JPS58121112A - Recorder of information signal - Google Patents

Abstract

PURPOSE:To give an assured compensation to a dropout, by recording an original signal to a recording region different from the region of an information signal in case an information region different from an original information signal exists after a comparison given between the reproduced information signal and the original information signal. CONSTITUTION:The 3rd switch 48 is switched with a control signal SS in a section where a dropout occurs, and the output of a memory 43 is selected in place of the output of a memory 42 in a dropout section. Therefore a code signal SB selected by the 3rd switch 48 is obtained in the form of an output having the compensated dropout. This output is decoded by a decoder 49 and then converted into an analog video signal, and this video signal is supplied to a video processing circuit 50. Thus a stealing video signal SO having the same form as an ordinary video signal is obtained. This can compensate assuredly the dropout which is due to a defective contact of a magnetic head H or other factors.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information signal recording device that does not use a photosensitive film and is suitable for use in so-called electronic cameras.

FIG. 1 shows the conceptual structure of an electronic still camera. Inside the camera housing (1), like a normal camera, there is a lens system (2), an iris mechanism (3), and a shutter mechanism (
4) A p (5), a 2-color (61* (7)), and a viewfinder (8) are provided.Also, parts unique to electronic cameras include a light sensor (9) such as a COD, and a signal recording brass reproducing circuit head. , a motor a1) for rotating the magnetic disk is provided.

The jacket α-hiro containing the rotating magnetic disk aa't is structured to be inserted into the main body from the outside of the camera housing (1). The magnetic disk Q3 has one disk drive for each trunk.
Still images are recorded concentrically. The reproduced image of this image is normal television reception 1fIkK.
However, the camera in this example is configured as an electronic camera with a playback function, so if the jacket A4 is set to playback mode with the electronic camera yK inserted, the output terminal - outputs an Eirin signal for still images, which is the same as a normal television signal.

By the way, since the jacket I that houses the magnetic disk α2 is constructed so that it can be inserted freely, if the jacket I is not properly inserted, the contact between the magnetic head H and the magnetic disk ri will not be constant, and the signal will be partially distorted. Record omissions (dropouts) may occur. Even when playing still I with the jacket A4 inserted in the electronic camera, if the jacket A4 is not properly inserted, playback may be missed. This can also occur when recording and playing back regular videos.

Therefore, the present invention has been devised so that a correct Eirin signal can be obtained even if a partial recording omission of the signal occurs. Next, a case in which an example of the present invention is applied to the above-mentioned electronic still camera will be described with reference to FIG. 2 and subsequent figures.

FIG. 2 shows an example of a device for recording an information signal, in this example, a still image signal, on a magnetic disk α2 and reproducing it from the magnetic disk α2. ) indicates the reproduction system.

1 iilimfi still video signal (information for 1 field or 1 field) output from 2 sensors (9)
8A (information for one frame) is encoded in the encoder 6υ, and the encoded code signal sB is written into a memory (register) having a field capacity or frame capacity provided as required. The code signal sB read from the memory wire is sent to the first switch □□□
, a recording amplifier, and a second switch (to) to a magnetic head H for recording and reproduction, and a code signal sB for a still image is recorded concentrically.

When recording the code signal SB on a concentric track KF,
Instead of recording one screen of information using the entire circumference of the Kl) rack as shown in FIG. 3, all the information for one screen is recorded, leaving the length of W33. This remaining magnetic track wB
Eirin information for the part where the dropout occurred is recorded.

Therefore, after recording the code signal sB for one screen,
By switching the second switch (g) as shown by the broken line, the code signal sB recorded just before is reproduced from the magnetic head H, and is supplied to the dropout detection circuit @ through the reproduction amplifier C37).

Meanwhile, in synchronization with this playback mode, a code signal with the same content as that recorded on the magnetic disk a3 (for convenience, 8BO) is read out again from the memory module, and this is supplied to the dropout detection circuit 1111 @, and is continuously output. A dropout of the reproduced code signal sB is detected based on the octopus code signal (original information signal) 8BO. In addition to the function of detecting a dropout, this detection circuit (to) also has a function of obtaining dropout detection position data and information data of the reference code signal 810 corresponding to the dropout location, that is, compensation data CD.

