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JPH06233366

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH06233366
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
microphone device connected to a tape recorder or the like for recording.
[0002]
2. Description of the Related Art When recording a conversation such as a conference using a
recorder such as a tape recorder, the microphone device connected to the recorder via a cable is
brought close to a person in conversation, and the microphone device I try to pick up the voice of
the conversation. Alternatively, when using a microphone device with a relatively high directivity,
the microphone device is directed to the person in the conversation, even if the microphone
device is located at a distance from the person in the conversation, Good recording is possible.
[0003]
By the way, when recording in this form, it has been difficult to easily determine whether the
installation position of the microphone device is correct. That is, when recording in earnest in a
studio or the like, the test may be performed in advance to find the most appropriate position for
picking up a conversation, and the microphone device may be installed at this searched position.
It is troublesome to perform such tests in advance at a conference level. Therefore, the
installation position of the microphone device is determined by empirically judging the position
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which is considered to be the most commonly recorded.
[0004]
However, in such a case, it can not be determined from the microphone alone whether the
recording is correct or not, and even if it is not correctly recorded due to an incorrect position or
an incorrect usage, This is not known until the tape recorded later is played back.
[0005]
In order to prevent such a recording error, it is conceivable to connect an earphone etc. to the
monitor terminal of the recorder and simultaneously monitor the sound being recorded by the
recorder, but the monitor by such an earphone etc. There was a disadvantage that it took time
and effort.
[0006]
SUMMARY OF THE INVENTION In view of these points, the present invention aims to provide a
microphone device capable of reliably and easily capturing a target voice.
[0007]
SUMMARY OF THE INVENTION According to the present invention, as shown in FIG. 1, for
example, microphone units 1, 2a, 2b for converting changes in sound pressure into electrical
sound signals, and the microphone units 1, 2a, An amplifying circuit 12 for amplifying an audio
signal output by 2b, rectifying means 13 for rectifying the output of the amplifying circuit 12,
detecting means 15 to 19 for detecting an output level of the rectifying means 13, and detecting
means 15 to 15 The display means 30 in which the level display is performed according to the
detection level at 19 is integrally stored.
[0008]
In this case, a plurality of microphone units having different directivity are provided, and the
output levels of the plurality of microphone units are selectively displayed by the display means
30.
[0009]
Furthermore, in this case, at least three stages of display by bar graphs are performed as level
display on the display means 30 as shown in FIG.
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[0010]
According to the present invention, the sound collection state can be easily determined by
looking at the display state on the display means installed in the microphone device.
[0011]
In this case, it is possible to easily determine which directional microphone unit should be used
by selectively displaying the sound collecting states of a plurality of microphone units having
different directional characteristics.
[0012]
In addition, by displaying at least three levels in a bar graph as level display on the display
means, it is easy to determine, for example, the appropriate level, the excessive level, or the too
small level. Can do it.
[0013]
An embodiment of the present invention will be described below with reference to the
accompanying drawings.
[0014]
FIG. 1 is a diagram showing the configuration of the microphone device of this embodiment. In
this embodiment, an omnidirectional microphone and a sharp directivity microphone are
integrally housed. In FIG. 1, 1 is an omnidirectional microphone A unit is shown, 2a and 2b show
microphone units with a sharp directivity, and a process of converting a change in sound
pressure received by each of the microphone units 1, 2a and 2b into an electrical sound signal is
performed.
And two microphone units 2a and 2b of sharp directivity are used in combination, and
adjustment of directivity is performed.
An electret condenser type unit or the like is used as each of the microphone units, and for
example, as shown in FIG.
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That is, the omnidirectional microphone unit 1 is disposed at the end of the box-shaped first
casing 41, and the end of the second casing 42 rotatable relative to the first casing 41 is
provided. When the two microphone units 2a and 2b are disposed and sound is collected by the
acute directivity microphone units 2a and 2b, sound is generated by appropriately rotating the
second housing 42 as shown by a broken line. You can direct the range of sound collection in the
direction of
[0015]
Further, on the top surface of the first housing 41, a display panel 30, a microphone selection
switch 9, and an operation changeover switch 43, which will be described later, are disposed.
