JP3037866B2 - MIDI signal transceiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a MIDI (Musical Instrument Digital Input) used for transmitting music performance information.
The present invention relates to a MIDI signal transmitting and receiving apparatus for transmitting and receiving signals to and from a musical instrument such as a keyboard and a MIDI guitar, a tone generator, and a sequencer.

[0002]

2. Description of the Related Art There is a MIDI signal in accordance with the MIDI standard as a signal for making performance information such as pitch information, velocity information, tone color information and control information compatible with each other. Is used to control a sound source device in a MIDI musical instrument system having a keyboard (MIDI instrument) and a sound source device (MIDI instrument) separate from the keyboard. In this case, in the conventional MIDI musical instrument system, the keyboard and the tone generator are connected by a MIDI cable. Then, for example, when a note is turned on with a keyboard, a MIDI signal including key ON information, pitch information, velocity information, and the like is output from the keyboard to the tone generator via a MIDI cable. On the other hand, the tone generator generates a musical tone based on the input MIDI signal.

[0003]

However, such a conventional MIDI musical instrument system has the following problems. First, when installing a MIDI instrument system,
The keyboard and the tone generator must be connected by a MIDI cable, and the connection of the MIDI cable itself is complicated. This is particularly noticeable when a plurality of tone generators are connected to the keyboard. Further, in this case, if it is attempted to control sound generation of a plurality of tone generators by a chain connection using a “THRU” terminal provided on the tone generator side, photoelectric conversion by a photocoupler used in a MIDI signal receiving circuit is performed. Due to the time difference between the rise and fall of the electric signal at the time, the signal waveform of the MIDI signal may be degraded, and an error may occur on the sound source device side. Furthermore, when playing a MIDI guitar or a handy-type keyboard, the MIDI cable is in the way and the player cannot move freely to perform the desired performance. The advantage of making it lighter and easier to play is lost. In addition, since the MIDI standard specifies that the distance that can be transmitted by a MIDI cable is up to 15 m, it is not possible to play a performance device such as a keyboard and a sound source device at a greater distance.

[0004] The present invention has been made in view of the above problems, and enables transmission of MIDI signals between a plurality of MIDI musical instruments without using a MIDI cable. In response to input and reception of MIDI signals from both the MIDI instrument and the other MIDI instruments, the other MIDI instruments,
It is another object of the present invention to provide a MIDI signal transmitting / receiving apparatus capable of transmitting or outputting a MIDI signal to a connected MIDI musical instrument.

[0005]

In order to achieve the above object, a MIDI signal transmitting / receiving apparatus according to claim 1 is connected to a MIDI musical instrument, and transmits a MIDI signal for transmitting performance information to another MIDI musical instrument. A MIDI signal transmitting / receiving apparatus for transmitting a modulated radio signal based on an input MIDI signal and transmitting a modulated radio signal, and a MIDI signal output from another MIDI musical instrument.
A receiving unit that receives a wireless signal obtained by modulating a high-frequency signal based on the IDI signal, demodulates a MIDI signal from the received wireless signal, and outputs the demodulated MIDI signal, and a MIDI output from a connected MIDI musical instrument MIDI data based on the signal and output from the receiver
A transmission data temporary storage unit for storing demodulated MIDI data based on the received MIDI signal, and a transmission data temporary storage unit
Read MIDI data, and
MIDI signal that outputs a MIDI signal based on the
Signal output unit and demodulation M stored in the transmission data temporary storage unit.
Reads IDI data and converts demodulated MIDI data
Output a demodulated MIDI signal to the connected MIDI instrument.
And a connected MIDI
Whether a MIDI signal has been output from the musical instrument and whether it has been received
Detects whether a demodulated MIDI signal has been output from the section
A MIDI transmission / reception switching unit for activating one of the transmission unit and the reception unit;
The signal detector detects that the MIDI signal has been output from the detector.
When the MIDI signal output section is activated,
The transmission / reception switching unit activates the transmission unit and demodulates from the reception unit.
The signal detector detects that the MIDI signal has been output.
Occasionally, the transmission / reception switching unit maintains the receiving unit in the operating state
In addition, the demodulation MIDI signal output unit operates .

According to a second aspect of the present invention, there is provided the MIDI signal transmitting and receiving apparatus according to the first aspect, wherein note-on data of MIDI data based on a MIDI signal output from a connected MIDI musical instrument is written. And a MIDI corresponding to the stored note-on data while writing the note-on data of the MIDI signal output from the MIDI musical instrument to the memory.
When note-off data of the data is input, note-data writing means for erasing note-on data and note data detection means for detecting the presence or absence of note-on data stored in the memory are further provided. When the note data detection means detects that the note-on data is not stored in the memory, the operation of the transmission unit is stopped and the reception unit is operated.

[0007] sending and receiving apparatus of the MIDI signal according to claim 3, wherein, in the receiving device the MIDI signal according to claim 2, upon detecting the note data detecting means that no note-on data is written into the memory further comprising a counter that starts counting, the reception switching section, Roh
Note data detection means writes note-on data to memory
Detecting that no written, and, until the count value of the counter reaches a predetermined value, when the note data detecting means is followed by a state of not detecting a note-on data, configured to stop the operation of the transmission unit It is characterized by having been done.

[0008]

According to the MIDI signal transmitting / receiving apparatus of the first aspect, for example, when the MIDI signal transmitting / receiving apparatuses are respectively connected to two MIDI musical instruments having a sound source apparatus as a MIDI musical instrument, the two MIDI musical instruments are connected to each other. MI
The sound generation of the tone generator of the DI musical instrument can be controlled. That is, in one MIDI musical instrument, the transmitting and receiving switching unit operates the transmitting unit, and in the other MIDI musical instrument, the transmitting and receiving switching unit operates the receiving unit. In this state, one MI
When the MIDI signal is output from the DI instrument, the transmitting unit
The high-frequency signal is modulated based on the IDI signal, and the modulated wireless signal is transmitted. Then, the receiving section of the other MIDI instrument receives the wireless signal, and converts the received wireless signal into an M signal.
The IDI signal is demodulated and output to the sound source device. The tone generation of this tone generator is controlled based on the input MIDI signal. Therefore, it is possible to transmit a MIDI signal between two MIDI musical instruments without using a MIDI cable.

