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JP2008134422

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2008134422
The present invention provides a karaoke apparatus capable of imparting directivity to singing
voice while securing sound quality from low to high. A high-sound speaker set 5H, a mid-sound
speaker set 5M, and a low-sound speaker set 5L are provided. A phase difference compensation
filter is provided at the subsequent stage (preceding stage of the DAC) of the mixer that mixes the
audio signal output from each audio beam control unit. The phase difference compensation filter
41H compensates for the difference between the phase characteristics of the speaker set 5H and
the speaker set 5M. The phase difference compensation filter 41L compensates for the difference
between the phase characteristics of the speaker set 5L and the speaker set 5M. The phase
difference compensation filter 41M provides the same delay as that occurring in the other filters.
[Selected figure] Figure 1
Karaoke device
[0001]
The present invention relates to a karaoke apparatus capable of controlling the directivity of
singing voices.
[0002]
Karaoke devices are installed in places where one room is occupied by a single group (such as a
karaoke box), and often installed in places where unspecified customers gather (e.g., restaurants
such as snack shops).
[0003]
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1
The conventional karaoke apparatus spreads accompaniment sound and singing voice in the
shop using a stereo speaker.
Therefore, when installed in a store where the above-mentioned unspecified customers gather, it
is possible for all the people in the store to hear the singing voice that anyone sings.
[0004]
In a restaurant such as a snack, the singing of another person (other group) is not necessarily
what you want to listen to, and in some cases it may be annoying.
However, in the above-mentioned conventional karaoke apparatus, since the singing voice of the
singing person is emitted to the whole store, there is a problem that all the customers have to
listen to the karaoke singing.
[0005]
Therefore, by using a speaker array, a device has been proposed in which directivity is given to
the sound emission so that only the group in which the singer is present can hear the singing
voice (for example, see Patent Document 1). JP 2005-173137 A
[0006]
In the device shown in Patent Document 1, in order to strengthen the directivity of the sound
emission of the speaker array, it is necessary to shorten the distance between the speaker units
constituting the speaker array, and the speaker unit has a small diameter. Was often used.
[0007]
When a small-aperture speaker unit is used, it is easy to give directivity, but there is a problem
that it is not possible to obtain sufficient sound quality (particularly, the sound quality of bass).
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[0008]
An object of the present invention is to provide a karaoke apparatus capable of imparting
directivity to singing voice while securing sound quality from low to high.
[0009]
According to the karaoke apparatus of the present invention, a plurality of speaker sets each
including a plurality of speaker units are arranged, including storage means storing song data for
generating accompaniment sounds of karaoke songs, a microphone for inputting singing voice,
and a plurality of speaker units A speaker array having speaker units of different aperture sizes
among the speaker sets, a sound emission processing unit for giving directivity to sound
emission by delaying input of the accompaniment sound and singing voice to each speaker unit,
and input to each speaker unit And controlling the output processing unit to output the
accompaniment sound in a nondirectional manner, and the plurality of phase compensation
filters for correcting differences in phase characteristics among the plurality of speaker sets. And
control means for controlling the singing voice to have directivity in a specific direction and
outputting the singing voice.
[0010]
In this configuration, a speaker array in which a plurality of speaker sets are arranged is
provided.
The speaker array arranges speaker units of different apertures between the speaker sets.
For example, a speaker set in which small diameter speaker units are arranged and a speaker set
in which large diameter speaker units are arranged are configured.
The speaker sets may be arranged on the same straight line or in parallel.
Using these speaker sets, the singing voice is directed to a specific direction and output. The
sound quality from low to high is secured by using speaker units with different diameters.
Speaker units with different apertures have different phase characteristics and phase
interference may occur. However, correct the singing voice signal and accompaniment voice with
a filter that compensates for the phase difference between the speaker sets and then input to the
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speaker unit .
[0011]
Further, the present invention further comprises a microphone position detection unit for
detecting the position of the microphone, and the control means is configured to output the
singing voice with directivity in a direction including the position of the microphone. It controls
the sound emission processing unit.
[0012]
In this configuration, the position of the microphone is detected, and an audio beam is set to be
output in a direction including the position of the microphone.
It is sufficient for the singing voice to be emitted in the direction of the singer and its
surroundings (groups), so that the directivity may be limited to the direction including the
microphone position.
