CN114495639A - Low-delay real-time interactive system for piano teaching - Google Patents
Low-delay real-time interactive system for piano teaching Download PDFInfo
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- CN114495639A CN114495639A CN202210141158.5A CN202210141158A CN114495639A CN 114495639 A CN114495639 A CN 114495639A CN 202210141158 A CN202210141158 A CN 202210141158A CN 114495639 A CN114495639 A CN 114495639A
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- 230000002452 interceptive effect Effects 0.000 title claims abstract description 17
- 238000004891 communication Methods 0.000 claims abstract description 11
- 239000003086 colorant Substances 0.000 claims abstract description 9
- 230000008054 signal transmission Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 47
- 230000004044 response Effects 0.000 claims description 18
- 230000011664 signaling Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 3
- 230000006870 function Effects 0.000 abstract description 6
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B15/00—Teaching music
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/0008—Associated control or indicating means
- G10H1/0016—Means for indicating which keys, frets or strings are to be actuated, e.g. using lights or leds
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/0033—Recording/reproducing or transmission of music for electrophonic musical instruments
- G10H1/0041—Recording/reproducing or transmission of music for electrophonic musical instruments in coded form
- G10H1/0058—Transmission between separate instruments or between individual components of a musical system
- G10H1/0066—Transmission between separate instruments or between individual components of a musical system using a MIDI interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
Abstract
The invention belongs to the field of piano teaching, in particular to a low-delay real-time interactive system for piano teaching, which is characterized in that: the electronic piano or MIDI equipment of the teacher or the student is connected with the computer equipment through a MIDI data cable; MIDI signal transmission: the browser transmits and receives MIDI signal data through a communication protocol between the electronic musical instrument and the computer; changing the color of the numerical value corresponding to the key; after receiving MIDI signal data, outputting the note elements corresponding to the keys through the keyboard pressing events of the webpage scripting language, converting the note elements from white or black into data of other colors, and outputting the note elements reversely when the keyboard bounces up the events; transmitting MIDI signal data by using a WebRTC protocol; pushing the stream to a cloud streaming media server; the audio and HTML5 simulated piano pictures are pushed to the cloud streaming media server through the WebRTC protocol in a low-delay mode, so that teachers or students can visually see the functions of specific keys when playing the piano.
Description
Technical Field
The invention relates to the field of piano teaching, in particular to a low-delay real-time interactive system for piano teaching.
Background
The piano is a keyboard instrument among the western classical musical instruments, and the mode of online and offline is mostly adopted when teaching the piano now, and the mode of live teaching is mostly adopted when teaching the piano online now.
At present in the direct teaching of piano, want to realize the interaction that the piano was played, need carry out the real-time interaction of audio frequency and video through mr and student and link the wheat and accomplish, mr and student watch both sides' playing process through the camera picture.
The conventional piano live broadcast teaching system has the advantages that teachers and students cannot visually see specific key positions played by the other side when playing the piano, and sound quality is influenced by the environment when playing the piano, so that the situations of unclear visibility and unclear listening occur to both the live broadcast teaching students and the teachers, and the teaching efficiency and effect are not ideal; therefore, a low-delay real-time interactive system for piano teaching is provided for solving the problems.
Disclosure of Invention
In order to make up for the defects of the prior art, the problems that teachers and students of the existing piano live broadcast teaching system cannot visually see the specific key positions played by the other side when playing the piano, and sound quality is influenced by the environment when playing the piano, so that the live broadcast teaching students and the teachers cannot see clearly and hear clearly, and the teaching efficiency and the teaching effect are not ideal are solved.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a low-delay real-time interactive system for piano teaching, which comprises the following steps:
s1: equipment connection: the electronic piano or MIDI equipment of the teacher or the student is connected with the computer equipment through a MIDI data cable;
s2: MIDI signal transmission: the browser transmits and receives MIDI signal data through a communication protocol between the electronic musical instrument and the computer;
s3: changing the color of the numerical value corresponding to the key; after receiving MIDI signal data, the keyboard of the webpage script language presses down the event to output the note elements corresponding to the keys to be converted into data with other colors from white or black, and the keyboard bounces up the event to output the event to be converted into the original white or black from other colors;
s4: transmitting MIDI signal data by using a WebRTC protocol;
s5: and pushing the stream to a cloud streaming media server.
