JPH03183066A - Still video reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a still video reproducing device, and more specifically to a still video reproducing device having a communication function with the outside.

[Prior Art] Conventionally, a device has a communication function with a computer, and in response to a request from the computer, ID information recorded on a track being played back on a magnetic disk along with an image signal is transmitted along with status information of the track being played back. Still video playback devices that transmit to a computer have been proposed. However, in this still video playback device, when there is no ID information such as an unrecorded track, only status information is sent, and the operating status of the still video playback device can be managed on the computer side. .

[Problem to be Solved by the Invention] However, in the above conventional example, even if the still video playback device is communicating with a computer or is under control by a computer, the still video playback device cannot be operated independently. Therefore, the computer's recognition of the current state of the still video playback device may not match the actual state of the still video playback device.

For example, if the computer cannot prohibit replacement of the magnetic disk that is the recording medium, or if the computer cannot know when to replace the magnetic disk, replacing the magnetic disk will erase the ID information stored in the computer. Although the ID information is meaningless, it has the disadvantage that the still/video playback device is controlled according to the ID information.

Therefore, it is an object of the present invention to provide a still video playback device that does not cause such a situation.

[Means for Solving the Problems] A still/video playback device according to the present invention is a still/video playback device that is equipped with a communication means with an external device and plays back images recorded on a recording medium. The present invention is characterized in that a detecting means for detecting exchange is provided, and the communication means transmits the exchange of the recording medium to an external device.

[Operation] The above means allows the external device to know that the recording medium has been replaced. Therefore, it is possible to prevent the user from instructing an erroneous reproduction operation without knowing that the recording medium should be replaced.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a block diagram of an embodiment of the present invention. 1
0 is an outstanding still/video playback device. In the still video playback device 10, numeral 11 has 50 concentric tracks, and numeral 12 is a magnetic disk that can record a field image signal and its ID information on each track. A head unit consisting of a magnetic head, 14 is a magnetic disk 11
16 is a spindle motor that rotates the motor 14 at a predetermined rotation speed; 16 is a servo circuit that controls the rotation speed of the motor 14; and 18 is a servo circuit that controls the two heads CH1 of the head unit 12 in accordance with a head switching signal from a system control circuit 26, which will be described later. , CH2, and 20 is a video reproduction circuit that reproduces and outputs a video signal from the output of the preamplifier 18.

22 is an ID demodulation circuit that demodulates ID data from the output of the preamplifier 18. Note that the ID data is DPSK modulated and recorded. According to the standards of electronic still cameras, the ID data includes information for determining field recording or frame recording, track address, recording date information, and the like.

24 is a disk loading detection circuit that detects loading of the magnetic disk 11. The disk loading detection circuit 24 also
It is also a circuit that detects replacement of the magnetic disk 11. 26
is a system control circuit that controls the entire still/video playback device shown in the figure.

The system control circuit 26 applies a head switching signal of the head unit 12 to the preamplifier 18 in accordance with the field/frame recording discrimination information of the reproduced ID data. 28 is an interface circuit for communication with the computer 30, 32 is an output terminal for the reproduced image signal reproduced by the video reproduction circuit 20, and 34 is a video printer that prints out the reproduced image signal output from the output terminal 32. It is. Video printer 34 is also under the control of computer 30.

The computer 30 communicates with the system control circuit 26 via the interface circuit 28 of the still video playback device 10 and controls the still video playback device 10.

For example, when computer 30 outputs a "motor stop" command to still video playback device 10, system control circuit 26 sends a servo circuit 16II-motor stop control signal to stop motor 14.

The computer 30 outputs an "ID transmission" command to the still video reproducing apparatus 10 in order to know the recorded image of the track where the magnetic head 12 is currently located. In response to this, the system control circuit 26 transmits the reproduced ID data output from the ID demodulation circuit 22 as is to the computer 30 via the interface circuit 28. At the time of this transmission, the system control circuit 26 controls the still video playback device 1.
A status signal indicating the current operating state of 0 is also transmitted to computer 30. Specifically, the status signals include the state of the magnetic disk 11, the recording state, and the D recording state.

Taking as an example a continuous printout in which the recorded images of the loaded magnetic disk 11 are sequentially reproduced and printed by the video printer 34, the computer 30 prints out the recorded images of one track, and then prints out the recorded images of the next track. The magnetic head unit 12 is sent, and the above-mentioned "ID"
The "send" command determines the status of the track and determines whether to print out the track.

At this time, the magnetic disk 11 is not under the control of the computer 30.
When the disk is replaced, the disk loading detection circuit 24 detects the disk replacement and notifies the system control circuit 26. System control circuit 26, in response to the "Send ID" command, informs computer 30 of this information, ie, that disk 11 has been replaced. This allows computer 3
0 can know the fact that the disk has been replaced.

[Effects of the Invention] As can be easily understood from the above explanation, according to the present invention, the side that controls the still video playback device
It is possible to reliably recognize the replacement of a recording medium in a video playback device, and therefore there is no possibility that the recording medium will be mistaken for a different recording medium.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention. 10 Nistil video playback device 11: Magnetic disk
12: Head unit 14 Nispindle motor
16: Servo circuit 18: Preamplifier 20: Video playback circuit 22: ID demodulation circuit 24: Disk loading detection circuit 26: System control circuit 28: Interface circuit 3o: Computer 32: Video output terminal 34
:Video printer

Claims (1)

[Claims] A still/video playback device that is equipped with a means of communication with an external device and plays back images recorded on a recording medium, the device is equipped with a detection means that detects exchange of the recording medium, and the communication means allows the exchange of the recording medium to be detected by the external device. A still/video playback device characterized in that it transmits data to.