each memory, inputs the output signals of the first and second memories, and outputs a video signal. By being equipped with a signal processor that performs Since the noise generated during recording and playback can be reduced, it is possible to view higher quality images than before.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a magnetic recording device in an embodiment of the present invention.

[Figure 2] Spectrum diagram of the recording signal in the same example

FIG. 3 is a block diagram showing the configuration of a magnetic reproducing device in an embodiment of the present invention.

FIG. 4 is a block diagram showing the configuration of a magnetic reproducing device in another embodiment of the present invention.

[Fig. 5] Block diagram showing the configuration of a conventional video tape recorder

[Figure 6] Spectrum diagram of a recording signal in a conventional video tape recorder

[Explanation of symbols]

52 Signal processor 53, 72, 73 Memory 54, 55 Modulator 56, 57 converter 58 Selector 59 Discriminator 60 Amplifier 61 Rotating cylinder 62a, 62b magnetic head 63 Magnetic tape 64 Switcher 71, 74 Signal processor 81, 82 Noise reducer

Claims (3)

[Claims] 1. A memory for storing an input video signal, a first modulator for frequency modulating an output signal of the memory or a luminance signal component of the video signal, and a frequency band narrower than that of the first modulator. a second modulator; a first converter that performs low frequency conversion of the output signal of the memory or the color signal component of the video signal; and a second converter having a wider frequency band than the first converter; a discriminator for discriminating between a first field and a second field of the output signal of the memory or the video signal;
a first signal that is a mixture of the output signal of the modulator and the output signal of the first converter, or a second signal that is a mixture of the output signal of the second modulator and the output signal of the second converter. a selector that selects and outputs the signal from the discriminator; a switch that stops the operation of the selector based on the output signal of the discriminator; an amplifier that records the output signal of the selector on a magnetic tape; a rotating cylinder to which first and second magnetic heads are attached, to which an output signal is applied. 2. A rotating cylinder to which first and second magnetic heads are attached, and a first signal processor that converts signals reproduced by the first and second magnetic heads into a luminance signal and a color signal. a first memory that stores the luminance signal component reproduced by the first magnetic head; a second memory that stores the color signal component reproduced by the second magnetic head; A magnetic reproducing device comprising: a second signal processor that converts a signal output from a second memory into a video signal. 3. A rotating cylinder to which first and second magnetic heads are attached, and a first signal processor that converts signals reproduced by the first and second magnetic heads into a luminance signal and a color signal. and a first memory that stores the luminance signal component reproduced by the first magnetic head, and adds the output signal of the first memory and the luminance signal component that is the input signal of the first memory. a first noise reducer; and a first noise reducer;
a second memory for storing the color signal component reproduced by the magnetic head; and a second noise reduction for adding the output signal of the second memory and the color signal component that is the input signal of the second memory. and a second signal processor that converts signals output from the first and second memories into video signals.