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JP2017092924

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DESCRIPTION JP2017092924
Abstract: A bass boost dual real surround 3D radio capable of moving a sound image by inclining
the direction of left and right sounds with a speaker unit at the center to switch a resonance
frequency by automatically detecting a natural heavy bass and switching a bass band. provide.
SOLUTION: Two speakers are provided at the upper and lower portions of a resonance
enhancement duct, and the solenoid network is controlled to open and close at a frequency
detected by a low band detection circuit and a high band detection circuit by a speaker network.
Listen to the movement of the sound image clearly by tilting the sound reflector by separating
the sound source of the microphone and applying voltage to the piezoelectric elements provided
on the left and right sound reflectors according to the level ratio with the left speaker or the level
ratio with the right speaker Make things possible. [Selected figure] Figure 1
Bass Boost Dual Real Surround 3D Radio
[0001]
The present invention relates to a bass boost dual real surround 3D radio that enables thin and
compact real surround sounding heavy bass.
[0002]
In the wave superposition, the waves of the same frequency have the property of doubling the
amplitude and quadrupling the energy when resonating due to the superposition of the waves
having the same frequency.
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1
Furthermore, when the sound waves generated in the space of the box with a large volume enter
the space of the box with a small volume, the amplification action of tube resonance acts to
enhance the bass. It is used for pulp organ and bass reflex type acoustic port.
[0003]
In the past, the principle of tube resonance was used to extend the bass in acoustic technology.
The relationship between the length of the air column and the frequency of resonance with the
speed of sound is given by the following equation.
[0004]
[0005]
Assuming that the length of the pipe is L, the speed of sound is V, and the natural frequency is fm
in Equations 1 and 2, it is understood that the resonant frequency is lower in the closed tube.
[0006]
With regard to sound pressure, it is understood from Boyle's Law that the smaller the volume of
the pressure is, the higher the volume is and the smaller the volume is.
By the way, Boyle-Charles's law designates the volume of the pressure P1 and the volume A as
V1, the volume B as V2, and the pressure as P2, as shown in Formula 3.
[0007]
In the speaker, which is an acoustic unit, the increase in magnetic flux is directly proportional to
the magnitude of the applied current and the cross-sectional area of the moving coil, and the selfinductance becomes large.
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2
It is known that the sound pressure of the low sound is extended by the size of the cross section
of the moving coil.
[0008]
The sound system has a virtual surround system and a real surround system. The virtual
surround system, which sounds as if the sound is spread out due to volume level difference, time
difference, phase difference, etc., has no sense of movement behind the left and right, and has a
stereoscopic effect in the forward direction. On the other hand, the real surround method has a
sense of sound field behind and to the left. There is a way to reflect on the wall at the moment.
[0009]
The sound reflectance changes the direction of the sound returned from the medium 2 when the
sound of the speaker is radiated to the medium 1. The angle at which the sound is reflected
changes with the angle at which the sound reflection plate rotates around the fulcrum of the
sound reflection plate.
[0010]
Conventionally, it is physically difficult to listen to a deep bass of about 20 Hz with a compact
small speaker. It also can not reproduce natural transparent sounds. When playing with three
speakers, the separation does not go well, and the sense of reality and the movement of sound
are not clear, so the sense of realism is lacking. The present invention is intended to solve the
above problems.
[0011]
A three-microphone sound source recording unit in which a central microphone using a
directional microphone and a left and right microphone are arranged between three points with
respect to the sound source mixes the central microphone sound with the left and right
microphone sound and multiplexes the central microphone (C sound source detection signal)
When the C source detection signal is detected by broadcasting by the signal transmission means
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3
and stereo broadcasting means and received by the FM stereo tuner and detected by the FM
multiplex signal detection, the pathlay connected to the FM stereo tuner is turned on (off when
not detected), 2nd Pass through the MPX circuit. On the other hand, the FM stereo tuner is
connected to the first MPX circuit, amplified by the stereo speaker amplifier, and stereo sound is
output by the left speaker and the right speaker.
[0012]
When a signal in which an antiphase conversion circuit is connected to the left channel
component of the first MPX circuit and the output of the left channel of the second MPX circuit
is simultaneously input to the third processor and subjected to an addition operation, a C sound
source is generated. This output is D output. The D output is amplified by the center speaker
amplifier and connected to the bass boost dual speaker unit.
[0013]
When the right channel component of the first MPX circuit and the right channel of the second
MPX circuit are input to the fourth processor, this output is an M output. The output calculated
from the fifth processor with the D output and the left channel output of the first MPX circuit is
applied to a piezoelectric element attached to a sound reflecting plate which is rotated about the
fulcrum and inclined to the left speaker. Similarly, the right channel output and the M output of
the first processor are added to the piezoelectric element in the right speaker, and the inclination
is calculated by the sixth processor to the aforementioned piezoelectric element. Bass boost dual
real surround 3D radio with the above configuration.
