Electronic guqin playing system simulating trigger synthesis and audio simulation method

Abstract

This invention relates to the field of electroacoustic musical instrument technology, specifically to an electronic guqin playing system and audio simulation method based on simulated trigger synthesis. The system includes: vibrating strings, pressing strings, and an overtone switch; determining the string height and amplitude as trigger parameters based on the vibration signal; converting the pitch parameter based on the damping position signal; and finally synthesizing and outputting simulated audio based on the trigger parameters, pitch parameter, and overtone trigger signal. Addressing the problem that the timbre of existing electronic guqins is still constrained by the characteristics of the strings themselves, this invention decouples the string triggering from the pitch control principle. The vibrating string module is only used to collect the vibration signal when the corresponding string is triggered, the pressing string module is used to collect the pressing position of the corresponding fret on the string, and the overtone part has an independent overtone switch. Finally, the processing module synthesizes the actual simulated audio for playback, achieving a higher degree of freedom in timbre synthesis and avoiding the influence of string vibration characteristics on timbre.

Description

Technical Field

[0001] This invention relates to the field of electroacoustic musical instrument technology, specifically to an electronic guqin playing system and audio simulation method based on simulated trigger synthesis. Background Technology

[0002] The guqin is a traditional musical instrument, also known as the yaoqin or yuqin. It has a hardwood body and seven strings fixed between the yueshan (bridge) and longyin (strings). Playing involves pressing the frets with the left hand and plucking the strings with the right hand to create specific pitches and timbres. Traditionally, the guqin's timbre is determined by the materials of the strings and body. However, in recent years, some designs have utilized modern electroacoustic principles to modify the guqin, aiming to achieve a wider range of tones.

[0003] For example, patent application CN201320422822.X discloses a multimedia interactive electric guqin, belonging to the field of folk musical instrument technology. The strings of the electric guqin are fixed at both ends to the front nut and rear shell of the outer casing, respectively. A pickup is placed at the front of the inner cavity of the electric guqin and connected to an external sound amplification controller. An indicator light is fixed to the bottom plate of the inner cavity. An infrared sensor is placed under the table where the electric guqin is placed, corresponding to the guqin's pitch positions. A display module is placed under the bottom plate between the front and rear sound holes of the electric guqin; its input is connected to the infrared sensor, and its output is connected to the indicator light. When the strings of this electric guqin are plucked, the vibration of the strings cuts the magnetic lines of the pickup below, thereby adjusting the volume and changing the timbre. The infrared sensor captures the position of the player's arm, which is beneficial for guqin teaching and enhances the performance aspect of the guqin, allowing interaction between the player and the instrument.

[0004] For example, patent application CN201520811273.4 discloses an electronic string keyboard for vocal sight-singing practice, relating to the field of vocal sight-singing. The main body of the electronic keyboard is divided into a string adjustment and playing area, a pitch control area, and a music score display area. The string adjustment and playing area includes an electronic string nut structure, an electronic string guqin hill structure, an electronic string guqin string eye structure, and an electronic string guqin string structure. The power knob of the pitch control area is located on the left side of the string adjustment and playing area. The electronic string amplifier speaker structures are located on the left and right sides above the string adjustment and playing area. String sound adjustment knobs, music score selection control buttons, a second pre-selection rhythm button, a string accompaniment switch, and a first pre-selection rhythm button are arranged sequentially from left to right between the two electronic string amplifier speaker structures. The music score display area is a music score display LCD panel structure, located in the middle of the two electronic string amplifier speaker structures, enabling learners to actively learn and significantly improving teaching effectiveness.

[0005] However, in practical implementation, the inventors discovered that the existing electronic guqin is essentially still a combination of strings and electronic pickups. The electronic pickups collect the vibrations of the strings and convert them into analog audio signals with specific timbres for playback. This means that the final timbre is still constrained to some extent by the material of the strings; for example, different string materials have different damping coefficients, and the time from triggering to the dissipation of vibrational energy also varies. During dissipation, the electronic pickups continue to generate signals to create a "reverberation" effect, greatly limiting the performer's choice of specific timbres. Directly replacing the electronic guqin with a MIDI keyboard loaded with specific timbres would alter the playing method, preventing the performer from using traditional guqin playing techniques and contradicting their intuitive playing style. Summary of the Invention

[0006] To address the aforementioned problems in the existing technology, an electronic guqin playing system based on simulated trigger synthesis is provided. On the other hand, an audio simulation method suitable for this electronic guqin system is also provided.

