KR970006794B1 - Recording and reproducing apparatus of vcr - Google Patents

Abstract

a rotation drum; a signal converting means converting an input video signal to a signal recordable on a tape; a first head to record and to play the video signal through the signal converting means; a second head installed on the rotation drum with the first head; a synchronization signal separation means separating a synchronization signal from the video signal; a control means providing a switching control signal synchronized to the synchronization signal; a first switching means switching a signal inputted to / outputted from the first head; and a second switching means switching a signal inputted to / outputted from the second head.

Description

VCR recording and playback device

1 is a configuration diagram of a rotating drum used in a general VHS hi-fi VCR.

2A and 2B are positional state diagrams on the tape of each head in FIG.

3 is a block diagram showing an embodiment of the recording and reproducing apparatus of the present invention.

4A to 4F are signal waveform diagrams in respective parts of FIG.

5a to c are tape pattern diagrams recorded by the apparatus of FIG.

6 is a functional performance algorithm diagram of the controller in FIG.

* Explanation of symbols for main parts of the drawings

1, 2, 3, 4, 12, 13, 16, 23, 24: head

5: drum 6: tape

10: signal conversion unit 11: recording amplifier

14, 25: switching unit 15: synchronous separation unit

17: PG detection unit 18: phase comparison unit

19: drum motor 20: phase control unit

21: audio signal processor 22: amplification unit

26: controller 27: time delay unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a VCR recording and reproducing apparatus, particularly for selectively recording and reproducing information when recording or reproducing information on tape.

In general, in the VHS Hi-Fi method, as shown in FIG. 1, video heads 1 and 2 and audio heads 3 and 4 are installed on a rotating drum 5. Here, the audio signal is recorded by the audio heads 3 and 4 with FM (Frequency Modulation) modulated, and this audio signal is taped in advance of the video signal as shown in FIGS. 2A and 2B. (6) The depth is recorded in the thickness direction.

Since the carrier of the audio signal is set to have a lower frequency than the carrier of the luminance signal, the gap of the audio heads 3 and 4 is wider than the gap of the video heads 1 and 2, so that the deeper portion of the magnetic layer of the tape 6 is formed. It can be magnetized to

The video signal is recorded superimposed on the audio signal. That is, since the video signal is recorded on the audio signal recorded once, the video signal is recorded on the surface of the tape 6 first, and the magnetization force is low at the deep part of the tape, so that the audio signal remains, so that two kinds of signals can coexist. .

On the other hand, the VHS method and the? Method are recorded and reproduced by the rotating head helical scan method.

That is, since the rotating drum 5 records the FM synchronized video signal on the tape 6 while rotating 30 times per second in synchronization with the frame frequency (30 Hz) of the video signal, the tape 6 has two tilted tracks per 1/30 second. The two slope tracks are formed of even field and odd field to record one picture, that is, one frame of video signal.

However, according to the above-described recording and reproducing apparatus of the VCR, in order to increase the amount of recording information on a certain amount of tape, it is possible only by switching from the standard recording mode to the triple speed recording mode or the like, as is well known in the art. There is a problem.

In addition, in the case of different types of video screens, a user may have to manually edit two video screens recorded on separate tapes. Accordingly, the present invention has been made to solve the above problems, the object of the present invention is as follows.

Firstly, it is to provide a recording and reproducing apparatus of V-CAL capable of obtaining a special editing effect in which two kinds of video images recorded on one video tape are reproduced in an over lap state.

Secondly, to provide a recording and reproducing apparatus of V-CAL capable of selectively reproducing only one video image of two kinds of video images recorded on one video tape, resulting in a double information recording effect. .

V-real recording and reproducing apparatus according to the present invention for achieving the above object is a rotating drum, a signal conversion means for converting an input video signal into a recordable signal on a tape, the signal conversion means is installed on the rotating drum A first head for recording and reproducing the video signal through a second head, a second head provided on the rotating drum together with the first head, and synchronous signal separating means for separating a synchronous signal from the video signal, a field insertion recording mode signal (B) control means for providing a switching control signal synchronized with the synchronous signal separated from the synchronous signal separating means when a field selection regeneration mode signal is input, controlled by the switching control signal from the control means and input to the first head; / First switching means for switching the output video signal, and the switch from the control means A second switching means for switching a signal input / output to the second head controlled by a switching control signal, the tape according to the switching control signal from the control means upon inputting the field insertion recording mode signal; Erasing one field per frame of another video signal already recorded in the second head by selectively recording the video signal through the signal converting means by the first head in the erased field; In response to the field selection reproduction mode signal input, one field of the two video signals recorded for each field on the tape is selectively reproduced by the first head according to the switching control signal from the control means. .

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the VR recording and reproducing apparatus according to the present invention.

3 shows one embodiment of the recording and reproducing apparatus of the present invention. Referring to FIG. 3, the apparatus of the present invention includes a signal converter 10 for frequency-modulating (FM) the luminance signal and performing low-pass conversion on the color signal to convert the composite video signal into a recordable signal, the signal conversion. A recording amplifier 11 for amplifying the output of the unit 10, two video heads 12 and 13 mounted on a rotating drum (not shown) for recording / reproducing a video signal, and the recording amplifier ( A first switching unit 14 for switching and controlling the video signals supplied from the video heads 12 and 13 to the video heads 12 and 13, and a synchronous separation unit 15 for separating the synchronous signals from the composite video signal. PG (Pulse Generation) head 16 for generating pulses corresponding to the rotational speed of the rotating drum, PG detector 17 for detecting PG signals from the PG head 16, and the sync separator 15 The phase difference between the synchronization signal and the PG signal of the PG detection unit 17 is compared and detected. Drum phase control unit 20 for controlling the phase of the drum by controlling the drum drive motor 19 according to the phase comparator 18, the drum drive motor 19, and the signal from the phase comparator 18 It is provided.

