JPS5953604B2 - magnetic recording and reproducing device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a charge-coupled device (hereinafter simply referred to as a CCD).

) The present invention relates to a magnetic recording and reproducing device equipped with an imaging unit configured as follows. Traditionally, video tape recorders (hereinafter simply referred to as VTRs)
That's what it means.

) etc., one frame memory, -
By processing the reproduced signal using a signal processing device using a temporary storage means such as a field memory or a delay circuit having a delay time of the horizontal scanning period (hereinafter simply referred to as -H delay). It is known that functions such as noise removal, dropout compensation, aperture compensation, contour extraction, and time axis correction can be increased. However, since the various temporary storage means necessary for the above-mentioned signal processing devices are expensive, in reality, some high-end models for broadcasting stations etc.
The increased functionality of signal processing devices can only be put to practical use in TRs. By the way, in recent years, with the development of semiconductor technology, CCD (Charge Coupled Device)
A compact solid-state imaging device constructed using 8mm video cameras has been developed, and video cameras that can be easily used like 8mm cameras are being put into practical use.

It is known that the above CCD is a functional element that has both a self-scanning function and a memory function. SUMMARY OF THE INVENTION Accordingly, the present invention provides a magnetic recording/reproducing device including an imaging section configured with a charge-coupled device, in which a reproduction signal obtained during a reproduction operation is supplied to the charge-coupled device of the imaging section, and the charge-coupled device is used as temporary storage means. By configuring the playback signal to be used to perform signal processing on the playback signal, the charge-coupled device of the imaging section, which is not used during normal playback operation, can be effectively used as a temporary storage means to perform various signal processing on the playback signal. The present invention provides a magnetic recording and reproducing device that can be used in various applications.

That is, a first object of the present invention is to make it possible to reproduce images captured by an imaging section with extremely good image quality.

Another object is to increase various functions without providing a signal processing device for reproduced signals as an external device. Furthermore, another object is to make the entire image recording and reproducing system using a magnetic recording and reproducing device smaller in size and at a lower cost. The following two aspects of the present invention will be described in detail with reference to the drawings showing one embodiment.

First, FIG. 1 shows an external perspective view of an embodiment of a VTR according to the present invention.

In this embodiment, inside the 6VTR main body 1, there are an imaging section 2 block composed of a CCD, and . Although not shown, a recording and reproducing block for magnetically recording and reproducing video signals, a control circuit block for each block, and the like are built-in.

An imaging lens section 3 mounted on the VTR main body 1
The image light beam of the subject passes through the imaging unit 2 consisting of a CCD.
It is incident on . The imaging section 2 converts the image light beam into an electric signal as an imaged video signal, and records this imaged video signal on a magnetic tape using a magnetic recording block.

In FIG. 1, reference numeral 4 denotes a tape holder to which a tape cassette 5 containing the above-mentioned magnetic tape is mounted, and this tape holder 4 is disposed on a side wall portion of the VTR main body 1. Here, the imaging operation to obtain the above-mentioned imaging video signal and 6
The recording operation for recording the obtained captured video signal can be performed simultaneously by simply operating the operating lever 6 in conjunction with each other. By operating various operation buttons 7 arranged on the upper wall side end portion of the VTR main body 1, recording and reproducing operations can be performed independently without performing the above-mentioned imaging operation. In Fig. 1, 8A is a video signal input terminal used to record an external video signal, and 8B is a video signal input terminal used to record a video signal recorded on a magnetic tape. This is a video signal output terminal for output. Further, the above-mentioned imaging lens section 3 includes an automatic aperture adjustment section 1 to which a control signal according to the brightness of the subject is supplied via a cable 9.
0 is attached to its body 3A, and its diaphragm is automatically adjusted by the automatic diaphragm adjustment section 10 so that the optimal amount of light rays are always incident on the imaging section 6.

This makes it possible to always obtain an imaging video signal with an appropriate signal level for the above-mentioned imaging operation. Note that the automatic aperture adjustment unit 10 opens and adjusts the aperture of the imaging lens unit 3 only in the imaging operation state, and when the imaging operation is not performed, no light rays enter the imaging unit. Thus, the aperture of the imaging lens section 3 is operated to completely close it. A VTR equipped with the above-mentioned imaging function can be made small and lightweight by having an extremely small imaging unit 2 configured using a CCD perform the above-mentioned imaging function, as shown in FIG. As shown in FIG. 1, first and second handle portions 1A and 1B are provided on a VTR main body 1 and used as a portable VTR.