[0009] Also, from the connected MIDI musical instrument, MID
When the signal detector detects that the I signal has been output
Indicates that the MIDI signal output section is activated and
The part activates the transmitting part, and the demodulated MIDI signal is received from the receiving part.
When the signal detector detects that the
The signal switching unit keeps the receiving unit in the operating state and the demodulation M
The IDI signal output is activated. In other words, the transmitting / receiving device
According to the detection result of the signal detection unit, the input M
The IDI signal is transmitted to a connected MIDI instrument or other MIDI
Since the signal is output or transmitted to the DI musical instrument, the switching operation between the transmitting unit and the receiving unit is not required.

According to the MIDI signal transmitting / receiving apparatus of the present invention, the note data writing means writes the note-on data of the MIDI data based on the MIDI signal output from the MIDI musical instrument to the memory and writes the note-on data to the memory. MIDI corresponding to recorded note-on data
When note-off data is input, the note-on data is deleted. On the other hand, the transmission / reception switching means stops the operation of the transmission unit and activates the reception unit when the note data detection unit detects that the note-on data is not written in the memory. That is, when there is no more MIDI data to be transmitted by the transmitting unit, the receiving unit automatically performs the reception of the radio signal, thereby
Input of MIDI signals from DI musical instruments and other MIDs
Both of the reception of the MIDI signal from the I musical instrument can be performed automatically.

According to the third aspect of the present invention, when the note data detecting means detects that the note-on data is not written in the memory, the counter starts counting. And the transmission / reception switching unit,
If the state where the note data detection unit does not detect the note-on data continues until the count value of the counter reaches a predetermined value, the operation of the transmission unit is stopped. Therefore, MIDI
Even if the musical instrument resumes outputting the MIDI signal immediately, the transmitting section does not immediately terminate the transmission of the MIDI signal and reliably transmits all the MIDI signals output from the MIDI musical instrument. Can be.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a MIDI signal transmitting / receiving apparatus according to an embodiment of the present invention.

FIG. 1 is a configuration diagram of a MIDI musical instrument system 1 to which a MIDI signal transmitting / receiving apparatus according to the present embodiment is applied. As shown in FIG.
Are four keyboards (MIDI instruments) 2a, 2b, 2
c, 2d (hereinafter, when the keyboard is not distinguished,
"Keyboard 2"). Each keyboard 2 is a sound source device (MIDI instrument, not shown)
And a transmitting / receiving device 3. Each transmitting / receiving device 3 is provided with an antenna 4 for transmitting / receiving a radio signal.

In the MIDI musical instrument system 1, each keyboard 2 is configured to transmit a radio signal to another plurality of keyboards 2 to control the sounding of the plurality of keyboards 2. As a result, it is possible to give an ensemble effect to the performance, or to set a different timbre or tone quality for each keyboard 2 in advance, and play the desired keyboard 2. Specifically, as shown in the figure, the transmission frequency of the radio signal transmitted by the keyboard 2a is set to f1 (Ch. 1), and the reception frequency of the radio signal received by the keyboards 2b and 2c is set to f.
1 (Ch. 1), if a performance is performed on the keyboard 2a, the keyboard 2a transmits a wireless signal modulated based on the MIDI signal and the keyboard 2a.
b and 2c receive the radio signal and demodulate it into a MIDI signal, and generate a sound based on the demodulated MIDI signal. Also, by setting the transmission frequency of the keyboard 2d and the reception frequency of the keyboard 2c to f2 (Ch. 2), the keyboard 2a becomes the keyboard 2b.
, And the keyboard 2d can separately control the sound emission of the keyboard 2c.

The tone generator described above generates a tone corresponding to a key press of the keyboard 2 in which the tone generator is built, and a tone corresponding to a MIDI signal transmitted from another keyboard 2. The transmission / reception device 3 can be set to be switched to either the transmission mode or the reception mode. In the transmission mode, the transmission / reception device 3 corresponds to a performance signal such as a note-on signal or a note-off signal output from the keyboard 2. While transmitting the radio signal modulated by the MIDI signal to the other keyboard 2, the reception mode receives the radio signal transmitted from the other keyboard 2 and demodulates the MIDI signal from the received radio signal.

Next, the configuration of the transmission / reception device 3 will be described with reference to the block diagram of the transmission / reception device 3 shown in FIG.
As shown in FIG. 1, the transmission / reception device 3 includes a CPU 11, a control data storage unit 12, a switch unit 13, a MIDI data reception unit 14, a transmission data temporary storage unit 15, a control signal output unit 16, a transmission data output unit 17, It comprises a unit 18, a reception data input unit 19, a MIDI data transmission unit 20, and an assigner (memory) 21.

The CPU 11 controls all operations of the transmission / reception device 3.
Detection of switch ON / OFF, input / output control of a MIDI signal transmitted / received to / from the keyboard 2 (including a function as a signal detection unit), and M based on the input MIDI signal.
Writing and reading of IDI data to and from the transmission data temporary storage unit 15, writing, erasing, and detection of MIDI data to and from the assigner 21 (note data writing means and note data detection means), and transmission and reception to the transmission / reception unit 18 It performs switching control (function as a transmission / reception switching unit), transmission / reception frequency control, transmission / reception data transmission control, and the like.

The control data storage unit 12 stores the operation program of the CPU 11 and the transmission / reception unit 1 having a plurality of channels.
8, transmission and reception channel frequency control data for each channel number.

The switch unit 13 includes a transmission mode switch,
A reception mode switch, an automatic switching mode switch, a performance mode switch, and a channel switch (all not shown) are provided.