Furthermore, the signal line 44 is drawn out from the rear end of the first housing 41, and the
plug 45 at the end of the signal line 44 is inserted into the microphone terminal of the recording
machine (not shown), to the recording machine side. A collected audio signal is supplied.
[0016]
Referring back to FIG. 1, the circuit configuration in the microphone device will be described. In
order to combine the outputs of the two microphone units 2a and 2b, the output of one
microphone unit 2a and the output of the other microphone unit 2b Are inverted by the inverting
amplifier 3 and supplied to one end and the other end of the variable resistor 4 so as to be taken
out from the movable terminal of the variable resistor 4.
At this time, the directivity is adjusted by adjusting the position of the movable terminal of the
variable resistor 4.
Then, the audio signal extracted from the movable terminal of the variable resistor 4 is supplied
to the equalizer 5 to correct the frequency characteristic.
Then, the output of the equalizer 5 is supplied to the high pass filter 6 to cut low frequency
components.
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This low frequency component cut is performed to remove low frequency noise such as desk
vibration.
Then, the output of the high pass filter 6 is supplied to the microphone selection switch 9 side.
Further, the output of the omnidirectional microphone unit 1 is also supplied to the microphone
selection switch 9 side.
[0017]
In this case, in the vicinity of the microphone selection switch 9, a circuit for switching the
sensitivity of the microphone with a sharp directivity is formed. That is, the output of the
omnidirectional microphone unit 1 is supplied to the first fixed contact 9a of the switch 9, and
the combined output of the acute directivity microphone units 2a and 2b (that is, the output of
the high pass filter 6) is directly switched The second fixed contact 9b of 9 is supplied.
Furthermore, a circuit grounded via resistors 7 and 8 is connected to the output of high pass
filter 6, and the connection midpoint between resistor 7 and resistor 8 is connected to the third
fixed contact 9 c of switch 9. Connecting.
[0018]
By configuring the periphery of the microphone selection switch 9 in this manner, the movable
contact 9m of the switch 9 is connected to the first fixed contact 9a, so that the output of the
omnidirectional microphone unit 1 is from the microphone selection switch 9. The movable
contact 9m is connected to the second fixed contact 9b so that the outputs of the microphone
units 2a and 2b with sharp directivity are output from the microphone selection switch 9 with
high sensitivity, and the movable contact 9m is fixed to the third position. By connecting to the
contact point 9c, the outputs of the microphone units 2a and 2b of sharp directivity are
outputted from the microphone selection switch 9 with low sensitivity.
[0019]
Then, an audio signal obtained at the movable contact 9m of the microphone selection switch 9
is supplied to the output terminal 11 through the buffer amplifier 10, and the plug 45 at the tip
of the signal line 44 connected to the output terminal 11 (see FIG. 2) ) Provides an audio signal
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to the inserted recorder.
[0020]
In the present embodiment, an audio signal obtained at the movable contact 9m of the
microphone selection switch 9 is supplied to the amplification circuit 12 side, and amplification
for level detection is performed by the amplification circuit 12.
Then, the audio signal amplified by the amplifier circuit 12 is supplied to the rectifying diode 13
and rectified.
In this case, the cathode side of the diode 13 is grounded via the capacitor 14. Then, the signal
rectified by the rectifying diode 13 is supplied to the level discrimination circuit 19 via the
variable resistor 15. Further, the output of the variable resistor 15 is divided by a series circuit of
the resistors 16, 17, 18 to obtain a signal obtained at the connection midpoint of the resistors
16, 17 and a connection midpoint of the resistors 17, 18. To the level determination circuit 19.
[0021]
The level discrimination circuit 19 is constituted by a microcomputer, and discriminates the level
of the signal directly supplied from the variable resistor 15 side and the two types of divided
signals. Then, when the determined level is equal to or higher than the threshold value set for
each, a control signal for display is supplied to the display panel 30 via the drive circuit 20. Here,
the display panel 30 is configured of a liquid crystal display, and display is performed as shown
in FIG. The display state shown in FIG. 3 indicates that all displayable items are displayed, and
the display of bars 31, 32, and 33 different in height by three with the operation state display
such as ON and dead battery mark is displayed. The three-stage sound collection level (the level
of the output sound signal) is displayed by a bar graph using the three bars 31, 32, and 33. For
example, assuming that three sound pickup levels to be determined are V1, V2, and V3 (where
V1 <V2 <V3), when the lowest level V1 is exceeded, only the rod 31 having the lowest height is
displayed, When the level V2 exceeds the next level, the bars 32 and 31 of the second height are
displayed, and when the level V3 is exceeded, all bars 31, 32 and 33 are displayed.
[0022]
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Here, as the output sound level V1 for displaying only the lowest bar 31, the output sound level
for displaying up to the bar 32 of the second height is set to an excessively small sound
collecting level where it is difficult to determine the contents of conversation. Set as an
appropriate sound collection level as V2 and set as an excessive sound collection level near the
maximum output level of this microphone device as an output sound level V3 for displaying all
the bars 31, 32, and 33 . These settings are performed by adjusting the variable resistor 15 or
the like.
[0023]
Although not shown, the microphone device has a built-in battery, and power is supplied to each
circuit from the battery.
[0024]
According to the microphone device of this example configured as described above, the output
level of the sound picked up by the microphone unit in use is displayed on the display panel 30,
and becomes an indicator of the sound collection state.
That is, for example, when using microphone units 2a and 2b of sharp directivity with high
sensitivity by microphone selection switch 9 (ie, when movable contact 9m is connected to
second fixed contact 9b), the level discrimination circuit When it is detected at 19 that the output
level is excessive, on the display panel 30, all the bars 31, 32, and 33 are continuously displayed.
At this time, it is possible that the user of this microphone changes the installation position of the
microphone device or operates the microphone selection switch 9 to switch the microphone units
2a and 2b of sharp directivity to low sensitivity. . Alternatively, the microphone unit 1 may be
switched to the omnidirectional microphone unit 1.
[0025]
Conversely, when the level determination circuit 19 detects that the output level is too low, and
the display panel 30 is in a state where only the rod 31 is occasionally displayed, the microphone
installation position is brought close to a person talking Or, it is conceivable to switch the use
condition of the microphone to one with higher sensitivity or directivity.
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[0026]
As described above, only by confirming that the sound collection level of the sound is the
appropriate level on the display panel 30, an appropriate sound collection can be performed, and
a recording error due to the cause on the microphone side can be prevented.
And in the case of this example, since the level display is directly performed by the microphone
device, when deciding the installation position and use condition (selection of sensitivity and
directivity etc.) of the microphone, the appropriate position or condition is only on the
microphone side. If there is no need to check the display of the recorder connected via the signal
line 44 or if the recorder is at a distance from the microphone device or if the recorder monitors
the recording monitor Useful when it is difficult to do.
[0027]
In the above embodiment, two sets of microphone units having different directivity are switched,
but the present invention can be applied to a microphone apparatus having only a single
microphone unit. Alternatively, the present invention can also be applied to a microphone device
having two sets of microphone units having the same directivity, and performing stereo sound
collection in which the sound collection directions of the respective microphone units are
changed. In the case of the microphone device that performs this stereo sound collection, there
may be considered a case where the sound collection levels of the respective channels are
individually displayed and a case where the sound collection levels of the respective channels are
mixed and displayed.
[0028]
In the above-described embodiment, the liquid crystal display panel is used to perform level
display with three bar graphs, but other display modes may be used. However, it is not necessary
to display the level in detail, because it is sufficient if it is an indicator of the sound collection
state.
[0029]
According to the present invention, it is possible to easily determine the sound collection state by
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looking at the display state on the display means installed in the microphone device, and
connecting an earphone or the like to the recorder for recording monitoring Also, it can be easily
determined that proper sound collection is performed, and recording errors due to the
microphone can be prevented.
[0030]
In this case, by selectively displaying the sound collecting states of a plurality of microphone
units having different directivity, it is possible to easily determine which directional microphone
unit should be used, and it is easy to select an appropriate microphone. You can
[0031]
In addition, at least three stages of display by bar graphs are performed as the level display by
the display means. For example, at least three stages of determination of the appropriate output
level, the excessive output level, and the insufficient output level are minimum. It can be easily
done with the display of the limit.
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