A keyboard electroacoustic musical instrument played directly on a staff

Abstract

The present application relates to a kind of keyboard electroacoustic musical instruments directly playing on staff, the keyboard electroacoustic musical instruments includes processor, sound source circuit, staff keyboard, the staff keyboard includes staff pitch diagram area and the note key of arrangement in staff pitch diagram area, wherein, the included angle between the geometric center point connection line of note key and the parallel horizontal line of staff is non-zero angle.The keyboard electroacoustic musical instruments directly playing on staff of the present application makes the more close combination of staff pitch diagram area and key, improves the learning effect of staff music theory knowledge.

Description

Technical Field

[0001] This invention belongs to the field of keyboard electro-acoustic musical instrument technology, specifically relating to a keyboard electro-acoustic musical instrument that can be played directly on a staff. Background Technology

[0002] The staff is a musical notation system that uses five equally spaced parallel horizontal lines to mark notes of different durations and other symbols to record music. It primarily serves keyboard instruments. To learn music theory related to the staff, Figure 1 The keyboard electro-acoustic instrument shown in the demonstration is widely used, and includes a keyboard 1, a staff pitch indication area 2, and a staff writing area 3. To learn musical notation more intuitively, the staff pitch indication area needs to be more closely integrated with the note keys. Taking an 88-key keyboard as an example, setting up so many keys on the staff is not easy and doesn't significantly help improve learning of musical theory. Furthermore, existing pitch and mode adjustment circuits are not suitable for keyboard electro-acoustic instruments played directly on the staff. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a keyboard electro-acoustic instrument that can be played directly on a staff. The keyboard electro-acoustic instrument includes a processor and a sound source circuit. Furthermore, the keyboard electro-acoustic instrument also includes:

[0004] The staff keyboard includes a staff pitch indication area and note keys arranged in the staff pitch indication area, wherein the angle between the line connecting the geometric center points of the note keys and the parallel horizontal line of the staff is a non-zero angle.

[0005] The pitch adjustment switch includes:

[0006] The switch body is used to fix the first contact and several second contacts;

[0007] A toggle element includes an electrically connected first end and a second end of a oscillating element, wherein the first end of the oscillating element is electrically connected to a first contact, and the second end of the oscillating element is electrically connected to a first contact and at least one second contact; preferably, the second end of the oscillating element is electrically connected to one, two, or three second contacts.

[0008] The first contact point has one end electrically connected to the note key and the other end electrically connected to the wave element.

[0009] The second contact has one end adjustablely connected to the corresponding second matrix wire or its adjacent second matrix wire, and the other end electrically connected to the wave element.

[0010] Further keyboard electronic instruments played directly on the staff, including:

[0011] The first contact, at the end electrically connected to the wave element, has the same number of constant contact positions as the second contact.

[0012] Further keyboard electronic instruments played directly on the staff, including:

[0013] The second contact is disposed on one or both sides of the first contact; preferably, the second contact is disposed on both sides of the first contact; more preferably, the first end and the second end of the oscillating element are electrically connected to the first contact and can be toggled respectively.

[0014] Further, keyboard electronic instruments played directly on the staff.

[0015] The first contact, at one end of which is electrically connected to the wave element, has a constant contact position.

[0016] Further keyboard electronic instruments played directly on the staff, including:

[0017] The second contact is disposed around the first contact; preferably, the second contact is disposed on the outer circumference of the first contact, one end of the oscillating element is rotatably electrically connected to the first contact, and the other end of the oscillating element is electrically connected to any one or more second contacts.

[0018] Further keyboard electronic instruments played directly on the staff, including:

[0019] The keyboard electro-acoustic instrument also includes a pitch adjustment circuit, which comprises two sets of intersecting matrix node lines and several note keys corresponding to the pitch intersections of the two sets of matrix node lines. The first set of matrix node lines includes several first matrix node lines, and the second set of matrix node lines includes several second matrix node lines. The pitch adjustment circuit also includes several pitch adjustment switches, the same number as the number of note keys, wherein:

[0020] The first contact of any pitch adjustment switch is electrically connected to the corresponding first matrix node via the corresponding note button;

[0021] The second contact of any pitch-adjusting switch is electrically connected to the corresponding second matrix wire or its adjacent second matrix wire;

[0022] The pitch intersections include basic pitch intersections obtained by the intersection of the corresponding first matrix node lines and the corresponding second matrix wire lines, and several basic pitch intersections form a basic pitch matrix; adjusting the pitch mode adjustment switch so that the pitch intersections form a basic pitch matrix results in a basic pitch mode;

[0023] The pitch crossover points also include lowered semitone crossover points or raised semitone crossover points obtained by the intersection of the corresponding first matrix node line and the adjacent second matrix wire line. Several lowered semitone crossover points form a lowered semitone matrix, and several raised semitone crossover points form a raised semitone matrix. Adjusting the pitch mode adjustment switch so that the pitch crossover points form a raised semitone matrix or a lowered semitone matrix results in a raised semitone mode or a lowered semitone mode.

[0024] Further keyboard electronic instruments played directly on the staff, including:

[0025] The pitch crossover points include basic pitch crossover points obtained by the intersection of the corresponding first matrix node line and the corresponding second matrix wire line. Several basic pitch crossover points form a basic pitch matrix. When the pitch mode adjustment switch is adjusted so that all pitch crossover points form basic pitch crossover points, the basic pitch mode corresponds to the basic pitch matrix.

[0026] The pitch cross points also include a semitone lowered cross point obtained by the intersection of the corresponding first matrix node line and the adjacent second matrix wire. Several semitone lowered cross points form a semitone lowered matrix. When the pitch mode adjustment switch is adjusted so that all pitch cross points form a semitone lowered cross point, these semitone lowered cross points form a semitone lowered matrix, which corresponds to a semitone lowered mode.

[0027] The pitch crossover points also include raised semitone crossover points obtained by the intersection of the corresponding first matrix node line and the adjacent second matrix wire. Several raised semitone crossover points form a raised semitone matrix. When the pitch mode adjustment switch is adjusted so that the pitch crossover points form raised semitone crossover points, these raised semitone crossover points form a raised semitone matrix, which corresponds to a raised semitone mode.

[0028] Further keyboard electronic instruments played directly on the staff, including:

[0029] The pitch adjustment switch array contains 16 pitch adjustment switches. The first matrix node lines C0, C1, C2, and C3 form matrix C. The second matrix node lines A0, A1, A2, A3, B0, B1, B2, and B3 form matrix 1, which represents a lowered semitone; matrix 2, which represents the fundamental tone; and matrix 3, which represents a raised semitone. Matrix C, matrix 1, and matrix 2 together form the switch array.

[0030] Further, keyboard electronic instruments played directly on the staff, among which,

[0031] When the pitch and mode adjustment switch is adjusted so that the high crosspoint forms part of the fundamental tone crosspoint, and / or part of the lowered semitone crosspoint, and / or the raised semitone crosspoint, these fundamental tone crosspoints, and / or part of the lowered semitone crosspoint, and / or the raised semitone crosspoint constitute a partial tuning matrix, which corresponds to a partial tuning mode.

[0032] Further, keyboard electronic instruments played directly on the staff, among which,

[0033] The pitch adjustment circuit also includes a function selection matrix node line D0, which, in combination with the second matrix node lines A0, A1, A2, A3, B0, B1, B2, and B3, allows for the selection of beat, tempo, and volume.

[0034] The beneficial effects of this invention are as follows: it provides a keyboard electro-acoustic instrument that can be played directly on the staff, a pitch and mode adjustment circuit, and a pitch and mode adjustment switch, which makes the pitch indication area of ​​the staff more closely integrated with the keys, thereby improving the learning effect of music theory knowledge. Attached Figure Description

[0035] Figure 1 A schematic diagram of an existing demonstration keyboard electro-acoustic instrument;

[0036] Figure 2 A schematic diagram of the circuit principle of an existing demonstration keyboard electro-acoustic musical instrument;

[0037] Figure 3 The present invention relates to a keyboard electro-acoustic instrument that can be played directly on a staff.

[0038] Figure 4 Diagram of a pitch-adjusting toggle switch;

[0039] Figure 5 The present invention relates to a keyboard electro-acoustic instrument that can be played directly on a staff.

[0040] Figure 6 The present invention relates to a keyboard electro-acoustic instrument that can be played directly on a staff.

[0041] Figure 7 The present invention relates to a keyboard electro-acoustic instrument that can be played directly on a staff.

[0042] Figure 8 Schematic diagram of the pitch adjustment circuit for the keyboard electro-acoustic musical instrument of the present invention;

[0043] Figure 9 Including a schematic diagram of the pitch adjustment circuit for the function selection matrix node lines;

[0044] Figure 10 Circuit diagram of a sight-singing and ear-training board. Detailed Implementation

[0045] The following embodiments further illustrate the content of the present invention, but should not be construed as limiting the present invention. Any modifications or substitutions made to the methods, steps, or conditions of the present invention without departing from the spirit and essence of the invention are within the scope of the present invention.

[0046] This invention does not specifically limit the types of keyboard electro-acoustic instruments, such as electronic keyboards, electric pianos, electric guitars, children's pianos, and ear training boards. Furthermore, embodiments of various keyboard electro-acoustic instruments can be combined with each other, and the combined electro-acoustic instruments are still within the scope of protection of this invention. See also... Figure 2 As shown, keyboard electro-acoustic instruments typically include a processor, a keyboard matrix circuit, and a sound source circuit.

[0047] like Figure 3 As shown, this is a keyboard electro-acoustic instrument that can be played directly on a staff in some embodiments of the present invention. The keyboard electro-acoustic instrument further includes:

[0048] The staff keyboard includes a pitch indicator area 4 and note keys 5 arranged within the pitch indicator area. The angle α between the line connecting the geometric center points of each key 5 and the parallel horizontal line of the staff is non-zero. This non-zero angle ensures that the keys 5 can be arranged in a regular pitch pattern within the pitch indicator area 4. For example, if there are 16 keys 5, they can be arranged diagonally within the pitch indicator area 4, which helps in understanding the correspondence between pitch and the staff.

[0049] The pitch adjustment switch includes:

[0050] The switch body is used to fix the first contact and several second contacts;

[0051] A toggle element includes a first end and a second end of an electrically connected oscillating element. The first end of the oscillating element is electrically connected to a first contact, and the second end of the oscillating element is electrically connected to both a first contact and at least one second contact. In a specific embodiment, the second end of the oscillating element is electrically connected to one (see reference). Figure 4 ), 2 (for reference) Figure 5 (B, C) or 3 second contacts (refer to) Figure 6 C);

[0052] The first contact point has one end electrically connected to the note key and the other end electrically connected to the wave element.

[0053] The second contact has one end adjustablely connected to the corresponding second matrix wire or its adjacent second matrix wire, and the other end electrically connected to the wave element.

[0054] In some specific examples of keyboard electro-acoustic instruments played directly on the staff:

[0055] The first contact, at the end electrically connected to the wave element, has the same number of constant contact positions as the second contacts. See also Figure 4 As shown, the three positions of the main slider correspond to three constant contact points (blocks). The blocks are for illustrative purposes only, and their actual shapes can be set according to processing requirements.

[0056] In some specific keyboard electro-acoustic instruments played directly on the staff, in the following examples:

[0057] The second contact is disposed on one or both sides of the first contact; in a more specific embodiment, the second contact is disposed on both sides of the first contact; in a more specific embodiment, the first end and the second end of the oscillating element are electrically connected to the first contact and can be toggled respectively.

[0058] refer to Figure 5 As shown, the second contact 9 is located on one side of the first contact 10, and the second end of the oscillating element 11 is electrically connected to one second contact (positions A and D) or two second contacts (positions B and C). (Reference) Figure 6 As shown, the second contact 9 is located on one side of the first contact 10, and the second end of the oscillating element 11 is electrically connected to one second contact (positions A and E), two second contacts (positions B and D), or three second contacts (position C).

[0059] In other specific examples of keyboard electro-acoustic instruments played directly on the staff:

[0060] The first contact, at one end of which is electrically connected to the wave element, has a constant contact position.

[0061] In other specific examples of keyboard electro-acoustic instruments played directly on the staff:

[0062] The second contact is disposed around the first contact; in a more specific embodiment, the second contact is disposed on the outer circumference of the first contact, one end of the oscillating element is rotatably electrically connected to the first contact, and the other end of the oscillating element is electrically connected to any one or more second contacts.

[0063] like Figure 7As shown, the second contact 9 is located on the outer circumference of the first contact 10. The second end of the oscillating element 11 is electrically connected to one second contact (positions B and F), two second contacts (positions C and E), or three second contacts (position D). When it is in position A, the note key can be stopped, that is, pressing the note key will not produce sound.

[0064] like Figure 8 The diagram shows the schematic of a pitch adjustment circuit for a keyboard electroacoustic instrument according to some embodiments. The pitch adjustment circuit generates a pitch adjustment signal. The MCU sends the pitch-adjusted signal to the sound source circuit, which outputs a corresponding audio signal. Optionally, a potentiometer circuit processes the audio signal through volume control and outputs the initial key tone. A power amplifier circuit amplifies the initial key tone and outputs it through a speaker (not shown in the diagram). Additionally, the MCU outputs relevant information to the display circuit. Taking a pitch adjustment circuit including three pitch adjustment signals—a lowered semitone, the fundamental tone, and a raised semitone—as an example, a pitch toggle switch can be used to select between these three signals. When the generated pitch adjustment signal is 5 (fa) lowered semitone, the MCU will send the pitch-adjusted signal... b 5. The signal is sent to the sound source circuit; when the pitch adjustment circuit generates a pitch adjustment signal of 5 (fa) semitone, the MCU will adjust the pitch signal accordingly. # 5 is sent to the sound source circuit; when the pitch adjustment circuit generates the basic tone 5 (fa) as the pitch adjustment signal, the MCU will send the pitch signal 5 to the sound source circuit.

[0065] The following uses a children's piano as an example to illustrate how the electroacoustic instrument of this invention adjusts the key based on pitch. The settings in the example are not intended to limit the scope of protection of this invention. The children's piano includes a keyboard with 16 keys that can produce 29 notes. Each key can be independently adjusted by using a pitch-adjusting switch. The 16 keys are arranged on the staff on the piano's soundboard according to the 12-tone equal temperament, from low V to high S. Corresponding to the 16 keys, the soundboard has 16 toggle switches. Each toggle switch has three positions; the middle position is the fundamental note of that key. Moving the switch to the left produces a lowered note (half a semitone), and moving it to the right produces a raised note (half a semitone). When all 16 toggle switches are in the middle position, the piano is in the key of C. By adjusting the positions of the toggle switches, the pitch (sharp or flat) of each of the 16 keys can be changed, creating different scale relationships and transforming the piano into various desired keys. Because the pitch of the keys can be partially adjusted, it is easy to set different modes at different positions on the keyboard.

[0066] The following description continues the explanation of the pitch-based tuning circuit for the keyboard electro-acoustic instrument of the present invention. The relevant settings in the examples are not intended to specifically limit the scope of protection of the present invention.

[0067] The working principle of the keyboard electro-acoustic instrument in this embodiment of the invention is as follows: the pitch is selected through a matrix circuit, and the matrix combination is changed by adjusting the position of the toggle switch to form different scale relationships, thereby achieving the purpose of changing the mode.

[0068] In some embodiments, the keyboard electro-acoustic instrument includes a processor, a pitch adjustment circuit, and a sound source circuit, referenced. Figure 9 As shown, the pitch adjustment circuit includes two sets of matrix node lines arranged in a cross pattern. The first set of matrix node lines includes several first matrix node lines, and the second set of matrix node lines includes several second matrix node lines. The first set of matrix node lines consists of four first matrix node lines (C0, C1, C2, C3), and the second set of matrix node lines consists of eight second matrix node lines (A0, A1, A2, A3, B0, B1, B2, B3). The pitch adjustment circuit also includes several note keys 1 corresponding to the pitch intersections of the two sets of matrix node lines. The term "corresponding" refers to note keys associated with the same note. It should be noted that the number of note keys 1 can be equal to the number of pitch intersections; in a more specific embodiment, the number of note keys 1 is less than the number of pitch intersections. Figure 9 The note key symbols do not represent the physical number of note keys 1, but rather the logical number of note keys 1. For details, refer to the pitch adjustment switches mentioned later. One pitch adjustment switch corresponds to a physical number of note keys 1, while the corresponding logical number is 3.

[0069] Continue to refer to Figure 9 As shown, the two sets of intersecting matrix node lines form several intersection points. These intersection points are not electrical connection points but are used to more accurately illustrate the circuit topology of the two sets of intersecting matrix node lines. The electrical connection between the first and second intersecting matrix node lines requires the use of note key 1. The intersection points include pitch intersection point 2 and ordinary intersection point 3. Pitch intersection point 2 refers to the intersection point related to the first and second matrix node lines that can be connected by note key 1. Figure 9 The note grid contains points indicating note keys 1, totaling 29 pitch intersections 2, corresponding to the 29 notes of the scale. Ordinary intersections 3 refer to the intersections of the first and second matrix node lines that cannot be connected by note keys 1. Figure 9 There are no points indicating the note key 1 within the note squares, totaling 3 ordinary intersections (3).

[0070] Some embodiments of the keyboard electro-acoustic instrument's pitch adjustment circuit also include a plurality of pitch adjustment switches, the same number as the physical number of note keys, in combination with Figure 9 As shown, there are 16 squares with musical notes, each corresponding to one of the 16 musical note keys. The musical notes are as follows: 1, 2, 3, 4, 5, 6, 7 It also has 16 pitch adjustment switches (not shown in the figure).

[0071] Continue to refer to Figure 4 The image shows a pitch adjustment switch (also known as a toggle switch). From top to bottom, the first image shows the switch in the lowered half-tone position, the second image shows the switch in the fundamental tone position, and the third image shows the switch in the raised half-tone position. The physical shapes of the components in the images are not affected by the toggle. Figure 4 The shape is not limited; for example, this invention does not specifically limit the shape of the contact points. The first contact (main slider) of the pitch adjustment switch is electrically connected to the corresponding first matrix node line 6 via the corresponding note button (piano keypad button); the second contact (left contact, middle contact, right contact) of the pitch adjustment switch is adjustablely electrically connected to the corresponding second matrix wire 7 or its adjacent second matrix wire 8, by… Figure 4 As can be seen, the middle contact is connected to the corresponding second matrix wire 7, and the left and right contacts are connected to the adjacent second matrix wires 8 respectively. For example, the main slider is connected to the C0 first matrix node line through the keypad button, the middle contact is connected to the A2 second matrix node line, the left contact is connected to the A1 second matrix node line, and the right contact is connected to the A3 second matrix node line.

[0072] In some embodiments, pitch intersections include basic pitch intersections obtained by the intersection of a corresponding first matrix node line and a corresponding second matrix wire line, and a plurality of basic pitch intersections form a basic pitch matrix; Reference Figure 9 As shown, with The intersection of the corresponding first matrix node line C0 and the corresponding second matrix wire line A2 yields the basic tone intersection point; with The intersection of the corresponding first matrix node line C0 and the corresponding second matrix line B0 yields the fundamental tone intersection point; the intersection of the corresponding first matrix node line C2 and the corresponding second matrix line A2 yields the fundamental tone intersection point. Adjusting the pitch tuning switch so that all 16 pitch intersection points form fundamental tone intersection points, these fundamental tone intersection points constitute the fundamental tone matrix (equivalent to...). Figure 4 The matrix 2 (basic tone) corresponds to the basic tone mode, such as C major.

[0073] In some embodiments, the pitch crossover points further include a half-tone drop crossover point obtained by the intersection of a corresponding first matrix node line and an adjacent second matrix wire line, and a plurality of half-tone drop crossover points form a half-tone drop matrix; Reference Figure 9 As shown, with The intersection of the corresponding first matrix node line C0 and the corresponding second matrix wire line A1 yields a lower semitone intersection point; The first matrix node line C0 and the second matrix line A3 intersect to form a semitone lowered crossover point; the first matrix node line C2 and the second matrix line A1 intersect to form a semitone lowered crossover point. Adjusting the pitch tuning switch so that all 16 pitch crossover points form semitone lowered crossover points, these semitone lowered crossover points constitute a semitone lowered matrix (equivalent to...). Figure 4 The matrix 1 (flat semitone) corresponds to the flat semitone mode.

[0074] In some embodiments, the pitch crossing points further include raised semitone crossing points obtained by the intersection of a corresponding first matrix node line and an adjacent second matrix wire line, and a plurality of raised semitone crossing points form a raised semitone matrix; Reference Figure 9 As shown, with The intersection of the corresponding first matrix node line C0 and the corresponding second matrix wire line A3 yields the semitone crossing point; with The first matrix node line C0 and the second matrix wire line B1 intersect to form a raised semitone intersection; the first matrix node line corresponding to 7 is C2, and the second matrix wire line is A3. Adjusting the pitch tuning switch so that all 16 pitch intersections form raised semitone intersections, these raised semitone intersections constitute a raised semitone matrix (equivalent to...). Figure 4 The matrix 3 (sharp semitone) corresponds to the semitone matrix and is a semitone key.

[0075] It should be noted that the basic tone, semitone flat tone, and semitone sharp tone are merely illustrative examples. By adjusting the positions of the toggle switches, the pitch (sharp or flat) of each of the 16 keys can be changed to form different scale relationships and transform into various desired modes. Because the pitch of the keys can be partially adjusted, it is easy to set different modes in different positions on the keyboard. For example, the first 8 or 16 keys can form one key, and the last 8 or 16 keys can form another mode.

[0076] Comprehensive reference Figure 5 , Figure 6 and Figure 7 Its musical note signal representation method is the same as Figure 9 They are different. Figure 9 The note signals are all determined by a first matrix node line and a second matrix node line selected by the toggle switch; for example, the basic note 7 is determined by the intersection point C2A2. Figure 5 , Figure 6 and Figure 7In addition, the pitch adjustment circuit can also be defined by one first matrix node and two or three second matrix node lines, such as C2A1B1 (two second matrix node lines) and C2A1B1B2 (three second matrix node lines). This configuration allows the pitch adjustment circuit to correspond to more notes, thereby enabling more adjustments. Figure 7 As shown, due to the five positions, five basic modes are obtained. Further reference... Figure 7 As shown, the pitch adjustment switch with the second contact 9 located on the outer circumference of the first contact 10 has more advantages. For example, it is more convenient to set the knob adjustment at the first contact position. In order to increase the selectable tuning, more second contacts and more contacts at the second end of the wave element are set.

[0077] The following description uses an array of pitch adjustment switches to illustrate the pitch-based tuning circuit of the keyboard electro-acoustic instrument of the present invention. The settings in the example are not intended to limit the scope of protection of the present invention.

[0078] In some specific embodiments, the pitch adjustment switch array (also known as a switch array) contains 16 pitch adjustment switches. Reference Figure 9 As shown, the first matrix node lines C0, C1, C2, and C3 form matrix C. The second group of matrix node lines A0, A1, A2, A3, B0, B1, B2, and B3 form matrix 1, representing a lowered semitone; matrix 2, representing a fundamental tone; and matrix 3, representing a raised semitone. Matrix C, matrix 1, and matrix 2 form a switch array.

[0079] When the pitch modulation adjustment switch array is adjusted so that all 16 pitch cross points form a semitone lower cross point, these semitone lower cross points constitute a semitone lower matrix (matrix 1), which corresponds to a semitone lower modulation.

[0080] When the pitch mode adjustment switch is adjusted so that all 16 pitch cross points form basic pitch cross points, these basic pitch cross points constitute a basic pitch matrix (matrix 2), which corresponds to the basic pitch mode, such as C major.

[0081] When the pitch modulation adjustment switch array is adjusted so that all 16 pitch cross points form a raised semitone cross point, these raised semitone cross points constitute a raised semitone matrix (matrix 3), which corresponds to a raised semitone mode.

[0082] Continue to refer to Figure 5 As shown, matrix 1 is the half-tone matrix of the toggle switch, matrix 2 is the fundamental tone matrix of the toggle switch, and matrix 3 is the fundamental tone matrix of the toggle switch. For the pitch-adjusting switch array... The basic tone corresponds to A2 in matrix 2 and C0 in matrix C. Its lowered semitone corresponds to A1 in matrix 1 and C0 in matrix C, and its raised semitone corresponds to A3 in matrix 3 and C0 in matrix C. In other words, by selecting a lowered semitone (left adjacent) or a raised semitone (right adjacent) based on the basic tone, and so on, the pitch effect is achieved by toggling the switch.

[0083] like Figure 6 In some embodiments of the electro-acoustic instrument shown, the pitch adjustment circuit further includes a function selection matrix node line D0, which combines with second matrix node lines A0, A1, A2, A3, B0, B1, B2, B3, etc., to select the beat (four basic beats: 2 / 4, 3 / 4, 4 / 4, and 6 / 8), tempo (tempo+, tempo-), and volume (volume+, volume-). In optional embodiments, the electro-acoustic instrument is equivalent to having an electronic metronome with four basic beats (2 / 4, 3 / 4, 4 / 4, and 6 / 8) and tempos of 40-208 beats per minute, suitable for beat teaching and demonstration accompaniment.

[0084] The power supply method of the electro-acoustic musical instrument of this invention is not fixed; it can have two power supply methods: a 6-volt battery and a Type-C charging port can be used simultaneously, with Type-C power supply taking priority. The electro-acoustic musical instrument of this invention is also equipped with a digital display that can show the operating status such as beat type, beat speed, and overall volume.

[0085] The technical effects of the electroacoustic instrument of this invention are multifaceted, among which its advantage as a sight-singing and ear-training instrument is very obvious. Sight-singing and ear-training teaching refers to one of the skill training contents in music education. Its main tasks are to develop students' musical hearing and musical memory, establish correct pitch and rhythm concepts, cultivate independent music reading ability, and lay the foundation for learning other music teaching materials. Sight-singing teaching mainly takes the method of singing from sight. Primary and secondary school textbooks mostly contain monophonic melodies, using keys with no sharps or flats or one or two sharps, and common time signatures such as 2 / 4, 4 / 4, 3 / 4, and 6 / 8. The pieces are relatively short and the rhythmic combinations are relatively simple.

[0086] refer to Figure 10 The diagram shows the circuit of the sight-singing and ear training board. The pitch adjustment circuit A (matrix) selects the scale, which is output as an audio signal from the sound source circuit B (SAM2695). The volume is controlled by the volume control circuit C (M62429L), and then amplified by the power amplifier circuit D (CS8305E) before being output through the speaker. The display circuit E displays the beat type, beat speed, overall volume, and other operating statuses. The power supply circuit F provides power to both the 6-volt battery and the TYPE-C charging port.

[0087] Although the present invention has been described in detail above with general descriptions, specific embodiments, and experiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A keyboard electro-acoustic instrument played directly on a staff, the keyboard electro-acoustic instrument comprising a processor and a sound source circuit, wherein, This keyboard-based electro-acoustic instrument also includes a staff keyboard and pitch adjustment switches: The staff keyboard includes a staff pitch indication area and note keys arranged in the staff pitch indication area, wherein the angle between the line connecting the geometric center points of the note keys and the parallel horizontal line of the staff is a non-zero angle. The pitch adjustment switch includes: The switch body is used to fix the first contact and several second contacts; A toggle element includes an electrically connected first end and a second end, wherein the first end of the toggle element is electrically connected to a first contact, and the second end of the toggle element is electrically connected to a first contact and at least one second contact. The first contact point has one end electrically connected to the piano key and the other end electrically connected to the toggle switch. The second contact has one end adjustablely connected to the corresponding second matrix node line or its adjacent second matrix node line, and the other end electrically connected to the toggle element.

2. The keyboard electro-acoustic instrument played directly on the staff as described in claim 1, wherein: The second end of the toggle can be electrically connected to one, two, or three second contacts.

3. The keyboard electro-acoustic instrument played directly on the staff as described in claim 1, wherein: The first contact, at one end of which is electrically connected to the toggle element, has the same number of constant contact positions as the second contact.

4. The keyboard electro-acoustic instrument played directly on the staff as described in claim 3, wherein: The second contact is located on one or both sides of the first contact.

5. The keyboard electro-acoustic instrument played directly on the staff as described in claim 4, wherein: The second contact is located on both sides of the first contact.

6. The keyboard electro-acoustic instrument played directly on the staff as described in claim 5, wherein: The first end and the second end of the toggle are respectively electrically connected to the first contact.

7. The keyboard electro-acoustic instrument played directly on the staff as described in claim 1, wherein: The first contact, at the end electrically connected to the toggle element, has one constant contact position.

8. The keyboard electro-acoustic instrument played directly on the staff as described in claim 1, wherein: The second contact is disposed around the first contact.

9. The keyboard electro-acoustic instrument played directly on the staff as described in claim 8, wherein: The second contact is located on the outer circumference of the first contact. One end of the toggle is rotatably electrically connected to the first contact, and the other end of the toggle is electrically connected to any one or more second contacts.

10. A keyboard electro-acoustic instrument played directly on a staff as described in any one of claims 1-9, wherein: The keyboard electro-acoustic instrument also includes a pitch adjustment circuit, which comprises two sets of intersecting matrix node lines and several note keys corresponding to the pitch intersections of the two sets of matrix node lines. The first set of matrix node lines includes several first matrix node lines, and the second set of matrix node lines includes several second matrix node lines. The pitch adjustment circuit also includes several pitch adjustment switches, the same number as the number of note keys, wherein: The first contact of any pitch adjustment switch is electrically connected to the corresponding first matrix node via the corresponding note key; The second contact of any pitch-adjusting switch is electrically connected to the corresponding second matrix node line or its adjacent second matrix node line; The pitch intersections include basic pitch intersections obtained by the intersection of the corresponding first matrix node lines and the corresponding second matrix node lines, and several basic pitch intersections form a basic pitch matrix; adjusting the pitch mode adjustment switch so that the pitch intersections form a basic pitch matrix yields a basic pitch mode; The pitch cross points also include lowered semitone cross points or raised semitone cross points obtained by the intersection of the corresponding first matrix node line and the adjacent second matrix node line. Several lowered semitone cross points form a lowered semitone matrix, and several raised semitone cross points form a raised semitone matrix. Adjusting the pitch mode adjustment switch so that the pitch cross points form a raised semitone matrix or a lowered semitone matrix results in a raised semitone mode or a lowered semitone mode.

11. The keyboard electro-acoustic instrument played directly on the staff as described in claim 10, wherein: The pitch intersections include basic pitch intersections obtained by the intersection of the corresponding first matrix node line and the corresponding second matrix node line. Several basic pitch intersections form a basic pitch matrix. When the pitch mode adjustment switch is adjusted so that all pitch intersections form basic pitch intersections, the basic pitch mode corresponds to the basic pitch matrix. The pitch cross points also include the semitone-flat cross points obtained by the intersection of the corresponding first matrix node line and the adjacent second matrix node line. Several semitone-flat cross points form a semitone-flat matrix. When the pitch mode adjustment switch is adjusted so that all pitch cross points form semitone-flat cross points, these semitone-flat cross points form a semitone-flat matrix, which corresponds to a semitone-flat mode. The pitch cross points also include raised semitone cross points obtained by the intersection of the corresponding first matrix node line and the adjacent second matrix node line. Several raised semitone cross points form a raised semitone matrix. When the pitch mode adjustment switch is adjusted so that the pitch cross points form raised semitone cross points, these raised semitone cross points constitute a raised semitone matrix, which corresponds to a raised semitone mode.

12. The keyboard electro-acoustic instrument played directly on the staff as described in claim 10, wherein: The pitch adjustment switch array contains 16 pitch adjustment switches. The first matrix node lines C0, C1, C2, and C3 form matrix C. The second matrix node lines A0, A1, A2, A3, B0, B1, B2, and B3 form matrix 1, which represents a lowered semitone; matrix 2, which represents the fundamental tone; and matrix 3, which represents a raised semitone. Matrix C, matrix 1, and matrix 2 together form the switch array.

13. The keyboard electro-acoustic instrument played directly on the staff as described in claim 10, wherein, When the pitch and mode adjustment switch is adjusted so that the high crosspoint forms part of the fundamental tone crosspoint, and / or part of the lowered semitone crosspoint, and / or the raised semitone crosspoint, these fundamental tone crosspoints, and / or part of the lowered semitone crosspoint, and / or the raised semitone crosspoint constitute a partial tuning matrix, which corresponds to a partial tuning mode.

14. The keyboard electro-acoustic instrument played directly on the staff as described in claim 10, wherein, The pitch adjustment circuit also includes a function selection matrix node line D0, which, in combination with the second matrix node lines A0, A1, A2, A3, B0, B1, B2, and B3, allows for the selection of beat, tempo, and volume.

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