JPS63219283A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a reproducing image in which no noise is included and synchronization is taken, by providing an output control means, and prohibiting the storage of a picture signal obtained by reproduction on a storage output means until a recording medium is moved stably. CONSTITUTION:At the time of reproducing a magnetic tape 11 on which recording with the prescribed pitch of a control signal is performed, a stored image is outputted in order as storing a picture signal reproduced by a rotary head 15 once in a storage output circuit 19 in order. When the reproduced pitch of the control signal is changed in the middle of reproduction, an output control circuit 20 prohibits the storage of the reproducing picture signal including the noise due to the head 15 on the circuit 10 from a time when a changed pitch is reproduced. And the picture signal stored in the circuit 19 is outputted. In such a way, it is possible to obtain the reproducing image in which no noise exists and the synchronization is taken.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording/reproducing apparatus in which the transfer speed of a recording medium during recording and reproduction can be switched between at least two types, and particularly for VTRs and EVRs.

It is most suitable for use in tape recorders, etc.

2. Description of the Related Art A conventional recording/reproducing apparatus will be described below with reference to the drawings. In a recording and reproducing apparatus such as a VTR that records video signals on a magnetic tape and reproduces the video signals using the magnetic tape, it is conceivable that the tape feeding speed during recording and reproduction is switched in two consecutive ways.

That is, during recording, the magnetic tape feed speed is set to a predetermined first speed.
(hereinafter abbreviated as vs) and a predetermined second speed smaller than 3 (hereinafter abbreviated as vo).

During recording, a control signal and an image signal for controlling the transport speed of the magnetic tape are recorded on the magnetic tape. The operation when reproducing the magnetic tape will be explained. FIG. 2 is a block diagram of the main parts of a conventional recording and reproducing apparatus during reproduction. In FIG. 2, a magnetic tape 1 includes a capstan 2a and a pitch roller 2b, which are part of a recording medium transport means 2.
and is transferred by the rotation of the capstan 2a. At the same time, the magnetic tape 1 is in contact with an audio control head (hereinafter abbreviated as A/C head) 3, and the control signal recorded on the magnetic tape 1 is reproduced. If the pitch of this control signal is a predetermined pitch Ps, the speed is V3 or the predetermined pitch P. In this case, the magnetic tape 1 is rotated at a speed of ■8 while aligning the phase with the rotating head 5 mounted on the cylinder 4.
A transfer speed switching circuit 6 controls the rotation of the capstan 2a to transfer the capstan 2a. At the same time, the image signal recorded on the magnetic tape 1 obtained from the rotary head 5 is transmitted to the signal processing circuit 7.
It is transmitted to the monitor TV8 through. the monitor tv
8 displays a well-synchronized and beautiful reproduced image.

Problems to be Solved by the Invention However, as mentioned above, there are two transport speeds for the magnetic tape 1: (3) and (6). ■It may be possible to switch to speed 8. FIG. 3 shows the relationship between the magnetic tape transport speed and time at that time. When the transfer speed is switched from v5 to Ve, the transfer speed suddenly changes from ■3 to ■. As shown in FIG. 3, the tape transport speed is - due to the inertia of the capstan motor (not shown). It takes time (tl) to converge to the speed of vo.During this time, the pitch of the control signal recorded on the magnetic tape l is the pitch Ps at speed ■5 and the pitch Ps at speed ■. Unlike the pitch P8, this is a variable pitch that corresponds to the varying speed.

When playing back a magnetic tape recorded as described above, with the above configuration, if the pitch of the control signal becomes a variable pitch (section 11 in Figure 3) during playback, the pitch of the control signal changes the pitch of the capstan 2a. Since the rotation is controlled, the rotation speed of the capstan 2a is accelerated or decelerated in accordance with the fluctuating pitch. However, due to the gi characteristics of the capstan motor (not shown),
The rotation of the capstan motor 2a cannot be followed properly.

As a result, the rotating head 5 comes off the image signal track recorded on the magnetic tape 1, and the image signal obtained by the rotating head 5 contains noise etc.
The problem is that an image signal with noise is sent to the monitor, resulting in an extremely difficult to see image.

