WO2023160545A1

WO2023160545A1 - Electronic keyboard instrument

Info

Publication number: WO2023160545A1
Application number: PCT/CN2023/077425
Authority: WO
Inventors: 蒋恩良
Original assignee: 蒋恩良
Priority date: 2022-02-22
Filing date: 2023-02-21
Publication date: 2023-08-31
Also published as: CN116168669A; CN115206272A

Abstract

The present invention provides an electronic keyboard instrument, and relates to the technical field of electronics. The electronic keyboard instrument comprises keys, carbon film contacts under the keys and sound source chips on a mainboard; the left hand and right hand or each finger playing the keyboard instrument respectively correspond to one or a group of mutually independent sound source chips; switch circuits are arranged between the conductive keys and the mutually independent sound source chips corresponding to the left hand and right hand or to each finger and disposed below the conductive keys; each switch circuit comprises a direct-current power supply and an optocoupler group identical in number to the number of keys, or comprises a single-chip microcomputer circuit and an optocoupler group identical in number to the number of keys; the switch circuits are connected via control lines to wire output ends on conductive gloves, and when two hands or a plurality of fingers wearing the conductive gloves simultaneously press the keys, the optocoupler groups in the switch circuits connected to the corresponding sound source chips are activated, further turning-on pins corresponding to the related sound source chips, thus playing stereophonic sounds of different sound sources.

Description

electronic keyboard instrument

technical field

The invention relates to the field of electronic technology, in particular to an electronic keyboard musical instrument.

Background technique

There are conductive rubber and printed circuit boards under the keys of traditional electronic pianos and electronic pianos. Carbon film contacts are arranged on the printed circuit boards. In the double force-sensitive key structure, the carbon film contacts under each key are usually divided into four parts. We call the two interconnected contacts public carbon film contacts, which can also be called C-area carbon film contacts, and the other two contacts are called non-public carbon film contacts, which can also be called A-area carbon film contacts. Membrane contacts and carbon film contacts in Zone B.

Modern electronic pianos generally use pcm sampling sound sources. The so-called sampling is to record the sound of an instrument, digitize it and store it in rom or flash, and then, when the key is pressed, the cpu or dsp chip plays back the sound. We call a chip that can store and playback sampled audio sources a sound source chip. The pins of the sound source chip include pins of area A, pins of area C and pins of area B corresponding to the carbon film contacts of different partitions. Different electronic keyboard instruments have different sound source chips, and the connection relationship of the pins is also different. of.

In the keyboard instrument of double force sensing structure, the carbon film contacts of the A zone, C zone and B zone below each key are not independent on the printed circuit board with the carbon film contacts of the same subregion below the other keys. After matrix synthesis, it is connected to the corresponding pins of the audio source chip on the main board through row wires. Press the key, under the action of the conductive rubber, the carbon film contacts in the A area and C area and the carbon film contacts in the B area and C area are successively conducted, and the corresponding pins of the sound source chip are also successively conducted, and the Trigger the circuit inside the sound source chip of the electronic organ or electronic piano to make a sound, realize the function of the force key, and also realize the function of the switch.

Playing with both hands on the keyboard of a traditional electronic organ or electronic piano, the content played by the left and right hands cannot be separated in terms of the sound source. No matter how many keys are played at the same time, the sound will be mixed together, which cannot reflect the sense of direction and layering. In addition, with dual and multitimbral modes, the sound source of each timbre is not independent.

Contents of the invention

On the key surface of an electronic organ or electronic piano, we hope that the content played by both hands can be independent of each other in terms of sound sources. When the left and right hands touch the keys at the same time, the corresponding sound source will sound at the same time; When the finger touches the keys, it will control different corresponding sound source chips, and when multiple keys are played at the same time, multiple relatively independent sound source individuals will work at the same time.

In order to solve the above-mentioned technical deficiencies that traditional electronic keyboard instruments exist, the present invention provides a kind of electronic keyboard instrument with stereophonic function:

An electronic keyboard instrument, including keys and carbon film contacts under the keys, and a sound source chip on the motherboard of a traditional electronic keyboard instrument;

The left, right hand or each finger of playing the keyboard corresponds to one or a group of relatively independent sound source chips;

Two or more of the sound source chips share a layer of keys and carbon film contacts under the keys;

The keys are conductive keys;

The carbon film contacts are relatively independent;

A switch circuit is arranged between the conductor key and the relatively independent carbon film contact below it and the sound source chip corresponding to the left hand, the right hand or each finger; the switch circuit includes lights consistent with the number of keys coupling group;

Playing electronic keyboard instruments with conductive keys requires the use of conductive gloves with finger leads;

The switch circuit is connected to the wire output end on the conductor glove through a control wire;

Wearing the left, right hand or a certain finger of the conductive glove, playing any of the conductive keys can realize the control of the corresponding optocoupler group in the related switching circuit, and further realize the control of the related sound source chip. Corresponding pin control. The beneficial effect produced by adopting the above-mentioned technical scheme: the application of relatively independent two or more electronic keyboard musical instrument individuals, the left, right hand or each finger corresponds to one or a group of sound source chips respectively, the application of conductor keyboards and conductor gloves, and The switch circuit between the relatively independent carbon film contacts and the sound source chip is arranged under the keyboard. On the first layer of the keyboard, when two hands or multiple fingers wearing conductive gloves play the keys at the same time, the corresponding sound source chip will be activated. The optocoupler group in the switch circuit further conducts the corresponding pins of the relevant sound source chip to play stereo with different sound sources.

The above technical solution is equivalent to a switch circuit corresponding to the left, right hand or each finger. When the left, right hand or each finger presses different keys at the same time, a current loop is not allowed to be formed between the different switch circuits, otherwise the electronic circuit cannot be realized. Stereo function for keyboard instruments. Through the following different circuit structures, it can be ensured that two or more switching circuits do not form current loops with each other when they work at the same time.

In the switch circuit that forms the stereo electronic keyboard instrument, the DC power supply is combined with the optocoupler group. We call the circuit that does not require a conductor keyboard or a conductor glove a type A circuit, and the combination of two type A circuits is called an AA combination. circuit;

In the switching circuit that forms the stereo electronic keyboard instrument, the DC power supply is combined with the optocoupler group. We call the circuit that needs to use the conductor keyboard and the conductor glove a B-type circuit, and the combination of two B-type circuits is called the BB combination circuit. The carbon film contacts can be directly connected to the corresponding pins of the audio chip through the output end of the optocoupler in the optocoupler group. This method cannot realize the sound superimposed stereo sound. We call the BB combination circuit that cannot realize the sound superimposed stereo function the old BB Combined circuit, the carbon film contact can also only control the input end of the optocoupler in the optocoupler group. When the optocoupler is activated and the output end is turned on, it can also turn on the corresponding pin of the audio chip connected to the output end at the same time. There are several ways to achieve tone stacking Plus stereo, we call the BB combination circuit that can realize the function of timbre superposition stereo called the new BB combination circuit;

In the switch circuit that forms the stereo electronic keyboard instrument, the combination of the single-chip microcomputer circuit and the optocoupler group, we call the circuit that needs to use the conductor keyboard and the conductor glove as a C-type circuit, and the combination of two or more C-type circuits is called a C-type circuit. CC combination circuit. We call the CC combination circuit that cannot realize the stereo function of timbre superposition as the old CC combination circuit. We call the CC combination circuit that can realize the function of superimposing timbre stereo sound as the new CC combination circuit;

In the switch circuit that makes up the stereo electronic keyboard instrument, a type A circuit and a type B circuit are combined, and the type A circuit can be controlled by the type B circuit, or the type B circuit can be controlled by the type A circuit, which is called AB combination circuit. We call the AB combination circuit that cannot realize the stereo function of timbre superimposition the old AB combination circuit. We call the AB combination circuit that can realize the function of timbre superimposing stereophony new AB combination circuit.

The technical scheme of the new AB combination switch circuit:

The switch circuit includes a left channel switch circuit and a right channel switch circuit, both of the left channel switch circuit and the right channel switch circuit include an independent DC power supply and an optocoupler group consistent with the number of keys, wherein, Each of the optocoupler groups in the right channel switch circuit is controlled with the first optocoupler normally closed solid state relay and the second optocoupler normally closed solid state relay, the first optocoupler normally closed solid state relay and the The second optocoupler normally closed solid state relay is controlled by the left channel switch circuit. When the left hand wearing a conductive glove hits the key, the corresponding optocoupler group in the left channel switch circuit will be activated, and at the same time, the corresponding photocoupler group in the right channel switch circuit under the same key will be closed through the corresponding optocoupler normally closed solid-state relay. Optocoupler group. In the left channel switch circuit, the optocoupler group is arranged between the positive wire of the left channel DC power supply and the relatively independent carbon film contacts in area A and carbon film contacts in area B under the conductor keys, The negative wire of the left channel DC power supply is connected to the wire output terminal on the left channel conductor glove; the carbon film contacts in the C area are connected to the corresponding conductor keys.

In the right channel switch circuit, after the positive wire of the right channel DC power supply passes through the positive and negative poles of the output terminal of the second optocoupler normally closed solid-state relay, the carbon in the A area relatively independent of the conductor key below The optocoupler group is arranged between the film contact and the carbon film contact in the B area; the carbon film contact in the C area passes through the positive and negative poles of the output terminal of the first optocoupler normally closed solid state relay, and is connected with the The negative lead wire of the right channel DC power supply is connected.

The positive poles of the input terminals of the first optocoupler normally closed solid state relay and the second optocoupler normally closed solid state relay are connected to the positive lead wire of the DC power supply in the left channel switch circuit, and the first optocoupler The negative poles of the normally closed solid state relay and the input end of the second optocoupler normally closed solid state relay are connected to the corresponding conductor keys through carbon film contacts in the C area.

In the left and right channel switch circuits, each optocoupler group in each switch circuit includes the first optocoupler corresponding to the carbon film contacts of the A area and C area under the keyboard and the first optocoupler corresponding to the B area and C area below the keyboard. Carbon film contacts correspond to the second optocoupler.

The carbon film contacts in area A below the keyboard are respectively connected to the input terminals of the first optocoupler in the corresponding optocoupler group in each switch circuit. The negative electrode is connected, and the carbon film contacts in area B under the keyboard are respectively connected to the negative electrode of the input terminal of the second optocoupler in the corresponding optocoupler group in each switch circuit.

In each switch circuit, the positive and negative pins of the output terminals of each optocoupler in the optocoupler group are respectively connected to the same output pins of the optocouplers at the same position in other optocoupler groups of the same circuit through the matrix key rule of traditional electronic keyboard instruments. Carry out matrix synthesis, and then connect to the corresponding pins of the related audio chip.

The working principle of the new AB combination switch circuit:

In the left channel switch circuit, an optocoupler group is arranged between the DC power supply and the carbon film contacts under the conductive keyboard, and the left hand wearing a conductive glove hits the key, and the optocoupler in the optocoupler group will form a current loop and be activated. When the left hand touches the key, the optocoupler in the optocoupler group corresponding to the right channel is turned off through the optocoupler normally closed solid-state relay arranged in the right channel circuit.

In the right channel switch circuit, when the left hand does not touch the key, the optocoupler in the optocoupler group is in the conduction state. The positive wire of the DC power supply is connected to the positive pole of the input terminal of the optocoupler group through an optocoupler normally closed solid-state relay output terminal, and the negative pole of the input terminal of the optocoupler in the optocoupler group is connected to the A-zone contact and the B-zone contact of the carbon film contacts. One-to-one connection, the right finger touches the key, the carbon film contacts of A and C are in contact with the carbon film contacts of B and C, and the carbon film contact of area C is connected to the negative pole of the DC power supply through the output terminal of the first optocoupler normally closed solid state relay Connecting wires will form a current loop.

The fingers of both hands play different keys at the same time, the two switch circuits work at the same time, and the optocouplers in the corresponding optocoupler groups in the two circuits can be activated at the same time. The pin will be turned on, and two-channel stereo can be played.

Because the left channel switch circuit will close the right channel switch circuit when it is working under the same key, the left channel switch circuit will not be affected when the right hand without finger wire touches the key, so the fingers of both hands play different keys at the same time, and it will not pass through. The finger wires allow a current loop to be formed between the corresponding left and right sound channel optocoupler groups under the same key.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only For the embodiments of the present invention, those skilled in the art can also obtain other drawings according to the provided drawings without any creative effort.

