JPH08185673A - Video tape recorder - Google Patents

Abstract

PURPOSE: To continuously record a series of information including voice for a long time by changing over a mode AV of simultaneously recording a video signal and a voice signal and a mode A of recording only the voice signal by a control signal and making them coexist with each other timewise. CONSTITUTION: A camcorder changes over the AV mode and the A mode respectively recording the video and the voice from a video camera 2 and a microphone 3 simultaneously and only the voice in a tape 4 by the control signal. A system controller(SC) 10 outputs the control signal adequately in accordance with the operation of an operation button and a recording part 5 makes the AV mode and the A mode coexist timewise according to the control signal. Moreover, the SC10 makes a video and voice AV and a voice V output by controlling a drum servo 8 and a capstan servo 9 and by controlling a reproducing part 7 at the time of a reproducing. Thus, this recorder can execute the recording for 10 to 20 hours when the mode is only the A mode and can effectively record a lecture, etc., for a long time when both modes coexist by using a tape for one hour when it is used in the AV mode.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Technology Problem to be Solved by the Invention (FIG. 1) Operation (FIG. 1) Example (1) Camcorder (FIG. 1 and FIG. 2) that Can Record Only Voice (1-1) AV Mode Recording and reproduction (Figs. 1 to 5) (1-2) Recording and reproduction in A mode (Figs. 1 and 6) (1-3) At the time of shifting from AV mode to A mode (Figs. 1 and 7) ) (1-4) During recording When changing from A mode to AV mode (Figs. 1 and 7) (1-5) Playing when changing from AV mode to A mode (Figs. 1 and 7) (1-6) Playback when moving from A mode to AV mode (Figs. 1 and 7) (2) Optimal camcorder for recording at lectures, etc. (2-1) Mechanism of recording (2-2) Recording image and sound or sound only Example (Fig. 8) (2-3) Mechanism of playing back images and sound or only sound (Fig. 8) (2-4 ) Skip button during playback (Fig. 9) (2-5) Display of various time information during recording (3) Other embodiments Effect of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder, and is preferably applied to a video tape recorder used for recording audio and video at a lecture, for example.

[0003]

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

[0004]

By the way, in the case where a videotape recorder with a built-in camera is used to photograph all of a long-term lecture or the like, a plurality of videotapes as recording media are required. However, for images with little movement such as lectures, only a part of the images is sufficient, whereas all images must be continuously recorded in order to obtain the required sound. In addition, when playing back a recorded video tape, it is difficult for the user to quickly find a desired scene.

The present invention has been made in consideration of the above points, and an object thereof is to propose a video tape recorder capable of recording a recording medium in which only audio is mixed for a long time.

[0006]

In order to solve such a problem, the present invention has 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. Video tape recorder (1)
In (1), the control means (10) for generating a control signal for switching between the first recording mode and the second recording mode and the recording mode are appropriately switched according to the control signal, and the first recording is performed on the recording medium (4). A recording means (5) is provided for continuously recording a series of information while temporally mixing the mode and the second recording mode.

[0007]

In the video tape recorder (1) having the first recording mode for simultaneously recording the video signal and the audio signal and the second recording mode for recording only the audio signal, the first recording mode and the second recording mode are provided. The control means (10) for generating a control signal for switching the recording mode and the recording mode are appropriately switched according to the control signal, and the first recording mode and the second recording mode are temporally switched on the recording medium (4). By providing the recording means (5) for continuously recording a series of information while being mixed with each other, it is possible to record a recording medium in which only audio is mixed for a long time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Camcorder capable of recording audio only In FIG. 1, reference numeral 1 indicates the overall structure of a video tape recorder integrated with a camera of the present invention. The camera-integrated video tape recorder 1 reproduces the audio and / or video recorded on the tape 4, and the recording unit 5 for recording the video and audio from the video camera 2 and the microphone 3 on the tape 4 as a recording medium. And a reproducing section 7 for By the way, the mode for recording images and sound is the AV mode, and the mode for recording only sound is the A mode.

The recording unit 5, the reproducing unit 7, the drum servo 8 and the capstan servo 9 are controlled by a system controller 10, respectively. The structure of the drum servo 8 is shown in FIG.

(1-1) Recording and Reproduction in AV Mode First, recording in AV mode will be described. In FIG. 3, A
The tape pattern of V mode is shown. In the AV mode, one frame (33.33 [msec]) of a video signal is distributed to N tracks and recorded. For this reason, the drum servo 8 shown in FIG. 2 rotates in phase with the frame signal of the frame pulse generated from the input video. At this time, the drum servo 8 forms one track with 1/2 rotation.

