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JPS5014430

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DESCRIPTION JPS5014430
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A and 1B are respectively a side view in an
omnidirectional state and a unidirectionality state of an embodiment of a condenser microphone
to which a characteristic switching device according to the present invention is applied, FIG. Is a
characteristic curve diagram of the condenser microphone of the present invention device, and
FIG. 3 is an electric circuit of one specific embodiment in the case where the characteristic
compensation of the microphone is switched by the input circuit of the recording recorder of the
tape recorder. FIG. 4 is an electric circuit diagram of a specific embodiment in the case where the
switching of the characteristic compensation of the microphone is performed by the output
circuit of the recording amplifier of the tape recorder. 1.......・ Gold sound amplifier, I ..... Binson
head% C1 to C4 ..... ... capacitor, Rl "R4. ""resistance. Fig. 1 (B)-63, Fig. 1 50-14430 (2) Fig. 2 once
a week Nokaki Fig. 3 Fig. 4 j Fig. 16 j 7 C 4 R 4 single self-directed self-susceptibility [----y 'l " 4
one beat
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a condenser
microphone of a condenser microphone, and a condenser microphone for switching directivity by
opening and closing an opening through which sound pressure enters and exits behind a
diaphragm by a mounting body. An object of the present invention is to provide a device capable
of simultaneously switching the sensitivity and frequency characteristics of a condenser
microphone by utilizing the displacement at the time of directivity switching of the condenser
microphone. (1) In general, it is extremely convenient to switch the directivity for use of the
microphone, but due to the structure of the microphone in volume homogeneity, the microphone
directivity, frequency characteristics, timbre, etc. may change in six directivity. In this type of
variable directivity microphone, it is desired that the sensitivity, frequency characteristics, timbre,
etc. of the microphone does not change even if the directivity is switched. 0 Conventionally, in
the system in which the directivity of the microphone is switched by an acoustic circuit As the
changeover switch is provided on the body of the microphone, and in the system in which the
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directivity of the microphone is electrically mixed, the directional switch and the mounting
position of the directivity are changed by the structure of the microphone such that the
changeover switch is provided on the power supply unit. Also, as variable directivity
microphones, they are often used for sieve grade microphones such as condenser type and
ribbon type, and any field Also it becomes structurally large and also costly, as a result, has not
been realized as a built-in equipment such as a tape recorder. The present invention utilizes the
"Contin (2) directivity switching device of samik" (JP 47-77450, JP 47-77452) previously
proposed by the present person, and its capacitor microphone The switch for switching the
characteristics of the microphone can be easily switched by the displacement at the time of
directivity switching, and FIGS. 1 (4) and (2) described with reference to the embodiment thereof
are not very large. The side view in the non-directional equivalent state of the 1 Example of the
capacitor ¦ condenser microphone which applied the custom-made switching device to be
considered, and a unidirectionality state is shown. In each figure, 1 is a condenser microphone,
for example, incorporated in the chassis 2 of the tape recorder so as to be able to be inserted and
removed via the mounting body 3 and provided on the surface line in the state of FIG. Since the
opening (not shown) for letting in and out pressure pressure to the back of the diaphragm (not
shown) is made by the mounting body 3, the sound pressure F2 to the opening is cut off. The
diaphragm vibrates only by the wedge ratio F applied to the front (2) without being transmitted
to the rear surface of the description moving plate, and the non-directionality of supplying this
US can be obtained. In the state shown in FIG. 0, the sound pressure F is applied from the front
surface of the diaphragm and the sound pressure F2 is the above. It is transmitted to the back of
the diaphragm through the opening, and since there is a phase difference between the sound
pressure F and F 2 due to the difference in the path, it is configured to obtain the abovementioned directivity-directivity. There is.
4 is an interlock switch, and in the non-homologous state not shown in the same figure of the
microphone l, the protrusion 4a 'which is contained in the contact piece 4aK is pushed by the
rear of the microphone 1 to close the contact 4b and the contact nl- In the ratio-directivity state
of the cam microphone l shown in the same figure 0, the contact piece 4a is configured in such a
manner that the pushing movement by the removal portion of the microphone l is released and
closed with the intention 4C. Describe. Now, when the frequency one dimension of the condenser
microphone 1 having the above configuration is determined, the frontality in the non-directional
state of the microphone l changes as shown in the second curve, and -10,000 microphones l
single directivity The positive conictability at the time changes as in FIG. As is clear from the
figure, the same wave number characteristics of (l) particularly in the low frequency band are
significantly different between l when the microphone l is non-directed and when it is singledirected, so that each directivity of the microphone l When switched and used, a significant
difference in sensitivity occurs in sound quality. Next, although the characteristic compensation
of the condenser microphone 1 is performed and the compensation method differs depending on
which of the characteristic curves A and B are aligned in FIG. 2, the case where the characteristic
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curve A approaches BK will be described for convenience. FIG. 3 shows an electric circuit
diagram of a concrete example when switching of characteristic compensation of the microphone
1 is performed by, for example, an input circuit of a recording amplifier of a tape recorder. In the
figure, the same reference numerals are given to the same components as those shown in FIG.
