JPS60133570A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To record and reproduce fine voices in plural channels without complexing the constitution of video by switching a recording signal in accordance with the switching of a mode and recording sound signals on the plural channels by herical scanning method. CONSTITUTION:When the mode is switched by a recording mode setting switch 24, sound FM recording circuits 15-17 having different carrier frequency are activated in stead of a recording video signal processing circuit 2 and multi- channel sound signals are finely and multiplexly recorded in stead of the video signal at a practically high tape travelling speed by the herical scanning method through a recording amplifier 3, a rotary head 4, etc. These sound signals are reproduced also similarly, so that the sounds in the plural channels can be finely recorded and reproduced without complexing the mechanism of video of 8mm. system or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a magnetic recording amphibious device that uses a magnetic recording device, especially a drum.
The winding angle of the magnetic tape of ＼ was set to approximately 210 degrees, and the area corresponding to 180 degrees was recorded by frequency modulating the bidet No. 418 and sound lamp ＠, and the remaining approximately 30 degrees were recorded.
Pulse code changes for degree area! lI(PCM
), the so-called 81
The present invention relates to magnetic recording and reproducing devices such as 1111 video.

BACKGROUND OF THE INVENTION Conventional audio deflators have generally used a fixed head.

However, in the case of a fixed head, there is a contradictory relationship between the tape speed and the overall frequency characteristics when recording and playing back audio signals, and it is difficult to obtain high quality sound when recording for a long time. On the other hand, in order to obtain high-quality sound, the tape speed had to be increased, which resulted in a long recording time. Furthermore, even when attempting to increase the number of channels, the number of tracks is limited by the tape width of the magnetic tape, so there is a limit to increasing the number of channels when considering the S/N ratio and crosstalk.

By the way, recently, so-called 8m-video has become popular. In addition to its function as a video tape recorder, the 81 video has the feature of being capable of recording two channels of PCM audio, and of recording and reproducing high-quality sound signals. If it is possible to record not only video signals but also multiple channels of audio signals using such 81111 video,
Its uses can be further expanded.

Purpose of the Invention Therefore, the main purpose of this invention is to
By switching, it is possible to record not only video signals but also multiple channels of audio signals without making any major changes to the video configuration, making it possible to record high quality sound and record audio signals for long periods of time. It is to provide playback &ffi.

To summarize the invention, the magnetic tape is wound around the drum at a angle of 1/180 degrees, and the video signal and M#
It is possible to switch between modes such as an 8mm video recorder that records and plays back the i @ frequency modulated, and a mode that records and plays back the audio signal of the digitizer that has been frequency modulated (8 mm) on the video signal. The pattern was changed to 8-Ill mode.
If C, the 1 input to any of the number input terminals
Select one audio signal, frequency modulate it, and convert the output to a frequency modulated video signal! ! ! If the second mode is selected, the output signal of each channel input to the input facet of the jet number is transmitted and received by the frequency corresponding to each channel. Zhou vs. enemy is increasing,
The configuration is such that each output is further recorded on a 1:cL-(fB).

The above object 65 and other objects and features of the invention will become more apparent from the detailed description given below with reference to the drawings.

Description of examples FIG. 11 is a schematic block diagram of an embodiment of the present invention.

First, the configuration will be explained with reference to FIG. A video signal is input to a video input terminal 1, and this video signal is given to a recording video signal processing circuit 2. The recording video signal processing circuit 2 frequency-modulates the video signal 9 with a carrier wave of a predetermined frequency (hereinafter referred to as FM modulation). The frequency modulated video signal is a PCM signal and an audio FM signal, which will be described later.
It is given to the recording amplifier 3 together with the signal and the pilot signal. A recording amplifier 3 superimposes a frequency modulated video signal, an audio signal, a PCM bias, and a pilot signal, and records the superimposed signal onto a magnetic tape (not shown) from a video head 4. The signals recorded on the magnetic tape are read by a video head 4 and applied to a reproduction amplifier 5. The output of the reproduction amplifier 5 is given to a reproduction video signal processing circuit 6. The reproduced video signal processing circuit 6 duplicates the frequency modulated video signal into the original signal and outputs the same to the video signal output terminal 7.

1) An audio signal 8 is input to the GM signal input terminal 8, and this audio signal is sent to the PCt via the input/output switch 9.
vl signal processing time! 81O. The PCM signal processing circuit 10 converts the pano-J audio signal into PCM and supplies it to the above-mentioned recording amplifier 3.The PCM signal processing circuit 10 also supplies the signal +J: p c M reproduced by the reproduction amplifier 5 to the q processing circuit 1O for reproduction. Converts the PC~1 signal included in the output into a round audio signal and switches the input/output switching switch J9 to P Blue FM audio input terminal 12 to 14
The audio of each channel (3-kun is inputted to N is input. These audio signals are given to the Hatake 7 HFM recording circuits 15 to 17 corresponding to each channel via the input/output changeover switch 9. FM recording circuit 15 to 17
This modulates the corresponding audio signal with the w3'fX wave having a frequency that differs by -+1. And audio FM
Record each appearance of record times X815 to 17)
7, given to Nbu 3.

Furthermore, the output of the reproduction amplifier 5 is also given to audio FM reproduction circuits 21 to 23. These audio FM playback circuits 2
1 to 23 demodulate the FM audio signal of each channel included in the reproduced output, and output it to FM signal audio output terminals 18 to 20 via the input/output changeover switch 9. The recording mode setting switch 24 selects a first mode as a so-called 3nm mode, and frequency modulates the audio signal of each channel input to the FM audio signal input terminals 12 to 14 instead of the video signal in the 8mn+ mode and performs one-ζ recording. This is for switching between the two modes. Rinawachi,
When the recording mode setting switch 24 is set to the first mode, the recording video signal processing circuit 2゜audio FM recording circuit 1
5 and the audio FM reproducing circuit 21 are activated, and the other audio FM recording circuits 16 and 17 and the audio FM reproducing circuit 2 are activated.
2,234 disabled. Further, if the recording mode setting switch 24 is set to the second mode, the audio FM recording circuits 15 to 17 activate the audio FM playback circuits 21 to 23 and disable the recording video signal processing circuit 2. .

During reproduction, the mode detection circuit 25 detects whether the signal reproduced from the magnetic tape is in the first mode or the second mode.
・It is used to detect whether something exists. Zunawaji,
If the playback signal is in the so-called 8mm mode, the video signal contains a synchronization signal (by detecting this, it is possible to determine that it is in the first mode.If the playback signal contains a synchronization signal, If the number is not displayed, it is determined that the mode is the second mode.
and, depending on the second mode, PCM signal input terminal 8.1) CM signal output terminal 11. FM audio signal input terminal 12
or 14. FM audio and signal output terminals 18 to 20 are switched.

Figure 2 shows the spectrum of the signal in the @1 mode. In particular, Figure 2 (a) shows the wave number spectrum of the pylon chroma signal, audio FM signal, and luminance F tvl signal. , FIG. 2(b) shows the frequency spectrum of the pylon signal and the PCM signal. FIG. 3 is a diagram showing the spectrum of the signal in the second mode.

Next, the specific operation of one embodiment of the present invention will be described with reference to FIGS. 1 to 3. First, the video signal in the first mode, namely the so-called 8m1Il mode 1:
When recording audio signals and PCM signals, the recording mode setting switch 24 is set to the first mode. Then, the recording video signal processing circuit 2, the audio FM recording circuit 15, and the audio FM reproducing circuit 21 are activated. Then, the video signal inputted to the C1 video signal input terminal 1 is fed to the video signal processing circuit 2, where the chroma component and brightness component are FM modulated with carrier waves of different frequencies and fed to the recording amplifier 3. It will be done. Also, FM
The audio input to the audio input terminal 12 is recorded by the audio FM recording circuit 15 at a predetermined frequency σ carrier wave.
The signal is M-modulated and applied to the recording amplifier 3. Note that the recording amplifier 3 receives the frequency modulation signal 1'L supplied from the pilot-is light generation processing circuit 26,
A PCM signal provided by the GM signal processing circuit iQlfi is input. When the winding angle of the magnetic tape on the drum is 1/180 degrees, the digital amplifier 3 receives the pilot signal, the FM modulated chroma signal, and the FM signal as shown in the frequency spectrum of FIG. 2(a). By superimposing the modulated audio signal and the FM modulated luminance signal,
Recording is performed from the video head 4 onto a magnetic tape. The signal recorded on the magnetic tape is reproduced again by the video head 4, and transmitted through the reproduction amplifier 5 to the reproduction video No. 4R processing Iq! Circuit 6, audio FM playback circuit 21, and PCM signal processing circuit 10
and the pilot signal generation processing circuit 26. Playback video signal processing II! ! Circuit 6 is the F included in the reproduced signal.
The M-modulated chroma signal and luminance signal are converted to 111th tone and output to the video signal output terminal 7. At this time, the mode detection port 25 detects whether or not a synchronizing signal is included in the reproduced output, and if a synchronizing signal is included, the input/output changeover switch 9 is switched in accordance with the first mode. Through this series of operations, a conventional 8+n+i video operation is performed.

Next, when the second mode is set by the recording mode setting switch 24, the audio FM recording circuits 15 to 17 and the audio FM reproducing circuits 21 to 23 are activated. And the audio F IVI distribution @ distribution four route 15 and 17 is F
1.1 is input to the M audio signal input terminals '12 to 14.
:Audio FM recording circuits 15 to 17 that FM modulate the audio signals of each channel with different carrier waves of the same wave number.
The output is given to the recording amplifier 3 together with the pilot signal given from the pilot signal generation processing circuit 26.

The recording amplifier 3 superimposes the spectrum on the pylon 1 and the FM-modulated three-channel audio signals, as shown in the spectrum shown in FIG. The signal in this second mode is read by the video head 4 and sent to the audio FM playback circuit 21 via the playback amplifier 5.
It will be given from 23 to 23.

The audio FM playback ports 21 to 23 output the corresponding four audio signals to the FM audio signal output terminals 18 to 20 via the input/output changeover switch 9.

Regarding recording and playback of PCM Fa mouth,
Since it is similar to the conventional so-called B11-video and can be recorded and reproduced in both the first and second modes, its explanation will be omitted here.

As mentioned above, magnetic &! J on configuring the recording/playback device:
It can be used for 1 and 4 purposes. However, the area of the magnetic tape where PCM signals are recorded is F
What is the area of ``i-ki-te-no'' that records the M sound ri1 Buddhist name?
2, so G in the area of P CM M 9'r.
;1. r rν1 Ishikawa signal and number, dubbing J- by L
I can do things. For example, if you are giving a piano lesson, record the model sound of Ref. ) -CP 0M
Dubbing is done in area No. 14. Then play it and
4 pieces of ``M@voice m number and usage line diagram contents and P
For CM audio signals, input/output switching switch; 1'9 is J, FM 6 doors 1 signal f3 only, P is /vl@Heim only), k FM and P Clvl signals are played simultaneously. By switching to , you can compare the model sound and the name as ill content. It can also be used for piano duets by first recording it as an FM voice and then dubbing it with a PCM signal.

Effects of the Invention As described above, according to the present invention, there is a first mode in which video signals and audio signals are frequency-modulated and recorded and played back in an area corresponding to 180 degrees of the winding angle of the magnetic tape around the drum; A second mode in which frequency-modulated audio signals of multiple channels are recorded instead of the video signal is switchable, and when the first mode is selected, the frequency-modulated video signal and audio signals of multiple channels are recorded. One of the audio signals is superimposed with a frequency-modulated signal and recorded, and by selecting the second mode, the audio signal input to each input terminal of multiple channels is frequency-modulated and recorded. Since the first and second modes are arbitrarily selected, video signal recording and playback and 11 number chi 1? It becomes possible to record and play back the channel audio signal, and it can be used for various purposes.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an embodiment of the present invention. Figure 2 shows the signal spelling in 81 mode.
It is a diagram. FIG. 3 is a diagram showing the spectrum of the signal in the second mode. In the figure, 1 is a video signal input terminal, 2 is a recording video A
Signal processing circuit, 3 is a recording amplifier, 4 is a video camera,
5 is a reproduction amplifier, 6 is a reproduction video signal processing circuit, 7 is a video signal output terminal, 8 is a PCN, 1 (No. 6 input terminal,
9 is an input/output changeover switch, 1O1; L P CM signal processing circuit, 11 is a PCM signal output terminal, 12 to 14 are FM f4 voice signal input terminals, 15 to 17 are sound i
[M recording circuit, 18 to 2O are F iV1 audio signal output terminals, 21 to 23 are audio F'M reproduction circuit, 24
2 is a recording mode setting switch, 25 is a t-code detection circuit, 2
6 indicates a pilot signal generation processing circuit. Special RT presenter Sharp Co., Ltd. representative Patent attorney Hisabe Fukami (2 idiots)

Claims (2)

[Claims] (1) Includes a video head that performs magnetic recording using a helical scan method, and the winding angle of the magnetic tape on the drum is approximately 2
Magnetic recording and playback in which video signals and audio signals are frequency-modulated and recorded in C for the 180-degree area, and audio signals are recorded by pulse code modulation for the remaining approximately 30-degree area. A mode in which the device switches between a first mode in which a video signal is recorded and played back in the 180-degree area and a second mode in which a frequency-modulated multi-channel audio signal is recorded and played back in place of the video signal. Switching means, fl&&! an audio input terminal that receives each of the audio signals of the plurality of channels; a frequency modulation means that is provided corresponding to each of the audio signals of the plurality of channels and frequency modulates the corresponding audio signal with a carrier wave of a different frequency; and the mode switching means. In response to the first mode being selected by the means, one audio signal input to any of the plurality of input terminals is selected and applied to the corresponding frequency modulation means, and the output thereof is frequency modulated. corresponding frequency modulation means for recording the audio signal of each channel by superimposing it on the video signal, and in response to the second mode being selected by the mode switching means, the audio signal of each channel input to each of the input terminals. A magnetic recording and reproducing device is provided with means for superimposing and recording the respective outputs. (2) Further, a determining means for determining whether a synchronizing signal is included in the reproduced output of the signal recorded on the magnetic tape, and the determining means determines whether the reproduced signal includes a synchronizing signal. In response to the determination, the determination means demodulates a video signal and an audio signal from the reproduction signal, etc.; A magnetic recording and reproducing apparatus according to claim 1, comprising means for restoring an audio signal of.