JPS6133080A - Video camera - Google Patents

Abstract

PURPOSE:To attain a correct stereo sound recording by switching simultaneously a directional acoustic signal and vertical and horizontal scan signals of a viewfinder according to loaded posture of an electronic viewfinder to a camera main body. CONSTITUTION:An electronic viewfinder 2 is loaded with inversion between the right or left eyepiece use, for example, according to the choice of a photographer. In such a case, a changeover switch operation button 25 is operated manually to switch a changeover switch 7. As a result, the polarities of vertical and horizontal scan signals are switched based on the finder 2. At the same time, the R and L side acoustic signals S1 and S2 are extracted with exchange given between right and left positions and recorded. Therefore the picture on a CRT3 of the finder 2 are inverted vertically. Furthermore the directivity of a stereo microphone 4 can also be inverted between right and left directions. This attains the correct stereo sound recording.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a video camera in which an electronic viewfinder with a stereo microphone integrally attached thereto is detachably attached to the video camera body. This invention relates to improvements in output signal extraction means.

[Prior art]

A conventional video camera of this type has a configuration as shown in FIG. In the figure, reference numeral 1 denotes a video camera body, and an electronic viewfinder 2 is removably attached to the top surface of this body 1. The electronic viewfinder 2 is attached with a cathode ray tube 3 for monitoring. Further, a stereo microphone 4 integrated into a single rod is integrally attached to one side of the electronic viewfinder 2.

Note that a camera lens 5 is provided on the front of the video camera body 1.
is attached to the main body 1, and a grip portion 6 is provided at the lower front portion of the right side surface of the main body 1.

The electronic viewfinder 2 can of course be attached to the video camera body 1 in a state suitable for the right eyepiece as shown in FIG. 8(a), as shown in FIG. 8(b), depending on the photographer's preference. It can also be attached to the left eyepiece as shown. However, in this case, the vertical relationship of the image projected on the cathode ray tube 3 is reversed from that when the electronic viewfinder 2 is installed for the right eye, so normally the image is reversed vertically using an image changeover switch (not shown). It becomes.

By the way, when the electronic viewfinder 2 is mounted with the left and right sides reversed as described above, the left and right directivity of the stereo microphone 4 is naturally also reversed. Even if this situation occurs, there is no particular problem since it is not normally required that the screen captured by the video camera and the direction of the audio input match so strictly, and the device can be used as is in the above state. This is the reality. However, in cases where a train is being photographed and a horn is being recorded at the same time, a strange feeling will be produced if the movement of the subject and the direction of the sound input do not match.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to provide a video camera that can perform correct stereo recording even when the electronic viewfinder is attached to the video camera body in a horizontally reversed manner.

〔overview〕

In order to achieve the above object, the present invention is characterized by the following configuration. That is, a pair of directional acoustic signals supplied to a recording device from a stereo microphone integrally attached to the electronic viewfinder and vertical and horizontal synchronization signals of the viewfinder are transmitted to the camera body according to the mounting posture of the electronic viewfinder relative to the video camera body. The feature is that the switches are simultaneously switched depending on the situation.

(Embodiment) Fig. 1 is a block diagram showing a first embodiment as the most desirable embodiment of the present invention.The same parts as in Fig. 7 are given the same reference numerals.Electronic viewfinder 2 The stereo microphone 4 integrally attached to the R side (
Right side) microphone 41 and L side (left side) microphone 4
2, each outputting acoustic signals 81 and 82 having independent directivity. The R side sound green signal S1 output from the R side microphone 41 is sent to the electronic viewfinder 2.
The signal is input to the R side sound output circuit 81 through the normally closed side of the changeover contact 71 of the changeover switch 7 provided at the side. The R-side sound green signal S1 processed by the R-side sound output circuit 81 is
The signal is supplied through the terminal 91 to a recording section (not shown) of a recording/reproducing device, which is made of a magnetic tape or a magnetic disk, built in or separately provided in the video camera body 1, and is recorded.