[0014]
Reinforcement ducts extend the length of the tube related to the frequency of the tube
resonance, the effect of the screw acoustic ducts of the acoustic air coil part corresponds more to
bass, two woofer speakers resonate in the resonance boost ducts The acoustic energy is
increased by opposing arrangement of the upper and lower sides of the The low sound area
detection circuit and the high sound area detection circuit switch between the closed pipe state
and the open pipe state by opening and closing the solenoid valve, and by providing a resonance
intensifying horn whose resonance frequency is changed, deep bass reproduction is realized. The
degree of inclination of the sound reflection plate facing the left and right speakers is calculated
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by the calculation of the processor, and added to the piezoelectric element provided with the
sound reflection plate, thereby enabling realistic bass reproduction.
[0015]
The whole block diagram of the present invention The circuit diagram of the range network of
the present invention The figure showing the change of the frequency at the time of opening and
closing of the electromagnetic valve of the present invention The detailed view of the acoustic air
coil part of the present invention Diagram of 3D surround radio transmission and reception
Sound deflection control diagram of the sound reflector Plate configuration diagram of the whole
speaker Detail diagram of the sound deflection unit of the present invention
[0016]
Hereinafter, embodiments of the present invention will be described.
When an audio signal enters the input terminal (1), the signal enters the range network control
chip (3) connected to the speaker network (2). A speaker network (2) is connected to a first
woofer speaker (4), a second woofer speaker (5) and a tweeter (8).
[0017]
The tweeter (8) is joined to the speaker net (9), and the aperture portion of the first woofer
speaker (4) and the second woofer speaker (5) is joined to the inner tube portion of the
resonance enhancement duct (7) There is. Further, a solenoid valve (11) is provided at the rear of
the resonance enhancement duct (7).
[0018]
The high range network control chip (3) is connected to the high range detection circuit (13) and
the first encoding circuit (14), the low range detection circuit (15) is connected to the second
encoding circuit (16), and the speaker network (2) The high frequency range detection circuit
(13) detects a relatively high frequency range in the low frequency range and the low frequency
range detection circuit (15) detects a high frequency range sound.
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[0020]
The first encoding circuit (14) and the second encoding circuit (16) are set with different digital
numerical values.
Input along with the first processor (17). The first processor (17) opens and closes the
conversion solenoid valve (11) to a signal of "1" or "0" by the first DAC (18).
[0021]
When the solenoid valve (11) is opened, the resonance enhancement duct (7) becomes open and
the resonance frequency increases. That is, when the high-pitched area detection circuit (13)
detects a high-pitched sound, the first processor (17) instructs the solenoid valve (11) to open to
output "1".
[0022]
The sound pressure of the two low-pitched sounds from the first and second woofer speakers (4)
and (5) is overlapped by the sound pressure of the two low-pitched sounds from the resonance
enhancement duct (7) and the resonance enhanced horn (6 Sound comes out of the speaker net
(9) with the sound of the tweeter (8) through).
[0023]
Since the resonance frequency decreases in direct proportion to the length of the tube resonance,
a screw acoustic duct (23) is provided in the acoustic air coil portion (22) for lower range sound
reproduction, and the solenoid valve (11) of the resonance enhancement duct (7) The sound is
emitted from the resonance bass outlet (25) on the side of the resonance enhanced horn (6) by
being joined to the resonance bass intake port (24) on the side) and from the B through the
uptake C.
[0024]
When the solenoid valve (11) is open, a good acoustic space is obtained from the air open circuit
port (12) and the port at the central portion of the speaker mounting reinforcement (10).
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The speaker mounting reinforcement (10) is used to fix the speaker from two places.
In the reproduction display of deep bass, the "0" output terminal of the first DAC (18) is
connected to the red LED (19). The blue LED (20) is connected to the "1" output terminal.
[0025]
A treble band detection circuit (13) of about 40 Hz is detected by the output electric signal, and a
bass band detection circuit (15) of about 20 Hz is detected, and the red bass (20) is turned on by
the red LED (19) Do.
[0026]
As shown in FIG. 3, for application to 3D surround radio, the stereo sound source is captured by
the center microphone (26), the left microphone (27) and the right microphone (28) in the three
microphone sound source recording unit (29).
The center microphone (26) is placed at the center of the sound source, and the left microphone
(27) and the right microphone (28) are placed at the left and right positions.
[0027]
Connected from the live sound source automatic switching means (37), the FM stereo tuner (35)
is connected to the input side of the path relay (38), and the path relay (38) is connected to the
second MPX circuit (39). When the C sound source is sensed from the FM multiplex signal
detection (36) connected to the FM stereo tuner (35), the path relay (38) is turned on or off
depending on the presence or absence of the C sound source detection signal (33). When on,
enters the second MPX circuit (39). When it is off, it is not input to the second MPX circuit (39).
[0028]
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At the same time, it is input from the FM stereo tuner (35) to the first MPX circuit (40). The left
and right microphone signals are output. Since the output of the second MPX circuit (39) detects
the C sound source from the central microphone (26) and the path relay (38) is input to the
second MPX circuit (39), this output includes the C sound source It is a signal.