[0013]
Further, according to the present invention, the speaker set further includes a large aperture, a
medium aperture, and a small aperture speaker unit arrayed respectively, and the plurality of
phase compensation filters are input to the large aperture speaker unit. And a small-aperture
phase compensation filter for correcting a phase difference of voice input to a small-aperture
speaker unit.
[0014]
In this configuration, it has a speaker set in which small diameter speaker units are arranged, a
speaker set in which medium diameter speaker units are arranged, and a speaker set in which
large diameter speaker units are arranged.
A large aperture phase compensation filter and a small aperture phase compensation filter are
provided so as to compensate for the phase difference between the large aperture and small
aperture speaker sets with reference to the medium aperture speaker unit. A further
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improvement in sound quality can be expected by having a large-bore speaker for bass, a
medium-aperture speaker for medium sound, and a small-bore speaker for high sound. In
addition, by using a medium-aperture speaker unit for medium sound including the main band of
human voice as a reference, it is not necessary to install a phase compensation filter for all
speaker sets.
[0015]
According to this invention, it is possible to give directivity to singing voice while securing the
sound quality from low to high.
[0016]
A karaoke apparatus according to an embodiment of the present invention will be described with
reference to the drawings.
FIG. 1 is a block diagram of a karaoke apparatus, and FIG. 2 is an external view of a speaker array
used in the karaoke apparatus.
[0017]
The karaoke apparatus 1 includes a microphone 2, a driver amplifier 3H, a driver amplifier 3M, a
driver amplifier 3L, a signal processing unit 4, a speaker set 5H, a speaker set 5M, a speaker set
5L, an ADC 6, a microphone position detection unit 7, a control unit 8, an accompaniment The
reproduction unit 9 and the storage unit 10 are provided. In the embodiment of the present
invention, the speaker set refers to an arrangement of a plurality of speaker units.
[0018]
The karaoke apparatus 1 receives a request for a karaoke song, reads the song data of the song,
performs a karaoke performance, and displays the lyrics of the karaoke song on a monitor (not
shown). At the time of the karaoke performance, the accompaniment sound of the karaoke song
(Karaoke performance sound) is generated. Also, play the guide vocal sound. The karaoke
performance sound and the guide vocal sound are amplified by the driver amplifier 3H, the
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driver amplifier 3M and the driver amplifier 3L and emitted from the speaker set 5H, the speaker
set 5M and the speaker set 5L.
[0019]
The speaker set 5H, the speaker set 5M, and the speaker set 5L are configured by arranging
speaker units in a matrix as shown in FIG. 2A, and constitute a speaker array as a whole. The
speaker set 5H, the speaker set 5M, and the speaker set 5L are arranged in parallel in the lateral
direction (array major axis direction).
[0020]
The speaker set 5H is obtained by arranging the high sound range speaker units 51H to 5nH on
a straight line, and the number of arranged units is, for example, 16 as shown in FIG. The speaker
set 5M is a linear arrangement of speaker units 51M to 5nM for the midrange, and the number
of the arrayed units is, for example, 10 as shown in FIG. The speaker set 5L is a linear
arrangement of the speaker units 51L to 5nL for the low frequency band, and the number of the
arrayed units is, for example, five as shown in FIG. The speaker units 51H to 5nH for high
frequency range have a smaller diameter compared to the speaker units 51M to 5nM, and the
speaker units 51L to 5nL for low frequency range have a larger diameter than the speaker units
51M to 5nM It is a unit.
[0021]
The number of arranged speaker units and the arrangement mode are not limited to this
example. As shown in FIG. 2B, speaker units having different diameters may be arranged on one
straight line. Further, as shown in FIG. 2C, the speaker units may be dense near the center of the
array and sparse near the array end. Alternatively, the arrangement may be as shown in FIG. In
the example shown in FIG. 2D, the high-range speaker units 51H to 5nH are linearly arranged in
parallel in two lines, the middle-range speaker units 51M and 5nM are arranged outside the row,
and further outside The low-range speaker units 51L and 5nL are arranged. By arranging in this
manner, the speaker array can be configured in a compact case. In the example shown in the
figure, the tweeter 51 T and tweeter 5 nT that emit higher-pitched sound (for example, 10 kHz or
more) than the high-pitched speaker unit are arranged to improve the sound quality, but in the
present invention Not required.
