JPH09163283A - Video tape recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain long time recording by allowing the AV mode and the A mode to coexist on a same recording medium so as to attain continuous recording/reproduction. SOLUTION: A chroma signal processor 14 and a luminance signal processor 15 apply optimum processing to a video signal and optimum processing is applied to an audio signal by a compression circuit 16 and an AFM processor 20. Outputs from the luminance signal processor 15 and the compression circuit 16 are given to an FM modulation circuit 19 via a switch circuit 18 to apply frequency modulation. An adder 21 adds outputs of a chroma signal processor 14, the FM modulation circuit 19 and the AFM processor 20. The result of sum is recorded on a magnetic tape 5 via a recording head 4. The control above is conducted by a system controller 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder suitable for use in recording audio and video at a lecture, for example.

[0002]

2. Description of the Related Art Conventionally, a camera-integrated VTR (video tape recorder) can easily enjoy photographing indoors and outdoors.

[0003]

However, in the case where a VTR with a built-in camera is used to take pictures of a lecture or the like over a long period of time, a plurality of video tapes, which are recording media, are required. However, for images with little movement such as lectures, only a part of the images is sufficient, whereas all the images must be continuously recorded in order to obtain the required sound. Further, when playing back the recorded video tape, there is a problem that it is difficult for the user to quickly find a desired scene.

Therefore, the object of the present invention was made in consideration of the above points, and it is possible to record only an audio signal in an area in which a video signal and an audio signal are simultaneously recorded on a recording medium. It is to propose a VTR capable of continuously recording / reproducing different signals.

[0005]

According to a first aspect of the present invention, there is provided a video tape having a first recording mode for simultaneously recording a video signal and an audio signal and a second recording mode for recording only an audio signal. In the recorder, a control means for generating a control signal for switching between the first recording mode and the second recording mode, and the first and second recording modes are appropriately switched according to the control signal, and the first and second recording modes are set on the recording medium. A video tape recorder comprising: a recording unit for continuously recording a series of information while temporally mixing two recording modes.

By recording only the audio signal in the area where the video signal and the audio signal of the magnetic tape are simultaneously recorded, it is possible to record for a long time, and by switching the AV mode and the A mode, the minimum necessary You can record only the video,
It is easy to record / reproduce these continuously.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The description of the present invention will be given in the following order. (1) Camera-integrated VTR that can also record only audio (1-1) AV mode recording and playback (1-2) A mode recording and playback (1-3) When changing from AV mode to A mode during recording (1-4) When moving from A mode to AV mode during recording (1-5) Playback when moving from AV mode to A mode (1-6) Playback when moving from A mode to AV mode (2) Lecture Optimal VTR with integrated camera for recording (2-1) Recording mechanism (2-2) Operation buttons (2-3) Recording example of video signal and audio signal or audio signal only (2-4) Video signal And mechanism of reproducing only audio signal or audio signal (2-5) Display of various time information during recording (3) Other embodiments

(1) Camera-integrated VTR capable of recording only voice FIG. 1 shows a first embodiment of the configuration of the camera-integrated VTR of the present invention. The video signal V from the video camera 1 and the audio signal A from the microphone 2 are recorded on the magnetic tape 5 via the recording unit 3 and the recording head 4 as shown in FIG. 2, and the recorded video signal V is Tape 5 to playback section 7
The recorded audio signal A is output from the output terminal 8 via the output terminal 9 via the reproducing unit 7 from the magnetic tape 5. The recording controller 3, the reproducing unit 7, the drum servo circuit 12, and the capstan servo circuit 13 are controlled by the system controller 10 according to instructions from the operation buttons 11. A mode for recording the video signal V and the audio signal A is called an AV mode, and a mode for recording only the audio signal A is called an A mode.

