JPH01109882A - Still video recorder - Google Patents

Abstract

PURPOSE:To apply no burden to a disk or a head and to execute a recording with no time delay by stopping the rotation of the disk at the time of a stand-by, temporarily storing a picture to be recorded in a memory at the time of recording, stabilizing the rotation of the disk and recording the picture stored in the memory. CONSTITUTION:At the time of a recording stand-by state, a system controller 6 instructs the memory 21 to rewrite the picture applied to an input terminal 9 for at every field. Therefore, the new picture is constantly updated in the memory 21. The disk 1 is not rotated. At the time of an ON state, the controller 6 applies a servo ON signal to a servo motor 2 to rotate the disk, temporarily interrupts the update of the memory 21, holds the contents of a storage, changes over a switch 23 to a (b) side, applies a reading signal to the memory synchronously with a PG signal immediately after a servo lock signal when the servo lock signal indicating that the rotation of the servo motor 2 is stabilized is impressed and the REC signal of one vertical synchronization to a recording amplifier 18 and records a recording signal on the disk 1 through the head 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a still video recording device capable of recording still images, and more particularly to a still video recording device that does not cause a time delay at the start of recording.

[Background of the Invention] In recent years, recording devices that record images on recording media such as floppy disks have been realized.

FIG. 3 is a block diagram showing an example of the configuration of such a recording device. In the figure, 1 is a disk serving as a recording medium;
2 is a servo motor that rotates the disk 1; 3 is a PG detector that detects the reference position when the disk 1 is rotating; 4
is the waveform shaping of the signal from the PG detector 3 mentioned above and the PG
A waveform shaper that creates a double signal, 5 is a switch that instructs to start recording, 6 is a system controller that generates a recording (RFC) signal from the first PG to the next PG after switch 5 is pressed, 7 is a head 8 is a head that records an image on the disk 1, 9 is an input terminal to which a video signal is applied from the outside, and 10 is a head drive circuit that moves the video signal to a predetermined track on the disc. 11 is a decoder that takes out color difference (R-Y, B-Y) signals from the C signal given from the Y/C separation circuit 10; 12 is a decoder given from the decoder 11; A line sequential circuit outputs the R-Y signal and the B-Y signal alternately for each scanning line (line sequential); 13 is an emphasis circuit that adjusts the frequency characteristics of the color difference signal; 14 is line sequential A color modulation circuit that performs FM modulation of a color difference signal, 1
5 is an emphasis circuit that adjusts the frequency characteristics of the luminance signal; 16 is a luminance modulation circuit that FM-modulates the luminance signal; 17 is a mixing circuit that mixes the FM-modulated luminance signal and the FM-modulated color difference signal; System controller 6
This recording amplifier amplifies the output of the mixing circuit 17 and supplies it to the head 8 as a recording signal when an RFC signal is applied thereto.

Before recording, the recording apparatus must be in a recording standby state in which the rotation of the disk 1 is synchronized with the video signal applied from the input terminal 8 in both speed 1 and phase. When the switch 5 is pressed in such a recording standby state, the video signal applied from the input terminal 9 is converted into the above-mentioned recording signal, and is recorded on the disk 1 from the head 8.

[Problems to be Solved by the Invention] When the recording device is in a recording standby state, the disk is rotating and the head and disk are in the rflta state. This friction causes wear on both the disk and the head, so it is undesirable for the recording standby state to continue. For this reason, if the recording standby state continues for a certain period of time (for example, 20 minutes),
It is configured to automatically release standby and stop rotation.

If an attempt is made to record after the recording standby state has been released, it will take nearly one second for the disk to start rotating and for the phases to be synchronized. This causes a time delay in recording, and there is a risk that a so-called photo opportunity may be missed.

The present invention has been devised in view of the above-mentioned problems, and its purpose is to record still video that can be recorded without placing any burden on the disk or head and without causing any time delay even in the recording standby state. The purpose is to realize the device.

[Means for Solving the Problems] The present invention, which solves the above problems, is a still video recording device that records an externally provided image as a still image on a recording medium. The apparatus is characterized in that it is configured such that the image stored in the memory is recorded on the recording medium when the recording medium becomes recordable.

[Operation] During recording, the recording medium is driven and at the same time the image to be recorded is stored in the memory. After the recording medium becomes recordable, the image stored in the memory is recorded on the recording medium.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, 1 is a disk serving as a recording medium, 2 is a servo motor that rotates the disk 1, 3 is a PG detector that detects the reference position when the disk 1 rotates, and 4 is a waveform shaping device for the signal from the PG detector 3. 5 is a switch that instructs to start recording, and 6 is a waveform shaper that generates a PGC signal from the first PG to the next PG after the switch 5 is pressed and the servo motors are synchronized. 7 is a head drive circuit that moves the head onto a predetermined track on the disk;
8 is a head that records images on the disk 1; 9 is an input terminal to which a gI4 image signal is applied from the outside; 10 is a Y/C separation circuit that separates the brightness (Y) and color (C) of the video signal; 1
1 is a decoder that extracts a color difference (R-Y, B-Y) signal from the C signal given from the Y/C separation circuit 10; 12 is a decoder that extracts the RY signal and BY signal given from the decoder 11; A line sequential circuit that outputs alternately every scanning line ($1 sequential); 13 is an emphasis circuit that adjusts the frequency characteristics of the color difference signal; and 14 is a color modulation circuit that performs FM modulation on the line sequential color difference signal. circuit, 15 is an emphasis circuit that adjusts the frequency characteristics of the luminance signal, and 16 is an FM5 circuit for adjusting the luminance signal.
The brightness modulation circuit 17 shown in FIG. l
A mixing circuit/circuit 18 mixes the li degree signal and the FM modulated color difference signal, and when the REC signal is applied from the system controller 6, the output of the mixing circuit 17 is amplified and sent to the head 8 as a recording signal. This is a recording amplifier that supplies 20 is an A/D converter that converts the video signal VIM into a digital signal, 21 is a memory that stores the video signal converted into a digital signal by the A/D converter 20, and 22 is an analog signal for the output of the memory 21. Convert to D/A
Based on the instructions from the system controller 6, the converter 23 connects the input of the Y/C separation circuit 10 to the input terminal 9 or the D/C separation circuit 10.
This is a switch for switching to either one of the A converters 22.