[0007] The specific technical solution is as follows: An electronic guqin playing system based on analog trigger synthesis, comprising: A vibrating string module, which collects the user's plucking motion and converts it into a vibration signal; The string pressing module acquires the user's first pressing position and converts it into a damping position signal; An overtone switch, which acquires the user's second press position and converts it into an overtone trigger signal; The processing module is connected to the vibrating string module, the pressing string module, and the overtone switch, respectively. The processing module determines the triggered string height and amplitude as triggering parameters according to the vibration signal, and the processing module converts the pitch parameter according to the damping position signal. The processing module synthesizes and outputs analog audio based on the trigger parameters, the pitch parameters, and the overtone trigger signal.

[0008] On the other hand, it also includes the body of the instrument, on which a bridge is provided; The bridge is located between the first fret and the nut, spanning multiple strings. The vibrating string module includes seven vibrating strings, which are distributed laterally on the right side of the bridge, with both ends connected to the bridge and the nut respectively, and are suspended at a certain height relative to the instrument body; The pressing string module includes seven pressing strings, which are distributed laterally on the left side of the bridge and attached to the dragon gum position on the soundboard. The harmonic switches are located on the upper surface of the bridge, with their positions corresponding to the heights of each string.

[0009] On the other hand, the vibrating string module also includes a piezoelectric sensor corresponding to each of the vibrating strings; The piezoelectric sensor is disposed inside the bridge or the bridge of the instrument and is connected to the end of the vibrating string; Each of the piezoelectric sensors acquires the amplitude of the vibrating string and generates the vibration signal output.

[0010] On the other hand, the pressing of the string is achieved using a sensor slider; The pressing string module measures the voltage value of each of the sensing sliders through a voltage sampling circuit and assembles them to form the damping position signal.

[0011] On the other hand, the overtone switch is implemented using a touch switch.

[0012] On the other hand, the processing module includes: A vibration discrimination module determines the triggered string height and the signal amplitude corresponding to the amplitude from the input multi-channel vibration signals to establish the triggering parameters; A pitch conversion module that maps the damping position signal to the pitch parameter; An audio simulation module, which is connected to the vibration resolution module and the pitch conversion module respectively; The audio simulation module performs cross-discrimination based on the trigger parameters, the pitch parameters, and the overtone trigger signal, and calculates the initial audio signal of the triggered virtual string. The initial audio signal includes the frequency and amplitude of the virtual string; A timbre loading module, which is connected to the audio simulation module; The audio loading module generates the analog audio based on the initial audio signal and pre-configured timbre parameters.

[0013] On the other hand, the pitch conversion module includes: A sequence assembly module adds the sampled value of the damping position signal to the position timing sequence at the corresponding string height; A pattern recognition module is connected to the sequence assembly module; The pattern recognition module identifies the positional time sequence to determine whether there is a glissando interval and generates a glissando identifier; A pitch assignment module, wherein the pitch assignment module is connected to the pattern recognition module; When the glissando marker indicates that the glissando interval does not exist, the pitch allocation module performs pitch offset compensation on the most recent sampled value and generates the pitch parameter. When the glissando identifier indicates the existence of the glissando interval, the pitch allocation module performs glissando modulation on the glissando interval to generate the pitch parameters.

[0014] An audio simulation method applicable to the aforementioned electronic guqin playing system; The audio simulation method includes: Step S1: Acquire vibration signals, damping position signals, and overtone trigger signals; Step S2: Generate trigger parameters based on the vibration signal, and generate pitch parameters based on the damping position signal; Step S3: Perform cross-discrimination based on the trigger parameters, the overtone trigger signal, and the pitch parameters, and calculate the initial audio signal of the triggered virtual string; Step S4: Generate the analog audio based on the initial audio signal and the pre-configured timbre parameters.

[0015] On the other hand, in step S2, the step of generating the pitch parameter includes: Step S21: Add the sampled value of the damping position signal to the position timing sequence at the corresponding string height; Step S22: Identify the positional time sequence to determine whether a glissando interval exists; If so, perform glissando modulation on the glissando range to generate the pitch parameters; If not, perform pitch compensation on the most recent sampled value and generate the pitch parameter.

[0016] A storage medium includes computer instructions that, when executed by a computer device, perform the above-described audio simulation method.

[0017] The above technical solution has the following advantages or beneficial effects: To address the issue that the timbre of existing electronic guqin is still constrained by the characteristics of the strings themselves, this paper decouples the string triggering from the pitch control principle. The vibrating string module is only used to collect the vibration signal when the corresponding string is triggered, the pressing string module is used to collect the pressing position of the fret on the corresponding string, and the harmonic part is equipped with an independent harmonic switch. Finally, the processing module synthesizes the actual analog audio for playback, achieving a higher degree of freedom in timbre synthesis and avoiding the influence of the string's vibration characteristics on the timbre. Attached Figure Description

[0018] Embodiments of the invention will be described more fully with reference to the accompanying drawings. However, the drawings are for illustration and explanation only and do not constitute a limitation on the scope of the invention.

