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JPS6128294

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DESCRIPTION JPS6128294
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
characteristic-controlled microphone based on sound source distance used for speech, singing
and the like. The configuration of the conventional example and its problems 21 and 7 The
conventional speech or vocal microphones generally use a single directional microphone, and
therefore, low frequencies may be used depending on the distance from the sound source such as
the mouth. The frequency characteristics have changed. This is because the sound emitted from
the mouth of a human being is close to the above-mentioned microphone, the sound is spherical
wave and the flash speed component enhances the bass characteristic, and when it is far from
the above-mentioned microphone, the sound becomes plane wave, and the frequency
characteristic becomes flat. It is for. An example of how the frequency characteristic changes is
shown in FIG. FIG. 1 shows the pattern of changes in frequency characteristics caused by the
distance between the conventional unidirectional microphone and the sound source. The solid
line a is the characteristic when separated by 50 cm or more, and when it approaches the sound
source such as '10 cm, 5 cm, 3 cm, the broken line l] and the alternate long and short dash line
C2 dotted line d have a width of about You can see by coming up. In the case of speech, such a
phenomenon makes the voice unclear by approaching, and in the case of singing etc., the timbre
changes depending on the distance of the microphone and the naturalness is lost. Had
disadvantages such as. OBJECTS OF THE INVENTION The present invention is to eliminate the
drawbacks of the conventional Go system, and in a unidirectional microphone, an excellent sound
source distance which does not affect the output frequency characteristic even if the distance to
the sound source changes. It is an object of the present invention to provide an output control
type microphone by In the present invention, in order to achieve the stated purpose, two
directional microphone units are arranged on the same straight line, and two microphones with
the microphone unit far from the sound source as the standard frequency characteristic The low
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frequency characteristic of the microphone unit closer to the sound source is corrected based on
the difference between the frequency characteristics of the units. This has the advantage that the
original sound can be faithfully reproduced even if the distance to the sound source changes.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the
present invention will be described below with reference to the drawings. FIG. 2 is a block
diagram showing a basic configuration of a microphone according to an embodiment of the
present invention. 1 is a single directional first microphone unit 2 is a single directional second
microphone unit, and the first microphone unit 1 and the second microphone unit 2 are arranged
on the same straight line. These intervals l are set to, for example, about 5 cm. A differential
amplifier 3 detects an output difference between the first microphone unit 1 and the second
microphone unit 2.
4 is a low pass filter which passes only the reduced output of the differential amplifier 3 and 5 is
an amplifier which amplifies the output of the low pass filter 4 (7) and outputs it as a control
signal 9. On the other hand, the first microphone unit The output signal of 1 is amplified by the
preamplifier 6 and output to the low pass variable filter 7. The low-pass variable filter 7 receives
the output of the preamplifier 6, changes the filter characteristics according to the magnitude of
the control signal 9, and outputs an output signal from the output terminal 8. The output signal
of the first microphone unit 1 from the preamplifier 6 changes the frequency characteristic of
the low band according to the distance between the sound source of human voice and the first
microphone unit 1. For example, when the sound source and the first microphone unit 1
approach, the difference signal in the low frequency range of the first microphone unit 1 and the
second microphone unit 2 becomes large, and the low frequency range rises. The control signal 9
is increased, the constant of the low pass filter is varied, and control is performed to attenuate
the bass range of the output of the preamplifier 6. Conversely, when the sound source and the
first microphone unit 1 are separated, the difference signal in the low frequency range of the first
microphone unit 1 and the second microphone unit 2 becomes smaller, and the control signal 9
becomes smaller, It does not affect the output of the preamp 6. Thus, regardless of the distance
from the sound source emitted from the mouth, the microphone unit can always obtain a
constant low-pass characteristic. As is apparent from the above embodiments, the present
invention arranges two directional microphone units on the same straight line, and uses the
microphone unit far from the sound source as the standard frequency characteristic. Since the
low frequency 6 ··· 7 number characteristic is corrected, it has the advantage of being able to
faithfully reproduce the original sound even if the distance to the sound source changes
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a diagram showing changes in frequency characteristics caused by the distance between
a conventional microphone and a sound source, and FIG. 2 is a block diagram showing a basic
configuration of a microphone according to an embodiment of the present invention.
I 1st microphone unit 2 2nd microphone unit 3 differential amplifier 4 low pass filter 5 amplifier
6 preamp 7 low pass Variable filter, 8 ... output terminal, 9 ... control signal.
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