The recording unit 3 includes a chroma signal processor 14,
Luminance signal processor 15, compression circuit 16, buffer memory 17, switch circuit 18, FM modulation circuit 19 and A
It is composed of the FM processor 20. The chroma signal processor 14 is supplied with the chroma signal from the video camera 1 and is subjected to processing such as LPF, AGC and pre-emphasis. The chroma signal is output to the adder 21. A luminance signal is supplied from the video camera 1 to the luminance signal processor 15, and processing such as LPF, AGC, and pre-emphasis is performed. The brightness signal is supplied to the switch circuit 18.

The audio signal A supplied from the microphone 2 is supplied to the compression circuit 16 and the AFM processor 20.
In the compression circuit 16, the audio signal A is compressed by ATRAC or the like, an error correction code is added, and the audio signal A is supplied to the buffer memory 17. In the AFM processor 20, the supplied audio signal A is output as an AFM (FM audio) to the adder 21 so that the audio signal A can be reproduced even by using the conventional VTR, and is simultaneously recorded. The buffer memory 17 outputs the audio signal A recorded according to the instruction of the system controller 10 to the switch circuit 18.

The switch circuit 18 switches the supplied luminance signal and audio signal A and supplies them to the FM modulation circuit 19. The FM modulation circuit 19 FM-modulates the luminance signal and the audio signal A and supplies them to the adder 21. In the adder 21, the FM-modulated signal, the chroma signal and A
FM is mixed and the addition result is recorded on the magnetic tape 5 via the recording head 4. That is, the audio signal A is placed on the invalid line of the video signal V and recorded on the magnetic tape 5 through the YFM modulator.

The data recorded on the magnetic tape 5 is reproduced by the reproducing head 6, and the reproduced signal is supplied to the chroma signal processor 22 and the FM demodulation circuit 23. The chroma signal processor 22 extracts the chroma signal from the reproduced signal and performs processing such as de-emphasis and LPF on the chroma signal. The processed chroma signal is supplied to the adder 25. The FM demodulation circuit 23 extracts the luminance signal and the audio signal A from the reproduced signal, the luminance signal is supplied to the luminance signal processor 24, and the audio signal A is supplied to the buffer memory 27.

In the luminance signal processor 24, the extracted luminance signal is subjected to processing such as de-emphasis and LPF, and the luminance signal is supplied to the adder 25. In the adder 25, the chroma signal and the luminance signal are added,
The addition result is supplied to the delay circuit 26 as the video signal V. According to the instruction from the system controller 10, the delay circuit 26 outputs the supplied video signal V from the output terminal 8. In the buffer memory 27 to which the audio signal A is supplied, the audio signal A is supplied to the decompression circuit 28 according to the instruction from the system controller 10. The expansion circuit 28 expands the supplied audio signal A, and the expanded audio signal A is output from the output terminal 9.

A detailed block diagram of the drum servo circuit 12 is shown in FIG. During recording, a vertical synchronizing signal generated from the video signal V input from the input terminal 31 is supplied, and the synchronizing signal is supplied to one terminal of the switch 33. In the phase comparison circuit 34, the vertical synchronization signal supplied via the switch 33 and the pulse signal from the frequency divider (1 / N) 39 are compared in phase, and the pulse signal of the comparison result is supplied to the LPF 35. To be done. After the filtering process of the LPF 35, the drum motor 36 controls the rotation of the drum 37 according to the supplied pulse signal. Drum 3
A pulse signal is generated in the pulse generator (PG) 38 according to the rotation of 7, and the pulse signal is generated by the frequency divider (1 /
N) The frequency is divided at 39. The divided pulse signal is supplied to the phase comparison circuit 34. Further, at the time of reproduction, a synchronization signal generated from the video signal V reproduced from the input terminal 32 is supplied and the same processing is performed.

(1-1) Recording and Reproduction in AV Mode First, recording in AV mode will be described. In FIG. 2, A
The tape pattern of V mode is shown. In the AV mode, one frame (33.33 [msec]) of the video signal V is divided into two tracks and recorded. Therefore, at the time of recording, the drum servo circuit 12 shown in FIG. 3 is phase-locked with the vertical synchronizing signal generated from the input video signal V and rotates. At this time, the drum servo circuit 12 forms one track by 1/2 rotation.

