JP2801320B2 - Video signal recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording apparatus, and more particularly, to a video signal recording apparatus that records a video signal together with an audio signal read from a memory in which the audio signal is stored in advance. .

[Conventional technology]

2. Description of the Related Art A so-called camera-integrated video tape recorder (VTR) has been known as a video signal recording system of this type in the related art. Hereinafter, this camera-integrated VTR will be described as an example.

In a camera-integrated VTR, as a method of adding another sound such as BGM (background music) to a captured video image and sound, a so-called after-recording (after-
Recording) is well known.

On the other hand, in recent years, it has been proposed to perform recording called VOS (video on sound) using the deep recording method.

Since the above-mentioned post-recording is a well-known method, this VOS will be briefly described below.

The VOS is a method in which an image is shot in accordance with the music while listening to music recorded in advance in a deep layer of a magnetic recording medium, and a video signal is recorded on a surface layer of the medium.

First, as shown in FIG. 6, an audio signal a1 is recorded in advance on a deep layer of the recording medium, and an audio signal a2 having the same content is recorded on the linear track of the tape-shaped recording medium a3 in a corresponding manner. And when shooting, fixed head a4,
The audio recorded on the linear track a2 is reproduced by the reproducing circuit a8 and the amplifier a9, and the audio signal output from the output terminal 10 is listened to the image sensor a11 while confirming the content of the deeply recorded audio signal. Using a camera unit comprising a camera signal processing circuit a12, a screen is photographed in accordance with the sound output from the terminal a10, and a video signal from the camera unit is switched by a switch a13, and a recording amplifier a1
4. Amplify by a15. Then, the video signal is recorded while forming the video track a7 on the deep recording track a1 by the rotary heads a6-A and a6-B.

In this manner, by shooting while listening to the BGM or the like recorded in advance, the shooting of the screen suitable for the BGM or the like ends.

[Problems to be solved by the invention]

However, in the above-mentioned after-recording method, since the background music or the like is recorded after the end of shooting, recording is performed twice on the same tape, and the camera-integrated type is used.
Other audio playback devices besides the VTR must be operated synchronously, which is very troublesome.

Also, in the above-mentioned VOS system, recording is performed twice on the same tape in the same manner, and the shooting time is restricted by the time of the previously recorded audio signal. is not.

Under such a background, the present invention provides a method for recording an audio signal read from a memory without special operation when recording a video signal together with the audio signal read from a memory in which the audio signal is stored in advance. It is an object of the present invention to provide a video signal recording device capable of continuously recording even in a discontinuous portion of a signal.

[Means for solving the problem]

For this purpose, according to the present invention, a memory in which an audio signal is stored in advance, an address control circuit for controlling a read address of the memory, and an audio signal stored in the memory are different. An audio signal output unit for outputting another audio signal, and an audio signal read from the memory alone recorded on a recording medium together with a video signal, or an audio signal read from the memory and the audio signal output unit. A recording unit for recording another audio signal to be output together with a video signal on a recording medium, and a control unit for controlling a read address control operation of a memory in the address control circuit in accordance with start / stop of a recording operation in the recording unit A video signal recording device is provided, comprising:

[Action]

With the above configuration, the video signal can be recorded together with the audio signal read from the memory in which the audio signal is stored in advance without performing any special operation, and even in the discontinuous portion of the video signal. Audio signals read from the memory can be recorded continuously.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail.

FIG. 1 shows a camera-integrated VTR as an embodiment of the present invention.
FIG. 2 is a diagram showing a configuration of a recording system of the first embodiment. The VTR is a camera unit including a lens 1, an image sensor 2, and a camera signal processing circuit 3 for photographing, and a video for recording a video signal output from the camera unit. An audio signal section comprising a signal processing circuit 5, a microphone 8 for recording audio, a microphone amplifier 9, and an audio signal processing circuit 14; an adder 6 for recording the audio signal and the video signal; a recording amplifier 7. The video signal and the audio signal are recorded on the tape-shaped recording medium 17 by a magnetic recording section comprising the head switch 15 and the rotating heads 16-A and 16-B on the drum 22 which are switched and selected by the head switch 15.

