JPH02130779A - Reproducing device - Google Patents

Abstract

PURPOSE:To confirm the correspondence of video with sound at a glance, to facilitate the editing operation of the video and the sound and to accomplish attentive editing by storing sound waveform information corresponding to the video in a waveform memory and displaying it at the time of being still or at the time of reproducing in slow motion. CONSTITUTION:At the time of making a tape in a reproduced state, the sound waveform information is successively stored from the memory area of address one to the memory area of address (n) of the waveform memory 4. When the memory area of the address (n) is filled up, the sound waveform information of the address two is shifted to the address one from the frame of next video and the information of the address (n) is shifted to the address (n-1), then new information is stored in the address (n). Thereafter, at the time of stopping reproducing and setting a jog mode, the tape is stopped to obtain the state of a still picture and the jog dial 12 of an operation panel is rotated to feed the tape in a normal direction, so that the waveform information is shifted by one address every time the video is moved by one frame as well as at the time of reproducing. When the tape is fed in a reverse direction, substraction is performed in an address counter, and the information is displayed on a monitor in any case.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a playback device, and more particularly to a playback device that can confirm at a glance video and audio waveform information corresponding to the video.

[Prior Art] Magnetic recording and reproducing devices (hereinafter referred to as VTRs) have been widely known as playback devices that play back video and audio from a medium on which video and audio signals are recorded.

. In addition to normal playback functions, this type of VTR device is generally equipped with special playback functions such as still image playback, slow-motion playback, fast-forward playback, and one-rewind playback, making it convenient for finding the beginning of a tape, etc. There is. In particular, high-end machines for professional use require easy and high-precision editing, so a dial (jog dial) that can move the tape continuously in forward and reverse directions is required. ) is provided so that the beginning of the tape can be found in units of one frame.

[Problem to be solved by the invention] However, when setting an editing point by operating the jog dial five times, the sound changes in pitch, timbre, etc., so the sound becomes very slow. It becomes difficult to remove. Therefore, editing points are determined using various methods, such as storing a certain amount of time of audio near the editing point using a storage device (memory) and repeatedly playing it back. Requires considerable skill. Moreover, even if the editing points are determined in this way, it is difficult to actually play back the IJA-collected tape.
Alternatively, there is a problem in that a large amount of memory is used to edit the audio of a continuous portion of the tape, and the connection of the audio at the editing point must be confirmed by ear. Furthermore, conventional VTR devices have the problem that it is difficult to understand the relationship between video and audio.

In this way, when attempting to perform high-precision tape editing with conventional VTR equipment, it is necessary to use extremely expensive and complicated equipment, and even for highly skilled personnel, it takes time and effort. It took.

SUMMARY OF THE INVENTION An object of the present invention is to provide a playback device that can solve the above problems and facilitate editing of audio and video.

[Means for Solving the Problems] In order to achieve such an object, the present invention provides a reproduction device that reproduces video signals and audio signals recorded on a recording medium, which converts the audio signals into audio waveform information. a converting means for storing the audio waveform information outputted from the converting means; and a storage means for storing the audio waveform information corresponding to a frame of the video in which the video signal is reproduced and displayed as a video. and a display means for selecting and displaying a selection from among the following.

[Function] According to the present invention, the correspondence between the video and the audio is improved by simultaneously displaying the audio waveform information corresponding to the video on the monitor screen on a part of the monitor screen or on another display device. can be checked at a glance.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 6, 1 is a reproduction electromagnetic converter such as a magnetic head that electromagnetically converts a signal recorded on a magnetic recording medium such as a magnetic tape into an electric signal. System 2 is a video signal processing section that processes the video signal of the signal converted by the reproduction electromagnetic conversion system 1 into a signal in a format suitable for the display means. Reference numeral 3 denotes an audio signal processing section which processes the audio signal among the signals output from the reproduction electromagnetic conversion system 1 into an audio signal in the form of an audio waveform suitable for audio output means such as a speaker. A waveform memory 4 stores the audio signal output from the audio signal processing section 3 as audio waveform information. 5 is a time code processing unit that specifies the position of information on the videotape. Reference numeral 6 denotes a tape transport system that accurately controls the running of the tape in order to perform accurate reproduction.

7 is a video output terminal that outputs a video signal output from the video signal processing section 2; 8 is a video monitor output terminal that outputs a signal that is output from a superimpose processing section 15, which will be described later; 9 is a terminal in the waveform memory 4; 10 is an audio output terminal that outputs the audio signal output from the audio signal processing section 3;
1 is a time code output terminal through which time code is input and output. Reference numeral 12 is a jog dial that can move the tape continuously in forward and reverse directions, and reference numeral 13 is an operation button that operates the magnetic recording/reproducing device.

When the operation button 13 or jog dial 12 is operated, the system control section 14 causes the tape transport system 6.
Video signal processing section 2. A command is sent to the audio signal processing section 3 and the time code processing section 5, and the operation is performed according to the command.

The superimpose processing section 15 superimposes audio waveform information corresponding to the frame of the video signal on the video signal output from the video signal IA processing section, and outputs the superimposed signal to the video monitor output terminal 8.
Output to. Therefore, the time code value 16 and the audio waveform information 17 are displayed on the monitor screen of the display means connected to the video monitor output terminal 8, as shown in FIG.
are displayed superimposed. In FIG. 2, two triangular black marks represent frame boundary positions and indicate that audio waveform information of CHI among a plurality of audio channels (hereinafter abbreviated as CH) is displayed. Of course, it is also possible to display CH2 instead of CHI, and Cl
11 and CI2 may be displayed on the monitor screen by changing the color 9 position etc. on the screen at the same time, or CHI and CH2
It is also possible to display the sum on the monitor screen.

Next, the operation of the waveform memory 4 and the audio waveform information will be explained with reference to FIGS. 3 and 4 based on the actual operating procedure.

As shown in Figure 3 (A), the waveform memory is divided into a total of n memory areas where one address is assigned to one frame of video. Audio waveform information for one frame is stored in the area.

Further, in FIG. 3, an arrow 20 indicates a memory area in which audio waveform information corresponding to the video that is being output from the video monitor output terminal 8 at that time is stored, and the value of that address is for the address. is stored in the up/down counter.

When the tape is put into a playback state, the played audio waveform information is sequentially stored starting from the memory area at address 1. When the memory area at address n is filled, from the next video frame, the audio waveform information at address 2 is transferred to the memory area at address 1, and
The voice waveform information at address n is moved to the memory area at address n-1, and the new voice waveform information is stored in the memory area at address n. The above operation does not require physically actually moving all the audio waveform information within the waveform memory 4. For example, the value of the difference between the physical address of the waveform memory 4 and the relative addresses 1 to n is The voice waveform information can be quickly rewritten by storing it in a counter and adding or subtracting 1 to the value of this counter.

This operation is repeated as long as the tape continues to be played. If you stop playback and enter jog mode, the tape will stop and a still image will appear. At this time, the third
As shown in the figure (^), the 1st to nth memory areas are filled with audio waveform information, and the address counter indicates address n. Also, Figure 4 (^) is displayed on the monitor screen.
Audio waveform information as shown in is displayed. Here, since there is no audio waveform information corresponding to the next frame yet, the area to the right of the right triangle mark is at 0 level.

In this state, if you turn the jog dial 12 to feed the tape in the forward direction, the audio waveform information at each address will be shifted by one address each time the video moves one frame, just as during playback described above. , the audio waveform information of the new frame is stored at addresses n. Here, the tape speed differs from that in normal playback, but in a system where the audio signal is played back with a rotating head, the tape speed is 1
Audio signals can be obtained field by field. Furthermore, when reproducing a linear track with a fixed head, it is necessary to reproduce it with an MR head and further correct the time glaze.

Next, when the jog dial 12 is rotated in the opposite direction to send the tape in the opposite direction, the value of the aforementioned address counter can be subtracted. When the m-th frame of audio waveform information corresponding to the stored n frames is displayed on the monitor, the image shown in FIG. 3(B) is displayed.
As shown in FIG. 4, the counter indicates address m, and the audio waveform information displayed on the screen becomes as shown in FIG. 4(B). Furthermore, the reverse feed continues until the counter value changes as shown in Figure 3 (C
), the audio waveform information displayed on the monitor becomes as shown in FIG. 4(C). Further, when sending backwards, the audio waveform information at address n-1 is sequentially sent to the memory area at address n, the audio waveform information from the memory area at address 1 is sent to the memory area at address 2, and so on. New audio waveform information is stored.