Next, the capstan servo circuit 13 during recording will be described in detail with reference to FIG. The synchronization signal from the input terminal 41 is supplied from the capstan and then supplied to the frequency divider (1 / M) 44. The input terminals 42 and 43 are connected to the signal S1 from the system controller 10,
S2 is supplied to the frequency divider 44. here,
Since the recording is in the AV mode, signals S1 and S2 are set so that M = 1, and the speed is controlled to a constant speed. Therefore, the track pitch can be kept accurate.

The frequency-divided sync signal is supplied to the phase comparison circuit 45.
Supplied to The phase comparison circuit 45 performs phase comparison between the frequency-divided synchronization signal and the pulse signal from the frequency generator (FG) 48, and the pulse signal of the comparison result is the LP signal.
It is supplied to F46. After filtering by the LPF 46,
The rotation of the capstan motor 47 is controlled according to the supplied pulse signal. In response to the rotation of the capstan motor 47, the frequency generator 48 generates a pulse signal, and the pulse signal is supplied to the phase comparison circuit 45.

FIG. 5 shows a second embodiment for reproducing a magnetic tape recorded by a conventional 8 mm camera-integrated VTR. The camera-integrated VTR shown in FIG. 5 has a conventional 8
It is possible to reproduce the magnetic tape recorded by the VTR with a built-in millimeter camera. Specifically, the reproduction signal from the reproduction head 6 is supplied to the AFM demodulation circuit 51, and the AFM demodulation circuit 51 demodulates the AFM (FM audio). The demodulated AFM is supplied to the switch 52.
The AFM is output from the output terminal 9 via the switch 52 under the control of the system controller 10.

Next, reproduction in the AV mode will be described. The drum servo circuit 12 shown in FIG. 3 is locked to the reference vertical sync pulse. Further, FIG. 6 is used for a detailed description of the capstan servo circuit 13 at the time of reproduction. A reproduction signal is read from the magnetic tape 71 via the reproduction head 72. The read reproduction signal is transferred to the A
The ATF signal is supplied to the TF detection circuit 74, and the ATF signal is detected from the supplied reproduction signal. The detected ATF signal is L
It is supplied to the capstan motor 76 via the PF 75. That is, the capstan motor 76 causes the AT
Tracking control is performed so that the crosstalk from the left and right tracks of the F signal becomes equal. This allows
The playhead 72 can trace directly above all tracks.

(1-2) Recording and Reproduction in A Mode First, recording in A mode will be described. At this time, the drum servo circuit 12 is the same as in the AV mode. The video signal V is unnecessary, but the vertical synchronizing signal for the drum servo circuit 12 is necessary. The audio signal A is the video signal V
The data amount is about 1/10 to 1/30 times. Therefore, if recording is performed on all areas of each track, the audio signal A for 10 to 30 tracks can be recorded on one track.

Here, for the sake of simplicity, it is assumed that the audio signal A which can be recorded in one track is 21 times as large as the normal one.
The tape speed is 1/21 times that of the AV mode, and the drum may form one track every 21/2 rotations. Therefore, the tape pattern has an inclination almost close to the still angle, and the tape pattern in the A mode is a full audio track as shown in FIG. 7, which is a pattern different from the AV mode. The tape speed makes the reference frequency of the capstan servo circuit 13 1/21 times.

Next, reproduction in the A mode will be described.
When reproducing the A mode, one tape is traced many times because the tape speed is 1/21 times the normal speed. Therefore, it is possible to obtain correct data by seeing the output signal of the error detection and accumulating until the error is minimized. The capstan servo circuit 13 is applied so that the accumulated amount in the buffer memory 27 during reproduction is close to a predetermined position within the D range. That is, when the data amount in the buffer memory 27 increases, the tape speed is slowed, and when the data amount decreases, the tape speed is increased, so that the data amount in the buffer memory 27 can be maintained at a predetermined value.

