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JPH03135300

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DESCRIPTION JPH03135300
[0001]
FIELD OF THE INVENTION The present invention relates to a camera integrated video tape
recorder (hereinafter referred to as "camera integrated" / TR). 2. Related Art In recent years,
camera-integrated VTRs have become widespread rapidly, and with the progress of high image
quality, there is an increasing demand for improvement against wind noise when recording on a
windy day outdoors regarding the sound quality. It is coming. Hereinafter, an example of the
above-described conventional camera integrated VTR will be described with reference to the
drawings. FIG. 3 is a block diagram of an input portion of an audio circuit of a conventional
camera integrated VTR. In FIG. 3, 1 is a built-in microphone, 6 is a low cut circuit for dropping
low frequency components of the signal from the built-in microphone 1, 7 is a low cut switch, 4
is a microphone amplifier circuit for amplifying an audio signal, and 5 is a recording The signal
terminal is connected to the recording circuit. The operation of the conventional cameraintegrated VTR configured as described above will be described below. First, since the external
sound is picked up by the built-in microphone 1 and the low cut changeover switch 7 is turned
off and used on a day without wind, the low cut circuit 6 does not operate and is amplified by the
microphone amplifier circuit 4 as it is. Also, since the low cut changeover switch 7 is turned on
and used on a windy day, the low cut circuit 6 operates, drops low frequency components, lowers
wind noise and makes the microphone amplifier circuit 4 amplify it. Ru. The audio signal
amplified by the microphone amplifier circuit 4 is input to the recording circuit through the
recording signal terminal 6. SUMMARY OF THE INVENTION However, in the configuration as
described above, as shown in FIG. 4 (FIG. 4 is a frequency characteristic diagram of the audio
signal 61. 62 in FIG. 3. ) Even when the low cut circuit is operating (audio signal e2), the middle
and high frequency gain does not change, so on a windy day, loud noise is recorded, and the
sound as soon as it is recorded, especially in the middle and high frequency The sound is so small
that it is difficult to hear it. In addition, if the low-cut cutoff frequency is increased too much, the
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1
sound quality may change. In view of the above problems, the present invention is a camera
which adds a circuit for increasing the gain of middle and high frequencies and combines it with
a low-cut circuit to make it possible to clearly and clearly record a sound desired to be recorded
on a windy day. It provides a physical VTR. Means for Solving the Problem In order to solve the
above problems, the camera integrated VTR according to the present invention has a low cut and
gain up circuit, a low cut, and a low cut that lowers the frequency characteristic of the low band
and increases the mid and high band gains. The present invention has the configuration
described above, which includes a gain-up changeover switch and operates the low-cut and gainup circuit by means of a low-cut and gain-up changeover switch. By turning on the change-over
switch, the low frequency characteristics are lowered, the middle and high frequency gains are
increased, wind noise is reduced, and the sound to be recorded can be recorded more clearly.
Become.
Embodiment A camera-integrated VTR according to an embodiment of the present invention will
be described with reference to the drawings. FIG. 1 is a block diagram of an input portion of an
audio circuit of a camera integrated VTR according to an embodiment of the present invention. In
FIG. 1, 1 is a built-in microphone, 2 is a low-cut and gain-up circuit that lowers low frequency
components of the signal from the built-in microphone 1 and amplifies middle and high band
gain, 3 is low cut and gain up switching A switch 4 is a microphone amplifier circuit for
amplifying an audio signal, and a recording signal terminal 5 is connected to the recording
circuit. FIG. 2 shows a frequency characteristic diagram of the audio signal 21.22 in FIG. The
operation of the camera integrated VTR configured as described above will be described below
with reference to FIGS. 1 and 2. First, the external sound is picked up by the built-in microphone
1 and the low cut and gain up changeover switch 3 is turned off when there is no wind, so the
low cut and gain up circuit 2 does not operate and is amplified by the microphone amplifier
circuit 4 as it is Be done. That is, the audio signal is amplified by the microphone amplifier circuit
4 with the frequency characteristic shown by 21 in FIG. Also, since the low cut and gain up
selector switch 3 is turned on when the 1st strength is strong, the low cut and gain up circuit 2
operates to drop low frequency components and increase middle and high gain. The noise is
reduced by the wind noise, and the sound to be recorded is made larger and amplified by the
microphone amplifier circuit 4. That is, the audio signal has the frequency characteristic and gain
shown in FIG. 2 at 22 and is amplified by the microphone amplifier circuit 4. The audio signal
amplified by the microphone amplifier circuit 4 is input to the recording circuit through the
recording signal terminal 5. As described above, according to the present embodiment, by
providing a low cut and gain up switching switch and a low cuff operating thereby and a gain up
circuit used on a windy day, wind noise is reduced and sound recording is reduced. You can
record the sound you want more clearly and clearly. Effects of the Invention As described above,
according to the present invention, it is possible to obtain excellent effects that wind noise can be
reduced on a windy day and sound to be recorded can be recorded more clearly and clearly. .
08-05-2019
2
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of an audio signal input portion of a camera integrated VTR according
to an embodiment of the present invention, FIG. 2 is a frequency characteristic diagram of audio
signals before and after the low cut and gain up circuit of FIG. FIG. 4 is a block diagram of an
audio signal input portion of a conventional camera integrated type VTR, and FIG. 4 is a
frequency characteristic diagram of audio signals before and after the low cut circuit of FIG.
1 ииииии Built-in microphone, 2 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и microphone switch .... Recording signal terminal.
08-05-2019
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