The position data is encoded by the subsequent encoder a9, and the coded position data AD and compensation data CD are temporarily stored in the memory Q (IK). Dropout detection etc. This is done on a screen-by-screen basis, and after detecting dropouts and performing other processing for one screen's worth of data, the first switch (to) is shown as a broken line, and the second switch (to) is shown as a solid line. Switched to rewrite sickle mode trap, position data AD and information data C
D are sequentially recorded in the remaining recording section WIK shown in FIG. 3 in the order shown in FIG. 4, for example.

The above signal processing is performed on one still image, and the still image code signal sB, position data AD, and compensation data CD are recorded on one circular magnetic track T.

Next, the signal recording/reproducing circuit Q (equipped with a reproducing system (reproducing processing circuit) (308) K will be explained.

The reproduction processing mode is a processing mode for obtaining a still image signal from the output terminal of the electronic camera, and the second switch (G) is switched as shown by the broken line to enter the reproduction mode. Regenerated code signal SB1 position data AD
and compensation data CD are supplied to the compensation circuit αDK via a reproducing amplifier G7).

As shown in the figure, this compensation circuit (4v) has a field or frame memory (4) for code signal Sl, a small capacity auxiliary memory (43) for storing compensation data CD, and an auxiliary memory for storing position data AD. is controlled by the output of (to the memory control circuit).

After all the data for one screen is stored, the data from the memory (c) and the data from the memory (transfer) are read out, and one of them is selected by the third switch. This third switch is controlled by a switching control signal 8sCt4η based on the position data ADK outputted from the memory.

That is, in the section where the dropout occurs, the & home control signal SsK [3rd switch - is switched as shown by the broken line, and in the dropout section, the output of the memory (43) is selected instead of the output of the memory (6). Therefore, the code signal sB selected by the third switch (411K) is obtained as an output whose dropout is compensated,
This is decoded in the decoder (c) and converted into an analog video signal, and this is sent to the video processing circuit 6.
1 to form a still video signal s□ having the same format as a normal video signal.

Since the present invention is constructed as described above, it is possible to reliably compensate for dropouts caused by poor contact of the magnetic head H.

In this case, since the present invention can compensate using exactly the same information as the information that caused the dropout, the deterioration in image quality is much greater than the conventional method of compensating using information from one horizontal line or one field before. Not at all.

In addition, in the above-mentioned embodiment, in order to apply the present invention to an electronic camera, the recording and playback functions were built into the electronic camera.
When the present invention is applied to an electronic camera having only a recording system (30A), a reproduction processing circuit (30B) may be provided in a dedicated reproduction device for magnetic disk α2. Applicable to magnetic recording and reproducing devices. The magnetic head H may not be used for both recording and reproduction, but may be configured as a head exclusively for recording and reproduction.

Furthermore, although the above description deals with still images, it is of course possible to use moving images as well, and in that case, it is necessary to obtain not only the clock for still images but also the clock for moving images from the clock generator Qe, as shown in Fig. 1. Control terminals (16a) and t (16b) for switching between a still clock and a moving picture clock may be provided, and the configuration may be such that these can be selected from the outside. The recording means may be optical or other means.

Compensation for dropouts is not limited to the case where the section where the dropout actually occurs is compensated by the original information signal.
All horizontal line information) may be compensated for.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main parts of an example of an electronic camera to which the present invention is applied, FIG. 2 is a system diagram of the main parts of an example of an electronic camera to which the invention is applied, and FIGS. FIG. 4 is a diagram for explaining the respective operations. Ql is a recording/reproducing processing circuit, (30A) is a recording system, (30
B) is the playback system, (to) is the dropout detection circuit, -1
) is a dropout compensation circuit, the fin is a magnetic disk, (9
) is a former dragon sir. Figure 1↑

Claims (1)

[Claims] The original information signal and the reproduced information signal are compared, and if there is an information area in the reproduced signal that differs from the original information signal, the original signal corresponding to that area is replaced with the area where the original information signal was recorded. An information signal recording device configured to record in a recording area different from that of the information signal recording device.