JPH08202361A - Electronic instrument - Google Patents

Abstract

PURPOSE: To provide an electronic instrument preventing a required sound from being erased even when the number of pronounciation channels shortage state is occured. CONSTITUTION: In the electronic instrument generating a musical sound signal by using plural musical sound generation channels based on performance information incorporating pronounciation information separated to plural parts, a key assigner decides whether or not a free pronounciation channel exists when the pronounciation timing arrives, and when no free channel, whether or not the channel pronouncing in a part exists in order from the part with the highest muffle priority. Then, in the part where the pronouncing channel is detected, one pronouncing channel is selected according to a prescribed condition, and the pronounciation of the channel is stopped, and the opened channel is assigned to new key-on information. Further, a table storing the muffle priority is provided, and the contents of the table are revised based on user's operation or the information incorporated in the performance information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical instrument, and more particularly to an assigner that assigns pronunciation information to a pronunciation channel.

[0002]

2. Description of the Related Art A conventional electronic musical instrument has a plurality of sounding channels, and processing information called a key assigner sequentially assigns information to be sounded to the empty sounding channels. However, since the number of sounding channels is finite, there is a possibility that all sounding channels are already sounding when trying to allocate sounding information. In such a case, in the conventional electronic musical instrument, the oldest key pressing order or the lowest signal level is selected to rapidly attenuate the tone signal of the sound generation channel and open the channel. , Was assigned new pronunciation information.

[0003]

In the conventional electronic musical instrument as described above, automatic accompaniment data or MIDI data consisting of performance information of each part such as melody information, chord information, bass information and rhythm information is stored or input. By doing so, some have a function of performing automatic accompaniment or automatic performance. However, the conventional key assign method has a problem in that the sound of the melody part, the sound of the chord or bass part that is desired to be sounded for a long time is erased due to the insufficient number of sounding channels. The purpose of the present invention is to
An object of the present invention is to provide an electronic musical instrument in which the above-mentioned problems of the prior art are improved and a necessary sound is not erased even when the number of sounding channels is insufficient.

[0004]

A first invention is based on performance information including pronunciation information divided into a plurality of parts.
In an electronic musical instrument that generates a tone signal using a plurality of tone generation channels, an empty channel detection unit that determines whether or not there is an empty tone generation channel when the timing at which each pronunciation information should be sounded arrives, If there are no free channels, the part with the highest priority level of silence will be
In a sounding channel detecting means for determining whether or not a channel being sounded in the part, and in a part in which a sounding channel is detected by the sounding channel detecting means,
The present invention is characterized by comprising channel selecting means for selecting one sounding channel according to a predetermined condition and sound generation stopping means for stopping sound generation of the channel selected by the channel selecting means. A second invention is based on the first invention, wherein the sounding channel detecting means is based on at least one of a table storing the mute priority order and information included in the user's operation or performance information. It is characterized by comprising means for changing the contents of the table.

[0005]

In the first aspect of the invention, when there is no empty channel when the sounding timing of each sounding information arrives,
In order from the part with the highest mute priority, it is determined whether or not there is a channel being sounded in the part, and in the part in which the channel being sounded is detected, one sounding channel is sounded according to a predetermined condition. Since it will be stopped, if you lower the mute priority of the part you do not want to mute,
The possibility that the required sound is muted is reduced. Further, in the second invention, a table storing the mute priority order is provided, and the contents of the table are changed based on the mute priority change information included in the user's operation or performance information. Even when the part is changed, by changing the contents of the table, the mute priority of the melody part is always set low, and the possibility that the sound of the melody part is muted can be reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a block diagram showing the configuration of an electronic musical instrument to which the present invention is applied. The CPU 1 is a central processing unit that controls the entire electronic musical instrument based on a control program stored in the ROM 2. The CPU 1 has a built-in timer circuit that issues a timer interrupt to the CPU 1 at a set predetermined cycle. The RAM 3 is used as a work area and a buffer for storing performance information. In addition, it is configured to be backed up by a battery so that the set information can be retained even when the main power is turned off.
The MIDI interface circuit 4 performs transmission / reception processing of a MIDI signal, and when the MIDI signal is received, the CP
The U1 is interrupted and the received data is transferred to the buffer in the RAM3. The panel 5 has various switches such as timbre and effect selection switches and a display device for displaying characters and figures by liquid crystal or LEDs, and the panel interface circuit 6 interconnects the CPU 1 and the panel 5.