(1-3) Transition from AV mode to A mode during recording The transition from AV mode to A mode during recording will be described. An embodiment of the time chart of the present invention is shown in FIG. First, FIG. 8A shows the tape pattern, and FIG. 8B shows the tape speed. Further, FIG. 8C shows the data amount of the buffer memory 17 at the time of recording. At the time of t1, when the AV mode is turned off while the A mode is kept on, the AV is turned off for a period (t2) of several frames.
Record the mode. Numbers are assigned to the tracks for several frames. . . Record as 4, 3, 2, 1. This is used for recognizing the last track in AV mode during reproduction.

When the last track in the AV mode has been written, the capstan motor 47 is controlled so that the speed becomes 1/11, which is about twice the speed of 1/21 (t).
3). Since about 0.1 second of this period (t3) cannot be recorded on the magnetic tape, the continuously input audio signal A is accumulated in the buffer memory 17 (t4). After about 0.1 seconds,
That is, when the tape speed becomes 1/11, the recording is started at the rate of 1 track per 11/2 rotation of the drum (t5). The track pitch at this time is almost equal to the normal value.

Since the recording is performed at a density twice as high as the steady value in the A mode, the audio signal A stored in the buffer memory 17 is recorded.
Decreases (t6). Immediately before the buffer memory 17 becomes empty, the tape speed is set to 1/21 times the AV mode (t
7) Recording is performed at a rate of 1 track per 21/2 rotations of the drum. This is the steady state (t8) of the A mode.

(1-4) Transition from A mode to AV mode during recording The transition from A mode to AV mode during recording will be described. In the steady state of the A mode (t8), that is, when recording in the A mode, when the recording in the AV mode is turned on, the end mark is recorded together with the last track of the A mode (t9). After recording the last track of the A mode, the capstan motor 47 is accelerated to the normal speed all at once (t10). While the tape speed is increasing, the drum is recorded at a rate of 1 track per 1/2 rotation (t
11). The data recorded at this time is dummy data together with the dummy mark, which is used for tracking servo during reproduction.

Since data cannot be recorded in this section (t11) of about 0.1 seconds, the buffer memory 1
The audio signal A is stored in 7 (t12). Before the buffer memory 17 becomes full, the full audio track shown in FIG. 7 is recorded (t13). At this time, since the recording is performed at a density of about 21 times, the amount of data accumulated in the buffer memory 17 sharply decreases (t14). Immediately before the amount of data in the buffer memory 17 becomes empty, the track is switched to the AV mode track (t15). The video signal V is recorded from here.

(1-5) Reproduction when changing from AV mode to A mode The reproduction when changing from AV mode to A mode will be described. FIG. 8D shows the success or failure of tracking during reproduction,
FIG. 8E shows the amount of data in the buffer memory 27. Further, FIG. 8F shows the data amount of the buffer memory (hereinafter referred to as the buffer memory 26) included in the delay circuit 26, and FIG. 8G shows the delay time of the delay circuit 26. Since the buffer memories 26 and 27 for the video signal V and the audio signal A are brought into the full state after the AV mode is reproduced, the output of the respective signals is slightly delayed (t16). A
After reading the last track in the V mode, the tape speed is reduced to about 1/11 times and the A mode track is waited (t17). At this time, since no signal is obtained until the A-mode data is reproduced, the amount of data in the buffer memories 26 and 27 decreases.

When the reproduction of the A mode track is approached, one tape is reproduced many times because the tape speed is low. Therefore, accurate data can be read without controlling tracking. Here, since the density is recorded at about twice the steady value in the A mode, the data amount in the buffer memory 27 increases (t18). When the track recorded at about twice the steady value is finished, the tape speed is set to the steady value in the A mode (t19). At this time, the buffer memory 27 holds the data for approximately 0.1 seconds. The capstan servo circuit 13 during reproduction is controlled so that the data amount in the buffer memory 27 becomes constant.

