JPH01106094A - Enunciation channel assignment method and apparatus for electronic musical instrument - Google Patents

Abstract

PURPOSE: To obtain the electronic musical instrument which has neither noise nor sounding delay by carrying on damping and new sounding over different channels simultaneously. CONSTITUTION: A same-sound inspecting means 11 detects an equal-interval sound and when the sound having an equal interval is detected, an erasing means 12 starts damping the sounding of the sounding channel. Then a channel determining means 13 specifies new sounding to the sounding channel and then an assignment data output means starts the new sounding, so the damping and new sounding are advanced in parallel. Consequently, neither noise nor sounding delay is caused by the damping and an interference state of a musical sound can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of assigning sound channels of an electronic musical instrument having a plurality of sound channels.

As shown in FIG. 3, the conventional channel assignment method for electronic musical instruments generally includes a data input means 31 for receiving a sound request signal from a keyboard, etc., and a data input means 31 for assigning the input sound request signal to a sound generation channel. It consists of a channel designation means 32 and a data output means 33 which creates data necessary for sound generation from the sound generation request signal and sends the data to the sound generation channel designated by the channel designation means 32.

Conventionally, a channel designation method has been used in which a channel is sequentially assigned from among a plurality of empty channels that are not in a sounding state.

However, if you keep the sustain effect applied to one of the four channels, set the key off state, and keep the note sounding continuously, if you play a note of the same pitch on another channel, you will hear the same pitch from two or more channels at the same time. The sound will be pronounced. In this state, unless the fundamental wave component and harmonic component of the musical tone are in the same phase between channels, they will interfere with each other. This results in different timbre and pitch sensations depending on the phase relationship of the start timing of sound production.

For this reason, the method shown in FIG. 5 was devised. That is, the same-tone testing means 51 tests sounds of the same pitch, and when the sound of the same pitch is already in the key-off state and sustain state (is a method in which a new sound generation request signal sound is assigned to the channel of that sound). It is.

This is intended to prevent interference due to waveform phase.

Problems to be Solved by the Invention However, in the conventional method described above, the channel that is currently sounding is dumped (silenced) and a new sound is then produced. FIG. 6(a) shows an example of an envelope waveform of a musical instrument. In FIG. 6(,), the signal is dumped in the tl interval, but if the tl interval is short, noise will occur due to the sudden change in the envelope waveform. On the other hand, if the period of tl is lengthened, the rise of the next sound to be started will be delayed, resulting in a delay in sound production. It has a drawback. It is an object of the present invention to solve the problems of the prior art and to provide an electronic musical instrument that is free from noise and sound delay.

Means for Solving Interval Vertices In order to achieve the above object, the present invention uses a homophone checking means to check whether a sound of the same pitch as a new sound to be produced has already been pronounced, had been invented, an action would be taken to silence the sounding channel in which that sound is being produced, and in parallel with this muting action, an action would be performed to make the newly to be produced sound sound on another sounding channel. This is what I did.

In the conventional example, the dump and the new sound are performed on the same channel, but in the present invention, the dump and the new sound are performed simultaneously on different channels.

Example An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the homophone testing means 11 is a means for comparing the pitch of the sound that is requested to be produced with the pitch of the sound that is already being produced to determine whether they match. Based on the result, the designated channel is dumped, and the channel determining means 13 is a means for determining the channel to which the sound requested to be produced is assigned.

These homophone testing means 11. Erasing means 12. The channel determining means 13 has its function in a microcomputer constituting an assignment control section to be described later.

In FIG. 1, the same-tone testing means 11 detects the same-tone before the same-tone interval. If a sound of the same pitch is detected, the erasing means 12 starts dumping the sound of that sound generation channel. Next, the channel determination means 13 designates a new sound generation to another sound generation channel, and the next assignment data output means 62 starts the new sound generation. For this reason, the dump and the new pronunciation proceed simultaneously in parallel.

FIG. 2 is a block diagram of an electronic musical instrument to which the method of the present invention is applied. A sound generation request signal 26 generated by a performance operation on the keyboard section 21 is sent from the keyboard section 21 to the assignment control section 22 .