In view of the above problems, when reproducing a magnetic tape recorded at a pitch of a predetermined control signal, the present invention first sequentially stores the reproduced image signals by the rotary head in the storage output means, and then outputs the stored image signals. If the pitch of the control signal played back is no longer the specified pitch during playback, the noise caused by the rotating head will be removed from the time the variable pitch is played back until the tape transport speed stabilizes at the specified speed. By outputting the image signal already stored in the memory output means without storing the reproduced image signal containing the image in the memory output means, it is possible to obtain a clean, noise-free and synchronized reproduced image. The present invention provides a recording/playback device.

Means for Solving the Problems In order to solve the above problems, the recording and reproducing apparatus of the present invention includes:
During recording, the recording medium is transported at at least two different speeds.
recording medium transport means for selectively switching between types of recording media, control signal reproducing means for reproducing control signals recorded on the recording medium at a pitch corresponding to the transport speed during reproduction, and a period of the control signal. A recording/reproducing apparatus comprising a transfer speed switching means capable of determining the transfer speed of the recording medium during playback and switching the transfer speed of the recording medium to the same speed as during recording, the apparatus comprising:
When a control signal of a different pitch is reproduced by the storage output means which outputs the stored image signal while sequentially storing image signals equal to or more than a field, and the control signal reproduction means at the time of reproduction, from that point on, a new control signal is reproduced. Until the recording medium is stably transported at a transport speed corresponding to the pitch of the reproduced control signal, the image signal obtained by reproduction is not stored in the storage output means,
The apparatus is further provided with an output control means for outputting the image signal stored in the storage output means instead of the image signal obtained by reproduction.

Effects of the present invention With the above-described configuration, when the tape transport speed is changed during recording due to reasons such as a small remaining amount of the magnetic tape, fluctuations in the tape transport speed occur during playback, and as a result, the tape transport speed changes on the magnetic tape. It is possible to solve the problem that the rotary head is deviated from the recorded image signal track, and the image signal accompanied by noise is sent to the monitor TV, resulting in an extremely difficult to see image being displayed.

Embodiment Hereinafter, a recording/reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of the main parts of a recording and reproducing apparatus according to an embodiment of the present invention during reproduction. In FIG. 1, a magnetic tape 11 is held between a capstan 12a and a pitch roller 12b, which are part of a recording medium transport means 12, and is transported by the rotation of the capstan 12a. At the same time, the magnetic tape 11 is in contact with the A/C head 13, and the control signal recorded on the magnetic tape 11 is reproduced.

If the pitch of this control signal is a predetermined pitch Ps, the speed is ■8, or if the pitch is a predetermined pitch Pe, the speed is ■. A transfer speed switching circuit 16 controls the rotation of the capstan 12a in order to transfer the magnetic tape 11 at a speed of 12a while matching the phase with the rotary head 15 mounted on the cylinder 14.

At the same time, the image signal recorded on the magnetic tape 11 is reproduced by the rotary head 15, and while the reproduced image signal is temporarily stored in the storage output circuit 19 for two frames sequentially, the image signals stored in the image signal are sequentially stored in the order of oldest image signal. Output sequentially. The output image signal is passed through the signal processing circuit 17 to the monitor TV1.
8, and a well-synchronized and beautiful reproduced image is displayed.

When the pitch of the reproduced control signal is no longer the predetermined pitch during reproduction, the output control circuit 20
From the time when this fluctuating pitch is played until the tape transport speed stabilizes at a predetermined speed ((t1 section in Figure 2))
During this period, the image signal reproduced by the rotary head 15 is not stored in the storage output means, but the image signal already stored in the storage output means is outputted to the signal processing circuit 17. Further, when the transfer speed switching circuit 16 determines that the tape transfer speed has stabilized at a predetermined speed based on the playback signal from the control signal playback circuit 13, the playback image signal by the rotating shaft 15 is once again transferred to the storage output circuit 19. While sequentially storing two frames, the stored image signals are sequentially output in order of oldest to oldest.

The operation of the recording and reproducing apparatus configured as described above during reproduction will be explained.

If you play back a magnetic tape whose tape transport speed has been changed during recording due to insufficient remaining magnetic tape, etc., the pitch of the control signal will fluctuate (
In the +11 interval in FIG. 3), since the rotation of the capstan 12a is controlled by the pitch of the control signal, the rotation speed of the capstan 12a is accelerated or decelerated in accordance with the fluctuating pitch. However, due to the inertia of the capstan motor (not shown), the rotation of the capstan 12a cannot be properly followed. As a result, the rotary head 15 deviates from the image signal track recorded on the magnetic tape 11, and the image signal obtained by the rotary head 15 contains noise. However, from the time when the control signal reproducing circuit 13 reproduces the variable pitch, the image signal containing noise generated by the rotary head 15 is not stored in the storage output means by the output control circuit 20. Therefore, the output control circuit 20 outputs the noise-free image signal already stored in the storage output means to the monitor TV 1B.
By continuing to output the signals to the monitor TV 18, a clean, noise-free and synchronized image can be displayed on the monitor TV 18. Further, when the transfer speed switching circuit 16 determines that the tape transfer speed has stabilized at a predetermined speed based on the playback signal from the control signal playback circuit 13, the output control circuit 20 again temporarily stores the playback image signal by the rotary head 15. Two frames are sequentially stored in the output circuit 19, and the stored image signals are sequentially output in order of oldest to oldest. Therefore, the same image signal continues to be output to the monitor TV 1B during this time, but this (11 section) is generally about 0.3 seconds to 0.5 degrees, so there is no problem.

Effects of the Invention As described above, the recording and reproducing apparatus according to the present invention includes a recording medium transporting means that selectively switches the transporting speed of the recording medium to at least two different types during recording, and a recording medium transporting means that selectively switches the transporting speed of the recording medium to at least two different types during recording;
a control signal reproducing means capable of reproducing a control signal recorded on the recording medium at a pitch corresponding to the transport speed; and a control signal reproducing means that determines the period of the control signal so that the transport speed of the recording medium during reproduction is the same as that during recording. A recording/reproducing apparatus comprising: a transfer speed switching means that can switch between different speeds; When a control signal with a different pitch is reproduced by the control signal reproducing means during reproduction, from that point on, the recording medium is stably transported at a transport speed corresponding to the pitch of the newly reproduced control signal. and an output control means that does not cause the storage output means to record the image signal obtained by reproduction, and outputs the image signal stored in the storage output means instead of the image signal obtained by reproduction. During recording, the tape transport speed was changed due to low remaining capacity of the magnetic tape, etc., and as a result, the tape transport speed fluctuated during playback, resulting in the image recorded on the magnetic tape being changed. The rotating head becomes detached from the signal trunk, and the image signal obtained by the rotating head becomes noisy. However, due to the output control circuit, from the time when the control signal reproduction circuit reproduces the variable pitch, the image signal containing noise caused by the rotating head is not stored in the storage output means, and the noise-free image signal already stored in the storage output means is stored. By continuing to output the signal to the monitor TV, it is possible to display a clean, noise-free, synchronized image on the monitor TV.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the main parts of a recording/playback device according to an embodiment of the present invention during playback, FIG. 2 is a block diagram of the main parts of a conventional recording/playback device during playback, and FIG. 3 is a tape transfer during recording. FIG. 3 is a relationship diagram showing the relationship between the magnetic tape transfer speed and time when the speed is switched. 11...Magnetic tape, 13...A/C
Head (audio control head), 15.
... Rotating head, 19 ... Memory output circuit, 20 ... Output control circuit.

Claims (1)

[Claims] During recording, the recording medium is transported at at least two different speeds.
recording medium transport means for selectively switching between types of recording media, control signal reproducing means for reproducing control signals recorded on the recording medium at a pitch corresponding to the transport speed during reproduction, and a period of the control signal. A recording/reproducing apparatus comprising a transfer speed switching means capable of determining the transfer speed of the recording medium during playback and switching the transfer speed of the recording medium to the same speed as during recording, the apparatus comprising:
When a control signal of a different pitch is reproduced by the storage output means which outputs the stored image signal while sequentially storing image signals equal to or more than a field, and the control signal reproduction means at the time of reproduction, from that point on, a new control signal is reproduced. Until the recording medium is stably transported at a transport speed corresponding to the pitch of the reproduced control signal, the image signal obtained by reproduction is not stored in the storage output means,
A recording and reproducing apparatus characterized in that the apparatus further comprises an output control means for outputting an image signal stored in the storage output means instead of an image signal obtained by reproduction.