Digital slide trumpet
Patent Information
- Application Number
- CN202611412065.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-11
- Publication Date
- 2026-10-20
AI Technical Summary
2.传统长号依赖唇部肌肉与气息的复杂配合控制音准，本发明气压与音量映射，使吹奏者只需操作拉管即可稳定输出目标音高，无需专业唇振训练，降低了吹奏难度。
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Abstract
Description
Technical Field
[0001] This invention primarily relates to the field of trombone instruments, while also incorporating digital technology. Background Technology
[0002] Traditional musical instruments rely on their own physical properties, such as structure and materials, to produce sound. The traditional trombone, a typical brass instrument, mainly consists of a mouthpiece, tuning tube, bow tube, and bell. The trombone has no keys; its intonation depends entirely on the player's precise control of the bow tube position and the coordination of lip muscles, making it widely recognized as the most difficult brass instrument to control in terms of intonation. The player changes the effective length of the tube (the effective air column) by pushing and pulling the bow tube, creating seven characteristic positions. Each position corresponds to a fundamental pitch, and through lip vibration and breath control, multiple overtones can be generated, achieving the expression of pitch and timbre. Breath control requires precise adjustment of airflow, pressure, and velocity to match pitch, volume, and timbre requirements, especially maintaining stable air pressure when pushing and pulling the bow tube to ensure a continuous sound. Subtle changes in embouchure tension directly affect the brightness and pitch of the tone. This invention utilizes digital technology to integrate optoelectronic devices and sensors while maintaining the traditional appearance of the trombone. This solves the problems of difficult pitch control and the need for the arm to pull the tube in perfect sync with the embouchure and breath, greatly simplifying the difficulty of playing the trombone. Summary of the Invention
[0003] To achieve the above objectives, the present invention provides a digital trombone with a lever, comprising a mechanical part and an electronic part; The mechanical parts are responsible for simulating the shape of a traditional trombone, including the mouthpiece assembly, telescopic tube assembly, and trumpet assembly; The mouthpiece assembly is used to receive the airflow blown by the player; The telescopic tube assembly includes an inner tube, an outer slide tube, an outer slide tube crossbeam, a limiting device, and other accessories. The inner tube and the outer slide tube are nested, and the outer slide tube can be pushed and pulled. When the outer slide tube slides, it has several preset relative positions of the inner tube and the outer slide tube. Each preset position corresponds to a reference pitch in trombone playing. These preset positions are the positions. The limiting device prevents the outer slide tube from stretching further when it is stretched to its longest length, thus playing a limiting role. One end of the horn assembly is connected to the telescopic tube assembly, and the other end is in the shape of a large conical horn. The electronic components include a control module, a finger position detection module, a playing information acquisition module, a button module, a sound source module, a sound generation module, and a power supply module; The control module is used for system control and coordination. The pull tube position detection module is responsible for detecting the position of the handle and generating a corresponding position signal to send to the control module; The playing information acquisition module collects the playing information of the player and sends it to the control module; The button module includes several buttons for outputting control signals, including at least power on / off commands and volume adjustment commands. The sound source module is responsible for storing audio data and outputting audio signals of corresponding pitches according to the instructions of the control module; The sound-generating module is located in the speaker assembly and is used to convert audio signals into sound output; The power module is used to power the entire instrument; The control module extracts the corresponding audio data from the sound source module based on the received pipe position signal and playing information, and controls the sound output module to play it.
[0004] In one implementation scheme, the pull tube position detection module includes at least one laser transceiver and at least one color block. The current position is identified by detecting the reflectivity of the laser light illuminating the color block. There are two specific installation methods: Method 1: The laser transceiver is installed on the outer sliding tube; the color blocks are sprayed at intervals along the axial direction of the inner tube on the surface of the inner tube, each color block having a different color and reflectivity. The laser transceiver emits laser light from the outer sliding tube towards the inner tube. As the outer sliding tube slides, the inner and outer sliding tubes shift relative to each other, changing the relative position between the laser transceiver and the color blocks. The laser light emitted by the transceiver sequentially irradiates different color blocks, causing distinguishable changes in the reflected light signal. The reflected light signal is received by the laser transceiver. Since there is a one-to-one correspondence between the reflectivity and the color block, the currently irradiated color block can be identified by detecting the reflectivity, thus determining the current position of the pull tube. Method 2: The laser transceiver is installed at intervals along the axial direction of the inner tube on the inner tube; at least one color block is sprayed on the inner wall of the outer sliding tube. When the outer slide tube slides to a certain position, the laser transceiver corresponding to that position is facing the color block. The reflected light signal received by the transceiver is different from that of other laser transceivers, thus determining the current position.