The capstan servo 9 shown in FIG. 4 switches modes according to signals S1 and S2 from the system controller 10. Since the recording is in the AV mode here, the 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. Audio data is 33.3 [mse
It is divided every 1 / N of c] and is recorded in an area different from the video data of each track.

Next, reproduction in the AV mode will be described. The drum servo 8 shown in FIG. 2 locks the reference frame pulse. As shown in FIG. 5, the tracking is AT
At F, the capstan motor 11 is controlled so that the crosstalk from the left and right tracks becomes equal. This causes the head to trace directly above all tracks.

(1-2) A mode recording and reproduction First, the A mode recording will be described. At this time, the rotation of the drum servo 8 is 1/2 rotation, which is the same as in the AV mode. No video signal is required, but a frame pulse for the drum servo 8 is required. The amount of audio data is about 1/10 to 1/20 of that of video data. Therefore, if you record in the video area of each track, it will be 10 ~ with one track.
Audio data for 20 tracks can be recorded.

Here, the audio data is 1 / the video data.
Described as 10. The tape speed is 1/11 of the AV mode, and the drum should form one track in 11/2 rotations. Therefore, the tape pattern has an inclination almost close to the still angle, and as shown in FIG. 6, the tape pattern in A mode is different from that in AV mode. The tape speed makes the reference frequency of the capstan servo 9 1/11. By the way, when recording in A mode, M = 10-20.

Next, reproduction in the A mode will be described.
Since the tape speed is 1/11 of the normal speed when reproducing in the A mode, one track is traced many times. Therefore, it is possible to obtain correct data by seeing the error detection output and accumulating until the error is minimized. The capstan servo 9 can be applied so that the amount of storage in the buffer memory 12 during reproduction is near a predetermined position within the D range.
That is, when the amount of data in the buffer memory 12 increases, the tape speed is delayed, and when the amount of data decreases, the tape speed is increased to keep the data amount in the buffer memory 12 at a predetermined value.

(1-3) Transition from AV mode during recording to A mode The transition from AV mode during recording to A mode will be described. 7 (A) and 7 (B) show the time chart of the tape pattern and the tape speed. Further, FIG. 7C shows the data amount of the buffer memory at the time of recording. At t1 of the time chart, when the AV mode is turned off while the A mode is on, 2 frames (t2) from that time
Records in AV mode. Numbers are recorded in the tracks for these two frames as 20, 19, ..., 2, 1. This is used to recognize the final track in the AV mode during reproduction.

When the last AV track has been written, the capstan motor is hit with a speed of 1/11, which is about twice the speed of 1/5.
(T3). Since the tape data cannot be recorded for about 0.2 seconds during this period, audio data that is continuously input is accumulated in the buffer memory 13 (t4). about
After 0.2 seconds, that is, when the tape speed reaches 1/5, recording is started at a rate of 1 track for every 5/2 rotations of the drum (t5). At this time, the track pitch is almost equal to the normal value.

Since the data is recorded at a density twice as high as the steady value in the A mode, the data stored in the buffer memory 13 decreases (t6). Immediately before the buffer memory 13 becomes empty, the tape speed is set to 1/11 of the AV mode (t7), and recording is performed at a rate of 1 track per 11/2 rotation of the drum. This is A
The mode is in the steady state (t8).

(1-4) Transition from recording A mode to AV mode The transition from recording A mode to AV mode will be described. When recording in the steady state t8 of the A mode, that is, in the A mode, when the recording in the AV mode is turned on, the last A mode track is recorded together with the end mark (t9). After recording the last A-track, the capstan motor 11 is accelerated to the normal speed all at once (t1
0). While the tape speed is increasing, the drum records dummy data together with dummy marks at a rate of 1 track per 1/2 rotation (t11). This is used for tracking servo during playback.

Since no data can be recorded in this section for about 0.2 seconds, audio data is stored in the buffer memory 13 (t12). Before the buffer memory 13 becomes full, recording of the full audio track is started (t13). At this time, since the recording is performed at a density of about 11 times, the data stored in the buffer memory 13 sharply decreases (t14). Immediately before the data in the buffer memory 13 becomes empty, the mode is switched to the AV mode track (t1
Five). Video data 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. 7D and 7E show time charts of the data amount of the tracking and audio buffer memory 12 during reproduction. Further, FIGS. 7F and 7G show the data amount of the video buffer memory 14 at the time of reproduction and the time chart of the video mute. For about 0.2 seconds after the AV mode is reproduced, the video and audio buffer memories 14 and 12 are set to the full state, so that the output of the signal is slightly delayed (t16). After reading the last track in the AV mode, the tape speed is reduced to about 1/5 and the A mode track is waited for (t17). At this time, since no signal is obtained until the A-mode data is reproduced, the amount of data in the buffer memories 12 and 13 decreases.

