CN216086991U - Strong sound directional sound wave instrument - Google Patents

Abstract

The utility model discloses a strong sound directional sound wave instrument, which comprises: the loudspeaker comprises a shell, a power amplifier control unit and a loudspeaker, wherein an audio input interface is arranged on the shell; the loudspeaker comprises a horn, a reflecting cover and a transducer, wherein the horn is installed at one end of the casing, the reflecting cover is installed in the horn and located on the central axis of the horn, the transducer is installed in the reflecting cover, the curvature radius of the front end face of the reflecting cover is the same as that of a vibrating diaphragm of the transducer, and the caliber of the horn is gradually increased from inside to outside. The arc-shaped horn can realize directional sending of sound waves, the curvature radius of the front end face of the reflecting cover is the same as that of the transducer vibrating diaphragm, so that the distances from all parts of the transducer vibrating diaphragm to the throat part of the horn are the same, the sound waves reaching the throat part of the horn are in the same phase, distortion is reduced, and the requirement of directionally sending strong sound waves is met.

Description

Strong sound directional sound wave instrument

Technical Field

The utility model relates to the field of sound production equipment, in particular to a strong sound directional sound wave instrument.

Background

The research of high-power directional sound sources has become a hot spot recently concerned at home and abroad, and the directional sound sources have important application values in civil and military fields. The sound source as a new concept, the sound wave directional emission technology, is still in the initial stage of research in the world, and the related theory and products thereof have many defects.

The existing sound wave instrument produces sound through a loudspeaker, the electroacoustic conversion efficiency of the radiation type loudspeaker which is exposed is low, the directional sending of the sound wave cannot be realized, and the directional sending of the sound wave can be realized by adopting a horn type loudspeaker, but the problem of distortion exists.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a strong sound directional sound wave instrument which can solve the problems that sound waves cannot be directionally transmitted and are distorted.

According to the embodiment of the utility model, the strong sound directional acoustic wave instrument comprises: the audio input device comprises a shell, a voice input interface and a voice output interface, wherein the shell is provided with the audio input interface; the power amplifier control unit is arranged in the shell, and the input end of the power amplifier control unit is connected with the audio input interface; the loudspeaker comprises a horn, a reflecting cover and a transducer, the output end of the power amplifier control unit is connected with the transducer, the horn is installed at one end of the casing, the reflecting cover is installed in the horn and located on the central axis of the horn, the transducer is installed in the reflecting cover, the curvature radius of the front end face of the reflecting cover is the same as that of a vibrating diaphragm of the transducer, and the caliber of the horn is gradually increased from inside to outside.

The strong sound directional acoustic wave instrument according to the embodiment of the utility model at least has the following technical effects: according to the embodiment of the utility model, an original audio signal is input through the audio input interface, the audio signal is amplified through the power amplifier control unit, and the audio signal is converted into sound waves through the transducer in the loudspeaker to be emitted. The arc-shaped horn can realize directional sending of sound waves, the curvature radius of the front end face of the reflecting cover is the same as that of the transducer vibrating diaphragm, so that the distances from all parts of the transducer vibrating diaphragm to the throat part of the horn are the same, the sound waves reaching the throat part of the horn are in the same phase, distortion is reduced, and the requirement of directionally sending strong sound waves is met.

According to some embodiments of the present invention, the audio input interface includes an AUX interface and an MIC interface, and the AUX interface and the MIC interface are respectively connected to the power amplifier control unit.

According to some embodiments of the present invention, a howling suppressor is disposed between the MIC interface and the power amplifier control unit.

According to some embodiments of the present invention, a sound recorder, an audio decoder, an MCU, and a memory are further disposed in the casing, an input end of the sound recorder is connected to the MIC interface, an output end of the sound recorder is connected to a signal input end of the MCU, the MCU is connected to the memory for storing sound data, a signal output end of the MCU is connected to an input end of the audio decoder, and an output end of the audio decoder is connected to the power amplifier control unit.

According to some embodiments of the utility model, the casing is a rectangular parallelepiped structure, and a handle is provided on the top of the casing.

According to some embodiments of the present invention, the power amplifier control unit includes a CPU, a signal processing unit, an analog switch, and a power amplifier unit; the audio input interface is connected with the input end of the signal processing unit, the output end of the signal processing unit is connected with the input end of the analog switch, the output end of the analog switch is connected with the input end of the power amplification unit, the CPU is connected with the control end of the power amplification unit so as to control the amplification factor, and the output end of the power amplification unit is connected with the loudspeaker.

According to some embodiments of the present invention, the signal processing unit includes an automatic gain adjusting circuit and a clipping muting circuit, the audio input interface is connected to an input of the automatic gain adjusting circuit, an output of the automatic gain adjusting circuit is connected to an input of the clipping muting circuit, and an output of the clipping muting circuit is connected to an input of the analog switch.

According to some embodiments of the present invention, a volume adjusting circuit is further disposed between the analog switch and the power amplifier unit, and the CPU is connected to a control terminal of the volume adjusting circuit.

According to some embodiments of the present invention, an FM frequency modulation module is further disposed in the casing, and the FM frequency modulation module is connected to an input end of the power amplifier control unit.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a cross-sectional view of a speaker in an embodiment of the present invention;

FIG. 2 is a schematic block diagram of an acoustic megasonic apparatus in accordance with an embodiment of the present invention;

FIG. 3 is a schematic circuit diagram of an automatic gain adjustment circuit according to an embodiment of the present invention;

fig. 4 is a circuit diagram of a clipping and muting circuit in an embodiment of the present invention.

Reference numerals

Horn 100, bowl 200, transducer 300, howling suppressor 400, recorder 510, audio decoder 520, MCU530, memory 540, CPU610, signal processing unit 620, analog switch 630, power amplifier unit 640, volume adjustment circuit 650, FM module 700.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1, a megasonic directional sonicator comprising: the loudspeaker comprises a shell, a power amplifier control unit and a loudspeaker, wherein an audio input interface is arranged at the tail end of the shell, and the power amplifier control unit is arranged in the shell and is used for amplifying an audio signal and then driving the loudspeaker to perform electroacoustic conversion to generate sound waves to emit the sound waves.

The loudspeaker comprises a horn 100, a reflecting cover 200 and a transducer 300, the output end of a power amplifier control unit is connected with the transducer 300, the horn 100 is installed at one end of a casing, the reflecting cover 200 is installed in the horn 100 and is located on the central axis of the horn 100, the transducer 300 is installed in the reflecting cover 200, the curvature radius of the front end face of the reflecting cover 200 is the same as that of a vibrating diaphragm of the transducer 300, and the caliber of the horn 100 is gradually increased from inside to outside to form an arc-shaped horn structure. The reason why the sound wave emitted from the horn speaker is distorted is that the air flow generated by the sound wave generates frictional loss at the sound radiation port and the inner wall of the throat of the horn, thereby generating eddy distortion. When the acoustic wave has a short wavelength at high frequency, the acoustic waves generated at different positions on the diaphragm surface of the transducer 300 will cancel each other out due to different phases when they are transmitted to the throat of the reflection housing 200 through different distances. Therefore, in the present embodiment, the front end surface of the reflection housing 200 is hemispherical and has the same radius of curvature as that of the diaphragm of the transducer 300, so that the distances from the parts of the diaphragm to the throat of the horn 100 are substantially equal, the acoustic path difference is smaller than λ/4 of the highest frequency, and the sound waves reaching the throat are in the same phase, thereby reducing distortion.

The casing is the cuboid structure in this embodiment, makes horn 100 along vertical degree of depth extension, causes the acoustic pressure vortex, is favorable to the directional propagation of sound, and the top of casing is provided with the handle, conveniently carries.

Referring to fig. 2, the audio input interface includes an AUX interface and an MIC interface, the AUX interface is connected to an audio playing device, the MIC interface is connected to a microphone, a recorder 510, an audio decoder 520, an MCU530, and a memory 540 are further disposed in the casing, the power amplifier control unit includes a CPU610, a signal processing unit 620, an analog switch 630, and a power amplifier unit 640, the MIC interface is connected to the howling suppressor 400, and prevents howling caused by overhigh sound, an output end of the howling suppressor 400 is connected to the recorder 510 on the one hand, the recorder 510 stores sound information into the memory 540 through the MCU530, and when playing, the sound is decoded by the audio decoder 520 and played, in this embodiment, the memory 540 employs a built-in SD card, which can store both a recording file and audio files in MP3 and WAV formats such as music. On the other hand, the output end of the howling suppressor 400 is directly connected to the analog switch 630 of the power amplifier control unit, and directly outputs sound after power amplification.

In this embodiment, the analog switch 630 is a multi-channel analog switch chip, the memory 540 is connected to the first input end of the multi-channel analog switch chip through the MCU530, the audio decoder 520 and the signal processing unit 620, the MIC interface is directly connected to the second input end through the howling suppressor 400, and the AUX interface is directly connected to the third input end, in order to improve functionality, the casing is further provided with the FM modulation module 700, the FM modulation module 700 is connected to the fourth input end of the multi-channel analog switch chip through the signal processing unit 620, and the CPU610 is connected to the control end of the multi-channel analog switch chip to realize switching of different sound source inputs.

The output end of the analog switch 630 is connected with a volume adjusting circuit 650, the volume adjusting circuit 650 is connected with the power amplifier unit 640, the CPU610 is connected with the control end of the power amplifier unit 640 through a power amplifier power supply so as to control the amplification factor, and the CPU610 is connected with the control end of the volume adjusting circuit 650 so as to adjust the volume output by the loudspeaker. In order to improve portability, a lithium battery is arranged in the shell and can work without being connected with an external power supply, and the lithium battery is connected with the CPU610 through a battery voltage detection circuit.

The signal processing unit 620 is used for processing audio signals and avoiding the problems of sound breaking, noise and the like of sound waves emitted by the loudspeaker, the signal processing unit 620 comprises an automatic gain adjusting circuit and an amplitude limiting mute circuit, an audio input interface is connected with the input end of the automatic gain adjusting circuit, the output end of the automatic gain adjusting circuit is connected with the input end of the amplitude limiting mute circuit, and the output end of the amplitude limiting mute circuit is connected with the input end of the analog switch 630.

Referring to fig. 3, the automatic gain adjustment circuit includes an Input interface Input1, a gain adjustment chip U7, a transistor Q3, and an Output interface Output1, where the Input interface Input1 is connected to the audio decoder 520 or the FM module 700 to Input an original audio signal, the Input1 interface is connected to an Input pin VINP of the gain adjustment chip U7 through a resistor R41 and a capacitor C46 connected in series in sequence, an Output pin VOUT of the gain adjustment chip U7 is connected to the Output interface Output1 through a capacitor C44, the Output interface Output1 is connected to an Input end of the clipping muting circuit, an Output pin VOUT of the gain adjustment chip U7 is connected to a base of the transistor Q3 through a capacitor C44 and a capacitor C45 connected in series in sequence, a collector of the transistor Q3 is connected to a gain control Input pin GPOS of the gain adjustment chip U7, and a collector of the transistor Q3 is connected to a gain control Input pin GENG of the gain adjustment chip U7 through a resistor R35 and a resistor R36 connected in series in sequence. The output terminal VOUT of the gain-adjusting chip U7 is connected to the feedback terminal FDBK of the gain-adjusting chip U7. The negative power supply input pin VNEG of the gain adjusting chip U7 is connected with a power supply end of-5V through a resistor R47, the negative power supply input pin VNEG of the gain adjusting chip U7 is grounded through a capacitor C40 and a capacitor C50 which are mutually connected in parallel, and the emitter of the triode Q3 is grounded through a capacitor R46, a capacitor C40 and a capacitor C50 which are mutually connected in parallel.

The basic principle of the automatic gain adjusting circuit is to generate a correspondingly changing dc voltage, i.e., AGC voltage, with the amplitude of the input signal, and use the voltage to control the amplification factor of the gain adjusting chip U7. When the amplitude of the input signal is larger, the amplification factor of the AGC voltage control gain adjustment chip U7 is reduced; the amplification of the AGC voltage control gain adjustment chip U7 increases when the input signal amplitude is small. Obviously, the automatic gain control can achieve the purpose that the amplitude of the output signal is basically stable. The model of the gain adjusting chip U7 in this embodiment is AD603, and the purpose of changing the output gain is achieved by changing the pressure difference between the GPOS and ging pins of the AD 603.

Referring to fig. 4, the amplitude limiting and noise suppressing circuit includes an Input interface Input2, a dual-path analog switch chip U14, a half-wave rectifier circuit, a filter circuit, a comparator circuit, and an Output interface Output2, the Output interface Output1 of the automatic gain adjusting circuit is connected to the Input interface Input2, the Input interface Input2 is connected to a resistor R108, the resistor R108 is respectively connected to a pin SA of the dual-path analog switch chip U14 and an Input end of the half-wave rectifier circuit, an Output end of the half-wave rectifier circuit is connected to an Input end of the comparator circuit through the filter circuit, an Output end of the comparator circuit is connected to a pin IN of the dual-path analog switch chip U14, a pin D of the dual-path analog switch chip U14 is connected to the Output interface Output2, a corresponding port of the analog switch 630 is connected through the Output interface Output2, a pin SB of the dual-path analog switch chip U14 is grounded, and a pin SB of the dual-path analog switch chip U14 is connected to the pin IN through a capacitor C99.

