JPH04356877A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve operability without increasing the number of parts by providing an operating means to operate both the reproduction of a special effect in the case of reproducing and the driving operation of a zoom lens in the case of recording. CONSTITUTION:In the case of recording, switches 4, 15 and 17 are changed over to a side (a) and a switch 5 is turned on. Therefore, the video signals image picked-up by a lens 1 are passed through the switches 4 and 5 and recorded on a magnetic tape 9, and the zoom operation is passed through the switch 17 to operate a drive circuit 20. In the case of reproducing, the switches 4, 15 and 17 are changed over to a side (b) and the switch 5 is turned off. Therefore, the video signals read from the tape 9 are passed through the switch 15 and read out to a special processing memory 12 at a frequency corresponding to the read zoom ratio. Thus, since the switches are used both as the zoom lens drive switch in the case of recording and the switch for the special effect in the case of reproducing, the number of parts is prevented from being increased and the operability is improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus, and more particularly to a magnetic recording and reproducing apparatus having an image memory and capable of reproducing recorded images with special effects.

0002

[Prior Art] In recent years, in the field of magnetic recording, there has been an increasing demand for high-density recording, and video tape recorders (V
(TR) as well, tape running speed has been lowered to perform higher density recording. When the running speed of the tape decreases, for example, when an audio signal is recorded using a fixed head, a problem arises in that the relative speed cannot be maintained large and the reproduced sound quality deteriorates.

One way to solve this problem is to make the length of the track scanned by the rotary head longer than before.
There is a method of sequentially recording time-base compressed audio signals in the extended portion. Specifically, in a rotating two-head helical scan type VTR, magnetic tape was conventionally wrapped around a rotating cylinder by more than 180 degrees.
In this method, the tape is wound around a rotating cylinder by more than (180+θ) degrees, and an audio signal that is converted into PCM and time-axis compressed is recorded in the extra wrapped “θ” portion.

FIG. 3 is a diagram showing a tape running system of a conventional VTR, and FIG. 4 is a diagram showing a recording locus on a magnetic tape by the VTR shown in FIG. In FIGS. 3 and 4, 9
is a magnetic tape, 22 is a rotating cylinder, 8A and 8B are heads attached to the cylinder 22, 23 (FIG. 4) is a video signal area of a track formed on the tape 9, and 24 (FIG. 4) is a PCM This is the audio area part. The video signal area portion 23 is the rotary cylinder 2
The PCM audio area portion 24 is traced by 180 degrees of the rotary cylinder 22 by each of the heads 8A and 8B. As described above, as an example of applying the method of recording a digital signal in another area while recording a video signal, it has been proposed to record a still image in the digital signal area as a digital signal.

[0005] In the case of a still image, by scanning the PCM area multiple times, it is possible to record all of the information on the magnetic tape. According to this method, it is not only possible to shoot still images using the same photographic device and same recording medium as for video shooting, but also to stop the running of the tape in a conventional VTR and play back the video signal of the same track. It is possible to obtain still images of higher quality than still images.

Next, the operation of a conventional camera-integrated VTR will be explained with reference to FIG. FIG. 5 is a block diagram of a conventional magnetic recording/reproducing apparatus. In FIG. 5, 1 is a lens of a camera unit, 2 is an image sensor that converts an image into an electric signal, 3 is a signal processing circuit that converts the electric signal into a video signal, and 4 is a normal video signal and a special effect. 5 is a switch for disabling the recording operation during playback, 6 is a recording processing circuit that performs processing for recording video signals on tape, 7 is a viewfinder for the video monitor, 8 is a A head for recording signals, 9 a magnetic tape, 10 an A/D converter for converting the signal processed by the signal processing circuit 3 into digital data, 11 an image memory for temporarily storing video signal data, 12 a video Special effect memory for giving special effects to signals, 1
3 is a D/A converter that converts digital data into a video signal, and 14 is a reproduction processing circuit that performs processing to reproduce the video signal.