Fig. 1 is the schematic diagram of circuit connection related to the new AB combination structure of the electronic keyboard instrument provided by the embodiment of the present invention;

Fig. 2 is the electronic keyboard musical instrument old AB combined structure related circuit connection schematic diagram that the embodiment of the present invention provides;

Fig. 3 is the schematic block diagram of the new CC combination structure of the electronic keyboard instrument provided by the embodiment of the present invention;

Fig. 4 is the schematic block diagram of the old CC combined structure of the electronic keyboard instrument provided by the embodiment of the present invention;

Fig. 5 is a schematic diagram of circuit connections related to the new BB combination structure of the electronic keyboard musical instrument provided by the embodiment of the present invention;

Fig. 6 is a schematic diagram of circuit connections related to the old BB combination structure of the electronic keyboard instrument provided by the embodiment of the present invention;

Fig. 7 is a schematic diagram of the fixed structure of the AA combined partition of the electronic keyboard musical instrument provided by the embodiment of the present invention;

Fig. 8 is a schematic diagram of an electronic keyboard musical instrument AA combined partition adjustable structure provided by an embodiment of the present invention;

Fig. 9 is a schematic diagram of an electronic keyboard instrument timbre superimposed stereo dual timbre provided by an embodiment of the present invention;

10 is a schematic diagram of the connection between the optocoupler and the different pins of the audio source chip in the optocoupler group in the old AB combination switch circuit, the old CC combination switch circuit and the old BB combination switch circuit provided by the embodiment of the present invention;

Fig. 11 is a schematic diagram of the connection between the optocoupler and the different pins of the audio source chip in the optocoupler group in the new AB combination switch circuit, the new CC combination switch circuit, the new BB combination switch circuit and the AA combination switch circuit provided by the embodiment of the present invention;

Fig. 12 is a schematic diagram of the connection between the carbon film contacts under the keys of the traditional electronic keyboard instrument and the corresponding pins of the sound source chip provided by the embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In this application, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none. other elements specifically listed, or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Specific implementation mode 1: new AB combination circuit

Fig. 1 is a structural schematic diagram of the new AB combination switch circuit of the electronic keyboard instrument. AB101 in the figure is a conductor keyboard. AB102 is a carbon film contact in A zone. AB103 is a carbon film contact in C area. AB104 is a carbon film contact in area B. AB105 is the left channel conductor glove. AB106 is the wire output terminal on the conductor glove. AB107 is the left channel DC power supply. AB108 is the first optocoupler for the left channel. AB109 is the second optocoupler for the left channel. AB110 is the left channel audio chip. AB111 is the A area pin of the left channel audio source chip. AB112 is the C area pin of the left channel audio source chip. AB113 is the pin of area B of the left channel audio source chip. AB114 is the right channel DC power supply. AB115 is the first optocoupler normally closed solid state relay. AB116 is the first optocoupler for the right channel. AB117 is the second optocoupler for the right channel. AB118 is the second optocoupler normally closed solid state relay. AB119 is the right channel audio chip. AB120 is the A area pin of the right channel audio source chip. AB121 is the C area pin of the right channel audio source chip. AB122 is the pin of area B of the right channel audio source chip.

In the embodiment of this new AB combination switch circuit:

(1) Apply two or two groups of relatively independent sound source chips, corresponding to the left hand and right hand of playing keyboard instruments respectively, and two or two groups of relatively independent sound source chips share a layer of conductor keys AB101 and the carbon film touch below the keys point.

(2) The carbon film contacts under the keys include relatively independent carbon film contacts AB102 in zone A, relatively independent carbon film contacts AB103 in zone C and relatively independent carbon film contacts AB104 in zone B.

(3) A switch circuit corresponding to the left channel is arranged between the carbon film contact and the sound source chip AB110 in the left channel traditional electronic keyboard instrument individual, and the carbon film contact and the sound source chip in the right channel traditional electronic keyboard instrument individual A switch circuit corresponding to the right channel is arranged between AB119. Each switch circuit includes an independent DC power supply and photocoupler groups consistent with the number of keys.

(4) The left channel switch circuit is composed of the left channel DC power supply AB107, the first optocoupler AB108, and the second optocoupler AB109. The negative pole of the input terminal of the coupler AB108 is connected to the carbon film contact AB102 in the area A under the corresponding key, the negative pole of the input end of the second optocoupler AB109 is connected to the carbon film contact AB104 in the area B under the corresponding key, and the carbon film contact AB103 in the C area Connect with the corresponding conductor keyboard AB101.

(5) The left channel switch circuit can use the conductor keyboard AB101 and the conductor glove AB105 with finger wires, and the negative lead of the left channel DC power supply AB107 is connected with the wire output terminal on the left-hand conductor glove AB105 to AB106.

(6) The right channel switch circuit includes the right channel DC power supply AB114, the first optocoupler AB116, the second optocoupler AB117, and the first optocoupler normally closed solid-state relay AB115 and the second optocoupler controlling the two optocouplers. Coupler normally closed solid state relay AB118, wherein the positive wire of the right channel DC power supply AB114 is connected to the positive input end of the first optocoupler AB116 and the second optocoupler AB117 through the output end of the second optocoupler normally closed solid state relay AB118, the first The negative pole of the input terminal of optocoupler AB116 is connected to the carbon film contact AB102 in area A under the key, the negative pole of the input end of the second optocoupler AB117 is connected to the carbon film contact AB104 in area B under the key, and the carbon film contact AB103 in area C passes through the first The positive pole and negative pole of the output end of the optocoupler normally closed solid-state relay AB115 are connected with the negative pole wire of the right channel DC power supply AB114 afterwards.

(7) The first optocoupler normally closed solid state relay AB115 and the second optocoupler normally closed solid state relay AB118 are controlled by the left channel switch circuit, the positive pole of its input terminal is connected with the positive pole wire of the left channel DC power supply AB107, and its input terminal The negative pole is connected to the carbon film contact AB103 corresponding to the area C under the keyboard.

(8) In the left channel optocoupler group, the positive pin of the output terminal of the first optocoupler AB108 is combined with the positive pin of the output terminal of the first optocoupler AB108 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the A area pin AB111 of the left channel sound source chip; The matrix keys of the keyboard instrument are regularly synthesized into a matrix, and then connected to the corresponding pins in the pin AB112 of the C area of the left channel sound source chip.

(9) In the right channel optocoupler group, the positive pin of the output terminal of the first optocoupler AB116 is combined with the positive pin of the output terminal of the first optocoupler AB116 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the A area pin AB120 in the right channel sound source chip AB119; the negative pin of the output end of the first optocoupler AB116 is connected to the negative pin of the output end of the first optocoupler AB116 in other optocoupler groups The matrix is synthesized according to the matrix button rule of the traditional electronic keyboard instrument, and then connected to the corresponding pins in the C area pins AB121 of the right channel sound source chip AB119.

(10) In the left channel optocoupler group, the positive pin of the output terminal of the second optocoupler AB109 is combined with the positive pin of the output terminal of the second optocoupler AB109 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the B area pin AB113 in the left channel sound source chip AB110; the negative pin of the output end of the second optocoupler AB109 is connected to the negative pin of the output end of the second optocoupler AB109 in other optocoupler groups The matrix is synthesized according to the matrix key rules of the traditional electronic keyboard instrument, and then connected to the corresponding pins in the C area pins AB112 of the left channel sound source chip AB110.

(11) In the right channel optocoupler group, the positive pin of the output terminal of the second optocoupler AB117 is combined with the positive pin of the output terminal of the second optocoupler AB117 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the B zone pins AB122 in the right channel sound source chip AB119; The matrix is synthesized according to the matrix button rule of the traditional electronic keyboard instrument, and then connected to the corresponding pins in the C area pins AB121 of the right channel sound source chip AB119.

Specific implementation mode 2: the technical solution of the old AB combination switch circuit

The switch circuit includes a left channel switch circuit and a right channel switch circuit, and both the left channel switch circuit and the right channel switch circuit include an independent DC power supply and an optocoupler group consistent with the number of keys, wherein the Each of the optocoupler groups in the right channel switch circuit is controlled with the first optocoupler normally closed solid state relay and the second optocoupler normally closed solid state relay, the first optocoupler normally closed solid state relay and the second optocoupler normally closed solid state relay The two optocoupler normally closed solid state relays are controlled by the left channel switch circuit. When the left hand wearing a conductive glove hits the key, the corresponding optocoupler group in the left channel switch circuit will be activated, and at the same time, the corresponding photocoupler group in the right channel switch circuit under the same key will be closed through the corresponding optocoupler normally closed solid-state relay. Optocoupler group. In the left channel switch circuit, the optocoupler group is arranged between the positive wire of the DC power supply and the conductor keyboard, and the negative wire of the DC power supply is connected to the wire output terminal on the left channel conductor glove;

In the right channel switch circuit, after the positive wire of the DC power supply passes through the positive and negative poles of the output terminals of the second optocoupler normally closed solid state relay corresponding to each key, it is connected with each optocoupler in the optocoupler group. The positive input terminal of the optocoupler group is connected to the positive pole of the input terminal, and the negative poles of the input terminals of all optocouplers in the optocoupler group are combined together and pass through the positive and negative pins of the output terminal of the first optocoupler normally closed solid state relay, and then connected with the negative pole wire of the DC power supply connect.

In the right channel switch circuit, the positive poles of the input terminals of the first optocoupler normally closed solid state relay and the second optocoupler normally closed solid state relay are connected to the DC power supply in the left channel switch circuit The positive wires are connected, and the negative poles of the input terminals of the first optocoupler normally closed solid state relay and the second optocoupler normally closed solid state relay are directly connected to the corresponding conductor keyboard.

In the two-channel switch circuit, one pin of the output end of each optocoupler in the optocoupler group is connected to the corresponding carbon film contact wire, and the other pin is the same as that of the optocoupler at the same position in other optocoupler groups in the same circuit. The pins are matrix synthesized according to the matrix keys of traditional electronic keyboard instruments, and then connected to the corresponding pins of the relevant audio chip.

The working principle of the old AB combination switch circuit:

In the left channel switch circuit, an optocoupler group is arranged between the DC power supply and the carbon film contacts under the conductor keyboard. The left hand with finger wires plays the keys, and the optocoupler in the optocoupler group will form a current loop and be activated.

When the left hand touches the key, the optocoupler in the corresponding optocoupler group in the right channel switch circuit can be turned off through the optocoupler normally closed solid-state relay arranged in the right channel switch circuit. When the left hand does not touch the key, in the right channel switch circuit, the optocoupler in the optocoupler group corresponding to the key is in the conduction state, and the right finger without finger wire touches the key, and the carbon film contact passes through the optocoupler group The connection between the optocoupler output and the corresponding pin of the audio chip will be conducted.

Playing different keys with both hands at the same time can start the optocouplers in the corresponding optocoupler groups in the two circuits at the same time, and further conduct the carbon film contacts in area A, area C, and area B below the key being played through the output of the optocoupler. The sound source chip corresponds to the connection between the pins to play stereo with different sound sources.

Fig. 2 is a structural schematic diagram of the old AB combination switch circuit of the electronic keyboard instrument.

AB201 in the figure is a conductor keyboard. AB202 is a carbon film contact in A zone. AB203 is a carbon film contact in C area. AB204 is a carbon film contact in area B. AB205 is the left channel conductor glove. AB206 is the wire output terminal on the conductor glove. AB207 is the left channel DC power supply. AB208 is the first optocoupler for the left channel. AB209 is the second optocoupler for the left channel. AB210 is the third optocoupler for the left channel. AB211 is the left channel audio chip. AB212 is the A area pin of the left channel audio source chip. AB213 is the C area pin of the left channel audio source chip. AB214 is the pin of area B of the left channel audio source chip. AB215 is the right channel DC power supply. AB216 is the first optocoupler normally closed solid state relay. AB217 is the first optocoupler for the right channel. AB218 is the second optocoupler for the right channel. AB219 is the third optocoupler for the right channel. AB220 is the second optocoupler normally closed solid state relay. AB221 is the right channel audio chip. AB222 is the A area pin of the right channel audio source chip. AB223 is the C area pin of the right channel audio source chip. AB224 is the pin of area B of the right channel audio source chip.

In the embodiment of the old AB combination switch circuit:

(1) Two or two groups of relatively independent sound source chips are used, respectively corresponding to the left hand and right hand of playing the keyboard instrument, and the two or two groups of sound source chips share one layer of conductor keys AB201 and the carbon film contacts below the keys.

(2) The carbon film contacts under the keys are divided into relatively independent carbon film contacts AB202 in area A, relatively independent carbon film contacts AB203 in area C and relatively independent carbon film contacts AB204 in area B.

(3) Two switch circuits corresponding to the left and right sound channels are arranged between the carbon film contacts and the two sound source chips. There are optocoupler groups with the same number of keys, and each optocoupler group includes three optocouplers.

(4) In each optocoupler group of the left channel switch circuit, the positive poles of the input terminals of the first optocoupler AB208, the second optocoupler AB209, and the third optocoupler AB210 are directly connected to the positive lead wire of the left channel DC power supply AB207, The negative poles of the input terminals of these three optocouplers are connected to the conductor keyboard AB201.

(5) The left channel switch circuit can use the conductor keyboard AB201 and the conductor glove AB205 with the finger wire AB206, and the negative lead of the left channel DC power supply AB207 is connected with the wire output terminal AB206 on the left-hand conductor glove AB205.

(6) The right channel switch circuit includes a DC power supply AB215 and optocoupler groups consistent with the number of keys, each optocoupler group includes the first optocoupler AB217, the second optocoupler AB218, and the third optocoupler AB219, and the first optocoupler AB219 An optocoupler normally closed solid state relay AB216 and a second optocoupler normally closed solid state relay AB220, wherein the positive wire of the DC power supply AB215 is connected to the positive poles of the output terminals of all the second optocoupler normally closed solid state relays AB220, through which the second optocoupler normally closed The negative pole of the output terminal of the solid state relay AB220 is connected to the positive pole of the input terminal of the first optocoupler AB217, the second optocoupler AB218 and the third optocoupler AB219 in the corresponding optocoupler group, and the negative poles of the input terminals of the three optocouplers are connected to the corresponding first optocoupler. The positive pole of the output terminal of the coupled normally closed solid state relay AB216 is connected, and then the negative pole of the output terminal of the optocoupler normally closed solid state relay AB216 is further connected with the negative pole wire of the left channel DC power supply AB207. The optocoupler normally closed solid state relay can choose AQY412EH, or other components with similar functions and available ones. Two normally closed optocoupler solid state relays are controlled by the left channel switch circuit, the positive pole of the input terminal is connected to the positive pole wire of the left channel DC power supply AB207, and the negative pole of the input terminal is connected to the conductor keyboard AB201.

(7) In the left and right channel switch circuits, each optocoupler group in each switch circuit includes a first optocoupler, a second optocoupler, and a third optocoupler, and the negative pole of the output terminal of the first optocoupler is connected to The carbon film contact AB202 of the area A under the corresponding key is connected, the positive pole of the output end of the second optocoupler is connected with the carbon film contact AB203 of the area C under the corresponding key, and the negative pole of the output end of the third optocoupler is connected with the area B under the corresponding key. Carbon film contacts AB204 connection.

(8) In each optocoupler group in the left channel switch circuit, the positive pole of the output terminal of the first optocoupler AB208 and the positive pole of the output terminal of the first optocoupler AB208 in other optocoupler groups pass through the matrix keys of traditional electronic keyboard instruments Regularly carry out matrix synthesis, and then connect with the corresponding pins in the pin AB212 of the A area in the left channel audio source chip AB211; The negative output pins of the second optocoupler AB209 and the negative output pins of the second optocoupler AB209 in other optocoupler groups are combined in a matrix through the matrix keys of traditional electronic keyboard instruments, and then combined with the left channel sound source chip AB211 The corresponding pins in the pins AB213 of area C are connected; the positive pole of the output terminal of the third optocoupler AB210 is combined with the positive pole pins of the output terminal of the third optocoupler AB210 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the B area pins AB214 of the left channel sound source chip AB211.

(9) In each optocoupler group in the right channel switch circuit, the positive pole of the output terminal of the first optocoupler AB217 and the positive pole of the output terminal of the first optocoupler AB217 in other optocoupler groups pass through the matrix keys of traditional electronic keyboard instruments Carry out matrix synthesis according to the law, and then connect with the corresponding pins in the A area pin AB222 in the right channel sound source chip AB221; The negative pin of the output end is matrix-combined through the matrix key rules of traditional electronic keyboard instruments, and then connected to the corresponding pins in the C area pin AB223 of the right channel sound source chip AB221; the positive pole of the output end of the third optocoupler AB219 is connected to the In other optocoupler groups, the positive pin of the output terminal of the third optocoupler AB219 is matrix synthesized according to the matrix key rules of traditional electronic keyboard instruments, and then connected to the corresponding pins in the B area pin AB224 of the right channel sound source chip AB221 .

Specific implementation mode 3: technical solution of new CC combined single-chip microcomputer circuit

In the two-channel switch circuit corresponding to the left and right hands of playing the keyboard instrument or the multi-channel switch circuit corresponding to each finger of playing the keyboard instrument, each said switch circuit includes: a single-chip microcomputer circuit, and a keyboard The same number of optocoupler groups;

Between two or more than two single-chip microcomputer circuits, the input pin wires at the same position are combined and connected with the corresponding conductor keys in sequence; in each of the single-chip microcomputer circuits, relatively independent The optocoupler group is arranged between the output terminal and the VCC wire.

Each of the single-chip microcomputer circuits respectively leads a high and low level control line to be connected to the wire output terminal on the corresponding conductor glove;

In each of the single-chip microcomputer circuits, each of the optocoupler groups is controlled by a drive optocoupler; the positive input terminal and the positive output terminal of the drive optocoupler are connected to the VCC wire, and the drive optocoupler The negative pole of the input terminal of the coupler is connected to the output terminal of the corresponding single-chip microcomputer circuit, the negative pole of the output terminal of the driving optocoupler is arranged between the carbon film contacts of the A area and the B area under the corresponding said conductor key. optocoupler group;

Each C-zone carbon film contact under the conductor key is connected to the corresponding output terminals of all the single-chip microcomputer circuits through wires, in order to prevent the 5V signal of the VCC wire in the single-chip microcomputer circuit from passing through the positive and negative poles of the input terminals of the drive optocoupler. A circuit loop is formed between the carbon film contact end lead in the C area and the output ends of other single-chip circuits, and a directional diode is arranged between the carbon film contacts in the C area and the corresponding output ends of each of the single-chip circuits.

In the left, right channel or multi-channel switch circuit, each optocoupler group in each switch circuit includes The first optocoupler corresponding to the carbon film contact in area A of the surface and the second optocoupler corresponding to the carbon film contact in area B below the keyboard, the carbon film contacts in area A below the keyboard are respectively connected to the corresponding optocoupler groups in each switch circuit The negative pole of the input terminal of the first optocoupler is connected to the negative pole of the input terminal of the first optocoupler, and the carbon film contacts in the area B under the keyboard are respectively connected to the negative pole of the input terminal of the second optocoupler in the corresponding optocoupler group in each switch circuit.

In each channel switch circuit, the positive and negative output pins of each optocoupler in the optocoupler group are respectively connected to the same output pins of the optocouplers at the same position in other optocoupler groups of the same circuit through the matrix of traditional electronic keyboard instruments. Matrix synthesis is performed according to the key pattern, and then connected to the corresponding pins of the related audio chip.

The working principle of the new CC combination microcontroller circuit:

In the two-channel or multi-channel single-chip microcomputer switch circuit, the finger wearing the conductive glove plays the key, which is equivalent to the high and low level control line inputting a low level to the corresponding input terminal of the programmed single-chip microcomputer circuit through the conductive keyboard, which is the same as When the matched single-chip microcomputer circuit detects the input signal, it will control the corresponding output terminal to output a low level.

The 5V signal on the VCC wire first drives the optocoupler's input and output terminals and then connects with the output end of the microcontroller circuit to form a current loop to start driving the optocoupler. After the drive optocoupler starts, the 5V signal on the VCC wire passes through the drive optocoupler. The positive and negative pins of the output terminal of the first optocoupler and the positive input terminal of the second optocoupler are connected, and then the 5V signal is transmitted to the carbon film contact in the A area connected to it through the negative pole of the input terminal of the first optocoupler , through the negative input terminal of the second optocoupler, the 5V signal is transmitted to the carbon film contact of area B connected to it, and the key is played. Under the action of the conductive rubber, the carbon film contacts of area A and C and area B , The carbon film contacts in area C are turned on successively, and the 5V signal from the VCC wire will be transmitted to the carbon film contacts in area C, and the carbon film contacts in area C with 5V signals will pass through a diode and the corresponding output end of the microcontroller circuit Connect, and form a current loop with the low-level signal at the output end to further activate the first optocoupler and the second optocoupler successively, and then the pin wires corresponding to the audio source chips connected to the output ends of the first optocoupler and the second optocoupler are also It will be turned on successively, start the circuit inside the sound source chip, and playback the sampled sound.

Select the switch circuit combined with the single-chip microcomputer circuit and the optocoupler group, as well as the application of the directional diode, without the need for the reverse current direction of the DC power supply, and without the application of the optocoupler normally closed solid-state relay, which can avoid two or two corresponding to the same key. The above optocoupler groups form a current loop when different high and low level control lines touch the key.

Each single-chip microcomputer needs to be programmed, and communication needs to be established between the single-chip microcomputer and the single-chip microcomputer to realize that multiple control lines share the same set of input IO ports without affecting each other. The application of single-chip microcomputer circuit on electronic keyboard musical instruments, taking the six-channel 61-key electronic piano as an example: it is realized by six groups of single-chip microcomputer circuits, each group of single-chip microcomputer circuits includes 61 input terminals and 61 output terminals corresponding to the keys and a common point , when the common point touches one or several input terminals to form a current loop signal, this group of signals is collected by the microcontroller and output in this group;

Take one group as an example: it mainly uses the high-speed polling control mode of the IO pin of the single-chip microcomputer, and can complete the corresponding operation within a dozen microseconds. ping, then pass 8 pieces of 74HC245 respectively read 61 input signals, store the read results in the register, and then output the read signals through 8 pieces of 74HC573. If the input signal changes, the optocoupler connected to the output terminal will also It will change accordingly. When the instruction received by the single-chip microcomputer is not in line with its own instructions, the single-chip computer will set the common point to high level, and this group of circuits will stop working. The same principle applies to other groups.

The principle of the first group of single-chip microcomputer circuits is: it will actively issue instructions to control the working status of the six single-chip microcomputers, and the instructions will be changed after a period of time, so that all single-chip microcomputers work in turn, so that 61 by 6 groups of signals are collected in this group. , but the outputs do not interfere with each other.

Fig. 3 is a block schematic diagram of the circuit structure of the new CC combined single-chip microcomputer of the electronic keyboard instrument.

CC101 in the figure is a conductor keyboard. CC102 is a carbon film contact in A zone. CC103 is a carbon film contact in the C area. CC104 is the carbon film contact of B area. CC105 is a conductor glove. CC106 is the wire output terminal on the conductor glove. CC107 is a microcontroller circuit. CC108 is the input terminal of the single-chip microcomputer circuit. CC109 is the output terminal of the single-chip microcomputer circuit. CC110 is the high and low level control line drawn from the microcontroller circuit. CC111 is the VCC wire drawn from the microcontroller circuit. CC112 is the driver optocoupler. CC113 is the first optocoupler. CC114 is the second optocoupler. CC115 is a diode connected to the carbon film contact of C area. CC116 is a sound source chip. CC117 is the A area pin of the audio chip. CC118 is the C area pin of the audio chip. CC119 is the pin of area B of the audio chip.

In the implementation of the new CC combined microcontroller circuit:

(1) Apply two or more sound source chips, respectively corresponding to the left hand, right hand or each finger of playing the keyboard instrument, and all the sound source chips share a layer of conductor key CC101 and the carbon film contact under the key.

(2) In the electronic keyboard instrument with dual velocity sensing structure, the carbon film contacts under the keys are divided into relatively independent carbon film contacts CC102 in area A, relatively independent carbon film contacts CC103 in area C and relatively independent carbon film contacts in area B. Membrane contacts CC104.

(3) A switch circuit is arranged between the carbon film contacts below the keys and the sound source chip CC106 corresponding to the left and right hands of the keyboard instrument or the different fingers of the keyboard instrument. The switch circuit includes a single-chip microcomputer circuit CC107 and is consistent with the number of keys optocoupler group.

(4) In two or more than two single-chip microcomputer circuits CC107, the input terminals CC108 at the same position are combined together and connected to the corresponding conductor key CC101 through wires. (For example: the first input terminals of different single-chip microcomputer circuits are combined together and connected with the first conductor key; the second input terminals of different single-chip microcomputer circuits are combined together and connected with the second conductor key...)

(5) In the single-tone double-keyboard velocity sensing structure, each optocoupler group of the new CC combination switch circuit includes three optocouplers. We call the first optocoupler the driving optocoupler CC112, and the second optocoupler as CC112. It is the first optocoupler CC113, and the third optocoupler is called the second optocoupler CC114. The driving optocoupler CC112 will provide a VCC signal to the input terminals of the first optocoupler CC113 and the second optocoupler CC114 when it is turned on.

(6) In each switch circuit, the positive input terminal and the positive output terminal of the driving optocoupler CC112 are connected to the VCC terminal wire CC111 in the single-chip microcomputer circuit CC107, and the negative input terminal of the driving optocoupler CC112 is connected to the corresponding output terminal of the single-chip microcomputer circuit CC107 CC109 is connected, and the negative pole of the output end of the driving optocoupler CC112 is connected to the positive pole of the input end of the first optocoupler CC113 and the second optocoupler CC114.

(7) The negative pole of the input end of the first optocoupler CC113 in the optocoupler group is connected to the carbon film contact CC102 in area A under the corresponding key, and the negative pole of the input end of the second optocoupler CC114 is connected to the carbon film in area B under the corresponding key. Contact CC104 is connected.

(8) In all optocoupler groups, the positive pin of the output terminal of the first optocoupler CC113 is combined with the positive pin of the output terminal of the first optocoupler CC113 in other optocoupler groups in the same circuit through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins of the pins CC117 in the A area of the related sound source chip CC116; Matrix synthesis is performed through the matrix keys of traditional electronic keyboard instruments, and then connected to the corresponding pins in the C area pin CC118 of the relevant sound source chip CC116;

In all optocoupler groups, the output positive pin of the second optocoupler CC114 and the output positive pins of the second optocoupler CC114 in other optocoupler groups in the same circuit are synthesized in a matrix, and then connected to the B area of the related sound source chip CC116. The corresponding pins in the pin CC119 are connected; the negative pins of the output end of the second optocoupler CC114 and the negative pins of the output end of the second optocoupler CC114 in other optocoupler groups in the same circuit are synthesized in a matrix, and then connected to the C area of the related sound source chip. Corresponding pin connection in pin CC118.

(9) A directional diode CC115 needs to be arranged between the carbon film contact CC103 in the area C under the key and the corresponding output end CC109 of each single-chip microcomputer circuit CC107.

(10) Playing a stereo electronic keyboard instrument can use a conductor glove CC105 with a finger wire CC106 and a conductor finger end, and each single-chip circuit is connected with the corresponding wire output terminal CC106 on the conductor glove CC105 by a high and low level control line CC110.

(11) A two-channel stereo electronic keyboard instrument requires two relatively independent traditional electronic keyboard instruments and two single-chip microcomputer circuits. Connection, the carbon film contacts under the keys are connected to two sound source chips through two single-chip circuits, which can realize left and right two-channel stereo.

(12) A six-channel stereo electronic keyboard instrument requires six relatively independent traditional electronic keyboard instruments and six single-chip microcomputer circuits. The six single-chip microcomputer circuits lead six control lines to connect with the wire output terminals on the conductor gloves of both hands. The thumb finger wires on the conductor glove respectively correspond to a single-chip microcomputer circuit, the finger wires of the index finger and the middle finger on the left and right hand conductor gloves respectively correspond to a single-chip microcomputer circuit, the ring finger and the middle finger on the left and right hand conductor gloves The finger wires of the little finger correspond to a single-chip microcomputer circuit, and the carbon film contacts under the keys are connected to six sound source chips through six single-chip microcomputer circuits, which can realize six-channel stereo.

(13) The ten-channel stereo electronic keyboard instrument needs ten relatively independent traditional electronic keyboard instruments and ten single-chip microcomputer circuits, and ten single-chip microcomputer circuits lead ten control lines to connect with the wire output terminals on the two-hand conductor gloves. Each finger wire on the right-hand conductor glove corresponds to a single-chip microcomputer circuit, and the carbon film contacts under the keys are connected with ten sound source chips through ten single-chip microcomputer circuits, which can realize ten-channel stereophonic sound.

(14) The single-chip microcomputer circuit is composed of a single-chip microcomputer and an expansion chip, and the 61-key electronic organ needs 61 input IO ports and 61 output IO ports of the single-chip microcomputer circuit.

(15) Choose P281 SMD optocoupler for the optocoupler, choose 51 single-chip microcomputer for the single-chip microcomputer, or choose other available models of the same kind.

(16) After further development of the product, multiple traditional electronic keyboard instruments that make up the stereo electronic keyboard instrument are expected to form an integrated structure. Firstly, it includes multiple circuit boards, and secondly, multiple circuit boards are further combined.

Specific implementation mode 4: The technical solution of the old CC combined single-chip microcomputer circuit

In the two-channel switch circuit corresponding to the left and right hands of playing a keyboard instrument or the multi-channel switch circuit corresponding to each finger of playing a keyboard instrument, each said switch circuit includes a single-chip microcomputer circuit and is consistent with the number of keys The optocoupler group; between two or more than two single-chip microcomputer circuits, the input pin wires at the same position are combined together, and connected with the corresponding conductor keys in sequence;

In each of the single-chip microcomputer circuits, an optocoupler group is arranged between the relatively independent output terminal and the VCC wire;

Each of the single-chip microcomputer circuits needs to draw a high and low level control line to be connected to the wire output on the conductor glove; The positive input terminal of each optocoupler in the group is connected to the positive pole, and the negative pole of the input terminal of each optocoupler in the optocoupler group is connected to the corresponding output terminal of the single-chip microcomputer circuit.

In a two-channel or multi-channel switch circuit, one pin of each optocoupler output terminal in the optocoupler group is connected to the corresponding carbon film contact wire, and the other pin is connected to the same position in other optocoupler groups in the same circuit. The same pins of the optocoupler are matrix synthesized through the matrix keys of traditional electronic keyboard instruments, and then connected to the corresponding pins of the related audio chip.

The working principle of the old CC combination microcontroller circuit:

In each switch circuit, the VCC wire is connected to the positive poles of the input terminals of the optocouplers in all optocoupler groups, and the negative pole of the input terminals of the optocouplers in each optocoupler group is connected to the corresponding output terminal of the single-chip microcomputer circuit.

Combination of two or more single-chip microcomputer circuits, the left, right hand or each finger presses different keys at the same time, it will start the optocoupler in the optocoupler group corresponding to the key in the relevant single-chip microcomputer circuit, and further pass through the optocoupler group. The output end of the optocoupler conducts the connection between the carbon film contacts of different partitions and the corresponding pins of the audio source chip to realize two-channel or multi-channel stereo.

Select the switch circuit combined with the single-chip microcomputer circuit and the optocoupler group, without the need for the reverse direction of the DC power supply current, and without the application of the optocoupler normally closed solid-state relay, which can prevent two or more optocoupler groups corresponding to the same key from operating at different levels. The level control line forms a current loop when a key is touched.

Fig. 4 is a schematic block diagram of the circuit structure of the old CC combination microcontroller of the electronic keyboard instrument.

CC201 in the figure is a conductor keyboard. CC202 is a carbon film contact in zone A. CC203 is a carbon film contact in C area. CC204 is a carbon film contact in area B. CC205 is a conductor glove. CC206 is the wire output terminal on the conductor glove. CC207 is a microcontroller circuit. CC208 is the input terminal of the single-chip microcomputer circuit. CC209 is the output terminal of the single-chip microcomputer circuit. CC210 is the high and low level control line drawn from the microcontroller circuit. CC211 is the VCC lead from the microcontroller circuit. CC212 is the first optocoupler. CC213 is the second optocoupler. CC214 is the third optocoupler. CC215 is the audio chip. CC216 is the A area pin of the audio chip. CC217 is the C area pin of the audio chip. CC218 is the pin of area B of the audio chip.

In the implementation of the old CC combined microcontroller circuit:

(1) Apply two or more sound source chips, respectively corresponding to the left hand, right hand or each finger of playing the keyboard instrument, and all the sound source chips share a layer of conductor key CC201 and the carbon film contact under the key.

(2) The carbon film contacts under the keys are divided into relatively independent carbon film contacts CC202 in area A, relatively independent carbon film contacts CC203 in area C and relatively independent carbon film contacts CC204 in area B.

(3) A switch circuit is arranged between the carbon film contacts below the keys and the sound source chip CC215 corresponding to the left and right hands of the keyboard instrument or the different fingers of the keyboard instrument. Optocoupler group composition.

(4) In two or more single-chip microcomputer circuits CC207, the input terminals CC208 at the same position are combined together and connected to the corresponding conductor keyboard CC201 through wires.

(5) In the switching circuit of the single-timbre double-keyboard velocity sensing structure, the optocouplers in each optocoupler group include the first optocoupler CC212, the second optocoupler CC213 and the third optocoupler CC214, and the VCC terminal of the single-chip microcomputer circuit CC207 The wire CC211 is connected to the positive poles of the input terminals of the three optocouplers in the optocoupler group, and the negative poles of the input terminals of the three optocouplers are connected to the corresponding output terminal CC209 of the single-chip microcomputer circuit CC207. In each optocoupler group, the negative pole of the output end of the first optocoupler CC212 is connected to the carbon film contact CC202 in the area A under the corresponding key, and the positive pole of the output end of the second optocoupler CC213 is connected to the carbon film contact CC203 in the area C under the corresponding key. The negative pole of the output end of the third optocoupler CC214 is connected to the carbon film contact CC204 in the area B under the corresponding key.

(6) In each optocoupler group of each switch circuit, the positive pole of the output terminal of the first optocoupler CC212 and the positive pole of the output terminal of the first optocoupler CC212 in other optocoupler groups of the same circuit pass through the matrix keys of traditional electronic keyboard instruments Carry out matrix synthesis regularly, and then connect with the corresponding pins in the A area pin CC216 in the relevant sound source chip CC215; The negative pin of the output end is matrix synthesized through the matrix keys of traditional electronic keyboard instruments, and then connected to the corresponding pin in the C area pin CC217 of the relevant sound source chip CC215; the positive pole of the output end of the third optocoupler CC214 is connected to the same circuit The positive pin of the output terminal of the third optocoupler CC214 in other optocoupler groups performs matrix synthesis through the matrix keys of traditional electronic keyboard instruments, and then connects with the corresponding pins in the B area pins CC218 of the related sound source chip CC215.

(7) The conductor glove CC205 with finger lead and conductor finger end will be used to play the stereo electronic keyboard instrument, and each single-chip microcomputer circuit CC207 needs to draw a high and low level control line CC210 to be connected with the wire output terminal on the conductor glove CC205.

(8) A two-channel stereo electronic keyboard instrument requires two relatively independent traditional electronic keyboard instruments and two single-chip microcomputer circuits. The two single-chip microcomputer circuits lead to two control lines, which are output one-to-one with the conductors on the hands-on gloves. The carbon film contacts under the keys are connected to the two sound source chips through two single-chip microcomputer circuits, which can realize left and right two-channel stereo.

(9) Six-channel stereo electronic keyboard instrument requires six relatively independent traditional electronic keyboard instruments and six single-chip microcomputer circuits. The thumb finger wires on the conductor glove correspond to a single-chip microcomputer circuit respectively, the finger wires of the index finger and the middle finger on the left and right hand conductor gloves respectively correspond to a single-chip microcomputer circuit, and the ring finger and the finger wires of the little finger on the left and right hand conductor gloves are combined respectively. Corresponding to a single-chip microcomputer circuit, the carbon film contacts under the keys are connected to six sound source chips through six single-chip microcomputer circuits, which can realize six-channel stereo sound.

(10) The ten-channel stereo electronic keyboard instrument requires ten relatively independent traditional electronic keyboard instruments and ten single-chip microcomputer circuits, and ten single-chip microcomputer circuits lead ten control lines to be connected with the wire output terminals on the two-hand conductor gloves. Each finger wire on the right-hand conductor glove corresponds to a single-chip microcomputer circuit, and the carbon film contacts under the keys are connected with ten sound source chips through ten single-chip microcomputer circuits, which can realize ten-channel stereophonic sound.

Specific implementation mode 5: technical solution of new BB combination switch circuit

The switch circuit includes a left channel switch circuit and a right channel switch circuit; both the left channel switch circuit and the right channel switch circuit include an independent DC power supply and an optocoupler group consistent with the number of keys; The current directions of the left channel switch circuit and the right channel switch circuit are opposite. The left channel switch circuit is arranged with the optocoupler group between the positive wire of its DC power supply and the carbon film contacts of the A zone and B zone below each of the conductor keys. The negative lead wire of the left channel is connected to the lead output end on the conductor glove of the left channel; the switch circuit of the right channel is between the negative lead lead of another DC power supply and the carbon film contacts of the A zone and the B zone below each of the conductor keys The optocoupler group is arranged between them, and the positive wire of the DC power supply is connected to the wire output terminal on the right channel conductor glove; the carbon film contacts in the C area below the keys are connected to the corresponding conductor keyboard.

In the left and right channel switch circuits, each optocoupler group in each switch circuit includes the first optocoupler corresponding to the carbon film contacts of the A area and C area under the keyboard and the first optocoupler corresponding to the B area and C area below the keyboard. The second optocoupler corresponding to the carbon film contact,

The carbon film contacts in area A under the keyboard are respectively connected to the negative input terminal of the first optocoupler in the corresponding optocoupler group in each switch circuit, and the carbon film contacts in area B under the keyboard are respectively connected to the corresponding optocoupler in each switch circuit. The negative input terminal of the second optocoupler in the group is connected,

The working principle of the new BB combination switch circuit:

In the switch circuit of the left and right channels, the left hand wearing the conductor glove plays the key, and the optocoupler in the optocoupler group between the DC power supply of the left channel and the carbon film contact under the corresponding conductor keyboard forms a current loop. Start, the right hand wearing a conductor glove plays the keys, the optocoupler in the optocoupler group between the right channel DC power supply and the carbon film contact under the corresponding conductor keyboard forms a current loop and is activated, and the fingers of both hands play different keys at the same time. The two switch circuits work at the same time, and the optocouplers in the corresponding optocoupler groups in the two circuits can be started at the same time, and the corresponding pins of the related sound source chips connected by wires at both ends of the output of each optocoupler will be activated. Conduction, you can play two-channel stereo.

The current directions of the two switching circuits are opposite, and when both hands touch the keys at the same time, the finger wires will not form a current loop between the left and right channel optocoupler groups under the same key.

Fig. 5 is a schematic structural diagram of the new BB combination switch circuit of the electronic keyboard instrument.