[0019] Figure 1 This is an overall schematic diagram of an embodiment of the present invention; Figure 2 This is an isometric schematic diagram of an embodiment of the present invention; Figure 3 This is a partial schematic diagram of the bridge in an embodiment of the present invention; Figure 4 This is a cross-sectional schematic diagram in an embodiment of the present invention; Figure 5 This is a schematic diagram of the processing module in an embodiment of the present invention; Figure 6 This is a schematic diagram of the pitch conversion module in an embodiment of the present invention; Figure 7 This is a schematic diagram of the method in an embodiment of the present invention; Figure 8 This is a schematic diagram of step S2 in an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0023] This invention includes: An electronic guqin playing system based on analog trigger synthesis, such as Figure 1 As shown, it includes: Vibrating string module 1: Vibrating string module 1 collects the user's plucking action and converts it into a vibration signal; String pressing module 2: String pressing module 2 acquires the user's first pressing position and converts it into a damping position signal; Overtone switch 3 acquires the user's second press position and converts it into an overtone trigger signal; Processing module 4 is connected to vibrating string module 1, pressing string module 2 and harmonic switch 3 respectively; The processing module 4 determines the string height and amplitude to be triggered as triggering parameters based on the vibration signal, and the processing module converts the pitch parameter based on the damping position signal. Processing module 4 synthesizes and outputs analog audio based on trigger parameters, pitch parameters, and overtone trigger signals.

[0024] Specifically, addressing the issue that the timbre of existing electronic guqin is still constrained by the characteristics of the strings themselves, this paper decouples the string triggering from the pitch control principle. The vibrating string module 1 is only used to collect the vibration signal when the corresponding string is triggered, the pressing string module 2 is used to collect the pressing position of the fret on the corresponding string, and the overtone part is equipped with an independent overtone switch 3. Finally, the processing module 4 synthesizes the actual analog audio for playback, achieving a higher degree of freedom in timbre synthesis and avoiding the influence of the string vibration characteristics on the timbre.

[0025] Specifically, the sound production mechanism of traditional guqin or electronic pickup guqin is usually as follows: The seven strings, arranged in sequence, have a gradient in thickness, resulting in different oscillation frequencies when stimulated by the player's right hand, thus producing different timbres. The player's left hand changes the length of the stimulated string by pressing different positions on it, thereby changing the pitch. To facilitate playing, the left hand's pressing positions usually include frets to indicate the corresponding pressing positions. These frets are typically located on the outside of the first string, arranged from right to left as frets one through thirteen.

[0026] To address the aforementioned sound generation mechanism, this solution decouples the functions of the seven strings of the instrument, dividing them into a vibrating string module 1 and a pressing string module 2. The vibrating string module 1 is solely used to collect the vibration time point, amplitude, and corresponding string height generated by the user's right-hand plucking motion as vibration signals. The pressing string module 2 collects the user's left-hand pressing position, which, depending on the sensor's principle, is converted into voltage signals, current signals, resistance measurement signals, or position reading signals, thereby forming a damping position signal.

[0027] In processing module 4, the vibration signal and damping position signal mentioned above are processed. For example, the amplitude and the corresponding string height are used as trigger parameters for the right hand, and the damping position signal is mapped back to the fret position or pitch corresponding to the first pressing position of the left hand to obtain the pitch parameter.

[0028] Meanwhile, the vibration signal and damping position signal mentioned above are acquired in parallel through multiple channels. The number of channels corresponds to the first to seventh strings of the guqin. The vibration string module 1 and the pressing string module 2, which are paired up, form a virtual string. The vibration string module 1 is responsible for triggering, and the pressing string module 2 is responsible for damping.

[0029] For the trigger parameters and pitch parameters, after aligning and cross-comparing the number of channels, the results of whether each string is triggered, the amplitude of the triggered vibration, and the pitch of the virtual string can be obtained. These results can then be used to synthesize the initial audio signal. This initial audio signal only represents the transient characteristics of the onset of the sound at that moment and the corresponding sound frequency, but it is essentially a "dry tone". The specific timbre is determined by the pre-configured timbre sampling results.

[0030] The processing module 4 then performs a series of mixing operations, loading the sampled timbre onto each initial audio signal to give it a specific “width” in the frequency-time domain, determining the audio gain according to the amplitude of the initial audio signal, mixing when there are multiple initial audio signals, and adding audio effects as needed to simulate the resonance cavity effect of part of the instrument body, so as to finally obtain and output the simulated audio.

[0031] In addition, during actual performance, the performer often needs to make "harmonic" movements. In the guqin, this movement is usually manifested as lightly touching the equal points of the string to suppress the fundamental tone and allow high-frequency harmonics to be emitted. However, the vibrating string module 1 in this solution does not have the function of suppressing sound components. Therefore, an additional harmonic switch 3 is set. Each harmonic switch is set according to the position of the corresponding string and generates an additional harmonic trigger signal when it is triggered.

[0032] Based on this setup, during the actual cross-comparison process, for a single virtual string, it is necessary to cross-discriminate the corresponding vibrating string module 1, pressing string module 2, and overtone switch 3. The pitch parameters generated by pressing string module 2 are used to determine the pitch, while vibrating string module 1 is used to load the amplitude. The overtone trigger signal of overtone switch 3 is used to directly replace the modeling frequency of the overtone in the initial audio signal.

[0033] Then, proceed to the aforementioned steps of timbre loading and mixing.

[0034] In one embodiment, such as Figure 2 As shown, it also includes the body of the instrument B1, on which the bridge B2 is provided; The bridge B2 is located between the first fret B3 and the nut B4, spanning multiple strings. The vibrating string module 1 includes seven vibrating strings B5, which are distributed laterally on the right side of the bridge B2. The two ends are connected to the bridge B2 and the nut B4 respectively and are suspended at a certain height relative to the body B1. The pressing string module 2 includes seven pressing strings B6, which are distributed horizontally on the left side of the bridge B2 and attached to the gum position on the soundboard. The harmonic switch 3 is located on the upper surface of the bridge B2, with its position corresponding to the height of each string.

[0035] Specifically, based on the above concept, this solution makes the above modifications to the body of the traditional guqin to achieve the design of the above-mentioned playing system, while making the playing process conform to the player's intuition.

[0036] Specifically, the structure of the body B1 is consistent with that of a typical guqin, with the right side being the qin head and the left side being the dragon teeth. The upper part of the qin surface is used to set the vibrating string B5, the pressing string B6, and the harmonic switch 3.

[0037] In setting the vibrating string B5 and pressing the string B6, the traditional guqin's fret positions and dragon teeth are used as references.

[0038] The "dragon teeth" are structures located on the left side of the instrument body B1, used to fix one end of each string. They determine the spacing and direction of the strings on the instrument's surface. Seven pressing strings B6 are arranged laterally according to this direction. The length of the pressing strings B6 in the left-right direction of the instrument needs to completely cover the positions from the first fret B3 to the thirteenth fret, thus meeting the requirement of complete left-side damping. The pressing strings B6 can detect the user's first pressing position and convert it into a structural voltage change, thereby forming a damping position signal.

[0039] like Figure 3 As shown, since the pressing string B6 is fixedly attached to the soundboard, it does not have the normal height for a guqin. To allow the vibrating string B5 to be plucked at a normal playing height, this design introduces the structure of the bridge B2. The bridge B2 is a transverse structure perpendicular to the long axis of the instrument body B1, with a certain height, roughly matching the nut B4. The function of the bridge B2 is to fix one end of the vibrating string B5 on its right side, while the other end of the vibrating string B5 is fixed to the nut B4, thus giving the vibrating string B5 a normal height for support.

[0040] The seven vibrating strings B5 are arranged along the extension of the pressing string B6 in the projection direction, so that the plucking position and the damping position have the same depth. The vibrating strings B5 are made of elastic materials, such as silicone or other polymer materials, and are only used to collect the vibrations caused by the user's plucking action. One end of each string is equipped with a sensor similar to a piezoelectric ceramic sensor or other equivalent sensor to sense the vibration and amplitude on the string.

[0041] Regarding the harmonic switch 3, since the player's habit is usually to enter the string with the right hand and only lightly touch the string with the left hand, the position that is more in line with the player's intuition is between the first fret and the bridge. Therefore, it is set on the top of the bridge B2. The positions of the seven harmonic switches 3 also correspond to the extension line of the pressed string B6. They are implemented in a way similar to capacitor switches, generating harmonic trigger signals by lightly touching the switches, which is relatively in line with the player's intuition.

[0042] Accordingly, after completing the above modifications, the original resonance chamber at the bottom of the instrument was removed and replaced with a cable, processing module 4, and amplifier module. Processing module 4 connects to various sensors via cables to acquire corresponding electrical signals and generates audio according to a pre-set software algorithm. The amplifier module then plays the audio, completing the audio simulation and playback process. The remaining components, such as the power supply module for each module and external amplifier audio plugs, wireless modules, and indicator lights, can be combined arbitrarily with reference to existing technologies, which are easily implemented by those skilled in the art and therefore will not be elaborated further.

[0043] In one embodiment, such as Figure 4 As shown, the vibrating string module 1 also includes a piezoelectric sensor B7 corresponding to each vibrating string; The piezoelectric sensor B7 is located inside the bridge B4 or the piano bridge B2 and is connected to the end of the vibrating string. Each piezoelectric sensor B7 acquires the amplitude of the vibrating string B5 and outputs a vibration signal.

[0044] Specifically, to achieve better data acquisition, this embodiment uses a piezoelectric sensor B7 to acquire the vibration of the vibrating string B5. The figure shows a cross-sectional view of this structure. The end of the vibrating string B5 is fixed on the bridge B2 side, while the other end is connected to the sensing end of the piezoelectric sensor B7 embedded in the bridge B4. The piezoelectric sensor B7 is powered by a cable connected to the processing module and transmits the acquired amplitude. The processing module 4 determines which vibrating string B5 is triggered by maintaining the correspondence between the input pin numbers and the virtual strings. Each string has an independently configured piezoelectric ceramic sensor that captures the mechanical deformation waveform generated when the string is plucked. It does not produce actual musical sound; it only serves as an energy trigger source, acquiring the transient characteristics of the attack.

[0045] In actual implementation, the above-mentioned piezoelectric sensor B7 is only one embodiment. It can be replaced with other sensors as needed, such as force sensors that measure vibration force and convert it into amplitude based on the Hall effect, grating sensors based on the photoelectric effect, etc. All of the above sensors can convert the amplitude into an electrical signal and feed it into the processing module 4 for further processing.

[0046] In one embodiment, pressing string B6 is achieved using a sensor slider; The pressing string module 2 measures the voltage value of each sensing slider through a voltage sampling circuit and assembles them to form a damping position signal.

[0047] Specifically, to achieve better measurement results, this embodiment uses a sensor slider to press string B6. The sensor slider is installed on the instrument surface in a specific direction, and pressing different positions changes the voltage value across the measuring circuit. Subsequently, the processing module 4 uses the voltage values ​​measured on each input channel to look up a table and deduce the user's actual pressing position and the corresponding pitch.

[0048] In other embodiments, the pressing string can also be replaced by equivalent technical means, such as using a long soft silicone micro switch to trigger it, and changing the resistance length of the connected circuit by pressing different positions. At this time, the damping position signal becomes a resistance sampling signal obtained by sampling and measuring the connected resistance, which can also be used to reflect the user's pressing position.

[0049] In another embodiment, the pressing string can also be replaced by a flexible touch screen or similar technology. In this case, the damping position signal corresponds to the position signal directly output by the touch screen, and the processing module 4 can directly determine the user's pressing position based on the corresponding position signal.

[0050] In one embodiment, such as Figure 5 As shown, processing module 4 includes: Vibration discrimination module 41 determines the triggered string height and amplitude from the input multi-channel vibration signal to establish triggering parameters; Pitch conversion module 42 maps the damping position signal into pitch parameters; Audio simulation module 43 is connected to vibration resolution module 41 and pitch conversion module 42 respectively; The audio simulation module 43 performs cross-discrimination based on the trigger parameters, pitch parameters, and overtone trigger signals, and calculates the initial audio signal of the triggered virtual string; The initial audio signal includes the frequency and amplitude of the virtual string; The timbre loading module 44 is connected to the audio analog module 43. The audio loading module 44 generates analog audio based on the initial audio signal and pre-configured timbre parameters.

[0051] Specifically, to achieve better processing results, this embodiment first processes the vibrating string and the pressed string separately. The input signals of the two channels are processed and merged synchronously in time.

[0052] For the vibration signal generated by the vibrating string, its input channel, i.e., the string height of the corresponding virtual string, can be obtained. Then, the peak value of the amplitude is read, thereby converting it into trigger parameters. The trigger parameters are a multi-dimensional sequence, where each element corresponds to the amplitude of each trigger string at the current moment, which determines the subsequent gain coefficient.

[0053] For the damping position signal generated by pressing the string, the corresponding pitch frequency is deduced by looking up a table, and then the pitch parameters are constructed. The pitch parameters are a multi-dimensional sequence, where each element corresponds to the frequency of each pressed string at the current moment.

[0054] After obtaining the above sequence, cross-discrimination is performed based on the trigger parameters, pitch parameters, and overtone trigger signals. This includes extracting the corresponding elements from the trigger parameters and pitch parameters for each virtual string and matching them with the number of channels of the overtone trigger signals to form a triplet for discrimination.

[0055] During the discrimination process, the overtone trigger signal has the highest priority and is used to switch between real tone and overtone. When an overtone is present, the system directly outputs the standard overtone sampling or modeling frequency as the initial audio signal.

[0056] In some embodiments, in overtone mode, the system can also synchronously capture the minute displacement of the user's pressing position in the pitch parameter through frequency oscillation. The system captures this change and applies it to the LFO (low-frequency oscillator) or cutoff frequency of the audio system, thereby superimposing dynamic frequency oscillations or timbre changes on the output overtone samples to simulate a realistic vibrato effect.

[0057] When the overtone trigger signal is empty, it indicates that it is a real sound. The system generates an initial audio signal with a corresponding gain coefficient by reading the corresponding amplitude and frequency in the trigger parameters.

[0058] After obtaining the initial audio signal, the timbre loading process is performed, including loading the timbre onto each initial audio signal, determining the audio gain according to the amplitude of the initial audio signal, mixing when there are multiple initial audio signals, and adding audio effects as needed to simulate the resonance chamber effect of part of the instrument body, so as to finally obtain the simulated audio and output it.

[0059] The analog audio output can be an amplifier module installed in the instrument body, or a speaker similar to those in other electro-acoustic instruments that outputs to the outside via a coaxial cable.

[0060] In one embodiment, such as Figure 6 As shown, the pitch conversion module 42 includes: Sequence assembly module 421 adds the sampled value of the damper position signal to the position timing sequence at the corresponding string height; Pattern recognition module 422, which is connected to sequence assembly module 421; Pattern recognition module 422 identifies the positional time sequence to determine whether there is a glissando interval and generates a glissando identifier; Pitch assignment module 423, pitch assignment module 423 is connected to pattern recognition module 422; When the glissando marker indicates that there is no glissando interval, the pitch allocation module 423 performs pitch offset compensation on the most recent sampled value and generates pitch parameters; When the glissando marker indicates the existence of a glissando interval, the pitch allocation module 423 performs glissando modulation on the glissando interval to generate pitch parameters.

[0061] Specifically, in actual performance, ideally, the performer will press the strings according to the markings on the frets to modulate the pitch of a specific interval. However, in reality, the performer's pressing position may be off. In addition, some playing techniques require "free glissando" on the strings, that is, continuously sliding the pressing position on the strings to create a specific timbre.

[0062] Based on the above requirements, a windowing method was used to determine the actual performance intention during the generation of pitch parameters. Specifically, after acquiring the damping position signal, the currently received sample value was first loaded into the position timing sequence of the corresponding string height according to its input channel.

[0063] For the location time sequence, it is reverse sampled to identify whether multiple voltage sample values ​​appearing in the window show continuous changes and whether the difference between the two ends of the window is greater than the threshold, and then a label is assigned after the discrimination.

[0064] If this mode appears, it indicates that the performer is pressing down on the string and making a large-area slide. When generating pitch parameters, the pitch bend wheel is combined to generate the corresponding pitch frequency change, so that the output results at each point in time are smooth and consistent with the actual infinite pitch transition effect.

[0065] If this mode is not present, the corresponding pitch parameters can be generated directly. Offset compensation can also be configured as needed; that is, within a certain sampling range relative to the standard fret, the standard frequency corresponding to the fret is directly output for compensation. Chromatic compensation can also be added as needed to achieve a more convenient playing effect.

[0066] An audio simulation method applicable to the aforementioned electronic guqin playing system; like Figure 7 As shown, the audio simulation method includes: Step S1: Acquire vibration signals, damping position signals, and overtone trigger signals; Step S2: Generate trigger parameters based on the vibration signal, and generate pitch parameters based on the damping position signal; Step S3: Based on the trigger parameters, overtone trigger signal and pitch parameters, perform cross-discrimination and calculate the initial audio signal of the triggered virtual string; Step S4: Generate analog audio based on the initial audio signal and pre-configured timbre parameters.

[0067] Specifically, to achieve better processing results, this embodiment first processes the vibrating string and the pressed string separately. The input signals of the two channels are processed and merged synchronously in time.

[0068] For the vibration signal generated by the vibrating string, its input channel, i.e., the string height of the corresponding virtual string, can be obtained. Then, the peak value of the amplitude is read, thereby converting it into trigger parameters. The trigger parameters are a multi-dimensional sequence, where each element corresponds to the amplitude of each trigger string at the current moment, which determines the subsequent gain coefficient.

[0069] For the damping position signal generated by pressing the string, the corresponding pitch frequency is deduced by looking up a table, and then the pitch parameters are constructed. The pitch parameters are a multi-dimensional sequence, where each element corresponds to the frequency of each pressed string at the current moment.

[0070] After obtaining the above sequence, cross-discrimination is performed based on the trigger parameters, pitch parameters, and overtone trigger signals. This includes extracting the corresponding elements from the trigger parameters and pitch parameters for each virtual string and matching them with the number of channels of the overtone trigger signals to form a triplet for discrimination.

[0071] During the discrimination process, the overtone trigger signal has the highest priority and is used to switch between real tone and overtone. When an overtone is present, the system directly outputs the standard overtone sampling or modeling frequency as the initial audio signal.

[0072] When the overtone trigger signal is empty, it indicates that it is a real sound. The system generates an initial audio signal with a corresponding gain coefficient by reading the corresponding amplitude and frequency in the trigger parameters.

[0073] After obtaining the initial audio signal, the timbre loading process is performed, including loading the timbre onto each initial audio signal, determining the audio gain according to the amplitude of the initial audio signal, mixing when there are multiple initial audio signals, and adding audio effects as needed to simulate the resonance chamber effect of part of the instrument body, so as to finally obtain the simulated audio and output it.

[0074] The analog audio output can be an amplifier module installed in the instrument body, or a speaker similar to those in other electro-acoustic instruments that outputs to the outside via a coaxial cable.

[0075] In one embodiment, such as Figure 8 As shown, step S2, the step of generating pitch parameters, includes: Step S21: Add the sampled value of the damping position signal to the position timing sequence at the corresponding string height; Step S22: Identify the positional time sequence to determine whether a glissando interval exists; If so, perform glissando modulation on the glissando range to generate pitch parameters; If not, perform pitch compensation on the most recent sampled value and generate pitch parameters.

[0076] Specifically, in actual performance, ideally, the performer will press the strings according to the markings on the frets to modulate the pitch of a specific interval. However, in reality, the performer's pressing position may be off. In addition, some playing techniques require "free glissando" on the strings, that is, continuously sliding the pressing position on the strings to create a specific timbre.

[0077] Based on the above requirements, a windowing method was used to determine the actual performance intention during the generation of pitch parameters. Specifically, after acquiring the damping position signal, the currently received sample value was first loaded into the position timing sequence of the corresponding string height according to its input channel.

[0078] For the location time sequence, it is reverse sampled to identify whether multiple voltage sample values ​​appearing in the window show continuous changes and whether the difference between the two ends of the window is greater than the threshold, and then a label is assigned after the discrimination.

[0079] If this mode appears, it indicates that the performer is pressing down on the string and making a large-area slide. When generating pitch parameters, the pitch bend wheel is combined to generate the corresponding pitch frequency change, so that the output results at each point in time are smooth and consistent with the actual infinite pitch transition effect.

[0080] If this mode is not present, the corresponding pitch parameters can be generated directly. Offset compensation can also be configured as needed; that is, within a certain sampling range relative to the standard fret, the standard frequency corresponding to the fret is directly output for compensation. Chromatic compensation can also be added as needed to achieve a more convenient playing effect.

[0081] A storage medium includes computer instructions that, when executed by a computer device, perform the aforementioned audio simulation method.

[0082] Those skilled in the art will understand that various aspects, or possible implementations of various aspects, of the present invention can be embodied as systems, methods, or computer program products. Therefore, various aspects, or possible implementations of various aspects, of the present invention can take the form of entirely hardware embodiments, entirely software embodiments (including firmware, resident software, etc.), or embodiments combining software and hardware aspects, all collectively referred to herein as "circuit," "module," or "system." Furthermore, various aspects, or possible implementations of various aspects, of the present invention can take the form of computer program products, which are computer instructions stored in memory.

[0083] The memory can be a computer-readable signal medium or a computer-readable storage medium. Computer-readable storage media include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or apparatuses, or any suitable combination thereof, such as random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, and portable read-only memory (CD-ROM).

[0084] A processor in a computer reads computer instructions stored in memory, enabling the processor to execute the functional actions specified in each step or combination of steps in a flowchart; and to generate means for implementing the functional actions specified in each block or combination of blocks in a flowchart.

[0085] It should be understood that a processor in a computer can be understood as one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers (MCUs), microprocessors, or other electronic components used to execute the aforementioned computer instructions.

[0086] Computer instructions may be executed entirely on the user's local computer, partially on the user's local computer, as a separate software package, partially on the user's local computer and partially on a remote computer, or entirely on a remote computer or server. It should also be noted that in some alternative implementations, the functions indicated by the steps in the flowchart or the blocks in the block diagram may not occur in the order shown in the diagram. For example, depending on the functions involved, two consecutive steps or blocks may actually be executed approximately simultaneously, or these blocks may sometimes be executed in reverse order.

[0087] Of course, in practical applications, the various components of a computer system are coupled together through a bus system. The bus system is used to enable communication and connection between these components. In addition to the data bus, the bus system also includes a power bus, a control bus, and a status signal bus.

[0088] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. An electronic guqin playing system based on simulated trigger synthesis, characterized in that, include: A vibrating string module, which collects the user's plucking motion and converts it into a vibration signal; The string pressing module acquires the user's first pressing position and converts it into a damping position signal; An overtone switch, which acquires the user's second press position and converts it into an overtone trigger signal; The processing module is connected to the vibrating string module, the pressing string module, and the overtone switch, respectively. The processing module determines the triggered string height and amplitude as triggering parameters according to the vibration signal, and the processing module converts the pitch parameter according to the damping position signal. The processing module synthesizes and outputs analog audio based on the trigger parameters, the pitch parameters, and the overtone trigger signal.

2. The electronic guqin playing system according to claim 1, characterized in that, It also includes the body of the instrument, on which a bridge is provided; The bridge is located between the first fret and the nut, spanning multiple strings. The vibrating string module includes seven vibrating strings, which are distributed laterally on the right side of the bridge, with both ends connected to the bridge and the nut respectively, and are suspended at a certain height relative to the instrument body; The pressing string module includes seven pressing strings, which are distributed laterally on the left side of the bridge and attached to the dragon gum position on the soundboard. The harmonic switches are located on the upper surface of the bridge, with their positions corresponding to the heights of each string.

3. The electronic guqin playing system according to claim 2, characterized in that, The vibrating string module also includes a piezoelectric sensor corresponding to each of the vibrating strings; The piezoelectric sensor is disposed inside the bridge or the bridge of the instrument and is connected to the end of the vibrating string; Each of the piezoelectric sensors acquires the amplitude of the vibrating string and generates the vibration signal output.

4. The electronic guqin playing system according to claim 1, characterized in that, The pressing of the string is achieved using a sensor slider; The pressing string module measures the voltage value of each of the sensing sliders through a voltage sampling circuit and assembles them to form the damping position signal.

5. The electronic guqin playing system according to claim 1, characterized in that, The overtone switch is implemented using a touch switch.

6. The electronic guqin playing system according to claim 1, characterized in that, The processing module includes: A vibration discrimination module determines the triggered string height and amplitude from the input multi-channel vibration signals to establish the triggering parameters; A pitch conversion module that maps the damping position signal to the pitch parameter; An audio simulation module, which is connected to the vibration resolution module and the pitch conversion module respectively; The audio simulation module performs cross-discrimination based on the trigger parameters, the pitch parameters, and the overtone trigger signal, and calculates the initial audio signal of the triggered virtual string. The initial audio signal includes the frequency and amplitude of the virtual string; A timbre loading module, which is connected to the audio simulation module; The audio loading module generates the analog audio based on the initial audio signal and pre-configured timbre parameters.

7. The electronic guqin playing system according to claim 6, characterized in that, The pitch conversion module includes: A sequence assembly module adds the sampled value of the damping position signal to the position timing sequence at the corresponding string height; A pattern recognition module is connected to the sequence assembly module; The pattern recognition module identifies the positional time sequence to determine whether there is a glissando interval and generates a glissando identifier; A pitch assignment module, wherein the pitch assignment module is connected to the pattern recognition module; When the glissando marker indicates that the glissando interval does not exist, the pitch allocation module performs pitch offset compensation on the most recent sampled value and generates the pitch parameter. When the glissando identifier indicates the existence of the glissando interval, the pitch allocation module performs glissando modulation on the glissando interval to generate the pitch parameters.

8. An audio simulation method, characterized in that, Applicable to the electronic guqin playing system as described in any one of claims 1-7; The audio simulation method includes: Step S1: Acquire vibration signal, damping position signal, and overtone trigger signal; Step S2: Generate trigger parameters based on the vibration signal, and generate pitch parameters based on the damping position signal; Step S3: Perform cross-discrimination based on the trigger parameters, the overtone trigger signal, and the pitch parameters, and calculate the initial audio signal of the triggered virtual string; Step S4: Generate the analog audio based on the initial audio signal and the pre-configured timbre parameters.

9. The audio simulation method according to claim 8, characterized in that, In step S2, the step of generating the pitch parameter includes: Step S21: Add the sampled value of the damping position signal to the position timing sequence at the corresponding string height; Step S22: Identify the positional time sequence to determine whether a glissando interval exists; If so, perform glissando modulation on the glissando range to generate the pitch parameters; If not, perform pitch compensation on the most recent sampled value and generate the pitch parameter.

10. A storage medium comprising computer instructions, characterized in that, When the computer device executes the computer instructions, it performs the audio simulation method as described in any one of claims 8-9.

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