JP2948101B2 - Transmitter and receiver for MIDI data - 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) used for transmitting performance information such as pitch information, velocity information, timbre information and control information.
Digital Interface) signal is transmitted to a performance device such as a keyboard or MIDI guitar, a sound source device, a sequencer or the like.
The present invention relates to a transmitter and a receiver for MIDI data transmitted or received between IDI musical instruments.

[0002]

2. Description of the Related Art As a MIDI data transmitting apparatus of this type, a transmitting section for transmitting a radio signal obtained by modulating a high-frequency signal based on MIDI data output from a keyboard (MIDI instrument) as a playing apparatus, and a transmitting section And a transmission control unit for controlling the transmission. Also, MI
As a DI data receiving device, a receiving unit that receives a radio signal transmitted by a MIDI data transmitting device and demodulates the received signal, and transmits MIDI data based on the demodulated signal to M
There is known an apparatus having a reception data output unit for outputting to an IDI musical instrument.

[0003] This conventional MIDI data transmitting apparatus is composed of:
When the keyboard outputs the MIDI data, the transmission control unit controls the transmission unit, and the transmission unit modulates the high-frequency signal based on the MIDI data and immediately transmits the modulated radio signal. On the other hand, in a conventional MIDI data receiving apparatus, a receiving unit receives a wireless signal transmitted by a transmitting apparatus, and a received data output unit immediately outputs the received MIDI data to a MIDI musical instrument, for example, a tone generator. On the other hand, the tone generator generates a musical tone based on the input MIDI data.

[0004]

However, such a conventional transmitting apparatus and receiving apparatus have the following problems. First, when transmitting MIDI data from a transmitting apparatus to a receiving apparatus by a wireless signal, reception control data such as paging name data of the receiving apparatus and reception frequency switching control data must be transmitted prior to transmission of the MIDI data. May not be. In such a case, if the receiving device immediately outputs the reception control data as MIDI data to the sound source device, there is a problem that the sound source device malfunctions.

[0005] The present invention has been made in view of the above problems, and can distinguish MIDI data from other data, and can provide MIDI data to a connected MIDI musical instrument.
It is an object of the present invention to provide a MIDI data transmitting device and a MIDI data transmitting device capable of preventing data other than data from being output.

[0006]

To achieve the above object, a MIDI data transmitting apparatus according to claim 1 is connected to a MIDI musical instrument for outputting MIDI data for transmitting performance information, and outputs the output MIDI data. , And this M
Reception control other than IDI data for controlling the reception device
A transmitting unit that modulates a high-frequency signal based on one of the control data and transmits a modulated radio signal to a receiving device, and a transmission control unit that controls start of transmission of the transmitting unit. A transmission data output unit that outputs the MIDI data and the reception control data to the transmission unit; and a transmission time measurement unit that measures a transmission time from the start of transmission of the transmission unit. The reception control data is output to the transmission unit until the predetermined time is reached, and the MIDI data is output to the transmission unit after the transmission time reaches the predetermined time.

[0007]

[0008] receiving device MIDI data according to claim 2, is connected to a MIDI musical instrument for processing performance data based on the MIDI data for transmitting performance information, transmission instrumentation
MIDI data and the MIDI data
Each based on one of the external reception control data
Modulated, in the order of reception control data and MIDI data
Receives transmitted radio signals in order and restores received signals.
And a receiver that adjusts the received data based on the demodulated signal.
And a reception data output unit for outputting reception data to a MIDI musical instrument. The reception device detects whether or not reception has been performed based on a received signal and / or a demodulated signal. Department and reception
A reception time measurement unit that measures a reception time from when the detection unit detects that reception has been performed, and a reception data output unit outputs the reception data until the reception time reaches a predetermined time.
Therefore, the receiving unit is controlled, and after the receiving time reaches a predetermined time.
And outputting the received data to a MIDI musical instrument.

[0009]

According to the MIDI data transmitting apparatus of the first aspect, the transmission control section controls the transmission section, and when the transmission section starts transmission, the transmission time measurement section measures the transmission time from the start of transmission. In this case, the transmission data output unit outputs the reception control data to the transmission unit until the transmission time reaches the predetermined time, and outputs the MIDI data to the transmission unit after the transmission time reaches the predetermined time. In other words, the radio signal modulated based on the MIDI data is transmitted to the receiving device only after a predetermined time has elapsed after the start of transmission. Therefore, by setting the reception device not to treat the reception data received within a predetermined time from the reception of the radio signal as MIDI data, data other than the MIDI data may be output to the sound source device or the like. Can be prevented. As a result, it is possible to prevent malfunction of the sound source device and the like on the receiving device side.

