Folding sound box

Abstract

The invention discloses a folding sound box, and relates to the field of playing equipment, and the folding sound box comprises at least two loudspeakers which are used for receiving an audio signal and making a sound according to the audio signal; the loudspeakers are arranged at the two ends of the folding cylinder, and the folding cylinder is arranged in a telescopic mode so that the distance between the two loudspeakers can be adjusted; and the phase control device is arranged on the folding cylinder, and the phase control device is used for detecting the distance between the two loudspeakers in real time and adjusting audio signals transmitted to the loudspeakers according to the distance.

Description

Technical Field

[0001] The present invention relates to the technical field of playback devices, and particularly relates to a foldable speaker. Background Art

[0002] Existing foldable speakers adopt a telescopic structure, and the telescoping of the folding tube is achieved by the mutual sliding between the end tube, the inner tube and the outer tube. The inner tube and the outer tube are respectively connected with an end tube, and a speaker is installed on the end tube. However, during use, when the foldable speaker is in different telescopic states, the distance between the two speakers will change. This change in distance will cause a change in the phase relationship of the sound waves emitted by the two speakers in space, resulting in the distortion of the stereo sound field. Especially when playing stereo music, due to the change in the phase relationship, the spatial positioning of the musical instruments will shift, seriously affecting the user's listening experience. Summary of the Invention

[0003] The main object of the present invention is to provide a foldable speaker, aiming to solve the technical problem that the distortion of the stereo sound field caused by the change in the distance between the two speakers of the foldable speaker affects the user's listening experience.

[0004] To achieve the above object, the foldable speaker proposed by the present invention includes:

[0005] Speakers, at least two are provided, and the speakers are used to receive audio signals and emit sounds according to the audio signals;

[0006] A folding tube, both ends of the folding tube are provided with the speakers, and the folding tube is telescopically arranged to adjust the distance between the two speakers; and

[0007] A phase control device, which is arranged in the folding tube, and the phase control device is used to detect the distance between the two speakers in real time and adjust the audio signal transmitted to the speakers according to the distance. Description of the Drawings

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0009] Figure 1 It is a structural block diagram of a phase control device of an embodiment of the foldable speaker provided by the present invention;

[0010] Figure 2 It is another structural block diagram of a phase control device of an embodiment of the foldable speaker provided by the present invention;

[0011] Figure 3 Schematic diagram of the structure of the folding speaker according to an embodiment of the present invention;

[0012] Figure 4 Partial cross-sectional schematic diagram of the folding speaker according to an embodiment of the present invention.

[0013] Explanation of the reference numerals in the drawings:

[0014] 100, speaker;

[0015] 200, folding cylinder; 210, inner cylinder; 211, crease; 220, outer cylinder; 230, end cylinder;

[0016] 300, main control component; 310, central processing unit; 320, memory;

[0017] 400, distance measurement component; 410, transmitter; 420, receiver; 430, signal conversion circuit;

[0018] 500, audio adjustment component; 511, delay unit; 512, phase adjuster; 520, audio power amplifier circuit;

[0019] 600, signal processing component; 610, analog signal conditioning circuit; 620, analog-to-digital converter; 630, digital signal processor.

[0020] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0023] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] In the prior art, when the folding speaker is in different telescopic states, the distance between the two speakers changes. This change in distance causes a change in the phase relationship of the sound waves emitted by the two speakers in space, resulting in distortion of the stereo sound field. Especially when playing stereo music, due to the change in the phase relationship, the spatial positioning of the musical instruments will shift, seriously affecting the user's listening experience.

[0025] The present invention provides a folding speaker.

[0026] Please refer to Figures 1 to 4 , in an embodiment of the present invention, the folding speaker includes: a speaker 100, a folding cylinder 200, and a phase control device. Among them, there are at least two speakers 100. The speaker 100 is used to receive an audio signal and emit sound according to the audio signal; both ends of the folding cylinder 200 are provided with speakers 100, and the folding cylinder 200 is telescopically arranged to adjust the distance between the two speakers 100; the phase control device is arranged on the folding cylinder 200, and the phase control device is used to detect the distance between the two speakers 100 in real time and adjust the audio signal transmitted to the speaker 100 according to the distance.

[0027] In this embodiment, the folding cylinder 200 is telescopically arranged to realize the foldable function of the folding speaker. The two speakers 100 are respectively installed at opposite ends of the folding cylinder 200, and the distance between the two speakers 100 is changed by the telescopic movement of the folding cylinder 200. The speaker 100 receives the audio signal and emits sound according to the audio signal. Among them, the audio signal can be any device that can issue an audio control command, such as an audio playback device or a streaming media device like a computer or a mobile phone.

[0028] In the specific implementation process, the phase control device dynamically adjusts the audio signal by detecting the distance between the two speakers 100 in real time, and the speaker 100 emits sound according to the adjusted audio signal, thereby avoiding the interference between the sounds emitted by the two speakers 100.

[0029] In the technical solution of the present invention, the speakers 100 are arranged at both ends of the folding cylinder 200. The folding cylinder 200 is telescopically arranged, and the distance between the two speakers 100 can be adjusted to realize the foldable setting of the speaker. A phase control device is arranged in the folding cylinder 200 to detect the distance between the two speakers 100, and the audio signal transmitted to the speakers 100 is adjusted in real time according to the actual distance, so as to realize the dynamic adjustment of the audio signal, avoid the distortion of the stereo sound field, and improve the user's listening experience.

[0030] Reference Figure 1 and Figure 2 As shown, in an embodiment, the phase control device includes: a main control component 300, a distance measurement component 400, and an audio adjustment component 500. Among them, the distance measurement component 400 is used to measure the distance between the two speakers 100. The main control component 300 calculates the adjustment amount according to the distance. The audio adjustment component 500 is electrically connected to the main control component 300, and the audio adjustment component 500 adjusts the audio signal according to the adjustment amount to form an adjusted audio signal. The audio adjustment component 500 is electrically connected to the speakers 100.

[0031] In this embodiment, the distance measurement component 400 measures the distance between the two speakers 100 in real time. The main control component 300 calculates the adjustment amount according to the real-time distance, and then sends the adjustment amount to the audio adjustment component 500. The audio adjustment component 500 adjusts the audio signal according to the adjustment amount, so that the audio signal forms an adjusted audio signal, and sends the adjusted audio signal to the speakers 100. The speakers 100 emit sound according to the adjusted audio signal, avoiding the interference of the sounds emitted by the two speakers 100. In the specific implementation process, the audio adjustment component 500 is connected with an audio cable, and the audio cable is connected to the speakers 100. The adjusted audio signal is sent to the speakers 100 through the audio cable.

[0032] In an embodiment, the distance measurement component 400 includes a transmitter 410, a receiver 420, and a signal conversion circuit 430. Among them, the connection line between the transmitter 410 and the receiver 420 is in the axial direction of the folding cylinder 200. The transmitter 410 is arranged at one end of the folding cylinder 200, and the receiver 420 is arranged at the other end of the folding cylinder 200. The signal conversion circuit 430 is electrically connected to the receiver 420. The transmitter 410 emits an optical signal towards the receiver 420. The receiver 420 receives the optical signal and converts it into an electrical signal and transmits it to the signal conversion circuit 430. The signal conversion circuit 430 receives the electrical signal and converts it into a distance measurement signal to represent the distance between the two speakers 100.

[0033] In the specific implementation process, the transmitter 410 is used to emit an optical signal, and the receiver 420 is used to receive the optical signal emitted by the transmitter 410 and convert the optical signal into an electrical signal. The intensity of the electrical signal is inversely proportional to the distance between the transmitter 410 and the receiver 420. The signal conversion circuit 430 converts the electrical signal into a distance measurement signal, and the distance measurement signal is a standard voltage signal used to characterize the real-time distance between the two speakers 100. The transmitter 410 and the receiver 420 are respectively installed at opposite ends of the folding cylinder 200, and the transmitter 410 and the receiver 420 are arranged opposite to each other along the axial center line of the folding cylinder 200. When the folding cylinder 200 is folded, the distance between the transmitter 410 and the receiver 420 changes synchronously. Specifically, when the folding cylinder 200 extends, the distance between the transmitter 410 and the receiver 420 increases, and when it retracts, the distance between the transmitter 410 and the receiver 420 decreases. The transmitter 410 uses a light emitter and emits infrared light, such as an LED, and the receiver 420 uses a photoelectric receiver 420, such as a photodiode.

[0034] Further, the signal conversion circuit 430 and the receiver 420 are arranged on the first circuit board, and the first circuit board is installed at one end of the folding cylinder 200. Specifically, an installation groove is opened at one end of the folding cylinder 200, and the first circuit board is embedded in the installation groove and fixed by screws. The light emitter is fixed at the other end of the folding cylinder 200, and an installation groove is also opened on the inner wall of the other end of the folding cylinder 200. The light emitter is embedded in the installation groove and fixed by screws.

[0035] In an embodiment, the main control component 300 includes a central processing unit 310 and a memory 320. The memory 320 stores compensation curve data, and the central processing unit 310 obtains an adjustment amount according to the distance and the compensation curve data. The adjustment amount includes a delay amount and a phase adjustment amount.

[0036] In the specific implementation process, the central processing unit 310 calculates and obtains the adjustment amount in real time according to the distance, and at the same time controls the working states of each circuit. Specifically, the central processing unit 310 obtains the real-time distance obtained by the distance measurement component 400, and obtains the adjustment amount according to the real-time distance with reference to the compensation curve data. Among them, the compensation curve data includes the corresponding relationship between the delay amount and the phase adjustment amount at different distances, and various compensation curve data are stored in the memory 320, and the memory 320 also stores system configuration parameters.

[0037] Further, the folding cylinder 200 is provided with a second circuit board, and the main control component 300 is arranged on the second circuit board. Specifically, the second circuit board is installed on the inner wall of the folding cylinder 200 and is connected to the audio adjustment component 500 through a flexible circuit board.

[0038] In one embodiment, the audio adjustment component 500 includes a channel processing circuit and an audio power amplifier circuit 520. The channel processing circuit is configured to adjust the delay and phase of an audio signal to form an adjusted audio signal, and the audio power amplifier circuit 520 is configured to amplify the adjusted audio signal.

[0039] In a specific implementation process, the channel processing circuit and the audio power amplifier circuit 520 are electrically connected and integrated on a fourth circuit board, and the fourth circuit board is mounted on the inner wall of the folding cylinder 200. In this embodiment, the channel processing circuit includes a left channel processing circuit and a right channel processing circuit, and the circuit structures of the two are the same. Specifically, the channel processing circuit includes a delay device 511 and a phase adjuster 512. The delay device 511 is configured to perform time-domain delay on the audio signal, and the phase adjuster 512 is configured to adjust the phase of the audio signal.

[0040] The delay device 511 includes a shift register array and a clock control circuit. The clock control circuit controls the number of stages of the shift register to achieve different delay times. The range of the delay time is 0 - 100 microseconds, and the step is 1 microsecond; the phase adjustment range of the phase adjuster 512 is 0 - 360 degrees, and the adjustment accuracy is 1 degree.

[0041] In a specific implementation process, the delay device 511 adopts a digital delay line structure, including a shift register array and a clock control circuit. Different delay times are achieved by controlling the number of stages of the shift register. The delay time can be adjusted within the range of 0 - 100 microseconds with a step of 1 microsecond. The phase adjuster 512 is configured to adjust the phase of the audio signal. The phase adjuster 512 includes an operational amplifier, resistors, and a capacitor network. The signal phase is adjusted by changing the parameters of the resistor and capacitor network. The phase adjustment range is 0 - 360 degrees, and the adjustment accuracy is 1 degree. The audio power amplifier circuit 520 includes a PWM modulator, a driving stage, and a MOSFET output stage. The PWM modulator converts the audio signal into a high-frequency PWM signal. The driving stage performs level conversion and driving ability enhancement on the PWM signal. The MOSFET output stage operates in a high-frequency switching state and restores the PWM signal to an amplified audio signal through an LC filter network.