The transmission mode switch and the reception mode switch are switches for setting the transmission / reception device 3 to a transmission mode (transmission state) and a reception mode (reception state), respectively, and when either switch is turned on. Then, the transmission / reception device 3 enters the manual mode. The automatic switching mode switch is a switch for setting the transmission / reception device 3 to the automatic switching mode. In the automatic switching mode, the transmission / reception device 3 is automatically switched to the transmission mode or the reception mode. Note that the transmission mode switch and the reception mode switch are adapted to be applied in preference to the automatic switching mode switch. Even when the automatic switching mode switch is turned on and the automatic switching mode is set, When the transmission mode switch or the reception mode switch is turned on, the transmission / reception device 3 is preferentially set to the manual mode and enters the transmission mode or the reception mode. The performance mode switch disconnects the transmitting / receiving unit 18 from the keyboard 2 and switches the keyboard 2 to a single MIDI
This switch is turned on when operating as a musical instrument, and is applied preferentially to the above three switches.

The channel switch is used to select a transmission / reception channel (Ch.) Of the transmission / reception unit 18 from a plurality of channels.

The MIDI data receiving section 14 is an interface circuit, and converts a MIDI signal of serial data output from the keyboard 2 into a parallel MIDI signal.

The transmission data temporary storage unit 15 stores a so-called F
When the transmission / reception device 3 is in the transmission mode, the MIDI data output from the keyboard 2 via the MIDI data receiving unit 14 is stored in the transmission data temporary storage unit 15. Are written sequentially. The written MIDI data is stored in the CPU
The data is read out in the order of writing by 11 and transmitted to another keyboard 2 by a radio signal from the transmission / reception unit 18. On the other hand, when the transmission / reception device 3 is in the reception mode, the transmission / reception unit 18
The MIDI data transmitted from the other keyboard 2 via the received data input unit 19 is sequentially written in the transmission data temporary storage unit 15 in the same manner. MI written
The DI data is read by the CPU 11 in the order of writing, and is output from the MIDI data transmitting unit 20 to the keyboard 2. In the transmission data temporary storage unit 15, the address of the FIFO to which the MIDI data is to be written next is indicated by the write pointer, and the address of the FIFO of the MIDI data to be read next is indicated by the read pointer. When no MIDI data is written in the FIFO, the CPU 11 sets a built-in FIFO empty flag.

The control signal output section 16 outputs a transmission control signal (press signal), transmission channel control data, and reception channel control data output from the CPU 11 to the transmission / reception section 18.

The transmission data output section 17 converts a parallel MIDI signal based on MIDI data read from the transmission data temporary storage section 15 into a serial MIDI signal.

The transmission / reception section 18 includes a transmission section for transmitting a radio signal and a reception section for receiving a radio signal. The transmitting unit frequency-modulates a high-frequency signal (modulated signal) based on the MIDI signal input to the transmitting / receiving device 3 to generate a radio signal and output the radio signal from the antenna 4. The receiving unit receives a wireless signal transmitted from another keyboard 2 via the antenna 4, demodulates the wireless signal into a MIDI signal, and outputs the MIDI signal to the received data input unit 19.

The reception data input section 19 converts a serial MIDI signal output from the reception section of the transmission / reception section 18 into a parallel MIDI signal.

The MIDI data transmitting section 20 converts a parallel MIDI signal based on the MIDI data read from the transmission data temporary storage section 15 into a serial MIDI signal, and outputs the serial MIDI signal to the keyboard 2.

The assigner 21 is a memory and has an MID
On / off states are stored for all note numbers for all MIDI channels input to the I data receiving unit 14 and the received data input unit 19. For this reason, all keys of the MIDI channel are associated in advance with a storage area determined by the address value and the bit value of the assigner 21, and the note-on data of a certain key number is stored in the MIDI data receiving unit 14 or the received data receiving unit. When input to the transmission / reception device 3 via the unit 19, C
The PU 11 writes data “1” into a predetermined storage area of the assigner 21.

Next, the configuration of the transmission / reception unit 18 will be described with reference to FIG.

The transceiver 18 is an FM transceiver,
The transmission and reception frequency is 430MHz band, the transmission output is 10mW,
The transmission / reception channels are constituted by 40 channels, and include a low-pass filter 31, an antenna switch 32, a reception unit 33, a transmission unit 34, and a first local oscillation unit 35, as shown in FIG.

The low-pass filter 31 prevents interference waves from being received in the reception mode, and prevents unnecessary waves from being transmitted in the transmission mode. Antenna switch 32
Performs transmission / reception switching of the antenna 4. That is, via the low-pass filter 31 and the antenna switch 32,
The antenna 4 is connected to the receiving unit 33 in the receiving mode, and to the transmitting unit 34 in the transmitting mode.

The receiving unit 33 includes a receiving RF amplifier 36, a first
It comprises a mixer 37, a first IF filter 38, a first IF amplifier 39, a receiving IC 40, a low-pass filter 41, and a comparator 42. The reception RF amplifier 36 amplifies the input radio signal with a predetermined gain. The first mixer 37 transmits a radio signal and a VC (described later).
An intermediate frequency signal (IF signal) is generated by mixing the first local oscillation signal from the O (Variable Voltage Control) 44 with the first local oscillation signal. The first IF filter 38 is constituted by a crystal filter, and improves the selectivity of the reception IF circuit. The first IF amplifier 39 amplifies the IF signal with a predetermined gain.
The receiving IC 40 uses the built-in second IF filter to
In addition to improving circuit selectivity, the built-in amplifier
After amplifying the F signal, the second local oscillation signal of the built-in second local oscillation section is mixed with the IF signal and demodulated to a low frequency signal by quadrature detection. Low-pass filter 41
Filters the low-frequency signal output from the receiving IC 40, and the comparator 42 shapes the waveform of the filtered low-frequency signal to generate a MIDI signal.