The keyboard 7 is composed of, for example, a plurality of keys each having two switches, and the keyboard interface circuit 8 scans the state of each switch,
It is composed of a circuit to be taken into U1. The tone generator circuit 9 includes, for example, a plurality of (e.g., 20) tone generation channels that generate musical tone signals by reading musical tone waveforms from the waveform memory 10 at address intervals proportional to the pitch and multiplying them by envelope signals. Is realized by time-division multiplexing operation of one circuit. The D / A converter 11 D / A converts the digital tone signal, and the amplifier 12 amplifies the tone signal to drive the speaker 13. Bus 14
Connects the circuits in the electronic musical instrument. In addition to this, if necessary, a memory card interface circuit, FD
A D (floppy disk drive) interface circuit or the like may be provided.

FIG. 3 is an explanatory diagram showing an example of a key assignment table provided in the RAM 3. As shown in the figure, the key assignment table is for each sound channel number (1 to 20 in this example), key number, part number or MIDI channel number, key pressing sequence information, gate time, event source ID (identification information). , Each information of the usage state is stored. Key number is, for example, MID
Pitch information (0-1) used in I message
27). The part number is a number representing a part such as melody, bass, chord, rhythm, etc. The key depression order information is, for example, FFH (H represents a hexadecimal number) immediately after the pronunciation information is assigned to the channel, and 1 is subtracted each time other pronunciation information is assigned. Indicates that the smallest of is the oldest pronunciation. The gate time is information for controlling the musical sound of the rhythm (percussion) part, and indicates the sounding duration time from the start of sounding. For the event source ID, for example, 1 is a keyboard, 2 is MIDI reception, 3
Indicates the source of pronunciation information, such as automatic performance. The use state indicates whether the sounding channel is vacant (0), sounding (1), or held (2: key off, but the sound continues to be generated by damper pedal on). .

FIG. 4 is a flow chart showing the main processing of the CPU 1. When the power is turned on, step S1
In, the contents of the RAM 3 and the registers in the tone generator circuit 9 are initialized. In step S2, panel event processing is performed, and when there is a change in the state of a switch or the like on the panel, corresponding panel event processing is performed. In step S3, key event processing is performed, and when the switch state of each key of the keyboard changes to key-on or key-off, step S7
The key assignment process of is called and executed. In step S4, the MIDI process is performed, and when the MIDI signal is received in the buffer, the key assign process in step S7 is also called and executed.
The process of transferring the received MIDI signal to the buffer is executed by an interrupt processing program (not shown). In step S5, an automatic performance process is performed, and if there is automatic performance data that has reached the tone generation timing, the key assign process in step S7 is called and executed. The timing counting process for automatic performance is executed by an interrupt processing program (not shown). In step S6, other processing, such as various parameter updating processing of the tone generator circuit 9 based on various effect addition instructions, is performed.

FIG. 1 is a flow chart showing the assigner process of step S7 of FIG. In step S10, it is determined whether the key event is key-on,
If the result is negative, the process proceeds to step S20, and the attenuation process (transition to the release phase) and the channel release process of the corresponding sound generation channel are performed. If the determination result in step S10 is affirmative, step S1
The procedure shifts to 1 and the key assignment table is referred to, and it is determined whether or not there is a vacant tone generation channel. Then, if there is a free space, the process proceeds to step S19, and any one of the free channels is selected and the process proceeds to step S18.
However, as a result of the determination in step S11, if there is no free space, the process proceeds to step S12.

In step S12, the variable N is set to 1, and in step S13, it is determined whether or not there is a sounding of the part whose mute priority is Nth. The electronic musical instrument has a mute priority order table as shown in FIG. 5 in the RAM 3, and the table stores information such as which part or MIDI channel is assigned to each priority order. In step S13, the table is referred to, and it is determined by searching the key assignment table whether or not the pronunciation of the part number 5 having the mute priority 1 is present. In step S13, if there is no channel being sounded in the specific part, the process proceeds to step S14 and N is incremented by 1, and in step S15, it is determined whether N exceeds the maximum priority MAX. If it is determined that the number of parts does not exceed the limit, the process returns to step S13, and the part having the next priority is searched.

In step S13, if there is a channel being sounded, the process proceeds to step S16 and, for example, the key-pressing order is the highest among all sounding channels being sounded in the part corresponding to the mute priority N. Choose the old one. In step S17, the tone generation stop process is performed on the tone generation channel selected in step S16, the signal level is rapidly attenuated to the extent that noise is not generated, and the channel is opened after being sufficiently attenuated. Step S18
In, the key-on information to be sounded is assigned to the channel selected in step S19 or the channel released in step S17. By the above-described processing, the sounds to be muted are searched in order from the part with the highest deletion priority. Therefore, by lowering the priority of the parts that are not desired to be muted, the probability of muting can be reduced.

Although the embodiment has been described above, the following modifications are also possible. The contents of the mute priority table can be read from the panel, or from the commands in the automatic performance data, MI
It may be configured to be changeable by a DI (exclusive) message or the like. By doing so, the optimum silence priority can be set for each song, and when the MIDI file is used for automatic performance, the MI of the melody part will be interrupted.
Even if the DI channel changes, the probability that the sound of the melody part is muted can be reduced. In the embodiment, the priority order corresponds to each part, but the number of priority orders is smaller than the number of parts, and a plurality of parts or MIDI channels may be assigned to one priority order. In this case, in the same priority order, the mute channel may be selected from the parts having the highest number of sounds, or the channels of the respective parts may be selected in order. Also, the minimum number of pronunciations that should be left for each part (for example, 1
It is also possible to unconditionally leave only that number of pronunciations. Further, instead of the mute priority, the pronunciation priority may be set so that the sound with the lowest priority is muted. In step S16 of FIG. 1, the oldest key pressing order is selected, but the lowest sounding level (the most attenuated one) may be selected. In this case, the key assignment table requires level information of each channel instead of key pressing order information.

[0014]

As described above, according to the electronic musical instrument of the present invention, when there is no empty channel, it is determined whether or not there is a channel being sounded in that part in order from the part with the highest mute priority. It is determined whether or not the sounding channel is detected, and the sounding of one sounding channel is stopped according to a predetermined condition. Therefore, if the mute priority of the part that you do not want to mute is lowered, it is necessary. This has the effect of reducing the possibility that the sound will be muted. Further, if a table storing the mute priority order is provided, and the contents of the table are changed based on the user's operation or the mute priority change information included in the performance information, the melody part is changed on the way. Even in such cases, by changing the contents of the table at the same time, it is possible to always set the mute priority of the melody part to a low level and reduce the possibility that the sound of the melody part is muted.

[Brief description of drawings]

FIG. 1 is a flowchart showing an assigner process of the present invention.

FIG. 2 is a block diagram showing a configuration of an electronic musical instrument to which the present invention is applied.

FIG. 3 is an explanatory diagram showing an example of a key assignment table.

FIG. 4 is a flowchart showing a main process of CPU 1.

FIG. 5 is an explanatory diagram showing an example of a mute priority order table.

[Explanation of symbols]

1 ... CPU, 2 ... ROM, 3 ... RAM, 4 ... MIDI interface circuit, 5 ... Panel, 6 ... Panel interface circuit, 7 ... Keyboard, 8 ... Keyboard interface circuit, 9 ... Sound source circuit, 10 ... Waveform memory, 1
1 ... D / A converter, 12 ... Amplifier, 13 ... Speaker, 1
4 ... bus

Claims (3)

[Claims] 1. An electronic musical instrument that generates a tone signal using a plurality of tone generation channels based on performance information including pronunciation information divided into a plurality of parts, when the timing at which each tone information should be sounded arrives. , A free channel detection means for determining whether or not there is a free tone generation channel, and, if there is no free channel, whether or not there is a channel being sounded in that part in order from the part with the highest mute priority Sounding channel detecting means for determining whether or not, and in the part where the sounding channel is detected by the sounding channel detecting means, a channel selecting means for selecting one sounding channel according to a predetermined condition and a channel selecting means for selecting An electronic musical instrument comprising: a sound generation stopping means for stopping the sound generation of the generated channel. 2. The electronic musical instrument according to claim 1, wherein the predetermined condition is one of the earliest key pressing sequence and the one having the smallest musical tone signal level. 3. The sounding channel detection means changes the contents of the table based on at least one of a table storing a mute priority order and information included in user operation or performance information. The electronic musical instrument according to claim 1, further comprising: