JPS60154307A - Video tape and video tape recorder - Google Patents

Abstract

PURPOSE:To obtain a new method recording multiplexedly a video signal and a sound signal by recording deeply the sound signal subjected to FM modulation onto a video track, recording a control signal onto a control track and a monitor sound signal onto an audio track and recording the video signal on the video track. CONSTITUTION:The sound signal subjected to FM modulation is recorded on the two tracks TA, TB of a video recording region 2 of a video tape deeply so that the azimuth angle of two heads is made different from the azimuth angle of the video heads. The control signal 4 is recorded on the control track 3 and the monitor sound signal is recorded on the audio track 5. The video signal is recorded on the video track 2 while the turning of the video heads is controlled by monitoring the control signal 4. It is possible in this way to record multi- plexedly the video signal and the sound signal such as background music on the video track while confirming the monitor sound.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a new videotape on which background audio is prerecorded, and a new videotape recorder for recording images on the videotape.

BACKGROUND TECHNOLOGY AND PROBLEMS As home-use video tape recorders with video cameras have become smaller, products that integrate the video camera body and the video tape recorder body have appeared. is becoming popular. A home video tape recorder with a video camera is used to record events such as weddings, receptions, sports days, or the growth process of a beloved child, but when playing back and watching the recordings, it is difficult to listen to them without beautiful music playing in the background. I feel lonely. Therefore, background music is often recorded by after-recording after recording.

Incidentally, the audio recorded by after-recording is recorded on an audio track parallel to the running direction of the videotape, and the running speed of the videotape is slower than that of a compact audio cassette.

Therefore, there was a problem that the sound quality was very poor.

OBJECTS OF THE INVENTION Therefore, the present invention seeks to provide a new videotape on which high-quality audio is recorded in advance in the background of images, and a new videotape recorder for recording images on the videotape. be.

The videotape of the present invention which achieves the object described in "Configuration of the Invention" has only FM-modulated audio No. 48 on the video track where the video signal is to be recorded by the rotating head, and a control signal on the rack. The audio track magnetically records a monitoring audio signal that is the same as the audio signal and the reproduced audio, and the FM modulated audio signal is magnetized to a layer deeper than the depth at which the video signal is recorded. It is characterized by being recorded.

Further, in the video tape recorder of the present invention, an FM-modulated audio signal is deep recorded in the video track where the video signal is to be recorded by the rotary head, a control signal is already recorded in the control track, and the above-mentioned signal is recorded in the audio track. For a videotape on which a monitor audio signal with the same playback sound as audio signal No. 1 has already been recorded, the rotation of the video head is controlled by monitoring the control signal, and the image is transferred to the video track of the video head. The present invention is characterized in that the monitor audio signal is reproduced at the same time as the signal is recorded.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, a video tape and a video tape recorder according to the present invention will be described in detail according to embodiments shown in the accompanying drawings.

1 and 2 show an embodiment of the videotape of the present invention. In the drawings, 2 is a video recording area occupying the middle area in the width direction of the videotape, and 3 is the lower part in FIG. A control track 3 has one row along the side edge, and a control signal 4 is recorded on the track 3. , 5 is an audio track located at the upper side edge of the videotape 1 in FIG.

Before video is recorded on the video tape 1, a frequency-modulated background music audio signal is magnetically recorded in the video recording area 2. TA and TB are helical tracks in which audio signals are recorded deep.
The track is arranged to coincide with a video track on which a video signal will be magnetically recorded later, and the control signal 4 serves as position information of the tracks TA and TB.

The audio recording is performed by a helical scanning method using two rotating heads in the same way as video recording by a home video tape recorder. However, it differs from ordinary video recording in the following points.

First, the audio signals recorded on the tracks TA and TB are FM-modulated signals similar to the luminance signals of the video signals, but the carrier frequencies are, for example, 1°38 MHz, 1.
The frequency is 58 MHz, which is lower than the carrier frequency of the luminance signal and higher than the carrier frequency of the chroma signal to be low-band converted.

Second, the azimuth angles of the two heads for recording audio signals are different from the azimuth angle of the video head used for recording video signals. That is, the azimuth angle of the video head is set at an appropriate angle, for example, ±7°, to prevent crosstalk of the luminance signal of the video signal, but the azimuth angle of the head for recording audio on the videotape of this embodiment is The angle is set at an appropriate angle of, for example, ±45° to prevent crosstalk of an audio signal having a lower frequency than a luminance signal.

Thirdly, the head gap is made wider than the video head gap in response to the difference in signal frequency, and therefore, the magnetic layer has a deep layer where the video signal is magnetized to a layer deeper than the layer where the video signal is recorded. Audio is recorded by recording. FIG. 2 shows a cross section of one trunk, for example, taken along the TA. In the figure, 6 is the base of the video tape 1, 7 is the magnetic layer, 8 is the audio head for magnetically recording audio signals, and 9 is the base of the video tape 1. A magnetized part magnetized by the audio head 8, a video recording magnetized part 10 which is later magnetized by recording a video signal by the video head, and a surface layer 11 which is magnetized by recording a video signal. As is clear, the bottom part of the magnetic layer 7 is magnetized by the audio radar 8, and the magnetized layer is deeper than the surface layer where images are recorded. That is, the audio signal is magnetically recorded by deep recording.

Furthermore, the audio track 5 of the video tape 1 has recorded the same audio as the audio recorded on the helical tracks TA and TB of the video recording area 2. Recording of audio on this audio track 5 is performed using the alternating current bias method as in a normal audio tape recorder. The sound quality recorded on this audio track 5 cannot be said to be high because the running speed of the video tape 1 is slow compared to the tape running speed of the audio video tape recorder. This audio track 5 also has helical tracks TA and T.
The reason why the same sound as that recorded in B is recorded is so that the recorded sound can be monitored before shooting.

FIG. 3 is a circuit diagram showing the configuration of a video tape recorder equipped with a video camera for recording only images on the video chip shown in FIGS. 1 and 2.

12 is a vidicon, 13 is a preamplifier that amplifies the output signal of the bidicon 12, and 14 is a Y/C separation circuit that processes the signal output from the preamplifier 13 and separates the luminance signal Y and chroma signal C and outputs them. It is something. 15 is an AGC circuit that receives the luminance signal Y output from the Y/C separation circuit 14; 16 is a γ correction circuit that receives the luminance signal Y output from the AGC circuit and performs γ correction; 17 is the γ-corrected luminance signal Y 18 is an ACC receiving the chroma signal C output from the Y/C separation circuit 14;
circuit; 19 is a low-frequency conversion circuit that converts the chroma signal C output from the ACC circuit 18; 20 is an FM modulator 17;
a superimposition circuit that superimposes the FM-modulated luminance signal Y from the FM-modulated luminance signal Y and the low-frequency-converted chroma signal C from the low-frequency conversion circuit 19; 21 is a recording amplifier that amplifies the video signal output from the superimposition circuit 20; 22A and 22B are video heads which receive the video signal from the recording amplifier 21 and record the video tape l.
magnetically record the video signal. This video head 22A,
22B is for recording a video signal having a higher frequency than the audio signal as described above, so the gap is narrower than the gear amplifier of the head used for recording the audio signal. FIG. 4 is a cross-sectional view of the video tape l showing the state in which video signals are recorded by the video head 22A or 22B. By this magnetic recording, video signals are multiplex recorded on the surface layer 11 of the magnetic layer 7, on which audio signals have already been recorded deep.

23 is a motor that rotates a rotary drum that holds the video heads 22A and 22B, 24 is a pulse generator attached to the motor 23, and 25 is a phase comparison between a signal from the pulse generator 24 and a reference signal from a switching circuit SWI, which will be described later. The phase comparator 26 is a drive amplifier that integrates and amplifies the phase comparison signal from the phase comparator 25 to rotate the motor 23 in synchronization with the reference signal.

The switching circuit SWI switches the signal sent to the phase comparator 25 between the control signal from the control head 27 and the vertical interval signal from the reference signal generator 28. The signal is used as a reference signal in the phase comparator 25 as described above. This switching circuit S
The normally closed switching terminal of Wl is the reference signal generator 28
The normally open switching terminal is connected to the output terminal of an amplifier 29 that amplifies the control signal. The output terminal of the reference signal generator 28 is connected to the input terminal of the amplifier 30. SW2 is a switching circuit provided between the amplifiers 29 and 30 and the control head 27. Its common terminal is connected to the control head 27, its normally closed terminal is connected to the output terminal of the amplifier 30, and its normally open terminal is connected to the output terminal of the amplifier 30. It is connected to the input terminal of amplifier 29. SW3 is a switching circuit that switches the signal input to the deflection circuit 31, its common terminal is connected to the control signal input terminal of the deflection circuit 31, its normally closed terminal is connected to the other output terminal of the reference signal generator 28, and , the normally open terminals are connected to the output terminal of the amplifier 30.

The deflection circuit 31 scans the electron beam '(7) of the vidicon 12.

32 is an audio head which magnetically records an audio signal on the audio track of the video tape 1 and reproduces the audio signal magnetically recorded on the audio track;
It is connected to the common terminal of switching circuit SW4. - The normally closed terminal of the switching circuit SW4 is connected to the output terminal of the amplifier 33, and the normally open terminal is connected to the input terminal of the amplifier 34.
36 is a preamplifier for amplifying the audio signal output from the microphone 35, and 37 is a preamplifier. A recording circuit processes the output signal of the re-amplifier 36, and the output signal of the recording circuit 37 is inputted to the amplifier 33. 38 is a reproducing circuit which processes the output signal of the amplifier 34; 7,4□';'t f
r-4'J7,. g, hey)” 7k 739~
The audio is played back by the headphones 39.

40 is an erasing head, which is connected to the common terminal of the switching circuit 5W55. The normally closed terminal of the switching circuit SW5 is connected to the amplifier 4.

The normally open terminal is connected to the output terminal of No. 1, and the normally open terminal is grounded. Reference numeral 42 denotes an erasing oscillator, and the erasing oscillator signal input thereto is input to the amplifier 41.

In each of the above-mentioned switching circuits SWI to SW5, when performing normal recording, that is, when recording on a virgin video tape or erasing what has already been recorded, the common terminal is connected to the normally closed terminal. When recording video signals on the video tape 1 shown in FIGS. 1 and 2, the common terminal is controlled to be connected to the normally open terminal.

Note that 43 indicates the running direction of the videotape.

Next, the operation of the video tape recorder shown in FIG. 3 will be explained.

(1) When performing normal recording When performing normal recording, each switching circuit 5
Wl-3W5 maintains a state in which the common terminal is connected to the normally closed switching terminal. Then, a reference signal is sent from the reference signal generator 28 to the phase comparator 25 via the switching circuit SW1, and the motor 23 that rotates the heads 22A and 23B is controlled by the reference signal output from the reference signal generator 28. , rotates in synchronization with that signal.

Further, the erasing oscillation signal outputted from the erasing oscillator 42 is amplified by the amplifier 41, and the switching circuit SW
5 to the erase head 40. Therefore, the signals recorded on the video tape are completely erased by the erasing head 40.

Furthermore, the other output signal of the reference signal generator 28 is input to the deflection circuit 31 through the switching circuit SW3, and horizontal and vertical scanning of the electron beam is performed based on the reference signal.

The output signal of the vidicon 12 is amplified by the preamplifier l3 and input to the Y/C separation circuit 14. Applicable Y
The chroma signal C output from the /C branch circuit is ACC.
After the level is adjusted in the circuit 18, the low frequency conversion circuit 19 converts the signal into a low frequency conversion signal having a carrier frequency of approximately 688 KHz. The low frequency converted signal is input to the superimposition circuit 20.

The 11 degree signal Y output from the Y/C separation circuit 14 is A
The GC circuit 15 performs gain control, the γ correction circuit 16 performs γ correction, and the FM modulator 17 performs FM modulation. The FM-modulated luminance signal Y is input to the superimposition circuit 20, where the luminance signal Y is
and chroma signal C are superimposed on each other. Heavy clothing/circuit 20
The video signal output from the recording amplifier 21 is amplified and applied to two nodes 22A and 22B. Therefore, video signals are recorded on the video tape by the heads 22A and 22B.