The transmitting section 34 constitutes a low-pass filter 43 for limiting the frequency bandwidth of a MIDI signal as a transmission data signal output from the transmission data output section 17 and a first local oscillation section 35 and functions as a modulation section. VC to do
An O44 and a transmission RF amplifier 45 for amplifying a wireless signal modulated by the VCO 44 are provided.

The first local oscillator 35 is commonly used as a channel oscillator of the receiver 33 and the transmitter 34, and includes the VCO 44 and the VCO 44 described above for the transmitter.
(Phse Locked Loop) IC4 for controlling oscillation
6 and a loop filter 47 for smoothing the oscillation control voltage output from the PLL IC 46. P
The LL IC 46 causes the VCO 44 to oscillate at a channel frequency during transmission and during reception based on the transmission channel control signal and the reception channel control signal output from the control signal output unit 16.

Next, an outline of the operation of the transmitting / receiving device 3 will be described.
The automatic switching mode and the manual mode will be described separately.

In the automatic switching mode, normally, the transmitting / receiving device 3
By setting the reception mode including the transmission / reception unit 18, input of a MIDI signal from the keyboard 2 via the MIDI data reception unit 14 and MIDI from another keyboard 2 via the transmission / reception unit 18 All of the signal inputs are in a standby state in which they can be accepted. In this standby state, when a MIDI signal is input from the keyboard 2 via the MIDI data receiving unit 14, the entire transmitting / receiving device 3 including the transmitting / receiving unit 18 is automatically set to the transmission mode.
The input MIDI signal is transmitted to another keyboard 2 via the transmission data output unit 17 and the transmission / reception unit 18. On the other hand, when a MIDI signal is input from another keyboard 2 via the transmission / reception unit 18 and the reception data input unit 19, the entire transmission / reception device 3 including the transmission / reception unit 18 is automatically set to the reception mode and input. MIDI signal to MIDI
The data is output to the keyboard 2 via the data transmission unit 20.

In the manual mode, either the transmission mode or the reception mode can be selected. That is, in the manual mode, the keyboard 2 can be fixed to either the performance device or the tone generator. When the transmission mode switch is turned on in the manual mode, the transmission / reception device 3 is set to the transmission mode. After that, when a MIDI signal is output from the keyboard 2 via the MIDI data reception unit 14, the transmission data output unit A MIDI signal is transmitted to another keyboard 2 via the transmission / reception unit 17. On the other hand, when the reception mode switch is turned on, the transmission / reception device 3 is set to the reception mode, and thereafter, when a MIDI signal is input from another keyboard 2 via the transmission / reception unit 18 and the reception data input unit 19. , Entered M
The IDI signal is output to the keyboard 2 via the MIDI data transmission unit 20.

Next, the operation of the transmitting / receiving device 3 will be specifically described with reference to the flowcharts of FIGS.
The processes described below are all performed by the CPU 11 unless otherwise specified. In addition, the following various flags are used in these processes. These flags in the left column respectively indicate that the transmission / reception device 3 is in the state in the right column when set by the CPU 11. Transmission / reception flag: Transmission mode state Automatic switching mode flag: Automatic switching mode state FIFO empty flag: State in which FIFO storage data is empty Switchable flag: State immediately after the automatic switching mode
Or, in the automatic switching mode, a standby state from the end of reception or transmission to the start of the next transmission or reception

First, the main routine shown in FIG. 4 will be described.

The main routine is a routine that is always repeated. In this routine, first, it is checked whether a transmission / reception flag is set (step S1). When the transmission / reception flag is set, that is, when the transmission mode switch is turned on in the manual mode, or when the transmission mode is set in the automatic switching mode, the transmission data output process described below is performed ( Step S2) If it is not set, that is, if the transmission switch is not pressed in the manual mode, or if the transmission mode is not in the automatic switching mode, MIDI described later is used.
A data output process is performed (Step S3).

After performing either of the processes, it is checked whether or not the automatic switching mode flag is set (step S4). If the automatic switching mode flag is set, that is, if the transmitting / receiving device 3 is in the automatic switching mode, after performing an assigner writing process (step S5) and an assigner check process described later (step S6). , Returning to step S1, and repeating the main routine again. If the automatic switching mode flag is not set in step S4, that is, if the mode is the manual mode, the process returns to step S1 and the main routine is repeated again.

Next, the transmission data output process (step S2) in step S2 will be described with reference to FIG. This process is a process for transmitting MIDI data sent from the keyboard 2 to another keyboard 2. First, it is checked whether the FIFO empty flag is set (step S11). F
If the IFO empty flag is set, that is, if the MIDI data stored in the FIFO is empty, this routine ends and returns to the main routine.

In step S11, if the FIFO empty flag is not set, that is, if the FIFO
When the MIDI data is stored in O, the read pointer value of the FIFO is read (step S12), and the MIDI data stored at the FIFO address indicated by the read pointer value is read (step S13).
Next, the read MIDI data is transmitted to the transmission data output unit 1.
7 (step S14), and updates the value of the read pointer (step S15). Next, it is checked whether or not the updated value matches the write pointer value (step S16). If they match, it is determined that no MIDI data remains in the FIFO, and
The O empty flag is set (step S17)
Then, the process returns to the main routine. If they do not match, it is determined that the MIDI data remains in the FIFO, and the process returns to the main routine without setting the FIFO empty flag (step S16).

Next, the MIDI of the aforementioned main routine is executed.
FIG. 5B shows the data output process (step S3).
This will be described with reference to FIG. This process is a process of outputting MIDI data transmitted from another keyboard 2 to the keyboard 2. This processing is substantially the same as the above-described transmission data output processing, and differs from the transmission data output processing in that the MIDI data read from the FIFO in step S14 of the transmission data output processing is not transmitted to the transmission data output unit 17 but to the transmission data output unit 17. The output is to the MIDI data transmission unit 20. In other words, in this process, the read MIDI data is output to the MIDI data transmission unit 20 (step S18), so that M
An IDI signal is output.

Next, the automatic switching mode setting routine will be described with reference to FIG. This routine is a process for setting the transmission / reception device 3 to the automatic switching mode by an interrupt process when the automatic switching mode switch is pressed, and sets or resets all the flags other than the FIFO empty flag to a predetermined state. I do.

First, the channel number designated by the channel switch is read (step S2).
1), reception channel control data corresponding to this channel number (first VCO 44 in the reception mode)
Local oscillation frequency data) is read from the control data storage unit 12 (step S22). Next, a reception channel control signal based on the read reception channel control data is output to the transmission / reception unit 18 via the control signal output unit 16 (step S23). In this state, the reception data input unit 19 can input the reception data, and the reception interruption of the reception data input unit from the reception data input unit 19 is permitted (step S24).

In this state, the MIDI data receiving unit 14 can receive MIDI data.
The MIDI data receiving unit reception interrupt from the IDI data receiving unit 14 is also permitted (step S25).

Next, the transmission / reception flag is reset (step S26), the transmission / reception device 3 is set to the reception mode, and the automatic switching mode flag is set (step S2).
7) and setting of a switchable flag (step S2)
Perform 8). Thus, the automatic switching mode setting routine ends, and the process returns to the main routine.

Next, the reception interruption processing of the reception data input unit and M which are permitted in the automatic switching mode setting routine are performed.
FIGS. 7 and 8 show the IDI data input unit reception interrupt processing.
This will be described with reference to FIG. Note that these interrupt processes are also performed in a reception switching process and a transmission switching process (see FIGS. 14A and 14B) described later in the manual mode.

First, the reception interrupt processing of the reception data input section will be described. This process is performed in the reception mode.
When a MIDI signal is input from another keyboard 2 via the transmission / reception unit 18 and the reception data input unit 19, the M
This is a process for automatically outputting the IDI signal to the keyboard 2. In this process, first, it is checked whether or not the switchable flag is set (step S3).
1). If the switchable flag is set, that is,
When the transmission / reception device 3 is in the standby state, the reception of the MIDI data reception unit 14 is stopped (step S32), and the switchable flag is reset (step S33). After this reset, or when the switchable flag has not been set in step S31, that is, when the reception data input unit interrupt has already been performed, the write pointer value of the FIFO is read (step S34), and the write is performed. The MIDI data input via the reception data input unit 19 is written to the FIFO address indicated by the pointer value (step S35). Next, after updating the write pointer value (step S36), the FIFO empty flag is reset (step S37). As described above, the reception interrupt processing of the reception data input unit is completed, and the process returns to the main routine.

Next, the MIDI data receiving section reception interrupt processing will be described with reference to FIG. This processing is performed when a MIDI signal is input from the keyboard 2 via the MIDI data receiving unit 14 in the transmission mode.
This is a process for automatically transmitting an IDI signal to another keyboard 2. In this process, first, it is checked whether or not the switchable flag is set (step S).
41). If set, that is, the transmitting / receiving device 3
Is in the standby state, the channel number designated by the channel switch is read (step S
42), the transmission channel control data corresponding to the channel number (the first local oscillation frequency data of the VCO 44 in the transmission mode) is read from the control data storage unit 12 (step S43). Next, a transmission channel control signal based on the read transmission channel control data is output to the transmission / reception unit 18 via the control signal output unit 16 (step S44), and the transmission control signal is transmitted / received via the control signal output unit 16. Output to the unit 18 (step S45). Thereafter, the transmission / reception flag is set (step S46), the reception of the reception data input unit 19 is stopped (step S47), and the switchable flag is reset (step S48).

After resetting this flag, or when the switchable flag has not been set in step S41, that is, when the MIDI data receiving section reception interrupt has already been performed, the FIFO write pointer value is read. (Step S49), the MIDI data input via the MIDI data receiving unit 14 is written to the address of the FIFO indicated by the write pointer value (Step S50). Next, the write pointer value is updated (step S51), and the FIFO empty flag is reset (step S52). As described above, the MIDI data receiving section reception interrupt processing is completed, and the process returns to the main routine.

As described above, it is possible to detect which of the other keyboard 2 and the keyboard 2 has output the MIDI data by performing the reception data input section reception interrupt and the MIDI data reception section reception interrupt processing. According to the detection result, the entered M
Since the MIDI data based on the IDI signal is output to the keyboard 2 or transmitted to another keyboard 2, the receiving unit 3
3 and the switching operation of the transmission unit 34 become unnecessary.

In steps S35 and S50 described above, the MIDI data is once written in the FIFO, so that the transmission speed of the MIDI signal output from the keyboard 2 does not match the transmission speed of the data transmitted by the transmission unit 34. Or the transmission speed of the MIDI signal transmitted from the other keyboard 2 and the MIDI data transmission unit 2
Even when 0 does not match the transmission speed of the MIDI signal output to the keyboard 2, the FIFO plays the role of a buffer and can adjust the difference in the transmission speed.

Next, the assigner writing process (step S5) of the main routine will be described with reference to FIGS. This processing is performed on all the MI
This is the process of writing the key-on key data of the DI channel into the assigner 21. The transmission data output process (step S2) or the MIDI data output process (step S3) is performed on one byte of the MIDI data based on the MIDI signal. Will be executed after

First, the MIDI data input via the MIDI data receiving unit 14 or the received data input unit 19
It is checked whether the MSB (Most Significant bit) of the DI data is “H”, that is, “1” (step S61). If it is not “H” (if the MIDI data is a data byte), the routine of A (FIG. 1)
Go to 0) and if "H" (status byte)
In step S62, it is checked whether the upper 4 bits of the MIDI data are "9n", that is, whether the upper 4 bits are "1001". In the case of "9n", the note-on status is determined, the MIDI channel number is stored (step S63), the note-on status flag is set (step S64), and the note-off status flag is reset (step S64). S65),
Prevent both the note-on status flag and the note-off status flag from being set at the same time, and then return to the main routine.

