JPH06261284A - Intermittent recorder - Google Patents

Abstract

PURPOSE:To prolong the service life of a rotary head and recording medium by storing digital-converted video signals in a memory and reading them in a batch at the time of recording. CONSTITUTION:The inputted analog video signal is made at the constant level by an AGC circuit 11 and amplified by an amplifier 12, then supplied to a switch 1. In the case of the intermittent recording with long intervals or the one-shot video recording, switches 1 and 5 are made at the (a) side and the recording is performed. In this case, the output signal of the switch 1 is digital- converted by an A/D converter 2 and intermittently stored in a memory 3 by plural screens. Then, when the storage amount to the memory 3 reaches the constant amount, signals are read in a batch. A D/A converter 4 converts them into analog signals. They pass the switch 5 and are amplified by a recording circuit 13 and recorded on a recording medium 16. Thus, the service life can be prolonged by reducing the number of contacts between a rotary head 15 and a recording medium 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermittent recording device such as a video tape recorder for intermittently recording video signals and the like.

[0002]

2. Description of the Related Art A surveillance video tape recorder (VTR) device for intermittently recording for a long time is used in a bank or a store.
Recently, a VTR has been widely used particularly, which can record the entry and exit of a car intermittently for a long time, and can reproduce the necessary content at a later date to check the recorded content.

A conventional intermittent recording apparatus will be described below with reference to the drawings. FIG. 3 is a circuit configuration example of a conventional intermittent recording device. In FIG. 3, the input signal is the AGC circuit 1
The level is set to 1 at a constant level, then amplified by an amplifier circuit 12, amplified by a recording circuit 13, sent to a video head 15 which is a rotary head, and controlled by a recording timing circuit 14, which is a recording medium cassette tape. 16 is recorded. The video head 15 is mounted on the cylinder,
It is driven by the rotary head drive circuit 7 to rotate.

In the case of intermittent recording with a short interval, the cylinder on which the video head 15 is mounted constantly rotates, the cassette tape 16 is intermittently run, and the recording timing circuit 14 controls only while the tape is running stably. Make a record.

In the case of intermittent recording with a long interval, during standby between recording, the cassette tape is stopped from running, the tape tension is released while the tape is wound around the cylinder, and the rotation of the cylinder is stopped. Recording is performed by applying tension to the tape, rotating the cylinder, and running the cassette tape.

[0006]

However, in the intermittent recording apparatus of the prior art, in the case of intermittent recording with a long interval, the cylinder is rotated every time recording is started, the cassette tape is run, and the running is stabilized. When the recording starts and the recording ends, the cassette tape stops running,
Since the operations of rewinding a little, loosening the tape tension, and stopping the rotation of the cylinder are repeated many times, there is a problem that the video head and the tape running system are quickly worn, and maintenance such as replacement of the video head occurs.

Further, in the case of intermittent recording with a short interval, there is a problem that the wear of the video head and the cassette tape is accelerated because the cylinder is constantly rotating.

In view of the above problems, it is an object of the present invention to provide an intermittent recording device having a video head, a tape running system, and a cassette tape having a long life.

[0009]

In order to solve the above problems, the present invention provides a memory means having a storage capacity for a plurality of screens for temporarily storing a video input signal, and a signal read from the memory means. A rotary head for recording on a recording medium, a rotary head driving means for driving the rotary head, and a control means for controlling the memory means and the rotary head driving means are provided.

[0010]

With the above-mentioned means, the control means controls the memory means to intermittently store the video input signal for a predetermined number of screens and then to read it all at once in a continuous manner.
Rotating head should be in a rotating state in the vicinity of the period including a period in which signals read continuously in a batch are recorded by the rotating head, and in a non-rotating state in other periods. The number of contacts between the rotary head and the recording medium is reduced by controlling.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an intermittent recording apparatus according to the first embodiment of the present invention. In FIG. 1, reference numerals 11 to 16 and 7 are the same as those in FIG. 3, and the same reference numerals are given to omit the description. 1 and 5 are switches for switching between a circuit (b side) similar to the conventional one and a circuit (a side) peculiar to this embodiment, 2 is an A / D converter for converting an analog video signal into digital, and 3 is an A / D. A memory for intermittently accumulating output signals of the converter 2 for a plurality of screens, 4 a D / A converter for converting a digital signal read from the memory 3 into an analog signal, 6 a memory 3 and a recording timing circuit 14 And a digital signal control circuit for controlling the rotary head drive circuit 7.