[0029]
A connection antiphase conversion circuit (41) is connected to the left channel output and the
right channel output of the second MPX circuit (39). The coupled anti-phase conversion circuit
(41) is formed of modules in parallel in which two anti-phase conversion circuits are not
connected. The left microphone component of the second MPX circuit (39) and the left channel
output of the first MPX circuit (40) are input to the third processor (42). The third processor (42)
performs an addition operation. This output is D output (51). The right microphone component
of the second MPX circuit (39) and the right channel output of the first MPX circuit (40) are
input to the fourth processor (43). The fourth processor (43) performs an addition operation.
This operation output is M output (53).
[0030]
The left channel output and right channel output of the first MPX circuit (40) are amplified by
the stereo speaker amplifier (46), and stereo sound can be heard from the left and right by the
left speaker (47) and the right speaker (48).
[0031]
The D output (51) or the M output (53) is amplified by the center speaker amplifier (44) to
output the output bass to the bass boost dual speaker unit (45).
3 In the microphone sound source recording unit (29), when the sound source moves to the
central microphone (26), the sound level entering the central microphone (26) and the sound
level of the left microphone (27) gradually enter the central microphone (26) Level is greater.
That is, by changing the position of the moving sound source according to the ratio of the sound
level of the left speaker (47) and the level of the C sound source on the reproduction side, it is
possible to change the reflection angle of the sound and change the listening direction. In other
words, real surround that is not virtual surround can be reproduced.
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[0032]
FIG. 10 shows a portion for performing sound deflection. The sound deflection unit (62) gives the
sound of the left speaker (47) and the right speaker (48) an inclination in the traveling direction
of the sound necessary for 3D surround. Attach the first piezoelectric element (50) to one of the
sound reflection plate (left) (49), and attach the other of the sound reflection plate (left) (49) to
the left reflection speaker cover (63) and the fulcrum (61) . Similarly, the sound reflection plate
(right) (57) is provided on the second piezoelectric element (58), the fulcrum (61) and the sound
reflection plate (right) (57) are attached, and the right reflection speaker cover portion (64) wear.
Place two curved reflectors (65) in the opposite arrangement of the left speaker (47) and the
right speaker (48). Assuming that the left channel output of the first MPX circuit (40) is D1, the D
output (51) is input to the fifth processor (52). The fifth processor (52) calculates D output (51)
divided by D1 output. Assuming that the right channel output of the first MPX circuit (40) is M1,
the M output (53) is added to the sixth processor (54) to calculate M output (53) divided by M1
output. Both use the division algorithm.
[0033]
The sound reflector (left) (49) is centered on the fulcrum (61) by adding it to the first
piezoelectric element (50) amplified by the second DAC (57) and the first operational amplifier
(56) in the fifth processor (52) Tilt to make the sound move to the center side. Similarly, when
the third DAC (59) and the second operational amplifier (60) are added to the second
piezoelectric element (58) in the sixth processor (54), the sound reflector (right) (57) has a sound
toward the center Tilt to move.
[0034]
The sound reflector (left) (49) is disposed to face the aperture of the left speaker (47), and the
sound reflector (right) (57) is disposed to face the aperture of the right speaker (48) .
[0035]
In the sound source moving to the center by the movement of the sound image, the sound
reflecting plate (left) (49) of the left speaker (47) moves little by little toward the center and can
be heard.
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The above is the configuration of the present invention.
[0036]
Reference Signs List 1 input terminal 2 speaker network 3 range network control chip 4 first
woofer speaker 5 second woofer speaker 6 resonance intensifying horn 7 resonance intensifying
duct 8 tweeter 9 speaker net 10 speaker mounting reinforcement 11 electromagnetic valve 12
air open port 13 high Range detection circuit 14 First encoding circuit 15 Bass range detection
circuit 16 Second encoding circuit 17 First processor 18 First DAC 19 Red LED 20 Blue LED 21
Power supply circuit 22 Acoustic air coil section 23 Screw acoustic duct 24 Resonance bass
intake port 25 Resonance bass emission Exit 26 Central microphone (directional microphone) 27
Left microphone 28 Right microphone 29 3 Microphone sound source recording unit 30 Digital
conversion circuit 31 Second processor 32 Multiple data transmission means 33 C sound source
detection signal 34 Stereo broadcasting means 35 FM station O-tuner 36 FM multiplex signal
detection 37 live sound source automatic switching means 38 path relay 39 second MPX circuit
40 first MPX circuit 41 coupled reverse phase conversion circuit 42 third processor 43 fourth
processor 44 center speaker amplifier 45 bass boost dual speaker unit 46 stereo speaker unit 47
left speaker 48 right speaker 49 sound reflector (left) 50 first piezoelectric element 51 D output
52 fifth processor 53 M output 54 sixth processor 55 second DAC 56 first operational amplifier
57 sound reflector (right ) 58 second piezoelectric element 59 third DAC 60 second operational
amplifier 61 fulcrum 62 sound deflection part 63 left reflection speaker cover part 64 right
reflection speaker cover part 65 bent sound reflector
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