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[0022]
An audio beam is formed and released by delaying and inputting an audio signal to each speaker
unit of the speaker set 5H, the speaker set 5M, and the speaker set 5L of this configuration (for
example, the configuration of FIG. 2A). Sound directivity can be given. In addition, it is also
possible to output with nondirectionality.
[0023]
Here, beam control will be described with reference to FIG. FIG. 3 is a diagram for explaining the
principle of forming an audio beam. The same figure (A) has shown the case where the same
audio | voice signal is simultaneously input to several speaker unit SP located in a line. In this
case, the same sound is emitted simultaneously from each speaker unit SP. The sound waves
output from the individual speaker units SP propagate radially (circularly). Here, in the synthetic
waveform of the sound wave output from each speaker unit SP, the component propagating
forward is synthesized and strengthened. On the other hand, components propagating in
directions other than the front are canceled by interference of signal components output from
the respective speaker units SP. Therefore, only the forward component is enhanced by the
synthesis into a speech beam.
[0024]
The figure (B) is a figure shown about delay time control in the case of forming a voice beam
from a plurality of speaker units SP shown in the figure (A) diagonally. In this figure, the voice
beam is formed from the front to the right at an angle of θ. In this case, voice is first output from
the speaker unit SP at the end (left end in the same figure) opposite to the direction of the beam,
and after that time each time time τ elapses adjacently to the beam Audio is output to the
adjacent speaker unit SP.
[0025]
By sequentially delaying the sound output from the speaker units SP arranged in a line from one
end toward the other end in this manner, the sound beam can be directed in an oblique direction
as shown in FIG.
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[0026]
The control unit 8 includes a CPU, reads out song data of the karaoke song requested by the
singer from the storage unit 10, and inputs the data to the accompaniment playback unit 9.
Requests for karaoke songs are made using a remote controller (not shown) or the like. In
addition, the control unit 8 reads beam control data (data defining the delay amount of the audio
signal input to each speaker unit) for controlling the audio beam of the speaker array from the
storage unit 10. Take control.
[0027]
The accompaniment reproducing unit 9 includes a guide vocal reproducing unit in addition to a
sound source for generating musical tones, generates a karaoke performance sound, and
reproduces a guide vocal voice which is audio data. Guide vocal data is included in the song data
of each karaoke song. The karaoke performance sound generated by the accompaniment
reproduction unit 9 and the guide vocal sound are input to the signal processing unit 4. In
addition, the singing voice signal input from the microphone 2 is digitized by the ADC 6 and then
input to the signal processing unit 4.
[0028]
The microphone position detection unit 7 detects the position of the microphone 2. Although any
position detection method may be used for the microphone 2, for example, a method as shown in
FIG. 4 is used. FIG. 4 is a conceptual view showing microphone position measurement. The
microphone position detection unit 7 sets the speaker set 5H via the signal processing unit 4 (in
FIG. 1, the high-pitch singing voice beam control unit 42H, the mid-tone singing voice beam
control unit 42M, or the low-pitch singing voice beam control unit 42L). The same inspection
audio signal (for example, high-frequency audio close to the audible limit) is sequentially input to
one end speaker unit 51H in (or 5M, 5L) and the other end speaker unit 5nH. When the
microphone position detection unit 7 picks up the inspection audio signal from the microphone
2, the microphone position detection unit 7 detects the pickup timing.
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[0029]
The microphone position detection unit 7 counts a time t1 from the timing at which the speaker
unit 51H outputs the measurement voice to the sound collection timing. In addition, the time t2
from the timing when the speaker unit 5nH outputs the measurement sound to the sound
collection timing is counted. The microphone position detection unit 7 calculates the microphone
position using the time t1 and the time t2. That is, the microphone position detection unit 7 can
measure the distance between the speaker unit 51H and the microphone 2 and the distance
between the speaker unit 5nH and the microphone 2 from the relationship between the times t1
and t2 and the speed of sound, and the speaker unit 51H and the speaker unit If distance
information between 5 nH is included, the position of the microphone 2 can be measured by
triangulation. The position of the microphone 2 is, as shown in FIG. 4, a distance r from the
center position (viewed from the top) of the speaker housing and a front direction from the
center position of the housing (speaker sound emitting surface It is expressed by a shift angle θ
with respect to the axis of the orthogonal direction (this is taken as an angle 0 degree).