When approaching the A mode track, one tape is reproduced many times because the tape speed is low. Therefore, accurate data can be read without controlling tracking. Here, the steady value of A mode is about 2
Since the data is recorded with double the density, the data amount of the buffer memory 12 increases (t18). When the track recorded at about twice the steady value is completed, the tape speed is set to the steady value in the A mode (t19). At this time, the buffer memory 12 is almost
Holds 0.2 seconds worth of data. During reproduction, the capstan servo 9 controls so that the data amount in the buffer memory 12 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. After reading the last track in A mode,
Since there is no data for 0.2 seconds, the amount of data in the buffer memory 12 decreases (t20). Eventually, the track t11 containing the dummy data appears, so the tracking is locked (t21). Next, when the full audio track t13 is detected, this data is stored in the buffer memory 12.
Since the data density is 11 times higher, the buffer memory 12 rapidly increases (t22).

Next, an AV track appears, but it is not immediately output because the buffer memory 13 for video is made equal to the audio data amount (t23). When the data amounts of the video and audio buffer memories 13 and 12 become equal, the video data is read out from the buffer memory 13 and the video mute is released as soon as the video signal processing is completed (t24). Thus (t16) to (t24)
In between, the voice is continuously played without interruption for a moment.

According to the above configuration, when the AV mode recording is turned on / off during the A mode recording, the sound can be reproduced without any momentary interruption. If you record only A mode on a tape that can record for 1 hour in AV mode, you can record for 10 to 20 hours. It is also possible to record in a mixed AV mode and A mode. The recording time at this time is AV mode and A mode.
Determined by the time ratio of the mode, it is 1 hour or more.

(2) Camcorder most suitable for recording at lectures, etc. Since this camcorder has few movements of the subject like at academic lectures, it is sufficient to record images in places, but want to record all audio parts. Also, it is not easy to use in a long lecture, etc., because many tapes have to be recorded. Furthermore, we will describe a camcorder that considers that it takes time to find the part that the user needs during playback.

(2-1) Recording Mechanism In the AV mode, a digitized video signal, a digitized audio signal, and a subcode are recorded in one track by time division multiplexing. In the A mode, a digitalized audio signal and subcode are recorded in one track by time division multiplexing. The digital audio signal requires only 1/10 to 1/20 the data amount of the video signal. For this reason, the tape speed can be considerably slowed down, and the recording time becomes long in flight. A mark indicating the A mode is recorded on the A mode track. At the time of reproduction, the A mode and AV mode tracks are distinguished by the presence or absence of a mark. In addition, the audio can be continuously reproduced when transitioning between the A mode and the AV mode.

(2-2) Recording example of image and sound or only sound As shown in FIG. 8A, first, the recording button "A" in the A mode is pressed to turn it on. At this time, only audio recording starts. Next, the recording button "V" in the AV mode is pressed to turn it on. Then, the image and sound are recorded. The AV mode is turned off by pressing the record button "V". The AV mode is turned off, but the A mode is still on, so only audio is continuously recorded. When the recording button "V" is pressed as necessary and the AV mode is repeatedly turned on / off, the video is intermittently recorded, but the audio is continuously recorded. Record button "A"
When both "V" and "V" are turned off, the recording is stopped.

(2-3) Mechanism of Playback of Image and Sound or Sound Only Playback buttons include "continuous playback button" for continuously playing back A mode and AV mode and "skip playback button" for playing back only AV mode. There is. FIG. 8C shows the state of tape reproduction by the "continuous reproduction button", and FIG. 8B shows the state of tape reproduction by the "skip reproduction button".

First, as shown in FIG. 8C, when the continuous reproduction button "C" is pressed, a normal image can be viewed in the AV mode area. In the A mode area, the screen 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 sound is reproduced. When the area becomes the AV mode again, normal image reproduction is performed.

In FIG. 8B, when the skip reproduction button "S" is pressed, the AV mode area is reproduced as it is. The area of A mode is grayed out, fast-forwards to the beginning of the next AV mode, and then resumes normal playback. When it becomes the A mode area again, the A mode area becomes a gray screen,
Fast forward to the beginning of the next AV mode, and then normal reproduction is performed, and this is repeated. Therefore, as shown in FIG. 8B, only the AV mode area can be seen in a short time.

(2-4) Skip Button During Playback FIG. 9 shows an example of operation buttons. Among the operation buttons, there are the following six skip buttons during playback. Skip button 1 to the beginning of the next AV mode, skip button 2 to the beginning of the next A mode, skip button 3 to the next mode change point (including stop and pause). Further, the above-mentioned skip buttons 1, 2, and 3 are provided with the reverse-side skip button 4,
There are 5 and 6.