[0042] In one embodiment, the phase control device further includes a signal processing component 600. The signal processing component 600 is electrically connected to the main control component 300 and the distance measurement component 400 respectively. The distance measurement component 400 sends a distance measurement signal to the signal processing component 600. The signal processing component 600 processes the distance measurement signal to obtain a distance value and sends it to the main control component 300.

[0043] It should be noted that the main control component 300 is also connected to the signal processing component 600 through a flexible circuit board, and the signal processing component 600 is also connected to the distance measurement component 400 through another flexible circuit board. The distance measurement component 400 measures the distance between the two speakers 100 in real time and generates a distance measurement signal of a standard voltage signal, that is, an analog signal. The signal processing component 600 is electrically connected to the distance measurement component 400 and receives the analog signal representing the distance between the two speakers 100, processes the analog signal to obtain a distance value, and sends it to the main control component 300.

[0044] In a specific implementation process, the signal processing component 600 includes an analog signal conditioning circuit 610, an analog-to-digital converter 620, and a digital signal processor 630. The analog signal conditioning circuit 610 is electrically connected to the distance measurement component 400 and receives the distance measurement signal. The analog signal conditioning circuit 610 amplifies and filters the distance measurement signal. The analog-to-digital converter 620 receives the analog signal and converts it into a digital signal. The digital signal processor 630 receives the digital signal and calculates the distance value.

[0045] In this embodiment, the folding cylinder 200 is provided with a third circuit board, and the signal processing component 600 is arranged on the third circuit board. In a specific implementation process, the analog signal conditioning circuit 610, the analog-to-digital converter 620, and the digital signal processor 630 are integrated on the third circuit board. Among them, the analog signal conditioning circuit 610 is electrically connected to the signal conversion circuit 430 of the distance measurement component 400 through a flexible circuit board, is used to amplify and filter the distance measurement signal, and sends it to the analog-to-digital converter 620. The analog-to-digital converter 620 converts the analog signal into a digital signal. The analog-to-digital converter 620 transmits the digital signal to the digital signal processor 630. The digital signal processor 630 performs arithmetic processing on the digital signal to obtain an accurate distance value.

[0046] When the folding cylinder 200 is in any telescopic state, the distance measurement component 400 detects the distance between the two speakers 100 in real time and generates a distance measurement signal and sends it to the signal processing component 600. Specifically, the transmitter 410 emits an optical signal to the receiver 420. After receiving the optical signal, the receiver 420 converts the optical signal into an electrical signal. The receiver 420 sends the electrical signal to the signal conversion circuit 430. The signal conversion circuit 430 converts the electrical signal into a standard voltage signal, that is, an analog signal, as the distance measurement signal for representing the real-time distance between the two speakers 100. Among them, the receiver 420 and the signal conversion circuit 430 are integrated on the first circuit board, and the signal conversion circuit 430 is electrically connected to the signal conversion circuit 430 of the signal processing component 600 through a flexible circuit board and sends the analog signal to the analog signal conditioning circuit 610.

[0047] The signal processing component 600 converts the analog signal into a digital signal and obtains an accurate distance value. Specifically, after the analog signal conditioning circuit 610 receives the analog signal, it performs amplification and filtering processing. The analog-to-digital converter 620 converts the processed analog signal into a digital signal, and the digital signal processor 630 performs arithmetic processing on the digital signal to obtain an accurate distance value. The signal processing component 600 is integrated on the third circuit board and is electrically connected to the main control component 300 through a flexible circuit board.

[0048] Based on the distance value of the digital signal, the main control component 300 reads the corresponding compensation curve data from the memory 320 and calculates the delay amount and phase adjustment amount. Specifically, when the distance increases, the delay amount of the audio signal of the distal horn 100 is increased and its phase angle is decreased, and vice versa when the distance decreases. It can be understood that the calculation of the delay amount is based on the sound wave propagation speed and the measured distance, and the limit compensation is based on the relationship between the frequency and the delay amount. The main control component 300 is integrated on the second circuit board and is electrically connected to the audio adjustment component 500 through a flexible circuit board.

[0049] After receiving the delay amount and the phase adjustment amount, the audio adjustment component 500 realizes the corresponding delay amount through the technology of adjusting the shift register by the delay device 511, and the phase adjuster 512 realizes the required phase adjustment amount by changing the resistance and capacitance network parameters. For example, when the distance between the two horns 100 is 1 meter, the audio signal of the distal horn 100 needs to be delayed by about 2.94 milliseconds, and the phase compensation is about -90 degrees; when the distance between the two horns 100 is reduced by 0.5 meter, the delay amount and the phase compensation amount are correspondingly reduced by half. The adjusted audio signal is amplified by the audio power amplifier circuit 520 and then sent to the horn 100 through the audio cable to drive the horn 100 to emit sound. The audio adjustment component 500 is integrated on the fourth circuit board and is spaced from the third circuit board. The audio adjustment component 500 is electrically connected to the horn 100 component through the audio cable.

[0050] Reference Figure 3 and Figure 4 As shown in the figure, in an embodiment, the folding cylinder 200 includes an end cylinder 230, an inner cylinder 210, and an outer cylinder 220. There are two end cylinders 230 and two inner cylinders 210. One inner cylinder 210 is provided at each of the opposite ends of the outer cylinder 220. One end of the inner cylinder 210 facing away from the outer cylinder 220 is connected to the end cylinder 230, and the horn 100 is provided on the end cylinder 230.

[0051] In the specific implementation process, one end of the outer cylinder 220 is connected to one of the inner cylinders 210, and the other end of the outer cylinder 220 is connected to the other inner cylinder 210. One end of the inner cylinder 210 facing away from the outer cylinder 220 is connected to the corresponding end cylinder 230, and the speaker 100 is installed on the end cylinder 230. It can be understood that the outer cylinder 220 and the inner cylinder 210 are hollow, which is convenient for installing and accommodating electronic components and wire routing. The inner cylinder 210 can be folded and telescoped through structures such as a telescopic sleeve, and can also be telescoped by using an elastic or power structure. The end cylinder 230 is provided with a plurality of through holes, and the sound emitted by the speaker 100 is emitted through the through holes. The transmitter 410 of the distance measurement component 400 is installed on one of the end cylinders 230. The end cylinder 230 is provided with a mounting groove, and the transmitter 410 is embedded in the mounting groove and fixed by screws. The first circuit board is installed on the other end cylinder 230 and locked and fixed by screws. The second circuit board integrated with the main control component 300 is installed on the inner wall of the outer cylinder 220. The inner wall of the outer cylinder 220 is provided with a groove, and the second circuit board is fixed in the groove. The third circuit board integrated with the signal processing component 600 and the fourth circuit board integrated with the signal processing component 600 are respectively installed on the inner wall of the outer cylinder 220 and are arranged at intervals.

[0052] In one embodiment, the inner cylinder 210 is provided with a plurality of creases 211. In this embodiment, the creases 211 extend along the circumferential direction of the inner cylinder 210, and a plurality of creases 211 are arranged at intervals along the axial direction of the inner cylinder 210. The plurality of creases 211 enable the inner cylinder 210 to be folded inward and outward through the creases 211, thereby realizing telescoping. By pulling one or two outer cylinders 220 toward each other or away from each other, the folding of the inner cylinder 210 can be realized, that is, the telescoping of the folding speaker. Among them, the inner cylinder 210 can be made of materials such as rubber. Of course, other materials can also be used as long as they can be folded through the creases 211.

[0053] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A folding speaker, characterized in that: include: Speakers, at least two of which are used to receive audio signals and make sounds according to the audio signals; A folding cylinder, both ends of which are provided with the horns, and the folding cylinder can be telescopically arranged to adjust the distance between the two horns; as well as A phase control device is arranged on the folding tube, and the phase control device is used to detect the distance between the two speakers in real time and adjust the audio signal transmitted to the speakers according to the distance.

2. The folding speaker as claimed in claim 1, characterized in that: The phase control device comprises: Main control components; a distance measuring component, used for measuring the distance between the two speakers, and the main control component calculates the adjustment amount according to the distance; and The audio adjustment component is electrically connected to the main control component, and the audio adjustment component adjusts the audio signal according to the adjustment amount to form an adjusted audio signal, and the audio adjustment component is electrically connected to the speaker.

3. The folding speaker as claimed in claim 2, characterized in that: The distance measuring component includes a transmitter, a receiver and a signal conversion circuit, wherein the connection line between the transmitter and the receiver is in the axial direction of the folding cylinder, the transmitter is arranged at one end of the folding cylinder, and the receiver is arranged at the other end of the folding cylinder, and the signal conversion circuit is electrically connected to the receiver, the transmitter transmits a light signal to the receiver, the receiver receives the light signal and converts it into an electrical signal and transmits it to the signal conversion circuit, and the signal conversion circuit receives the electrical signal and converts it into a distance measurement signal to indicate the distance between the two speakers.

4. The folding speaker as claimed in claim 3, characterized in that: A first circuit board is disposed at one end of the folding cylinder, and the receiver and the signal conversion circuit are disposed on the first circuit board.

5. The folding speaker as claimed in claim 2, characterized in that: The main control component includes a central processing unit and a memory, the memory stores compensation curve data, and the central processing unit obtains the adjustment amount according to the distance and the compensation curve data, and the adjustment amount includes a delay amount and a phase adjustment amount.

6. The folding speaker as claimed in claim 2, characterized in that: The folding cylinder is provided with a second circuit board, and the main control component is provided on the second circuit board.

7. The folding speaker as claimed in claim 2, characterized in that: The audio adjustment component includes a channel processing circuit and an audio power amplifier circuit. The channel processing circuit is used to adjust the delay and phase of the audio signal to form the adjusted audio signal, and the audio power amplifier circuit is used to amplify the adjusted audio signal.

8. The folding speaker as claimed in claim 7, characterized in that: The channel processing circuit includes a delay device and a phase adjuster. The delay device is used to perform time domain delay on the audio signal, and the phase adjuster is used to adjust the phase of the audio signal.

9. The folding speaker as claimed in claim 8, characterized in that: The delay device includes a shift register array and a clock control circuit, and the clock control circuit controls the number of stages of the shift register to achieve different delay times, and the delay time ranges from 0 to 100 microseconds in steps of 1 microsecond; and / or, The phase adjustment range of the phase adjuster is 0-360 degrees, and the adjustment accuracy is 1 degree.

10. The folding speaker as claimed in claim 3, characterized in that: The phase control device also includes a signal processing component, which is electrically connected to the main control component and the distance measurement component respectively. The distance measurement component sends the distance measurement signal to the signal processing component, and the signal processing component processes the distance measurement signal to obtain a distance value and sends it to the main control component.

11. The folding speaker as claimed in claim 10, characterized in that: The signal processing component includes an analog signal conditioning circuit, a digital-to-analog converter and a digital signal processor. The analog signal conditioning circuit is electrically connected to the distance measurement component and receives the distance measurement signal. The analog signal conditioning circuit amplifies and filters the distance measurement signal. The digital-to-analog converter receives the analog signal and converts it into a digital signal. The digital signal processor receives the digital signal and calculates the distance value.

12. The folding speaker as claimed in claim 11, characterized in that: The folding cylinder is provided with a third circuit board, and the signal processing component is provided on the third circuit board.

13. The folding speaker as claimed in claim 1, characterized in that: The folding tube includes an end tube, an inner tube and an outer tube. Two end tubes and two inner tubes are provided. An inner tube is provided at each of the opposite ends of the outer tube. One end of the inner tube away from the outer tube is connected to the end tube. The horn is provided at the end tube.

14. The folding speaker as claimed in claim 13, characterized in that: The inner cylinder is provided with a plurality of folds.

Images