JP6182762B2 - Bass Boost Dual Real Surround 3D Radio - Google Patents

Description

  The present invention relates to a bass boost dual real surround 3D radio that enables a real surround sounding a heavy bass even though it is thin and compact.

  When the waves of the same frequency overlap in the superposition of the waves, the resonance has the property that the amplitude is doubled and the energy is quadrupled. Furthermore, when the sound wave generated in the space of the box with a large volume enters the space of the box with a small volume, an amplifying action called tube resonance works to enhance the bass. It is used for pulp organ and bass reflex acoustic ports.

  Traditionally, the principle of tube resonance has been used to extend bass in acoustic technology. The relationship between the length of the air column and the frequency of resonance with the speed of sound is expressed by the following equation.

  In Equations 1 and 2, if the tube length is L, the sound velocity is V, and the natural frequency is fm, it can be seen that the closed tube has a lower resonance frequency.

  Regarding the sound pressure, it can be seen from Boyle Charles' law that the smaller the volume, the higher the pressure. By the way, the Boyle Charles' law is that the pressure P1, the volume A is V1, the volume B is V2, and the pressure is P2, as shown in Equation 3.

  In a loudspeaker as an acoustic unit, the increase in magnetic flux is directly proportional to the magnitude of the applied current and the sectional area of the moving coil, and the self-inductance increases. It is known that the sound pressure of the bass increases with the size of the sectional area of the moving coil.

  There are two types of sound systems: a virtual surround system and a real surround system. The virtual surround system that can be heard to expand the sound by volume level difference, time difference, phase difference, etc. has a sense of forward three-dimensionality without moving left and right behind. In contrast, the real surround system has a sense of sound field on the left and right. There is a way to reflect on the wall at the moment.

  The sound reflectivity changes the direction of sound returned by the medium 2 when the sound of the speaker is radiated to the medium 1. The angle at which the sound is reflected varies depending on the angle at which the sound reflector rotates about the fulcrum of the sound reflector.

Conventionally, it is physically difficult to listen to a heavy bass of about 20 Hz with a compact small speaker. Natural transparent sound reproduction is not possible. When playback is performed with three speakers, the realism is lacking because separation is not successful and the sense of presence and sound movement are not clear.
The present invention is intended to solve the above problems.

  A three-microphone sound source recording unit in which a central microphone using a directional microphone and left and right microphones are arranged between three points with respect to a sound source mixes the central microphone sound with the left and right microphone sounds and multiplexes the central microphone (C sound source detection signal). Broadcast by signal sending means and stereo broadcast means, received by FM stereo tuner, and when C sound source detection signal is detected by FM multiplex signal detection, the pathlay connected to FM stereo tuner is on (if not detected, off), second Through the MPX circuit. On the other hand, the FM stereo tuner is connected to the first MPX circuit, amplified by a stereo speaker amplifier, and stereo sound is output from the left speaker and the right speaker.

When a signal obtained by connecting an antiphase conversion circuit 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 added, a C sound source is produced.
This output is defined as D output. Amplify D output with center speaker amplifier and connect to bass boost dual speaker unit.

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 set to M output. The output obtained by calculating the D output and the left channel output of the first MPX circuit by the fifth processor is applied to the piezoelectric element attached to the sound reflector that rotates about the fulcrum and tilts 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 by the calculation for calculating the inclination by the sixth processor.
The bass boost dual real surround 3D radio of the above composition.

The resonance-enhanced duct extends the length of the tube related to the frequency of tube resonance, and the effect of the screw acoustic duct of the acoustic air coil unit supports the lower sound range, and two woofer speakers are connected to the resonance-enhanced duct as the resonance tube. The acoustic energy is increased by disposing them opposite to each other.
The bass sound detection circuit and the treble sound detection circuit are switched between a closed tube state and an open tube state by opening and closing the electromagnetic valve, and a resonance enhancing horn with a changed resonance frequency is provided to realize heavy bass reproduction.
By calculating the degree of inclination of the sound reflector facing the left and right speakers by the calculation of the processor and adding it to the piezoelectric element provided with the sound reflector, it is possible to reproduce a deep bass sound with a sense of presence.

Overall configuration diagram of the present invention Circuit diagram of the range network of the present invention The figure which shows the change of the frequency at the time of opening and closing of the solenoid valve of this invention Detailed view of acoustic air coil section of the present invention Sectional view of FIG. Figure of 3 microphone sound source recording part Configuration diagram of 3D surround radio transmission / reception Sound deflection control diagram of sound reflector Configuration diagram of the entire speaker Detailed view of the sound deflection unit of the present invention

Hereinafter, embodiments of the present invention will be described.
When the audio signal enters the input terminal (1), the signal enters the sound range network control chip (3) connected to the speaker network (2).
The speaker network (2) is connected to the first woofer speaker (4), the second woofer speaker (5), and the tweeter (8).

