JPH01157681A - Magnetic picture recording and reproducing device with image pickup device - Google Patents

Abstract

PURPOSE:To make the lead-in time of a phase system into 0 by presetting a synchronizing signal generator to generate the vertical synchronizing signal of a video signal recorded after the lead-in of the speed system of a rotary magnetic head, by means of a rotary phase signal to incidate the rotary phase of the rotary magnetic head. CONSTITUTION:A resetting pulse generator 13 to generate a resetting pulse synchronizing to the first rotary phase signal generated after the output of a speed lead-in detecting circuit 12 to detect a speed lead-in completion is generated, and the phase of a synchronizing signal generator 11 is preset by such a resetting pulse (c). Namely, after the rotating speed of the rotary magnetic head attains a prescribed speed, by the rotary phase signal of the rotary magnetic head, the synchronizing signal generating circuit 11 is preset so that the rotary phase signal and the output of the synchronizing signal generating circuit 11 can have a prescribed time difference. Thus, the lead-in of the phase can be speedily executed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording and reproducing device with an imaging means that is connected to a video camera as an imaging means and sequentially records video signals from the video camera on a magnetic tape by a rotating magnetic head. The present invention relates to an apparatus, and is particularly characterized by means for rapidly synchronizing the rotational phase of the rotary head with the vertical synchronization signal of the video signal at the start of recording.

2. Description of the Related Art Conventionally, there has been a camera-integrated rotating head type magnetic recording/reproducing apparatus which integrally combines a video camera and a rotating head type magnetic recording/reproducing apparatus and sequentially records video signals from the video camera. As is well known, in a rotary head type magnetic recording/reproducing apparatus, it is necessary to rotate the rotary magnetic head in phase synchronization with a vertical synchronization signal of a video signal to be recorded. FIG. 3 shows a drive system of a conventional rotary magnetic head. In FIG. 3, reference numeral 1 denotes a cylinder motor 3 which rotationally drives a rotating magnetic head (not shown), and a rotation speed signal having a frequency corresponding to the rotation speed of this motor 1 is generated by a rotation speed detector 2. The cylinder motor 1 is configured to rotate at a predetermined speed via a speed control circuit 3 and a motor drive circuit 4.

A rotational phase signal indicating the rotational phase of the rotary magnetic head (cylinder motor 1) is still generated by the rotational phase detection device 5. Reference numeral 12 denotes a speed pull-in detection circuit that detects when the rotational speed of the rotating magnetic head reaches a predetermined speed, and a phase control system (described later) uses a detection output that detects that the speed pull-in has been performed. The switch 14 is configured to close. On the other hand, in the camera section 6, an image pickup device 10 that converts an image into an electric signal is driven by the output of a synchronization signal generator 11, and the output video signal is sent to the video signal generator 9 and sent to the output of the synchronization signal generator 11. The video signal is converted into a video signal having a phase-synchronized vertical synchronization signal. On the magnetic recording and reproducing apparatus side, a vertical synchronization signal is extracted from this video signal by a synchronization separation circuit 8, and various control signals that lock at a certain phase with the rotational phase signal are sent to the motor via the switch 14 in a phase control circuit 7. It is added to the drive circuit 4, and phase control is performed so that the rotational phase of the rotating magnetic head is phase synchronized with the vertical synchronization signal of the video signal to be recorded.

Problems to be Solved by the Invention In the above configuration, when recording is started from a stopped state of the cylinder motor, there is no phase relationship between the rotational phase of the rotating magnetic head and the output of the synchronization signal generator at the time of starting recording. Approximately 4 to 6 seconds are required for the control operations from startup to speed pull-in and phase pull-in, and the video signal is actually recorded on the tape after this time, sometimes causing the timing of recording to be missed. The present invention aims to improve these various conventional problems, and aims to shorten the pull-in time of the phase system at the start of recording, so that recording can be started quickly when the recording start button is pressed.

Means for Solving the Problems The magnetic recording/reproducing device with an image pickup device of the present invention has a rotational phase signal that is predetermined to indicate the rotational phase of the rotating magnetic head at the same time as the speed system retraction of the Heno magnetic head is completed. The synchronizing signal generator on the video camera side is preset so that the vertical synchronizing signal is generated with a delay of the same amount of time.

According to the above configuration, by presetting the synchronizing signal generator that creates the vertical synchronizing signal of the video signal to be recorded after the speed system of the rotating magnetic head is pulled in with the rotational phase signal indicating the rotational phase of the rotating magnetic head, Since the vertical synchronization signal and the rotational phase of the rotary magnetic head are instantaneously synchronized, the phase system pull-in time becomes zero, and a faster phase synchronization state can be obtained.

Example Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a phase synchronization device of a magnetic recording and reproducing device with an imaging device according to an embodiment of the present invention, and the same constituent blocks as those of the conventional example in FIG. There is. The difference from the conventional example is that the output of the speed pull-in detection circuit 12 (second
The first rotational phase signal (second
A preset pulse generator 13 is provided which generates a reset pulse (FIG. 2C) in phase synchronization with FIG. . That is, after the rotational speed of the rotary magnetic head reaches a predetermined speed, the rotational phase signal of the rotary magnetic head causes the output d of the synchronization signal generation circuit 11 to change in advance. The synchronizing signal generating circuit 11 is preset to have a predetermined time difference ΔT.

According to the above configuration, when the rotation of the magnetic head reaches a predetermined speed and the phase control system operates, the rotational phase of the rotating magnetic head and the phase of the vertical synchronization signal of the video signal are
The same predetermined phase difference (time difference Δ
Since the phase is precented with T ), the phase pull-in occurs very quickly.

Effects of the Invention As described above, according to the present invention, the pull-in time of the rotary magnetic head during recording is significantly shortened, and the recording start operation can be performed quickly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the main parts of an embodiment of the magnetic recording and reproducing device with an imaging device of the present invention, FIG. 2 is a waveform diagram for explaining the operation of the device, and FIG. 3 is a conventional magnetic recording and reproducing device. FIG. 2 is a block diagram showing the main parts of the device. 1. Cylinder motor, 2.. Rotation speed detection circuit, 3.. Speed control section, 4.. Motor drive, 5.. Rotation phase detector, 6..・
・Camera section, 7... Phase control section, 8...
Sync separator, 9... Video signal generator, 10.
... Imager, 11 ... Synchronization signal generator,
12... Speed retraction detector, 13...
Prisenotohalus generator, 14...Switching circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure α −−□−−−− Figure 3/, [Y■]] 47 Entry Prizetno V Lus

Claims (1)

[Claims] an imaging means for generating a video signal having a vertical synchronization signal phase-synchronized with the output signal of the synchronization signal generation means; a rotary magnetic head for sequentially recording the video signal on a magnetic tape; and a drive for rotationally driving the rotary magnetic head. a speed control means for controlling the drive means so that the rotational speed becomes a predetermined speed; and a speed control means for controlling the drive means so that a rotational phase signal indicating a rotational phase of the rotary magnetic head and a vertical synchronization signal of the video signal are synchronized. a phase control means for controlling the rotation speed of the rotating magnetic head; a speed detection means for detecting that the rotation speed of the rotary magnetic head reaches a predetermined speed at the start of recording; A magnetic recording and reproducing apparatus with an imaging device, comprising means for controlling the synchronizing signal generating device using a phase signal and presetting the phase of the output signal so as to have a predetermined phase relationship with the rotational phase signal.