When the output signal of the condenser microphone l is supplied to the recording amplifier via
the delay 1 switch 4 and the external microphone input jack 5, the microphone l is switched to
the nest-directivity state shown in FIG. The output signal of the microphone l is the recording
amplifier 6 via the interlock switch 4, the capacitor C1, the resistor R1 and the external ←
portion microphone shuck 5 etc. in which the μ-contact 4a described above is closed at the
origin 4C. You will be paid for the rate. At this time, if the low frequency time constant of the
above circuit determined by the capacitor C1, the resistor vLR, and (5) the resistor R6 is set
sufficiently large, the output signal of the microphone l has its frequency characteristics as the
capacitor C1, the resistor R1 and The characteristic music piece # 1B shown in FIG. 2 is supplied
to the recording amplifier 6 without being affected by the resistance 穐. Next, when the
microphone l is switched to the non-directional state in FIG. 1, the output signal of the
microphone l is interlocked such that the above 4 ports <the contact piece 4a is closed to the
contact 4b. The signal is supplied to the recording amplifier 6 via the switch 4, the capacitor C2,
the resistor R2, the external microphone input jack 5, and the like. At this time, if the low-pass
time constant of the above circuit determined by the capacitor C2, the resistor R2 and the
resistor bird is set relatively small, the output 18 of the microphone l has its frequency
characteristics as the capacitor C2, the resistor FL2 and the resistor 穐. Under the influence of
the characteristic curve in FIG. 2, the characteristic curve 1d of the characteristic curve C is
regarded as a signal of the characteristic curve C and is supplied to the recording amplifier 6.
The valley characteristic is compensated by the above-mentioned signal path to become the
characteristic curves B and C shown in FIG. 2 (6), and as a result, the sensitivity difference of the
sound quality is reduced.
FIG. 4 is an electric circuit diagram of a specific embodiment when switching of characteristic
compensation of the microphone 1 is performed by, for example, an output circuit of a recording
amplifier of a tape recorder-that is, a so-called constant current tol path supplying a signal to a
recording head). Indicates In the figure, the same reference numerals are given to the same
components as the valley shown in FIG. The output signal of the capacitor l is supplied to the
recording head 7 via the recording amplifier 6 and the constant current circuit resistor R4. Now,
when the microphone l is switched to the single directivity state shown in FIG. 1, the output 1
signal of the microphone l is closed at the contact 4c of the recording amplifier 6 and the upper
contact 4a of its own. The interlock switch 4 (that is, the capacitor C4 is short-circuited by the
switch 4) is supplied to the recording head 7 via the resistor R4. Accordingly, the microphone l)
output signal is supplied to the recording head '7 VC as it is with the characteristic curve B
shown in FIG. 2 without supporting the influence of the seven frequency characteristic all
capacitors C4 and the resistor R4. (7) Next, when the microphone l is switched to the
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nondirectional state shown in FIG. 1 (d), the output signal of the microphone l is the recording
amplifier 6, the capacitor C4 (ie, the interlock switch 4 is not As described above, the contact
piece 4a is switched to the contact 4b and the switch 4 is opened), and supplied to the recording
head 7 via the resistor R4. At this time, if the low-pass time constant of the path is determined by
the capacitor 04 and the resistance R4 as in the embodiment shown in FIG. 3, the output signal
of the microphone l is Under the influence of the capacitor C4 and the resistor R4, the frequency
characteristic is changed from the state shown by the characteristic curve mA in FIG. 2 to the
state shown by the characteristic curve C and supplied to the recording head 7, thus the
capacitor microphone 6 characteristics at the time of switching l are compensated by the abovementioned ker <signal path to become シ B C of the characteristic curves B, C shown in FIG. In
the above embodiment, although the microphone 1 is inserted into and removed from the
mounting body 3 and the continuous switch 4 is switched, the microphone 1 is rotated 8) relative
to the hooked body 3 to rotate it. The interlock switch 4 is configured to be switched by
displacement, and Characteristics may be in the manner to compensate for in the like. As
described above, the characteristic switching apparatus FL of the capacitor microphone which is
the + invention is attached to the capacitor microphone whose directivity is switched by opening
and closing the opening for allowing sound pressure to enter and leave behind the diaphragm by
the mounting body. The characteristic of the microphone by using the fli- at the time of
directivity switching of the condenser microphone, switching of the switch to perform J
switching, so that the non-uniformity and the single (with a simple configuration) It is possible to
perform switching of the characteristics at the time of i′′1 at the same time as switching
between the finger and the finger with the eye, and the condenser microphone itself can be
reduced to seven, and sometimes it can be integrated into the device such as a tape recorder.
Amplifier circuit can compensate for sensitivity and periodic mantissa note at the time of
switching between capacitors and microphones by using capacitor amplifier relatively well, and
furthermore, it provides low cost with this table of the table It is something that will last a long
time, such as when it comes to something.
(1) (1), [F]) is a fingerless state of one embodiment of a condenser microphone in which the
characteristic switching device according to the present invention is stubborn Year-inter-finger
sex state 1 + + 11 Figure, Figure 42 is a characteristic curve diagram of the condenser
microphone of the device according to the present invention, Fig. 3 · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · A concrete diagram of the example of the old case performed in the
input 101 path of the recording amplifier of the tape recorder · · · Fig. 4 is a bamboo switching of
the compensation of the microphone by the output circuit of the recording amplifier of the tape
recorder 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 2 · · · · · · · · · ·
· · "collection 4 · @ conflict interlock switch 4a @ φ · Contact piece, 4b, 4c ◆ · · · · contact point,
5Φ book · external microphone human power jack, Su ■ @ margin amplifier, 7 o · rim head, C ˜
C4 · · · · · capacitor · Le · · · FL · · · 0-Joke practical model registration applicant Nippon Victor Co.,
Ltd. company formulator patent attorneys Tadahiko Ito (lO) Figure 1 (A) 4 c door 1 plug 132 ( 8)
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ζ 4 妹 1 妹 Fig. 2 1 ° C; ン 2--ゝ 1 · 7 arrows. -One round Nokaki 14430-Eighty law attorneys
Ito Tatsumi Fig. 3-and-Oneness 4j--4C6R. No 4m 69-2 121. "" ° Yu · "" U---1 Stomach; 14430-A?
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