  The tweeter (8) is joined to the speaker net (9), and the caliber portions of the first woofer speaker (4) and the second woofer speaker (5) are joined to the tube portion inside the resonance enhancing duct (7). Yes. Further, an electromagnetic valve (11) is provided behind the resonance enhancing duct (7).

  The sound range network control chip (3) is connected to the high sound range detection circuit (13) and the first encoding circuit (14), and the low sound range detection circuit (15) is connected to the second encoding circuit (16) to connect the speaker network (2). From the low to high range, a relatively high range is detected by a high range detection circuit (13), and a deep low range is detected by a low range detection circuit (15).

  Different digital numerical values are set for the first encoding circuit (14) and the second encoding circuit (16). Input with the first processor (17). The first processor (17) opens and closes the conversion electromagnetic valve (11) with a signal of “1” or “0” by the first DAC (18).

  When the solenoid valve (11) is opened, the resonance enhancing duct (7) is in an open tube state and the resonance frequency is increased. That is, when the high sound range detection circuit (13) detects a high sound, the first processor (17) commands to output “1” to open the solenoid valve (11).

  The low-frequency sound from the first woofer speaker (4) and the second woofer speaker (5) is overlapped by two sound pressures, and the low-frequency sound is increased from the resonance enhancement duct (7) to the resonance enhancement horn (6 ) And the sound of the tweeter (8) through the speaker network (9).

  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 section (22) for lower-frequency sound reproduction, and the electromagnetic valve (11 of the resonance enhancement duct (7) is provided. ) Side is joined to a certain resonance bass intake port (24), passes through B through C, and sounds are emitted from the resonance bass horn (6) side resonance bass emission port (25).

When the solenoid valve (11) is opened, an acoustic space with a good clearance from the air opening port (12) and the central port of the speaker mounting reinforcement (10) is formed. The speaker mounting reinforcement (10) is used to fix the speaker from two places.
In the reproduction display of heavy bass, the “0” output terminal of the first DAC (18) is connected to the red LED (19). A blue LED (20) is connected to the “1” output terminal.

  The high frequency range detection circuit (13) of about 40 Hz is detected by the output electrical signal, the low range detection circuit (15) is detected at about 20 Hz, and the red LED (19) is lit for heavy bass of about 20 Hz. To do.

  As shown in FIG. 3, in order to apply to 3D surround radio, a stereo sound source is captured by a center microphone (26), a left microphone (27), and a right microphone (28) by a three-microphone sound source recording unit (29). The central microphone (26) is installed in the center with respect to the sound source, and the left microphone (27) and the right microphone (28) are installed at the left and right positions.

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 senses from the FM multiple signal detection (36) connected to the FM stereo tuner (35), the path relay (38) is turned on / off depending on the presence or absence of the C sound source detection signal (33). When on, the second MPX circuit (39) is entered. When it is off, it is not input to the second MPX circuit (39).

  At the same time, the signal is input from the FM stereo tuner (35) to the first MPX circuit (40). Left microphone signal and right microphone signal are output. The output of the second MPX circuit (39) detects the C sound source from the central microphone (26), and when the path relay (38) is turned on, it is input to the second MPX circuit (39), so this output includes the C sound source. Signal.

A connected anti-phase conversion circuit (41) is connected to the left channel output and the right channel output of the second MPX circuit (39). This connected anti-phase conversion circuit (41) is composed 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 defined as 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 calculation output is referred to as M output (53).

  The left channel output and the right channel output of the first MPX circuit (40) are amplified by the stereo speaker amplifier (46), and the stereo sound can be heard from the left and right by the left speaker (47) and the right speaker (48).

  The D output (51) or the M output (53) is amplified by the center speaker amplifier (44), and an output heavy bass is output to the bass boost dual speaker unit (45). In the three-microphone sound source recording unit (29), when the sound source has moved to the central microphone (26), the sound level entering the central microphone (26) and the sound level of the left microphone (27) are gradually entering the central microphone (26). The level of becomes larger. 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 playback side, the direction of sound can be changed by changing the sound reflection angle. In other words, real surround sound that is not virtual surround sound can be reproduced.

