JPS58194479A - Video recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the cost for recording and reproeduction of a still picture, a slow scan video, etc., by reading out a video signal at a low speed and then recording it. CONSTITUTION:A high-speed and wide-band video signal undergoes an A/D conversion at a high speed and is stored temporarily in a memory 3. When data equivalent to a screen are written, these data are all transferred to the memory 30. Then the data of the memory 30 are read out at a low speed and recorded on a magnetic tape 21, etc. with a low speed and a narrow band after a D/A conversion. In a reproduction mode, a reproduced signal of a low speed is written into a memory 11 after an A/D conversion and then transferred to a memory 32 when data equivalent to a screen are stored. The data of the memory 32 is read out at a high speed and then delivered to a video device 15 with a high speed and wide band after a D/A conversion to perform a vidwo reproduction.

Description

[Detailed Description of the Invention] This invention provides video m4 such as television images! The present invention relates to a video recording and reproducing device that records and reproduces video files.

Conventional video recording and playback devices include video tape recorders, but f! In addition to requiring a wide signal band and a high-density recording medium, there are also problems such as the need for a head with a special depth.
It could not be said that the purpose of slow scan video was necessarily met from an economic point of view.

Therefore, an object of the present invention is to provide a video recording and reproducing apparatus that can record and reproduce static N images, slow scan videos, etc. at low cost.

The present invention is for reproducing still images, slow scan videos, etc. onto low-density recording media.

Examples will be described below based on the drawings.

Figure 1 (!1), Φ) is a movie of the dormitory embodiment of this invention.
! A block diagram of a recording/reproducing apparatus is shown, in which (1) is a recording system and φ)tj reproducing. In FIG. 1, a video signal generating means 1 is a TV zone broadcast fluorescent signal, a video camera signal! Alternatively, it generates a video signal or the like produced by a combinator or the like. These video signals are analog digital
is digitized by ρ converter 2, and Ill's memo v
3 is stored at high speed as one screen of video data. In this case, in order to associate the positions of the four sides with the storage areas in the first memo 13, the address counter 4 writes the video data to a predetermined address. When one screen worth of data is written to the first memo 3, all the data is written to the second memo v.
Transferred to 30. In this way, the video data stored in the second memory 30 is read out at a low speed to match the speed of the low-density recording medium, and at the same time is converted into an analog signal by the digital-to-analog converter 5. The low-speed, narrow-band analog signal thus obtained is applied to the recording head 7 through the recording circuit 6 and recorded on the magnetic tape 21.
First, the case of reproduction will be described. The video analog signal t recorded on the magnetic tape 21 is converted to analog/digital JIA/conversion l through the playback head 8 and the playback circuit 9.
! After being converted into digital JIA/data from the IOK, it is stored in the first memory 11 at a low speed. Address counter 12tj is for incrementing the memory address while obtaining the correspondence between the two image positions and the memory address. Once data for one screen is stored in the tenth screen 11 in this way, it is transferred to the second memory 32. This data p in the memory 32 of Sg2 is read out after being associated with the video position using the address callan 733, and converted into an analog signal at high speed by the high-speed digital-to-analog converter 13. It is converted into a signal with similar speed and bandwidth. This signal drives the video device 15 through the video circuit 14 to reproduce the video.

As described above, in this embodiment, a high-speed, wideband video signal is converted from analog to digital at high speed and temporarily stored in the 10th memory 3, and all data in the first memory 3 is transferred to the second memory. Transfer the data to the memo '130 and read the data in the second memory 30 at low speed to generate digital/analog signals.The data is slower and narrower than K, making it possible to record on low-speed magnetic tape 21, etc. It has become possible to record images and slow scan video at low cost.

Also, during playback, the low-speed playback signal is converted into an analog/decimal
After jH11, #! is stored in the first memory 11. Transfer the data in the memory 11 of @1 to the second memory 32, and create the second memo! It reads 132 data at high speed and converts it from digital to analog, making it faster and wider than Kotoni, making it possible to output to a video device 1IIF15 (cathode ray tube) and play back the video, producing still images, slow scan video, etc. Ktk is popular for inexpensive reproduction, and integrated circuits are also a possibility.

In addition, as mentioned above, it is possible to record and play back images on compact cassettes and other audio power tapes that are commonly used, so it can be used as a simple static IF image or slow scan TV. This is not a fool's errand, and new applications can be considered, and the effects are truly significant.