Next, in the VTR as mentioned above. The configuration of the main parts of an embodiment in which the CCD constituting the imaging unit 2 is used as a frame memory during playback operation to perform signal processing such as noise removal from the playback signal. is shown in the block diagram of Figure 2. That is, in FIG. 2, 12A is the light receiving part 12B which has the number of picture elements for the field.
is formed on the CCD, and 12C is formed on the CCD so as to be able to accumulate signal charges as many as the number of picture elements for the field.
A significant accumulation area portion 12E consisting of an accumulation portion 12D formed by
12F is a fat insertion section disposed between the imaging area section 12A and the accumulation area section 12C, and 12F is an output register section disposed on the terminal side of the accumulation area section 12C. A frame transfer type CCD imaging section 12 is configured.

Furthermore, in this embodiment, an input register 12G is provided on the starting end side of the imaging area section 12A of the imaging section 12. In such an imaging section 12, during the image capturing and recording operation of the VTR, an image beam of a subject is irradiated onto the imaging area section 12A through the imaging lens section 3, and the light receiving section 12B is
During the vertical blanking period, the photo-excited charges corresponding to the amount of light received during the field period are used as signal charges for one field, and the above charges are sequentially moved vertically downward (in the direction of the arrow Y in the figure) during the vertical blanking period. The signal charges of one line in the horizontal direction are transferred to each accumulation section 12D of the accumulation region section 12C, and the signal charges of one line in the horizontal direction are converted into an imaging signal of 1H in units of 1H. It operates to obtain and output an imaging signal from the image light beam by transferring and outputting it in the horizontal direction (direction of arrow X2 in the figure) from the output register section 12F.

In FIG. 2, reference numeral 11 denotes a transfer pulse generator that generates a vertical transfer pulse Fv and a horizontal transfer pulse FH for vertically and horizontally transferring signal charges in the imaging section 12. This transfer pulse generator 11 is
A vertical synchronization signal VD and a horizontal synchronization signal HD are supplied from the first and second input terminals 13A and 13B, and each transfer pulse Fv and FH are generated from each synchronization signal D and H, and the vertical transfer pulse Fv is supplied to the imaging area section 12A and the storage area section 12C, and the horizontal transfer pulse FH
is supplied to the input register section 12G and the output register section 12F. The imaging unit 12 configured to perform the imaging operation as described above has the automatic aperture adjustment unit 1 during the TR playback operation.
Since the aperture of the imaging lens section 3 is completely closed by the action of the 0, the signal charge corresponding to the field can be accumulated in the imaging region section 12A without generating photo-excited charges in the imaging region section 12A, and the image capturing is possible. Area section 12A and storage area section 1
2C can be used as a frame memory that stores signal charges for a frame. In FIG. 2, reference numeral 14 denotes a signal terminal to which a reproduction signal obtained by reproducing from the magnetic tape during the reproduction operation of the VTR is supplied, and the reproduction signal is transmitted to the imaging section 12 through this signal input terminal 14. input register section 12G and the first input terminal 15 of the adder 15
A is supplied to A.

Then, in the imaging section 12, the input register section 12G first transfers the signal charge for the above-mentioned reproduced code in the horizontal direction (direction of arrow X2 in the figure) Vc, and then transfers this signal charge to the from the input register section 12G in the vertical downward direction (direction of arrow Y in the figure),
A frame's worth of signal charges is repeatedly accumulated in the accumulation region 12C for each frame. In this way, the signals obtained by reading out the signal charges for one frame stored in the imaging section 12 by sequentially transferring them in the horizontal direction (direction of arrow X1 in the figure) in units of 1H in the output register section 12F are as described above. is supplied to the second input terminal 15B of the signal adder 15.

The adder 15 adds the -frame signal stored in the imaging unit 12 and the reproduced signal from the signal input terminal 14 for one frame next to this signal, and converts the output signal into a reproduced video signal. The video signal is output from the video signal output terminal 8B. An example of such a configuration can be shown in the equivalent block diagram of FIG. 3 in which the above-mentioned imaging section 12 is replaced by a frame memory 1Z.

