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DESCRIPTION JPS5975792

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DESCRIPTION JPS5975792
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
performance apparatus for singing to a microphone according to reproduction music from a tape
recorder or the like and amplifying and expanding an audio signal from the microphone. In
recent years, a performance apparatus has been widely spread that sings in accordance with the
configuration of the conventional example and the melody of the problem music, and electrically
and acoustically amplifies the song. This is called a so-called karaoke apparatus, and a music
signal reproduces, for example, a tape recorder, amplifies it, and amplifies it from a speaker. It is
a device that sings to the micro-bon according to this music, and at the same time the audio
signal from the microphone is amplified and amplified to enjoy. The following describes the
conventional playing device. FIG. 1 is a block diagram of a conventional performance apparatus,
in which 1 is a microphone, 2 is a tape recorder, 3 is an amplification means, 4 is a speaker box,
and 6 is a speaker. The amplification means 3 is connected to amplify the outputs of the tape
recorder 2 and the microphone 1 and drive the speaker 6. The speaker box 4 is configured to be
in a closed state to enhance the acoustic characteristics of the speaker 6 and has a role of a case
where the tape recorder 2 is attached. The music tape (not shown) is reproduced by the tape
recorder 2 and the output thereof is amplified by the amplification means 3 and is amplified by
the speaker 5. Then, according to the melody of the music, the voice signal of the microphone 1
singing to the microphone 1 is mixed with the music signal by the amplification means 3 and
amplified, and is simultaneously amplified from the speaker 6. In this way, you can satisfy the joy
of singing and let many audiences enjoy the joy and enjoyment of singing. However, in the above
configuration, the sound output of the speaker 6 has to be increased in order to be heard by a
large audience. As a method of realizing this ice, it is necessary to increase the electric output of
the amplification means 3, which makes the amplification means 3 itself expensive and also the
power supply (not shown) supplying power to it expensive. . In addition, the speaker 6 is
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expensive because it has to have a large allowable input power and a high efficiency of electric /
acoustic conversion. Furthermore, as the input power of the diaphragm (not shown) of the
speaker 6 is higher and the frequency is higher, divisional vibration is more likely to occur, and
characteristics in the middle to high range as shown in the acoustic frequency characteristic
diagram shown in FIG. Irregularities P occur. As a result, the sound of a particular frequency is
intensified or otherwise weakened, which is an unpleasant sound.
On top of that, it is desirable for playing equipment to make the sound pressure level in the midrange (eg 200 Hz to 2 kilohertz) higher than that in the other frequency ranges in order to
improve the volume of the voice and the sound passage. It is technically difficult to match the
acoustic characteristics to it, and the electrical characteristics of the amplification means 3 must
be set as such, and thus there is a problem that the amplification means 3 becomes more
expensive, etc. SUMMARY OF THE INVENTION The present invention solves the above-described
conventional problems, and provides a playing device capable of enhancing the sound output
with a simple configuration and realizing necessary sound characteristics. Configuration of the
Invention The present invention is a playing apparatus having a speaker unit in which a plurality
of speakers are installed in a common speaker box. The sound output is enhanced by driving the
speakers in common and the acoustic characteristics of the speakers are increased. It is made to
be able to obtain different comprehensive acoustic characteristics necessary for the device.
Description of the embodiment Fig. 3 shows the structure of a musical performance apparatus
according to an embodiment of the present invention. In FIG. 3, 1 is a microphone, 2 is a tape
recorder, 3 is an amplification means, 4 is a speaker box, 6 is a speaker unit, 61 is a first speaker,
62 is a second speaker as in the conventional example of FIG. It is a speaker. The amplification
means 3 is connected to mix and amplify the outputs of the tape recorder 2 and the microphone
1 to drive the first speaker 61 and the second speaker 62 in common. The speaker unit 6 is
composed of a first speaker 61 and a second speaker 62. The first speaker 61 and the second
speaker 62 are installed inside the speaker box 4. With the above configuration, the tape
recorder 2 reproduces a music tape (not shown), and the mute signal is amplified by the
amplification means 3 and supplied to the first speaker 61 and the second speaker 62. . On the
other hand, the audio signal from the microphone 1 which is sung toward the microphone 1
while listening to the music is mixed with the music signal by the amplification means 3 and
amplified. As a result, the US-thick and voice are mixed and amplified from the first speaker 61
and the second speaker 62. And both the singer and the audience can enjoy the song. Here,
various acoustic characteristics can be obtained by providing a difference between the electrical
and acoustic characteristics of the first speaker 61 and the second speaker 62. For example,
using the sound pressure frequency characteristics of the first speaker 61 shown in FIG. 4 and
those of the second speaker 62 used in FIG. 4B, the respective sounds are synthesized, as shown
in FIG. The sound of the characteristic.