FIG. 2 shows a plotter diagram of a video recording and reproducing apparatus according to another embodiment of the present invention. Conversion i12.1G + 1st memo J! J3゜IIs 2nd (D) at-v30, 32 Ifs) Ik-af'
131 address counter 4.12 and address counter JI31. - 1 analog-to-digital converter 16 + 1st memory 1 each as 33
7+Second Me 4134+Digital-Analog Converter 18
+Address counter J'19 and address counter 3
Since the book is designed so that 5 can be shared, recording and reproducing can be performed at a lower cost by sharing the circuit. In Fig. 2, S,,S,.

The switch S works to switch between recording and playback in conjunction with S and #ti.The switch S converts the output of the video signal generation circuit 1 and playback circuit 9 from analog to digital at the time of recording and playback! Switch input to @16, switch s2r; t day
The output analog signal of the digital to analog converter 18 is switched and supplied to the recording circuit 6 and the video circuit 14 during recording and playback, and the switch 53Fi clock generation and variable circuit 20
change the tarokk frequency. Analog-to-digital converter 16, first memory 17. The second memory 34 and the digital/analog converter 18 are of a variable operating speed type in which a tallofter is supplied by the clock generation and variable circuit sO, and the analog/digital converter 1
6 and the first memory 17, the tarotsuta frequency inputted during recording and playback is switched between high and low, and the second memory 3
4 and the digital/analog converter 18, the input crofter frequency is switched between low and high during recording and playback.

As described above, the video recording and reproducing apparatus of the present invention includes: a video signal generating means for generating a video double amount; a recording analog-to-digital converter for converting the output of the video signal generating means into high-speed analog and digital; This recording m is the first stage in which the output digital signal of the analog-to-digital converter is written at high speed.
a second recording memory to which data in the first historical memory is transferred and read out at low speed;
The data continued from this second recording memory
! (bIB recording system having a digital/analog converter for low-speed yspp-to-analog conversion, and a recording means for recording the output analog signal of this recording digital/analog signal on a low-density recording medium. a reproducing means for reproducing the analog signal recorded on the low-density recording medium; a reproducing analog-to-digital converter for converting the output of the reproducing means from low-speed analog to digital; A first playback memory into which the output digital signal of the converter is written at low speed, a second playback memory to which the data of this first playback memory is transferred and read out at high speed, and this second playback memory. Data read from memory is converted into digital/analog at high speed.
Since it is equipped with an analog converter and a reproduction system that projects the output analog signal of the analog converter for reproduction on a video device as a video and outputs it, it can produce static W images and slow scan images. This has the effect of being able to record and reproduce data at low cost.

[Brief explanation of the drawing]

FIG. 1(a) is a plotter diagram of a recording system according to an embodiment of the present invention; FIG.
The figure is a profile diagram of another embodiment of the invention.

Claims (2)

[Claims] (1) Video signal generation means for generating a video signal. a recording analog-to-digital converter for high-speed analog-to-digital conversion of the output of the video signal generating means; a first recording memory into which the output digital V signal of the recording analog-to-digital converter is written at high speed; The data in the first recording memory is transferred and read out at a low speed.
a recording memory, a recording digital-to-analog converter for converting the data read from the second recording memo into low-speed digital to analog converters, and a recording digital to analog converter for this recording digital to analog converter. a recording system having a recording means for recording an output analog signal on a low-density recording medium; and &! on the low-density recording medium. A reproduction means for reproducing the recorded analog signal, a reproduction analog-to-digital converter for converting the output of the reproduction means from low-speed analog to digital, and an output digital signal of the reproduction analog-to-digital converter is written at low speed. A first playback memory, a second playback memory to which data in the @1 playback memory is transferred and read out at high speed, and a high-speed digital Playback data 5 for analog conversion
) A video recording/playback device comprising a playback system having an izv/analog converter and a video creation means for projecting an output analog signal of the playback digital/analog converter as a video on a video device. (2) The recording analog-to-digital converter, the first and second starting memories, and the recording digital-to-analog converter each have variable operating speeds depending on the clock signal, and the input By switching the output and switching the clock signal, the analog-to-digital converter for reproduction, @1
and ts2 playback memory and playback digital
The video recording and reproducing device according to claim α), each of which is used in common as an analog converter.