JPH1039861A - Playing information storage device and electronic musical instrument having this device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to decrease the data quantity to be stored in a signal receiving buffer by providing the storage device with a checking means for checking the coincidence with the channel numbers registered in a register means and providing the device with means for storing only the part of the inputted playing information when the coincidence is detected. SOLUTION: If the channel number set with such timbre that its interval is fixed is registered in the register means, only the remaining two bytes are stored without storing the first data byte in a RAM 4 used as a signal receiving buffer when the note on/off message of the channel is received. If the registered channel is detected at the time of reading out from the RAM 4, the fixed value of the preset interval is added to the read out data and the data is outputted. At this time, a CPU 1 executes the control over the entire part of an electronic piano in accordance with the control program stored in a ROM 3. The CPU 1 is provided with a serial port for connection of a hardware timer interruption circuit and a MIDI interface circuit 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a performance information device and an electronic musical instrument equipped with the device, and more particularly to a performance information storage device capable of reducing the amount of data when receiving and storing performance information such as MIDI signals. And an electronic musical instrument provided with the device.

[0002]

2. Description of the Related Art Conventionally, electronic pianos, synthesizers, MI
Some electronic musical instruments such as DI sequencers and information processing apparatuses such as personal computers have a MIDI signal transmission / reception function. In such a device, the MI
Every time one byte of the DI message is received, the CPU is interrupted and the received data is stored in the reception buffer as it is. Therefore, in the case of the note on / off message, three bytes of the status byte including the MIDI channel data, the first data byte including the note number (key number information), and the second data byte including the velocity data are stored in the reception buffer. It had been. Then, for example, in the main processing of the CPU, it is checked whether or not data is stored in the reception buffer. If the data is stored, the data is read out and sound generation processing and the like are performed.

[0003]

In the conventional performance data storage method, all the received data is stored. However, for example, some timbres such as organs have almost no change in velocity, and there is also an effect. Some have no pitch, such as sound. In such data, there is a problem that even if the note number, which is the velocity or pitch information, is stored in the reception buffer, it is not used in the tone generation processing, and the reception buffer is occupied uselessly. SUMMARY OF THE INVENTION An object of the present invention is to provide a performance information storage device that solves the above-mentioned problems of the conventional technology and that can reduce the amount of data stored in a reception buffer, and an electronic musical instrument including the device. .

[0004]

According to the present invention, in a performance information storage device, a storage means for storing performance information, a registration means for registering a specific channel number of the performance information, and a channel number of the input performance information are provided. Checking means for checking the coincidence with the channel number registered in the registering means, and means for storing only a part of the input performance information in the storing means when the checking means detects a match. It is characterized by having been provided. Further, a fixed value storage means for storing a fixed value of the parameter, a reading means for reading the performance information from the storage means, and a check for checking whether the channel number of the read performance information matches the channel number registered in the registration means. If the match is detected by the means and the checking means, the read performance information includes
There is provided means for adding and outputting a fixed value read from the fixed value storage means.

According to the present invention, when a channel number in which a tone having a fixed pitch is set is registered in the registering means, a note-on / off message of the channel is received. Instead of storing the first data byte in the receive buffer, only the remaining two bytes are stored. At the time of reading from the reception buffer, when detecting that the channel is a registered channel, a fixed value of a preset pitch is added to the read data and output. Therefore, the amount of data stored in the reception buffer is reduced, and the possibility of overflow of the reception buffer is reduced. Also, the same overflow probability can be achieved with a smaller buffer capacity. Further, the receiving processing load is reduced, and the processing time is also reduced.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an electronic piano to which the present invention is applied. CPU1
Is a central processing unit that controls the entire electronic piano based on a control program stored in the ROM 3.
The CPU 1 includes a hardware timer interrupt circuit and M
A serial port for connection to the IDI interface circuit 2 is also provided. The MIDI interface circuit 2 is a circuit for transmitting and receiving MIDI messages to and from an external MIDI device.

The ROM 3 stores control programs, timbre parameters, performance data for automatic performance, and the like. The tone color parameters include musical tone waveform address information and envelope control information stored in the waveform memory. RA
M4 is used as a work area and a buffer, and also stores performance information written by the user. Further, it may be backed up by a battery or the like. The panel circuit 5 is composed of various switches for selecting tone colors and the like and a display device for displaying characters and the like by liquid crystal or LED, and is connected to the bus 14 by the panel interface circuit 6. The keyboard 7 includes, for example, a plurality of keys each having two switches, and the keyboard interface circuit 8 includes:
The state of the switch of each key is scanned, and a change in the state is detected to generate key event information and touch information.

The tone generator 9 is a circuit for generating a desired tone signal by, for example, a waveform reading method. The tone generator 9 is stored in a waveform memory 10 in which digital tone waveform sample values are stored at address intervals proportional to the pitch to be sounded. The waveform data is sequentially read out, and an interpolation operation is performed to generate a tone waveform signal. It also has an envelope generating circuit, multiplies the tone waveform signal by an envelope signal generated based on the set envelope parameters, gives an envelope, and outputs a tone signal. The tone generating circuit 9 has a plurality of (for example, 32) tone generating channels. However, in practice, a plurality of tone signals are simultaneously and independently generated by operating one tone generating circuit in a time-division multiplexing manner. It is configured to be possible.