In this way, it is possible to always display audio waveform information corresponding to the video frame displayed on the monitor screen.

For example, in the actual work of combining video and audio to determine the editing point, the previous and subsequent frames are repeatedly rotated forward and backward using the jog dial 12 to check the video and audio. If the number n of memory areas of the waveform memory 4 is set to about 10, as shown in FIG. 4(B),
It is thought that the optimal editing point can be determined while the waveforms of the previous and subsequent frames are also visible.

The operation of the waveform memory as described above can be performed in the same way in slow motion playback, reverse playback, and low magnification forward/reverse search. In addition, the contents of the waveform memory 4 will be empty immediately after loading the tape, or immediately after high-speed search, fast forwarding, or @reverse, but the contents of the waveform memory 4 will be empty, but when the tape is stopped, several frames around the stopping point will be automatically played back. If configured in advance, audio waveform information can be displayed even in such a case.

Furthermore, since the waveform memory 4 stores audio waveform information in the form of audio waveforms, the audio waveform information for a certain period of time stored in the waveform memory 4 can be repeatedly output from the audio waveform information output terminal 9. For example, since it becomes an audio signal as it is, it is possible to confirm it by ear using a monitor speaker.

The display of audio waveform information on the monitor screen is shown in Figure 4.
We have shown the method of rewriting one frame at a time, but the fifth
As shown in Figures (^) to (C), the voice waveform information may be moved continuously in accordance with the operating speed of the jog dial. In this case, the two triangular black marks indicating the parts of the audio waveform information corresponding to the frame of the currently displayed image also move as the audio waveform information moves. When editing, it may be necessary to switch the audio midway within one frame, so the editing point of the audio can be indicated with the cursor 30, and the video is changed to the frame where the cursor 30 is located, that is, the movie displayed on the monitor screen. By outputting , you can make very detailed edit point settings.

Further, in the above explanation, no particular mention was made of the storage method of the audio signal, but the format of the audio signal may be an analog audio signal or a digital audio signal. just,
In the case of digital audio signals, ^/D (analog/
This is advantageous because many parts, such as digital) converters, are shared with the audio signal processing section 3.

The quantization method of the audio waveform information to be stored may be numerically linear quantization of 16 bits/sample, 48 samples per 7 seconds, but in the application of the present invention, it is determined by the ease of viewing the audio waveform information. It is also possible to use 8 bits/sample, 16 samples per 7 seconds, nonlinear quantization, logarithmic compression, etc. to save memory capacity and make audio waveform information easier to see.

Further, in this embodiment, the video and audio waveform information are superimposed on the monitor screen, but a dedicated display may be used, or an oscilloscope or the like connected to the audio waveform information output terminal 9 shown in FIG. It may be configured as shown in .

[Effects of the Invention] As explained above, according to the present invention, the audio waveform information corresponding to the video is stored in the waveform memory and displayed when the video is stationary or during slow-motion playback, so the interaction between the video and the audio is improved. Compatibility can now be checked at a glance, greatly improving the workability of video and audio editing, and
This has the effect of enabling more detailed editing.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing an example of a monitor screen display, FIG. 3 (^) or C) is an explanatory diagram showing the operation of the waveform memory, Figures 4 (A) to C) are audio waveform diagrams showing audio waveform information corresponding to Figure 3, and Figures 5 (^) to C) are audio waveform diagrams showing other audio waveform information. . 1... Reproducing electromagnetic conversion system, 2... Video signal processing section, 3... Audio signal processing section, 4... Waveform memory, 5... Time code processing section, 6... Tape transport system , 7...Video output terminal, 8...Output terminal for video monitor, 9...Audio waveform information output terminal, io...Audio output terminal, 11...Time code input/output terminal, 12... - Jog dial, 13... operation buttons. Fig. 2 Fig. 3 Mu H1 Mumu HI Mu Fig. 4

Claims (1)

[Scope of Claims] 1) A reproducing device for reproducing video signals and audio signals recorded on a recording medium, comprising: converting means for converting the audio signal into audio waveform information; and the audio waveform output from the converting means. It is characterized by comprising a storage means for storing information, and a display means for selecting and displaying the audio waveform information corresponding to a frame of the video in which the video signal is reproduced and displayed as a video from the storage means. playback device.