(1-6) Reproduction when changing from A mode to AV mode Next, reproduction when changing from A mode to AV mode will be described. Data is not reproduced for about 0.1 seconds after the last track in the A mode has been read, so the data amount in the buffer memory 27 decreases (t20). Since the track t11 containing the dummy data appears, the tracking is locked (t21). Next, when the full audio track (t13) is detected, this data is stored in the buffer memory 27. Since the data density is 21 times higher, the buffer memory 27 rapidly increases (t22).

Next, the AV mode track is reproduced, but the video signal V is delayed by the delay circuit 26 in order to match the timing of the video signal V and the audio signal A (t23).
After that, the video mute is released and output (t24).
In this way, the audio signal A is continuously reproduced for a moment without interruption between t16 and t24.

The delay circuit 26 described above is necessary for synchronizing the times of the video signal V and the audio signal A, but FIG. 9 shows a third embodiment in which this function is realized by another method. The video reproduction head 53 performs reproduction processing of the video signal V, and the audio reproduction head 54 located a few tracks ahead of the video reproduction head 53 performs reproduction processing of the audio signal A. The video signal V from the video reproducing head 53 is supplied to the video signal V processor 55. In the video signal V processor 55, de-emphasis and LPF are applied to the extracted video signal V.
The video signal V is output from the output terminal 8 under the control of the system controller 10.

The audio signal A from the audio reproducing head 54 is supplied to the switch circuit 56. The switch circuit 56 is controlled by the system controller 10, and is controlled by the buffer memory 27 or the system controller 1.
The audio signal A is supplied by switching 0. Audio signal A
The audio signal A is supplied to the decompression circuit 28 in accordance with the instruction from the system controller 10 in the buffer memory 27 to which the signal is supplied. The expansion circuit 28 expands the supplied audio signal A, and the expanded audio signal A is output from the output terminal 9.

In this system, since the video signal V from the video reproducing head 53 and the audio signal A from the audio reproducing head 54 are output almost in synchronization, the delay circuit 26 becomes unnecessary. Instead, as shown in the figure, a reproducing head and reproducing signal processing are required for two systems.

According to the above configuration, when the AV mode recording is turned on / off during the A mode recording, the audio signal A
Can be played without any momentary interruptions. If a magnetic tape capable of recording for 1 hour in AV mode is used, recording can be performed for 10 to 30 hours when recording only in A mode. Also, AV
The modes can be mixed and recorded, and the recording time at this time is 1 hour or more, although it is determined by the ratio of the time of the AV mode and the time of the A mode. In other words, the A-mode recording consumes almost no magnetic tape and can be handled at the same intervals as in the stopped state.

(2) Camera-integrated VTR best suited for recording at lectures, etc. This camera-integrated VTR has a small amount of movement of the subject, as in academic lectures, so images can be recorded here and there. I want to record all parts. In addition, in a long lecture, etc., it is necessary to record on many magnetic tapes, which is not convenient. Furthermore, a camera-integrated VTR in consideration of such things as taking a long time to find a part required by the user during reproduction will be described.

(2-1) Recording Mechanism In the AV mode, the video signal V (luminance signal and color signal) V and the audio signal A (AFM: FM audio signal) A are used in the same format as the conventional 8 mm camera integrated VTR. However, the audio signal A and the sub-code, which are further digitized and compressed, are time-division multiplexed on the invalid line of the luminance signal of the video. In the A mode, a single track is digitalized, and a compressed audio signal A and a subcode are recorded by time division multiplexing. The digital audio signal A has a data amount of 1/10 to 1/30 times that of the video signal. For this reason, the tape speed can be considerably slowed down, and the recording time becomes extremely long.

