JPS62166671A - Rotary head type magnetic picture recording and reproducing device - Google Patents

Abstract

PURPOSE:To record voice continuously for a long time by writing frame omitted video signals in a frequency dividing circuit in a tape driven at fixed speed, and at the same time, writing continuously by a fixed voice head and a voice recording and reproducing circuit in other tracks separately from video signals. CONSTITUTION:A tape 10 is driven by holding it between a capstan 5 and a pinch roller 9 and run at the fixed speed. Inputted video signals are amplified by a video recording amplifier 13, and recording current is let flow in video heads 2 and 3. On the other hand, vertical synchronizing signals are separated by a synchronizing separator circuit 15 and applied to a cylinder driving circuit 17 to rotate a rotary cylinder 15 and applied to a cylinder driving circuit 17 to rotate a rotary cylinder 1 at the fixed speed. At the same time, frequency divided by a frequency dividing circuit 16 and a gate is controlled as a frame omitting control signal, and the current of the video heads 2, 3 is made on and off. Further, recording current is let flow in a voice head 4 by a voice recording circuit 18 and voice is recorded continuously. Thus, video signals are frame omitted, and voice can be recorded at the same time for a long time while making video recording for a long time.

Description

[Detailed Description of the Invention] Field of Industrial Application The present invention relates to a rotating head type magnetic recording/reproducing device, and is particularly effective when used in a device that performs frame-by-frame recording of video television signals and records them over a long period of time. be.

2. Description of the Related Art In recent years, long-duration videotapes using frame-by-frame recording have become popular.
It is widely used for surveillance and security purposes in areas such as the Qin-Russia Lagoon Pass.

Problems that the invention aims to solve In time-lapse video, a magnetic tape (hereinafter referred to as tape) is intermittently driven for long-term recording, and a fixed audio head cannot be used for frame-by-frame recording. The problem is that audio cannot be recorded.

In view of the problem described in L, the present invention is a rotating head type magnetic recording/playback system that enables long-term recording of not only video but also audio by continuously driving the tape and recording video signals frame-by-frame. The aim is to provide equipment.

Summary of Means for Solving the Problems In order to solve the problems, the rotary head type magnetic recording and reproducing apparatus of the present invention has a capstan that drives the tape at a constant speed, and a rotary shilling for recording video. The system consisted of a pair of video heads attached to the frame, a frequency divider circuit for determining frame-by-frame timing, a fixed audio head for recording audio, and a recording/playback circuit.

Function The present invention has the configuration shown in L. A video signal, which is frame-by-frame extracted by a frequency dividing circuit, is written on a tape driven at a constant speed by a pair of video heads attached to a rotary spool, and a fixed audio head and an audio signal are written on a tape driven at a constant speed. With the recording and reproducing circuit,
It becomes possible to continuously write on a track different from the video signal.

Therefore, in addition to long-time video recording using frame-by-frame recording, continuous audio recording is also possible.

Embodiments Hereinafter, rotary head type magnetic recording and reproducing apparatuses according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic diagram of a mechanism according to an embodiment of the present invention. In Fig. 1, reference numeral 1 denotes a rotary shilling, on which a pair of video heads (video head (L) 2 and video head cR) 3) with opposite azimuths are attached to record and reproduce video signals. . Reference numeral 4 denotes a fixed audio head for recording and reproducing audio. Reference numerals 5 to 12 are mechanisms related to tape running, and the capstan 6 rotates at a constant speed as the rotation of the capstan motor is transmitted at a reduced speed by the belt 7 and the capstan flywheel 8. tape 1
o is driven between the capstan 5 and the pinch row 29, and runs at a constant speed. Reel stands 11 and 12 are used to supply and wind up the tape. Second
The figure is a 0.7 scale diagram during recording, and FIG. 3 shows a timing chart.

Hereinafter, frame-by-frame video recording and audio recording will be explained using FIGS. 2 and 3. Reference numeral 13 denotes a video recording amplifier, which amplifies the input video signal and supplies a recording current to the video heads 2 and 3. 15 is a synchronization separation circuit, which is a circuit for separating a vertical synchronization signal from an input video signal. The separated vertical synchronization signal is applied to the cylinder drive circuit 17 and serves as a reference signal for keeping the rotary cylinder 1 at a constant rotation.At the same time, the frequency is divided by the frequency dividing circuit 16 and becomes a control signal for frame-by-frame recording. 14 is a recording gate circuit, which controls the gate of the signal amplified by the video recording amplifier 13 in accordance with the time-frame control signal output from the frequency dividing circuit 16;
and 3, to turn on and off the current of the video head. Reference numeral 18 denotes an audio recording circuit, which supplies a recording current to the audio head 4 to continuously record audio. FIG. 3 is a timing chart showing, from top to bottom, a video signal, a vertical synchronization signal separated by 15 synchronization separation circuits, video head switching timing, a frame-by-frame control signal, and an audio recording signal. As shown in this timing chart, the video signal is intermittently recorded frame-by-frame at the timings of people, B, C, and D, whereas the audio signal is recorded continuously.

As described above, according to this embodiment, by using the mechanism that drives the tape at a constant speed and the circuit that performs frame-by-frame recording, it is possible to simultaneously record long-term video and to record fixed audio by driving the tape at the constant speed. It is now possible to record audio using the head. In addition, in the ``Raishing copper 1'' of the 1st series, a fixed-speed tape is used, but the capstan motor and the capstan are directly connected, and the rotation of the motor is controlled, and the tape is kept at a constant speed. It may also be driven. Furthermore, although a pair of video heads with opposite azimuths were used, video heads with the same azimuth may also be used.

Effects of the Invention As described above, according to the present invention, it is possible to extract frames from a video signal, and to record long-term video while simultaneously recording long-term audio.

[Brief explanation of drawings]

FIG. 1 is a schematic structural diagram of a mechanism of an embodiment of the present invention, FIG. 2 is a block diagram during recording in the embodiment, and FIG. 3 is a timing chart in the embodiment. 1...Rotating shilling, 2...Video head (L), 3...Video head), 4...
...Audio head, 5...Capstan, 1
6... Frequency dividing circuit, 18... Audio recording circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Atlas 3

Claims (1)

[Claims] Equipped with a capstan that drives the tape at a constant speed, a pair of video heads attached to a rotating cylinder, and a frequency dividing circuit to obtain frame-by-frame timing, the video signal is recorded frame-by-frame and a fixed audio head. A rotary head type magnetic recording and reproducing device characterized by having an audio recording and reproducing circuit that enables long-term recording of audio.