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JPS60137199

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DESCRIPTION JPS60137199
[0001]
(A) Industrial Application Field The present invention relates to the improvement of an acoustic
device, and in particular, to improve the sense of hearing when using a center vocal speaker. (B)
Prior art Devices are known that can sing songs in accordance with music obtained from music
sources such as magnetic tapes and records (generally called karaoke devices). This is to mix a
microphone signal such as a singing voice obtained from a microphone with a source signal
obtained from a music source and emit the sound from a speaker, and since it is possible to
easily sing a song without live performance, it is widely used now ing. Thus, such a karaoke
apparatus is provided with various work so that the singing voice can be heard well, and as
described in, for example, JP-A-58-137108, it incorporates an echo circuit for echoing the
singing voice. There is something. In addition, there is also known a karaoke apparatus in which
a 2-channel stereo system is used to obtain a sense of reality, and a center vocal speaker is
further added to form a 3-channel system. By the way, the above-mentioned center vocal speaker
is not usually built in the main body of the karaoke apparatus, and is arranged so as to be
connectable to the karaoke apparatus by a plug jack. FIG. 1 shows a karaoke apparatus in which
such a center vocal speaker can be used, (1) a microphone, (2) an amplification circuit for
amplifying a microphone signal from the microphone (1), (3) Is a microphone volume for
adjusting the level of the amplified microphone signal obtained at the output end of the
amplification circuit (2), and (4) is responsive to the level-adjusted microphone signal obtained at
the output end of the microphone body (3) (5) is an echo volume for adjusting the level of the
echo signal, (6) is a microphone signal obtained at the output end of the microphone volume (3)
and the echo signal generation circuit for generating an echo signal. Echo volume (5). (7) is a
music source generating left and right stereo signals, (8) is a left mixing signal from the music
source (7) and the first mixing circuit. A second mixing circuit for mixing with the output signal
of the circuit (6), (9) a left amplification circuit for amplifying the output signal of the second
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mixing circuit (8), QO for a left speaker, Uυ for the music source ( 3) a third mixing circuit for
mixing the right stereo signal from 7) with the output signal of the first mixing circuit (6), (one is
a right amplification circuit for amplifying the output signal of the third mixing circuit a ', Q Right
speaker, αa is a center amplification circuit for amplifying the output signal of the first mixing
circuit (6), (one is a center vocal speaker, and (a switch for switching the output signal of the first
mixing circuit (6)) It is a switch.
In FIG. 1, without using the center vocal speaker, the left stereo signal from the music source (7)
and the output signal of the first mixing circuit (6) The second stereo mixing circuit (8) mixes and
applies to the left speaker α0), and the right stereo signal from the music source (7) and the
output signal of the first mixing circuit (6) Mixed and applied to the right speaker (13).
Therefore, the left and right stereo signals from the music source (7) are correctly separated and
a stereo feeling is obtained, and the output signals of the first mixing circuit (6) become equal at
the left and right speakers QO) and 餞, A sound image corresponding to the output signal of the
mixing circuit (6) is localized at a central position between the left and right speakers (10) and 0.
On the other hand, when the center vocal speaker (19 is used and the changeover switch α6) is
switched to the opposite state as illustrated, the left stereo signal of the music source (7) is
displayed on the left speaker 00, and the right speaker Q3) The right stereo signal of the music
source (7) is applied to the center vocal speaker (15) and the output signal of the first mixing
circuit (6). Therefore, the left and right stereo signals from the music source (7) are correctly
separated and stereo feeling is obtained, and the sound corresponding to the microphone signal
of the echo of the center vocal speaker θ9 is emitted, and the singing voice is localized at the
center position Do. However, with the circuit configuration as shown in FIG. 1, when the center
vocal speaker (19 is used, not only the sound corresponding to the microphone signal but also
the echo is emitted only from the center bonical speaker α5j, a feeling of echo is sufficient.
There is a drawback that the reality is deteriorated. (〕 → Purpose of the Invention) The present
invention has been made in view of the above-described points, and an object of the present
invention is to provide an acoustic device in which the circuit configuration is devised so that a
sense of reality can be obtained. The acoustic device according to the present invention
generates an echoed microphone signal by mixing an echo signal generation circuit which
generates an echo signal in response to a microphone signal, the microphone signal and the echo
signal. The microphone circuit with echo is supplied to the center vocal speaker when the mixing
circuit and the center vocal speaker are used, and the echo signal is supplied to the left and right
speakers while the microphone signal with echo is not used when the center vocal speaker is not
used. It is comprised by the switching circuit supplied to a right-and-left speaker. (E) Embodiment
FIG. 2 is a circuit diagram showing an embodiment of an acoustic device according to the present
invention, wherein a force is a microphone signal with echo obtained at the output end of the
first mixing circuit (6) as a center vocal A first switching switch which is switched to be supplied
to the center vocal speaker α5) when connected to the speaker α5) and to be supplied to the
center vocal speaker (left and right speakers 00) when not in use, and 0 darkened It is a second
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switching switch which is switched in conjunction with the changeover switch (I7) and switched
to supply an echo signal to the left and right speakers 00) and α3) when the center vocal
speaker 05) is used.
In FIG. 2, the same circuit parts as in FIG. 1 are given the same reference numerals and the
explanation thereof is omitted. Now, assuming that the center vocal speaker (15) is used and the
first and second changeover switches (1.eta. And 08) are switched to the state shown in the
figure, they are obtained at the output end of the first mixing circuit (6). The microphone signal
with echo is applied to the center amplification circuit (14) via the first switching switch α,
amplified by the center amplification circuit 04), and then applied to the center vocal speaker a9.
Also, the echo signal that is output to the output end of the echo volume (5) is applied to the
second and third mixing circuit (8) and the crucible via the second switching switch (18), and the
second and third After being mixed with the left and right stereo signals obtained from the music
source (7) in the 3-mixing circuit (8) and αυ, respectively, the left and right amplifier circuits
(9) and (1) are applied. The output signal of the left amplifier circuit (9) is applied to the left
speaker QO, and the output signal of the right amplifier circuit (1210) is applied to the right
speaker (13). As a result, the sound corresponding to the mixed signal of the left stereo signal
and the echo signal from the left speaker (10) and the sound corresponding to the mixed signal
of the right stereo signal and the echo signal from the right speaker α3) are center vocals. The
loudspeakers (io each generate a sound corresponding to the microphone signal with echo, so
that a good sound with a sense of presence can be obtained. When the center vocal speaker 05)
is not used, the first and second changeover switches (17) and the alpha barrel are switched to
the opposite state to that shown, and the microphone signal with echo obtained at the output end
of the first mixing circuit (6) Are mixed with the left and right stereo signals from the music
source (7) at the second and third mixing circuits (8) and 0υ respectively. This state is identical
to that of FIG. 1 and the details are omitted. Incidentally, when the center vocal speaker is not
used, the second switching switch (the second switching switch is switched to the state opposite
to that shown in the drawing, so that the second switching switch a is marked through the echo
volume (5) through the buffer (19). The echo signal arriving at is not used. FIG. 3 is a schematic
view showing a jack into which the plug of the center vocal speaker θω is inserted, and FIG. 3
(a) shows the center vocal speaker (when not in use, FIG. 3). Indicates the state of use. Thus,
when the center vocal speaker α 9 is not used, as shown in FIG. 3 (A), the terminals (2 (1, 1
contact point (2+)) connected to the first mixing circuit (6) in FIG. And (The terminal t24
connected to the terminal (c) connected to the second and third mixing circuits (8) and α1
through the two functions and connected to the echo polymer z-mm (5) is open It is done.
Therefore, as described with reference to FIG. 2, the right and left speakers (10) and (13)
generate sounds according to the mixed signal of the left and right stereo signals and the
microphone signal with echo. On the other hand, when using the center vocal speaker (to), as
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shown in FIG. 3 (b), the plug (25) is inserted to disconnect the contact (company) from the
contact (21), and the contact C26) To be touched. Therefore, the microphone signal with echo
applied to the terminal (20) is applied from the contact point (27) through the plug (25) to the
sense vocal speaker (on the side of the center amplification circuit for one, and the terminal (24J
An echo signal applied to the signal is applied to the second and third mixing circuits (8) and
αυ via the contact (26), the contact (22), and the terminal (23). Therefore, sounds
corresponding to the microphone signal with an echo are generated from the center vocal
speaker αω, and sounds corresponding to a mixed signal of the left and right stereo signals and
the echo signal are generated from the left and right speakers (9) and α. (E) Effects of the
Invention As described above, according to the present invention, since echo signals are applied
to the left and right speakers when using the center vocal speaker, it is possible to improve
hearing. Also, as shown in FIG. 3, if circuit switching is performed simply by inserting the jack of
the center vocal speaker, it is not necessary to provide a special switching operation button, and
operability is improved and the circuit is simplified. I can do it.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a circuit diagram showing a conventional acoustic device, FIG. 2 is a circuit diagram
showing one embodiment of the present invention, and FIGS. 3 (a) and 3 (b) are plug jacks used
in the present invention. It is a model figure which shows a relation.
Explanation of main figure numbers (4) ... Echo signal generation circuit, (6) ... First mixing
circuit, (8) (11) ... First and second mixing circuit, Go) Q31 · · · Left and right speakers, (1... Center
vocal speaker, (t71... 'First switch, α town,... Second switch). Figure 3 (a) (0)
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