A mark indicating the A mode is recorded on the A mode track. When reproducing, a track in A mode and a track in AV mode are distinguished by the presence or absence of a mark. In addition, when transitioning between the A mode and the AV mode, the audio signal A can be continuously reproduced. AV
The compressed digital audio signal A of the mode is FM-modulated together with the luminance signal and recorded on the invalid line of the luminance signal of the video. However, as in the AV mode, the compressed digital audio signal A in the A mode can be FM-modulated and recorded on all lines of the video luminance signal. Also, unlike the AV mode, it is possible to perform high-density recording suddenly in the form of EFM. A block diagram of the latter case is shown in FIG.

The system shown in FIG. 10 is the fourth embodiment of the present invention.
And helps to further reduce tape consumption in A-mode. Specifically, the reproduction signal from the reproduction head 6 is supplied to the digital audio demodulation circuit 60, and the digital audio demodulation circuit 60 demodulates the digital audio and outputs the audio signal A as the switch 6
1 is supplied to the A terminal. The switch 61 is controlled by the system controller 10, and the AV of the switch 61 is controlled.
The audio signal A supplied from the FM demodulation circuit 23 and the A terminal are switched. Audio signal A from switch 61
Are supplied to the buffer memory 27. The buffer memory 27, to which the audio signal A is supplied, is supplied with the audio signal A to the decompression circuit 28 according to an instruction from the system controller 10. The expansion circuit 28 expands the supplied audio signal A, and the expanded audio signal A is output from the output terminal 9.

(2-2) Operation Buttons Here, FIG. 11 shows an example of the operation buttons of the camera-integrated VTR. The button 81 is a button for turning on / off the recording in the A mode, the button 82 is a button for turning on / off the recording in the AV mode, and the button 83 is a button for turning on / off the camera. . The button 84 is a button for performing continuous reproduction, and by pressing this button 84, continuous reproduction of data recorded in the A mode and the AV mode is performed.

The button 85 is a button for rewinding, and the button 86 is a button for fast-forwarding. The button 87 is a button for performing skip reproduction, and by pressing this button 87, reproduction in, for example, AV mode only is performed. The button 88 is a button for stopping the reproduction. The button 89 is a button for switching the instantaneous display of recording.

The button 90 is a button for skipping to the beginning of the next AV mode. Button 91 is the next A
It is a button to skip to the beginning of the mode. The button 92 is a button for skipping to the change point of the next mode. The button 93 is a button for skipping to the beginning of the previous AV mode. Button 94 is the previous A
It is a button to skip to the beginning of the mode. The button 95 is a button for skipping to the change point of the previous mode. When these buttons 90 to 95 are pressed twice or more, each mode change point is skipped by the number of times of pressing.

The button 96 sets the maximum skip amount of one time to 2
This is a button for limiting to the minute, and when the designated skip position is more than 2 minutes away, the playback mode is set at the point of 2 minutes, and the same instruction is given again, and the first desired skip is performed. It becomes possible to move to a position. The button 97 is a button for limiting the maximum skip amount for one time to 5 minutes, and has the same function as the button 96. The button 98 is a button for not limiting the skip in terms of time.

(2-3) Recording Example of Video Signal and Audio Signal or Audio Signal Only Example of mixed area of A mode and AV mode
It is shown in FIG. First, as shown in FIG. 12A, the recording button "A" in the A mode is pressed to turn it on. At this time, recording of only the audio signal A starts. Next, the recording button "V" in the AV mode is pressed to turn it on. Then, the video signal V and the audio signal A are recorded. The AV mode is turned off by pressing the record button "V". Although the AV mode is turned off, the A mode remains on, so that only the audio signal A is continuously recorded. When the recording button “V” is pressed as necessary and the AV mode is repeatedly turned on / off, the video signal V is intermittently recorded, but the audio signal A is continuously recorded. When both the recording buttons "A" and "V" are turned off, the recording is stopped.