In step S62 described above, “9
If it is not "n", it is "8n", that is, "1000"
Is checked (step S66). "8
n ”, that is, in the case of the note-off status, the MIDI channel number is stored (step S
67) The note-off status flag is set (step S68), and the note-on status flag is reset (step S69). Also in this case, the process returns to the main routine after both flags are not set at the same time. Step S66 described above
If the flag is not "8n", it is neither the note-on status nor the note-off status, so the note-on status flag and the note-off status flag are reset (step S70), and the process returns to the main routine.

Next, the processing when the MSB is not "H" in step S61 described above will be described with reference to Fig. 10.
Performed when the data is a data byte. First, it is checked whether or not the note-on status flag has been set, that is, whether or not the note-on status flag has been set in step S64 described above (step S71).

If it is determined that the MIDI data has not been set, that is, if the input MIDI data is not note-on data, the routine proceeds to a routine B (see FIG. 11) shown in FIG. If it is determined that the second byte flag is set, it is checked whether the second byte flag is set (step S72). That is, it checks whether or not the input MIDI data is the second byte data. If the second byte flag is not set, that is, if it is the second byte of MIDI data, the note number is stored (step S73).
The second byte flag is set (step S74). Next, the MID stored in step S63 described above.
An address value and a bit value of the assigner 21 are created from the I channel number and the note number stored in the step S73 (step S75), and the created address value and the bit value are stored (step S7).
6). As a result, it is possible to check which key of which MIDI channel is the data of the third byte to be input next.

On the other hand, in step S72 described above,
If the second byte flag is set, that is, if it is determined that the MIDI data is the third byte of the input MIDI data, the address value and the bit value of the assigner 21 are read (step S77). Next, it is determined whether or not the data is "00 (volume 0)", that is, whether or not the note is off (step S78). If it is not "00", the bit (storage area) of the corresponding assigner 21 is set, that is, "1" is written to make it a note-on state (step S79). If it is "00", the corresponding bit of the assigner 21 is reset, that is, "0" is written to set the note-off state (step S80).
Next, the second byte flag is reset (step S
81) Then, return to the main routine.

Next, in step S71 described above,
The process when the note-on status flag is not set, that is, when the input MIDI data is not the note-on data, will be described with reference to FIG. If data that is not note-on is input, it is checked whether a note-off status flag is set (step S91). If the note-off status flag is not set, that is, it is determined that data that is neither note-on data nor note-off data, that is, performance data that is not note data, has been input, and returns to the main routine (step S91). .

Next, it is checked whether or not the second byte flag is set (step S92). If the second byte flag is not set, the note number is stored (step S93), and the second byte flag is set (step S94). Next, an address value and a bit value of the assigner 21 are created from the MIDI channel number stored in the above-described step S63 and the note number stored in the step S93 (step S95), and the created address value and the bit value are stored (step S95). S96). As a result, the third byte data to be input next is determined by which MID
It is possible to check which key of the I channel the data is for.

If it is determined in step S92 that the second byte flag is set, the assigner address value and the bit value are read (step S9).
7) The corresponding bit of the assigner 21 is reset ("0" is written) (step S98), and the second byte flag is reset (step S99). That is, here, the processing is performed on the assumption that the note-on key has been turned off. Thus, the assigner process ends, and the process returns to the main routine.

Next, the assigner check process (step S6) in the main routine will be described with reference to FIG.

When the assigner writing process (step S5) is completed, it is checked whether all the data in the assigner 21 is "0" (step S101). This check is performed on the MIDI data input via the MIDI data receiving unit 14.
As a result of transmitting all of the DI data or the MIDI data received via the reception data input unit 19 to the keyboard 2 via the MIDI data transmission unit 20 or to another keyboard 2 via the transmission / reception unit 18, respectively, To determine whether or not all keys of the MIDI channel are turned off. If all the data in the assigner 21 is “0”, the CP
The time counting by the internal timer of U11 is started (step S102). When this count value reaches a predetermined number (after a predetermined time, for example, 1 to 2 seconds),
A timer interrupt described later is performed.

Next, referring to FIG. 13, a description will be given, with reference to FIG. 13, of a timer interrupt process performed when the timer times out in step S102 of the assigner check process described above.

This timer interrupt processing is performed in the automatic switching mode in the reception interrupt of the reception data input section or the MID.
This is a process of resetting to the initial state of the automatic switching mode after any of the I data receiving unit reception interrupts has occurred and the process has been completed. In other words, MIDI is assigned to the assigner 21
If the data has not been stored for a predetermined period of time,
This is a process for setting the transmission / reception device 3 to a state where both the reception interrupt processing of the reception data input unit and the reception interruption process of the MIDI data reception unit can be performed.

In this process, it is checked whether the transmission / reception flag is set (step S111). If it is set, the output of the transmission control signal is turned off (step S112), that is, the transmission / reception unit 18 is set to the reception state, and then the channel number designated by the channel switch is read (step S11).
3) Read out the reception channel control data corresponding to the channel number from the control data storage unit 12 (step S114). Next, the read reception channel control data is output to the transmission / reception unit 18 via the control signal output unit 16 (step S115). Thereafter, the transmission / reception flag is reset (step S116), the reception data input unit is set to a receivable state (step S116), and the reception interruption of the reception data input unit is permitted (step S117).
Next, the timer stops counting in the timer count process (step S102) in the assigner check process (step S6), and the count value is initialized (step S119).

If the transmission / reception flag is not set in step S111, that is, if the MIDI
If the data receiving unit is already in a receivable state, a MIDI data receiving unit reception interrupt is permitted (step S121). Next, as in step S118, the timer is stopped, the count value is initialized (step S122), and a switchable flag is set (step S123). As described above, the timer interrupt process ends, and the process returns to the main routine.