The operation of the intermittent recording apparatus of this embodiment having the above-mentioned configuration will be described. First, the input analog video input signal is set to a constant level by the AGC circuit 11, amplified by the amplifier circuit 12, and supplied to the switch 1.

In the case of intermittent recording with a long interval or during one-shot recording, the switches 1 and 5 are set to the a side for recording, and in the case of intermittent recording with a short interval or continuous recording, the switches 1 and 5 are used. Is recorded on the b side by a conventional method.

When the switch 1 is on the a side, the output signal of the switch 1 is converted from an analog signal to a digital signal by the A / D converter 2 and is intermittently stored in the memory 3 for a plurality of screens. When the accumulated amount in the memory 3 becomes a certain amount, the signals for the plurality of screens are read out in a batch, and D /
The digital signal is converted from an analog signal by the A converter 4, passes through the switch 5, is amplified by the recording circuit 13, is supplied to the video head 15, and is recorded on the cassette tape 16 according to the instruction of the recording timing circuit 14. Immediately before the time to be recorded, the rotary head drive circuit 7 starts the rotation of the rotary head, and when the recording for the plurality of screens is finished, the rotation is stopped.

The digital signal control circuit 6 controls writing and reading of a digital signal with respect to the memory 3, instructs the recording timing circuit 14 to the recording timing, and instructs the rotary head drive circuit 7 to rotate.

FIG. 2 shows a block diagram of an intermittent recording apparatus according to the second embodiment of the present invention. In the embodiment shown in FIG. 2, a digital video input signal is input and further recorded as a digital signal.
1, the amplifier circuit 12, the switches 1 and 5, the A / D converter 2, and the D / A converter 4 are deleted, and the amplifier circuit 17 is added. The basic operation is the same as that of the embodiment of FIG. .

As described above, according to the embodiment of the present invention, the number of contact between the video head and the cassette tape is reduced, and the life of the video head and the running system can be extended.

In the above embodiments, the case where the input signal is only the video input signal has been described, but the same applies to the case where an audio input signal or digital data is input.

Further, in the above embodiment, the rotation of the rotary head is stopped except when the recording is performed collectively, but the rotation head may be rotated at a low speed instead of stopping.

[0021]

As described above, according to the present invention, the video input signal is intermittently stored in the memory means for a predetermined number of screens, and it is read out at once, and the rotary head is rotated to record the video input signal. There is an effect that the wear of the head and the recording medium is reduced and the life of the rotary head and the recording medium can be extended.

[Brief description of drawings]

FIG. 1 is a block diagram of an intermittent recording device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of an intermittent recording device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a conventional intermittent recording device.

[Explanation of symbols]

 1 Switch 2 A / D Converter 3 Memory 4 D / A Converter 5 Switch 6 Digital Signal Control Circuit 11 AGC Circuit 12 Amplifying Circuit 13 Recording Circuit 14 Recording Timing Circuit 15 Video Head 16 Cassette Tape 17 Amplifying Circuit

Claims (3)

[Claims] 1. A memory means having a storage capacity for a plurality of screens for temporarily storing a video input signal, a rotary head for recording a signal read from the memory means on a recording medium, and a drive for the rotary head. The rotary head drive means and the control means for controlling the memory means and the rotary head drive means are provided, and the control means is such that, with respect to the memory means, the memory means intermittently outputs the video input signal for a predetermined screen. After that, the control is performed so that the data is stored in a batch and continuously read out, and a period during which the batched and continuously read signals are recorded by the rotary head is given to the rotary head drive means. An intermittent recording device characterized by controlling so as to be in a rotating state during a period in the vicinity thereof. 2. The rotating means according to claim 1, wherein the control means causes the rotary head drive means to rotate for a period in the vicinity thereof including a period in which signals read continuously in a batch are recorded by the rotary head. The recording apparatus is controlled so that it is in the non-rotating state during the other period. 3. The rotating means according to claim 1, wherein the control means rotates the rotary head driving means in a period in the vicinity thereof including a period in which signals read continuously in a batch are recorded by the rotary head. The intermittent recording apparatus is controlled so that it is in the low speed rotation state during other periods.