The apparatus further includes an audio signal processor 21 for processing an audio signal, a hi-fi recording amplifier 22 for amplifying an audio signal into a recordable signal on a tape, and a hi-fi recording amplifier provided on a rotating drum. Switching control of two hi-fi audio heads 23 and 24 for recording / reproducing the audio signal output from 22) and an audio signal supplied from the hi-fi recording amplifier 22 to the hi-fi audio heads 23 and 24. A controller 26 for providing switching control signals to the first and second switching units 14 and 25 according to a synchronization signal input from the second switching unit 25 and the synchronization separating unit 15. The switching control signal applied to the switching unit 25 is composed of a time delay unit 27 for delaying a predetermined time than the switching control signal applied to the first switching unit 14.

The operation of the recording and reproducing apparatus of the present invention configured as described above is as follows.

First, the field insertion recording mode for inserting and recording a new video signal for each field on the video signal track recorded on the tape 6 will be described.

The input composite video signal is converted into a signal that can be recorded on a tape by the signal converter 10, and then amplified by the record amplifier 11, and then the first switching unit 14 has a waveform as shown in FIG. 4A. Will output

In addition, the synchronization signal separated from the composite video signal by the synchronization separator 15 and the PG signal detected by the PG head 16 and the PG detector 17 are inputted to the phase comparator 18 to compare the phases. . The phase difference signal output from the phase comparator 18 is input to the drum phase controller 20, and accordingly, the drum phase controller 20 controls the phase of the drum drive motor 19 to control the video heads 12 and 13. Is recorded at the lower end of the tape 6 track.

In the field insertion recording mode, the controller 26 generates a recording control switching signal synchronized with the vertical synchronization signal among the synchronization signals output from the synchronization separation unit 15 as shown in FIG. The parts 14 and 25 are controlled as shown in Figs. 4C and 4F.

At this time, the recording control switching signal for controlling the second switching unit 25 to correct the mechanical positional difference between the video heads 12 and 13 and the hi-fi audio heads 23 and 24 is shown in FIG. As described above, after a predetermined time delay is transmitted through the time delay unit 27, the second switching unit 25 is transmitted.

Meanwhile, in the field insertion recording mode, the controller 26 controls the audio signal processor 21 to selectively erase only video information of a track to be newly inserted by the hi-fi audio heads 23 and 24 as shown in FIG. To perform the role of the erase head. Subsequently, new information is recorded in the track erased by one of the rotating video heads 12 and 13, resulting in the track being inserted in the inserted form.

5 shows one embodiment of track insert recording modes.

FIG. 5 (a) shows a field insertion recording mode in which a new video signal is recorded in one of the even field or the odd field constituting one frame of the original recording pattern track. FIG. In this mode, field insertion recording is performed and new information is recorded in successive frame units. FIG. 5C shows a tape recording pattern in a mode in which new video signals are inserted and recorded in successive frame units for a predetermined time. Indicates. Different playback effects can be obtained according to the tape playback method recorded in the above recording mode. In other words, when a field-inserted tape is played back by a general playback method, two kinds of video images are overlapped and reproduced. In the field selection playback mode, only a video signal recorded in one field can be selectively played back. have.

6 is a functional performance algorithm diagram of the controller 26 in FIG. 3 in the field insertion recording mode.

Referring to FIG. 6, when recording starts (100), it is searched for field insertion recording (101). If it is a field insertion record, it is again detected whether it is a field insertion record for a certain time (102), and then a field insertion record for a predetermined time is found. Then, a predetermined time is counted to generate a recording control signal for a predetermined time (103).

If the field insertion recording is not performed for a predetermined time, the continuous recording control signal is generated until the field insertion recording stop signal is applied (104, 105).

On the other hand, after the field insertion recording signal is not applied in step 101 or the recording control signal is generated for a predetermined time in step 103, normal recording is performed until the recording stop signal is applied (106, 107). Is stopped or a recording stop signal is applied (108).

In the embodiment of the present invention, the hi-fi audio head is used as the element head, but other heads mounted on the drum may be used as the erasing head.

As described above, the present invention has the advantage that the special editing function by overlapping is possible, two or more pieces of information can be inserted into the same amount of tape, and playback can selectively display only one piece of information in any field. have.

Claims (3)

Rotating drum; Signal conversion means for converting an input video signal into a signal recordable on a tape; A first head mounted on the rotating drum for recording and reproducing the video signal through the signal conversion means; A second head installed on the rotating drum together with the first head; Sync signal separating means for separating the sync signal from the video signal; Control means for providing a switching control signal synchronized with said synchronization signal separated from said synchronization signal separating means when inputting a field insertion recording mode signal or a field selection regeneration mode signal; First switching means controlled by the switching control signal from the control means to switch a signal input / output to the first head; And second switching means for switching the signal input / output to the second head controlled by the switching control signal from the control means, wherein the input from the control means upon inputting the field insertion recording mode signal. The field is erased by the second head in every frame of the other video signal already recorded on the tape according to a switching control signal, and the video through the signal converting means by the first head in the erased field. Optionally record the signal; Recording of V-Cal for selectively reproducing one of the two video signals recorded for each field on the tape by the first head according to the switching control signal from the control means upon inputting the field selection reproduction mode signal; and Playback device. The switching control signal according to claim 1, wherein the switching control signal provided from the control means to the first or second switching means is corrected to the position difference to correct a position difference between the video head and the audio head installed on the rotating drum. 24. A recording and reproducing apparatus of V-Cal further comprising one time delay means for delaying by a corresponding time. 2. A recording and reproducing apparatus according to claim 1, wherein said second head is an audio head provided on said rotating drum.