Similarly, the left side acoustic signal S2 outputted from the L side microphone 42 is inputted to the L side sound output circuit 82 via the normally closed side of the changeover contact 72 of the changeover switch 7, and after signal processing, passes through the terminal 91 to the L side sound output circuit 82. The signal is supplied to the recording section of the recording/playback device and recorded.

On the other hand, the image captured by the camera lens 5 of the video camera body 1 is converted into an electrical signal by the imaging circuit A and output as a video signal S3. The image pickup circuit A is composed of an image pickup device 11 made of, for example, a COD solid-state image pickup device, which operates based on a synchronization signal given from a synchronization signal generation circuit 10, and a video processor 12, and an electric signal outputted from the image pickup device 11. The video processor 12 converts the signal into a video signal, such as an N or TSC color video signal, and sends it out. The video signal S3 is supplied to the recording/reproducing apparatus from the terminal 93 via the recording/reproducing switch 13, which is turned ON during recording and OFF during reproduction, and is recorded. The video signal S3 is also supplied to a synchronization separation circuit 14 of an electronic viewfinder driver B provided in the video camera body 1, and the separation circuit 14 separates and extracts the synchronization signal. The separated and extracted synchronization signal is sent to the horizontal oscillation circuit 15 and the vertical oscillation circuit 16.
supplied to The horizontal oscillation circuit 15 generates a sawtooth wave for horizontal scanning based on the applied horizontal synchronizing signal, and supplies this to the horizontal output circuit 17.

The horizontal output circuit 17 outputs a horizontal deflection output S4 according to the sawtooth wave applied from the horizontal oscillation circuit 15. The vertical oscillation circuit 16 generates a sawtooth wave for vertical scanning based on the applied vertical synchronization signal, and supplies this to the vertical output circuit 18. The vertical output circuit 18 outputs a vertical deflection output 85.86 according to the sawtooth wave applied from the vertical oscillation circuit 16.

The video signal S3 is sent to the electronic viewfinder driver B.
The video signal is also supplied to the video signal amplification circuit 19 in -○-, where it is amplified to a predetermined level video signal, and then
It is output as a monitor video signal S7.

The horizontal deflection output S4 is supplied to the horizontal deflection coil 21 of the cathode ray tube 3 in the electronic viewfinder 2 via the normally closed side of the changeover contact 73 and the normally closed side of the changeover contact 74 of the changeover switch 7. Also, the vertical deflection output 85.8
6 is supplied to the vertical deflection coil 22 of the cathode ray tube 3 via the respective normally closed sides of the changeover contacts 75 and 76 of the changeover switch 7. The monitor video signal S7 is converted into a signal of a required level by the video drive circuit 23 and is applied to the grid of the electron gun in the cathode ray tube 3.

Note that the output of the horizontal output circuit 17 is converted into a high voltage by a high voltage circuit 24 and applied to the anode of the cathode ray tube 3.

In this way, the captured image of the subject is displayed on the cathode ray tube 3. Note that when reproducing a video signal recorded on the recording/reproducing device, the recorded image is displayed on the cathode ray tube 3 in the same manner as described above.

On the other hand, when the electronic viewfinder 2 is inverted and attached, for example, from the right eyepiece to the left eyepiece according to the photographer's preference, the changeover switch 7 is changed over by manually operating the changeover switch operation button 25. Then, each of the switching contacts 71 to 76 is simultaneously switched to the normally closed side. As a result, the R side sound blue signal S1 is the normally open side of the switching contact 72, and the L side sound output circuit 82. The L side acoustic signal S2 is recorded on the recording/reproducing device via the terminal 92, and the L side acoustic signal S2 is connected to the normally open side of the switching contact 71, the R side.
Sidetone sound output circuit 81. The data is recorded on the recording/reproducing device via the terminal 91.