This VTR has the following servo mechanisms required for recording. First, the capstan servo system is a pinch roller 1
9, a capstan 18 for pressing the tape 17 together with this, an FG sensor 25 for detecting the rotation of the capstan 18, the sensor
A rotation servo circuit 34 for controlling the number of rotations of the capstan motor CM in accordance with the FG signal output by the control circuit 25, and a capstan motor CM driven by a control signal from the servo circuit.

A drum servo system for controlling the rotation of the rotating drum 22 in synchronization with the vertical synchronization signal of the video signal includes a PG generator 23 for detecting the rotation phase of the rotating drum 22 and a PG generator 23 for detecting the rotation speed.
It comprises an FG generator 24, a servo circuit 34 for controlling the rotation speed and phase of the drum 22 based on the output signals of the generators 23 and 24, and a drum motor DM driven by the control signal.

The rotary servo circuit 34 generates a head switching pulse (HSP) having a fixed phase relationship with the drum PG output from the PG generator 23, and the HSP causes the head switching switch 15 to switch at a cycle of video vertical synchronization. Can be

With the configuration of the servo system as described above, the relative position between the heads 16-A and 16-B and the tape 17 during normal recording of video signals and audio signals is determined.

Next, an operation of recording audio such as specific BGM together with a captured image will be described.

For example, audio signals such as BGM are digitally-sampled at a sampling period of 15 kHz to 48 kHz and a quantization density of about 8 to 16 bits.
The data is converted into data and written and stored in advance in a digital memory 39 as a storage element. The memory 39 is in the form of a card-shaped memory unit. By inserting and removing a desired card, information of audio to be recorded can be selected. The inside of the one-dot chain line 55 in FIG. 1 is a card-shaped memory unit.
It can be separated into the main body. For this purpose, it has an audio input / output port P1 of the memory 39 and connection ports P2 and P3 for exchanging signals between the memory control circuit 40 and the system controller 41. It has a configuration.

The audio data read from the memory 39 is stored in the D / A converter 4
At 5, the audio signal is restored to an analog audio signal, and the restored analog audio signal is connected to a volume 10 a of an audio mixer (balancer) 10. The balancer 10 comprises a volume 10a for setting the volume on the memory side, a volume 10b for setting the volume on the microphone side, and an adder 12 for mixing the signals of both volumes, and both volumes are connected so as to set the volume complementarily. I have. That is, when the volume is fully turned to one end, only one voice is output and the other voice is not output. In addition, at an intermediate position between both ends, it is set so that an audio signal mixed at a volume balance corresponding to the position is output.

By playing back music such as BGM stored in the memory prior to shooting from the memory during shooting by the above configuration and operation, the audio signal output from the adder 12 is output to the audio processing circuit described above. And recorded on the tape 17 together with the video signal.

Reference numerals 35 and 36 denote external input terminals. The external audio signal from the terminal 35 and the audio signal from the adder 12 are selected by the switching switch 13, and the external video signal from the terminal 36 and the camera The output of the signal processing circuit 3 is selected by the switching switch 4. The switching switches 4 and 13 are normally connected to the B side, and are connected to the A side when there is an external input.

Hereinafter, the memory control in the continuous shooting of the camera-integrated VTR of this embodiment will be described.

The memory 39 described above is controlled by a memory control circuit 40, and the memory control circuit 40 is controlled by a system control microcomputer 41 (hereinafter, system controller). The system controller 41 appropriately changes the control contents using the operation unit 42. The operation unit is configured to receive the following various operation keys. That is, the operation unit includes a memory key 47 for storing music before camera shooting, a BGM key 46 for setting whether or not to reproduce sound of the memory 39 such as BGM sound, and a camera-integrated VTR. Includes trigger key 48 for starting or stopping recording.