[0010]

According to the receiving apparatus of the MIDI data of claim 2, wherein, the receiving unit demodulates the received signal while receiving a radio signal, the reception data output unit based on the demodulated signal MI
The DI data is output to a MIDI instrument. In this case, when the reception detection unit detects the presence or absence of reception based on the reception signal and / or the demodulated signal, the reception time measurement unit measures the reception time since the reception detection unit detected the reception. On the other hand, the reception data output section outputs the reception data after the reception time reaches the predetermined time to the MIDI musical instrument as MIDI data. For this reason, it is possible to prevent data other than the MIDI data from being output to the tone generator or the like by setting not to treat the reception data within a predetermined time from the reception of the wireless signal as the MIDI data. . As a result,
It is possible to prevent malfunction of the sound source device and the like on the receiving device side.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to the accompanying drawings, a MIDI data transmitting and receiving apparatus according to an embodiment of the present invention will be described. ) Will be described.

FIG. 1 is a configuration diagram of the transmission / reception device 1. As shown in FIG. 1, a keyboard 3 and a sound source device 4 are connected to the transmitting / receiving device 1 via MIDI cables 2 and 2.
However, other keyboards 5 are connected via wireless lines. The keyboards 3 and 5 output or transmit various MIDI data including note-on data and note-off data to the transmission / reception device 1. Also, the sound source device 4
Generates a musical tone corresponding to MIDI data output from another keyboard 5 via the transmitting / receiving device 1.

Next, the configuration of the transmitting / receiving apparatus 1 will be described. As shown in FIG.
Control data storage unit 12, MIDI data input unit 13, M
An IDI data temporary storage unit 14, a control signal output unit 15, a transmission data output unit 16, a transmission / reception unit 17, a reception data input unit 18, and a MIDI data output unit 19 are provided.

A CPU (transmission time measurement unit, transmission data output unit, reception data output unit, reception time measurement unit) 11 controls all operations of the transmission / reception device 1. MIDI data input control,
It controls output of MIDI data to the sound source device 4, control of start / end of transmission / reception of the transmission / reception unit 17, transmission / reception switching control, channel control, and the like. In addition, a counter for measuring the time from the start of transmission or the detection of a carrier signal (reception detection signal) described later is provided internally,
After the counter has counted a predetermined value (predetermined time), M
IDI data transmission or MIDI data tone generator 4
Output to

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

The MIDI data input section 13 is an interface circuit, converts serial MIDI data output from the keyboard 3 into parallel MIDI data, and outputs the parallel MIDI data to the CPU 11.

The MIDI data temporary storage unit 14 is constituted by a so-called FIFO (First-in First-out) memory, and the keyboard 3 is transmitted via the MIDI data input unit 13.
, And the data transmitted from another keyboard 5 via the transmission / reception unit 17 are temporarily stored. Then, the stored MIDI data from the keyboard 3 is read out by the CPU 11 in the order of storage, and transmitted to another keyboard 5 via the transmission / reception unit 17. The data from the other keyboards 5 is transmitted to the CPU 1
1 and is read out in the order of storage, and when it is reception control data, the CPU 11 controls a later-described reception unit 33 according to the reception control data.

The control signal output unit 15 outputs the transmission / reception control signal, the transmission channel control signal, and the reception channel control signal output from the CPU 11 to the transmission / reception unit 17.

The transmission data output section 16 converts the parallel MIDI data read from the MIDI data temporary storage section 14 into serial MIDI data.

The receiving data input unit 18 converts serial MIDI data output from a receiving unit of the transmitting / receiving unit 17 described later into parallel MIDI data.

The MIDI data output unit 19 is connected to the CPU 11
Is converted to serial MIDI data and output to the tone generator 4.

Next, the configuration of the transmitting / receiving section 17 will be described with reference to FIG.

The transceiver 17 is an FM transceiver,
The transmission and reception frequency is 430MHz band, the transmission output is 10mW,
The transmission / reception channels are configured to 40 channels, and include an antenna 30, 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 reception of an interference wave in the reception mode, and prevents transmission of an unnecessary wave in the transmission mode. Antenna switch 32
Performs transmission / reception switching of the antenna 30. That is, the antenna 30 is connected to the receiving unit 33 in the receiving mode via the low-pass filter 31 and the antenna switch 32.
In the transmission mode, they are connected to the transmission unit 34, respectively.

