JPS6236733A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain the reproduction at an FM signal level with a single VTR by increasing the diameter of a rotary drum and switching the record and reproduction among plural heads in order to perform both the record and reproduction at a time. CONSTITUTION:The signals recorded on the 1st magnetic tape 10 are reproduced by the R and L azimuth heads 13a and 14a respectively. This head output is equal to the reproduction head detecting signals 20 and sent to an FM signal processing circuit 19. Then the recording and reproducing signals are sorted by the circuit 19 and the recording FM signal 21 is delivered. The signal 21 is recorded on the 2nd magnetic tape 11 by the R and L azimuth heads 13b and 14b respectively. The changeover of those heads and the control of the drum revolutions are carried out when a drum/head control circuit 18 receives the head position detecting signal 15 and delivers the head control signal 16 and the drum control signal 17. Then the R and L azimuth heads 13 and 14 as well as the record and reproduction modes are switched by the signal 16. While the signal 17 is used for control of the drum at the fixed number of rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing apparatus which performs duplication.

[Conventional technology]

Figure 3 shows a conventional magnetic recording/reproducing device (hereinafter referred to as VTR)
This figure shows a method of copying, that is, dubbing, using the following, and FIG. 2 is a block diagram of signal processing during copying. In the diagram,
8 is a first VTR 19 is a second VTR, 1 is a video head for detecting signals recorded on a magnetic tape, 2 is an FM signal processing circuit, 3 is an FM detection circuit, 4 is a video signal, 5 is a video signal processing circuit , 6 is an FM modulation circuit, and 7 is a video head.

Next, the operation will be explained. The signal detected from the video head 1 is processed by the FM signal processing circuit 2, and then the FM signal from the FM signal processing circuit 2 is subjected to FM detection and signal processing by the FM detection circuit 3. This output is the video signal 4. be. The processing up to this point is performed on the first VTR 8, and then the video signal 4, which is the output from the 117th) VTR 8, is transferred to the second VTR 8.
The video signal 4 is input to the VTR 9, and the video signal 4 is subjected to signal processing in the video signal processing circuit 5, and further subjected to FM modulation in the FM modulation circuit 6 for signal processing. This output is recorded by the video head 7.

[Problem that the invention seeks to solve]

Since duplication with a conventional VTR was performed as described above, two VTRs were required, and since all signal processing for playback and recording was performed on the two VTRs, the luminance signal in the video signal and the S/N of the color signal deteriorates, etc.
There was a problem in that the image quality deteriorated significantly.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a magnetic recording and reproducing apparatus that can reproduce reproduced FM signals as they are with a single VTR.

[Means for solving problems]

The magnetic recording/reproducing device according to the present invention has a drum having a large diameter so that a plurality of video heads can contact two magnetic tapes at the same time, and also enables switching between reproduction and recording of the plurality of video heads. By simultaneously playing back and recording on two magnetic tapes, it is possible to directly reproduce the FM signal as it is.

[Effect]

In this invention, the diameter of the drum is made larger than that of conventional drums so that multiple video heads can contact two magnetic tapes at the same time, and the multiple video heads can be switched between playback and recording. Therefore, same-VT
Recording and playback can be performed simultaneously on R, and duplication can be performed using FM signals.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a magnetic recording/reproducing apparatus according to an embodiment of the present invention, in which lO is a first magnetic tape on which a signal to be copied is written, and 11 is a magnetic tape 10 whose contents are to be copied. This is the second magnetic tape. Reference numeral 12 denotes a drum to which a rotating video head is attached, and the diameter of the drum is twice that of a normal drum so that two magnetic tapes can be pressed at the same time. 13a and 13b are R azimuth heads, and 14a and 14b are L azimuth heads.

Further, 15 is a position detection signal for each head, 16 is a control signal for each head, and 17 is a drum control signal.

18 is a head that controls each head and drum rotation;
This is the drum control section. 19 is an FM signal processing circuit;
20 is a reproducing head detection signal output from the reproducing head, and 21 is a recording FM signal written on the magnetic tape by the recording head.

The operation of the magnetic recording/reproducing apparatus configured as described above is performed by N
A case where the method is applicable to a TSC type VTR will be explained as an example.

Drum 1, twice the diameter of the normal one, with a rotating head attached
2 is fixed horizontally, the winding angle of the magnetic tape is a little over 90 degrees, and the rotational speed of the drum is the same as that of the current NTSC system. The first and second magnetic tapes 10 and 11 are wound around the horizontally mounted drum 12 at an angle of 5° and 5B'99'', and the tape feed speed is the same as that of the current NTSC system.

Other similar configurations can be used to conform to the NTSC format.

The signals recorded on the first magnetic tape 10 are reproduced by the R and L azimuth heads 13a and 14a.

This head output is the playback head detection signal 20, and the FM
The signal is sent to a signal processing circuit 19, which divides it into a reproduction signal and a recording signal, and outputs a recording FM signal 21.
This signal is recorded on the second magnetic tape 11 by the R and L azimuth heads 13b and 14b. At this time, the head switching and drum rotation control are performed by the drum head control circuit 18 receiving the head position detection signal 15 and the head control signal 16. This is done by outputting the drum control signal 17, and the head control signal 16 allows R,
Switching control and playback of L azimuth heads 13 and 14,
Recording is being switched. Further, the drum control signal 17 controls the rotational speed of the drum to be constant.

In this embodiment with such a configuration, it is possible to read data on one magnetic tape while simultaneously recording data on the other magnetic tape using the same azimuth head.

In the above embodiment, the size of the drum, the inclination of the magnetic tape, and the number of heads per rotation were set to comply with the NTSC VTR standard.

The numerical value is an example, and other numerical values may be used, and the same effect will be achieved.

Alternatively, by simultaneously inputting another recording signal from the outside while playing one magnetic tape, it is also possible to record an external signal on the other magnetic tape while playing one magnetic tape. .

〔Effect of the invention〕

As described above, according to the present invention, the diameter of the rotating drum is increased and the reproduction/recording of a plurality of heads is switched so that simultaneous reproduction and recording can be performed. There is an effect that can be achieved by

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIGS. 2 and 3 are block diagrams showing the configuration when duplicating with a conventional VTR. 10...First magnetic tape, 11...Second magnetic tape, 12...Drum, 13...R azimuth head, 14...Shi azimuth head, 15...Head position detection signal , 16... Head control signal, 17... Drum control signal, 18... Drum head control section, 19.
... FM signal processing circuit, 20... Playback head detection signal, 21... FM signal for recording. Figure 1

Claims (1)

[Claims] (1) A drum having a plurality of video heads and having a diameter such that two magnetic tapes can be simultaneously pressed onto the outer peripheral surface of the drum, and a drum capable of reproducing the contents of one of the magnetic tapes and recording it on the other tape at the same time. A magnetic recording/reproducing apparatus comprising head control means for switching between reproduction and recording of each of the video heads.