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DESCRIPTION JPH02280580

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DESCRIPTION JPH02280580
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
video camera apparatus suitable for collecting sound at the time of imaging. SUMMARY OF THE
INVENTION The present invention relates to a video camera apparatus suitable for collecting
sound at the time of image pickup, a camera head unit having an image pickup means and a
microphone, and a camera connected to the camera head unit by a cable and controlling the
camera head unit. In a video camera apparatus provided with a control unit, the camera head
unit has microphone gain control means for controlling the output signal of the microphone to
an arbitrary level and transmitting it to the camera control unit, and gain control for the
microphone gain control means By providing the camera control unit with microphone gain
adjustment means for transmitting signals through the cable, it is possible to obtain a video
camera device capable of reducing the noise of the cable and increasing the dynamic range when
transmitting the output signal from the microphone did Than is. 2. Description of the Related Art
A video camera apparatus for a studio or a relay car has conventionally been configured as
shown in FIG. In FIG. 2, (1) is a camera head unit (hereinafter referred to as CHU), which is a
video camera main body composed of a solid-state imaging device such as a CCD and a head
amplifier and a lens (4) of an imaging optical system. Furthermore, in this CHU (1), a viewfinder
(2), a microphone (3) for collecting sound at the time of ti image, and a headphone and a
microphone worn by a camera operator (6) on the head etc. Including a headset (5). A video
signal (8) such as the luminance signal Y (8a) and the color difference signal U / V (8b) is output
from the output of such C) 1 tJ (1), and via the coaxial cable (7) It is transmitted to a camera
control unit (hereinafter referred to as CCU) (9) provided on the studio or relay vehicle (10) side.
A video signal (8) imaged by such a video camera is, for example, frequency-modulated and
transmitted by a coaxial cable (7). The CCU (9) creates data for control and adjustment. The
studio or relay vehicle (10) has a control panel (11) that performs signal processing related to
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video and an audio mixing console (12) that performs mixing of audio signals, etc. Etc.) adjust the
image pick-up signal and the sound collection signal of CHU (1) while looking at the monitor
receiver (17), audio level meter etc., the video signal (15) and audio signal (16) It becomes John
signal and is aired.
In the allocation of FIG. 3 in addition to the luminance signal (8a) and the color difference signal
(8b) of the video signal (8) on the coaxial cable (7) connecting the above C) I U (1) and the CCU
(9) As shown, data (19), return video signal (22), first microphone signal (2OL), second
microphone signal (2OR), ink cam signal (21), power supply voltage such as AC 240 V, etc. Is
transmitted. Here, as for the return video signal (22), an image pickup signal picked up on the
CHLJ (1) side is passed through the CCU (9), and an image adjusted and received by the monitor
receiver (17) on the control panel (11) is put again on the CHU (1) side. The video signal is
transmitted from the CCU (9) side to the CHtJ (1) side via the coaxial cable (7) as can be seen in
the device identifier (2). Also, for example, the left and right audio signals collected from the DC
or AC power supply voltage, for example, AC 240 V (18) or the microphone (3) used in the CHU
(1) side circuit are the first and second microphone output signals (20 L) It is transmitted as
(20R). The ink cam signal (21) is used for technical or program communication between the
camera operator (6) operating the CHU (1) and the video or audio mixer (14), and the data (19) is
CCU (9) This is control data for performing white balance adjustment and aperture automatic
control etc. on the CHU (1) side from the side, and these signals are frequency division
multiplexed so that bidirectional transmission is possible. FIG. 4 is a system diagram showing an
audio level adjustment method in the case where a conventional output signal such as voice from
a microphone (3) as described above is transmitted from the CHIJ (1) side to the CCU (9) side. In
the figure, the first or second microphone output signal (20L) or (20R) such as left and right
audio signals collected by the microphone (3) is input to the input terminal (23). The micron
output signal (20L) or (20R) is passed through the preamplifier (24), for example, frequencymodulated by the modulation circuit (25), transmitted to the CCU (9) through the coaxial cable
(7), and 9) The demodulation circuit (26) on the side forms the original first or second analog
microphone output signal (20L) or (2OR) and is supplied to the variable gain amplification circuit
(27) where it is gain controlled It is supplied to an audio mixing console (12) or the like in the
studio (10), adjusted to a predetermined level, and turned on air. In addition, as another
adjustment method, an audio gain adjustment means for manual adjustment is provided on the
CHtJ (1) side, and the mixer (14) on the CCU (9) side is a headset (13) via the ink cam signal (21).
The gain level instruction is given, and the camera operator (6) manually operates the abovementioned audio gain adjustment means based on the instruction of the mixer and sets it to a
predetermined level.