Preferably, the communication protocol between the electronic musical instrument and the computer in S2 is specifically a Web service protocol, a MIDI communication protocol or an API interface protocol.
Preferably, the web page scripting language in S3 is JavaScript, the keyboard press event in S3 is KeyDown, the note element corresponding to the key in S3 is DIV, and the keyboard pop-up event in S3 is KeyUp.
Preferably, the specific execution method after the WebRTC protocol is changed to transmit the MIDI signal data in S4 is as follows:
a1: the MIDI equipment A firstly creates a link object of a local end machine and a remote machine, namely a PeerConnection object, encapsulates audio and video data into a stream of media content, namely a MediaStream, and adds the stream of the media content into the PeerConnection object;
a2: the MIDI equipment A calls a createOffer method in the PeerConnection object to create an SDP object for offer, the createOffer method firstly obtains the locally supported audio and video coding format and transmits the audio and video coding format to the opposite terminal for negotiation, and then sends the SDP object packet data to the MIDI equipment B through a Signal signaling server;
a3: the MIDI device B receives an offer SDP object sent by the MIDI device A, saves the offer SDP object by a SetLocalDescription method of the PeerConnection object, saves a response SDP object by a SetLocalDescription method of the PeerConnection object and sends the response SDP object to the MIDI device A by a Signal signaling server, wherein the SetLocalDescription method has the function of changing description related to connection, and the offer of the connection is usually from data sent by a server responsible for matching;
a4: the MIDI equipment A receives the response SDP object sent by the MIDI equipment B and stores the response SDP object by a SetRemoteDescription method of the PeerConnection object;
a5: in the offer/answer flow of the SDP information, the MIDI device a and the MIDI device B have already created the corresponding audio Channel and video Channel according to the SDP information and started the collection of Candidate data;
a6: after MIDI equipment A collects the Candidate information, the PeerConnection object sends a notice to MIDI equipment A through an event trigger OnIcCandidate interface, the MIDI equipment A sends the received Candidate information to MIDI equipment B through a Signal signaling server, the MIDI equipment B stores the Candidate information through an AddIceCandidate method of the Petri connection object, and the operation is repeated when the MIDI equipment B collects the Candidate information;
a7: the method comprises the steps that a P2P channel for audio and video transmission is successfully established between a MIDI device A and a MIDI device B, the MIDI device B receives an audio and video stream transmitted by the MIDI device A, a MediaStream object for identifying the audio and video stream at the end of the MIDI device A is returned through an OnAddStream callback interface of a PeerConnection object, the MIDI device B renders the MediaStream object, and the method is also adopted for transmitting the audio and video stream from the MIDI device B to the MIDI device A.
Preferably, the specific steps transmitted to the opposite end in a2 for negotiation include:
b1: executing a clearing action to avoid the pointer pointing to invalid data;
b2: if the current coding information is not null, which indicates that the CreateOffer is not executed for the first time, then the current coding information is recorded and stored in the SDP object;
b3: calling a SetLocalDescription method of PeerConnection to match the local end coding format, receiving a single parameter in the session description by the SetLocalDescription method, returning a commitment, realizing the commitment once the description is asynchronously changed, and completing the negotiation until the configuration of two peers is consistent.
Preferably, the setremoteddescription method in a3 specifically calls the method to set up remote description, then generates a reply packet, namely an answer, sent to the peer computer, and calls a createnanswer method of the PeerConnection object to create an SDP object of a reply, where the createnanswer method creates an SDP answer for a offer received from a remote peer during offer/answer negotiation of the WebRTC connection.
Preferably, the Candidate data in a5 includes IP address information of the MIDI device, i.e., a local IP address, a public network IP address, and an address assigned by the Relay server.
Preferably, the step S5 is to capture HTML5 simulated piano interface data and transmit the data to the cloud streaming media server, and the cloud streaming media server receives the data packet of the audio/video stream and sends the data packet through the network port in the TS or RTP packet format.
The invention has the advantages that:
the invention connects HTML5 analog piano through electronic piano or MIDI equipment to transmit MIDI signal, receives MIDI signal, changes color of numerical value corresponding to the key through JavaScript plus CSS, the WebRTC protocol pushes audio and HTML5 analog piano picture to the cloud streaming media server with low delay, realizes improving piano tone quality during online teaching, enables teachers or students to visually see specific key when playing the piano, solves the problems that teachers and students of the prior piano direct broadcast teaching system can not visually see specific key position played by the other side when playing the piano and the sound transmission can be influenced by environment when playing the piano, thereby leading the students and the teachers to have unclear and inaudible conditions, leading the teaching efficiency and effect to be unsatisfactory, leading the contents played by the teachers and the students to be synchronously displayed to the other side in real time, the scene of piano teaching under the line has basically been agreed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic overall flow diagram of the present invention;
FIG. 2 is a flowchart illustrating a specific implementation of S4 according to the present invention;
fig. 3 is a schematic flow chart of a2 according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1 to 3, a low-latency real-time interactive system for piano teaching, the real-time interactive system comprising the steps of:
s1: equipment connection: the electronic piano or MIDI equipment of the teacher or the student is connected with the computer equipment through a MIDI data cable;
s2: MIDI signal transmission: the browser transmits and receives MIDI signal data through a communication protocol between the electronic musical instrument and the computer;
s3: changing the color of the numerical value corresponding to the key; after receiving MIDI signal data, the keyboard of the webpage script language presses down the event to output the note elements corresponding to the keys to be converted into data with other colors from white or black, and the keyboard bounces up the event to output the event to be converted into the original white or black from other colors;
s4: transmitting MIDI signal data by using a WebRTC protocol;
s5: and pushing the flow to a cloud streaming media server.
The communication protocol between the electronic musical instrument and the computer in S2 is specifically a Web service protocol, a MIDI communication protocol or an API interface protocol.
The web page scripting language in S3 is JavaScript, the keyboard pressing event in S3 is KeyDown, the note element corresponding to the key in S3 is DIV, and the keyboard bounce event in S3 is KeyUp.
The specific execution method after the WebRTC protocol is changed to transmit the MIDI signal data in S4 is as follows:
a1: the MIDI equipment A firstly creates a link object of a local end machine and a remote machine, namely a PeerConnection object, encapsulates audio and video data into a stream of media content, namely a MediaStream, and adds the stream of the media content into the PeerConnection object;
a2: the MIDI equipment A calls a createOffer method in the PeerConnection object to create an SDP object for offer, the createOffer method firstly obtains the locally supported audio and video coding format and transmits the audio and video coding format to the opposite terminal for negotiation, and then sends the SDP object packet data to the MIDI equipment B through a Signal signaling server;
a3: the MIDI device B receives an offer SDP object sent by the MIDI device A, saves the offer SDP object by a SetLocalDescription method of the PeerConnection object, saves a response SDP object by a SetLocalDescription method of the PeerConnection object and sends the response SDP object to the MIDI device A by a Signal signaling server, wherein the SetLocalDescription method has the function of changing description related to connection, and the offer of the connection is usually from data sent by a server responsible for matching;
a4: the MIDI equipment A receives the response SDP object sent by the MIDI equipment B and stores the response SDP object by a SetRemoteDescription method of the PeerConnection object;
a5: in the offer/answer flow of the SDP information, the MIDI device a and the MIDI device B have already created the corresponding audio Channel and video Channel according to the SDP information and started the collection of Candidate data;
a6: after MIDI equipment A collects the Candidate information, the PeerConnection object sends a notice to MIDI equipment A through an event trigger OnIcConnection interface, the MIDI equipment A sends the received Candidate information to MIDI equipment B through a Signal signaling server, the MIDI equipment B is stored through an AddIceCandidate method of the PetrConnection object, the operation is repeated when the MIDI equipment B collects the Candidate information, the OnIcConnection event trigger has the function of enabling the function to be called when the time occurs on the instance PeerConnection, and the AddInceCandidate method is used for adding an ICE (ICE is a frame for interactive connection establishment, and the algorithm of the frame is to search a path with the lowest waiting time to connect two ends) Candidate address information agent;
a7: the method is also adopted for the transmission of the audio and video stream from the MIDI equipment B to the MIDI equipment A, the OnAddStream callback interface is an event processing function, and the aim is to send an event after the media stream of the remote media stream is added to the connection and to immediately call the event after the SetRemoteDescription is called without waiting for the completion of SDP exchange.
The specific steps transmitted to the opposite end in a2 for negotiation are as follows:
b1: executing a clearing action to avoid the pointer pointing to invalid data;
b2: if the current coding information is not null, which indicates that the CreateOffer is not executed for the first time, then the current coding information is recorded and stored in the SDP object;
b3: calling a SetLocalDescription method of PeerConnection to match the local end coding format, receiving a single parameter in the session description by the SetLocalDescription method, returning a commitment, realizing the commitment once the description is asynchronously changed, and completing the negotiation until the configuration of two peers is consistent.
Specifically, the setremoteddescription method in a3 calls the method to set a remote description, then generates a response packet, that is, an answer, sent to the peer computer, and calls a createnanswer method of the PeerConnection object to create an SDP object of a response, where the createnanswer method creates an SDP response for a provision received from a remote peer during a provision/response negotiation of a WebRTC connection.
The Candidate data in a5 is the IP address information of the MIDI device, i.e. the local IP address, the public network IP address, and the address assigned by the Relay server.
The S5 is specifically configured to capture HTML5 simulated piano interface data and transmit the data to the cloud streaming media server, and the cloud streaming media server receives the data packet of the audio/video stream and sends the data packet through the network port in the TS or RTP packet format.
The working principle is as follows: equipment connection: the electronic piano or MIDI equipment of the teacher or the student is connected with the computer equipment through a MIDI data cable; MIDI signal transmission: the browser transmits and receives MIDI signal data through a communication protocol between the electronic musical instrument and the computer; changing the color of the numerical value corresponding to the key; after receiving MIDI signal data, the keyboard of the webpage script language presses down the event to output the note elements corresponding to the keys to be converted into data with other colors from white or black, and the keyboard bounces up the event to output the event to be converted into the original white or black from other colors; transmitting MIDI signal data by using a WebRTC protocol; and pushing the flow to a cloud streaming media server.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (8)
1. The utility model provides a piano teaching of low delay is with real-time interactive system which characterized in that: the real-time interaction system comprises the following steps:
s1: equipment connection: the electronic piano or MIDI equipment of the teacher or the student is connected with the computer equipment through a MIDI data cable;
s2: MIDI signal transmission: the browser transmits and receives MIDI signal data through a communication protocol between the electronic musical instrument and the computer;
s3: changing the color of the numerical value corresponding to the key; after receiving MIDI signal data, the keyboard of the webpage script language presses down the event to output the note elements corresponding to the keys to be converted into data with other colors from white or black, and the keyboard bounces up the event to output the event to be converted into the original white or black from other colors;
s4: transmitting MIDI signal data by using a WebRTC protocol;
s5: and pushing the flow to a cloud streaming media server.
2. The real-time interactive system for piano teaching of claim 1, wherein: the communication protocol between the electronic musical instrument and the computer in S2 is specifically a Web service protocol, a MIDI communication protocol or an API interface protocol.
3. The real-time interactive system for piano teaching of claim 2, wherein: the web page scripting language in S3 is JavaScript, the keyboard pressing event in S3 is KeyDown, the note element corresponding to the key in S3 is DIV, and the keyboard bounce event in S3 is KeyUp.
4. The real-time interactive system for piano teaching of claim 3, wherein: the specific execution method after the WebRTC protocol is changed to transmit the MIDI signal data in S4 is as follows:
a1: the MIDI equipment A firstly creates a link object of a local end machine and a remote machine, namely a PeerConnection object, encapsulates audio and video data into a stream of media content, namely a MediaStream, and adds the stream of the media content into the PeerConnection object;
a2: the MIDI equipment A calls a CreateOffer method in the Peerconnection object to create an SDP object for offer, the CreateOffer method firstly obtains locally supported audio and video coding formats, transmits the audio and video coding formats to an opposite terminal for negotiation, and then sends SDP object packet data to MIDI equipment B through a Signal signaling server;
a3: the MIDI device B receives an offer SDP object sent by the MIDI device A, saves the offer SDP object by a SetLocalDescription method of the PeerConnection object, saves a response SDP object by a SetLocalDescription method of the PeerConnection object and sends the response SDP object to the MIDI device A through a Signal signaling server;
a4: the MIDI equipment A receives the response SDP object sent by the MIDI equipment B and stores the response SDP object by a SetRemoteDescription method of the PeerConnection object;
a5: in the offer/answer flow of the SDP information, the MIDI device a and the MIDI device B have already created the corresponding audio Channel and video Channel according to the SDP information and started the collection of Candidate data;
a6: after MIDI equipment A collects the Candidate information, the PeerConnection object sends a notice to MIDI equipment A through an event trigger OnIcCandidate interface, the MIDI equipment A sends the received Candidate information to MIDI equipment B through a Signal signaling server, the MIDI equipment B stores the Candidate information through an AddIceCandidate method of the Petri connection object, and the operation is repeated when the MIDI equipment B collects the Candidate information;
a7: the method comprises the steps that a P2P channel for audio and video transmission is successfully established between a MIDI device A and a MIDI device B, the MIDI device B receives an audio and video stream transmitted by the MIDI device A, a MediaStream object for identifying the audio and video stream at the end of the MIDI device A is returned through an OnAddStream callback interface of a PeerConnection object, the MIDI device B renders the MediaStream object, and the method is also adopted for transmitting the audio and video stream from the MIDI device B to the MIDI device A.
5. The real-time interactive system for piano teaching of claim 4, wherein: the specific steps transmitted to the opposite end in a2 for negotiation are as follows:
b1: executing a clearing action to avoid the pointer pointing to invalid data;
b2: if the current coding information is not null, which indicates that the CreateOffer is not executed for the first time, then the current coding information is recorded and stored in the SDP object;
b3: calling a SetLocalDescription method of PeerConnection to match the local end coding format, receiving a single parameter in the session description by the SetLocalDescription method, returning a commitment, realizing the commitment once the description is asynchronously changed, and completing the negotiation until the configuration of two peers is consistent.
6. The real-time interactive system for piano teaching of claim 5, wherein: specifically, the setremoteddescription method in a3 is to call the method to set up remote description, then generate a response packet, i.e., an answer, sent to the peer computer, and call the createnanswer method of the PeerConnection object to create an SDP object of a response.
7. The real-time interactive system for piano teaching of claim 6, wherein: the Candidate data in a5 is the IP address information of the MIDI device, i.e. the local IP address, the public network IP address, and the address assigned by the Relay server.
8. The real-time interactive system for piano teaching of claim 7, wherein: the S5 is specifically configured to capture HTML5 simulated piano interface data and transmit the data to the cloud streaming media server, and the cloud streaming media server receives the data packet of the audio/video stream and sends the data packet through the network port in the TS or RTP packet format.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015192674A1 (en) * | 2014-06-20 | 2015-12-23 | 北京趣乐科技有限公司 | Intelligent piano and system |
| CN107342067A (en) * | 2017-08-01 | 2017-11-10 | 广州丰谱信息技术有限公司 | A kind of rolling type musical alphabet roll call is with tune matched display device |
| CN109256010A (en) * | 2018-12-03 | 2019-01-22 | 上和弦（北京）音乐科技有限公司 | A kind of music teaching demo system |
| CN208489492U (en) * | 2018-08-30 | 2019-02-12 | 温州市优克电气科技有限公司 | A kind of rail type insert row device |
| CN110779697A (en) * | 2019-10-31 | 2020-02-11 | 苏州富强科技有限公司 | Switch detection method and device and switch function detection device |
| GB202001752D0 (en) * | 2020-02-10 | 2020-03-25 | Wells Paul William | Piano teacing system and metho of use |
| CN112073423A (en) * | 2020-09-15 | 2020-12-11 | 杭州二更网络科技有限公司 | Browser plug-flow method and system based on WebRTC |
-
2022
- 2022-02-16 CN CN202210141158.5A patent/CN114495639B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015192674A1 (en) * | 2014-06-20 | 2015-12-23 | 北京趣乐科技有限公司 | Intelligent piano and system |
| CN107342067A (en) * | 2017-08-01 | 2017-11-10 | 广州丰谱信息技术有限公司 | A kind of rolling type musical alphabet roll call is with tune matched display device |
| CN208489492U (en) * | 2018-08-30 | 2019-02-12 | 温州市优克电气科技有限公司 | A kind of rail type insert row device |
| CN109256010A (en) * | 2018-12-03 | 2019-01-22 | 上和弦（北京）音乐科技有限公司 | A kind of music teaching demo system |
| CN110779697A (en) * | 2019-10-31 | 2020-02-11 | 苏州富强科技有限公司 | Switch detection method and device and switch function detection device |
| GB202001752D0 (en) * | 2020-02-10 | 2020-03-25 | Wells Paul William | Piano teacing system and metho of use |
| CN112073423A (en) * | 2020-09-15 | 2020-12-11 | 杭州二更网络科技有限公司 | Browser plug-flow method and system based on WebRTC |
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