On the other hand, the horizontal deflection output S4 output from the horizontal output circuit 17 of the electronic viewfinder driver B is
4 and the normally open side of the horizontal deflection coil 21 degree switching contact 73, it is supplied to the horizontal deflection coil 21 with a polarity opposite to that in the above case. At the same time, the vertical deflection output S5. which is also output from the vertical output circuit 18. S6 is supplied to the vertical deflection coil 22 via the normally open side of the switching contacts 76, 75 with the opposite polarity as in the previous case. Therefore, the horizontal and vertical scanning directions are completely reversed from the previous case, and the subject image is projected on the cathode ray tube surface with the vertical relationship reversed, that is, in a normal state.

In this way, in this embodiment, by switching the changeover switch 7, the vertical and
At the same time as the polarity of each horizontal scanning signal is switched, the R side tone blue signal S1 and the L side sound signal S2 are taken out and recorded with the left and right sides reversed, so that the image on the cathode ray tube 3 of the electronic viewfinder 2 is The directivity of the stereo microphone 4 can be reversed horizontally and vertically, and correct stereo recording can be performed.

Next, another embodiment of the present invention will be described. FIG. 2 is a block diagram showing a second embodiment as another embodiment of the present invention. In this embodiment, a matrix type stereo microphone 4x is used as the stereo microphone. The R side microphone 41 outputs the R sidetone green signal S1, and the L side microphone 42 outputs the 1st sidetone preborrow signal S2. The signal S1 is added to the signal S2 in the adder 43, and the signal S2 is added to the signal S2.
-0- is subtracted from the signal S1 in the subtracter 44. The adder 43 outputs a sum signal 843 (L+R) of the signals S1 and S2. The above signal 843 (L + R) is the R side tone tube amplifier 8
Supplied to 1X. The subtracter 44 outputs a subtracted signal 844 (LR) between the signal S2 and Sl. The above signal S44
．． (L-R) are switching contacts 72 of switch 7 on the one hand;
On the other hand, the polarity is inverted by the polarity reversing circuit 45 to become a signal 845 (R-L), and then applied to the normally open terminal of the switching contact 72.

Signal 872 selectively obtained at the common terminal of switching contact 72
is supplied to the L side acoustic amplifier 82X.

The subtracter 83 subtracts the output 582X (LR or RL) of the amplifier 82X from the output 581X of the amplifier 81X. Also, the output 582X of the amplifier 82X is converted into the output 581X (L + R) of the amplifier 81X in the adder 84.
is added.

When the switching contact 72 of the switch 7 selects the normally closed terminal Q, the subtracter 83 outputs a signal 883 corresponding to 2R, and the adder 84 outputs a signal S84 corresponding to 2L. When the switching contact 72 selects the normally open terminal, the subtracter 83 outputs a signal 883 corresponding to 2L.
The adder 84 outputs a signal S84 corresponding to 2R. These signals 883 and 884 are output to output terminal 9.
1.92 to a recording/reproducing device (not shown),
recorded.

The video signal S3 from the video processor 12 is applied on one side to the normally closed terminal e of the switching contact 73 of the switch 7, and on the other hand, after its vertical relationship is reversed by the video up/down reversing circuit 50, the video signal S3 is applied to the normally closed terminal e of the switching contact 73 of the switch 7. It is given to the normally open side terminal f. The signal obtained at the common terminal of the switching contact 73 is supplied to the cathode ray tube 3.

According to the second embodiment configured as described above, the signal 58
By appropriately changing the 2X amplitude and/or phase, various stereo efficiencies can be obtained. moreover(
Since the signal 843 (L+R) containing the information of L+R) does not pass through the switch 7, even if the switching contact 72 of the switch 7
Even if a contact failure occurs, (L+R) monaural recording will be performed. Therefore, it is possible to avoid complete recording errors due to poor contact. In other respects, the same effects as in the first embodiment are achieved.

3 to 5(a) and 5(b) are diagrams showing a third embodiment of the present invention. In this embodiment, the changeover switch operation button 2
In this example, a knob that is automatically operated when the electronic viewfinder 2 is attached to the video camera body 1 is used instead of the knob 5. That is, in FIG. 3, reference numeral 60 is a mounting member provided on the mounting surface of the electronic viewfinder 2, and a changeover switch driving knob 61 protrudes from the projecting end surface thereof so as to be freely retractable. Reference numeral 62 designates an electronic viewfinder support member provided at the finder mounting portion of the video camera body 1, and one end surface thereof is provided with a recess 63 into which the drive knob 61 can be fitted.

FIG. 4 is a sectional view showing a state in which the mount member 60 is coupled to the support member 62. As is clear from this figure, the mount member 60 has an H-shaped cross section, and the support member 62 has a substantially C-shaped cross section so as to slidably engage with the H-shaped mount member 60. .

In this embodiment configured as described above, when the electronic viewfinder 2 is attached to the video camera body 1 for the right eyepiece, the changeover switch driving knob 61 is moved to the support member 62 as shown in FIG. 5(a). It is in a state where it is fitted into the recess 63 of. Therefore, in this case, the changeover switch 7 does not perform a switching operation, and each switching contact is held on the normally closed side. Contrary to the above, when the electronic viewfinder 2 is attached to the video camera body 1 for the left eyepiece, the changeover switch drive knob 61 is pushed in at one end surface of the support member 62, as shown in FIG. 5(b). The state will be as follows. Therefore, in this case, the changeover switch 7 operates and each changeover contact is switched to the normally open side. Therefore, the horizontal positional relationship of the pair of directional audio signals and the vertical positional relationship of the video signal are reversed from those for the right eye eyepiece.

As described above, in this embodiment, when the mounting posture of the electronic viewfinder 2 with respect to the video camera body 1 is changed,
Accordingly, the horizontal positional relationship of the pair of directional sound signals and the vertical positional relationship of the video signal are automatically switched, which greatly simplifies the operation.

FIGS. 6(a) and 6(b) are front views showing main parts of a fourth embodiment of the present invention. What is shown in Figures 6(a) and (b) is
A right microphone 41 and a left microphone 42 are independently attached to both left and right sides of the electronic viewfinder 2. When the microphones 41 and 42 installed in this manner are used, the directivity characteristics of the microphones are more clearly exhibited, so that the effects of the present invention are even more remarkable.

〔Effect of the invention〕

According to the present invention, when an electronic viewfinder is attached to a video camera body in a horizontally inverted manner, a pair of directional acoustic signals are supplied from a stereo microphone to a recording device and Since the vertical and horizontal operation signals are switched at the same time, it is possible to provide a video camera capable of stereo recording with correct directivity even when the electronic viewfinder is attached to either the right eye eyepiece or left eye eyepiece position.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the circuit configuration of the first embodiment of the present invention, FIG. 2 is a block diagram showing the circuit configuration of the main part of the second embodiment of the present invention, and FIGS. 3 to 5 (a) and (b) are diagrams showing the main parts of a third embodiment of the present invention, FIG. The figure is a cross-sectional view of the above-mentioned joint, and FIGS. 5(a) and 5(b) are cross-sectional views showing the action of a changeover switch drive knob provided on the joint. Figure 6(a)(b)
) is a front view showing the configuration of the main parts of the fourth embodiment of the present invention, FIGS. 7 and 8 (a) and (b) are views showing a conventional video camera, and FIG. 7 is a perspective view. 8(a) is a front view showing the electronic viewfinder attached to the right eyepiece, and FIG. 8(b) is a front view showing the electronic viewfinder being attached to the left eyepiece. 1...Video camera body, 2...Electronic viewfinder, 3...Cathode ray tube, 4...Stereo microphone, 7...Selector switch.

Claims (1)

[Claims] In a video camera that includes a video camera body, an electronic viewfinder that can be attached to the video camera body in a horizontally reversible and removable manner, and a stereo microphone that is integrally attached to the electronic viewfinder, the stereo microphone A pair of directional acoustic signals supplied from the electronic viewfinder to the recording device and vertical and horizontal scanning signals of the viewfinder are simultaneously switched depending on the mounting posture of the electronic viewfinder with respect to the camera body. Video camera.