(2-4) Mechanism of Playback of Video Signal and Audio Signal or Audio Signal Only FIG. 12B shows a tape playback state in which skip playback of the button 87 is performed, and FIG. The following shows the state of tape playback in which continuous playback is performed. First, FIG.
As shown in FIG. 2C, when the button 84 is pressed, a normal image can be viewed in the AV mode area. And
In the area of the A mode, the screen displaying the image becomes either a gray screen or the last still picture (or the still picture specified by the user at the time of reproduction), and only the audio signal A is reproduced. In the playback AV mode area, normal video playback is performed.

Further, in FIG. 12B, when the button 87 is pressed, the AV mode area is reproduced as it is. The area of the A mode becomes a gray screen, the fast forward is performed to the beginning of the next AV mode, and then the normal reproduction is performed. When it becomes the A mode area again, the A mode area becomes a gray screen, the fast forward is performed to the beginning of the next AV mode, and then the normal reproduction is performed, and this is repeated. Therefore, FIG.
As shown in, only the AV mode area can be seen in a short time.

(2-5) Display of various time information at the time of recording The recording time from the mounting of the magnetic tape to the present is displayed. For example, when the recording time in the A mode is 1 hour and the recording time in the AV mode is 30 minutes, “A mode 1H00
“M” and “AV mode 0H30M” are displayed. In order to show the consumption amount of the magnetic tape, the total time converted into the AV mode is calculated and displayed from the recording time in the A mode and the recording time in the AV mode. Here, when the tape speed in the A mode is 0.1 times that in the AV mode, it can be calculated by (recording time in A mode) × 0.1 + (recording time in AV mode). Therefore, "AV mode 0H36M" is displayed.

Furthermore, the time when the remaining amount of the magnetic tape is recorded in the AV mode and the time when the entire amount of the magnetic tape is recorded in the A mode are respectively obtained and displayed. By the way, the length of the AV mode of the magnetic tape is set to 1 hour (1H). In the case of recording all in AV mode, it is calculated by (1H)-(total recording time converted to AV mode), and "0H24
M ”is displayed. In addition, the time when recording all in A mode is calculated by (time when recording all remaining tapes in AV mode) × 10, and is “4H00M”.
Is displayed.

Further, the remaining time when recording to the end at the ratio of the A mode and the AV mode up to the present is calculated from the recording time of the A mode and the recording time of the AV mode, and "A mode 0H40M" and "AV mode 0H20M" are calculated. Is displayed.
At this time, if A mode recording time = A, AV mode recording time = AV, A mode remaining recording time = X, and AV mode remaining recording time = Y,

A / AV = X / Y (1) AV + Y + 0.1 × (A + X) = 1H (2)

Y = (1H− (AV + 0.1 × A)) / (1 + 0.1 × A / AV) (3) X = (A / AV) × Y (4) This time information can be freely selected and displayed.

(3) Other Embodiments In the above embodiments, the video tape is used as the recording medium, but the present invention is not limited to this, and a recording medium other than the video tape, for example, recording. A reproducible video disk or semiconductor memory may be used.

Further, in the above-described embodiment, the one used for academic lectures and the like has been described, but the present invention is not limited to this, and a scene is recorded when a presentation using an OHP or a slide projector is recorded. The image may be recorded only when it changes. In addition, not only for lectures but also for recording various kinds of concerts, by occasionally inserting videos, it also functions as a long-time recorder.

[0054]

According to the present invention, the video signal V of the VTR is
It is possible to record / reproduce the audio signal A in the area where is recorded.

According to the present invention, the AV mode for simultaneously recording the video signal V and the audio signal A and the A mode for recording only the audio signal A are mixed and recorded / recorded on the same magnetic tape. It becomes possible to reproduce.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a camera-integrated VTR of the present invention.

FIG. 2 is a schematic diagram showing a tape pattern in AV mode.

FIG. 3 is a block diagram required for an example of a drum servo according to the present invention.

FIG. 4 is a block diagram of an example of a capstan motor according to the present invention.

FIG. 5 is a block diagram showing a second embodiment of the camera-integrated VTR of the present invention.

FIG. 6 is a schematic diagram showing an A-mode tape pattern.

