A converter for MIDI to TRS interface

Abstract

The present invention discloses a MIDI to TRS interface converter, comprising at least one TRS interface for connecting a TRS interface instrument, a MIDI five-pin interface for connecting a MIDI interface instrument, a central unit connecting the TRS interface and the MIDI five-pin interface, and a switching circuit connected to the TRS interface for switching the TRS interface type to match different TRS interface instruments. Compared with the prior art, the TRS interface of the present invention can switch and match a variety of TRS interface instruments, thereby accommodating the use of a variety of TRS interface instruments and providing convenience for connecting the converter.

Description

Technical Field

[0001] The present invention relates to the electronic musical instrument industry, and in particular to a MIDI to TRS interface converter. Background Art

[0002] MIDI, a digital musical instrument interface, is an interface available on many electronic instruments. Because the traditional 5-pin MIDI interface is relatively large, many instruments use 3.5mm or 6.35mm TRS interfaces to communicate MIDI messages. The existing method of connecting TRS interfaces to TRS interfaces is to use a conversion cable to complete the connection. However, since the TRS line order of different instruments varies, different cables are required to connect them. At the same time, a single TRS interface cannot connect to multiple instruments with TRS interfaces at the same time.

[0003] TRS interfaces are divided into 2-core (Tip / Ring, Sleeve) and 3-core (Tip, Ring, Sleeve). Different instrument manufacturers use different types of TRS interfaces to communicate MIDI messages. This makes it inconvenient for many instruments with TRS interfaces to communicate with instruments with multiple TRS type interfaces. It is also inconvenient for instruments with different TRS type interfaces to communicate with each other.

[0004] Therefore, how to design a MIDI to TRS interface converter that can adapt to the use of various types of TRS interface musical instruments is a technical problem that needs to be solved urgently in the industry. Summary of the Invention

[0005] Aiming at the problem in the prior art that the TRS interface cannot be used with a variety of TRS interface musical instruments, the present invention proposes a MIDI to TRS interface converter.

[0006] The technical solution of the present invention is to propose a MIDI to TRS interface converter, which includes at least one TRS interface for connecting a TRS interface musical instrument, a MIDI five-pin interface for connecting a MIDI interface musical instrument, a central unit connecting the TRS interface and the MIDI five-pin interface, and a switching circuit that is matched one-to-one with the TRS interface and is used to switch the TRS interface type to match different TRS interface musical instruments.

[0007] Furthermore, the TRS interface includes a first connection terminal, a second connection terminal, a third connection terminal, a fourth connection terminal, and a fifth connection terminal for connecting to a TRS interface musical instrument. The switching circuit includes a resistor R1, a resistor R2, and a dip switch SW1. The dip switch SW1 includes a switch S1, a switch S2, a switch S3, and a switch S4 that can be switched independently.

[0008] One end of the resistor R1 is connected to the data signal, and the other end is connected to the first ends of the switches S2 and S3 respectively. The second end of the switch S2 is connected to the fifth connection end, and the second end of the switch S3 is connected to the second connection end. One end of the resistor R2 is connected to the 5V voltage, and the other end is connected to the first ends of the switches S1 and S4 respectively. The second end of the switch S1 is connected to the fifth connection end, and the second end of the switch S4 is connected to the second connection end. The first connection end is grounded.

[0009] Furthermore, the central unit comprises:

[0010] a MIDI message separation module, one end of which is connected to the MIDI five-pin interface and the other end of which is connected to at least one of the TRS interfaces, for receiving MIDI information from a MIDI interface instrument and separating the MIDI information to match the output of each TRS interface;

[0011] An MCU processing module, one end of which is connected to at least one of the TRS interfaces and the other end is connected to the MIDI five-pin interface, for receiving input signals of at least one TRS interface instrument, and combining the input signals and matching them with the output of the MIDI five-pin interface;

[0012] The selection switch is used to switch the central unit to work in the MIDI message separation module or the MCU processing module.

[0013] Furthermore, the MIDI five-pin interface includes:

[0014] A MIDI IN interface, which is used to receive MIDI signals input by a MIDI interface instrument and transmit the MIDI signals to the MIDI message separation module;

[0015] The MIDI OUT interface is used to receive the combined input signal sent by the MCU processing module and transmit the combined input signal to the MIDI interface instrument.

[0016] Furthermore, the MIDI five-pin interface further includes:

[0017] The MIDI THRU interface is used to receive MIDI signals input from the MIDI IN interface and transmit the MIDI signals to the MIDI interface instrument.

[0018] Furthermore, a first isolation module is provided between each TRS interface and the central unit, and a second isolation module is provided between the MIDI five-pin interface and the central unit. The input ends of the first isolation module and the second isolation module use high-speed optocoupler isolation, and the output ends use dual triode isolation.

[0019] Furthermore, it also includes a power supply module, which is used to receive power from an external power source and output a 5V voltage for the converter to work.

[0020] Furthermore, it also includes a communication indicator light provided on the converter, and the communication indicator light is used to display the working status of the converter.

[0021] Furthermore, by switching the switches S1, S2, S3 and S4, the TRS interface can operate in five modes to match five TRS interface instruments, namely:

[0022] In the first mode, the switch S1 and the switch S3 are closed; in the second mode, the switch S2 and the switch S4 are closed; in the third mode, the switch S3 is closed; in the fourth mode, the switch S2 is closed; and in the fifth mode, the switch S2 and the switch S3 are closed.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] The TRS interface of the present invention can switch and match multiple types of TRS interfaces, can adapt to the use of multiple TRS interface instruments, and provide convenience for the connection of the converter; in addition, the present invention is provided with at least one TRS interface, and through the setting of the central unit, the present invention can simultaneously match the use of multiple TRS interface instruments, thereby improving the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a line sequence diagram of the MIDI five-pin interface of the present invention;

[0027] Figure 2 This is a connection diagram for various types of TRS interfaces;

[0028] Figure 3 is a connection diagram of the switching circuit;

[0029] Figure 4 It is a working principle diagram of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] Thus, a feature indicated in this specification is intended to illustrate one of the features of one embodiment of the present invention, rather than to imply that every embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other, not explicitly described, combinations. Thus, unless otherwise noted, the described combinations are not intended to be limiting.

[0033] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0034] TRS interfaces are available in two types: two-core (Tip / Ring, Sleeve) and three-core (Tip, Ring, Sleeve). Different instrument manufacturers use different TRS interface types to communicate MIDI messages. This results in inconvenience for many TRS-equipped instruments when communicating with other instruments with multiple TRS interface types, as well as communication between instruments with different TRS interface types. The present invention proposes a MIDI-to-TRS converter whose TRS interface, through a switching circuit configuration, can be used with multiple TRS interface types, thereby meeting the needs of various instruments with TRS interfaces.

[0035] The MIDI to TRS interface converter proposed in the present invention includes at least one TRS interface for connecting to a TRS interface musical instrument, a MIDI five-pin interface for connecting to a MIDI interface musical instrument, a central processing unit connecting the TRS interface and the MIDI five-pin interface, and a switching circuit set to match each TRS interface one by one. The present invention can match the use of different TRS interface musical instruments through the setting of the switching circuit.

[0036] For details, see Figure 2 ,The existing TRS interface is divided into 2-core (Tip / Ring, Sleeve) and 3-core (Tip, Ring, Sleeve), which generally has five types, namely TYPE-A (MIDI STANDARD), which is 3-core (Tip, Ring, Sleeve). When in use, the Tip end is used to receive the Data signal, the Ring end is used to receive the 5V voltage signal, and the Sleeve end is used for grounding;

[0037] TYPE-B, which has 3 cores (Tip, Ring, Sleeve). When in use, the Tip end is used to receive 5V voltage signal, the Ring end is used to receive Data signal, and the Sleeve end is used for grounding;

[0038] TIP ACTIVE, which has 2 cores (Tip / Ring, Sleeve). When in use, the Tip end is used to receive the Data signal and the Sleeve end is used for grounding;

[0039] RING ACTIVE, which has 2 cores (Tip / Ring, Sleeve). When in use, the Ring end is used to receive the Data signal and the Sleeve end is used for grounding;

[0040] TIP&RING ACTIVE, which has 3 cores (Tip, Ring, Sleeve). When in use, the Tip and Ring ends are used to receive data signals, and the Sleeve end is used for grounding.

[0041] The TRS interface proposed in the present invention includes five connection ends for connecting to TRS interface musical instruments, namely a first connection end, a second connection end, a third connection end, a fourth connection end and a fifth connection end. The first connection end is used to connect to the sleeve end of the TRS interface, the second connection end is used to connect to the tip end of the TRS interface, the fifth connection end is used to connect to the ring end of the TRS interface, and the third connection end and the fourth connection end are left unconnected. In addition, the first connection end, the second connection end and the fifth connection end are also connected to a switching circuit for switching the signals output to the first connection end, the second connection end and the fifth connection end to match different TRS interface uses.

[0042] For details, see Figure 3 The switching circuit includes a resistor R1, a resistor R2, and a dip switch SW1. The dip switch SW1 has four switches that can be switched independently, namely switch S1, switch S2, switch S3 and switch S4;

[0043] Among them, one end of the resistor R1 is connected to the data signal (Data signal), and the other end is connected to the first end of the switch S2 and the first end of the switch S3 respectively. The second end of the switch S2 is connected to the fifth connection end, and the second end of the switch S3 is connected to the second connection end. One end of the resistor R2 is connected to the 5V voltage, and the other end is connected to the first end of the switch S1 and the first end of the switch S4 respectively. The second end of the switch S1 is connected to the fifth connection end, and the second end of the switch S4 is connected to the second connection end. The first connection end is grounded. ( Figure 3 The numbers 1, 2, 3, 4, and 5 represent the first connection end, the second connection end, the third connection end, the fourth connection end, and the fifth connection end of the TRS interface respectively.

[0044] When used with a TRS interface musical instrument, the Sleeve end of the TRS interface is connected to the first connection end of the TRS interface, the Tip end is connected to the second connection end of the TRS interface, and the Ring end is connected to the fifth connection end of the TRS interface. Then, by adjusting the dip switch SW1, different types of TRS interfaces can be matched.

[0045] Specifically, by adjusting the states of switch S1, switch S2, switch S3, and switch S4, the TRS interface can operate in five modes to match five TRS interface instruments. When switch S1 and switch S3 are closed, the TRS interface is in the first mode. At this time, the first connection end of the TRS interface is grounded, the second connection end receives a data signal, and the fifth connection end receives a 5V voltage signal. Since the first connection end is connected to the sleeve end of the TRS interface, the second connection end is connected to the tip end of the TRS interface, and the fifth connection end is connected to the ring end of the TRS interface, that is, in the first mode, the TRS interface can match the 3-core (Tip, Ring, Sleeve) TYPE-A (MIDI STANDARD) for use;

[0046] When switches S2 and S4 are closed, the TRS interface is in the second mode. At this time, the first connection end of the TRS interface is grounded, the second connection end receives a 5V voltage signal, and the fifth connection end receives a data signal. Since the first connection end is connected to the sleeve end of the TRS interface, the second connection end is connected to the tip end of the TRS interface, and the fifth connection end is connected to the ring end of the TRS interface, in the second mode, the TRS interface can be used with a 3-core (Tip, Ring, Sleeve) TYPE-B cable.

[0047] When switch S3 is closed, the TRS interface is in the third mode. At this time, the first connection end of the TRS interface is grounded, the second connection end receives the data signal, and the fifth connection end is not connected to the circuit. Since the fifth connection end is not connected to the circuit, the TRS interface is compatible with 2-core (Tip / Ring, Sleeve) use. Since the first connection end is used to connect to the sleeve end of the TRS interface and the second connection end is used to connect to the tip end of the TRS interface, in the third mode, the MIDI five-pin interface can be compatible with the TIP ACTIVE use of the 2-core (Tip / Ring, Sleeve)

[0048] When switch S2 is closed, the TRS interface is in the fourth mode. At this time, the first connection end of the TRS interface is grounded, the fifth connection end receives the data signal, and the second connection end is not connected to the circuit. Since the second connection end is not connected to the circuit, the TRS interface is compatible with 2-core (Tip / Ring, Sleeve) use. Since the first connection end is used to connect to the sleeve end of the TRS interface and the fifth connection end is used to connect to the ring end of the TRS interface, that is, in the fourth mode, the MIDI five-pin interface can be compatible with the 2-core (Tip / Ring, Sleeve) RING ACTIVE use;

[0049] When switches S2 and S3 are closed, the TRS interface is in the fifth mode. At this time, the first connection end of the TRS interface is grounded, the second connection end receives the data signal, and the fifth connection end receives the data signal. Since the first connection end is connected to the sleeve end of the TRS interface, the second connection end is connected to the tip end of the TRS interface, and the fifth connection end is connected to the ring end of the TRS interface, in the fifth mode, the TRS interface can be used with a three-core (tip, ring, sleeve) tip & ring active connection.

[0050] That is, by setting the switching circuit in the present invention, the TRS interface of the present invention can be matched with at least five different types of TRS interfaces, which greatly improves the versatility of the present invention.

[0051] The present invention is provided with at least one TRS interface, which can be used with at least one TRS interface instrument at the same time. Figure 4 In a preferred embodiment of the present invention, there are five TRS interfaces, namely TRS1, TRS2, TRS3, TRS4, and TRS5. To match the use of the five TRS interfaces, the central unit proposed in the present invention includes a MIDI message separation module, an MCU processing module, and a selection switch.

[0052] One end of the MIDI message separation module is connected to the MIDI five-pin interface, and the other end is connected to at least one TRS interface, for receiving MIDI information of the MIDI interface instrument and separating the MIDI information to match the output of each TRS interface;

[0053] One end of the MCU processing module is connected to at least one TRS interface and the other end is connected to the MIDI five-pin interface, for receiving input signals of at least one TRS interface instrument, and combining the input signals and matching them with the MIDI five-pin interface output;

[0054] The switching switch is used to switch the central unit to work in the MIDI message separation module or the MCU processing module. Specifically, when the central unit works in the MIDI message separation module, the converter is used to transmit MIDI data to the TRS interface and communicate with the TRS interface instrument; when the central unit works in the MCU processing module, the converter is used to receive data transmitted by the TRS interface instrument and communicate with the MIDI instrument through the MIDI five-pin interface.

[0055] The present invention uses a MIDI message separation module, an MCU processing module, and a switching switch to enable the present invention to be adapted to multiple TRS interface musical instruments at the same time and to receive and send data, thereby greatly improving the convenience of use of the present invention.

[0056] For further information, see Figure 4 The MIDI five-pin interface includes a MIDI IN interface and a MIDI OUT interface. The MIDI IN interface is used to receive MIDI signals input by MIDI interface instruments and transmit MIDI signals to the MIDI message separation module. The MIDI IN interface is used in conjunction with the MIDI message separation module and the TRS interface to realize data transmission from one MIDI interface instrument to multiple TRS interface instruments.

[0057] The MIDI OUT port receives the combined input signal from the MCU processing module and transmits it to the MIDI interface instrument. The MIDI OUT port, when used in conjunction with the MCU processing module and the TRS port, can transmit data from multiple TRS interface instruments to a single MIDI interface instrument.

[0058] In addition, the MIDI five-pin interface proposed in the present invention also includes a MIDI THRU interface, which is used to receive MIDI signals input from the MIDI IN interface and transmit the MIDI signals to the MIDI interface instrument. By using the MIDI THRU interface in conjunction with the MIDI IN interface, data transmission between two MIDI interface instruments can be achieved.

[0059] See Figure 1 , which is the line sequence diagram of the MIDI five-pin interface, the second end is grounded, the fourth end is connected to the 5V voltage, and the fifth end is connected to the data signal.

[0060] For further information, see Figure 4 A first isolation module ( Figure 4 Isolation module 1, isolation module 2, isolation module 3, isolation module 4, isolation module 5 are all first isolation modules), and a second isolation module is also provided between the MIDI five-pin interface and the central unit ( Figure 4 The first and second isolation modules utilize high-speed optocouplers for input isolation and dual triodes for output isolation. This design not only protects the instrument interface from damage caused by high current or voltage, but also ensures fast MIDI information transmission, significantly enhancing the safety of the present invention.

[0061] The present invention further includes a power module for receiving power from an external power source. This module converts the external power input voltage (input voltage range: 5-12V) into a 5V voltage that matches the operating voltage of the converter modules. This power module can be a conventional DC / DC module capable of DC-DC voltage conversion. It can output a voltage that matches the operating voltage of the converter modules to maintain the converter's operation.

[0062] Furthermore, a communication indicator light is provided on the converter, which is used to display the working status of the converter. When the converter is powered, it is in a constantly on state and flashes when MIDI information is received. The faster the frequency of MIDI information communication, the faster the flashing speed.

[0063] See Figure 5 , which is a schematic diagram of the structure of the present invention. The MIDI THRU interface, MIDI IN interface, MIDI OUT interface, and five TRS interfaces (TRS1 interface, TRS2 interface, TRS3 interface, TRS4 interface, TRS5 interface) are all located on the same housing. The housing is also provided with a DC IN interface, which is connected to the power module and is used to receive external DC 5~12V power supply and convert it into a voltage that can work for powering the present invention. The power indicator light (PWR / MIDI) is set on the housing to display the working status of the converter. Each TRS interface is provided with a dip switch, which consists of 4 switches, corresponding to the switch S1, switch S2, switch S3, and switch S4 of the switching switch in the present invention. Different TRS interfaces can be matched by different switching modes.

[0064] The present invention has at least three connection modes, namely:

[0065] 1. The MIDI IN interface is connected to a MIDI interface instrument, and at least one TRS interface is connected to a TRS interface instrument. At this time, the converter receives the MIDI signal of the external MIDI interface instrument, separates it and sends it to at least one TRS interface instrument;

[0066] 2. The MIDI OUT interface is connected to a MIDI interface instrument, and at least one TRS interface is connected to a TRS interface instrument. At this time, the converter receives the input signal of at least one TRS interface instrument, combines the input signal and sends it to the MIDI interface instrument;

[0067] 3. The MIDI IN interface and MIDI THRU interface are connected to two MIDI interface instruments respectively to realize the transmission of MIDI signals between the two MIDI interface instruments.

[0068] It can be seen from the above that, compared with the prior art, the present invention can not only match the use of different types of TRS interface instruments, but also simultaneously complete the signal transmission between multiple TRS interface instruments and MIDI interface instruments, as well as the signal transmission between two MIDI interface instruments, which greatly improves the convenience of use of the present invention and its versatility in various occasions.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A MIDI to TRS interface converter, characterized in that: The device comprises at least one TRS interface for connecting a TRS interface musical instrument, a MIDI five-pin interface for connecting a MIDI interface musical instrument, a central unit connecting the TRS interface and the MIDI five-pin interface, and a switching circuit that is matched one-to-one with the TRS interface and is used to switch the TRS interface type to match different TRS interface musical instruments; The TRS interface includes a first connection terminal, a second connection terminal, a third connection terminal, a fourth connection terminal, and a fifth connection terminal for connecting to a TRS interface musical instrument. The switching circuit includes a resistor R1, a resistor R2, and a dip switch SW1. The dip switch SW1 includes a switch S1, a switch S2, a switch S3, and a switch S4 that can be switched independently. One end of the resistor R1 is connected to the data signal, and the other end is connected to the first ends of the switches S2 and S3, respectively. The second end of the switch S2 is connected to the fifth connection end, and the second end of the switch S3 is connected to the second connection end. One end of the resistor R2 is connected to the 5V voltage, and the other end is connected to the first ends of the switches S1 and S4, respectively. The second end of the switch S1 is connected to the fifth connection end, and the second end of the switch S4 is connected to the second connection end. The first connection end is grounded. The central unit comprises: a MIDI message separation module, one end of which is connected to the MIDI five-pin interface and the other end of which is connected to at least one of the TRS interfaces, for receiving MIDI information from a MIDI interface instrument and separating the MIDI information to match the output of each TRS interface; An MCU processing module, one end of which is connected to at least one of the TRS interfaces and the other end is connected to the MIDI five-pin interface, for receiving input signals of at least one TRS interface instrument, and combining the input signals and matching them with the output of the MIDI five-pin interface; A selection switch for switching the central unit to operate in the MIDI message separation module or the MCU processing module; By switching the switches S1, S2, S3 and S4, the TRS interface can operate in five modes to match five TRS interface instruments, namely: In the first mode, the switch S1 and the switch S3 are closed; in the second mode, the switch S2 and the switch S4 are closed; in the third mode, the switch S3 is closed; in the fourth mode, the switch S2 is closed; and in the fifth mode, the switch S2 and the switch S3 are closed.

2. The converter according to claim 1, characterized in that The MIDI five-pin interface includes: A MIDI IN interface, which is used to receive MIDI signals input by a MIDI interface instrument and transmit the MIDI signals to the MIDI message separation module; The MIDI OUT interface is used to receive the combined input signal sent by the MCU processing module and transmit the combined input signal to the MIDI interface instrument.

3. The converter according to claim 2, characterized in that The MIDI five-pin interface also includes: The MIDI THRU interface is used to receive MIDI signals input from the MIDI IN interface and transmit the MIDI signals to the MIDI interface instrument.

4. The converter according to claim 1, wherein A first isolation module is provided between each TRS interface and the central unit, and a second isolation module is provided between the MIDI interface and the central unit. The input ends of the first isolation module and the second isolation module adopt high-speed optocoupler isolation and the output ends adopt dual triode isolation.

5. The converter according to claim 1, wherein: It also includes a power supply module, which is used to receive power from an external power source and output a 5V voltage for the converter to work.

6. The converter according to claim 1, characterized in that It also includes a communication indicator light provided on the converter, and the communication indicator light is used to display the working status of the converter.

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