CN209642950U - A kind of directional loudspeaker reducing noise - Google Patents
A kind of directional loudspeaker reducing noise Download PDFInfo
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- CN209642950U CN209642950U CN201920225664.6U CN201920225664U CN209642950U CN 209642950 U CN209642950 U CN 209642950U CN 201920225664 U CN201920225664 U CN 201920225664U CN 209642950 U CN209642950 U CN 209642950U
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Abstract
The utility model relates to a kind of directional loudspeaker for reducing noise and the methods for reducing directional loudspeaker noise, including signal amplifier, signal modulator group, power amplifier group and ultrasonic transducer, each signal modulator uses the high-frequency modulation signal of different frequency, reduce the output power of power amplifier group, brewed electric signal is converted to ultrasonic signal and launched by each ultrasonic wave energy transducer head group.The voice signal of each ultrasonic wave energy transducer head group output is mutually superimposed, and the power of superimposed voice signal is consistent with only with output power when a high-frequency modulation signal, and the loudness of sound is constant.Each secondary harmonic component that the ultrasonic signal of each ultrasonic wave energy transducer head group output generates is mutually superimposed, the frequency number that superimposed secondary harmonic component includes increases, but the amplitude of each secondary harmonic component is reduced with the increase of the frequency number of modulated signal, to reduce interference of each secondary harmonic noise to human ear, achieve the purpose that reduce noise.
Description
Technical field
The utility model relates to signal processing technology fields, and in particular to a kind of directional loudspeaker for reducing noise.
Background technique
Directional loudspeaker can be used for the voice promptings such as advertisement, exhibitions, guide, can be used for the public places such as boarding lounge
Directional guide, to realize that sound is broadcasted for the orientation of required crowd, powerful directional loudspeaker can also be used in greasy weather navigation channel
The fields such as commander, air traffic public security commander.The non-linear interaction that directional loudspeaker utilizes ultrasonic wave to propagate in air,
High directivity is generated from audible sound is demodulated, to realize the direction propagation of sound frequency.The principle of directional loudspeaker is using super
The directionality of sound wave, audible sound is modulated on ultrasonic wave, discharges audible sound during ultrasonic wave is propagated.However it is super
Sound wave can generate audible secondary harmonic after entering human ear, for example the ultrasonic wave of 40KHz can generate 10KHz in human ear,
The secondary harmonics such as 8KHz, cause high frequency noise, influence sound quality and even people are allowed to feel ear-piercing.
Utility model content
In view of this, the method for the reduction directional loudspeaker noise of high frequency noise can be reduced it is necessary to provide one kind and subtracted
The directional loudspeaker of few noise.
A kind of directional loudspeaker reducing noise, including signal amplifier, signal modulator group, power amplifier group and super
Acoustic wave transducer, the signal modulator group include at least two signal modulators, and the power amplifier group includes at least two
A power amplifier, the ultrasonic transducer include at least two ultrasonic wave energy transducer head groups, described two ultrasonic wave energy transducer heads
Group is respectively connected to two power amplifiers, and two power amplifiers are respectively connected to two signal modulations
Device, two signal modulators are connected to the signal amplifier, and two signal modulators use different tune respectively
The voice signal that frequency processed inputs the signal amplifier is modulated, and modulated signal is respectively through the corresponding power
Described two ultrasonic wave energy transducer head groups are sent to after amplifier amplification, described two ultrasonic wave energy transducer head groups are respectively by corresponding institute
The brewed electric signal that power amplifier transmission comes is stated to be converted to ultrasonic signal and launch.
Further, the signal modulator group includes multiple signal modulators, and the power amplifier group includes
Multiple power amplifiers, the ultrasonic transducer include multiple ultrasonic wave energy transducer head groups, a ultrasonic wave energy transducer head group,
One power amplifier and a signal modulator are in turn connected into a directional loudspeaker loudspeaker group, multiple orientation loudspeakings
Device loudspeaker group is connected to the signal amplifier simultaneously, and each directional loudspeaker loudspeaker group uses different modulation frequencies respectively
The voice signal that rate inputs the signal amplifier is modulated, and each ultrasonic wave energy transducer head group will be connected thereto respectively
The power amplifier transmission come brewed electric signal be converted to ultrasonic signal and launch.
Further, each ultrasonic wave energy transducer head group includes multiple ultrasonic wave energy transducer heads, multiple ultrasonic waves
Energy head is arranged using array manner.
It further, further include PCB circuit board, multiple ultrasonic wave energy transducer head grouping arrangements, and it is electric as unit of group
Property is connected to the PCB circuit board.
In the directional loudspeaker of above-mentioned reduction noise, using the high-frequency modulation signal of multiple a different frequencies to voice signal
It is modulated, and modulated signal is respectively sent to multiple ultrasonic wave energy transducer head groups, the ultrasonic transducer will
Modulated signal is converted to ultrasonic signal and launches.Ultrasonic signal generates multiple secondary harmonics point after entering human ear
Amount, the secondary harmonic component within the scope of audible sound form noise.The power of the high-frequency modulation signal is reduced, can be reduced secondary
The power for the noise that grade harmonic wave is formed, while using the high-frequency modulation signal of different frequency, it can produce different frequency
Secondary harmonic, the noise formed after being superimposed the secondary harmonic of each different frequency, than using a high-power high frequency modulated
The slowed noise generated when signal, and ear-piercing high frequency noise will not be generated.Moreover, the high frequency modulated of each different frequency
Signal demodulates the voice signal formed after the voice signal superposition come and using production when a high-power high-frequency modulation signal
Raw voice signal loudness is consistent.The high frequency noise of ultrasonic signal generation can be effectively reduced in this way.The utility model
It has the advantages of simple structure and easy realization, it is low in cost, convenient for promoting.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the directional loudspeaker of the reduction noise of the utility model embodiment.
Fig. 2 is the structural representation of the ultrasonic transducer group of the directional loudspeaker of the reduction noise of the utility model embodiment
Figure.
Fig. 3 is the high-frequency modulation signal of the method for the reduction directional loudspeaker noise of the utility model embodiment using f1=
Secondary harmonic component profile when 40kHz.
Fig. 4 is the high-frequency modulation signal of the method for the reduction directional loudspeaker noise of the utility model embodiment using f2=
Secondary harmonic component profile when 35kHz.
Fig. 5 is the high-frequency modulation signal of the method for the reduction directional loudspeaker noise of the utility model embodiment using f1+
Secondary harmonic component profile when f2=40kHz+35kHz.
Specific embodiment
The present embodiment is practical to this below with reference to specific embodiments and the drawings by taking the directional loudspeaker for reducing noise as an example
It is novel to be described in detail.
Fig. 1 and Fig. 2 are please referred to, a kind of directional loudspeaker 100 reducing noise provided by the embodiment of the utility model is shown,
Including signal amplifier 10, signal modulator group 20, power amplifier group 30 and ultrasonic transducer 40, the signal modulator
Group 20 includes at least two signal modulators, and the power amplifier group 30 includes at least two power amplifiers, the ultrasound
Wave transducer 40 includes at least two ultrasonic wave energy transducer head groups, and described two ultrasonic wave energy transducer head groups are respectively connected to described in two
Power amplifier, two power amplifiers are respectively connected to two signal modulators, two signal modulators
It is connected to the signal amplifier, two signal modulators respectively amplify the signal using different modulating frequencies
The voice signal of device input is modulated, and modulated signal is sent to institute after the corresponding power amplifier amplification respectively
Two ultrasonic wave energy transducer head groups are stated, what described two ultrasonic wave energy transducer head groups respectively carried out the corresponding power amplifier transmission
Brewed electric signal is converted to ultrasonic signal and launches.
Further, the directional loudspeaker 100 for reducing noise further includes PCB circuit board 50, multiple ultrasonic waves
Transducing head grouping arrangement, and the PCB circuit board 50 is electrically connected to as unit of group.Each ultrasonic wave energy transducer head group packet
Multiple ultrasonic wave energy transducer heads 43 are included, multiple ultrasonic wave energy transducer heads 43 are arranged using array manner.
Specifically, it is electrically connected for the ease of the PCB circuit board 50 with the ultrasonic wave energy transducer head 42, it is multiple described super
The ultrasonic wave energy transducer head that sound wave transducing head forms in one group, every group is arranged with array manner, and by each ultrasonic wave
The arrangement of transducing head component zone is connected in the PCB circuit board 50.
And a method of directional loudspeaker noise is reduced, reduction noise as described in any one of the above embodiments is passed through
Directional loudspeaker 100, which is realized, reduces noise, the high-frequency modulation signal strong using different directive property of signal modulator described in every group
The low frequency sound signals of signal amplifier output are modulated, the output power of power amplifier described in every group is to use
N/mono- of power when power amplifier described in one group, N be it is described reduce noise directional loudspeaker 100 include it is described
The group number of directional loudspeaker group.
Further, the low frequency sound signals are modulated to form modulation telecommunications through the strong high-frequency modulation signal of directive property
Number, the modulation signal amplifies through the power amplifier, and is converted to ultrasonic signal through the ultrasonic wave energy transducer head group
Launch.The ultrasonic signal goes out the former low frequency sound signals modulated through air filtration, due to the ultrasonic wave
Signal and the low frequency sound signals enter human ear simultaneously, and the ultrasonic signal is made to generate secondary harmonic in human ear.It is described
Secondary harmonic includes multiple secondary harmonic components, and the frequency of multiple secondary harmonic components is different, the high-frequency modulation signal
Frequency be each secondary harmonic component frequency integral multiple, the frequency values of each secondary harmonic component are described
N/mono- of the frequency of high-frequency modulation signal, n are natural number；And the amplitude of each secondary harmonic component is with frequency
It reduces and reduces, the range value of each secondary harmonic component is the half of the range value of the previous secondary harmonic component.Respectively
The range value of a secondary harmonic component is directly proportional to the performance number of the high-frequency modulation signal, i.e., each secondary harmonic
The amplitude of component is reduced with the reduction of the power of the high-frequency modulation signal.
Further, the low frequency sound signals of different high-frequency modulation signals carrying restore after air filtration
And be superimposed, form the voice signal of orientation；Each secondary harmonic component that the ultrasonic signal of different frequency generates
Superposition forms the small faint noise of signal power.
Specifically, Fig. 3, Fig. 4 and Fig. 5 are please referred to, in the present embodiment, using two ultrasonic wave energy transducer head groups, two
The high-frequency modulation signal that the signal modulator uses is respectively 40kHz and 35kHz.
The directional loudspeaker 100 of the reduction noise in the present embodiment includes: 10, two signal modulations of signal amplifier
Device, two power amplifiers and two ultrasonic wave energy transducer head groups.Two ultrasonic wave energy transducer head groups include the first ultrasonic waves
Energy head group 41 and the second ultrasonic wave energy transducer head group 42, two signal modulators include the first signal modulator 21 and second
Signal modulator 22, two power amplifiers include the first power amplifier 31 and the second power amplifier 32；Described
One ultrasonic wave energy transducer head group 41 is sequentially connected with first power amplifier 31, first signal modulator 21, and described
Two ultrasonic wave energy transducer head groups 42 are sequentially connected with second power amplifier 32, the second signal modulator 22, and described
One signal modulator 21 and the second signal modulator 22 are respectively connected to the signal amplifier 10.The first signal tune
First high-frequency modulation signal f1 of device 21 processed uses 40kHz signal, and the second high frequency modulated of the second signal modulator 22 is believed
Number f2 uses 35kHz signal.
Specifically, the first high-frequency modulation signal f1=40kHz, the ultrasonic signal and its each secondary harmonic component that f1 is generated
Frequency be respectively each secondary harmonic of 20kHz, 13.3kHz, 10kHz, 8kHz, 6.67kHz, 5.7kHz, 5kHz, 4.4kHz ...
The amplitude of component is reduced with the reduction of the frequency of harmonic component.
Specifically, the second high-frequency modulation signal f1=35kHz, the ultrasonic signal and its each secondary harmonic component that f1 is generated
Frequency be respectively 17.5kHz, 11.7kHz, 8.75kHz, 7kHz, 5.83kHz, 5kHz, 4.38kHz, 3.89kHz ... each time
The amplitude of grade harmonic component is reduced with the reduction of the frequency of harmonic component.
Specifically, reduce the output power signal of first power amplifier 31 and second power amplifier 32,
Make the output power after reducing only with the half of output power when a high-frequency modulation signal.
Specifically, the voice signal of the ultrasonic transducer output and the power of each secondary harmonic component signal are all corresponding
Ground is reduced to the half only with output power when a high-frequency modulation signal.
Two ultrasonic wave energy transducer head groups output voice signal it is mutually superimposed, the power of superimposed voice signal with only adopt
Consistent with output power when a high-frequency modulation signal, the loudness of sound is consistent.
Each secondary harmonic component that the ultrasonic signal of two ultrasonic wave energy transducer head group outputs generates is mutually superimposed, after superposition
Secondary harmonic component frequencies be 20kHz, 17.5kHz, 13.3kHz, 11.7kHz, 10kHz, 8.75kHz, 8kHz, 7kHz,
The amplitude of each secondary harmonic component of 6.67kHz, 5.83kHz, 5.7kHz, 5kHz, 4.4kHz, 4.38kHz, 3.89kHz ... is
Only with the half of output power when a high-frequency modulation signal.
The ultrasonic wave and infrasound that human ear can't hear in each secondary harmonic component are removed, the audible frequency formation of human ear is made an uproar
Sound, since the amplitude of each secondary harmonic component reduces, the impression for the noise for hearing human ear dies down, and not particularly pertinent height
Volume noise.
In another embodiment of the utility model, the signal modulator group 20 includes multiple signal modulations
Device, the power amplifier group 30 include multiple power amplifiers, and the ultrasonic transducer 40 includes multiple ultrasonic waves
Transducing head group, a ultrasonic wave energy transducer head group, a power amplifier and a signal modulator are in turn connected into an orientation
Loudspeaker horn group, multiple directional loudspeaker loudspeaker groups are connected to the signal amplifier simultaneously, and each orientation is raised
Sound device loudspeaker group is modulated using the voice signal that different modulating frequencies inputs the signal amplifier respectively, Mei Gesuo
State ultrasonic wave energy transducer head group the brewed electric signal that power amplifier transmission connected to it comes is converted to respectively it is super
Acoustic signals are simultaneously launched.
Specifically, increase the grouping of the signal modulator group 20, power amplifier group 30 and ultrasonic transducer group 40
Number, increases the frequency number of high-frequency modulation signal, while reducing the output power of the power amplifier group 30, can believe in sound
Under the premise of number power is constant, the influence for the noise that each secondary harmonic component is formed is further decreased.
In the directional loudspeaker 100 of above-mentioned reduction noise, using the high-frequency modulation signal of multiple a different frequencies to sound
Signal is modulated, and modulated signal is respectively sent to multiple ultrasonic wave energy transducer head groups, the ultrasonic wave transducer
Modulated signal is converted to ultrasonic signal and launched by device.Ultrasonic signal generates multiple secondary harmonics after entering human ear
Component, the secondary harmonic component within the scope of audible sound form noise.The power of the high-frequency modulation signal is reduced, can be reduced
The power for the noise that secondary harmonic is formed, while using the high-frequency modulation signal of different frequency, it can produce different frequency
Secondary harmonic, the noise that is formed after being superimposed the secondary harmonic of each different frequency, than using a high-power high frequency modulation
The slowed noise generated when signal processed, and ear-piercing high frequency noise will not be generated.Moreover, the high frequency modulation of each different frequency
When signal processed demodulates the voice signal formed after the voice signal superposition come and uses a high-power high-frequency modulation signal
The voice signal loudness of generation is consistent.The high frequency noise of ultrasonic signal generation can be effectively reduced in this way.The utility model
Have the advantages of simple structure and easy realization, it is low in cost, convenient for promote.
It should be noted that the above is only the preferred embodiment of the present invention, it is practical new to be not limited to this
Type, to those skilled in the art, the utility model can have various modifications and changes.All spirit in the utility model
With any modification, equivalent replacement, improvement and so within principle, should be included within the scope of protection of this utility model.
Claims (4)
1. a kind of directional loudspeaker for reducing noise, which is characterized in that put including signal amplifier, signal modulator group, power
Big device group and ultrasonic transducer, the signal modulator group include at least two signal modulators, the power amplifier group
Including at least two power amplifiers, the ultrasonic transducer includes at least two ultrasonic wave energy transducer head groups, described two super
Sound wave transducing head group is respectively connected to two power amplifiers, and two power amplifiers are respectively connected to described in two
Signal modulator, two signal modulators are connected to the signal amplifier, and two signal modulators use respectively
The voice signal that different modulating frequencies inputs the signal amplifier is modulated, and modulated signal is respectively through corresponding
Described two ultrasonic wave energy transducer head groups are sent to after the power amplifier amplification, described two ultrasonic wave energy transducer head groups respectively will
The brewed electric signal that the corresponding power amplifier transmission comes is converted to ultrasonic signal and launches.
2. reducing the directional loudspeaker of noise as described in claim 1, which is characterized in that the signal modulator group includes more
A signal modulator, the power amplifier group include multiple power amplifiers, and the ultrasonic transducer includes
Multiple ultrasonic wave energy transducer head groups, a ultrasonic wave energy transducer head group, a power amplifier and a signal modulator are sequentially connected
At a directional loudspeaker loudspeaker group, multiple directional loudspeaker loudspeaker groups are connected to the signal amplifier simultaneously, each
The directional loudspeaker loudspeaker group respectively carries out the voice signal that the signal amplifier inputs using different modulating frequencies
Modulation, the brewed telecommunications that each ultrasonic wave energy transducer head group respectively carrys out the power amplifier transmission connected to it
It number is converted to ultrasonic signal and launches.
3. reducing the directional loudspeaker of noise as claimed in claim 2, which is characterized in that each ultrasonic wave energy transducer head group
Including multiple ultrasonic wave energy transducer heads, multiple ultrasonic wave energy transducer heads are arranged using array manner.
4. reducing the directional loudspeaker of noise as claimed in claim 3, which is characterized in that further include PCB circuit board, Duo Gesuo
Ultrasonic wave energy transducer head grouping arrangement is stated, and is electrically connected to the PCB circuit board as unit of group.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920225664.6U CN209642950U (en) | 2019-02-22 | 2019-02-22 | A kind of directional loudspeaker reducing noise |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022227579A1 (en) * | 2021-04-30 | 2022-11-03 | 华为技术有限公司 | Voice signal transmission method, sending device, and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022227579A1 (en) * | 2021-04-30 | 2022-11-03 | 华为技术有限公司 | Voice signal transmission method, sending device, and storage medium |
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