[0030]
The microphone position detection unit 7 inputs information on the microphone position
detected as described above to the control unit 8. The control unit 8 reads out beam control data
for controlling the sound beam of the speaker array from the storage unit 10 based on the
information of the input microphone position, and controls the signal processing unit 4. Details
will be described later with reference to FIG.
[0031]
The singing voice signal input to the microphone 2 is converted into a digital signal by the ADC 6
and then input to the high voice singing voice beam control unit 42 H of the signal processing
unit 4, and the mid tone singing voice beam control unit 42 M It is input to the singing voice
beam control unit 42L. On the other hand, the karaoke performance sound generated by the
accompaniment reproduction unit 9 and the guide vocal sound are input to the accompaniment
voice beam control unit 43.
[0032]
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The high-tone singing voice beam control unit 42H controls the delay time of each speaker unit
so that the singing voice signal is output as a voice beam in the speaker set 5H. The medium
sound singing voice beam control unit 42M controls the delay time of each speaker unit so that
the singing voice signal is output as a voice beam in the speaker set 5M. The bass song singing
voice beam control unit 42L controls the delay time of each speaker unit so that the singing
voice signal is output as a voice beam in the speaker set 5L. The accompaniment voice beam
control unit 43 outputs the accompaniment voice signal to each speaker unit so that the
accompaniment voice signal is output with nondirectionality (or an audio beam having weak
directivity) in the speaker set 5H, the speaker set 5M, and the speaker set 5L Control the delay
time.
[0033]
The control unit 8 sets separate beam control data for each of the beam control units of the
signal processing unit 4 so that the karaoke performance sound (and the guide vocal sound)
generated by the accompaniment reproduction unit 9 is nondirectional. , And control so that the
singing voice is beamed only in the direction in which the singer and the group are present.
[0034]
The voice signal (singing voice) whose directivity is controlled by the high tone singing voice
beam control unit 42H and the voice signal (Karaoke accompaniment sound, guide vocal voice)
whose directivity is controlled by the accompaniment voice beam control unit 43 are mixer 44H.
Then, each speaker unit is synthesized, passes through the phase difference compensation filter
41H, is converted into an analog voice signal by the DAC 45H for each speaker unit, and is input
to the driver amplifier 3H.
The driver amplifier 3H includes the audio amplifiers 31H to 3nH in a number corresponding to
all the speaker units of the speaker set 5H, amplifies the input audio signal of each speaker unit,
and outputs the amplified audio signal to the speaker set 5H.
[0035]
Similarly, a voice signal (singing voice) whose directivity is controlled by the medium sound
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singing voice beam control unit 42M and a voice signal (Karaoke accompaniment sound, guide
vocal voice) whose directivity is controlled by the accompaniment voice beam control unit 43. Is
synthesized by the mixer 44M for each speaker unit, passes through the phase difference
compensation filter 41M, is converted into an analog voice signal by the DAC 45M for each
speaker unit, and is input to the driver amplifier 3M. The driver amplifier 3M includes audio
amplifiers 31M to 3nM in number corresponding to all the speaker units of the speaker set 5M,
amplifies the input audio signal of each speaker unit, and outputs the amplified audio signal to
the speaker set 5M. The voice signal (singing voice) whose directivity is controlled by the lowpitch singing voice beam control unit 42L and the voice signal (Karaoke accompaniment sound,
guide vocal voice) whose directivity is controlled by the accompaniment voice beam control unit
43 are mixer 44L. Then, each speaker unit is synthesized, passes through the phase difference
compensation filter 41L, is converted into an analog voice signal by the DAC 45L for each
speaker unit, and is input to the driver amplifier 3L. The driver amplifier 3L includes the audio
amplifiers 31L to 3nL in a number corresponding to all the speaker units of the speaker set 5L,
amplifies the input audio signal of each speaker unit, and outputs the amplified audio signal to
the speaker set 5L.
[0036]
As described above, each speaker set outputs a nondirectional voice or a voice beam, thereby
outputting a voice beam as a whole of the speaker array. Here, based on the information on the
microphone position input from the microphone position detection unit 7, the control unit 8 sets
the delay amount for each speaker unit so that the voice beam of singing voice is directed to the
microphone position (angle). Do. Also, the delay amount is set so that the karaoke performance
sound (and the guide vocal sound) output from the accompaniment reproduction unit 9 is output
in a nondirectional manner. As a result, the singing voice is beam output only in the direction in
which the singer and the group are present.