[0005] It should be noted that in the above color-based recognition scheme, the color blocks are not limited to the identification method of a single color corresponding to a single hand position. As an extended encoding form of this scheme, referring to the hole position encoding principle described below, multiple color blocks can be combined into a group according to a preset arrangement. By utilizing the different arrangement orders of each color block and their corresponding reflectivity differences, a composite reflection sequence is formed, thereby deriving multiple combination codes within a limited space to uniquely distinguish the various hand positions of the trombone. This combination encoding logic is consistent with the principle of the hole position-based encoding scheme described below.
[0006] In another implementation, the pull tube position detection module includes a set of laser transceivers and a group of coded holes on the inner tube. The set of laser transceivers is fixedly installed on the outer sliding tube and slides synchronously with it. The inner tube has multiple groups of coded holes spaced apart along its axial direction. Each group of coded holes corresponds to a position on the trombone. Each group of coded holes is a detection position arranged along the axial direction of the inner tube, and has different laser reflection characteristics depending on whether it has a hole, thus forming a binary coding sequence. Each laser transceiver corresponds one-to-one with each detection position. When the outer sliding tube slides, the laser emitted by each laser transceiver illuminates each detection position of the group of coded holes corresponding to the current position, generating different combinations of reflected light signals based on whether there is a hole or not. The control module receives and decodes this signal combination to uniquely identify the current position. By pre-setting multiple sets of different coded hole combinations on the inner tube, each corresponding to a different position on the trombone, this scheme uses hole coding instead of color recognition.
[0007] The corresponding position markings are labeled with solfège syllables, in the order of "high 1, 7, 6, 5, 4, 3, 2, 1", corresponding to the eight positions of the trombone. The reference pitches corresponding to each position marking are C′, B, A, G, F, E, D, C, indicating the current position of the trombone and its corresponding reference pitch. The playing information acquisition module is located in the mouthpiece assembly and has a built-in air pressure sensor. It can sense the pressure of the breath blown by the player in real time, convert it into an electrical signal, and transmit it to the control module for processing to control the volume and duration of the played notes.
[0008] The control module synchronously receives the position signal from the pipe position detection module and the air pressure parameters from the playing information acquisition module. Based on the reference pitch corresponding to the current position, it determines the note number of the target pitch, retrieves the corresponding audio data from the sound source module, adjusts the volume and playback duration in combination with the air pressure parameters, synthesizes the audio signal, and drives the sound output module to output sound.
[0009] The button module is connected to the control module. The button module includes a power button, volume control buttons, transposition buttons, octave up and octave down buttons, and semitone up buttons. The transposition button is used to trigger a transposition command. The control module defaults to C major as the reference key and shifts the reference pitch corresponding to the current position signal by a preset number of semitones according to the transposition command. When the transposition button is triggered once, the reference pitch is raised by 1 semitone (i.e., C major becomes C#), generating the transposed target pitch. When the octave up and octave down buttons are triggered, the control module shifts the reference pitch corresponding to the current position signal up or down by one octave (12 semitones). When the octave up and octave down buttons are pressed simultaneously, a sustain effect is triggered. When the semitone up button is triggered, the control module shifts the current reference pitch up by one semitone. When any two or more of the above commands are triggered simultaneously, the control module accumulates the offsets corresponding to each command to generate the composite shifted target pitch. Beneficial effects
[0010] 1. Traditional appearance, digital core, expandable to other musical instruments; 2. Traditional trombones rely on the complex coordination of lip muscles and breath to control pitch. This invention maps air pressure and volume, allowing the player to stably output the target pitch simply by operating the tube, without the need for professional lip vibration training, thus reducing the difficulty of playing.