The assignment control section 22 is connected to the channel table memory 24.
and the assignment memory 25, determine the channel to be assigned, write the note data etc. of the sound to be produced in the address corresponding to the channel in the assignment memory 25, register the pronunciation, and Create data and send the data to the corresponding channel in the tone generator 23. The assignment memory 26 is a memory that stores information (pitch, etc.) of the sound being produced. The channel table memory 24 is a data table for registering vacant channels in the key-off state, and stores channel numbers. - As an internal operation, the key-off timing is registered in the order of the oldest, and when a sound is requested by key-on, the channel number to be assigned is specified in accordance with this oldest order.

Once assigned, the channel number is deleted from the channel table memory 26. On the other hand, if a key-off channel occurs, that channel number is registered. FIG. 3 shows an outline of the operation of the channel control section 22, and since the outline of the operation has been described above, the explanation thereof will be omitted.

FIG. 4 shows the contents of FIG. 1 in detail. Here, the data to be newly produced based on the new pronunciation request is defined as "new pronunciation data."

First, in step 41, the data of each channel in the assignment memory 26 is sequentially read out and compared with the new sound generation data. If the data match and the dump flag is 0 (reset state) in step 42, the process advances to step 44. Then, in step 44, the channel is dumped (mute), the dump flag is set to 1, and the process proceeds to step 45.

Here, the dump flag is a flag indicating that the above-mentioned mute processing has been performed, and is a flag used to correctly specify the channel to be dumped when the same note is repeatedly pressed. If there is no match in step 41, or step 4
If the dump flag is o (reset state), the process advances to step 43.

Then, steps 41 and 42 are executed for all channels. If the process proceeds to step 43 even after all channels have been tested, the process directly proceeds to step 46. In step 46, the channel number to which the new sound generation data is to be assigned is retrieved from the channel table memory 24, and the channel number is deleted from the channel table memory 24 for the next sound generation request. Next, in step 46, the dump flag in the assignment memory 25 corresponding to the channel number taken out in step 45 is reset. This initializes the dump flag that functions when the key is turned off.

According to the above method, as shown in FIG. 6(b)l(c), in the channel to be dumped in FIG. 6(b), the sound is dumped in the interval t2; )'s new pronunciation channel allows the sound to rise without any delay in pronunciation. Since t2 can be set longer than tl, noise can be prevented from occurring.

In addition, in FIGS. 6(b) and 6(c), the sounds overlap in the interval t2, but since it is an extremely short time (several milliseconds), it cannot be heard as a state of phase interference.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, as described above, the same-tone testing means checks whether a sound with the same pitch as the new sound to be produced has already been produced, and determines whether or not a sound with the same pitch has been invented. For example, the sound generation channel in which the sound is being produced is muted, and in parallel with this mute operation, the sound to be newly produced is produced in another sound generation channel. , it is possible to prevent musical tones from interfering with each other without causing noise or delay in pronunciation due to dumping.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the operation of an embodiment of the present invention;
FIG. 2 is a block diagram of an electronic musical instrument to which the present invention is applied;
3 is a flowchart showing the general operation of a general assignment control section, FIG. 4 is a flowchart showing the operation of the embodiment of the present invention, FIG. 6 is a flowchart showing the operation of the conventional example, and FIG. 6 is a flowchart showing the operation of the conventional example. FIG. 3 is a waveform diagram of an envelope waveform in an embodiment of the present invention. 11... Homogeneous checking means, 12... Erasing means, 13... Channel determining means, 22...
...Assign control section.

Claims (2)

[Claims] (1) Checking whether a sound with the same pitch as the new sound to be produced has already been produced using a homophone testing means;
If a sound of the same pitch has been invented, the operation of silencing the sounding channel in which that sound is being produced and, in parallel with this silencing operation, the action of producing the newly to be produced sound on another sounding channel. A method of assigning sound channels for electronic musical instruments. (2) a plurality of pronunciation channels, a homophonic testing means for checking whether a sound of the same pitch as the sound to be emitted has already been produced, and a muting means for muting the pronunciation channel in which a sound of the same pitch has been produced; A sounding channel assigning device for an electronic musical instrument, comprising channel determining means for specifying a channel to which a sound to be produced is assigned from among sounding channels other than the relevant channel.