The receiving section 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 (reception detecting unit) 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 to a VCO (Voltage Controlled Oscillator) described later.
) 44 to generate an intermediate frequency signal (IF signal) by mixing 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 improves the selectivity of the IF circuit by the built-in second IF filter, amplifies the IF signal by the built-in amplifier, and then mixes the second local oscillation signal of the built-in second local oscillation unit with the IF signal. , And demodulate to a low frequency signal by quadrature detection. The receiving IC 40 outputs a carrier signal obtained by detecting the IF signal to the CPU 11. Low-pass filter 4
1 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 MIDI data.

The transmission section 34 constitutes a low-pass filter 43 for limiting the frequency bandwidth of MIDI data as a transmission data signal output from the transmission data output section 17, and a first local oscillation section 35, and also functions as a modulation section. V
It has a CO 44 and a transmission RF amplifier 45 that amplifies the modulated signal modulated by the VCO 44.

The first local oscillator 35 is used as a common channel oscillator of the receiver 33 and the transmitter 34, and includes the VCO 44 and the reference oscillator 46 described above.
a, which controls oscillation of the VCO 44 (Phse L
and a loop filter 47 for smoothing the oscillation control voltage output from the PLL IC 46. The PLL IC 46 oscillates the VCO 44 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 15.

Next, the operation of the transmitting / receiving apparatus 1 will be described.

First, a case where the apparatus operates as a MIDI data transmitting apparatus will be described. At the time of standby, the CPU 11 operates the keyboard 3 via the MIDI data input unit 13.
It monitors whether or not MIDI data has been output from the CPU. M
When the IDI data is output, the CPU 11
After storing the DI data in the MIDI data temporary storage unit 14, a transmission control signal (press signal, transmission start signal) is output to the transmission / reception unit 17 via the control signal output unit 15, thereby setting the transmission / reception unit 17 in the transmission mode. Set to. Also,
At the same time, as shown in the upper part of FIG. 3, the CPU 11 transmits data other than MIDI data, for example, dummy data such as repetition of data “1” and “0” via the transmission data output unit 16 to the transmission / reception unit. 17 is output.

The VCO 44 of the transmission / reception unit 17 outputs a first local oscillation signal modulated based on the dummy data input via the low-pass filter 43 to the transmission RF amplifier 45, and the transmission RF amplifier 45 has a predetermined gain. After that, the wireless signal is transmitted via the antenna 30.

On the other hand, the CPU 11 starts counting by an internal counter from the time when the transmission control signal is output,
When the count value reaches a predetermined value (a predetermined time), the output of the dummy data is stopped, and the MID stored in the MIDI data temporary storage unit 14 is stored as shown in the upper part of FIG.
I data is transmitted to the transmission / reception unit 1 via the transmission data output unit 16.
7 is output. Next, the VCO 44 outputs the first local oscillation signal modulated based on the MIDI data to the transmission RF amplifier 45, and the transmission RF amplifier 45 amplifies the signal at a predetermined gain, and then transmits the wireless signal via the antenna 30. .
When all the MIDI data is transmitted, the CPU
11 turns off the transmission control signal and terminates the transmission.

Next, a case where the apparatus operates as a MIDI data receiving apparatus will be described. During standby, the CPU 11 monitors whether a carrier signal has been input from the transmission / reception unit 17. When a carrier signal is input (when the carrier signal rises as shown in the middle part of FIG. 3), the transmission / reception unit 1
7 and the received data input via the received data input unit 18 are stored in the MIDI data temporary storage unit 14, and the internal counter is started to count in synchronization with the input. When the count value of the counter reaches a predetermined value, the CPU 11 determines that the transmission of the dummy data has been completed on the transmission side, and determines that the received data received thereafter is M
As shown in the lower part of FIG. 3 as IDI data,
The received data is output to the tone generator 4 via the MIDI data output unit 19. The CPU 11 determines whether the received data stored in the MIDI data temporary storage unit 14 is dummy data or control data until the counter value reaches a predetermined value. A predetermined control operation is performed according to the control data.

As described above, according to the present embodiment, the transmission / reception apparatus 1 can transmit MIDI data and control data other than MIDI data on the same carrier.
At this time, without adding a special identifier, MI
Since the DI data can be distinguished from other data, the receiving device can be prevented from outputting data other than the MIDI data to a sound source device or the like.
The CPU 11 also determines that the received data to be input is MIDI data.
Since there is no need to constantly determine whether the data is data or not, the burden is reduced, and the time for that can be effectively used for other controls. Further, since the reception control data or the dummy data can be used as synchronization data for measuring a predetermined time, the measurement of the predetermined time can be performed accurately.

In addition, since control data and the like of the receiving apparatus can be transmitted for a predetermined time after the start of transmission, the data utilization efficiency during the transmission time does not decrease.