[Problems to be Solved by the Invention] According to the above-described conventional
configuration of the television camera apparatus, the first or second microphone output signal
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(20L) or (20R) is always collected at a constant level on the CHU (1) side. The gain is adjusted by
the variable gain control amplifier circuit (27) on the CCU (9) side via the coaxial cable (7), and
supplied from the output terminal (28) to the audio mixing console (12) side. When collecting
surrounding voice etc. with the microphone (3), the voice level fluctuates largely according to the
environment, but the level of the sound at the time of this voice collection is usually around -60
dB (2, 2aVPP), but this voice When a signal etc. is transmitted through a coaxial cable, there is a
predetermined noise level determined by the coaxial cable (TRIAX) (7), so the S / N with the
noise level determined by the coaxial cable (7) when the sound collection level decreases. Is
worse. On the other hand, since the dynamic range transmittable by the coaxial cable (7) is about
20 dB, there is a problem that the transmission level is suppressed to about 20 dB even if the
microphone level becomes large. SUMMARY OF THE INVENTION The present invention was
made to solve the problem of overhead, and an object of the present invention is to obtain a
video camera device which can use the characteristics of the coaxial cable (7)-in a manner similar
to that described above. . [Means for Solving the Problems] A video camera apparatus according
to the present invention is a camera head unit provided with an imaging means (4) and a
microphone (3) as an example of which is shown in FIGS. 1 and 2. In a video camera apparatus
comprising a camera control unit (9) connected to (1) and a camera head unit (1) and a cable (7)
and controlling the camera head unit (1), a microphone (3) The microphone gain control means
(27L) (27R) is provided in the camera head unit (1) to control the output signal of the camera to
an arbitrary level and transmit it to the camera control unit (9) through the cable (11).
Microphone gain adjustment means (44L) (44R) for transmitting gain control signals to control
means (27L) (27R) Is obtained by the way to achieve the solution of problems by causing
provided in the roll unit (9). [Operation] According to the video camera apparatus of the present
invention, the microphone level adjustment means (44L) (44R) provided on the CCU (9) side is
provided on the CHU (1) side via the coaxial cable (7) by adjusting Since the gain and level of the
output signal of the microphone can be adjusted, gain control can be performed according to the
characteristics of the coaxial cable (7).
An embodiment of a video camera apparatus according to the present invention will be described
below with reference to FIG. The same reference numerals as in FIGS. 2 and 4 denote the same
parts in FIG. In FIG. 1, the case where the output signal of the microphone (3) is, for example, two
channels on the left and right will be described. In FIG. 1, the first microphone output signal
(2OL) (2OR) is collected from the left and right microphones (3) at (23L) and (23R), and a
variable gain control amplifier circuit provided in the CHU (1) (27L) is supplied to (27R). The
output of the variable gain control amplifier circuit (27L) (27R) is, for example, AM or FM
modulated by the modulation circuit (25L) (25R) as in FIG. 4 and provided on the CCtJ (9) side
through the coaxial cable (7). The signal is demodulated by the demodulator circuit (26L) (26R)
and output to the output terminals (28L) (28R) through the amplifier circuits (29L) (29R) to be
supplied to the audio mixing console (12). In the present invention, the microphone level
adjustment circuit (44L) (44R) supplies an analog direct current or digital signal of about 3 to 4
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bits through the input terminals (45L) (45R) connected to the audio mixing console (12). After
adjusting to a predetermined level, the signal is supplied to a parallel-serial conversion circuit
(hereinafter referred to as P / S) (42) to convert a parallel signal (or data) into a serial signal (or
data). This conversion is performed by a microcomputer (hereinafter referred to as a CPU) (43)
provided on the CCU (9) side. The data (or signal) formed in series with P / S (, 12) is, for
example, the CHU (1) side through the coaxial cable (7) in the form as described in the data (19)
of FIG. The signal is supplied to a serial-to-parallel conversion circuit (hereinafter referred to as S
/ P) (40) and converted to a parallel signal or data by S / P (40). This conversion is performed by
the CPU (41) provided on the CH [1 (1) side] (or parallel signal) is supplied to the gain control
circuit (30L) (30R), and this gain control circuit (30L) (30R) The gain of the variable gain control
circuit (27L) is varied at the output of In this variable range, the microphone output signal is
actually varied by about 60 dB to -40 dB, so the first and second microphone output signals
(2OL) (2OR) are connected to the coaxial cable (7) from the CCU (9) side. Can be remotely
controlled through In this case, since the audio mixer (14) can perform gain adjustment on the
CHU (1) side in accordance with the characteristics of the coaxial cable (7), the microphone
output signal etc. is too large to be suppressed in the coaxial cable or It is possible to provide a
video camera device that is not too small to degrade the S / N.
Although the variable gain amplification circuits (27L) and (27R) are provided on the CHU (1)
side in the above embodiment, the gain is continuously varied, but the variable gain may be
varied by switching the tap, Of course, various modifications can be made without departing
from the scope of the present invention. The appropriate distortion free microphone output
signal corresponding to the change of.
[0002]
Brief description of the drawings
[0003]
1 is a system diagram showing an embodiment of a video camera apparatus according to the
present invention, FIG. 2 is a conceptual diagram for explaining a conventional television camera
system, FIG. 3 is an allocation diagram of conventional transmission signals, and FIG. It is a
systematic diagram which shows the conventional audio | voice level adjustment method.
(27L) (27R) is a variable gain control amplification circuit, (30L) (30R) is a gain control circuit,
(44L) (44R) is a microphone knowledge adjustment circuit.
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