FIG. 7 is a schematic diagram showing an example of an A-mode full audio track according to the present invention.

FIG. 8 is a timing chart used for explaining one embodiment of A mode recording / reproducing and AV mode recording / reproducing according to the present invention.

FIG. 9 is a block diagram showing a third embodiment of the camera-incorporated VTR according to the present invention.

FIG. 10 is a block diagram showing a fourth embodiment of the camera-integrated VTR of the present invention.

FIG. 11 is a schematic diagram showing an example of operation buttons according to the present invention.

FIG. 12 is a timing chart showing an example of the areas of the A mode and the AV mode of the present invention.

[Explanation of symbols]

 1 Video Camera 2 Microphone 3 Recording Section 4 Recording Head 5 Magnetic Tape 6 Playback Head 7 Playback Section 10 System Controller 11 Operation Button 12 Drum Servo Circuit 13 Capstan Servo Circuit 14, 22 Chroma Signal Processor 15, 24 Luminance Signal Processor 16 Compression Circuit 17, 27 Buffer memory 19 FM modulation circuit 20 AFM processor 23 FM demodulation circuit 26 Delay circuit 28 Expansion circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location H04N 5/92 H04N 5/782 Z 5/91 C 5/92 H

Claims (11)

[Claims] 1. A video tape recorder having a first recording mode for simultaneously recording a video signal and an audio signal, and a second recording mode for recording only an audio signal, wherein the first recording mode and the second recording mode. Control means for generating a control signal for switching the recording mode, and the first and second recording modes are appropriately switched according to the control signal to temporally switch the first and second recording modes on the recording medium. A video tape recorder, comprising: a recording means for continuously recording a series of information while being mixed. 2. The video tape recorder according to claim 1, wherein the recording means records the first recording in the video signal and the audio signal when the first recording mode is selected by the control signal. A video tape recorder characterized in that mode identification data is added and recorded, and when the second recording mode is selected, the second recording mode identification data is added and recorded to the audio signal. . 3. The video tape recorder according to claim 2, further comprising a first switch for selecting the first recording mode and a second switch for selecting the second recording mode. The recording means has the operation section, and when the first and second recording modes are simultaneously selected by the first and second switches,
The video tape recorder is characterized in that the recording operation is stopped when the recording is performed in the recording mode, and the recording operation is stopped when neither the first recording mode nor the second recording mode is selected by the first switch. 4. The video tape recorder according to claim 1, wherein the time information that can be recorded on the remaining portion of the recording medium is recorded only in the first recording mode and only in the second recording mode. A video tape recorder provided with a display means for displaying in three types of a case of recording and a case of recording the first and second recording modes in a mixed manner. 5. The video tape recorder according to claim 1, wherein the magnetic medium recorded in the first recording mode is 8
A video tape recorder capable of being reproduced by a millimeter video tape recorder, and the magnetic medium recorded by the 8 millimeter video tape recorder can be reproduced in the same manner as in the first recording mode. . 6. The video tape recorder according to claim 1, wherein, in the first recording mode, compressed digital audio data is recorded on an invalid line before or after a vertical synchronizing signal. Tape recorder. 7. The video tape recorder according to claim 1, wherein, in the second recording mode, compressed digital audio data is recorded on almost all lines except a vertical synchronizing signal. . 8. The video tape recorder according to claim 1, wherein the second recording mode directly records compressed digital audio data. 9. The video tape recorder according to claim 1, wherein a video signal delay circuit is used for time adjustment of the video signal and the audio signal. 10. The video tape recorder according to claim 1, wherein a preceding head dedicated to reproduction of the audio signal is provided for time adjustment of the video signal and the audio signal. 11. The video tape recorder according to claim 1, wherein a continuous reproduction mode for continuously reproducing the series of information,
Selecting means for selecting a skip reproducing mode for selectively reproducing only a first recording mode portion discretely existing on the recording medium; and reproducing means for reproducing the recording medium based on an instruction from the selecting means. A video tape recorder comprising: