A lifting table

Abstract

The utility model discloses a lifting table, comprising a table top, a controller and two lifting columns, the two lifting columns are arranged at intervals on the left and right, the table top is arranged on the two lifting columns, and the controller is arranged on the table top; the table top is divided into a left part and a right part with a midline in the left-right direction as a boundary, and the left part and the right part are each provided with at least one collector, the collector is electrically connected to the controller, and the controller is electrically connected to the lifting columns; the movement of the lifting table is controlled by collecting knocking sounds by the collector, thereby solving the problems of voice control and vibration control respectively; each collector has a certain effective collection range, and collectors are arranged on the left and right parts of the table top, so that the effective collection ranges of all collectors cover the entire table top, and when the user knocks on the table top at any position, the collector can effectively collect the knocking audio, making it more convenient and quick to control the lifting table.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a lifting table. Background Art

[0002] In the lifting table, various hand controllers are basically used to control the lifting. There are many types of hand controllers, such as hand controllers with physical buttons, hand controllers with touch buttons, etc. However, the hand controllers set on the table board are more abrupt and the production cost is higher. Based on this problem, different sensors are designed to be set in the table board to control the lifting of the lifting table by voice or tapping vibration.

[0003] However, voice recognition needs to be performed in a quiet environment. The recognition rate will be significantly reduced in a noisy environment. At the same time, voice recognition requires certain specific sentences to be successfully recognized. This means that in daily life, if the words received in a normal chat are similar to the table control commands, they will be mistakenly recognized by the table. Finally, in a quiet environment, perhaps others are taking a rest, and using voice control at this time may disturb others. Therefore, the voice recognition solution has many inconveniences.

[0004] There are even more problems with tapping vibration control. First of all, the vibration sensor needs to be hard-connected to the table, and the connection structure must not have any shock-absorbing factors, otherwise the sensor may not be able to sense it when the table is tapped. Secondly, since the table legs are in direct contact with the ground, when someone walks by the table or there is a vibration source on the ground, the vibration signal will be captured by the sensor through the table legs, causing false triggering. Regular calibration is required to maintain accuracy, the measurement range is limited, and it is too sensitive to vibration and impact, and false touches are prone to occur when there are other vibration sources on the desktop. If a pressure plate is used to sense tapping, the tapping area must be demarcated on the table panel, and control can only be performed when tapping in the designated area. When the user is in a situation where it is inconvenient to free his hands, the corresponding tapping operation cannot be performed at all.

[0005] Therefore, we need a lifting table that can be controlled by tapping any position of the table top. Summary of the invention

[0006] In order to solve the above-mentioned technical problems, the utility model provides a lifting table, which controls the movement of the lifting table by collecting the knocking sound through a collector, thereby solving the problems of voice control and vibration control respectively; each collector has a certain effective collection range, and collectors are provided on the left and right parts of the table board, so that the effective collection range of all collectors covers the entire table board. When the user knocks on the table board at any position, the collector can effectively collect the knocking audio, making the control of the lifting table more convenient and quick.

[0007] The technical solution of the utility model is achieved in this way:

[0008] A lifting table comprises a table top, a controller and two lifting columns, the two lifting columns are arranged at intervals on the left and right, and the table top is set on the two lifting columns; the table top is divided into a left part and a right part by a midline in the left-right direction, and the left part and the right part are each provided with at least one collector, the collector is electrically connected to the controller, and the controller is electrically connected to the lifting columns; the collector is configured to collect audio in real time and transmit it to the controller in the form of an electrical signal; the controller is configured to control the movement of the lifting columns after the collector collects the audio generated by knocking and transmits the electrical signal to the controller.

[0009] The movement of the lift table is controlled by collecting the knocking sound through the collector, which solves the problems of voice control and vibration control respectively; each collector has a certain effective collection range, and collectors are installed on the left and right parts of the table top, so that the effective collection range of all collectors covers the entire table top. When the user knocks on the table top at any position, the collector can effectively collect the knocking audio, making the control of the lift table more convenient and quick.

[0010] Preferably, there are two collectors, which are respectively arranged at the center of the left and right parts. If there are only two collectors, the arrangement of arranging them at the center of the left and right parts is more reasonable, and can more evenly cover a sufficient range of the table board, thereby achieving full-range tapping control of the table board.

[0011] Preferably, there are four collectors, which are respectively arranged at the four corners of the table. When the table is tapped at any position, an adjacent collector can clearly collect the audio signal, and the adjacent collector can output the near-end signal value to determine the tapping position, and can also ensure that the near-end signal value can meet the requirements of the effective signal value, thereby preventing invalid operations caused by effective tapping errors and ensuring the accuracy of the operation.

[0012] As a preferred embodiment, there are four collectors in total, and the table is divided into four parts by the midline in the left-right direction and the midline in the front-back direction, and the four collectors are respectively arranged at the intersection of the two diagonal lines of each part. In this solution, the collector is arranged at the center of each part, that is, the collectors are evenly arranged on the table, and the audio signals in the entire table range can also be collected.

[0013] Preferably, a placement groove is provided on the table top, a mounting seat with a cavity is provided in the placement groove, the collector is arranged in the cavity of the mounting seat, and is mounted on the table top through the mounting seat. The collector is placed in the mounting seat, and the mounting seat is placed in the placement groove. The collector and the mounting seat are not exposed as a whole from the notch of the placement groove or only partially exposed, so as to avoid being abrupt as much as possible.

[0014] Preferably, a sound insulation piece is provided inside the cavity to block external noise. The sound insulation piece is made of silica gel or sound insulation cotton, and the sound insulation piece can block most of the vibration and noise from the external environment, which is beneficial to the accuracy of the collection.

[0015] Preferably, the collector is wrapped with a sound insulation piece to further reduce interference and increase the accuracy of collection.

[0016] Preferably, the collector is a microphone sensor.

[0017] The principle and beneficial effects of the utility model using the above technical solution are:

[0018] The movement of the lift table is controlled by collecting the knocking sound through the collector, which solves the problems of voice control and vibration control respectively; each collector has a certain effective collection range, and collectors are installed on the left and right parts of the table top, so that the effective collection range of all collectors covers the entire table top. When the user knocks on the table top at any position, the collector can effectively collect the knocking audio, making the control of the lift table more convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional view of the bottom side of the lifting table;

[0020] Figure 2 The figure is a three-dimensional image of the lower side of the table top;

[0021] Figure 3 It is a bottom stereogram of the collector and the mounting base;

[0022] Figure 4 It is a top perspective view of the collector and the mounting base;

[0023] Figure 5 This is an exploded view of the upper side of the collector and the mounting base;

[0024] Figure 6 This is the audio signal waveform of a finger tapping on a table sampled in a silent environment;

[0025] Figure 7 The waveform of the audio signal of a finger tapping the tabletop sampled under normal conditions and the waveform of the audio signal after low-pass filtering;

[0026] Figure 8 The waveform is the result of overlapping the audio signal waveform of a finger tapping the table board sampled in a normal environment and the audio signal waveform after low-pass filtering;

[0027] Fig. 9 This is a principle block diagram of the percussion audio acquisition and control system of the utility model;

[0028] Fig.10A bottom view of the installation position of the collector at the center of the four parts of the table board in the embodiment of the utility model;

[0029] Fig.11 A comparison diagram of the audio signal waveform collected by the collector outputting the near-end signal value in the embodiment of the present utility model and the audio signal waveform collected by the collector on the other side of the table;

[0030] Fig.12 This is a schematic diagram of the steps of the method in the embodiment of the utility model;

[0031] Fig.13 A comparison diagram of the audio signal waveform collected when knocking in the embodiment of the utility model and the audio signal waveform collected when a foreign object hits the table top;

[0032] Fig.14 It is a bottom view of the installation positions of two collectors in the central parts of the left and right parts of the table top in the embodiment of the utility model.

[0033] The figures are marked as follows: 1-collector, 2-mounting seat, 3-cavity, 4-microphone, 5-circuit board, 6-pickup end, 7-bottom end, 8-pickup hole, 9-open end, 10-end cover, 11-convex rib, 12-notch, 13-connecting part, 14-connecting hole, 15-socket, 16-table top, 17-mounting groove, 18-spacer. DETAILED DESCRIPTION

[0034] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0036] The specific implementation of the utility model is as follows:

[0037] like Figure 1 , 2As shown in Figures 10 and 14, the utility model provides a lifting table, including a table top 16, a controller and two lifting columns, the two lifting columns are arranged at intervals on the left and right, the table top 16 is arranged on the two lifting columns, and the controller is arranged on the table top 16; the table top 16 is divided into a left part and a right part by a center line in the left-right direction, and the left part and the right part are each provided with at least one collector 1, the collector 1 is electrically connected to the controller, and the controller is electrically connected to the lifting columns; the collector 1 is configured to collect audio in real time and transmit it to the controller in the form of an electrical signal; the controller is configured to control the movement of the lifting columns after the collector 1 collects the audio generated by knocking and transmits the electrical signal to the controller.

[0038] The movement of the lift table is controlled by collecting the knocking sound through the collector, which solves the problems of voice control and vibration control respectively; each collector has a certain effective collection range, and collectors are installed on the left and right parts of the table top, so that the effective collection range of all collectors covers the entire table top. When the user knocks on the table top at any position, the collector can effectively collect the knocking audio, making the control of the lift table more convenient and quick.

[0039] The control method of the lifting table is:

[0040] Taking the center line of the left and right directions of the table top as the boundary, at least one collector for collecting real-time audio signals is arranged on each of the left and right sides of the table top; the collectors on the left and right sides of the table top respectively collect the audio generated when the table top is knocked in real time, and compare the audio signal values ​​respectively collected by the collectors on both sides of the table top in the same time period. The larger audio signal value is the near-end signal value used to determine the knocking position; the near-end signal value is compared with the reference audio signal value. When the difference between the two is greater than the trigger threshold, the near-end signal value is determined to be a valid signal value;

[0041] A control signal is output according to the number of taps and / or the tapping position in combination with a predefined control method.

[0042] The utility model converts knocking into audio for collection, arranges collectors on the left and right sides of the table top to collect audio signals in real time, detects the occurrence of knocking, and determines the knocking position and whether it is an active and effective knocking when knocking, and then outputs a control signal according to the number of knocking times and / or the knocking position; the method realizes knocking detection in the entire table top range, and performs effective signal conversion to output control signals, freeing up restrictions on the knocking area, allowing users to more conveniently control the lifting of the lifting table, and the interaction is more convenient and user-friendly; and the knocking position can also be applied to the control method, and different movements can be achieved by determining different knocking positions, breaking the restriction that the movement of the lifting table can only be controlled by the number of knocking times, which is an ingenious idea that kills two birds with one stone.

[0043] The audio signal is in a waveform, and the signal value is the value of the peak; in a silent environment and in the presence of ambient noise, the reference audio signal value is different, the method for obtaining the reference audio signal value is also different, and the applicable trigger threshold is also different; specifically, when working in a silent environment, the collector collects the reference audio in silence, the reference audio signal value is the maximum value of the reference audio, and the difference between the near-end signal value and the reference audio signal value is greater than the first trigger threshold, which means that the near-end signal value is a valid signal value; the reference audio in a silent environment is relatively smooth and stable, and the reference audio value and the near-end signal value are not collected at the same time; due to the reference audio in a silent environment The amplitude of the seat audio is small, and it can even be assumed that the reference audio signal value at this time is approximately equal to zero; when there is environmental noise, the collected real-time audio is low-pass filtered to obtain a low-frequency denoised audio and use it as the reference audio; in the reference audio, the maximum signal value in the same time period as the near-end signal value is the reference audio signal value; the difference between the near-end signal value and the reference audio signal value is greater than the second trigger threshold, which means that the near-end signal value is judged to be a valid signal value; the collected real-time audio is subjected to noise reduction processing by low-pass filtering, thereby reducing the influence of environmental factors on the judgment of the valid signal value and ensuring the accuracy of control.

[0044] Furthermore, the method has multiple control modes. In this embodiment, two different control modes are exemplified. One is to determine the rise or fall according to the different knocking positions, and to determine the movement or stop according to the different knocking times. The other is to determine the rise, fall and stop according to the different knocking times regardless of whether the left side or the right side of the table top is knocked. Specifically, the first predefined control mode is to determine the rise or fall according to the different knocking positions, and to determine the movement or stop according to the different knocking times, and stipulates: Rise: When the collector located on the left side of the table top outputs a near-end signal value and receives two valid signal values, the table top enters the rising state, and the rising action stops automatically after rising to the top; Descent: When the collector located on the right side of the table top outputs a near-end signal value When the table top receives a valid signal value and receives two valid signal values, the table top enters the descending state, and the descending action automatically stops after descending to the bottom; Stop: During the movement of the table top, if a single valid signal value is received, the table top stops moving immediately; The judgment of the knocking position is added to the logic of the control method to distinguish between the rising action and the falling action. The same number of knockings at different knocking positions can also distinguish the rising and falling actions, breaking the limitation that the lifting table can only be controlled by the number of knockings, making the user's operation more convenient; and during the movement of the table top, a single knock at any position of the table top can stop the table top, making the lifting table more flexible and responsive to emergencies during the lifting process. The user can knock on the table top once at any position to stop the lifting table.

[0045] The second predefined control method is described in detail later.

[0046] like Figure 1 , 2 As shown in , 10, and 14, the arrangement of the collectors also plays an important role in effectively detecting the valid signal value generated by knocking within the entire table top. Three schemes are given in this embodiment. The first scheme is to arrange a collector at each of the four corners of the table top. When knocking at any position of the table top, the adjacent collector can clearly collect the audio signal. The adjacent collector can output the near-end signal value to determine the knocking position, and can also ensure that the near-end signal value can meet the requirement of the valid signal value, thereby preventing invalid operations caused by effective knocking errors and ensuring the accuracy of the operation.

[0047] like Fig.10 As shown, the second scheme is to divide the table top into four parts based on the midline of the left and right directions of the table top and the midline of the front and back directions of the table top, and arrange a collector at the center of each part, that is, set a collector at the intersection of the two diagonals of the four parts; in this scheme, the collector is arranged at the center of each part, that is, the collectors are evenly arranged on the table top, and can also collect audio signals in the entire table top range.

[0048] like Fig.14 As shown, the third solution is to set a collector at the midline position of the left and right parts. There are only two collectors, but they are enough to realize the percussion audio collection in the whole table range.

[0049] Furthermore, it is necessary to compare the audio signal values ​​collected by each collector. The comparison method is: when tapping at any position of the table, the audio signals collected by each collector in the same time period are different, such as Fig.11 As shown, by comparing the audio signal values ​​collected by each collector, when the largest audio signal value is output by the collector located on the right, it is judged as knocking on the right side of the table, and the audio signals of the other collectors are judged as invalid; similarly, when the largest audio signal value is output by the collector located on the left, it is judged as knocking on the left side of the table, and the audio signals of the other collectors are judged as invalid.

[0050] Furthermore, if Fig.13 As shown, the real-time audio signal is in a waveform. When the table top is knocked or a foreign object hits the table top, the waveform of the real-time audio signal will be greatly changed to generate an identification pulse; when the duration of the identification pulse is 50-120ms, it is determined that the identification pulse is emitted by knocking the table top; this scheme is used to filter abnormal vibrations, such as foreign objects falling on the table top; the audio signal supported by fingers and knocked has a narrow pulse width, that is, the duration is short, and the audio signal caused by foreign objects hitting the table top has a wide pulse width and takes a long time to reach a steady state, that is, the duration is long. The above scheme is used to identify whether the pulse is generated by knocking or by a foreign object impact. If the pulse is formed by a foreign object impact, it is invalid, thereby improving the accuracy of control.

[0051] Furthermore, the control method is to sample the waveform of the audio signal in a silent environment as follows: Figure 6 As shown in the figure, it basically remains stable along the time axis without much fluctuation. In actual work, the real-time audio corresponding to the knocking sound of the table is collected in real time. By knocking on the table twice with your fingers, two pulses with large peak values ​​can be obtained, such as Figure 6 As shown, the extreme value of this pulse is very large, and the interference signal caused by normal environmental noise and foreign objects on the desktop will not produce such a large pulse waveform. The real-time audio is compared with the waveform of the reference audio signal sampled in a silent environment. If the difference in the peak amplitudes of the two is greater than the first trigger threshold, it is determined to be a valid tapping behavior; the first trigger threshold can be set in the program based on actual conditions and multiple sampling experiments.

[0052] The normal frequency of human fingers knocking on objects, such as knocking three times in 1s when knocking on the door, is 3Hz. After testing, the frequency of people tapping on the table with their fingers is between 3.75 times per second and 5.66 times per second. If it is not within this frequency, it is considered a non-human knocking situation. In actual tests, the amplitude of each knock is not roughly the same. Due to the pain nerves of the human body, the human body will unconsciously reduce the strength of the second knock under the first gravity knock, resulting in the first knock being stronger than the second under normal knocking. Under normal knocking, the second knock is slightly lower than the first. In this case, when judging the audio signal value, if the amplitude value is greater than 75% of the first amplitude value, it is also considered to be a valid knock. This solution greatly improves the recognition rate of knocking.

[0053] Based on the above control method, a percussion audio acquisition control system is provided. Fig. 9 As shown, the system includes a collector 1 for receiving the knocking sound of the table top 16 and converting the knocking sound into an audio electrical signal;

[0054] A signal amplifier connected to the output end of the collector 1, the signal amplifier amplifies the audio electrical signal;

[0055] The controller, namely, MCU, is connected to the output end of the signal amplifier, and the controller outputs a control signal for controlling the action of the lifting column according to the effective knocking behavior;

[0056] The lifting column is used to perform corresponding lifting and stopping actions according to the control signal output by the controller.

[0057] Specifically, if Figure 7-8As shown, in actual use, there will inevitably be interference noise in the environment, so the collected audio needs to be denoised. For example, when there is an audio source on the desktop, the sound-conducting performance of the table board will interfere with the audio collection; when there is an audio source such as a speaker playing music on the desktop, the data collected by the collector, i.e., MIC, will have a lot of clutter, and the above detection method will fail. Therefore, a dual sensitivity method in different states is used to deal with the recognition rate problem in different environments. The envelope signal of the audio wave is detected by the algorithm, i.e., the upper envelope signal and the lower envelope signal. When the change value of the envelope signal is greater than a certain value and lasts for a period of time, it is considered that the current signal is unstable. In this state, the trigger threshold of the effective signal value needs to be changed accordingly to prevent misjudgment by clutter signals. When the change value of the envelope signal is less than a certain value and lasts for a period of time, it is considered that the current audio environment is stable, and then the trigger threshold of the effective signal value is changed accordingly. Therefore, the audio data of the tapping can be correctly identified in a complex environment without causing misjudgment.

[0058] When there is ambient noise, the real-time audio collected is S1, and the real-time audio S1 is low-pass filtered to obtain the pulse waveform of the low-frequency denoised frequency S2, that is, the pulse waveform of the reference audio; the peak value of the pulse waveform of the denoised frequency S2 (that is, the reference audio signal value) e2 is subtracted from the peak value of the pulse waveform of the real-time audio s1 (that is, the near-end signal value) e1, and the obtained two Se are compared with the second trigger threshold. If Se is greater than the second trigger threshold, it is determined that the near-end signal value is a valid signal value, and the knocking behavior is a valid knocking behavior. At the same time, it is also necessary to compare the audio signal values ​​collected by each collector.

[0059] A further example is as follows: This solution uses a collector MIC, which outputs an analog audio signal. The MCU of this solution adopts a 32-bit ARM architecture, is programmed in C language, and supports assembly.

[0060] The data output by the collector is sampled by the main control chip using ADC, with a sampling accuracy of 12 bits and a sampling frequency of 20K. This sampling rate can collect most of the frequency bands of audio that can be heard by the human ear. The signal amplifier uses a high-gain audio signal amplifier to amplify the original signal of the audio mic and then transmit it.

[0061] The master end, that is, the controller, completes a sampling cycle every 10ms and stores the sampled data within the cycle in the chip memory. The collected data is S_raw; the master end extracts the maximum and minimum values ​​of the data within 10ms, which are S_min and S_max respectively;

[0062] That is, S_min = MIN(S_raw); S_max= MAX(S_raw);

[0063] For the calculated S_min and S_max signals, the signals of each calculation cycle are connected together as the original sampling signal and can also be regarded as the real-time audio signal S1; the data of each sampling cycle is low-pass filtered to obtain the denoised signal S2 of the original sampling signal waveform; the low-pass frequency is set to 50Hz, and the low-pass calculation cycle is 10ms.

[0064] S2=LPF(S1, 50, 0.01); Since the low-pass characteristic will filter out high-frequency signals, when a knock occurs, the signal with a sharp change in signal amplitude will be filtered out, so the waveform amplitude of S2 will change slightly, and the waveform amplitude of S1 will change greatly. Using this difference, calculate the absolute value Se of the difference between S1 and S2, Se = |S1 - S2|; When Se is greater than the second trigger threshold, the knock is considered to be a valid knock, and the near-end signal value generated by the knock is considered to be a valid signal value;

[0065] Likewise, the second trigger threshold can be set in the program in combination with actual conditions and multiple sampling experiments.

[0066] In a single operation, when a valid signal value is received, the time value at this time is recorded, recorded as Tn, and the unit of Tn is ms; the time difference between two valid signal values ​​is recorded as Te, Te= Tn-Tn-1; when the value of Te is between 180ms and 320ms, it is deemed to be the normal finger tapping cycle, and then the tapping count is performed, recorded as Tx; Te satisfies Te>= 180 and Te<= 320; if Te is greater than 320ms, it is considered that the tapping is not continuous, and Tx is cleared, Tx = 0; when Tx = 2, the table top rises; when Tx = 3, the table top falls; when Tx>3, there is no action; when the table top is rising or falling, when it taps the table top once, the table top stops.

[0067] Furthermore, the rising of the table top 16 is a more frequent operation. When the user adjusts the height of the table top 16 multiple times, most of the time he wants the table top 16 to rise, so tapping twice is used as a control method for raising the table top 16. When two valid tapping audios are received, the table top 16 enters an ascending state, and the ascending action automatically stops after rising to the top. When three valid tapping audios are received, the table top 16 enters a descending state, and the descending action automatically stops after descending to the bottom. Stopping the table top 16 is a safe function that requires a quick response, so the most convenient and fastest operation method is left to the stop function. When the table top 16 is in an ascending state or a descending state, before the ascending or descending action ends, if a single valid tapping audio is received, the desktop immediately stops ascending or descending.

[0068] Further, such as Figure 3-5As shown, the installation method of the collector 1 is particular, mainly to isolate external noise as much as possible to improve the accuracy of the collected knocking; first, the collector 1 is integrated and installed in a cap-shaped mounting seat 2, and a cavity 3 is provided inside the mounting seat 2. The outer edge of the overall contour of the collector 1 is also circular. Specifically, the collector 1 is a microphone sensor, which includes a circuit board 5 and a microphone 4 connected thereto. A sound insulation member is pre-placed on the inner wall of the cavity 3. The sound insulation member can be made of double-layer silicone to prevent interference from external noise. A convex rib 11 is convexly provided on the inner wall of the cavity of the mounting seat 2, and a notch 12 is correspondingly provided on the circuit board 5. When the circuit board 5 sinks into the cavity 3, the convex rib 11 is inserted into the notch 12, so that the circuit board 5 remains circumferentially fixed. The outer edge of the collector 1 fits with the inner wall of the mounting base 2. The collector 1 includes a microphone 4 and a circuit board 5. The end of the mounting base 2 close to the microphone 4 is a sound pickup end 6, and the end of the mounting base 2 close to the circuit board 5 is a bottom end 7. The sound pickup end 6 is open to form an open end 9 of the mounting base, and a sound pickup hole 8 is opened on the end cover 10 at the open end 9. The number of the sound pickup holes 8 is one or more, and the shape is any shape such as a circle, a triangle, etc.

[0069] Furthermore, Figure 4-5 As shown, the open end 9 of the mounting base is circular in shape, and the open end 9 connects the inside of the cavity 3 with the outside of the mounting base 2. A circular end cover 10 is provided at the open end 9, and the diameter of the end cover 10 is consistent with the diameter of the edge of the open end 9. The pickup hole 8 is located on the end cover 10. A convex rib 11 is convexly provided in the cavity 3 of the mounting base 2, and a notch 12 is provided on the circuit board 5 corresponding to the convex rib 11. During assembly, the circuit board 5 of the collector 1 is sunk toward the cavity 3 and directly inserted from the open end 9. The notch 12 and the convex rib 11 slide relative to each other. After installation, the end cover 10 is covered on the open end 9 to complete the assembly.

[0070] Furthermore, if Figure 4-5 As shown, the convex rib 11 does not extend to the open end 9, so that the upper end of the convex rib 11 sinks to avoid it. In this way, when the end cover 10 covers the open end 9, the lower end of the end cover 10 abuts against the upper edge of the convex rib 11; that is, the distance from the upper edge of the convex rib 11 to the open end 9 is equal to the thickness of the end cover 10. The end cover 10 is stuck in the open end 9 and placed on the convex rib 11. The convex rib 11 not only limits the circumferential position of the circuit board, but also supports the end cover 10, killing two birds with one stone. The distance from the upper edge of the convex rib to the open end is equal to the thickness of the end cover, so that after the end cover is put in place, the overall upper end surface of the mounting seat is flat, and after the end cover closes the open end, it is ensured that only the sound pickup hole collects sound.

[0071] Furthermore, the outer edge of the upper end of the mounting seat 2 protrudes outward to form a connecting portion 13, so that the open end 9, the end cover 10 and the connecting portion 13 form a flat surface. The connecting portion 13 can be an annular body integrally formed on the outer edge of the upper end of the mounting seat, and two or three connecting holes 14 are opened on the connecting portion 13, such as Figure 3 As shown, the bottom end 7 of the mounting base 2 is provided with a socket 15 for power supply or signal transmission, and the socket 15 may be a USB connection port, or it may be said that it is an interface for interaction provided by the percussion audio collection device.

[0072] Further, on the bottom surface of the table top 16, Figure 1 Or the position shown in 10 forms a placement position, the bottom surface of the table is flat, and the collector 1 is installed in the placement position on the bottom surface of the table. Before installation, a layer of spacer 18 can be placed between the end cover 10 and the bottom surface of the table. The spacer 18 can be a rubber ring or sound insulation cotton, which will not block the sound pickup hole, so that the device can still receive the knocking vibration signal from the table 16 through the sound pickup hole 8, avoiding the interference caused by the overall shaking of the table, making the installation more stable, and the vibration signal from the external environment has been blocked by the spacer 18. Figure 4 The state where the spacer 18 is a sound insulation cotton is shown. Figure 5 The state where the spacer 18 is a rubber ring is shown.