In the recording apparatus described above, when in a recording standby state, the system controller 6 instructs the memory 21 to rearrange the images applied to the input terminal 9 for each field.

Therefore, new images are constantly updated in the memory 21. Furthermore, at this point, the system controller 6 is not driving the servo motor 2, and the disk 1 is not rotating.

Here, it is assumed that the switch 5 is pressed manually or turned on by some external signal. The system controller 6 gives a servo ON signal to the servo motor 2, causing the servo motor to rotate the disk, and at the same time, temporarily suspends updating of the memory 21 to retain the stored contents. Further, the system controller 6 switches the switch 23 to the b side, thereby stabilizing the rotation of the servo motor 2. When a servo lock signal indicating that the rotation of the servo motor 2 has stabilized is applied to the system controller, the system controller 6 synchronizes with the PG double signal immediately after and sends a read signal to the memory 21 and a read signal to the recording amplifier 18. 1
Provides vertical synchronization RFC signal. This allows memory 2
The image content stored in 1 is converted back to an analog signal by the D/A converter 22, and then converted to a recording signal and supplied to the recording amplifier 18. The recording amplifier 18 has the above RFC
A signal is applied, and a recording signal is recorded on the disk 1 via the head 8.

With the above configuration, there is no need to keep the disk rotating during recording standby, and the image is stored in the memory at the time of recording, and the servo motor is synchronized and recording is possible before it is transferred from the memory to the disk. Since images are being transferred, problems such as wear of the disk and head during standby and time delays during recording can be solved.

FIG. 2 is a timing chart showing the operation of each part in the above embodiment.

FIG. 2(A) shows a video signal supplied to the input terminal 8 from the outside, and A, B, C, . . . are images of one different field. FIG. 2B shows a video signal of an image that is stored in the memory 21 and converted back to an analog signal by the D/A converter 22.

(c) shows the PG multiplied signal (d) detected by the PG detector 3 indicating the state of the switch 5, which is operated to record image B here. (E) is the servo O that the system controller 6 instructs the servo motor 2 to drive.
The signal N, (f) is a servo lock signal indicating that the servo motor 2 is synchronized in speed and phase, and (g) is an RFC signal generated by the system controller 6 during recording.

The operation of each part will be explained below. A video signal shown in (a) is applied to the input terminal 8, and the memory 21 constantly rewrites and updates this signal. Here, as shown in (d), if the switch 5 is pressed to perform recording at the moment of image 8 of country ■, the system controller 6
1 to cancel the update and retain the current contents. At this time, the memory 21 is inputting image 8, and after inputting this image B, it continues to hold this content from then on. At the same time, the system controller 6 gives a servo ON signal to the servo motor 2 to drive it. The time T1 from when the servo motor 2 is driven until it becomes synchronized is 1.
It takes about a second, so hold this. At this time, the memory 21 holds image B, and reads and outputs it as shown in (b). The signal of this image 9B continues to be supplied to the recording amplifier 18 as a recording signal. Servo motor 2
When the system controller 6 enters a synchronized state and generates the servo error signal shown in (f), the system controller 6 generates an RFC signal of one vertical period in synchronization with the PG double signal immediately after this, and applies it to the recording amplifier 18. The recording amplifier 18 records the image quality B signal on the disk 1 via the head 8 in accordance with this REC signal. The system controller 6 turns off the servo ON signal when the RFC signal falls, and stops the rotation of the servo motor. It also instructs the memory 21 to rewrite the input image and shifts to a standby state.

As explained above, in the present invention, since the disk is not rotating in the recording standby state, there is no fear of wear. Furthermore, during recording, the data is written to the memory once and recorded after the rotation of the disk has stabilized, so there is no need to worry about missing a photo opportunity due to the time it takes for the rotation to stabilize.

In the above embodiment, the memory 21 has been described as having a capacity for one screen, but if multiple images are to be recorded between servo 0 and servo N and servo lock, the memory 21 may be changed accordingly. This can be addressed by adding more memory (or increasing the memory capacity).

[Effects of the Invention] As described above in detail, according to the present invention, the rotation of the disk is stopped during recording standby, and the image to be recorded during recording is stored in the memory at once, so that the rotation of the disk is stabilized. Since it is configured to record images stored in memory from
A still video recording device capable of recording without causing time delay can be realized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a timing chart showing the operation of the present invention, and FIG. 3 is a block diagram showing the configuration of a conventional example. 1... Disk 2... Servo motor 6.
・System controller

Claims (2)

[Claims] (1) A still video recording device that records an externally provided image as a still image on a recording medium, which is equipped with a memory that stores the externally provided image, and when the recording medium becomes ready for recording. A still video recording device, characterized in that it is configured to record images stored in the memory onto a recording medium. (2) The storage contents of the memory are updated at regular intervals with images provided from the outside, and the structure is configured to interrupt updating of the storage contents and retain the current storage contents during recording, and this retained image is transferred to the recording medium. 2. A still video recording apparatus according to claim 1, wherein said still video recording apparatus records a still video.