[0011] 3. The position detection is achieved through laser reflection, which has high accuracy and strong anti-interference ability. The player only needs to push or pull the tube to the corresponding position and blow air to stably output the target pitch, which completely solves the problem of pitch deviation caused by lip vibration and breath changes in traditional trombones.
[0012] 4. Marking solfège syllables, as well as one-click transposition and semitone raising functions, make playing easier, facilitate harmony and musical notation, and are simple and easy to learn. Attached Figure Description
[0013] Figure 1 This is a system architecture block diagram of a digital trombone according to this embodiment.
[0014] Figure 2 This is a schematic diagram of the structure of a digital pull rod trombone in this embodiment.
[0015] Figure 3 This is a schematic diagram of the installation of a laser transceiver device for a digital trombone pull tube position detection module in this embodiment.
[0016] Figure 4 This is another alternative implementation scheme of this embodiment. Detailed Implementation
[0017] To achieve the above objectives, the present invention is implemented through the following technical solution: like Figure 1 As shown, the system architecture of the digital lever trombone of this invention includes a control module, a lever position detection module, a button module, a playing information acquisition module, a sound source module, a sound generation module, and a power supply module.
[0018] The finger position detection module sends the detected finger position signal to the control module; the playing information acquisition module sends the acquired air pressure signal to the control module. The button module sends the user's operation commands to the control module. The button module includes a power button, volume control buttons, transpose buttons, octave up buttons, octave down buttons, and semitone up buttons. The transpose buttons trigger transpose commands. The control module defaults to C major and, based on the transpose command, shifts the reference pitch corresponding to the current position signal by a preset number of semitones (e.g., triggering one semitone shifts the pitch, i.e., C major becomes C#), generating the transposed target pitch. The octave up and octave down buttons trigger octave up / down commands. Based on these commands, the control module shifts the reference pitch corresponding to the current position signal up or down by one octave (12 semitones). Pressing both buttons simultaneously triggers a sustain effect. The semitone up button triggers a semitone up command. Based on this command, the control module shifts the current reference pitch up by one semitone. When any two or more of the above commands are triggered simultaneously, the control module accumulates the offsets corresponding to each command to generate the composite shifted target pitch. The control module retrieves the corresponding timbre data from the sound source module based on the received position signal, air pressure signal, and button commands. It then adjusts the overall pitch shift according to the transposition command, and adjusts the output loudness in conjunction with the volume control command. After internal synthesis processing, the audio signal is output to the sound-generating module for playback. The power module supplies power to all modules.
[0019] like Figure 2 As shown, the digital trombone of this embodiment includes a mechanical part and an electronic part; The mechanical parts are responsible for simulating the shape of a traditional trombone, including the mouthpiece assembly 10, the telescopic tube assembly 20, and the trumpet assembly 30; The mouthpiece assembly 10 is responsible for receiving the blown airflow from the player. The telescopic tube assembly 20 includes an inner tube 21, an outer slide tube 22, an outer slide tube crossbeam 23, an inner tube support crossbeam 24, a limiting device, and other accessories. The inner tube 21 and the outer slide tube 22 are nested together. The outer slide tube 22 can be pushed and pulled. When the outer slide tube 22 slides, it has several preset relative positions of the inner and outer slide tubes. Each preset position corresponds to a reference pitch in trombone playing. These preset positions are the positions. One end of the horn assembly 30 is connected to the telescopic tube assembly 20, and the other end is in the shape of a large conical horn. The electronic part includes a control module and a sound source module integrated on the same control circuit board 1, which is fixed in the middle of the horn assembly 30. The button module 2 is located inside the inner tube support beam 24. The playing information acquisition module 3 is located at the end of the mouthpiece assembly 10. The sound generation module 4 is located at the end of the horn assembly 30. The power module 5 is fixed near the control circuit board 1. The limiting device includes a first limiting part 25 located on the outer wall of the inner tube and a second limiting part 26 located on the inner wall of the outer sliding tube.