[0073] The above hardware installation method stores the collector in the mounting seat, and the upper open end is blocked by the end cover, so as to form an integral installation module, which is conducive to standardized installation and assembly. The end cover seals the collector in the cavity, and one or more sound pickup holes are left on the end cover, so that the sound can only be transmitted from the sound pickup holes, reducing the interference caused by environmental factors. At the same time, the structure of the device is simple, and the manufacturing difficulty and cost are low; it ensures the qualified rate of mass-produced finished products and product accuracy, and improves user satisfaction.

[0074] Specifically, the collector is placed in the cavity of the mounting base with the circuit board facing downward and the microphone facing the pickup end of the end cover with the pickup hole. This limits the sound to be transmitted only from the direction of the pickup hole. The sound collection has high accuracy and strong anti-interference ability. It can be used even in noisy environments and does not need to cover the entire desktop like pressure plate control. The cost is low, the overall product is modular, and is less affected by the specifications of the matching products themselves. It is suitable for large-scale production of the same specifications. In actual use, you only need to knock on the desktop, and the knocking vibration sound will be collected by the collector, and then the signal transmission and conversion can complete the lifting and lowering. The user can perform convenient operations while continuing to work with both hands.

[0075] Finally, if Fig.12 As shown, in the first control mode, the steps of the control method are:

[0076] Step 1: Knock on the table;

[0077] Step 2 Controller judgment:

[0078] Step 2-1 Determine the near-end signal value: Compare the audio signal values ​​collected by each collector. If the difference between the audio signal values ​​of the collectors on both sides is less than the positioning threshold, the tapping is invalid; if the difference between the audio signal values ​​of the collectors on both sides is greater than the positioning threshold, the maximum audio signal value is the near-end signal value;

[0079] Step 2-2 Compare the trigger threshold: Compare the difference between the near-end signal value and the reference audio signal value to see if it is greater than the trigger threshold. If the difference between the two is less than the trigger threshold, it is determined to be invalid; if the difference between the two is greater than the trigger threshold, it is determined to be moving or stopped;

[0080] Step 2-3 Determine whether to move or stop: Determine whether to move or stop by the number of valid signal values; if the number of valid signal values ​​is 1, the lifting table is controlled to stop moving; if the number of valid signal values ​​is 2, continue to determine whether to rise or fall;

[0081] Step 2-4 Determine whether to rise or fall: Set the left side of the table top as the rising trigger area and the right side of the table top as the falling trigger area. If the collector that outputs the near-end signal value is located on the left side of the table top, the lifting table is controlled to rise; if the collector that outputs the near-end signal value is located on the right side of the table top, the lifting table is controlled to fall.

[0082] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A lifting table, characterized in that: It includes a table top, a controller and two lifting columns, the two lifting columns are arranged at intervals on the left and right, and the table top is set on the two lifting columns; the table top is divided into a left part and a right part by the center line in the left and right directions, and the left part and the right part are each provided with at least one collector, the collector is electrically connected to the controller, and the controller is electrically connected to the lifting columns; the collector is configured to collect audio in real time and transmit it to the controller in the form of electrical signals; the controller is configured to control the movement of the lifting columns after the collector collects the audio generated by knocking and transmits the electrical signal to the controller.

2. The lifting table according to claim 1, characterized in that: There are two collectors, which are respectively arranged at the center of the left and right parts.

3. The lifting table according to claim 1, characterized in that: There are four collectors in total, and the four collectors are respectively set at the four corners of the table.

4. The lifting table according to claim 1, characterized in that: There are four collectors in total. The table top is divided into four parts by the midline in the left-right direction and the midline in the front-back direction. The four collectors are respectively arranged at the intersection of the two diagonals of each part.

5. The lifting table according to claim 1, characterized in that: A placement groove is provided on the table top, a mounting seat with a cavity is provided in the placement groove, the collector is arranged in the cavity of the mounting seat, and is mounted on the table top through the mounting seat.

6. The lifting table according to claim 5, characterized in that: A sound insulation piece is arranged inside the cavity to block external noise.

7. The lifting table according to claim 5, characterized in that: The collector is wrapped with sound insulation.

8. The lifting table according to claim 1, characterized in that: The collector is a microphone sensor.

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