JPS63181576A - electronic still camera - 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] [Industrial application field] The present invention relates to an electronic still camera.

[Prior Art] Conventionally, a field recording magnetic head or a frame recording magnetic head has been used as a recording magnetic head for an electronic still camera. An electronic still camera equipped with this magnetic head for field recording can record one field of video signal on one track on a video floppy disk using one magnetic head, while a magnetic head for frame recording can record one field of video signal on one track on a video floppy disk. This electronic still camera uses two magnetic heads to capture two images on a video floppy disk.
Each track can record l fields of video signals, ie l frames of video signals. Therefore, an electronic still camera equipped with a magnetic head for frame recording has the advantage of being able to perform frame recording with higher resolution than an electronic still camera equipped with a magnetic head for field recording.

[Interlayer points that the invention aims to solve]However, in electronic cameras equipped with frame recording magnetic heads, two magnetic heads are placed close to each other, so crosstalk between the two magnetic heads is difficult to solve. In order to reduce the problem, it is necessary to use an expensive thin film head, and the contact area between the two magnetic heads and the video floppy disk is larger than in the case of one magnetic head. There was a problem in that it was difficult to adjust the video floppy disk so that it came into uniform contact with the video floppy disk.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide an electronic still camera that can record one frame of video signal onto a magnetic recording medium such as a video floppy disk using a single magnetic head. .

[Means for Solving the Problems] The present invention provides imaging camera means for converting images into television signals, storage means for storing the television signals, and one magnetic recording medium for recording the television signals on a magnetic recording medium. a head, a first switching means for outputting a television signal output from the imaging camera means to the storage means, and a second switching means for outputting the television signal output from the imaging camera means to the magnetic head. and third switching means for outputting the television signal output from the storage means to the magnetic head.

[Function] With the above configuration, for example, at a first time, the first switching means outputs the first field television signal output from the imaging camera means to the storage means, The television signal of the first field is stored in the storage means. Then, at a second time after the first time, the second switching means outputs the second field television signal outputted from the imaging camera means to the magnetic head, and the second field television signal is outputted from the imaging camera means. television signals are recorded on the magnetic recording medium via the magnetic head. Further, at a third time after the second time, the third switching means outputs the first field TV signal output from the storage means to the magnetic head, and the third switching means outputs the first field TV signal to the magnetic head. A television signal is recorded on the magnetic recording medium via the magnetic head. Therefore, one frame of television signals in the first field and the second field is recorded on the magnetic recording medium using one magnetic head.

[Embodiment] FIG. 1 is a block diagram of an electronic still camera which is an embodiment of the present invention. In this electronic still camera, the video signal of the first field is stored in a dynamic random access memory (hereinafter referred to as DRAM). ), the video signal of the second field is recorded on the video floppy disk. , and further record on the track D.
By reading the first field of the video signal from the RAM and recording it on the second track of the video floppy disk, it is possible to record one frame of the video signal on the video floppy disk using one magnetic head. It is a feature.

First, the configuration and operation of the recording circuit of the electronic still camera shown in FIG. 1 will be explained.

In FIG. 1, reference numeral 1 denotes a CCD image sensor composed of a charge coupled device (hereinafter referred to as COD), and the CCDCD image sensor includes a recording control circuit 16 to be described later.
In response to a first control signal manually inputted from the camera, an image incident through a photographic lens (not shown) is converted into an electrical signal and output to the matrix circuit 2 . Matrix circuit 2
converts the input electric signal into the luminance signal Y and color difference signal (R
-Y) and (B-Y), the luminance signal Y is output to the recording luminance signal processing circuit 3, and the color difference signal (R-Y
) and (B-Y) are output to the orthogonal two-phase modulation circuit 4. The orthogonal two-phase modulation circuit 4 performs orthogonal two-phase modulation on a carrier wave having a predetermined low frequency conversion frequency manually inputted from the oscillator 5 using color difference signals (R-Y) and (B-Y) to generate a low frequency conversion color signal. It is generated and output to the recording color signal processing circuit 6. The low frequency converted color signal is subjected to a known predetermined process for recording the color signal on a video floppy disk in a recording color signal processing circuit 6, and then outputted to an adder 7. On the other hand, the recording luminance signal processing circuit 3 performs predetermined processing such as PM modulation on the luminance signal and outputs an FM luminance signal to the adder 7. This FM luminance signal and the low frequency conversion color signal are added in the adder 7,
The generated NTSC color television signal (hereinafter referred to as a video signal) is passed through a buffer amplifier 8 to a switch 8a.
output to the common side. The a side of the switch 8a is an analog-to-digital conversion (hereinafter referred to as A/D conversion) circuit 9.
On the other hand, the b side of the switch 8a is connected to the b side of the switch 8b. The FM luminance signal and the low frequency conversion color signal are inputted to the A/D conversion circuit 9 via the a side of the switch 8a, and after being A/D converted at a predetermined sampling frequency, the DRAMIO having a storage capacity of 1 MB is input. is output to. The DRAMIQ stores the digital recording video signal input from the A/D conversion circuit 9 in response to a write command input from the memory control circuit 11, and stores the digital recording video signal input from the A/D conversion circuit 9 in response to a read command input from the memory control circuit 11. The stored digitally recorded video signal is read out and output to a digital-to-analog conversion (hereinafter referred to as D/A conversion) circuit 12.

The D/A conversion circuit 12 D/A converts the input digital recording video signal and outputs it to the magnetic head 15 via the a side of the switch 8b, the recording amplifier 13, and the REC side of the recording/reproducing switch 14a.

Note that the switches 8a and 8b are switched to the a side or the b side in conjunction with a control signal output from the recording control circuit 16. Recording/playback switch I4a, 14b and 1
4c is interlocked and switched to the RFC (recording) side or the PB (playback) side.

Ground is connected to the recording control circuit 16 via a shutter button 17 . At time 1+, press button 17
Or the earth signal is turned on and the recording control circuit! 6, and in response, the recording control circuit 16 sends the first control signal to the CCD image sensor element memory control circuit 11 and the switch 8.
a and 8b, and also outputs the first control signal to the head control mechanism 20 via the REC side of the switch 14b, and further outputs the first control signal to the control signal input terminal of the switch 14c. It is output to the motor control circuit 18 via the REC side. In response to this first control signal, the CCD image sensor 1 starts an imaging operation, and the switch 8a
and 8b is switched to the a side, and the memory control circuit 11 outputs a write command to DRAMIO. Further, in response to this first control signal, the head control mechanism 20 moves the magnetic head 15 to a predetermined recording track (hereinafter referred to as the first track) on the video floppy disk, and the motor control circuit 18 is the spindle motor 19
Rotate. At this time, the first
The video signal of the field is A/D converted and stored in the DRAM.
Written to IO.

Next, 1/60 second (approximately 16.7 milliseconds) from time 1+
At a later time t, the recording control circuit 16 outputs the second control signal to each control signal input terminal of the switches 8a and 8b. In response to this second control signal, switch 8
a and 8b are switched to the b side. At this time, the second field video signal output from the adder 7 is recorded on the first track of the video floppy disk via the magnetic head 15.

Furthermore, l/60 seconds (approximately 16.7 milliseconds) from time t.
Later, at time t3, the recording control circuit 16 outputs a third control signal to the head control mechanism 20. In response to this third control signal, the head control mechanism 20 moves the magnetic head 15 from the first track to the next second track.

Further, at time t, approximately 2 (H seconds) after time t3, the recording control circuit !6 outputs the fourth control signal to each control signal input terminal of the switches 8a and 8b, and to the memory control circuit 11. .In response to this fourth control signal,
The switches 8a and 8b are switched to the a side, and the memory control circuit 11 outputs a read command to the DRAMIO. At this time, the first field digital video signal stored in DRAMIO is read out and transferred to DRAMIO.
/A conversion and then recorded on the second track of the video floppy disk via the magnetic head 15.

Finally, at time t, 1/60 seconds (approximately 16.7 milliseconds) after time t4, the recording control circuit I6 outputs the fifth control signal to the motor control circuit 18, and in response, the motor The control circuit 18 stops the spindle motor I9,
The recording operation of the video signal of 1 frame consisting of the first and second fields is completed.

Next, the configuration of the reproducing circuit of the electronic still camera shown in FIG. 1 and the operation of reproducing the video signal recorded on the video floppy disk will be explained.

During playback, the upper recording/re-switching switches 14a, 14b, and 14c are switched to the PB side.

The video signal recorded on the video floppy disk is reproduced using the magnetic head 15, and the reproduced video signal is outputted via the PB side of the recording/reproduction switch 14a and the reproduction amplifier 21 to the common side of the switch 22a. switch 2
The a side of the switch 2a is connected to the input terminal of the A/D conversion circuit 23, while the b side of the switch 22a is connected to the b side of the switch 22b. In the A/D conversion circuit 23, after the reproduced video signal is A/D converted at a predetermined sampling frequency, 1
The data is output to the DRAM 24 having a storage capacity of M bytes. The DRAM 24 stores the digital playback video signal input from the A/D conversion circuit 23 in response to a write command input from the memory control circuit 25, and stores the digital reproduction video signal input from the A/D conversion circuit 23 in response to a read command input from the memory control circuit 25. The stored digital reproduction video signal is read out and output to the D/A conversion circuit 26. The D/A conversion circuit 26 converts the input digital playback video signal into a D/A, and converts it into a bypass filter (hereinafter referred to as HPF) 28 and a low-pass filter (hereinafter referred to as HPF) via the switch 22bLy)a side and the buffer amplifier 27. , called LPF.

)29.

The HPF 28 extracts only the FM luminance signal from the input reproduced video signal and outputs it to the reproduced luminance signal processing circuit 30.
The FM luminance signal is output to the adder 32 after being subjected to predetermined processing such as FM demodulation.

The LPF 29 extracts only the low-frequency converted signal from the input reproduced video signal and outputs it to the reproduced color signal processing circuit 31, and the low-frequency converted color signal undergoes a predetermined process such as high-frequency conversion to a color subcarrier frequency of 3.58 MHz. After the processing is performed, it is output to the adder 32. The adder 32 adds the input luminance signal and color signal and outputs the result to the video output terminal 33 as a video signal.

A ground is connected to the playback control circuit 34 via a playback button 35 . At time t11 when the playback button 35 is turned on and the ground signal is manually input to the playback control circuit 16, the playback control circuit 34 sends the eleventh control signal to the memory control circuit 2.
5. output to each control signal input terminal of the switches 22a and 22b, and also output the eleventh control signal to the head control mechanism 20 via the PB side of the switch 14b;
Further, the eleventh control signal is output to the motor control circuit 18 via the PB side of the switch 14c. In response to this eleventh control signal, the switches 22a and 22b are switched to the a side, and the memory control circuit 11 transfers the write command to the DR.
Output to AM24. In addition, in response to this eleventh control signal, the head control mechanism 20 moves the magnetic head 15 to a predetermined recording track (in this case, the first track) on the video floppy disk, and the motor control circuit 18 moves the magnetic head 15 to the spindle. Rotate the motor 19.

At this time, the second field video signal reproduced by the magnetic head 15 is A/D converted and written to the DRAM 24.

Next, at time t1f, 1/60 second (approximately 16.7 milliseconds) after time t11, the reproduction control circuit 34
2 control signals are output to the head control mechanism 20. In response to this twelfth control signal, the head control mechanism 20 moves the magnetic head 15 to the second recording track.

Further, at time t'3, approximately 20 milliseconds after time t12, the reproduction control circuit 34 outputs the thirteenth control signal to each control signal input terminal of the switches 22a and 22b, thereby causing the switches 22a and 22b to can be switched to the side. At this time, the first field video signal reproduced by the magnetic head 15 is transmitted to the reproduction amplifier 21. switch 2
The signal is outputted to the reproduced luminance signal processing circuit 30 and the reproduced color signal processing circuit 31 via the b side of the switch 22b, the b side of the switch 22b, the buffer amplifier 27, and the HPF 28 or LPF 29, and is converted into a first field NTSC color television signal. and output to the video output terminal 33.

Furthermore, at time j+a, 1/60 second (approximately 16.7 milliseconds) after time j+3, the reproduction control circuit 34 transmits the fourteenth control signal to each control signal input terminal of the switches 22a and 22b, and to the memory control circuit. Output to 25. In response to this fourteenth control signal, switches 22a and 2
2b is switched to the a side, and the memory control circuit 25 outputs a read command to the DRAM 24. At this time, after the digital video signal of the second field stored in the DRAM 24 is read out and D/A converted, the reproduced luminance signal is processed via the a side of the switch 22b, the buffer amplifier 27, and the HPF 28 or LPP 29. It is output to the circuit 30 and the reproduced color signal processing circuit 3I, and the second
field is converted into an NTSC color television signal and output to the video output terminal 33.

Finally, l/60 seconds (approximately 16.7 milliseconds) at time t14
At a later time LI5, the regeneration control circuit 34 outputs a fifteenth control signal to the motor control circuit I8, and in response, the motor control circuit 18 stops the spindle motor 19 and outputs a fifteenth control signal from the first and second fields. The operation of reproducing the video signal of the 1 frame is completed.

As explained above, since one frame of video signal can be recorded and played back on a video floppy disk using one magnetic head, the resolution is higher than that of conventional electronic still cameras equipped with field recording magnetic heads. It is possible to record and play back images with high quality. Another advantage is that there is no need to provide a frame recording magnetic head, which is expensive and whose position is difficult to adjust, unlike conventional electronic still cameras equipped with a frame recording magnetic head.

[Effects of the Invention] As detailed above, according to the present invention, there are provided an imaging camera means for converting an image into a television signal, a storage means for storing the television signal, and a device for recording the television signal on a magnetic recording medium. a first switching means for outputting a television signal output from the imaging camera means to the storage means; and a second switching means for outputting a television signal output from the imaging camera means to the magnetic head. a switching means;
and a third switching means for outputting the television signal outputted from the storage means to the magnetic head, so that, for example, one magnetic head can be used to transfer the television signal of one frame of the first field and the second field. The present invention has the advantage that it is possible to record on the above-mentioned magnetic recording medium, and there is no need to use a frame recording magnetic head having two magnetic heads, which is expensive and difficult to adjust.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electronic still camera which is an embodiment of the present invention. ■...CCD image sensor, 2...Matrix circuit, 3...Recording luminance signal processing circuit, 4...Orthogonal two-phase modulation circuit, 6...Recording color signal processing circuit, 7...Addition 8a, 8b...Switch, 9...Analog-to-digital conversion circuit (A/D conversion circuit), 10...Dynamic random access memory (D
RAM), 11... Memory control circuit, I2... Digital-to-analog conversion circuit (D/A conversion circuit), I5... Magnetic head, 16... Recording control circuit, 18... Motor control Circuit, 19... Spindle motor, 20... Head control mechanism.

Claims (1)

[Claims] (1) Imaging camera means for converting video into a television signal; storage means for storing the television signal; one magnetic head for recording the television signal on a magnetic recording medium; output from the imaging camera means; a first switching means for outputting the television signal to the storage means; a second switching means for outputting the television signal output from the imaging camera means to the magnetic head; and a second switching means for outputting the television signal output from the storage means. An electronic still camera comprising: third switching means for outputting to the magnetic head.