[0020] The mouthpiece assembly, telescopic tube assembly, and horn assembly constitute the appearance of a traditional trombone. The control module, sound source module, button module, playing information acquisition module, sound generation module, and power supply module are integrated and installed inside the outer shell, forming a smart musical instrument that combines the charm of traditional playing with digital control functions.
[0021] As one embodiment of this invention, the tube pulling position detection module consists of a laser transceiver 40 and an eight-color block combination 41. The laser transceiver 40 is installed inside the outer sliding tube crossbeam 23, and its partially enlarged structure is shown in [reference]. Figure 3 .
[0022] The digital trombone has a similar overall shape to a traditional trombone. The trombone assembly includes an inner tube 21, an outer slide tube 22 that is fitted over the inner tube 21 and can slide relative to it, and an outer slide tube crossbeam 23 fixedly connected to the outer slide tube 22. The outer surface of the inner tube 21 is sprayed with multiple colored blocks 41 at intervals along its axial direction. There are eight colored blocks 41, each corresponding to one of the eight positions on the trombone, with solfège markings of "high 1, 7, 6, 5, 4, 3, 2, 1" along the axial direction of the inner tube for visual reference by the player. Each position corresponds to a reference pitch. The colors of the colored blocks 41 are different to produce different reflectivities for laser light. A laser transceiver 40 is fixedly installed in the cavity inside the outer slide tube crossbeam 23 of the outer slide tube 22, with both its transmitting and receiving ends facing the inner tube 21. When the player pushes or pulls the outer slide tube crossbeam 23, the outer slide tube 22 causes the laser transceiver 40 to slide along the axial direction of the inner tube 21. The laser transceiver 40 continuously emits a laser beam. When the laser beam irradiates the surface of a certain color block 41, the intensity of the reflected light signal generated by different colors is different. The laser transceiver 40 generates a corresponding position electrical signal based on this and transmits it to the control module through the signal line.
[0023] After receiving the position signal, the control module determines the target pitch based on the reference pitch corresponding to the current position. The eight positions correspond sequentially to the reference pitches C', B, A, G, F, E, D, and C along the inner tube 21. Simultaneously, the control module determines the volume and playing duration based on the air pressure detected by the air pressure sensor, retrieves the corresponding audio data from the sound source module, and synthesizes an audio signal by combining it with the air pressure parameters to drive the sound-producing module 4 to produce sound.
[0024] For example, pushing the tube to the innermost first position and blowing produces a C note; pulling it out to the second position and blowing produces a B note; and so on, pulling it out to the third, fourth, fifth, sixth, seventh, and eighth positions and blowing produces A, G, F, E, D, and C notes respectively. The player only needs to push or pull the tube to the corresponding position and blow to accurately produce the target pitch. Pressing the octave raise or lower key raises or lowers the pitch by one octave per press. Stopping blowing stops the sound production.
[0025] The inner tube is marked with position marks corresponding to each position. The position marks are arranged in order along the axial direction of the inner tube as solfège syllables "high 1, 7, 6, 5, 4, 3, 2, 1", which correspond to the eight positions of the trombone instrument. The reference pitches corresponding to each position mark are, in order, the note names C', B, A, G, F, E, D, C. The position marks are set in the area where the color block is located or in the vicinity, and are used to indicate the position number of the current pipe position and its corresponding reference pitch.
[0026] from Figure 3 The specific structure of the limiting device can also be seen: the outer wall of the inner tube (21) is provided with a first limiting part (25), and the inner wall of the outer slide tube (22) is provided with a second limiting part (26) at the corresponding position, which is used to limit the maximum sliding stroke of the outer slide tube. In this embodiment, the first limiting part (25) is a ring of outward protrusions processed around the outer wall of the inner tube (21) near the end; the second limiting part (26) is a ring of inward protrusions processed around the inner wall of the front end of the outer slide tube (22). The two protruding installation positions are reserved with sufficient room for movement. The slide tubes do not contact each other during the entire sliding process from position one to position eight, and do not affect the smoothness of the slide tubes. When the player pulls the outer slide tube to position eight, the second limiting part (26) on the inner wall of the outer slide tube just makes face contact with the first limiting part (25) on the outer wall of the inner tube and locks each other, accurately limiting the maximum sliding stroke of the outer slide tube. Without changing the original slide tube detection structure or damaging the traditional trombone operating feel, the problem of the outer slide tube completely coming off the inner tube is completely avoided.