As described above, in this timer interrupt processing, when it is detected that the note-on data is not stored in the assigner 21, the operation of the transmitting section 34 is stopped (the transmission mode is released) and the receiving section 33 is released. Is set to the operation state (setting of the reception mode, step S112), the reception interrupt of the reception data portion is permitted (step S117), and the MID is set.
Permission of I data receiving section reception interrupt (step S121)
I do. This automatically causes the keyboard 2 to send the MI
A DI signal can be input, and this MIDI signal can be transmitted to another keyboard 2 via the transmission unit 34, and the reception unit 33
Can be output to the keyboard 2.

Further, by performing the timer count process, when all the data in the assigner 21 becomes "0", the keyboard 2 or another keyboard 2 is set to the MI.
Even if the output of DI data is restarted immediately, it is possible to have a margin in time, and the MIDI output from the keyboard 2
All of the signals and the MIDI signals transmitted from the other keyboard 2 can be reliably transmitted to the other keyboard 2 and the keyboard 2 respectively.

Next, the reception switching process and the transmission switching process in the manual mode will be described with reference to FIG.
This will be described with reference to FIG.

First, the reception switching process will be described with reference to FIG.
This will be described with reference to FIG. In this processing, the setting is changed to the manual mode by turning off the automatic switching mode switch, and the receiving mode is set by turning on the receiving mode switch.
Is used exclusively as a sound source device, that is, a process performed when the transmission / reception device 3 is set to play the keyboard 2 based on a MIDI signal from another keyboard 2.

In this process, when the reception mode switch is first detected to be on, the output of the transmission control signal is turned off (step S131), the transmission / reception unit 18 is set to the reception state, and the channel switch is designated. Read the channel number (step S132),
The reception channel control data corresponding to the channel number is read from the control data storage unit 12 (step S
133). Next, a reception channel control signal based on the read reception channel control data is sent to the control signal output unit 1.
6 to the transmission / reception unit 18 (step S13).
4). Next, the transmission / reception flag is reset (step S135), and the reception of the transmission / reception unit 18 is enabled.
The reception of the MIDI data receiving unit 14 is stopped (step S136). In this state, only the reception of the reception data input unit is enabled, and the reception interruption of the reception data input unit is permitted (step S137). Next, the automatic switching mode flag is reset (step S138), the mode is set to the manual mode, and the switchable flag is also reset (step S139), and the process returns to the main routine.

Next, the transmission switching process will be described with reference to FIG.
To explain with reference to (b), in this processing, the setting is changed to the manual mode by turning off the automatic switching mode switch, and the transmission mode is set by turning on the transmission mode switch. This is a process for setting the transmission / reception device 3 to a predetermined state when the keyboard 2 performs a performance based on the MIDI signal from the keyboard 2. This process is almost the same as the above-described reception switching process, and differs from the transmission / reception unit 1.
8 is set in the transmission state instead of the reception state. That is, the difference is that the transmission control signal is output via the control signal output unit 16.

The transmission switching process will be described. The channel number is read (step S141), the corresponding transmission channel control data is read (step S142), and a transmission channel control signal based on the data is output to the transmission / reception unit 18 (step S142). S143). Thereafter, a transmission / reception flag is set (step S144).
At the same time, a transmission control signal is output (step S14).
5), the reception of the reception data input unit 19 is stopped (step S146). In this state, the MIDI data receiving unit 1
4 is enabled, and a MIDI data receiving unit reception interrupt is permitted (step S147). Next, the automatic switching mode flag is reset (step S
148), the switchable flag is reset (step S149). Thus, the transmission switching process ends.

As described above, in the manual mode, the operation of the transmission / reception device 3 can be easily set to one of the transmission mode and the reception mode by switching the transmission mode switch and the reception mode switch. Therefore, the keyboard 2 is connected to a single performance MID.
It can be used as an I musical instrument, used as a sound source device controlled by another keyboard 2, or used as a sound control device for controlling the sound generation of the sound source device of another keyboard 2. In this case, the troublesome work of reconnecting the MIDI cable and the transmission / reception device 3 is completely unnecessary.

Next, the transmission channel update processing and the reception channel update processing will be described with reference to FIGS. The two-channel updating process is executed by interruption when the channel switch is pressed.

First, the transmission channel update processing will be described with reference to FIG. When the transmission channel number is updated from N1 to N2 (step S15)
1), the transmission channel control data corresponding to the transmission channel N2 is read from the control data storage unit 12 (step S152). Next, a transmission channel control signal based on the read transmission channel control data is output to the transmission / reception unit 18 via the control signal output unit 16 (step S153). As a result, the first local oscillation frequency of the transmitting / receiving section 18 is set, and the apparatus enters a transmission preparation state. As described above, this process ends, and the process returns to the main routine.

Next, regarding the reception channel update processing,
This will be described with reference to FIG. This process is different from the transmission channel update process in the reception mode.
The point is that the receiving channel control data specified by the channel switch is output. When the reception channel number is changed from N1 to N2 (step S161),
The reception channel control data corresponding to the reception channel N2 is read (step S162), and the reception channel control signal is output to the transmission / reception unit 18. As described above, the first local oscillation frequency of the transmission / reception unit 18 in the reception mode is set, and this process ends and the process returns to the main routine.

As described above, the transmission frequency and the reception frequency of the keyboard 2 can be arbitrarily set by the transmission channel update processing and the reception channel update processing. , And as a result, it is possible to form a varied playing system.

As described above, according to the present embodiment, the MID
By transmitting a MIDI signal from the keyboard 2 to another keyboard 2 without using an I cable, the other keyboard 2 can be operated as a sound source device. Conversely, the MI transmitted from the other keyboard 2
The keyboard 2 can be operated as a sound source device based on the DI signal.

The transmitting / receiving section 18 of the embodiment may be configured to be able to transmit / receive by infrared rays.

In this embodiment, the assigner 21 is used as a memory for storing the note-on data. However, the present invention is not limited to this. For example, a rewritable general memory such as a RAM or an EEPROM (Electrically Era) is used.
sable PROM). Regarding the storage contents, the note number data and the note-on data of the MIDI data may be stored as they are, or the converted data may be stored.