The D / A converter 11 converts a digital tone signal into an analog signal, and the tone signal amplified by the amplifier 12 is output from a speaker 13. The bus 14 connects each circuit in the electronic piano. If necessary, a memory card interface circuit, a floppy disk device, and the like may be provided.

FIG. 2 is a flowchart showing the main processing of the CPU 1. When the power is turned on, step S1
, The data setting state in the RAM 4 and the tone generator 9 in the apparatus is returned to the initial state. In step S2, it is determined whether or not there has been a change in the state of various switches on panel 5, and if a state change has been detected, a corresponding process is performed. In step S3, it is determined whether or not the occurrence of a key-on or key-off keyboard event has been notified from the keyboard interface circuit 8. If a keyboard event has occurred, a corresponding process is performed.

In the MIDI processing of step S4,
As described later, it is determined whether or not a MIDI message is stored in a reception buffer provided in the RAM. If a MIDI message is stored, sound generation processing is performed, for example, in the same manner as a keyboard event. The storing of the received message in the receiving buffer is executed by MIDI reception interrupt processing described later. In step S5, a well-known automatic performance process is executed.
In step S6, an effect imparting process or the like is executed as other processes.

FIG. 3 is a flowchart showing the contents of the MIDI reception interrupt processing. This processing is executed by the CPU 1
It is started by an interrupt generated every time one byte of IDI data is received. In step S10, by checking the MSB of the received MIDI data, it is determined whether or not the byte is a status byte. If it is a status byte, the byte is stored in a predetermined area for a running status, and the process proceeds to step S11.

FIG. 6 is an explanatory diagram showing a data format of a note-on message which is one of the MIDI messages. This message is composed of 3 bytes, and the upper 4 bits of the first status byte are 9H representing the note-on message, that is, "1001". The MSB of the status byte is always "1". The lower 4 bits indicate the MIDI channel number. Note numbers are stored in the lower 7 bits of the first data byte, and velocity data are stored in the lower 7 bits of the second data byte, and the MSB of the data byte is always "0".

In step S11 of FIG. 3, it is determined whether or not the message is a key-on / off message. If the result is affirmative, the process proceeds to step S12. Step S1
2, the channel number of the MIDI message is
It is determined whether or not it matches the channel number registered in the data fixed channel table as the registration means.

FIG. 4B is an explanatory diagram showing an example of the contents of the data fixed channel table. In this table, data indicating whether or not the pitch is fixed and data indicating whether or not the velocity is fixed are registered for each MIDI channel by processing as described later. For example, 3
For the channel, the pitch fixed data is “1”, indicating that a fixed tone color is set. In addition, the fixed velocity data of channel 5 is “1”, which means that the fixed velocity channel is used. Note that both the pitch and velocity may be “1”.

In FIG. 3, if the result of the determination in step S12 is affirmative, the process proceeds to step S13, where it is determined whether or not the channel is a fixed pitch channel. If the result is affirmative, the process shifts to step S14 to set the pitch fixed flag to ON. In step S15, it is determined whether or not the channel is a fixed velocity channel. If the result is affirmative, the process proceeds to step S16, where the fixed velocity flag is set to ON. In step S24, the received data is stored in the reception buffer.

If the decision result in the step S10 is negative, the process shifts to a step S17 to determine whether or not the status is the running status, that is, whether the status byte is omitted and the data byte is received at the timing when the status should be received. It is determined whether or not. If the result is affirmative, the process shifts to step S18 to execute the processing of the running status. That is, the stored status information immediately before is read, and a pitch fixed flag and a velocity fixed flag are set based on the channel number information of the status information.

In step S19, it is determined whether or not the received data is the second byte (third byte) by referring to a received byte counter (not shown). If the result is negative, the process proceeds to step S22. If affirmative, the process proceeds to step S20. In step S20, it is determined whether or not the pitch fixed flag is ON. If the result is negative, the process proceeds to step S24, where the data is stored in the reception buffer.
Then, the process goes to 21 to turn off the pitch fixing flag and end the process without storing data. In step S22, it is determined whether or not the velocity fixed flag is on. If the result is negative, the process proceeds to step S24,
The data is stored in the reception buffer. If the result is affirmative, the process proceeds to step S23, the velocity fixed flag is turned off, and the process ends without storing the data.

FIG. 5 is a flowchart showing the contents of the MIDI processing in step S4 of FIG. 2 when a MIDI message has been received. In step S30, one byte of data is read from the reception buffer. In step S31, it is determined whether or not the read data is a status byte. If the result is negative, the data is regarded as a running status and step S32 is performed.
Then, the immediately preceding status information is read from the reception buffer or a predetermined storage area, and the reception buffer read pointer is returned by one.

In step S33, it is determined whether the message is a key-on / off message. If the result is negative, the process proceeds to step S41, but if the result is positive, the process proceeds to step S34. In step S34, with reference to the data fixed channel table, it is determined whether or not the channel number of the read status byte is a fixed pitch channel. If the result is negative, the process proceeds to step S35, where the second data byte is read from the reception buffer.
The flow shifts to 36, where a fixed value is read from a predetermined fixed value storage area as the second byte. The fixed value may be settable for each channel number, or may be a common fixed value. Further, if the fixed value of the pitch is completely irrelevant to the pronunciation, for example, "0" may be set without reading the data.

In step S37, it is determined with reference to the data fixed channel table whether or not the channel number of the read status byte is a fixed velocity channel. When the result is negative, the process proceeds to step S38, and the third data byte is read from the reception buffer. When the result is positive, step S39 is performed.
Then, the fixed value is read from the predetermined fixed value storage area as the third byte. In step S40, a well-known sound generation process is executed based on the read MIDI message.

If the decision result in the step S33 is negative, that is, if it is a message other than the key on / off, the process shifts to a step S41 to read the remaining data bytes (1 or 2 bytes). In step S42, it is determined whether or not the message is a tone color setting instruction message for an arbitrary channel. If the result is positive, the process proceeds to step S43. In step S43, it is determined whether or not the tone color number to be set is a data fixed tone color.

FIG. 4A is an explanatory diagram showing an example of a table stored in advance in a ROM or the like, in which whether or not a data fixed tone is registered for each tone color number. The tone number in which "1" is set in the table indicates a tone number with fixed data. For example, tone number L is a tone pitch fixed tone color, and tone color number N is a tone tone with both pitch and velocity fixed. . If the determination result of step S43 is affirmative, the process proceeds to step S44, and the data fixed channel table of FIG. 4B is updated.

For example, when a message for setting the tone number L to the MIDI channel 3 is read out, FIG.
By referring to the table (a), it is determined that the tone color number L is a fixed tone pitch tone color. Therefore, FIG.
The pitch fixed bit 1 is set in the column of three channels in the data fixed channel table of (b). Thus, the data fixed channel table is updated.

In step S45, system processing corresponding to each message such as tone color setting, tempo setting, and volume setting is executed. By the above processing, the amount of data stored in the reception buffer is reduced, the overflow is reduced, and the processing time is also reduced.

Although the embodiment has been described above, the following modified examples are also conceivable. In the embodiment, an example in which the key-off data is handled in the same manner as the key-on data is disclosed. However, if the velocity of the key-off data is not used for the tone generation processing, the second data byte of the key-off data may be always treated as a fixed value. If the data bytes are both fixed in the running status, there is no more data to be stored. In this case, the status bytes may be stored. The present invention relates to MIDI
The present invention is applicable to any device having a receiving function.

[0027]

As described above, in the present invention,
For example, when a channel number in which a tone having a fixed pitch is set is registered in the registration unit, when a note-on / off message of the channel is received, the first data byte is not stored in the reception buffer. Only the remaining two bytes are stored. At the time of reading from the reception buffer, when it is detected that the channel is a registered channel, a fixed value of a preset pitch is added to data and output. Accordingly, the amount of data stored in the reception buffer is reduced, and the possibility of overflow of the reception buffer is reduced. Also, the same overflow probability can be achieved with a smaller buffer capacity. Further, there is an effect that the reception processing load is reduced and the processing time is also reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an electronic piano to which the present invention is applied.

FIG. 2 is a flowchart illustrating a main process of a CPU 1;

FIG. 3 is a flowchart showing the contents of MIDI reception interrupt processing.

FIG. 4 is an explanatory diagram showing an example of the contents of various tables.

FIG. 5 is a flowchart showing the contents of the MIDI processing in S4 of FIG. 2;

FIG. 6 is an explanatory diagram showing a data format of a note-on message which is one of the MIDI messages.

[Explanation of symbols]

1 ... CPU, 2 ... MIDI interface circuit, 3 ...
ROM, 4 RAM, 5 panel, 6 panel interface circuit, 7 keyboard, 8 keyboard interface circuit, 9 tone generator circuit, 10 waveform memory, 11 D / A converter, 12 amplifier, 13 ... Speaker, 14 ... bus

Claims (4)

[Claims] A storage unit for storing performance information; a registration unit for registering a specific channel number of the performance information; a match between the channel number of the input performance information and a channel number registered in the registration unit; And a storage means for storing only a part of the input performance information in the storage means when a match is detected by the check means. 2. A fixed value storage means for storing a fixed value of a parameter; a reading means for reading performance information from the storage means; and a channel number of the read performance information and a channel number registered in the registration means. Checking means for checking a match; and, when a match is detected by the checking means, the read performance information is added with a fixed value read from the fixed value storage means and output. The performance information storage device according to claim 1. 3. Checking tone color designation information in the performance information, and checking at least one of the pitch and velocity information.
3. The apparatus according to claim 1, further comprising a registration setting unit that detects a channel number in which a tone color that can be replaced with a fixed value is set, and registers the channel number in the registration unit. Performance information storage device. 4. An electronic musical instrument comprising the performance information storage device according to claim 1.