[0037]
Beam control in an actual karaoke shop will be described with reference to FIG. In the figure, the
karaoke apparatus 1 is installed at the corner of the room 61 of the store. Four tables 71 to 74
are installed inside the room 61. This figure shows an audio beam formed when a customer on
table 71 sings a karaoke song. From the speaker sets 5H, 5M, 5L, the karaoke accompaniment
sound (and the guide vocal sound) is emitted to the entire room 61 in a nondirectional manner
(not shown). Further, in the direction of the table 71 of the singer, singing voices are emitted
from the speaker sets 5H, 5M, 5L by the voice beam 81.
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[0038]
By emitting each audio signal in this manner, the accompaniment of the karaoke song can be
heard throughout the room 61, and the singing voice of the singer can be heard only at the table
71 of the singer. In the other tables 72 to 74, there is no need to listen to the singers of other
groups because the accompaniment sounds and guide vocals can be heard. When the singer
moves, for example, when singing is performed in the group of the table 72, the singing voice is
emitted from the speaker sets 5H, 5M, 5L by the audio beam 82. The microphone position
detection unit 7 periodically (or when instructed by a remote control) measures the position of
the microphone 2 and inputs information on the microphone position to the control unit 8.
Therefore, the singing voice is emitted in the direction (group) in which the singer is present.
[0039]
In addition, since the directivity of the voice is not perfect, the singing voices of the singer may
be slightly leaked to the other tables 72 to 74, but a guide vocal voice that sings the same
melody is in this place, Since the sound is emitted at a level higher than the leak level of the
singing voice by the voice beam, the masking effect makes the customer at this table hardly hear
the singing voice.
[0040]
The guide vocal voice may be input to a voice beam control unit (a beam control unit dedicated
to guide vocal voice) (not shown) other than the accompaniment voice beam control unit 43 in
FIG.
Then, in the direction of the other tables 72 to 74, the guide vocal sound may be emitted from
the speaker array by the beams 82, 83, 84 of weak directivity. The accompaniment voice and the
guide vocal voice may be beam-outputted only in the direction in which the singer and the group
are present.
[0041]
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Here, when a plurality of speaker sets including speaker units having different diameters are
disposed in proximity to each other as described above, phase characteristics (phase frequency
characteristics) between the speaker units become a problem. That is, since the speaker units
having different apertures are disposed close to each other, the sounds emitted from the speaker
units may cause phase interference, which may affect the control of the sound quality and the
directivity. In this embodiment, phase difference compensation filters 41H, 41M, and 41L are
provided to compensate for the difference in phase characteristics between the speaker units
(referred to as a phase difference). The phase difference compensation filters 41H, 41M, and 41L
are all-pass filters realized by FIR filters or second-order IIR filters, and correct the phase
characteristics of the input audio signal. The filter coefficient is set by the control unit 8. The
control unit 8 reads the setting parameters of the phase difference compensation filters 41H,
41M, and 41L stored in the storage unit 10, and sets the filter coefficient based on this.
[0042]
FIG. 6 is a diagram showing the concept of phase difference and phase compensation. The figure
(A) is the figure which showed the phase characteristic of the speaker unit for bass, and the
phase characteristic of the speaker unit for middle sound. The horizontal axis of the graph shown
to the figure (A) represents a frequency, and a vertical axis | shaft represents a phase. The phase
characteristic shown in the figure is a characteristic schematically represented to facilitate the
description, and does not represent the measurement result of the phase characteristic of the
actual speaker unit.
[0043]
As shown to the figure (A), in the speaker for middle sound, the phase to frequency f1 becomes
ra1. On the other hand, the phase for the frequency f1 in the low frequency speaker is ra2.
Therefore, the phase difference between the mid-range speaker and the low-range speaker at the
frequency f1 is ra1-ra2.
[0044]
The figure (B) is the figure which showed the characteristic of the phase difference compensation
filter. The horizontal axis of the graph shown to the figure (B) represents a frequency, and a
vertical axis | shaft represents a compensation phase. The characteristic of the compensation
04-05-2019
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phase is defined so as to make the phase difference shown in FIG. In this example, the
compensation is performed so that the phase difference becomes zero on the basis of the midtone speaker, so that the compensation phase at the frequency f1 is ra1-ra2. A filter coefficient
having such a compensation phase is set in the phase difference compensation filter disposed in
the front stage of the bass speaker.