The carrier signal of the embodiment is a signal obtained by detecting an IF signal (carrier detection signal), but is not limited to this. A signal based on a signal obtained by detecting noise, a so-called noise squelch signal, or a carrier detection signal An AND signal of a signal and a noise squelch signal may be used.

Further, the transmitting and receiving unit 17 of the embodiment may be configured to be capable of transmitting and receiving by infrared rays.

In this embodiment, the keyboard 3
Although transmission and reception between the sound source device 4 and the other keyboard 5 have been described, the present invention is not limited to this.
It is possible to transmit and receive between all MIDI musical instruments such as a performance device such as a MIDI guitar and a MIDI guitar, a sound source device and a sequencer. If the transmission / reception device 1 is connected to a performance information recording device such as a sequencer, the performance information recording device receives a wireless signal transmitted from another MIDI musical instrument and performs a performance based on MIDI data demodulated from the wireless signal. Information can be recorded (processing of performance information).

In this embodiment, the transmission / reception unit 17
Is configured to perform transmission and reception by using an 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 17 is configured to perform transmission / reception of the simplex system. May be configured.

Further, in the embodiment, the radio signal modulated based on the reception control data and the dummy data is transmitted at a predetermined time after the transmission is started.
For example, it may be configured to transmit a wireless signal modulated based on null data, that is, an unmodulated wireless signal.

[0041]

As described above, according to the MIDI data transmitting apparatus of the present invention, the transmitting apparatus transmits the MIDI data output from the MIDI musical instrument after the transmission time reaches the predetermined time. As a result, it is possible to prevent data other than MIDI data from being treated as MIDI data, thereby preventing malfunction of a sound source device or the like on the receiving device side. In addition, data other than MIDI data can be transmitted by the same carrier, so that the receiving device can be controlled. Further, the reception device can accurately measure the reception time by using the reception control data and the like as synchronization data for measuring the reception time. As a result, malfunction of the sound source device and the like on the reception device side can be prevented. It can be reliably prevented. Further, the receiving device outputs the received data after the reception time from the detection of the reception reaches a predetermined time to the MIDI musical instrument as MIDI data. As a result, only the MIDI data can be output to the MIDI musical instrument, so that malfunction of the sound source device or the like on the receiving device side can be prevented.

[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 transmission / reception unit according to the embodiment of the present invention.

FIG. 3 is a time chart showing transmission of a radio signal on a transmission side, output of a carrier signal to a CPU, and output of reception data to a MIDI musical instrument on a reception device side.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transmitting / receiving device 3 keyboard 4 sound source device 5 keyboard 11 CPU 33 receiving unit 34 transmitting unit 40 receiving IC

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) G10H 1/00 H04B 1/02-1/06 H04B 1/16 H04B 1/38-1/58 H04B 7 / 24-7/26 113 H04Q 7/00-7/04

Claims (2)

(57) [Claims] An electronic musical instrument which outputs MIDI data for transmitting performance information is connected to the MIDI musical instrument .
MIDI data and other MIDI data
A transmitting unit that modulates the high-frequency signal based on one of the reception control data for controlling the transmitting device and transmits the modulated radio signal to the receiving device, and starts transmission of the transmitting unit. A transmission data output unit for outputting the MIDI data and the reception control data to the transmission unit, and measuring a transmission time from a start of transmission of the transmission unit. A transmission time measuring unit, wherein the transmission data output unit outputs the reception control data to the transmission unit until the transmission time reaches a predetermined time,
After the transmission time reaches the predetermined time, the MIDI
A MIDI data transmitting device configured to output data to the transmitting unit. 2. MIDI data for transmitting performance information.
Connected to a MIDI instrument that processes performance information based on
In the transmitting device, the MIDI data and the M
Based on one of the reception control data other than the IDI data
Are respectively modulated according to the reception control data and the
Receives wireless signals transmitted in the order of MIDI data
A receiving unit for demodulating the received signal and demodulating the received signal;
Controlling the receiving unit in accordance with the received data based on the signal;
And outputs the received data to the MIDI instrument.
MIDI data comprising a receiving data output unit
A device for receiving based on the received signal and / or the demodulated signal.
A reception detection unit for detecting the presence / absence, and from when the reception detection unit detects that reception has been performed.
A reception time measurement unit for measuring the reception time of the reception data , the reception data output unit, the reception time reaches a predetermined time
Control the receiving unit according to the received data until
And after the reception time reaches the predetermined time,
Data to the MIDI instrument.
An apparatus for receiving MIDI data.