15, the signal at the time of reproduction is A/D10 at the time of recording.
16 is a switch that operates the zoom lens, 18 is a system control microcomputer (called a system controller) that controls the operation of each part of the VTR, still image recording, special effects, etc., 19 is A/D 10, image memory 11, a timing generation circuit that generates timing signals for each of the special effect memory 12 and the D/A 13; 20, a zoom drive circuit that drives the zoom motor 21 according to signals from the zoom lens 16; 21, drives the lens 1; The motor 25 is a switch for electronic zoom.

Next, the operation of this conventional example will be explained using FIG. First, during recording, when an input is made to the zoom switch 16, the lens 1 is driven by the zoom drive circuit 20 and motor 21. Further, a signal passed through the lens 1 and captured by the image sensor 2 is converted into a video signal by the signal processing circuit 3. The video signal passes through switches 4 and 5, is converted into a recording signal by a recording processing circuit 6, and is recorded on a magnetic tape 9 by a head 8. Further, the situation can be monitored using the viewfinder 7.

Next, for example, an electronic zoom operation, which is a special effect during playback, the system controller 18 issues a command corresponding to the signal input by the electronic zoom switch 25, and the timing generator 19 generates a desired clock. let On the other hand, the head 8 converts the signal recorded on the magnetic tape 9 into an electrical signal, which is then converted into a video signal by the reproduction processing circuit 14. This video signal is sent to the A/D converter 10
is converted into digital data by the image memory 11,
The special effects memory 12 performs electronic zoom, the D/A converter 13 converts the signal into an analog video signal, and the viewfinder 7 monitors the signal. In this case, each of the switches 15, 4, and 5 has been displaced to the position shown by the dotted line.

0010

[Problems to be Solved by the Invention] However, the conventional camera-integrated video camera equipped with an image memory has a special effect playback function added compared to a video camera not equipped with the image memory. It is necessary to provide a new operation unit (for example, the electronic zoom switch 25) for this purpose, which poses the problem of an increase in the number of parts and an increase in cost.

The present invention has been made to solve the above-mentioned problems, and the operation means is used for both the reproduction of special effects during playback and the operation of driving the zoom lens during recording. The purpose of this invention is to prevent an increase in the number of points, improve operability, and obtain an inexpensive and high-performance magnetic recording/reproducing device.

0012

[Means for Solving the Problems] Therefore, in the present invention, in a magnetic recording and reproducing device that has an image memory and is capable of reproducing special effects of recorded video, it is possible to reproduce special effects during reproduction. This object is achieved by a magnetic recording/reproducing apparatus which is provided with operation means that also performs the respective operations of driving a zoom lens during recording.

[0013]

[Function] The magnetic recording and reproducing apparatus according to the present invention uses the operating means to perform both the reproduction of special effects during reproduction and the operation of driving the zoom lens during recording.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram showing addresses in an image memory of this embodiment. In the figure, the same reference numerals as those in the conventional example indicate the same or equivalent components, and their repeated explanation will be omitted.

In FIG. 1, A is an operating means, which is composed of a changeover switch (hereinafter referred to as a switch) 17,
This means serves both to reproduce special effects during playback and to drive the zoom lens 1 during recording. Y is a magnetic recording/reproducing device (hereinafter referred to as the device).

Furthermore, mode switching between recording and reproduction is performed by a switch 17, and switches 4, 5, and 15 are also linked to the mode switching operation of this switch 17.

First, the recording operation of this embodiment will be explained with reference to FIG. In FIG. 1, first the switch 17
By switching to the recording side a (indicated by a solid line in the figure), the switch 4 is set to the a side and the switch 5 is turned on. Next, the signal captured by the image sensor 2 through the lens 1 is converted into a video signal by the signal processing circuit 3.

The video signal passes through switches 4 and 5, is converted into a recording signal by a recording processing circuit 6, and is recorded on a magnetic tape 9 by a head 8. Further, the situation can be monitored by connecting a television or the like to the video output 7.

On the other hand, in the zoom operation at this time, an input to the zoom switch 16 activates the zoom drive circuit 20 via the switch 17, drives the zoom motor 21, and moves the zoom lens 1.

Next, an electronic zoom operation during playback, which is exemplified as a special effect of this embodiment, will be explained with reference to FIG. In FIG. 1, at the same time as the switch 17 is switched to the reproduction side (b) (indicated by a dotted line in the figure), the switch 4 is turned to the b side and the switch 5 is turned off.

Next, the signals recorded on the magnetic tape 9 are read by the head 8 and converted into video signals by the reproduction processing circuit 14. The video signal passes through switch 15 to A
The data is converted into digital data by the /D converter 10 and temporarily stored in the image memory 11 at the clock frequency WCK. Among the image data stored here, data corresponding to a desired zoom ratio is read and read out to the special processing memory 12 at a clock frequency RCK that can correspond to the desired zoom ratio, unlike the clock frequency WCK. .

The image data read here is electronically zoomed data, which is converted into a video signal by the D/A converter 13, passed through the switch 4, and is output as a video signal (
(viewfinder) 7. The clock frequencies WCK and RCK for reading to and from the image memory 11 are determined by the zoom switch 16, the switch 17, the system controller 18,
It is generated via the timing generation circuit 19.

Next, the basic principle of the electronic zoom will be explained using FIG. 2. FIG. 2 shows the image memory 1 of this embodiment.
1 is a diagram illustrating addresses within 1. FIG. In FIG. 2, this example shows a telephoto operation from an image in an A×A area to an image in a B×B area. First, zoom switch 16
(Fig. 1), the first data of the image data (hereinafter referred to as the starting point) is configured to move in the diagonal direction (arrow), and when inputting on the tele side, it moves from the upper left ■ to the center ■
When inputting on the wide side, it moves from the center ■ to the upper left ■. In this embodiment, zoom switch 1
It is assumed that the input number 6 is in the tele direction, and the starting point is moved from ■ to ■.

When the starting point ■ is determined, the ratio of the distance A1 between the starting point ■ before the telephoto operation and the center point ■ of the image data and the distance B1 between the starting point ■ and the center point ■ is calculated, and B1 /A1
The zoom ratio of the image is determined by Furthermore, the width B of the pixel area to be expanded is determined by this zoom ratio, and B×B
The image data of the area is read with clock frequency WCK. Furthermore, this image data is A1 / which is the reciprocal of the zoom ratio.
Special processing memory 1 is activated by clock frequency RCK of B1.
2 and converted into an analog video signal by the D/A converter 13.

[0025] This method can be operated in a similar manner not only during telephoto operation but also during wide-angle operation. Further, by repeating the above operation, almost continuous electronic zoom operation becomes possible.

In the above embodiment, the zoom switch is used both for the zoom operation during recording and for the electronic zoom operation during playback, but the invention is not limited to this, and for example, a manual zoom lever may also be used. It is possible.

[0027]

[Effects of the Invention] As explained above, the present invention prevents an increase in the number of parts and improves operability by providing an operating means that allows the zoom lens drive switch used during recording to also be used as a special effects switch during playback. Therefore, an inexpensive and high-performance magnetic recording/reproducing device can be provided.

[Brief explanation of drawings]

[Fig. 1] A configuration diagram of a magnetic recording/reproducing device that is an embodiment of the present invention.

[Figure 2] Diagram showing addresses in the image memory of this embodiment

[Figure 3] Diagram showing the tape running system of a conventional VTR

[
Figure 4 Diagram showing the recording trajectory on the magnetic tape by the VTR shown in Figure 3

[Figure 5] Block diagram of a conventional magnetic recording and reproducing device

[Explanation of symbols]

A. Operation means Y Magnetic recording and reproducing device 11 Image memory 12 Special processing memory 14 Reproduction processing circuit 16 Zoom switch 17 Changeover switch 18 Cisco 20 Zoom drive circuit Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] Claim 1: In a magnetic recording and reproducing device having an image memory and capable of reproducing special effects of recorded video, operations for reproducing special effects during reproduction and driving a zoom lens during recording are provided. 1. A magnetic recording and reproducing device characterized by comprising an operating means that also serves as.