37results about How to "Does not affect sound quality" patented technology

The invention belongs to the technical field of musical instruments, relates to a page turning device in a piano page turning system, and solves the problems that a piano page turning system in the prior art is great in dependency on an external power supply, and the like. A piano comprises a main body and a supporting column, wherein the supporting column is perpendicularly fixed to the lower surface of the main body; the page turning device comprises a rotary disc which is rotatably arranged on the upper surface of the main body; the side wall of the rotary disc is fixedly equipped with a sucking rod which can move to a position above a music score; a magnet capable of sucking pages of the music score is arranged on the sucking rod; the page turning device further comprises a rotary shaft, wherein the rotary shaft is rotatably arranged on the main body in the vertical direction; a transmission mechanism for enabling the rotary shaft and the rotary disc to synchronously rotate is arranged between the upper end of the rotary shaft and the rotary disc; and the lower end of the rotary shaft is equipped with a plurality of driving levers. The page turning device has the advantage of being capable of turning the music score without an external power supply.

The invention relates to a user-friendly intelligent blind person teaching piano. The user-friendly intelligent blind person teaching piano comprises a body provided with a piano body and piano keys;induction sheets are arranged on the surfaces of all the piano keys; a teaching board is further arranged on the front portion of a panel of the piano keys, and two sets of teaching modules are installed on the teaching board; the teaching modules comprise slide grooves formed in the teaching board, and teaching bases are slidably arranged in the slide grooves; the user-friendly intelligent blindperson teaching piano further comprises two driving cylinders arranged at the two sides of the teaching board, a conveying belt is arranged between the two driving cylinders in a sleeving mode, and the teaching board is fixedly connected with the conveying belt; a computer control board is installed in the body; the user-friendly intelligent blind person teaching piano further comprises teaching gloves, prompting units are arranged at the finger ends of the teaching gloves, and the teaching gloves are further provided with processing chips in wireless connection with a computer control board.The user-friendly intelligent blind person teaching piano is novel in structure and unique in principle, a user can be assisted in efficiently and accurately plucking the piano and learning the piano,the study difficulty is lowered, and the study interaction is improved.

The invention discloses a far-field audio amplification method based on cloud data. The method includes: acquiring far-field audio data through a sound collection device; acquiring and saving the far-field audio data by a recording sound card, and then transmitting the far-field audio data to a processor; The processor converts the far-field audio data into far-field text annotation according to the far-field model database; obtains near-field audio data from the near-field model database according to the far-field text annotation, and the near-field audio data is used for Amplified playback. The invention can amplify the sound without affecting the sound quality of the sound, can remove the noise, effectively avoid the interference caused by the echo, and selectively play the sound in different distance scenes, which is more humanized and makes the sound clearer.

The invention relates to a tilt-shift erhu with a sound window in the waist. The tilt-shift erhu comprises an erhu neck and an erhu canister, the erhu neck is arranged at the upper end of the erhu canister, skin is arranged at one end of the erhu canister, and the sound window is formed in the other end of the erhu canister; the sound window comprises an arc-face sound window body and a polygonal-face sound window body, the arc-face sound window body is located on the front face of the erhu canister, the polygonal-face sound window body is located on the end face of the erhu canister, and the arc-face sound window body and the polygonal-face sound window body are arranged in an adjacent mode; the erhu neck is arranged at the 2 / 5 position of the erhu canister and is close to the skin end. By means of the tilt-shift erhu, as the neck is titled, namely the position of the erhu neck of the erhu is changed, generated high-frequency sounds can be strengthened, and low-frequency vibration can be enlarged; the structure of the erhu canister is changed, the abnormal-shaped sound window is formed in one end of the erhu canister, the problem of vibration of a high sound region can be solved, the sound quality of the high sound region is improved, and the sound quality of a middle sound region and a low sound region is not influenced; the area of the skin and the width of edge skin are controlled, it can be guaranteed that incapability of high sound generation due to the fact that the high sound region is rapidly collapsed is avoided after large pull force is borne, and the tilt-shift erhu is not influenced by the damp environment, and the service life is prolonged.

The invention relates to an Erhu multi-functional adjuster and a main bridge used in cooperation with the same and belongs to the Erhu auxiliary tool technical field. With the Erhu multi-functional adjuster adopted, when an Erhu is not used, the skin of the Erhu can be well protected, and the playing volume of the Erhu can be decreased. The Erhu multi-functional adjuster of the invention comprises a rack body. The Erhu multi-functional adjuster is characterized in that the front end of the rack body is provided with a string channel opening; the frame body is provided with an installation groove; a rod shifting device is arranged in the installation groove; the front end of the rod shifting device is provided with a lifting shifting fork; the lifting shifting fork is corresponding to the string channel opening; a string groove corresponding to the string channel opening is arranged in the rod shifting device; two sides of the rod shifting device are provided with sliding shafts; and the rack body is provided with limiting frames corresponding to the sliding shafts; and the rack body is provided with a locking hook corresponding to the tail end of the rod shifting device.

The invention discloses a high-frequency AC power supply control circuit for an electron tube power amplifier. The high-frequency AC power supply includes a sequentially connected π-type filter circuit, a rectifier circuit, a filter circuit, a load circuit, a power-on start-up circuit and an oscillation circuit; the π-type filter circuit Connected to the mains, the output end of the power-on start-up circuit is connected to the control end of the oscillation circuit, the input end of the oscillation circuit is connected to the filter circuit, and the output end of the oscillation circuit is connected to the input end of the load circuit. Its advantage is that it adopts a new type of electronic tube filament power supply mode, and effectively solves the AC hum of various power sources in the prior art through high-efficiency, high-frequency, high-frequency AC power that neither affects sound quality nor affects the life of the electronic tube. , low power factor and low efficiency; at the same time, it also solves the technical problems that the deflection magnetic field generated by the low-voltage DC power supply affects the electron current emission, and the weakened electron emission kinetic energy affects the life of the electron tube; the key power device protection measures are comprehensive.

The invention relates to an auxiliary device for percussion instruments. A drum muffler comprises a rubber cushion, a supporting rod and a mounting seat and is characterized in that: the rubber cushion is a hollow circular structure or a middle dented basin-shaped structure which is mounted on a supporting plate; the supporting plate is mounted on the left end of the supporting rod; the right end of the supporting rod is mounted on the mounting seat with a rotary pushing mechanism through two rotary shafts; and the rotary pushing mechanism can make the supporting rod rotate by taking the rotary shaft on the right end as the axle centre. The drum muffler has the advantages that: because a cavity is formed in the middle of the rubber cushion, drumsticks do not beat the rubber cushion directly, the hand feel of beating drum skin is better during a practice and resonance is avoided; and thus, good sound attenuation effect is achieved, the problem of disturbing residents is solved and the rubber cushion can be separated from the drum skin and set upright during a normal performance without influence on the tonal quality of the drum. The invention is artful in design, low in cost, easy for popularizing and suitable for various drum percussion instruments.