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That is, when the lowest resonance frequency of the first speaker 61 is set to a frequency higher
than that of the second speaker 62, the phase and amplitude of each sound pressure are different
in the low frequency range (260 Hz or less), as shown in FIG. The level is as shown in C. Also, in
the middle and high frequency range (250 Hz to 2 kHz), sounds of the same phase and amplitude
are synthesized, as shown in FIG. The sound pressure shown in FIG. 4C is 3 dB higher than B or
B. Furthermore, in the high frequency range (2 kHz or more), the diaphragm (not shown) of each
speaker is likely to be divided and vibrated, and both A and B in FIG. Then, the synthesized
speech is a vector sum of the respective sound pressures and is flattened as shown in FIG. 4C,
and its level becomes lower than that of the middle and high frequency range. That is, as shown
in FIG. 4C, the sound pressure in the middle and high frequency range is high, the unevenness is
small in the high frequency range, and the sound pressure is slightly lower than that in the
middle and high frequency range. The street is an ideal sound that can not be used even if
listening for a long time. On the other hand, if the sound pressure frequency characteristics of
the first speaker 61 and the second speaker 62 are set to be the same as in FIG. 4A, the
unevenness of the characteristics is emphasized in the high frequency range, It sounds
unpleasant. Also, in the low frequency range, the bass is insufficient and the volume is reduced.
Furthermore, if the speakers with sound pressure frequency characteristics as shown in FIG. 4B
are respectively used for the first speaker 61 and the second speaker 62, the unevenness of the
characteristics is similarly emphasized in the high frequency range, resulting in unpleasant
sound. At the same time, in the low frequency range, the bass level becomes high, causing
stagnation in the sound and the voice path becomes worse. Next, the output power of the
amplification means 3 and the allowable input power of the first speaker 61 and the second
speaker 62 will be described. Assuming that the required sound output is constant, the
synthesized sound of the first speaker 61 and the second speaker 62 increases by about 3 de /
bell in the middle and high frequency region more than that of the single speaker 61, so the
output power of the amplification means 3 is that much It can be configured at low cost because
it does not require a special frequency characteristic. Still, the first speaker 61 and the second
speaker 62 can make the allowable input power smaller than the case where they are used alone,
and the respective speakers can be manufactured inexpensively. Although the first speaker 61
and the second speaker 62 are added to the inside of the speaker box 4, the sound pressure
frequency characteristics are different from each other, so mutual interference through the air
inside the speaker box 4 is generated. As a result, even without providing a baffle plate between
the first speaker 61 and the second speaker 62, a sound suitable for the performance device can
be obtained.
Although the sound pressure frequency characteristic was mainly described in the above
description, if the characteristics of the first speaker 61 and the second speaker 62 are different
with respect to other transient response characteristics, distortion characteristics, etc. Sometimes
a suitable sound can be obtained. As described above, according to the present invention, a
speaker unit including a plurality of speakers is installed in a common speaker box, and the
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speakers having different acoustic characteristics are used to increase the sound output in the
middle to high frequency range. In the high frequency range, the adverse effect of the divided
vibration of the diaphragm can be reduced, and in the low frequency range, it has an excellent
effect that an ideal characteristic can be obtained as a playing device with less muffle of sound.
Also, since a plurality of speakers are used, the sound output is higher than that of a single
speaker, and the output power of the amplification means and the allowable input power of each
speaker can be reduced accordingly. It can be configured inexpensively. Even if the space
between the speakers is not cut in the speaker box, the characteristics of the speakers are
different from each other, so that mutual interference does not occur, and the effect is great.
[0002]
Brief description of the drawings
[0003]
Fig. 1 is a block diagram of a conventional playing device, Fig. 2 is a diagram of the same sound
pressure frequency characteristics, Fig. 3 is a diagram of a playing device according to an
embodiment of the present invention, and Fig. 4 is a same sound pressure frequency
characteristics diagram. .
DESCRIPTION OF SYMBOLS 1 ... Microphone 2 ......... Tape recorder 3 ......... Amplifying means 4 ...
Speaker box 6 ... Speaker part 61 .. ... first speaker, 62 ... second speaker. Name of Agent Attorney
Nakao Toshio and 1 other person Figure 1 Figure 4 Figure 2 Figure 2 Figure 2 Figure 2 Figure 2
Figure 1 Figure 4 Iflef (Hz)
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