KR0143253B1 - Two channel simultaneously recording apparatus of vcr - Google Patents

Abstract

The present invention relates to a two-channel simultaneous recording apparatus and method of a video tape recorder, and more particularly, to a video tape recorder capable of simultaneously recording two channels on one tape at the same time and selectively reproducing the two recorded channels. A two-channel simultaneous recording apparatus of.

To this end, a video recorder having a video head drum which loads a tape and generates a switching frequency upon rotation, comprising: two channel recording means for simultaneously recording two channels on the tape, two channels of audio recorded on the tape; Two channel reproducing means for reproducing video data and two channels reproducing means and two channel reproducing means according to the level of the switching pulse generated from the video head drum to record and reproduce two channels on one tape. A micom and a key operation unit connected to the micom to instruct simultaneous recording of two channels, while an audio signal is recorded on two independent tracks, and the video signal is each of one frame composed of two fields. Video signals corresponding to one channel are alternately recorded for each field.

Description

Two-channel simultaneous recording device of video tape recorder (VTR)

1 is a block diagram of a conventional video tape recorder.

(b) is a state diagram of recording of video and audio data of a conventional video tape;

2 is a block diagram of a two-channel simultaneous recording apparatus of a VTR according to the present invention.

3 is a block diagram of a recorder of a VTR according to the present invention.

4 is a regeneration system block diagram of a VTR according to the present invention.

5 is a recording state of video and audio data on a video tape according to the present invention.

* Explanation of symbols for main parts of the drawings

1,2: first and second tuners 3,4: first and second demodulators

5, 6: first and second audio recording circuits 7, 8: first and second audio recording heads

9, 22, 24, 29: first to fourth switching unit 10: video recording circuit

11: Video head drum 12: Mycom

13: Key operation part 14: Tape

20,30: first and second channel receiver 21: video playback circuit

40: two channel recording means 50: two channel playback means

The present invention relates to a two-channel simultaneous recording apparatus of a video tape recorder. In particular, two channels of a video tape recorder capable of simultaneously recording two channels on one tape at the same time and selectively reproducing the two recorded channels. A simultaneous recording apparatus.

A conventional video tape recorder (VTR) generally used is to record only one channel of broadcast program on one tape.

That is, the conventional video tape recorder is largely composed of a recording unit 60 and a reproduction unit 70, as shown in FIG. 1 (a), and is provided to the tuner 61 of a program of a specific channel set by a user's selection. And the signal tuned from this tuner 61 is demodulated by the demodulator 62 to the original signal, and then the audio signal and the video signal are passed through the audio recording circuit 64 and the video recording circuit 63, respectively. It is separately recorded on the tape 14 through the recording heads 65 and 66, and during playback, the video and audio data recorded on the tape 14 are read from the playback heads 73 and 74, and then audio and The video reproduction circuits 72 and 71 demodulate and output the original signal.

At this time, the audio and video data recorded on the tape 14 is recorded in the audio track as shown in FIG. 1 (b), and the video signal is displayed on two frames of the first and first fields. It is to record to (F1) (F2).

Such a conventional VTR is capable of recording only one broadcast channel during a viewing or reserved time period, which makes it impossible to record other broadcasts other than one broadcast channel so that important programs of other channels broadcasting at the same time cannot be viewed. Will be.

Recently, the VTR has been commercialized to record programs on channels other than the broadcasts being watched in the same time zone, but this also allows only one channel broadcast program to be recorded on one tape. There is a disadvantage that can not satisfy the desire of the user to watch the program of the channel.

Accordingly, the present invention selectively transmits two channels to the video circuit in accordance with the high or low frequency level of 60Hz, which is a head switching pulse generated from the video head drum in the microcomputer, so that the audio signal is independent. Each track is recorded in the tracks, and the video signal alternately records video signals corresponding to one channel for each field of one frame composed of two fields.

In addition, during playback, the pulse output from the video head drum outputs the reproduced video signal as it is in the high section, and outputs the video signal delayed by one field from the memory in the low section to select one of the two channels by the user's choice. By providing playback, two channels of broadcast programs can be recorded on one tape, providing a two-channel simultaneous recording device of a video tape recorder that can satisfy the desire of users to watch more channels of programs at the same time. It is an object of the present invention.

According to an aspect of the present invention, there is provided a video tape recorder having a video head drum which loads a tape and generates a switching frequency upon rotation, comprising: two channel recording means for simultaneously recording two channels on the tape; Two-channel reproducing means for reproducing two-channel audio and video data recorded on the tape, and controlling the two-channel recording means and two-channel reproducing means in accordance with the level of the switching pulse generated from the video head drum. A microcomputer for recording and reproducing two channels on the same channel; and a key operation unit connected to the microcomputer to instruct simultaneous recording of two channels, and the audio signal is recorded on two independent tracks, respectively. In each field of one frame consisting of two fields, an image signal corresponding to one channel is alternately recorded. Characterized in that.

Hereinafter, described in detail by the accompanying drawings as follows.

In the VTR two-channel simultaneous recording apparatus according to the present invention, as shown in FIG. 2, the microcomputer 12 records two channels according to the level of the switching pulse generated from the video head drum 11 loading the tape 14. The means 40 and the two-channel reproducing means 50 are controlled, and the key operation unit 13 allows the microcomputer 12 to record two channels simultaneously on one tape.

Here, the configuration of the VTR recorder according to the present invention is composed of a first tuner (1) and a first demodulator (3) as shown in FIG. A second channel receiver 30 comprising a second tuner 2 and a second demodulator 4 for receiving any other channel, and an audio signal output from the first and second channel receivers 20 and 30. Recording audio signals output from the first and second audio recording circuits (5) and (6) and the first and second audio recording circuits (5) and (6) extracting only the audio tracks of the tape (14). Selectively switching the first and second audio recording heads 7 and 8 and the video signals output from the first and second channel receivers 20 and 30 according to the control signals of the microcomputer 12. A first switching unit 9 in operation, and a video recording circuit 10 for converting a signal output by the switching operation of the first switching unit 9 into a video signal; And a video recording head 15 for recording the output signal of the video recording circuit 10 in the video track of the tape 14.

4 is a block diagram of a playback system of the VTR according to the present invention, in which a video playback head 15a for playing back a video signal recorded on the tape 14 and a signal detected from the video playback head 15a are displayed. A video reproducing circuit 21 for converting into a signal, a second switching section 22 for transmitting an output signal of the video reproducing circuit 21 while maintaining an on / off state under the control of the microcomputer 12; A memory 23 connected to an output terminal of the second switching unit 22 to store image data of one field and output an image signal delayed by one field under the control of the microcomputer 12, and the second switching unit 22; And a third switching unit 24 connected to an output terminal of the memory 23 so as to selectively output an image signal recorded in each field under the control of the microcomputer 12, and a first of the tape 14. And first and second audio for reproducing the audio signal recorded on the second audio track. First and second audio reproduction for converting the audio heads 25 and 26 and the audio signals output from the first and second audio reproduction heads 25 and 26 so that they can be heard through the speaker sp. A fourth for selectively switching the outputs of the first and second audio reproduction circuits 27 and 28 to the speaker sp under the control of the circuits 27 and 28 and the microcomputer 12; It is provided with a switching unit (29).

On the other hand, the present invention having the configuration described above looks at the program recording process of the two-channel broadcast as follows.

First, as shown in FIG. 3, when the first and second channels CH1 and CH2 to be recorded by the key operation unit 13 and the reserved recording time are set to the same time zone, the micom 12 ) Will be recognized as recording standby.

After the set time, the microcomputer 12 enables the first and second audio recording circuits 5 and 6 to operate, and simultaneously controls the servo system to rotate the video head drum 11, and also the antenna. The broadcast frequency introduced through the ANT includes a first channel receiver 20 including a first tuner 1 and a first demodulator 2, a second tuner 3, and a second demodulator 4. The channel receiver 30 separates and outputs the first channel CH1 and the second channel CH2, respectively.

At this time, the audio signals output from the first channel CH1 and the second channel CH2 are transmitted through the first and second audio recording circuits 5 and 6 to the first and second audio recording heads 7 ( 8 is separately recorded on the first and second audio tracks A and B of the tape 14 as shown in FIG.

On the other hand, when the video head drum 11 rotates under the control of the servo system, a switching frequency of 60 Hz is generated, and the microcomputer 12 controls the first switching unit 9 according to the level of the switching frequency. It is optionally sent to the video recording circuit 10.

That is, when the switching frequency of the video head drum 11 recognized by the microcomputer 12 is at a high level, the microcomputer 12 controls the first switching unit 9 to connect to the ⓐ contact and thus the first channel. The video signal of the first channel CH1 output from the receiving unit 20 is transmitted to the recording head 15 through the video recording circuit 10, thereby to the tape 14 in one field in one frame as shown in FIG. Is recorded.

In addition, when the switching frequency of the video head drum 11 recognized by the microcomputer 12 is at a low level, the microcomputer 12 controls the first switching unit 9 to be connected to the ⓑ contact, so that the second channel receiver ( The video signal of the second channel CH2 output from 30 is transmitted to the recording head 15 through the video recording circuit 10, so that each of the other fields in one frame as shown in FIG. Is recorded.

Accordingly, the microcomputer 12 outputs the video signals of the first and second channels according to the level of the switching frequency generated from the video head drum 11 in one field within one frame as shown in FIG. CH1) and the second channel CH2 are alternately recorded in the other field, thereby simultaneously recording two channel programs as one tape at the same time.

On the other hand, the process of reproducing the program recorded in two tapes on the same tape at the same time as shown in Figure 4 as follows.

First, when a user selects a channel to be played by manipulating the key control unit 13 and issues a play command, the first and second audio reproducing circuits 27 and 28 and the third and fourth switching are performed by the microcomputer 12. The control unit 24 and 29 select only the desired channel and control the servo system, and control the servo system to the level of the switching frequency of 60 Hz generated when the video head drum 11 is rotated by the control of the servo system. Accordingly, the second switching unit 22 and the memory 23 are controlled to play only the program of the channel desired by the user.

First, assuming that the user selects the first channel CH1, the microcomputer 12 controls the third and fourth switching units 24 and 29 to connect to the contact ⓐ and at the same time the first audio reproduction circuit. The video signal recorded in the first and second fields F1 and F2 of the tape 14 is reproduced and reproduced by the video playhead 15a, and the reproduction is made. By transmitting the signal to the video reproducing circuit 21, the signal is demodulated into a complete video signal and then transmitted to the second switching unit 22. FIG.

In this case, when the switching frequency of the video head drum 11 recognized by the microcomputer 12 is at a high level, the microcomputer 12 controls the second switching unit 22 to connect the video reproducing circuit 21. Accordingly, only the video signal recorded in the first field F1, which is half of one frame shown in FIG. 5, is output, and when the switching frequency of the video head drum 11 is low level, the second switching of the microcomputer 12 occurs. The output of the video signal is stopped as the unit 22 is controlled to be in an off state and separated from the video reproducing circuit 21.

Therefore, the video signal of the first field F1 via the second switching unit 22 is output through the contact point ⓐ of the third switching unit 24, and the audio signal recorded in the first audio A is output. After playback by one audio playhead 25, the first audio play circuit 27 demodulates the original audio signal and outputs it through the contact ⓐ of the fourth switching unit 29, thereby programming the first channel CH1. Will play.

On the other hand, when the user selects the second channel CH2, the microcomputer 12 controls the third and fourth switching units 24 and 29 to connect to the ⓑ contact and at the same time the second audio reproduction circuit 28. ), The video signal recorded in the first and second fields F1 and F2 of the tape 14 is reproduced by the playhead 15a, and the reproduced signal is By transmitting to the reproduction circuit 21, the demodulated signal is transmitted to the second switching unit 22 after being demodulated into a complete video signal.

In this case, contrary to the foregoing, when the switching frequency of the video head drum 11 recognized by the microcomputer 12 is at a low level, the microcomputer 12 controls the second switching unit 22 to control the video playback circuit 21. In this case, only the video signal recorded in the second field F2 of one frame shown in FIG. 5 is outputted, and when the switching frequency of the video head drum 11 is high level, the microcomputer 12 outputs the video signal. As the second switching unit 22 is controlled to be in an off state and separated from the video reproducing circuit 21, the output of the video signal is stopped.

Therefore, the video signal of the second field F2 via the second switching unit 22 is stored in the memory 23, and when the switching frequency of the video head drum 11 is high in the microcomputer 12, the memory ( 23), the stored video signal is outputted, and the output video signal is outputted through the ⓑ contact of the third switching unit 24.

In addition, the audio signal recorded on the second audio track B is reproduced by the second audio playback head 26 and then demodulated to the original audio signal by the second audio playback circuit 28 to be the fourth switching unit 29. By outputting through the ⓑ contact of), the program of the second channel CH2 is reproduced.

As described above, the present invention selectively transmits two channels to the video circuit according to the level of the switching frequency generated from the video head drum in the microcomputer, so that the audio signals are recorded in two independent tracks, respectively. By recording video signals corresponding to one channel alternately in each field of one frame composed of two fields, two channels of broadcast programs can be recorded on one tape, so that more channels can be watched at the same time. It can satisfy the desire of the user.

Claims (2)

In a video tape recorder having a video head drum (11) for loading a tape and generating a switching frequency during rotation, so as to record a video signal of a channel tuned from an antenna or to reproduce a video signal recorded on a tape (14). A microcomputer 12 for controlling to record or reproduce two channel video and audio signals in one tape according to the level of the switching pulse generated from the video head drum 11; A first channel receiver 20 for tuning and demodulating any channel received from the antenna, a second channel receiver 30 for tuning and demodulating any other channel received from the antenna, and the first channel receiver 20 ) And a first audio recording circuit 5 and a second audio recording circuit 6 for extracting only the audio signal output from the second channel receiving unit 30, respectively, and the first audio recording circuit 5 and the second audio recording. The first audio recording head 7, the second audio recording head 8, and the control signal of the microcomputer 12 record the audio signal output from the circuit 6 to the audio track of the tape 14. A first switching unit 9 for switching so that the video signals output from the channel receiver 20 and the second channel receiver 30 are selectively output, and selectively output by the switching operation of the first switching 9 Video recording circuit 10 for converting signals into video signals Two channel recording means (40) comprising a video recording head (15) for recording an output signal output from the video recording circuit (10) on a video track of the tape (14); The video playback head 15a for reproducing the video signal recorded on the tape 14, the video reproducing circuit 21 connected to the video reproducing head 15a, and converting it into a video signal, and the control of the microcomputer 12. The second switching unit 22 which maintains the on / off state and transmits the output signal of the video reproducing circuit 21, and is connected to the output terminal of the second switching 22 and is controlled by the microcomputer 12 under one field. A memory 23 for storing video data of the video data and outputting a video signal delayed by one field, and connected to an output terminal of the second switching unit 22 and the memory 23 to each field under control of the microcomputer 12. A third switching unit 24 switched to selectively output the recorded video signal, a first audio playback head 25 for reproducing the audio signals recorded on the first and second audio tracks of the tape 14, and 2 audio playback head 26, the first audio playback head 25 and the second audio Under the control of the first audio reproducing circuit 27, the second audio reproducing circuit 28, and the microcomputer 12, which converts the audio signal output from the reproduction head 26 so that it can be heard through the sputter sp. Two channel reproducing means (50) comprising a fourth switching unit (29) for selectively transmitting the outputs of the first audio reproducing circuit (27) and the second audio reproducing circuit (28) to a speaker (sp); And a key operation unit (13) connected to the microcomputer (12) to instruct simultaneous recording of two channels. 2. The recording apparatus according to claim 1, wherein the two-channel recording means 40 records audio signals on two separate tracks on each channel on one tape, and the video signal is composed of one frame composed of two fields. A two-channel simultaneous recording apparatus of a video tape recorder, characterized by alternately recording a video signal corresponding to one channel for each field.