When the skip buttons 1 to 6 are pressed twice or more, each mode change point is skipped by the number of times of pressing.
It is also possible to limit the maximum amount of one skip of these skips to about 5 minutes. In this case, when the next mode change point is more than 5 minutes apart, the reproduction mode is set at the point of 5 minutes.

(2-5) Display of various time information at the time of recording The recording time from when the tape is inserted 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“ 1 ”H“ 0 ”
"0" M "," AV mode "0" H "3""0" M "are displayed. To show the tape consumption, the total time converted to AV mode is the recording time of A mode and A
It is calculated and displayed from the recording time in V mode. If the tape speed in A mode is 0.1 times that in AV mode,
It can be calculated by (when recording in A mode) × 0.1 + (recording time in AV mode). Therefore, "" 0 "H" 3 "
“6” M ”is displayed.

Further, the time when the remaining amount of the tape is recorded in the AV mode and the time when the entire tape is recorded in the A mode are respectively obtained and displayed. In the case of recording all in the AV mode, it is obtained by (1H)-(total recording time converted into the AV mode) and displayed as "" 0 "H" 2 "" 4 "M". In addition, the time required to record all in A mode is calculated as (the time required to record all the remaining tapes in AV mode) × 10, which is ““ 4 ”H“ 0 ”“ 0 ”M”.
Is displayed. By the way, the length of the tape in AV mode was set to 1H.

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“ 0 ”H“ 4 "0" M "AV mode" 0 "H
“2” “0” M ”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,

[Equation 1]

[Equation 2] From

(Equation 3)

[Equation 4] Can be obtained by 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 may be used. .

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

[0040]

As described above, according to the present invention, 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, A control unit that generates a control signal for switching between the first recording mode and the second recording mode, and the recording mode is appropriately switched according to the control signal, and the first recording mode and the second recording mode are set on the recording medium. By providing a recording means for continuously recording a series of information while temporally mixing them, it is possible to realize a video tape recorder capable of recording a recording medium containing only audio for a long time.

[Brief description of drawings]

FIG. 1 is a connection diagram showing a configuration of a camera-integrated video tape recorder.

FIG. 2 is a connection diagram for explaining the drum servo shown in FIG.

FIG. 3 is a schematic diagram showing a tape pattern in AV mode.

FIG. 4 is a connection diagram showing a capstan servo during recording and reproduction in A mode and recording in AV mode.

FIG. 5 is a connection diagram showing a capstan servo during reproduction in AV mode.

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

FIG. 7 is a time chart for explaining recording / reproducing in A mode and recording / reproducing in AV mode according to the embodiment.

FIG. 8 is a schematic diagram showing regions in A mode and AV mode.

FIG. 9 is a schematic diagram for explaining an operation button.

[Explanation of symbols]

1 ... camera integrated videotape recorder, 2 ... video camera, 3 ... microphone, 4 ... tape, 5 ... recording section, 7 ... playback section, 8 ... drum servo, 9 ... capstan Servo, 10 ... System controller, 12,
13, 14 ... A buffer memory.

Claims (6)

[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 between the recording modes and the recording mode is appropriately switched according to the control signal, and the first recording mode and the second recording mode are temporally mixed on the recording medium. A video tape recorder, comprising: a recording means for continuously recording a series of information while being recorded. 2. The recording means, when the first recording mode is selected by the control signal, adds the identification data of the first recording mode to the video signal and the audio signal, and records them. 2. The video tape recorder according to claim 1, wherein when the second recording mode is selected, the audio signal is recorded with the identification data of the second recording mode added. 3. An operating section provided with a switch for selecting the first recording mode and a switch for selecting the second recording mode, wherein the recording means includes the first switch by the switch. The video tape recorder according to claim 2, wherein when the second recording mode and the second recording mode are selected at the same time, the recording is performed according to the second recording mode. 4. The recording means stops the recording operation when neither the first recording mode nor the second recording mode is selected by the switch. The video tape recorder according to item 3. 5. A display means for displaying the time information that can be recorded on the remaining portion of the recording medium in two types, one for recording only in the first mode and one for recording only in the second mode. The video tape recorder according to claim 1, wherein the video tape recorder is a video tape recorder. 6. A continuous reproduction mode for continuously reproducing the series of information and a skip reproduction mode for selectively reproducing only first recording mode portions discretely existing on the recording medium are selected. The video tape recorder according to claim 1, further comprising: a selection unit and a reproduction unit that reproduces the recording medium based on an instruction from the selection unit.