The splicing operation controls the above-mentioned servo loop so as to form a track pattern on the tape as shown in FIG. In FIG. 2, shooting scene A
When forming the video track by splicing taking photographic scene B and tracks A _n is the final track B ₁ is the scene of the scene A B
Is the first track.

Here video audio such as but switched by a change in scene BGM is preferably uninterrupted by tracks A _n and track B _1. The VTR of the present embodiment realizes the memory control by the system controller 41 that enables the continuous recording of the sound such as BGM at the time of such scene switching.

FIG. 3 is a conceptual diagram showing the concept of the memory control of this embodiment.

The upper part shows the recording state at the time of camera shooting by the ON / OFF of the trigger key 48, and the horizontal axis indicates time during which recording is being performed during the period indicated by oblique lines.

Correspondingly, the memory control circuit 40 operates to read out audio data from the audio memory 39 only when the trigger key 48 is ON. This situation is shown in the middle stage with the address of the memory 39 being plotted on the horizontal axis.

The lower part shows the state of the playback screen corresponding to the sound from the memory at the time of playback, with the horizontal axis representing time.

The detailed timing for the address of the memory
Shown in the figure.

In FIG. 4, (a) is HSP (Head Switching Pulse), which is inverted every unit of track formation (one field period). FIG. 4 (b) shows an instruction pulse from the trigger key 48, and FIG. 4 (c) shows a recorder mode in which REC (recording) is performed in synchronism with the inversion of the HSP every time a trigger pulse (b) is input.
Recorder mode control signal for inverting REC pause (recording standby), (d) Servo mode control signal for switching the tape between running (RUN) and stop (STOP) corresponding to the recorder mode control signal (c), (e) ) Is a memory mode control signal instructed from the memory control circuit 40 to the memory 39,
The signal (e) is a RE _inv (read) which is the reverse of the RE (read enable: read permission) mode in which the audio signal can be read from the memory 39 only when a track is formed in accordance with the servo mode control signal (d). Prohibition) mode switching signal. FIG. 4 (f) shows an address signal instructed from the memory control circuit 40 to the memory by an address control signal of the audio memory 39. Note that the dotted line of the address indicated by the dotted line conceptually shows a state in which the tape is stopped at the time of recording (corresponding to the arrow) and the time is shortened at the time of reproduction and the state is continuously reproduced as in FIG. .

As is evident from FIG. 4, the recording of the video signal from the camera is performed only when the tape is running so that the mode of the memory 39 is set to RE and the memory address is counted up, so that the sound such as BGM is not interrupted during the continuous shooting. Becomes possible.

Next, the operation of the system controller 41 during the above-described splicing shooting will be described with reference to the flowchart of FIG.

First, when the operation of the system controller 41 according to the flowchart of FIG. 5 is started by turning on a power key (not shown) or the like, the memory control circuit 40 issues an instruction to reset the address of the memory 39 (step S1). Thereafter, when the trigger key 48 is turned on (step S2), a tape running start instruction is output to the servo circuit 34 (step S3). After the tape starts running, if the servo circuit 34 detects that the tape speed has locked to a predetermined speed (step S4).
The VTR mode is set to the recording mode (step S5), and data can be read from the memory 39 (step S5).
6). In this flowchart, it is assumed that the VTR is set to a state in which the BGM key 46 is turned on, that is, a mode for reading data from the memory 39.

In this state, as described above, the audio signal processing circuit 14
, The video signal from the video signal processing circuit 5, and the tracking control pilot signal from the pilot signal generation circuit 33 are added by the adder 6,
Recorded on the tape 17. The pilot signal generation circuit 33 cyclically switches and outputs four types of pilot signals every one field period according to, for example, the HSP. Further, in this state, the system control microcomputer supplies information indicating that sound is being recorded from the memory 39 to the character generation circuit 30, and the circuit 30 generates a video signal corresponding to the character which can visually recognize the information. And supplies it to the adder 32. As a result, while recording the sound from the memory 39, the character is displayed on the electronic view finder (EVF) 31 together with the image being photographed.