The half-wave rectification circuit comprises an operational amplifier U12A, an operational amplifier U12B, a diode D4, a resistor R89 and a resistor R90; in this embodiment, an operational amplifier U12A and an operational amplifier U12B adopt a precision dual-channel operational amplifier with the model number of AD8676, an output end of an automatic gain adjusting circuit is connected with a non-inverting input end of the operational amplifier U12A through a resistor R98, an output end of the automatic gain adjusting circuit is connected with a non-inverting input end of the operational amplifier U12B through a resistor R102, an inverting input end of the operational amplifier U12A is grounded through a resistor R89, an output end of the operational amplifier U12A is connected with a cathode of a diode D4, an anode of the diode D4 is connected with an inverting input end of the operational amplifier U12B through a resistor R97, an inverting input end of the operational amplifier U12B is grounded through a resistor R97, a resistor R90 and a resistor R89 which are connected in series in sequence, and an output end of the operational amplifier U12B is connected with an input end of a comparator circuit through a filter circuit.

Wherein, the comparator circuit includes a comparator U3A, a comparator U3B, a triode Q4, a triode Q5, a diode D3 and a diode D5, in this embodiment, the comparator U3A and the comparator U3B adopt a low-power consumption dual-voltage comparator with model number LM193, the output end of the half-wave rectification circuit is respectively connected with the non-inverting input end of the comparator U3A and the inverting input end of the comparator U3B through a filter circuit, the filter circuit is a low-pass filter composed of a resistor R99 and a capacitor C94, the inverting input end of the comparator U3A is inputted with a high threshold voltage Vhig, the non-inverting input end of the comparator U3B is inputted with a low threshold voltage Vlow, the output end of the comparator U3A is connected with the base of a triode Q4, the collector of the triode Q4 is connected with the positive pole of the diode D3, the output end of the comparator U3B is connected with the base of a triode Q5, the collector of a triode Q5 is connected with the positive pole of a diode D56, the emitter of the Q8253 and the emitter of the transistor Q5 are all grounded, the cathode of the diode D3 and the cathode of the diode D5 are both connected to the pin IN of the dual-path analog switch chip U14 through the resistor R111. The model number of the two-way analog switch chip U14 in this embodiment is ADG 1219.

The operational amplifier U12A and the operational amplifier U12B form a half-wave rectifying circuit in a combined mode, the rectifying amplification factor A of the half-wave rectifying circuit is R90/R89, and the rectifying amplification factor can be changed by changing the ratio of R90 to R89. In this example, a is 1. After half-wave rectification, the input audio signal is subjected to RC filtering through a low-pass filter consisting of a resistor R99 and a capacitor C94, and then a direct-current voltage V is output.

The output direct current voltage V is input into a pin 3 of a comparator U13A on one hand, and according to the logic characteristic of a comparator LM193, when the input voltage V of the pin 3 is smaller than the threshold voltage Vhig of the pin 2, the pin 1 outputs high level; the output dc voltage V is input to the pin 6 of the comparator U13B, and according to the logic characteristic of the comparator LM193, when the input voltage V at the pin 6 is greater than the threshold voltage Vlow at the pin 5, the pin 7 outputs a high level. In this embodiment, the threshold voltage Vhig ≈ 5 × R93/(R93+ R91), and Vlow ≈ 5 × R105/(R104+ R105), where Vhig ≈ 1.5V and Vlow ≈ 20 mV.

The level output by pin 1 and pin 7 of the comparator LM193 respectively controls the on-off of the triode Q4 and the triode Q5, and the high level and the low level are output through an output end of an OR gate consisting of a diode D3 and a diode D5.

When the audio signal is greater than a certain upper limit valve value (for example, 1.5V in this example), a high level is output through an or gate output end composed of diodes, so that the two-way analog switch chip U14 is triggered to short-circuit the signal output to the signal ground, and thus the output amplitude limiting protection function is achieved; when the audio signal is less than a certain lower limit threshold value (e.g., 20mV in this example), a high level is output through the or gate output terminal of the diode, thereby triggering the two-way analog switch chip U14 to short-circuit the signal output to signal ground, which acts as a squelch.

In summary, in the embodiment of the present invention, the original audio signal is input through the audio input interface, the audio signal is amplified through the power amplifier control unit, and the audio signal is converted into the sound wave through the transducer in the speaker and then emitted. The arc-shaped horn 100 can realize directional transmission of sound waves, and the curvature radius of the front end surface of the reflecting cover 200 is the same as that of the vibrating diaphragm of the transducer 300, so that the distances from all parts of the vibrating diaphragm of the transducer 300 to the throat part of the horn 100 are the same, and the sound waves reaching the throat part of the horn 100 have the same phase, thereby reducing distortion and meeting the requirement of directional transmission of strong sound waves.

In addition, the automatic gain adjustment circuit in the signal processing unit 620 performs automatic gain adjustment on the audio signal to keep the stability of the output audio signal, when the audio signal is large, the amplitude limiting and muting circuit in the signal processing unit 620 plays a role in output amplitude limiting protection, when the audio signal is small, the amplitude limiting and muting circuit plays a role in muting, and the problems of sound breaking, noise and the like of sound waves emitted by the loudspeaker can be effectively avoided

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (9)

1. A megasonic directional sonicator, comprising:

the audio input device comprises a shell, a voice input interface and a voice output interface, wherein the shell is provided with the audio input interface;

the power amplifier control unit is arranged in the shell, and the input end of the power amplifier control unit is connected with the audio input interface;

the loudspeaker, the loudspeaker includes horn (100), bowl (200) and transducer (300), power amplifier control unit's output is connected transducer (300), horn (100) are installed the one end of casing, bowl (200) are installed just be located in horn (100) on the axis of horn (100), install transducer (300) in bowl (200), the radius of curvature of bowl (200) preceding terminal surface with the radius of curvature of transducer (300) vibrating diaphragm is the same, the bore of horn (100) is from inside to outside crescent.

2. A megasonic directional sonicator as claimed in claim 1 wherein: the audio input interface comprises an AUX interface and an MIC interface, and the AUX interface and the MIC interface are respectively connected with the power amplifier control unit.

3. A megasonic directional sonicator as claimed in claim 2 wherein: and a howling suppressor (400) is arranged between the MIC interface and the power amplifier control unit.

4. A megasonic directional sonicator as claimed in claim 2 wherein: still be provided with phonographic recorder (510), audio decoder (520), MCU (530), memory (540) in the casing, the input of phonographic recorder (510) is connected the MIC interface, the signal input part of MCU (530) is connected to the output of phonographic recorder (510), memory (540) is connected in order to be used for the storage sound data in MCU (530), the input of audio decoder (520) is connected to the signal output part of MCU (530), the output of audio decoder (520) is connected the power amplifier control unit.

5. A megasonic directional sonicator as claimed in claim 1 wherein: the casing is the cuboid structure, the top of casing is provided with the handle.

6. A megasonic directional sonicator as claimed in claim 1 wherein: the power amplifier control unit comprises a CPU (610), a signal processing unit (620), an analog switch (630) and a power amplifier unit (640); the audio frequency input interface is connected the input of signal processing unit (620), the output of signal processing unit (620) is connected the input of analog switch (630), the output of analog switch (630) is connected the input of power amplifier unit (640), CPU (610) is connected the control end of power amplifier unit (640) is in order to be used for controlling the magnification, the output of power amplifier unit (640) is connected the speaker.

7. The megasonic directional sonicator of claim 6, wherein: the signal processing unit (620) comprises an automatic gain adjusting circuit and an amplitude limiting squelch circuit, the audio input interface is connected with the input end of the automatic gain adjusting circuit, the output end of the automatic gain adjusting circuit is connected with the input end of the amplitude limiting squelch circuit, and the output end of the amplitude limiting squelch circuit is connected with the input end of the analog switch (630).

8. The megasonic directional sonicator of claim 6, wherein: still be provided with volume control circuit (650) between analog switch (630) and power amplifier unit (640), CPU (610) is connected the control end of volume control circuit (650).

9. A megasonic directional sonicator as claimed in claim 1 wherein: an FM module (700) is further arranged in the casing, and the FM module (700) is connected with the input end of the power amplifier control unit.

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