BB101 in the figure is a conductor keyboard. BB102 is a carbon film contact in zone A. BB103 is a carbon film contact in C area. BB104 is a carbon film contact in area B. BB105 is the left channel conductor glove. BB106 is the wire output terminal on the conductor glove. BB107 is the left channel DC power supply. BB108 is the first optocoupler for the left channel. BB109 is the second optocoupler for the left channel. BB110 is the left channel audio chip. BB111 is the pin of area A of the left channel audio source chip. BB112 is the C area pin of the left channel audio source chip. BB113 is the pin of area B of the left channel audio source chip. BB114 is the right channel conductor glove. BB115 is a finger wire on a conductor glove. BB116 is the right channel DC power supply. BB117 is the first optocoupler for the right channel. BB118 is the second optocoupler for the right channel. BB119 is the right channel audio chip. BB120 is the A pin of the right channel audio source chip. BB121 is the C area pin of the right channel audio source chip. BB122 is the pin of area B of the right channel audio source chip.

In the embodiment of this new BB combination switch circuit:

(1) Apply two or two groups of relatively independent sound source chips, respectively corresponding to the left and right hands of playing keyboard instruments, and two or two groups of relatively independent sound source chips share a layer of conductor keys BB101 and carbon film touch pads under the keys. point.

(2) The carbon film contacts under the keys are divided into relatively independent carbon film contacts BB102 in area A, relatively independent carbon film contacts BB103 in area C and relatively independent carbon film contacts BB104 in area B.

(3) Two sets of switch circuits corresponding to the left and right channels are arranged between the carbon film contacts and the two sound source chips. The group includes two optocouplers corresponding to the carbon film contact BB102 in the A region and the carbon film contact BB104 in the B region, which are referred to as the first optocoupler and the second optocoupler.

(4) The positive wire of the DC power supply BB107 of the left channel switch circuit is connected to the positive poles of the input terminals of the first optocoupler BB108 and the second optocoupler BB109, and the negative pole of the input terminal of the first optocoupler BB108 is in contact with the corresponding carbon film in area A. Point BB102 is connected, and the negative pole of the input terminal of the second optocoupler BB109 is connected to the corresponding carbon film contact BB104 in the B area;

(5) The negative lead wire of the DC power supply BB116 of the right channel switch circuit is connected to the negative poles of the input terminals of the first optocoupler BB117 and the second optocoupler BB118, and the positive pole of the input terminal of the first optocoupler BB117 is in contact with the carbon film of the corresponding area A. The point BB102 is connected, and the anode of the input end of the second optocoupler BB118 is connected to the corresponding carbon film contact BB104 in the B area.

(6) In the left channel optocoupler group, the positive pin of the output terminal of the first optocoupler BB108 is combined with the positive pin of the output terminal of the first optocoupler BB108 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the A area pin BB111 in the left channel sound source chip BB110; Matrix synthesis is performed through the matrix keys of traditional electronic keyboard instruments, and then connected to the corresponding pins in the C area pin BB112 of the left channel sound source chip BB110;

(7) In the right channel optocoupler group, the positive pin of the output terminal of the first optocoupler BB117 is combined with the positive pin of the output terminal of the first optocoupler BB117 in other optocoupler groups through matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins of the pins BB120 in the A area of the right channel sound source chip BB119; Matrix synthesis is carried out through the matrix keys of traditional electronic keyboard instruments, and then connected to the corresponding pins in the C area pin BB121 of the right channel sound source chip BB119;

(8) In the left channel optocoupler group, the positive pin of the output terminal of the second optocoupler BB109 is combined with the positive pin of the output terminal of the second optocoupler BB109 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the B area pin BB113 in the left channel sound source chip BB110; the negative pin of the output end of the second optocoupler BB109 is connected to the negative pin of the output end of the second optocoupler BB109 in other optocoupler groups Matrix synthesis is performed according to the matrix key rules of traditional electronic keyboard instruments, and then combined with the pin BB112 in the C area of the left channel sound source chip BB110 Corresponding pin connections in .

(9) In the right channel optocoupler group, the positive pin of the output terminal of the second optocoupler BB118 is combined with the positive pin of the output terminal of the second optocoupler BB118 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the B area pin BB122 in the right channel sound source chip BB119; the output negative pin of the second optocoupler BB118 is connected to the output negative pin of the second optocoupler BB118 in other optocoupler groups The matrix is synthesized according to the matrix key rules of the traditional electronic keyboard instrument, and then connected to the corresponding pins in the C area pin BB121 of the right channel sound source chip BB119.

(10) The conductor keyboard BB101 is connected to the corresponding carbon film contact BB103 in the C area.

(11) Finger wires are respectively arranged on the left channel conductor glove BB105 and the right channel conductor glove BB114, the wire output terminal BB106 on the left hand glove is connected with the negative pole of the left channel DC power supply BB107, and the wire output terminal BB115 on the right hand glove Connect to the positive pole of the right channel DC power supply BB116.

Specific implementation mode 6: technical solution of the old BB combination switch circuit

The switch circuit includes a left channel switch circuit and a right channel switch circuit, both of the left channel switch circuit and the right channel switch circuit include an independent DC power supply and an optocoupler group consistent with the number of keys, the The two circuits of the left channel switch circuit and the right channel switch circuit have opposite current directions.

Said left channel switch circuit is arranged with said optocoupler group between the positive wire of its DC power supply and each said conductor key, and the negative wire of the DC power supply is connected to the wire output terminal on the left channel conductor glove; The right channel switch circuit is arranged with the optocoupler group between the negative wire of another DC power supply and each of the conductor keys, and the positive wire of the DC power supply is connected to the wire output terminal on the right channel conductor glove .

The working principle of the old BB combination switch circuit:

In the switch circuit of the left and right channels, the left hand wearing the conductor glove plays the key, and the optocoupler in the optocoupler group between the left channel DC power supply and the corresponding conductor keyboard forms a current loop and is activated. The right hand plays the key, the photocoupler in the optocoupler group between the right channel DC power supply and the corresponding conductor keyboard forms a current loop and is activated, and the fingers of both hands play different keys at the same time, which can simultaneously activate the corresponding in the two switch circuits. The optocoupler in the optocoupler group further conducts the connection between the carbon film contact and the corresponding pin of the related sound source chip through the output end of the optocoupler, and will play stereo sounds with different sound sources.

Fig. 6 is a schematic structural diagram of the old BB combination switch circuit of the electronic keyboard instrument.

BB201 in the figure is a conductor keyboard. BB202 is a carbon film contact in zone A. BB203 is a carbon film contact in C area. BB204 is a carbon film contact in area B. BB205 is the left channel conductor glove. BB206 is the wire output terminal on the conductor glove. BB207 is the left channel DC power supply. BB208 is the first optocoupler for the left channel. BB209 is the second optocoupler for the left channel. BB210 is the third optocoupler for the left channel. BB211 is the left channel audio chip. BB212 is the pin of area A of the left channel audio source chip. BB213 is the C area pin of the left channel audio source chip. BB214 is the pin of area B of the left channel audio source chip. BB215 is the right channel conductor glove. BB216 is the wire output terminal on the conductor glove. BB217 is the right channel DC power supply. BB218 is the first optocoupler for the right channel. BB219 is the second optocoupler for the right channel. BB220 is the third optocoupler for the right channel. BB221 is the right channel audio chip. BB222 is the A pin of the right channel audio source chip. BB223 is the C area pin of the right channel audio source chip. BB224 is the pin of area B of the right channel audio source chip.

In the embodiment of the old BB combination switch circuit:

(1) Two or two groups of relatively independent sound source chips are used, respectively corresponding to the left and right hands of playing keyboard instruments, and the two or two groups of relatively independent sound source chips share a layer of conductor keys BB201 and the carbon below the keys. Membrane contacts.

(2) The carbon film contacts under the keys are divided into relatively independent carbon film contacts BB202 in area A, relatively independent carbon film contacts BB203 in area C and relatively independent carbon film contacts BB204 in area B.

(3) Two sets of switch circuits corresponding to the left and right sound channels are arranged between the carbon film contacts and the two sound source chips, each set of switch circuits includes a relatively independent DC power supply and optocoupler groups consistent with the number of keys.

(4) In the single-tone dual-force-sensitive button mode, the optocoupler group includes the first optocoupler, the second optocoupler and the third optocoupler.

(5) The positive wire of the DC power supply BB207 of the left channel switch circuit is connected to the positive poles of the input terminals of all optocouplers in the optocoupler group, and the negative poles of the input terminals of all optocouplers in the optocoupler group are connected to the corresponding conductor keyboard BB201; The negative wire of the DC power supply BB217 of the channel switch circuit is connected to the negative pole of the input terminal of the optocouplers in the optocoupler group, and the positive poles of the input terminals of all the optocouplers in the optocoupler group are connected to the corresponding conductor keyboard BB201.

(6) In the left and right channel switch circuits, the negative poles of the output terminals of the first optocoupler in all optocoupler groups are connected to the corresponding carbon film contact BB202 in area A under the keyboard, and the positive poles of the output terminals of the second optocoupler are connected to the corresponding The carbon film contact BB203 in area C under the keyboard is connected, and the negative output terminal of the third optocoupler is connected to the corresponding carbon film contact BB204 in area B under the keyboard.

(7) In each optocoupler group of the left channel switch circuit, the positive pole of the output terminal of the first optocoupler BB208 and the positive pole of the output terminal of the first optocoupler BB208 in other optocoupler groups pass through the matrix key rule of the traditional electronic keyboard instrument Carry out synthesis, then be connected with the corresponding pin in the A area pin BB212 in the left channel sound source chip BB211; The output negative pin goes through The matrix button rule of the traditional electronic keyboard instrument is used for matrix synthesis, and then connected to the corresponding pins in the C area pin BB213 in the left channel sound source chip BB211; The positive pin of the output terminal of the third optocoupler BB210 is combined in a matrix through the matrix keys of traditional electronic keyboard instruments, and then connected to the corresponding pins in the B area pins BB214 of the left channel sound source chip BB211.

(8) In each optocoupler group of the right channel switch circuit, the positive pole of the output terminal of the first optocoupler BB218 and the positive pole of the output terminal of the first optocoupler BB218 in other optocoupler groups pass through the matrix key rule of the traditional electronic keyboard instrument Carry out synthesis, then be connected with the corresponding pin in the A zone pin BB222 in the right channel sound source chip BB221; The negative pole pin of the output terminal carries out matrix synthesis through the matrix button rule of the traditional electronic keyboard instrument, and then is connected with the corresponding pin in the C area pin BB223 in the right channel sound source chip BB221; The output terminal of the third optocoupler BB220 is positive Pole and the positive pin of the output terminal of the third optocoupler BB220 in the other optocoupler groups are combined in a matrix through the matrix key rules of traditional electronic keyboard instruments, and then combined with the corresponding pins in the B area pin BB224 of the right channel sound source chip BB221 pin connection.

(9) Finger wires are arranged on the conductor glove, the wire output terminal BB206 on the left-hand conductor glove BB205 is connected to the negative pole of the left channel DC power supply BB207, and the wire output terminal BB216 on the right-hand conductor glove BB215 is connected to the negative pole of the right channel DC power supply BB217 Positive connection.

Specific implementation mode 7: technical scheme of AA combination switch circuit keyboard partition fixed structure

An electronic keyboard musical instrument, including the keys, the carbon film contacts under them, and the sound source chip on the main board. The left and right hands for playing keyboard instruments correspond to one or a group of relatively independent sound source chips; There is a switch circuit for the left channel between them; a switch circuit for the right channel is arranged between the carbon film contacts under the keys in the right keyboard area and the sound source chip corresponding to the right hand;

The non-public carbon film contacts in area A and area B under the keyboard are relatively independent, and all the public carbon film contacts in area C under the keyboard are combined together and connected to the negative lead of the DC power supply;

The left channel switch circuit and the right channel switch circuit include: a common DC power supply, and an optocoupler group consistent with the number of keys in the corresponding partition;

In the left channel switch circuit, a left channel optocoupler group is arranged between the positive wire of the DC power supply and the relatively independent carbon film contacts of the A zone and the B zone under each key of the left keyboard area;

In the right channel switch circuit, a right channel optocoupler group is arranged between the positive wire of the DC power supply and the relatively independent carbon film contacts of the A zone and the B zone under each key of the right keyboard area;

In the left and right channel switch circuits, each optocoupler group in each switch circuit includes the first optocoupler corresponding to the carbon film contacts of the A area and C area under the keyboard and the first optocoupler corresponding to the B area and C area below the keyboard. The second optocoupler corresponding to the carbon film contact;

The carbon film contacts in area A under the keyboard are respectively connected to the negative input terminal of the first optocoupler in the corresponding optocoupler group in each switch circuit, and the carbon film contacts in area B under the keyboard are respectively connected to the corresponding optocoupler in each switch circuit. The negative input terminal of the second optocoupler in the group is connected;

In each channel switch circuit, the positive and negative pins of the output terminals of each optocoupler in the optocoupler group are respectively connected to the same output pins of the optocouplers at the same position in other optocoupler groups of the same circuit through the matrix of traditional electronic keyboard instruments. The matrix keys are synthesized regularly, and then connected to the corresponding pins of the related audio chip. The left or right hand playing the keyboard instrument plays the keys in the corresponding area, and the conductive rubber covers the carbon film contacts, which can realize the control of the corresponding optocoupler group in the related switch circuit, and further realize the control of the corresponding pins of the related sound source chip.

AA combination switch circuit keyboard partition fixed structure circuit working principle:

The positive wire of the DC power supply will be connected to the corresponding carbon film contact in area A under the keyboard through the first optocoupler input terminal of each optocoupler group connected to it, and will also be connected to the corresponding carbon film contact through the second optocoupler input terminal. The carbon film contacts in area B under the keyboard are connected. When the key is pressed, the positive charges on the carbon film contacts in area A and carbon film contacts in area B will be transferred to the carbon film contacts in area C through conductive rubber, and the carbon film contacts in area C will be transferred to the carbon film contacts in area C. The film contact is connected with the negative wire of the DC power supply to form a current loop, and the corresponding first optocoupler and the second optocoupler under the keyboard are activated successively, because the output end of the first optocoupler and the second optocoupler are connected to the corresponding audio source chip through the wire. The pins are connected, so the corresponding pins of the related sound source chips connected to it will be further conducted, and the fingers of both hands play the keys in their respective keyboard areas, which can realize the left channel pronunciation when the left hand touches the keys, and the right channel pronunciation when the right hand touches the keys.

Fig. 7 is a schematic diagram of the partition fixing structure of the AA combination switch circuit of the electronic keyboard musical instrument.

In the figure, AA101 is the carbon film contact in area A. AA102 is the carbon film contact of C area. AA103 is the carbon film contact of the B area. AA104 is a DC power supply. AA105 is the first optocoupler for the left channel. AA106 is the second optocoupler for the left channel. AA107 is the left channel audio chip. AA108 is the A area pin of the left channel audio source chip. AA109 is the C area pin of the left channel audio source chip. AA110 is the pin of area B of the left channel audio source chip. AA111 is the first optocoupler for the right channel. AA112 is the second optocoupler for the right channel. AA113 is the right channel audio chip. AA114 is the A area pin of the right channel audio source chip. AA115 is the C area pin of the right channel audio source chip. AA116 is the pin of area B of the right channel audio source chip.

In the embodiment of the AA combination switch circuit keyboard partition fixed structure:

(1) Apply two or two groups of relatively independent sound source chips, corresponding to the left and right hands of playing keyboard instruments respectively, divide the single-layer keyboard or two-layer keyboard of playing keyboard instruments into two groups, each group of keyboards and the carbon film below them The contacts correspond to one or a group of sound source chips.

(2) The carbon film contacts under the keys are divided into A-area carbon film contacts AA101, C-area carbon film contacts AA102 and B-area carbon film contacts AA103, in which the A-area carbon film contacts AA101 and The carbon film contact AA103 in area B is relatively independent, and all the carbon film contacts AA102 in area C under each group of keyboards are combined together, and the direct channel shared with the left and right audio channels Connect the negative lead of the DC power supply AA104.

(3) A switch circuit is arranged between the carbon film contacts and each of the sound source chips. Each group of switch circuits includes a DC power supply AA104 and optocoupler groups consistent with the number of partitioned keys.

(4) In the mode of single-tone dual-velocity sensing, each optocoupler group includes two optocouplers corresponding to the carbon film contact AA101 in area A and the carbon film contact AA103 in area B, which are called the first optocoupler and the second optocoupler. optocoupler. The positive poles of the input terminals of the two optocouplers are connected to the positive wire of the DC power supply AA104, and the negative poles of the two optocoupler input terminals are respectively connected one-to-one with the relatively independent carbon film contacts AA101 and B carbon film contacts under the corresponding keyboard. AA103 connection.

(5) In the optocoupler group of the left channel, the positive pin of the output terminal of the first optocoupler AA105 and the positive pin of the output terminal of the first optocoupler AA105 in other optocoupler groups are combined in a matrix through the matrix keys of traditional electronic keyboard instruments , and then connected to the corresponding pins in the A area pins AA108 in the left channel sound source chip AA107; the output negative pins of the first optocoupler AA105 are connected with the output negative pins of the first optocoupler AA105 in other optocoupler groups The matrix is synthesized according to the matrix key rules of the traditional electronic keyboard instrument, and then connected to the corresponding pins in the C area pin AA109 of the left channel sound source chip AA107.

(6) In the right channel optocoupler group, the positive pin of the output terminal of the first optocoupler AA111 is combined with the positive pin of the output terminal of the first optocoupler AA111 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the A area pin AA114 in the right channel sound source chip AA113; the negative pin of the output end of the first optocoupler AA111 is connected to the negative pin of the output end of the first optocoupler AA111 in other optocoupler groups Matrix synthesis is carried out through the matrix keys of traditional electronic keyboard instruments, and then connected to the corresponding pins in the pins AA115 of the C area in the right channel sound source chip AA113.

(7) In the left channel optocoupler group, the positive pin of the output terminal of the second optocoupler AA106 is combined with the positive pin of the output terminal of the second optocoupler AA106 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the B area pin AA110 in the left channel sound source chip AA107; the negative pin of the output end of the second optocoupler AA106 is connected to the negative pin of the output end of the second optocoupler AA106 in other optocoupler groups The matrix is synthesized according to the matrix key rules of the traditional electronic keyboard instrument, and then connected to the corresponding pins in the C area pin AA109 of the left channel sound source chip AA107.

(8) In the right channel optocoupler group, the positive pin of the output terminal of the second optocoupler AA112 is combined with the positive pin of the output terminal of the second optocoupler AA112 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the B area pin AA116 in the right channel sound source chip AA113; the output negative pin of the second optocoupler AA112 is connected to the output negative pin of the second optocoupler AA112 in other optocoupler groups Matrix synthesis is carried out through the matrix keys of traditional electronic keyboard instruments, and then connected to the corresponding pins in the pins AA115 of the C area in the right channel sound source chip AA113.

Embodiment 8: AA combination switch circuit keyboard partition adjustable structure technical solution

An electronic keyboard musical instrument, including a keyboard, a carbon film contact under it, and a sound source chip on a main board;

Switch circuits are arranged between the carbon film contacts below the keys and the corresponding sound source chips of the left and right hands;

The carbon film contacts in area A and area B are relatively independent, and all the carbon film contacts in area C under the keyboard are combined together and connected to the negative wire of the DC power supply;

The switch circuit includes a left channel switch circuit and a right channel switch circuit; the left channel switch circuit and the right channel switch circuit include a common DC power supply and an optocoupler group consistent with the number of keys; In the left channel switch circuit, after the positive wire of the DC power supply passes through the positive and negative poles of the output terminals of the optocoupler normally closed solid state relay corresponding to each key, it contacts with the carbon film contacts of the A and B areas below the corresponding keys. A left channel optocoupler group is arranged between them;

In the right channel switch circuit, after the positive wire of the DC power supply passes through the positive and negative poles of the output terminals of the ordinary optocoupler corresponding to each key, it is connected to the carbon film contacts in the A and B areas below the corresponding keys. A right channel optocoupler group is arranged between them;

The optocoupler normally closed solid-state relay in the left channel switch circuit and the common optocoupler input positive pole in the right channel switch circuit below the same key are connected together with the positive lead wire of the DC power supply;

The optocoupler normally closed solid-state relay in the left channel switch circuit and the negative pole of the common optocoupler input terminal in the right channel switch circuit below the same key are connected together through a controllable switch and the negative pole of the DC power supply wire connection;

The control of the two-in-one switch in sequence can realize the expansion of the left-hand keyboard area or the right-hand keyboard area.

In the left and right channel or multi-channel switch circuits, each optocoupler group in each switch circuit includes the first optocoupler corresponding to the carbon film contacts of the A area and the C area under the keyboard and the B area under the keyboard. The second optocoupler corresponding to the carbon film contacts in the zone and C zone;

AA combination switch circuit keyboard partition adjustable circuit working principle:

The switch circuit includes a left channel switch circuit and a right channel switch circuit corresponding to the left and right hands, and each switch circuit corresponds to one or a group of sound source chips.

Control the optocoupler normally closed solid-state relay of the left channel optocoupler group and control the normal optocoupler power-on of the right channel optocoupler group At this time, the optocoupler group corresponding to the left channel is powered off, and the optocoupler group corresponding to the right channel is powered on, so that the keyboard area of the right channel can be extended to the left channel. Conversely, when the optocoupler normally closed solid state relay controlling the optocoupler group of the left channel and the ordinary optocoupler controlling the optocoupler group of the right channel are powered off, the optocoupler group corresponding to the left channel is powered on, and the corresponding optocoupler group of the right channel is powered on. The optocoupler group is disconnected from the power supply, which can realize the expansion of the keyboard area of the left channel to the right channel. If you want the keyboard area of the left channel to expand, you need to turn off the 2-in-1 switch from left to right. If you want the keyboard area of the right channel to expand, you need to turn on the 2-in-1 switch from right to left.

Fig. 8 is a schematic diagram of the adjustable structure of the keyboard partition of the AA combination switch circuit of the electronic keyboard instrument.

In the figure, AA201 is the carbon film contact in area A. AA202 is a carbon film contact in C area. AA203 is a carbon film contact in area B. AA204 is a DC power supply. AA205 controllable switch. AA206 is the first optocoupler for the left channel. AA207 is the second optocoupler for the left channel. AA208 is a normally closed optocoupler solid state relay for the left channel. AA209 is the left channel audio chip. AA210 is the A pin of the left channel audio source chip. AA211 is the C area pin of the left channel audio source chip. AA212 is the pin of area B of the left channel audio source chip. AA213 is the first optocoupler for the right channel. AA214 is the second optocoupler for the right channel. AA215 is a common control optocoupler for the right channel. AA216 is the right channel audio chip. AA217 is the A pin of the right channel audio source chip. AA218 is the C area pin of the right channel audio source chip. AA219 is the pin of area B of the right channel audio source chip.

In the embodiment of the adjustable structure of the keyboard partition of the AA combination switch circuit:

(1) Two or two groups of relatively independent sound source chips are used, respectively corresponding to the left hand and right hand of playing keyboard instruments, and two or two groups of relatively independent sound source chips share a layer of keys.

(2) The carbon film contacts under the keys are divided into A-area carbon film contacts AA201, C-area carbon film contacts AA202 and B-area carbon film contacts AA203, wherein the A-area carbon film contacts AA201 and A-area carbon film contacts under each key are The carbon film contacts AA203 in the B area are relatively independent, and the carbon film contacts AA202 in the C area under all the keys are combined together and connected with the negative lead wire of the DC power supply AA204.

(3) Two groups of switch circuits corresponding to the left and right channels are arranged between the carbon film contacts and the two sound source chips, each group of switch circuits includes a common DC power supply AA204 and optocoupler groups consistent with the number of keys.

(4) In the left channel switch circuit, taking the 61-key electronic keyboard instrument as an example, the positive wire of the DC power supply passes through the positive and negative poles of the output terminals of 61 optocoupler normally closed solid-state relays AA208, and connects with the left channel 61 optocoupler groups The input terminal of the optocoupler is positively connected,

(5) In the right channel switch circuit, taking the 61-key electronic keyboard instrument as an example, the positive wire of the DC power supply passes through the positive and negative poles of the output terminals of 61 ordinary control optocouplers AA215, and then connects with the 61 optocoupler groups of the right channel The input terminal of the optocoupler is positively connected.

(6) The negative pole of the input terminal of the first optocoupler AA206 in the left channel optocoupler group is connected to the relatively independent carbon film contact AA201 under the corresponding keyboard, and the negative pole of the input terminal of the second optocoupler AA207 is relatively independent of the corresponding keyboard. of The carbon film contact AA203 in area B is connected.

(7) The negative pole of the input terminal of the first optocoupler AA213 in the right channel optocoupler group is connected to the relatively independent carbon film contact AA201 under the corresponding keyboard, and the negative pole of the input terminal of the second optocoupler AA214 is relatively independent of the corresponding keyboard. The carbon film contact AA203 of area B is connected.

(8) The positive pole of the input terminal of the optocoupler normally closed solid state relay AA208 and the common control optocoupler AA215 are connected to the positive pole of the DC power supply AA204 through wires, and the negative pole of the input terminal of the optocoupler normally closed solid state relay AA208 and the common control optocoupler AA215 is also connected Together, they are connected to the negative lead wire of the DC power supply AA204 through a relatively independent controllable switch AA205 or other switches.

(9) In the left channel optocoupler group, the positive pin of the output terminal of the first optocoupler AA206 is combined with the positive pin of the output terminal of the first optocoupler AA206 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the A area pin AA210 of the left channel sound source chip AA209, the negative pin of the output end of the first optocoupler AA206 is connected to the negative pin of the output end of the first optocoupler AA206 in other optocoupler groups Matrix synthesis is performed through the matrix keys of traditional electronic keyboard instruments, and then connected to the corresponding pins in the C area pin AA211 of the left channel sound source chip AA209;

(10) In the right channel optocoupler group, the positive pin of the output terminal of the first optocoupler AA213 is combined with the positive pin of the output terminal of the first optocoupler AA213 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the A area pins AA217 in the right channel sound source chip AA216; the output negative pins of the first optocoupler AA213 are connected with the output negative pins of the first optocoupler AA213 in other optocoupler groups Matrix synthesis is performed through the matrix keys of traditional electronic keyboard instruments, and then connected to the corresponding pins in the C-area pins AA218 of the right channel sound source chip AA216;

(11) In the left channel optocoupler group, the positive pin of the output terminal of the second optocoupler AA207 is combined with the positive pin of the output terminal of the second optocoupler AA207 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the B area pin AA212 in the left channel sound source chip AA209; the negative pin of the output end of the second optocoupler AA207 is connected to the negative pin of the output end of the second optocoupler AA207 in other optocoupler groups The matrix is synthesized through the matrix keys of traditional electronic keyboard instruments, and then connected to the corresponding pins in the pin AA211 of the C area in the left channel sound source chip AA209.

(12) In the right channel optocoupler group, the positive pin of the output terminal of the second optocoupler AA214 is combined with the positive pin of the output terminal of the second optocoupler AA214 in other optocoupler groups through the matrix key rules of traditional electronic keyboard instruments. , and then connected to the corresponding pins in the B area pin AA219 in the right channel sound source chip AA216; the output negative pin of the second optocoupler AA214 is connected to the output negative pin of the second optocoupler AA214 in other optocoupler groups Matrix synthesis is carried out through the matrix key rules of traditional electronic keyboard instruments, and then it is combined with the pin AA218 in the C area of the right channel sound source chip AA216 Corresponding pin connections in .

Specific Implementation Mode 9: Technical Solution for Timbre Superimposed Stereo

In the two-channel or multi-channel switch circuit, in each of the optocoupler groups of each of the switch circuits, twice or more than two times are arranged to correspond to the carbon film contacts of the A zone and the B zone below the keyboard. The optocouplers, which respectively control two or more related sound source chips, can realize the superimposed stereo sound of electronic keyboard instruments.

The tone superimposed stereo is applicable to the fixed structure of the AA combination partition, the adjustable structure of the AA combination partition, the new AB combination structure, the new BB combination structure, and the new CC combination structure.

How Voice Stacked Stereo works:

On the basis of the original AA combination partition fixed structure, AA combination partition adjustable structure, new AB combination structure, new BB combination structure, and new CC combination structure circuit, in each switch circuit, by multiplying the optocoupler in the optocoupler group The method of quantity controls two or more relatively independent sound source chips at the same time, which can realize the superposition of timbre in stereo.

Fig. 9 is a schematic diagram of electronic keyboard instrument timbre superimposed stereo dual timbre

In the figure, AA301 is the carbon film contact in area A. AA302 is a carbon film contact in C area. AA303 is a carbon film contact in the B area. AA304 DC power supply. AA305 is the first optocoupler for the left channel. AA306 is the second optocoupler for the left channel. AA307 is the third optocoupler for the left channel. AA308 is the fourth optocoupler for the left channel. AA309 is the first audio chip for the left channel. AA310 is the second audio chip for the left channel. AA311 is the first optocoupler for the right channel. AA312 is the second optocoupler for the right channel. AA313 is the third optocoupler for the right channel. AA314 is the fourth optocoupler for the right channel. AA315 is the first audio chip for the right channel. AA316 is the second sound source chip for the right channel.

In the implementation of the sound superimposed stereo:

(1) The specific implementation of the dual-timbre stereo dual-velocity sensing mode: taking the fixed structure of the AA combination partition as an example, in each switch circuit, the corresponding optocoupler group under the same key includes a first optocoupler, a second optocoupler, The third optocoupler and the fourth optocoupler. In the left and right channel switch circuits, the positive poles of the input terminals of all optocouplers are connected to the positive pole of the DC power supply, and the negative poles of the input terminals of the first optocoupler and the third optocoupler are connected to the relatively independent carbon film in area A under the corresponding keyboard. The contact AA301 is connected, and the negative poles of the input terminals of the second optocoupler and the fourth optocoupler are connected with the relatively independent carbon film contact AA303 of the B area under the corresponding keyboard.

(2) In the left channel switch circuit, the positive pin of the output terminal of the first optocoupler AA305 in the optocoupler group and the positive pin of the output terminal of the first optocoupler AA305 in the other optocoupler groups pass through the matrix keys of traditional electronic keyboard instruments Regularly carry out matrix synthesis, and then connect with the corresponding pins in the A area pins of the first audio source chip AA309 of the left channel; The negative pin of the output end undergoes matrix synthesis through the matrix keys of traditional electronic keyboard instruments, and then connects to the corresponding pins in the C area pins of the left channel first sound source chip AA309;

(3) In the left channel switch circuit, the positive pin of the output end of the second optocoupler AA306 in the optocoupler group and the positive pin of the output end of the second optocoupler AA306 in the other optocoupler groups pass through the matrix keys of the traditional electronic keyboard instrument Regularly carry out matrix synthesis, and then connect with the corresponding pins in the B area pins of the first sound source chip AA309 of the left channel; the negative pin of the output terminal of the second optocoupler AA306 is connected with the pins of the second optocoupler AA306 in other optocoupler groups The negative pin of the output end undergoes matrix synthesis through the matrix keys of traditional electronic keyboard instruments, and then connects to the corresponding pins in the C area pins of the left channel first sound source chip AA309;

(4) In the left channel switch circuit, the positive pin of the output terminal of the third optocoupler AA307 in the optocoupler group and the positive pin of the output terminal of the third optocoupler AA307 in the other optocoupler groups pass through the matrix keys of traditional electronic keyboard instruments Carry out matrix synthesis regularly, and then connect with the corresponding pins in the A area pins of the second audio source chip AA310 of the left channel; The negative pin of the output terminal is matrix synthesized through the matrix key rules of traditional electronic keyboard instruments, and then connected to the corresponding pins in the C area pins of the left channel second audio source chip AA310;

(5) In the left channel switch circuit, the positive pin of the output terminal of the fourth optocoupler AA308 in the optocoupler group and the positive pin of the output terminal of the fourth optocoupler AA308 in the other optocoupler groups pass through the matrix keys of traditional electronic keyboard instruments Carry out matrix synthesis regularly, and then connect with the corresponding pins in the B area pins in the second audio source chip AA310 of the left channel; The negative pin of the output terminal is matrix synthesized through the matrix key rules of traditional electronic keyboard instruments, and then connected to the corresponding pins in the C area pins of the left channel second audio source chip AA310;

(6) In the right channel switch circuit, the positive pin of the output end of the first optocoupler AA311 in the optocoupler group and the positive pin of the output end of the first optocoupler AA311 in the other optocoupler groups pass through the matrix keys of traditional electronic keyboard instruments Carry out matrix synthesis regularly, and then connect with the corresponding pins in the A area pins of the first sound source chip AA315 of the right channel; The negative pin of the output end is matrix synthesized through the matrix key rules of traditional electronic keyboard instruments, and then connected to the corresponding pins in the C area pins of the first sound source chip AA315 of the right channel;

(7) In the right channel switch circuit, the positive pin of the output end of the second optocoupler AA312 in the optocoupler group and the positive pin of the output end of the second optocoupler AA312 in the other optocoupler groups pass through the matrix keys of traditional electronic keyboard instruments Regularly carry out matrix synthesis, and then connect with the corresponding pins in the B area pins of the first sound source chip AA315 of the right channel; the negative pin of the output terminal of the second optocoupler AA305 is connected with the pin of the second optocoupler AA206 in other optocoupler groups The negative pin of the output end is matrix synthesized through the matrix key rules of traditional electronic keyboard instruments, and then connected to the corresponding pins in the C area pins of the first sound source chip AA315 of the right channel;

(8) In the right channel switch circuit, the positive pin of the output terminal of the third optocoupler AA313 in the optocoupler group is connected with other optocoupler The positive pin of the output terminal of the third optocoupler AA313 in the coupling group performs matrix synthesis through the matrix button rule of the traditional electronic keyboard instrument, and then connects with the corresponding pins in the A area pins in the second sound source chip AA316 of the right channel; The negative pin of the output terminal of the third optocoupler AA313 and the negative pin of the output terminal of the third optocoupler AA313 in other optocoupler groups are combined in a matrix through the matrix keys of traditional electronic keyboard instruments, and then combined with the second sound source chip AA316 of the right channel Corresponding pin connections in the C area pins;

(9) In the right channel switch circuit, the positive pin of the output end of the fourth optocoupler AA314 in the optocoupler group and the positive pin of the output end of the fourth optocoupler AA314 in the other optocoupler groups pass through the matrix keys of traditional electronic keyboard instruments Carry out matrix synthesis regularly, and then connect with the corresponding pins in the pins of area B in the second sound source chip AA316 of the right channel; The negative pin of the output end is matrix synthesized through the matrix key rules of traditional electronic keyboard instruments, and then connected to the corresponding pins in the C area pins of the right channel second sound source chip AA316;

(10) In the structure of dual tone and triple tone, in each switch circuit, the number of parallel optocouplers in the optocoupler group corresponding to each key is different. Double tone needs to be connected in parallel with twice the number of optocouplers, and triple tone Three times the number of optocouplers need to be connected in parallel. In addition, the number of optocouplers in different optocoupler groups is also different according to the number of force button sensing points. The optocoupler in the dual force sensing optocoupler group is connected with two carbon film contacts Correspondingly, the optocouplers in the three force-sensitive optocoupler groups correspond to the three carbon film contacts.

Figure 10 is a schematic diagram of the connection between the optocoupler and the different pins of the audio source chip in the optocoupler group in the old AB combined switch circuit, the old CC combined switch circuit and the old BB combined switch circuit

1 in the figure is the optocoupler corresponding to the carbon film contact in area A. 2 is the optocoupler corresponding to the carbon film contact in C area. 3 is an optocoupler corresponding to the carbon film contact in area B. 4 is a sound source chip. 5 is a pin of area A of the sound source chip, 6 is a pin of area C of the sound source chip, and 7 is a pin of area B of the sound source chip.

Figure 11 is a schematic diagram of the connection between the optocoupler and the different pins of the audio source chip in the optocoupler group in the new AB combined switch circuit, the new CC combined switch circuit, the new BB combined switch circuit and the AA combined switch circuit

1 in the figure is the optocoupler corresponding to the carbon film contacts in the A area and the C area. 2 is the optocoupler corresponding to the carbon film contacts of the B area and the C area. 3 is a sound source chip. 4 is a pin of area A of the sound source chip, 5 is a pin of area C of the sound source chip, and 6 is a pin of area B of the sound source chip.

Figure 12 is a schematic diagram of the connection between the carbon film contacts under the keys of a traditional electronic keyboard instrument and the corresponding pins of the sound source chip

Among the figure 1 is the common keyboard of a traditional electronic keyboard instrument. 2 is the carbon film contact below the traditional electronic keyboard instrument key. 3 is a sound source chip of a traditional electronic keyboard instrument. 4 is the carbon film contact of A zone below the key. 5 is the carbon film contact in C zone below the key. 6 is the carbon film contact in the B zone below the key. 7 is the A area pin of the sound source chip. 8 is the C area pin of the sound source chip. 9 is the B zone pin of the sound source chip.

The above-mentioned Figures 10 and 11 are explanations for the sentence "the output terminals of the optocouplers in the optocoupler group are connected to the corresponding pins of the relevant audio source chips" in the entire specification. Fig. 12 is an explanation of the prior art description in the background art.

In addition, Fig. 10 is also an explanation of the connection relationship between the pins of the sound source chip and the output terminal of the optocoupler in the old AB combination switch circuit of Fig. 2, the old CC combination switch circuit of Fig. 4 and the old BB combination switch circuit of Fig. 6 .

In addition, Fig. 11 is also the new AB combination switch circuit of Fig. 1, the new CC combination switch circuit of Fig. 3, the new BB combination switch circuit of Fig. 5, the AA combination partition fixed switch circuit of Fig. 7, and the AA combination partition adjustable of Fig. 8 Interpretation of the switching circuit and the connection relationship between the pins of the sound source chip and the output terminal of the optocoupler in the drawings such as the tone superimposed stereo in Figure 9.

For the sake of brevity and convenience of description, the description of words such as left and right channels in this article adopts a fixed method. In practical applications, the names of left and right channels can be converted to each other. Of course, the corresponding circuit connections Relationships need to be transformed accordingly.

In mid-to-high-end electronic keyboard instruments, the carbon film contacts are not directly connected to the sound source chip after matrix synthesis, but are connected to the sound source chip after keying the CPU. Different electronic keyboard instruments have different sound source chips, and their pin connections are also different. The keying CPU and sound source chips belong to the prior art, and will not be described in detail here.

The front end of the sound source chip mentioned in this article may include a keying cpu, and the sentence described in the article that it is connected to the corresponding pin of the relevant sound source chip can be interpreted as the connection with the corresponding pin of the relevant keying cpu.

All the above-mentioned technical solutions and embodiments adopted to solve the technical problems are also applicable to the electronic keyboard instrument with three-force-sensitive key structure.

An electronic keyboard musical instrument, comprising a key and a carbon film contact under the key and a sound source chip on the main board, characterized in that it includes a switch circuit board arranged between the key and/or the carbon film contact under the key and the sound source chip . The switch circuit board includes a new AB combination switch circuit board, an old AB combination switch circuit board, a new CC combination switch circuit board, an old CC combination switch circuit board, a new BB combination switch circuit board, an old BB combination switch circuit board, and an AA combination switch circuit board. Partition fixed switch circuit board, AA combined partition adjustable switch circuit board.

The same and similar parts of the various embodiments in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for related parts, please refer to the part of the description of the method embodiment. The systems and system embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is It can be located in one place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.

Professionals can further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the possible For interchangeability, in the above description, the composition and steps of each example have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Claims

An electronic keyboard musical instrument, comprising a key, a carbon film contact under the key, and a sound source chip on a main board, characterized in that: the key is a conductor key;

The carbon film contacts are relatively independent;

The left, right hand or each finger of playing the keyboard corresponds to one or a group of relatively independent sound source chips;

A switch circuit is arranged between the conductor key and the relatively independent carbon film contact below it and the sound source chip corresponding to the left, right hand or each finger;

Each of the switch circuits includes optocoupler groups consistent with the number of keys;

The switch circuit is connected to the wire output terminal on the conductor glove through a control wire;

Wearing the left, right hand or a certain finger of the conductive glove, playing any of the conductive keys can realize the control of the corresponding optocoupler group in the related switching circuit, and further realize the control of the related sound source chip. Corresponding pin control.
The electronic keyboard instrument according to claim 1, characterized in that:

The switch circuit includes a left channel switch circuit and a right channel switch circuit, and both the left channel switch circuit and the right channel switch circuit include: an independent DC power supply, and an optocoupler group consistent with the number of keys ;

Wherein, each of the optocoupler groups in the right channel switch circuit is controlled by a first optocoupler normally closed solid state relay and a second optocoupler normally closed solid state relay, and the first optocoupler normally closed solid state relay and The second optocoupler normally closed solid state relay is controlled by the left channel switch circuit;

When the left hand wearing a conductive glove hits the key, the corresponding optocoupler group in the left channel switch circuit will be activated, and at the same time, the corresponding photocoupler group in the right channel switch circuit under the same key will be closed through the corresponding optocoupler normally closed solid-state relay. Optocoupler group.
The electronic keyboard instrument according to claim 2, characterized in that:

In the left channel switch circuit, the optocoupler group is arranged between the positive wire of the left channel DC power supply and the relatively independent carbon film contacts in area A and carbon film contacts in area B under the conductor keys, The negative wire of the left channel DC power supply is connected to the wire output terminal on the left channel conductor glove; the carbon film contact in the C area is connected to the corresponding conductor key;

In the right channel switch circuit, after the positive wire of the right channel DC power supply passes through the positive and negative poles of the output terminal of the second optocoupler normally closed solid-state relay, the carbon in the A area relatively independent of the conductor key below The optocoupler group is arranged between the film contact and the carbon film contact in the B area; the carbon film contact in the C area passes through the positive and negative poles of the output terminal of the first optocoupler normally closed solid state relay, and is connected with the The negative lead wire of the right channel DC power supply is connected.
The electronic keyboard instrument according to claim 3, characterized in that:

In the right channel switch circuit, the positive poles of the input terminals of the first optocoupler normally closed solid state relay and the second optocoupler normally closed solid state relay are connected to the DC power supply in the left channel switch circuit The positive wires are connected, and the negative poles of the input terminals of the first optocoupler normally closed solid state relay and the second optocoupler normally closed solid state relay are connected to the corresponding conductor keys through the carbon film contacts in the C area.
The electronic keyboard instrument according to claim 2, characterized in that:

In the left channel switch circuit, the optocoupler group is arranged between the positive wire of the DC power supply and the conductor key, and the negative wire of the DC power supply is connected to the wire output terminal on the left channel conductor glove;

In the right channel switch circuit, after the positive wire of the DC power supply passes through the positive and negative poles of the output terminals of the second optocoupler normally closed solid state relay corresponding to each key, it is connected with each optocoupler in the optocoupler group. The positive input terminal of the optocoupler group is connected to the positive pole of the input terminal; the negative poles of the input terminals of all optocouplers in the optocoupler group are combined together and pass through the positive and negative pole pins of the output terminal of the first optocoupler normally closed solid state relay, and then connected to the negative pole wire of the DC power supply connect.
The electronic keyboard instrument according to claim 5, characterized in that:

In the right channel switch circuit, the positive poles of the input terminals of the first optocoupler normally closed solid state relay and the second optocoupler normally closed solid state relay are connected to the DC power supply in the left channel switch circuit The anode wires are connected, and the negative poles of the input terminals of the first optocoupler normally closed solid state relay and the second optocoupler normally closed solid state relay are directly connected to the corresponding conductor keys.
The electronic keyboard instrument according to claim 1, characterized in that:

In the two-channel switch circuit corresponding to the left and right hands playing the keyboard instrument or the multi-channel switch circuit corresponding to a plurality of fingers playing the keyboard instrument, each said switch circuit includes: a single-chip microcomputer circuit, and a keyboard The same number of optocoupler groups;

Between two or more than two single-chip microcomputer circuits, the input pin wires at the same position are combined together and connected to the corresponding conductor keys in sequence;

In each of the single-chip microcomputer circuits, the optocoupler group is arranged between the relatively independent output terminal and the VCC wire;

Each of the single-chip microcomputer circuits respectively leads a high and low level control line to be connected with the wire output terminal on the corresponding conductor glove.
The electronic keyboard instrument according to claim 7, characterized in that:

In each of the single-chip microcomputer circuits, each of the optocoupler groups is controlled by a drive optocoupler; the positive input terminal and the positive output terminal of the drive optocoupler are connected to the VCC wire, and the drive optocoupler The negative pole of the input terminal of the coupler is connected to the output terminal of the corresponding single-chip microcomputer circuit, the negative pole of the output terminal of the driving optocoupler is arranged between the carbon film contacts of the A area and the B area under the corresponding said conductor key. optocoupler group;

Each C-zone carbon film contact below the conductor key is connected to the output terminals corresponding to all the single-chip microcomputer circuits through a wire, between the carbon film contacts in the C-zone and the corresponding output terminals of each single-chip microcomputer circuit A directional diode is arranged.
The electronic keyboard instrument according to claim 7, characterized in that:

In each of the single-chip microcomputer circuits, the VCC wire is connected to the positive pole of the input end of each optocoupler in the optocoupler group corresponding to all the conductor keys, and the input end of each optocoupler in the optocoupler group is The negative electrode is connected to the corresponding output terminal of the single-chip microcomputer circuit.
The electronic keyboard instrument according to claim 1, characterized in that:

The switch circuit includes: a left channel switch circuit and a right channel switch circuit;

Both the left channel switch circuit and the right channel switch circuit include: an independent DC power supply, and an optocoupler group consistent with the number of keys;

The current directions of the left channel switch circuit and the right channel switch circuit are opposite.
The electronic keyboard instrument according to claim 10, characterized in that:

In the left channel switch circuit, the optocoupler group is arranged between the positive wire of the DC power supply and the carbon film contacts of the A zone and the B zone below each of the conductor keys, and the negative wire of the DC power supply is connected to the carbon film contacts of the B zone. The wire output terminal connection on the left channel conductor glove;

In the right channel switch circuit, the optocoupler group is arranged between the negative lead wire of another direct current power supply and the carbon film contacts of area A and area B under each of the conductor keys, and the positive lead wire of the direct current power supply Connect with the wire output terminal on the right channel conductor glove;

The carbon film contacts in the C area are connected with the corresponding conductor keys.
The electronic keyboard instrument according to claim 10, characterized in that:

Said left channel switch circuit is arranged with said optocoupler group between the positive wire of its DC power supply and each said conductor key, and the negative wire of the DC power supply is connected to the wire output terminal on the left channel conductor glove;

The right channel switch circuit is arranged with the optocoupler group between the negative wire of another DC power supply and each of the conductor keys, and the positive wire of the DC power supply is connected to the wire output terminal on the right channel conductor glove .
According to the electronic keyboard instrument described in any one of claims 3, 8, 11, it is characterized in that:

In the left and right channel or multi-channel switch circuits, each optocoupler group in each switch circuit includes a first optocoupler corresponding to the carbon film contact in the area A below the keyboard and a contact with the area B below the keyboard. The second optocoupler corresponding to the carbon film contact;

In each switch circuit, the positive and negative pins of the output terminals of each optocoupler in the optocoupler group are respectively connected to the same output pins of the optocouplers at the same position in other optocoupler groups of the same circuit through the traditional electronic keyboard instrument. Matrix synthesis is performed according to the matrix keys, and then connected to the corresponding pins of the related audio chip.
According to the electronic keyboard instrument described in any one of claims 5, 9, 12, it is characterized in that:

In the two-channel or multi-channel switch circuit, one pin of each optocoupler output end in the optocoupler group is connected to the corresponding carbon film contact wire, and the other pin is connected to the other optocoupler in the same circuit. The same pins of the optocouplers at the same position in the group are combined in a matrix through the matrix keys of traditional electronic keyboard instruments, and then connected to the corresponding pins of the related sound source chips.
According to the electronic keyboard instrument described in any one of claims 3, 8, 11, it is characterized in that:

In the two-channel or multi-channel switch circuit, in each of the optocoupler groups of each of the switch circuits, two or more carbon film contacts with the A area and B area under the keyboard are arranged. Corresponding optocouplers, they respectively control the corresponding pins in the related two or more than two sound source chips, which can realize the superimposed stereo sound of electronic keyboard musical instruments.
An electronic keyboard musical instrument, comprising a key, carbon film contacts below it, and a sound source chip on a main board, characterized in that: the left and right hands for playing the keyboard musical instrument respectively correspond to one or a group of relatively independent sound source chips;

All the keys are divided into left keyboard and right keyboard. The carbon film contacts under the keys in the left keyboard area are arranged with a left channel switch circuit between the sound source chip corresponding to the left hand; the carbon film contacts under the keys in the right keyboard area are connected with the A right channel switch circuit is arranged between the sound source chips corresponding to the right hand;

The non-common carbon film contacts in area A and area B under the keyboard are relatively independent, and all the public carbon film contacts in area C under the keyboard are combined and connected to the negative lead of the DC power supply;

The left channel switch circuit and the right channel switch circuit include: a common DC power supply, and an optocoupler group with the same number of keys in the corresponding partition.
The electronic keyboard instrument according to claim 16, characterized in that:

In the left channel switch circuit, a left channel optocoupler group is arranged between the positive wire of the DC power supply and the relatively independent carbon film contacts of the A zone and the B zone below each key in the left keyboard area;

In the right channel switch circuit, a right channel optocoupler group is arranged between the positive wire of the DC power supply and the relatively independent carbon film contacts of the A zone and B zone under each key of the right keyboard area.
The electronic keyboard instrument according to claim 16, characterized in that:

In the two-channel switch circuit, in each of the optocoupler groups of each of the switch circuits, twice or more optocouplers corresponding to the carbon film contacts of the A area and the B area under the keyboard are arranged. , they respectively control the corresponding pins in two or more than two related sound source chips, which can realize the superimposed stereo sound of electronic keyboard instruments.
The electronic keyboard instrument according to claim 16, characterized in that:

In the left channel switch circuit, after the positive lead wire of the DC power supply passes through the positive and negative poles of the output terminals of the optocoupler normally closed solid state relay corresponding to each key, it is connected to the carbon film in the A area and the B area below the corresponding key. A left channel optocoupler group is arranged between the contacts;

In the right channel switch circuit, after the positive wire of the DC power supply passes through the positive and negative poles of the output terminals of the common optocoupler corresponding to each key, it is connected to the carbon film contacts in the A and B areas below the corresponding keys. A right channel optocoupler group is arranged between them.
The electronic keyboard instrument according to claim 19, characterized in that:

The optocoupler normally closed solid-state relay in the left channel switch circuit and the common optocoupler input positive pole in the right channel switch circuit below the same key are connected together with the positive lead wire of the DC power supply;

The optocoupler normally closed solid-state relay in the left channel switch circuit and the negative pole of the common optocoupler input terminal in the right channel switch circuit below the same key are connected together through a controllable switch and the negative pole of the DC power supply wire connection;

The control of the two-in-one switch in sequence can realize the expansion of the left-hand keyboard area or the right-hand keyboard area.
An electronic keyboard musical instrument, including the keys and the carbon film contacts under the keys, and the sound source chip on the main board. The signs are:

It includes a switch circuit board arranged between the keys and/or the carbon film contacts under the keys and the sound source chip.