[0027] As an alternative, see Figure 4The pull tube position detection module consists of eight laser transceivers 40 and one color block assembly 41, which are fixedly installed on the inner tube 21 at intervals along the axial direction, corresponding to the eight positions respectively; the inner wall of the outer sliding tube 22 is sprayed with a color block 41. When the pull tube slides, the color block 41 moves with the outer sliding tube 22. The laser of the laser transceiver 40 of the current position can illuminate the color block 41 and receive the reflected signal, which will be significantly different from the signal received by other laser transceivers, thereby identifying the position.
[0028] As another specific alternative embodiment of the present invention, the pull tube position detection module consists of three laser transceivers and eight sets of coded holes. It eliminates the need for paint blocks, relying entirely on the difference between physical hole positions and laser reflectivity to identify the position. Three laser transceivers are provided, which can be referred to as the first, second, and third laser transceivers for easy distinction. These three laser transceivers are fixedly installed at equal intervals along the inner tube axis in the cavity inside the outer slide tube crossbeam, and are all installed on the same straight line. The transmitting and receiving ends of each laser transceiver face the inner tube, and the adjacent spacing between the three laser transceivers is equal, denoted as a fixed value d. When the player pushes or pulls the outer slide tube crossbeam, the three laser transceivers slide synchronously along the inner tube axis along with the outer slide tube and the outer slide tube crossbeam, and their relative positions remain constant. Eight sets of coded holes are sequentially arranged along the axial direction of the inner tube's outer wall. The spacing between adjacent sets of coded holes is consistent with the physical travel distance between adjacent positions. Each group of coded holes consists of three detection positions arranged axially. The spacing between adjacent detection positions within the same group is a fixed value d, and the positions of the three detection positions in the group correspond one-to-one with the positions of the three laser transceivers. Specifically, when the outer slide tube slides to a certain position, the first laser transceiver is positioned at the first detection position in the group of coded holes, the second laser transceiver at the second detection position, and the third laser transceiver at the third detection position. Each detection position exhibits different laser reflection characteristics depending on whether it has a through hole penetrating the inner tube wall. Where there is no hole, the outer wall surface of the inner tube remains intact and flat, resulting in high laser reflectivity. Where there is a hole, the increased distance between the laser and the tube, along with the difference in space and curvature between the inside and outside of the tube, causes scattering when the laser irradiates the edge and interior of the hole, significantly reducing the reflectivity. Therefore, each detection position can output one of two states: a high reflectivity state and a low reflectivity state. A set of coded holes contains three detection bits, and each detection bit independently takes one of two states. Therefore, a set of coded holes can form a total of eight different three-bit combination codes, which correspond exactly to the eight positions of the trombone.
[0029] The outer slide tube is stretched from its overlap with the inner tube to the limiting stop, dividing the position into the first to eighth positions. The coding relationship of each position is as follows. The first position corresponds to the solfège high 1, with a reference pitch of C′. All three detection positions in its coding hole have through holes. The reflected light signals received by the three laser transceivers are all low reflectivity, forming a three-bit code 111. In this code, the binary bit "1" indicates low reflectivity (i.e., the detection position has a through hole), and the binary bit "0" indicates high reflectivity (i.e., the detection position does not have a hole).
[0030] The second position corresponds to solfège 7, with a reference pitch of B. The first and second detection positions in its encoding hole have through holes, while the third detection position has no hole. The reflected signals are low, low, and high, forming a three-bit code 110.
[0031] The third position corresponds to solfège 6, with a reference pitch of A. The first and third detection positions in its encoding hole have through holes, while the second detection position has no hole. The reflected signals are low, high, and low, respectively, forming a three-bit code 101.
[0032] The fourth position corresponds to solfège 5, with a reference pitch of G. The first detection position in its encoding hole has a through hole, while the second and third detection positions do not have holes. The reflected signals are low, high, and high, respectively, forming a three-bit encoding of 100.
[0033] The fifth position corresponds to solfège 4, with a reference pitch of F. The first detection position in its encoding hole is not open, while the second and third detection positions are both open. The reflected signals are high, low, and low, respectively, forming a three-bit code 011.
[0034] The sixth position corresponds to solfège 3, with a reference pitch of E. The first and third detection positions in its encoding hole are not open, while the second detection position has a through hole. The reflected signals are high, low, and high, respectively, forming a three-bit code 010.
[0035] The seventh position corresponds to solfège 2, with a reference pitch of D. The first and second detection positions in its encoding hole are not open, while only the third detection position has a through hole. The reflected signals are high, high, and low, forming a three-bit code 001.
[0036] The eighth position corresponds to solfège 1, with a reference pitch of C. None of the three detection positions of its encoding hole have through holes, and the reflected light signals received by the three laser transceivers are all highly reflective, forming a three-bit code 000.
[0037] During the inner tube processing, it is only necessary to drill or not drill through holes at the corresponding detection positions of each handle according to the above coding relationship. After all the coded holes are processed, the outer wall of the inner tube does not need to be painted with any color.
[0038] When the performer pushes or pulls the outer slide tube crossbeam, the three laser transceivers fixed inside the crossbeam slide synchronously along the inner tube axis. When the outer slide tube is pushed or pulled to a preset position, the three laser transceivers are precisely positioned at the first, second, and third detection positions in a set of coded holes corresponding to that position. At this moment, the three laser transceivers simultaneously emit lasers, each illuminating its corresponding detection position, and receive the reflected light signals returned from the detection positions.
Claims
1. A digital trombone with a lever, characterized in that, Includes mechanical and electronic components; The mechanical parts are responsible for simulating the shape of a traditional trombone, including the mouthpiece assembly, telescopic tube assembly, and trumpet assembly; The mouthpiece assembly is used to receive the airflow blown by the player; The telescopic tube assembly includes an inner tube, an outer slide tube, an outer slide tube crossbeam, a limiting device, and other accessories. The inner tube and the outer slide tube are nested, and the outer slide tube can be pushed and pulled. When the outer slide tube slides, it has several preset relative positions of the inner tube and the outer slide tube. Each preset position corresponds to a reference pitch in trombone playing. These preset positions are the positions. The limiting device prevents the outer slide tube from stretching further when it is stretched to its longest length, thus playing a limiting role. One end of the horn assembly is connected to the telescopic tube assembly, and the other end is in the shape of a large conical horn. The electronic components include a control module, a finger position detection module, a playing information acquisition module, a button module, a sound source module, a sound generation module, and a power supply module. The control module is used for system control and coordination. The pull tube position detection module is responsible for detecting the position of the handle and generating a corresponding position signal to send to the control module; The playing information acquisition module collects the player's air pressure signal and sends it to the control module; The button module includes several buttons for outputting control signals, including at least power on / off commands and volume adjustment commands. The sound source module is responsible for storing audio data and outputting audio signals of corresponding pitches according to the instructions of the control module; The sound-generating module is located in the speaker assembly and is used to convert audio signals into sound output; The power module is used to power the entire instrument; The control module extracts the corresponding audio data from the sound source module based on the received tube position signal and air pressure signal, and controls the sound generation module to play it.
2. The digital trombone with a pull handle according to claim 1, characterized in that, The pull tube position detection module is composed of a laser transceiver and a color block, or a laser transceiver and an encoding hole group; the number of laser transceivers is one or more; the color block or encoding hole group has one or more distinguishable states, such that each position corresponds to a set of reflected light signals detected by each laser transceiver, and the control module determines the position of the pull tube by identifying the combination.
3. A digital trombone with a pull handle according to claim 2, characterized in that, The pull tube position detection module includes at least one laser transceiver and at least one group of coded holes. The group of coded holes is set on the inner tube and has multiple groups of coded holes along the axial direction. Each group of coded holes corresponds to a position. Each group of coded holes is a detection position arranged along the axial direction of the inner tube. Depending on whether there is an opening, they have different laser reflection characteristics, forming a binary coding sequence. Each laser transceiver receives the reflected light signal of each detection position. The control module obtains the current position by decoding the combination of the detected reflected light signals.
4. A digital trombone with a pull rod according to claim 2, characterized in that, The tube pull position detection module includes at least one laser transceiver and at least one color block. The laser transceiver is mounted on the outer sliding tube. The color blocks are sprayed at intervals on the surface of the inner tube along the axial direction of the inner tube. Each color block or a group of colors corresponds to a position. The colors of the color blocks are different and the light reflectivity is different. The laser transceiver emits laser light from the outer sliding tube towards the inner tube. As the outer sliding tube slides, the inner and outer sliding tubes undergo relative displacement, which means that the relative position between the laser transceiver and the color block changes. The laser light emitted by the laser transceiver sequentially illuminates different color blocks, causing the reflected light signal to produce distinguishable characteristic changes. The reflected light signal is received by the laser transceiver. Since the light reflectivity corresponds one-to-one with the color block, the currently illuminated color block can be identified by detecting the light reflection intensity, thereby determining the current position.
5. A digital trombone with a pull rod according to claim 2, characterized in that, At least one laser transceiver is installed at intervals along the axial direction of the inner tube, with each laser transceiver or group of laser transceivers corresponding to a handle position. A color block is sprayed onto the inner wall of the outer sliding tube. The at least one laser transceiver emits laser light from the inner tube towards the outer sliding tube, and each laser transceiver receives the reflected light signal. The installation positions of the multiple laser transceivers on the inner tube correspond one-to-one with the handle positions. When the outer sliding tube slides to a certain handle position, the color block sprayed on the inner wall of the outer sliding tube will be directly opposite the laser transceiver at that handle position. The laser emitted by the laser transceiver at the current handle position will illuminate the color block and be reflected. The reflected light signal received by the laser transceiver at the current handle position will be significantly different from the reflected light signals received by other laser transceivers, thereby determining the current handle position.
6. A digital trombone with a pull rod according to claim 1, characterized in that, The position markings are labeled with solfège names, which are "high 1, 7, 6, 5, 4, 3, 2, 1" in sequence, corresponding to the eight positions of the trombone. The reference pitches corresponding to each position marking are the note names C′, B, A, G, F, E, D, C in sequence, used to indicate the current position number of the trombone and its corresponding reference pitch.
7. A digital trombone with a pull handle according to claim 1, characterized in that, The playing information acquisition module is located in the mouthpiece assembly and has a built-in air pressure sensor. It can sense the air pressure of the player's breath in real time, convert it into an electrical signal, and transmit it to the control module for processing to control the volume and duration of the notes played.
8. A digital trombone with a pull rod according to claim 1, characterized in that, The button module is connected to the control module. The button module includes a power button, volume control buttons, transposition buttons, octave up and octave down buttons, and semitone up buttons. The transposition button is used to trigger a transposition command. The control module defaults to C major as the reference key and, according to the transposition command, shifts the reference pitch corresponding to the current position signal by a preset number of semitones to generate the transposed target pitch. When the octave up and octave down buttons are triggered, the control module shifts the reference pitch corresponding to the current position signal up or down by one octave (12 semitones). When the octave up and octave down buttons are pressed simultaneously, a sustain effect is triggered. When the semitone up button is triggered, the control module shifts the current reference pitch up by one semitone. When any two or more of the above commands are triggered simultaneously, the control module accumulates the offsets corresponding to each command to generate the composite shifted target pitch.
9. A digital trombone with a pull rod according to claim 1, characterized in that, The control module synchronously receives the position signal from the tube position detection module and the air pressure parameters from the playing information acquisition module. Based on the reference pitch corresponding to the current position and the shift generated by the button module, it determines the note number of the target pitch, retrieves the corresponding audio data from the sound source module, adjusts the volume and playback duration in combination with the air pressure parameters, synthesizes the audio signal, and drives the sound output module to output sound.