[0045]
As described above, FIG. 6 shows an example of the phase characteristic of the speaker unit and
is not an actual measurement result. In practice, the phase characteristics of the speaker sets 5H,
5M, 5L are measured, the filter coefficients are calculated in advance so as to compensate for the
phase difference, and this is stored in the storage unit 10. The control unit 8 reads out the
calculated filter coefficients and sets them in the phase difference compensation filters 41H,
41M, and 41L. When an FIR filter is used as the phase difference compensation filter, the phase
difference compensation filters 41H and 41L are used as the phase difference of the speaker sets
5H and 5L based on the medium sound speaker set 5M including the main band of human voice
It should be compensated. The filter coefficients are obtained by inverse Fourier transform of the
phase difference. Since the delay occurs in the signal as the number of taps of the FIR filter
increases, the same delay is given to the phase difference compensation filter 41M
corresponding to the speaker set 5M as a reference. The high-pitched speaker set 5H may be
used as a reference, or the low-pitched speaker set 5L may be used as a reference.
[0046]
When a second-order IIR filter is used as the phase difference compensation filter, filter
coefficients are defined as follows. FIG. 7 is a diagram showing the characteristics of the phase
difference compensation filter in the case of using a second-order IIR filter. The horizontal axis of
the graph shown in the figure represents frequency, and the vertical axis represents phase. The
figure (A) shows the phase characteristic of the speaker unit for middle sound and for the low
tone, the figure (B) shows the characteristic of a filter, and the figure (C) shows the speaker unit
after phase compensation. It shows phase characteristics. The characteristics shown in the figure
are also schematically represented for ease of explanation, and do not show the actual
characteristics of the speaker unit and the filter.
[0047]
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As shown in the figure (A), the speaker unit for medium sound and the speaker unit for low
frequency have different phase characteristics. Therefore, a predetermined phase difference is
generated as shown in the graph shown at the bottom of the paper of FIG. The phase difference
is compensated by a filter (filter for medium sound) provided in the speaker unit for medium
sound and a filter (filter for bass) provided in the speaker unit for bass. As shown in the figure
(B), the filter for middle tone and the filter for low tone have the difference of the filter
characteristic which compensates the phase difference shown in the figure (A). Therefore, in the
speaker unit for medium sound and the speaker unit for low frequency, the phase difference is
reduced as shown in the graph at the bottom of the sheet of FIG. As described above, by
providing the second-order IIR filter at the front stage of each speaker unit (speaker set), it is
possible to realize an all-pass filter that compensates for the phase difference. The characteristics
shown in the figure are not the actual measurement results. Of course, the filters actually used
are not limited to one as shown in FIG.
[0048]
Note that the frequency band for performing phase compensation may be limited. That is, phase
compensation is performed only in a band in which the sound emission capabilities of the
speaker units overlap. For example, if the sound output capability of the low-range speaker set
5L is 20 Hz to 250 Hz and the sound output capability of the mid-range speaker set 5 M is 200
Hz to 4 kHz, only the 200 Hz to 250 Hz band where the sound output capabilities overlap Make
compensation.
[0049]
As described above, by installing three speaker sets using speaker units having different
apertures, while securing the sound quality from low to high, the phase interference caused by
using speaker units having different apertures is phased It becomes possible to give directivity to
singing voice by suppressing by a compensation filter.
[0050]
In the present embodiment, the position of the microphone 2 is measured by the microphone
position detection unit 7 and beam control is performed according to the detected microphone
position. However, according to the present invention, the microphone position is detected
according to the microphone position. The configuration for performing beam control is not
essential.
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[0051]
It is a block diagram which shows the structure of a karaoke apparatus.
It is an external view of a speaker array.
It is a figure for demonstrating the formation principle of an audio | voice beam. It is a
conceptual diagram which shows a microphone position measurement. It is a figure explaining
beam control in the actual karaoke shop. It is the figure which showed the concept of phase
difference and phase compensation. It is the figure which showed the characteristic of the phase
difference compensation filter at the time of using a 2nd-order IIR filter.
Explanation of sign
[0052]
1-Karaoke device 2-Mike 3H, 3M, 3L-Driver amplifier 4- Signal processing unit 5H, 5M, 5LSpeaker set 6-ADC 7-Microphone position detection unit 8- Control unit 9-Accompaniment
reproduction unit 10-Storage unit
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