In general, video signals have a frame correlation, whereas noise components in a video signal have no frame correlation. Therefore, in the embodiments described above, the signal level of the video signal in the reproduced signal is superimposed and the noise components are dispersed. Thus, a reproduced video signal with substantially less noise can be obtained.

The signal processing in such embodiments can be extremely effectively used to improve the S/N ratio when recording and reproducing one video signal repeatedly. Further, regarding an embodiment in which the above-mentioned VTR is configured to perform signal processing such as image contour extraction using the CCD constituting the imaging section 2 as a field memory during playback operation. , the configuration of its main parts is shown in the block diagram of FIG.

In FIG. 4, 22A is each light receiving section for odd fields, 22B is each light receiving section for even fields, 22C is each vertical transfer register section disposed vertically along each of the above light receiving sections 22A and 22B, and 22D is each light receiving section for even fields. is an input register section 22Y arranged on the starting end side of each vertical transfer register section 22C mentioned above.
f:, is an output register section disposed on the terminal side of each vertical transfer register section 22C, and each of these sections is connected to C.
It is formed from a CD, and constitutes an interline type CCD imaging section 22.

Such an imaging section 22 transmits photo-excited charges obtained according to the amount of light irradiated at each light receiving section 22A, 22BVC to each light receiving section 22A for each odd field during the imaging/recording operation of the VTR described above. Each transfer register section 22C
In addition, each even field is transferred from each light section 22B to each vertical transfer register section 22C, and the charge of each field is transferred to each vertical transfer register section 22C.
By sequentially transmitting the signal in the vertical downward direction (Y direction in the figure) through C and outputting one horizontal line as an imaging signal in units of 1H from the output register section 22E, an imaging signal can be obtained from the image beam. It performs imaging operations.

In addition, in FIG. 4, 21 is a transfer pulse generator, and this transfer pulse generator 21 generates signals from the vertical synchronization signal VD and horizontal synchronization signal HD supplied from the first and second signal input terminals 23A and 23B. Creating a vertical transfer pulse Fv and a horizontal transfer pulse FH and supplying the vertical transfer pulse Fv to the vertical transfer register section 22C,
The above horizontal transfer pulse is supplied to the input register section 22D and the output register section 22E. The imaging unit 22 configured as described above does not irradiate the light receiving units 22A and 22B with light during the playback operation of the VTR.
A reproduced signal is supplied from the signal input terminal 24 to the input register section 22D.

This imaging section 22 transfers the signal charge for the above-mentioned reproduced signal in the horizontal direction (in the direction of arrow Xl in the figure) to the above-mentioned input register section 22D, and further transfers the signal charge in units of 1H to the above-mentioned input register section 22D. The data is sequentially transferred to each vertical transfer register section 22C in the vertical direction (direction of arrow Y in the figure) via the vertical transfer register section 22C. Here, each of the above vertical transfer register sections 22C
is each light receiving section 22A or each light receiving section 22 during imaging operation.
Since it is capable of storing the charge equivalent to the field obtained in B, it can be used as a field memory during the playback operation of the VTR described above. The electric charges of one field stored in each of the above vertical register sections 22C are transferred in the horizontal direction (in the direction of arrow X2 in the figure) in the output register section 22E, with one horizontal line as a video symbol of 1H unit. Therefore, it is read out and supplied to the second input terminal 25B of the subtracter 25.

The subtracter 25 has a first input terminal 25A supplied with the reproduced signal from the input terminal 24, and uses a difference signal between the reproduced signal and the signal before the field as an image contour extraction signal. Output from signal output terminal 8B. An example of such a configuration can be shown in the equivalent block diagram of FIG. 5 in which the above-mentioned imaging section 22 is used as the field memory 27.

In the embodiment described above, the video signal output terminal 8A
For example, since the outline extraction function of the image can be obtained,
This can be used extremely effectively in cases where the locus of movement of an object is relimited and analyzed.

Furthermore, in the above-mentioned VTR, the CCD constituting the imaging section 2 is used as a -H delay unit during playback operation.
A block diagram of FIG. 6 shows the structure of an embodiment in which signal processing for compensating for dropout of the reproduced signal is performed.

In this embodiment, the imaging section 32 uses a frame transfer type or interline type CCD imaging section as described above. The output register section 32A of the imaging section 32 has its starting end connected to the movable terminal 31A and video signal output terminal 8B of the switch 31, and its terminal end connected to the first fixed terminal 31B of the switch 31. It is connected. The switch 31 has a second fixed terminal 31C connected to the frequency demodulator 33.
is connected to the output side of the
The connection switching operation between B and 31C and the movable terminal 31A is controlled by the detection output signal of the envelope detector 34. In addition, in FIG. 6, 35 is a magnetic head for reproduction, and
36 is a regenerative amplifier. In an embodiment having such a configuration, dropout compensation for a reproduced signal of a VTR can be performed in the following manner.

The imaging and recording operations in this example are as follows. Since it is similar to each of the above-mentioned embodiments, the explanation will be omitted. In this example,
During a playback operation, a detection signal obtained by tracing a magnetic tape (not shown) with a playback magnetic head 35 is frequency demodulated by a frequency demodulator 33 to obtain a playback signal, and an envelope detector 34 performs envelope detection. A dropout detection signal is obtained.

Then, the switch 31 is activated by the above dropout detection signal.
When the switching operation is performed and no dropout occurs, the playback signal is output as a video output signal to the video signal output terminal 8B via the second fixed terminal 31C and the movable terminal 31A of the switch 31. At the same time, the reproduced signals described above are sequentially accumulated in the output register section 32A of the image pickup section 32 as signal charges in units of -H. A horizontal transfer pulse FH from the transfer pulse generator 30 is supplied to this output register section 31A. Then, when a dropout occurs and the detection output level of the envelope detector 34 decreases, the 6 switch 31 switches so that its movable terminal 31A is electrically connected to the first fixed terminal 31B, and the above-mentioned output register section 32A The signal charge accumulated 1H before is outputted from the video signal output terminal 8B as a reproduced video signal. Note that if dropout occurs continuously over several H periods, the previous signal charge is repeatedly accumulated in the output register section 32A, and the same reproduced video signal is repeatedly output. Output from signal output terminal 8B. That is, in this embodiment, by using the output register section 32A for outputting the imaging signal in units of 1H from the imaging section 32 during the imaging operation as a 1H delay unit during the reproducing operation, dropout compensation of the reproduced signal can be achieved. By doing so, you can always obtain reproduced images of good quality.

Furthermore, regarding an embodiment of the VTR as described above, during playback operation, the CCD constituting the imaging section 2 is used as a variable delay line to perform signal processing for correcting jitter and suppressing noise. Its configuration is shown in the block diagram of FIG.

In this embodiment as well, only the reproduction operation will be explained. That is, in the embodiment shown in FIG.
is a frame transfer type or interline type CCD imaging unit as described above, and its input register unit 4
2A is used as a variable delay line for jitter correction, and its output register section 42B is used as a -H delay line for noise suppression.

Then, the detection signal from the reproduction magnetic head 45 is amplified by the reproduction amplifier 46, and the reproduction signal obtained by further frequency demodulating by the frequency demodulator 43 is supplied to the input register section 42A of the imaging section 42. There is.

This input register section 42A horizontally transfers the signal charge for the above-mentioned reproduced signal according to the first horizontal transfer pulse FHl generated by the first transfer pulse generator 48 from the oscillation output signal from the voltage controlled oscillator 47. Direction (arrow X1 in the figure)
direction). Here, the horizontal synchronization signal in the above-mentioned reproduced signal is separated by the synchronization separator 49, and the signal component in this horizontal synchronization separated signal is detected by the signal detector 50. The signal is supplied to the voltage controlled oscillator 47 as a signal. The jitter component of the signal obtained through the input register section 42A whose transfer operation is controlled by the first horizontal transfer pulse FHl obtained from the oscillation output signal FHl of the voltage-controlled oscillator 47 as described above is corrected. It becomes what is given.

The reproduced signal that has been subjected to jitter correction processing in this way via the input register section 42A as a variable delay line for jitter correction is further supplied to the output register section 42B, and is also supplied to the signal adder 40. 1st input terminal 40A
supplied to

The output register section 42B is output in the horizontal direction (in the direction of arrow X2 in the figure) according to the horizontal transfer pulse FH2 generated by the second horizontal transfer pulse generator 41 from the reference horizontal synchronizer number.
Transferring the signal charge for the reproduction signal to the reproduction signal adder 40 is performed, and the reproduction signal is delayed by 1H to the reproduction signal adder 40.
is supplied to the second input terminal 40B of. Then, in the above-mentioned signal adder 40, the output signal of the addition of the playback signal whose jitter has been corrected as described above and the signal obtained by delaying this playback signal by 1H via the above-mentioned output register section 42B is added to the video signal. The output signal is output from the video signal output terminal 8A. In this embodiment, the above output register section 4
By using 2B as a 1H delay, the noise component of the video signal can be suppressed by utilizing the vertical correlation of the video signal. As is clear from the description of each embodiment as described above, according to the present invention, the CCD constituting the image pickup section, which is not used during normal playback operation, can be used as a storage means, and various signal processing can be performed on the playback signal. Therefore, a reproduced video signal with good image quality can be obtained, and functions can be increased through the various signal processing described above, and a magnetic recording and reproducing apparatus with a wide range of applications can be provided.

Furthermore, since the present invention does not require a signal processing device that conventionally needed to be provided as an external device, the entire imaging/reproducing system using the magnetic recording/reproducing device can be made smaller and less expensive.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of an embodiment of a magnetic recording/reproducing apparatus according to the present invention. FIG. 2 is a block diagram showing an embodiment of the frame number processing circuit using the imaging section in the above embodiment as a frame memory, and FIG. 3 is an equivalent block diagram thereof. Fourth
This figure is a block diagram showing an embodiment of a signal processing circuit using the imaging section in the embodiment shown in FIG. 1 as a field memory, and FIG. 5 is an equivalent block diagram thereof. FIGS. 6 and 7 are block diagrams showing respective embodiments of signal processing circuits in which the imaging section in the embodiment shown in FIG. 1 is used as a 1H delay unit. 1...
...VTR body, 2, 12, 22, 32, 42...
... CCD imaging section, 3... Imaging lens section,
4... Force set holder, 5... Table cassette, 6... Imaging operation lever, 7...
...Record/playback operation button, 8A...Video signal input terminal, 8B...Video signal output terminal, 1
0...Mocking aperture adjustment section. 11, 21, 30, 41
, 48...Transfer pulse generator, 12A...
...imaging area section, 12C...accumulation area section, 12
G, 22D, 42A...Output register section, 12
F, 22E, 32A, 42B... Input register section, 14, 24... Signal input terminal, 15, 40
...Signal adder, 25...Signal subtractor, 31...Switch, 33,43...
Frequency demodulator, 34...Envelope detector, 35,
45...Magnetic head for reproduction, 36.46...
... Regenerative amplifier, 47 ... Voltage controlled oscillator, 49 ... Synchronous separator, 50 ... Jitter detector.

Claims (1)

[Scope of Claims] 1. In a magnetic recording/reproducing device including an imaging section configured with a charge-coupled device, a reproduction signal obtained during a reproduction operation is supplied to the charge-coupled device of the imaging section, and the charge-coupled device is stored in temporary storage means. 1. A magnetic recording and reproducing apparatus characterized in that the magnetic recording and reproducing apparatus is configured to perform signal processing of the reproduced signal by using the apparatus as a magnetic recording apparatus. 2. A one-frame memory is formed by the charge-coupled device of the imaging section, and the adding means adds the reproduced signal obtained during the reproduction operation and the signal obtained from the reproduced signal via the one-frame memory. The magnetic recording and reproducing apparatus according to claim 1, characterized in that: 3 A one-field memory is formed by the charge-coupled device of the imaging section, and a difference signal between a reproduced signal obtained during reproduction and a signal obtained by passing this reproduced signal through the one-field memory is outputted from the subtracting means. The magnetic recording and reproducing apparatus according to claim 1, characterized in that it is configured as follows. 4 A delay circuit having a delay time of one horizontal scanning period is formed using a charge-coupled device of the imaging section, and a switching means is used to connect a reproduction signal obtained during a reproduction operation and a signal obtained from the reproduction signal through the delay circuit. 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the magnetic recording and reproducing apparatus is configured to selectively output data through a magnetic recording medium.