In this recording state, the address counter in the memory control circuit 40 is counted (step S7). Each time a PG edge is input (step S8), the address data currently being counted is written into the memory 44 (step S8).
9).

When a stop key or the like (not shown) is turned on in step S10 in the recording state, the VTR enters the stop mode, and the process ends. Further, when the trigger key 48 is turned on again and the mode is shifted to the recording pause mode (REC pause mode), the memory mode is set to the read inhibition mode. At the same time (step S11), the counting of the address counter is stopped (step S1).
2) Stop reading audio information from the memory 39.

Then, the servo circuit 34 rewinds the tape 17 by a predetermined amount, and stores the rewind amount at this time as the number of tracks T (step S13). Here, the VTR is set to the recording pause mode (step S14), and waits for the trigger key 48 to be turned on again.

When the trigger key 48 is turned on, the VTR mode is first set to the playback mode, and the servo circuit 34 is set so that tape running is resumed.
Is controlled (step S16). Then, the number of tracks T described above corresponds to the number of tracks advanced according to the tape running.
From the current time, the current number of rewind tracks T
To correct. Then, T = 0 (step S18),
When the completion of the servo lock is confirmed (step S19),
The address data stored in the memory 44 is fetched (step S20), and this data is set in an address counter in the memory control circuit 40 (S21). Then, the memory 39 is set to the read mode again (step S22), and at the same time, the counting operation of the address counter is restarted (step S23), and the reading of the sound from the memory 39 is restarted. Simultaneously with this restart, the process returns to step S5, and the recording mode is again set in the VTR.

By repeating the procedure described above, if the continuous shooting operation is continued so that the total recording time becomes equal to or more than the time of the music stored in the memory, one continuous music piece was shot continuously. It can be added to video and recorded.

〔The invention's effect〕

As is apparent from the above description of the embodiment, according to the video signal recording apparatus of the present invention, a special operation is required when recording a video signal together with an audio signal read from a memory in which an audio signal is stored in advance. It is possible to provide a video signal recording device capable of continuously recording an audio signal read from a memory even in a discontinuous portion of a video signal without performing the operation.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a recording system of a camera-integrated VTR as one embodiment of the present invention, FIG. 2 is a diagram showing a track pattern by the VTR of FIG. 1, and FIG. 3 is a diagram of FIG. FIG. 4 is a diagram conceptually showing the continuous shooting operation of the VTR, FIG. 4 is a diagram showing the detailed timing related to the address of the VTR in FIG. 1, FIG. 5 is a flow chart for explaining the operation of the VTR in FIG. FIG. 6 is a diagram for explaining an example of the conventional additional recording of an audio signal. In the figure, 5 is a video signal processing circuit, 8 is a microphone, 10 is a balancer, 14 is an audio signal processing circuit, 16-A, 16-
B is a magnetic head, 17 is a magnetic tape, 18 is a capstan,
39 is an audio memory, 40 is a memory control circuit, 411 is a system control microcomputer, 42 is an operation unit, 44 is an address memory, and 55 is a memory unit.

Continued on the front page (72) Inventor Yoshihiro Nakatani 770 Shimonoge, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Tamagawa Office of Canon Inc. ) Inventor Kenshi Abe 770 Shimonoge, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Tamagawa Works of Canon Inc. (72) Inventor Yoshifumi Ishikawa 770 Shimonoge, Takatsu-ku, Kawasaki-shi Kanagawa Prefecture Inside the Tamagawa Works of Canon Inc. 1-137465 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04N 5/91-5/956 H04N 5/782

Claims (1)

(57) [Claims] 1. A memory in which an audio signal is stored in advance, an address control circuit for controlling a read address of the memory, and an audio signal for outputting another audio signal different from the audio signal stored in the memory An output unit, and an audio signal read from the memory is recorded alone on a recording medium together with a video signal, or an audio signal read from the memory and another audio signal output from the audio signal output unit are converted to a video signal. A recording unit that records on a recording medium together with a signal; and a control unit that controls a read address control operation of a memory in the address control circuit according to start / stop of a recording operation in the recording unit. Video signal recording device.