FIG. 10 shows a portion that performs sound deflection, and the sound deflection unit (62) gives the sound of the traveling direction of the sound necessary for 3D surround to the sound of the left speaker (47) and the right speaker (48).
The first piezoelectric element (50) is attached to one of the sound reflectors (left) and (49), and the left reflector speaker cover (63) and the fulcrum (61) are attached to the other one of the sound reflectors (left) and (49). .
Similarly, the second piezoelectric element (58) is provided on the sound reflector (right) (57), the fulcrum (61) and the sound reflector (right) (57) are attached, and the right reflector speaker cover (64) is attached. wear. Two curved reflectors (65) are placed with the left speaker (47) and the right speaker (48) facing each other.
When 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 D1 output divided by D output (51).
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 the M1 output divided by the M output (53). Both use division algorithm.

  By adding the second DAC (57) and the first operational amplifier (56) to the amplified first piezoelectric element (50) to the fifth processor (52), the sound reflector (left) (49) is centered on the fulcrum (61). Inclined to move the sound toward the center. Similarly, when the sixth processor (54) is added to the second piezoelectric element (58) by the third DAC (59) and the second operational amplifier (60), the sound reflector (right) (57) emits sound toward the center. Tilt to move.

  The sound reflector (left) (49) is arranged to face the aperture of the left speaker (47), and the sound reflector (right) (57) is arranged to face the aperture of the right speaker (48). .

In the sound source that moves to the center by the movement of the sound image, the sound reflector (left) (49) of the left speaker (47) can be heard moving little by little toward the center.
The above is the configuration of the present invention.

DESCRIPTION OF SYMBOLS 1 Input terminal 2 Speaker network 3 Sound network control chip 4 1st Woofer speaker 5 2nd Woofer speaker 6 Resonance enhancement horn 7 Resonance enhancement duct 8 Tweeter 9 Speaker network 10 Speaker attachment reinforcement 11 Electromagnetic valve 12 Air opening port 13 High Sound region detection circuit 14 First encoding circuit 15 Low sound region 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 Resonant bass intake 25 Resonant bass outlet 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 multiplexed data transmission means 33 C sound source detection signal 34 stereo broadcast means 35 FM stereo tuner 36 FM multiple signal detection 37 live sound source automatic switching means 38 Path relay 39 Second MPX circuit 40 First MPX circuit 41 Concatenated anti-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 reflection Board (left)
50 1st piezoelectric element 51 D output 52 5th processor 53 M output 54 6th processor 55 2nd 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 folding sound reflector

Claims (3)

The output signal of the central microphone (directional microphone) sound source is input to the stereo broadcasting means together with the output of the left microphone and the right microphone, while the C sound source detection signal from the second processor via the digital conversion circuit from the central microphone to the multiplexed data broadcasting means. In addition, when the radio broadcasting station side broadcasts with a three-microphone sound source in a stereo broadcasting means, a live sound source switching means for outputting a left channel and a right channel with the first MPX circuit with an FM stereo tuner and detecting a C sound source by detecting FM multiple signals and switching on and off at Pasurire, If on, outputs the left and right channels including a C source in the second MPX circuit, after detecting the signal of C source separated by the third processor, the input to the center speaker amplifier, stereo speaker amplifier with sound the bass in bass boost dual speaker unit Bass boost dual real surround 3D radio, characterized in that the output sound from the left speaker and the right speaker through. When the C sound source signal is input from the input terminal in the low frequency range of the speaker network, the detection signal of the heavy low frequency range is input to the first processor via the low frequency range detection circuit for detecting the heavy bass sound and the second encoding circuit. The high-frequency range detection circuit and the first encoding circuit input a high-frequency range detection signal to the first processor through the DAC and the first woofer with the electromagnetic valve open. A speaker and a second woofer speaker are installed above and below the tube in the resonance enhancement duct, one of which is a resonance enhancement horn and a tweeter on the front speaker net, an electromagnetic valve in the opposite direction, and a resonance bass on the resonance enhancement duct side. acoustic Airco the acoustic screw acoustic duct and the intake provided resonance bass outlet resonance enhanced horn side wound into a coil on the outer periphery of the resonance enhancement ductwork Bass boost real surround 3D radio of claim 1, wherein the provision of the bass boost dual speaker unit disposed Le portion in the center of the body. A piezoelectric element is attached to a sound reflector arranged so as to face the left speaker and the right speaker, and one of the sound reflectors is rotated as a fulcrum, and both the C sound source and the D output of the third processor are sent to the fifth processor. The M output of the fourth processor is input to the sixth processor, the output of each voltage ratio is input to the corresponding operational amplifier, and the amplified output is applied to the piezoelectric elements provided on the left and right sound reflectors. Boost dual real surround 3D radio.

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