In addition, the reference (outputted from the No. 8 generator 28), (semi-I 1
No. 1 is amplified by the amplifier 30 and applied to the control head 27 via the switching circuit SW2, and the reference signal is magnetically recorded on the control track of the video tape as a control signal.

Then, the audio head 32 receives the audio signal picked up by the microphone 35 via the switching circuit SW4, and records it on the audio track.

Ordinary recording is performed as described above.

(2) When recording video on videotape l on which audio has already been recorded When recording video on videotape 1 on which audio has already been recorded, the common terminal of each switching circuit SWI to SW5 is set to a normal open terminal. It becomes electrically connected. Therefore, the erasing head 40 is connected to the switching circuit S
It is grounded via W5 and does not perform the erasing function. Therefore, the audio signal deeply recorded on the i□ video track and the control signal recorded on the audio track will not be erased.

Further, the control head 27 has a switching circuit SW2.
It is connected to the input terminal of the amplifier 29 via. Therefore,
The control signal detected by the control head 27 is amplified by the amplifier 29 and input to the deflection circuit 31 via the switching circuit SW3, and is also input to the phase comparator 25 via the switching circuit SWI. As a result, the motor 23 that rotates the video heads 22A and 2B is controlled by the control signal that has already been recorded, and the video heads 22A and 22B are in a state of scanning over the video track (on which the audio signal is deeply recorded). Realize.

Further, the deflection circuit 31 records video signals by the video heads 22A and 22B based on the control signal received from the control head 27 in the same manner as described above. Since this magnetic recording of the video signal is performed on the surface layer 11 of the magnetic layer 7 as shown in FIG. 4, the deep recorded audio signal is not destroyed.

The audio head 32 has a switching circuit SW.
The monitor audio signal recorded on the audio track is detected by the audio head 32 and reproduced by the headphone 39. Therefore, the cameraman can take pictures while monitoring the audio that should be played in the background of the video.

In this embodiment, the video tape recorder records jj
Therefore, when playing back, a separate video tape recorder is used.

In that case, the video tape recorder is equipped with an audio reproduction circuit system that uses a bandpass filter to separate the audio signal from the reproduction signal reproduced by the rotating video head, demodulates it using an FM demodulator, and reproduces the audio. It must be a so-called high-fidelity video tape recorder.

As mentioned above, as shown in FIGS. 1 and 2, the videotape of the present invention on which high-quality audio has been prerecorded has a third video tape.
By recording captured images using the video tape recorder of the present invention as shown in the figure, it is possible to multiplex record a video signal and an audio signal such as high-quality pack ground music on a video track. It is possible to reenact scenes from weddings, sports days, etc. while playing them.Furthermore, since the videotape has an audio signal recorded on the audio track for monitoring purposes, it is possible to record while checking the background audio. This also makes it possible to make full use of camera work that matches the background music.Of course, the audio monitor also prevents the possibility of accidentally recording footage onto a videotape that is deeply recorded with music that is not appropriate for the shooting content. It can be prevented.

[Brief explanation of the drawing]

1 and 2 show an example of the implementation of the videotape of the present invention, FIG. 1 is a plan view, FIG. 2 is a sectional view, and FIG. 3 is an example of the implementation of the videotape recorder of the invention. The circuit diagram and FIG. 4 are cross-sectional views of the videotape of the present invention after video recording. Explanation of codes 1..Video tape, 3..Control track,
4...Control signal, 5...Audio rack, 22A, 22B@φ・Rotating head

Claims (2)

[Claims] (1) The video track on which the video signal is to be recorded by the rotating head receives only the FM-modulated audio signal, the control track receives the control signal, and the audio track receives monitor audio that is the same as the audio signal and the playback audio. A video tape characterized in that the signal is magnetically recorded, and the FM-modulated audio No. 48 is recorded by deep recording that magnetizes a layer deeper than the depth at which the video signal is recorded. (2) FM-modulated audio signals are deep recorded in the video track where the video signal is to be recorded by the rotating head, the control signal is already recorded in the control track, and the audio signal and the playback sound are recorded in the audio track. is to monitor the control signal on a videotape on which the same monitor audio signal has already been recorded.Thus, while controlling the rotation of the video head, the video signal is recorded on the video track by the video head at the same time. A video tape recorder characterized in that it reproduces a monitor audio signal.