In this embodiment, the keyboard 2
Although transmission and reception between the keyboard 2 and other keyboards 2 have been described, transmission and reception between all MIDI instruments such as a keyboard 2, a performance device such as a MIDI guitar, a tone generator, and a sequencer are possible. . The transmission / reception circuit 3 is installed in a performance information recording device such as a sequencer.
Is connected, the performance information recording device can receive a wireless signal transmitted from another MIDI musical instrument and record performance information based on a MIDI signal demodulated from the wireless signal.

In this embodiment, the transmission / reception unit 18
Is configured to transmit and receive a FM-modulated radio signal, but is not limited to this.
Of course, other modulation schemes such as off modulation, AM modulation, PM modulation, and pulse modulation may be used. Further, in the present embodiment, the transmission / reception unit 18 is configured to be capable of simplex transmission / reception. May be.

[0088]

As described above, according to the transmitting / receiving apparatus of the present invention, the transmitting unit transmits a radio signal modulated based on a MIDI signal output from a MIDI musical instrument, and receives and receives a radio signal. By demodulating a MIDI signal from a wireless signal and outputting the demodulated MIDI signal to a connected MIDI instrument, the MIDI signal can be transmitted between a plurality of MIDI instruments without using a MIDI cable. The signal detection unit detects input and reception of MIDI signals from both the connected MIDI instrument and the other MIDI instrument, so that the other MIDI instrument or the connected MID is automatically detected.
Since the MIDI signal is transmitted or output to the I musical instrument, the switching operation between the transmission unit and the reception unit is not required.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a transmission / reception device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a transmitting / receiving apparatus according to an embodiment of the present invention.

FIG. 3 is a block diagram of a transmission / reception unit of the transmission / reception device according to the embodiment of the present invention.

FIG. 4 is a flowchart of a main routine.

FIG. 5 is a flowchart of a transmission data output process and a MIDI data output process.

FIG. 6 is a flowchart of an automatic switching mode setting process.

FIG. 7 is a flowchart of a reception interrupt process of a reception data input unit;

FIG. 8 is a flowchart of a MIDI data receiving unit reception interrupt process.

FIG. 9 is a flowchart of an assigner writing process.

FIG. 10 is a flowchart of an assigner writing process.

FIG. 11 is a flowchart of an assigner writing process. .

FIG. 12 is a flowchart of an assigner check process.

FIG. 13 is a flowchart of a timer interrupt.

FIG. 14 is a flowchart of a reception interruption process and a transmission interruption process.

FIG. 15 is a flowchart of a transmission channel update process and a reception channel update process.

[Description of Signs] 2 Keyboard 3 Transceiver 11 CPU 21 Assigner 33 Receiver 34 Transmitter

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Haruhiko Matsui 200 Terashimacho, Hamamatsu-shi, Shizuoka Kawai Musical Instruments Co., Ltd. (56) References JP-A-1-135137 (JP, A) JP-A-62 183630 (JP, A) JP-A-64-65932 (JP, A) JP-A-63-278426 (JP, A) JP-A-6-13931 (JP, A) JP-A-55-12969 (JP, A) JP-A-3-251896 (JP, A) JP-A-1-250998 (JP, A) JP-A-6-51760 (JP, A) JP-B-64-2719 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) G10H 1/00-1/46 H04B 1/38-1/58

Claims (3)

(57) [Claims] 1. A MIDI signal transmission / reception device connected to a MIDI musical instrument for transmitting a MIDI signal for transmitting performance information to another MIDI musical instrument, based on an input MIDI signal. A transmitting unit that modulates the high-frequency signal and transmits the modulated radio signal, and receives a radio signal that has been modulated with a high-frequency signal based on a MIDI signal output from the other MIDI instrument , and Demodulates the MIDI signal,
A receiver for outputting the demodulated MIDI signal; MIDI data based on a MIDI signal output from the connected MIDI musical instrument; and an output from the receiver.
Has been a transmission data temporary storage unit for storing the demodulated MIDI data based on the MIDI signal, the MIDI de stored in the transmission data temporary storage unit
Data based on the MIDI data.
MIDI signal output unit for outputting an IDI signal to the transmission unit
And the demodulated MID stored in the transmission data temporary storage unit.
I data and read the demodulated MIDI data
A connected MIDI musical instrument based on a demodulated MIDI signal
And a MIDI signal output section for outputting a MIDI signal from the connected MIDI musical instrument.
Whether or not the demodulated MIDI signal is received from the receiving unit.
Signal detector and the transmission section and either a reception switching unit for actuating the, of MIDI signals from the connected MIDI instrument output of the receiver unit for detecting whether or not No. is output
When the signal detection unit detects that the
When the IDI signal output unit operates, the transmission / reception switching unit
Activates the transmitting unit and outputs the demodulated MI from the receiving unit.
The signal detector detects that the DI signal has been output.
Sometimes, the transmission / reception switching unit activates the reception unit.
While the demodulated MIDI signal output section operates.
Transceiver of MIDI signals, characterized in that that. 2. A memory capable of writing note-on data of MIDI data based on a MIDI signal output from the connected MIDI instrument, and a note-on data of a MIDI signal output from the MIDI instrument. Note data writing means for writing to the memory and erasing the note-on data when MIDI note-off data corresponding to the written note-on data is input; note-on data written to the memory Note data detecting means for detecting presence / absence of data, wherein the transmission / reception switching unit operates the transmitting unit when the note data detecting means detects that the note-on data is not written in the memory. And to operate the receiving unit The MIDI signal transmitting / receiving apparatus according to claim 1, wherein: That wherein no note-on data is written into the memory upon detecting said note data detection means, further comprising a counter that starts counting, the transmission and reception switching unit, the note data detecting means Is
Check that the note-on data has not been written to the memory.
And when the state in which the note data detecting means does not detect note-on data continues until the count value of the counter reaches a predetermined value, the operation of the transmitting unit is stopped. 3. The MIDI signal transmitting / receiving apparatus according to claim 2, wherein: