JPH06202660A - Electronic musical instrument - Google Patents

Abstract

PURPOSE:To provide the electronic musical instrument which generates a natural musical tone even when pitch bend is made during the use of an automatic harmony function. CONSTITUTION:When a chord is inputted in the left key area on a keyboard 1 and a keying sound is inputted in the right key area, a CPU 5 finds the ratio of the bend width of an additional sound to the bend width of the keying sound on the basis of the chord and keying sound by using an additional sound table memory 8 if a bend is varied with a wheel 3, and corrects the bend quantity of the additional sound according to the ratio, thereby outputting it to a tone generator 9.

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 electronic musical instrument which automatically generates a harmony addition sound from a key depression sound of a keyboard.

[0002]

2. Description of the Related Art Conventionally, in an electronic musical instrument, particularly an electronic keyboard musical instrument, when a chord is input in the left keyboard range and a single note is depressed with the right hand, the key depression sound is generated in accordance with the inputted chord (chord: chord). Some automatically generate several additional sounds. This function is called Auto Harmony. Also,
Generally, an electronic keyboard instrument is provided with a wheel-shaped manipulator called a wheel for changing the pitch of a generated musical tone. By manipulating this wheel, the pitch (pitch) of the musical tone is changed (pitch bend). Is seasoned.

[0003]

However, in the above-mentioned conventional electronic musical instrument, when the auto harmony function is used, for example, the pitch of the key-depressing tone is 2 semitones (1 full tone When the pitch bend is applied so as to increase, that is, in FIG. 7, when the key-depressing sound and the additional sound of the note 101 are generated, when the pitch bend is increased by two semitones, the note 102 is pressed. Not only the key sound, but the additional sound also rises by a semitone. At this time, F
The # sound may generate a strange-sounding musical sound that does not harmonize with the C major chord. In this case, note 1
As in 03, raising only the key-depression sound by two semitones and leaving the additional sound as it is will harmonize with the C major chord, and the musical sound will sound natural.

The present invention has been made in view of the above problems, and an object thereof is to provide an electronic musical instrument which produces a natural-sounding musical tone even when a pitch bend is applied when the auto harmony function is used.

[0005]

In order to achieve the above object, the present invention is a performance assisting apparatus for adding an additional note to a performance note in accordance with a supplied chord, and pitch deviation information for supplying pitch deviation information. Supplying means, performance sound pitch control means for controlling the pitch of a performance sound according to the pitch deviation information, and additional sound pitch for calculating a pitch deviation of the additional sound by the pitch deviation information, the chord and the performance sound. The present invention is characterized by having a deviation calculation means and an additional sound pitch control means for controlling the pitch deviation of the additional sound by the additional sound pitch deviation.

[0006]

When the pitch deviation information supply means obtains the pitch deviation information, the performance sound pitch control means controls the pitch of the performance sound, and the additional sound pitch deviation calculation means based on the pitch deviation information, the chord and the performance sound. Thus, the pitch shift of the additional sound is calculated, and the pitch shift of the additional sound is controlled by the additional sound pitch control means based on the calculation result.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a schematic structure of an embodiment of an electronic musical instrument according to the present invention. In this embodiment, the present invention is applied to an electronic keyboard musical instrument.

Referring to FIG. 1, the electronic keyboard instrument of this embodiment has a keyboard 1, a switch group 2 for variably setting various parameters, the wheel 3 described above, and an A / A for converting the analog output of the wheel 3 into a digital signal. D converter 4,
A CPU 5 that controls the entire apparatus, a program memory 6 that stores a program executed by the CPU 5, a working memory 7 that temporarily stores input information, calculation data, and the like.
An additional sound table memory 8 for storing information for determining an additional sound for a key depression sound, a tone generator (TG) 9 as a sound source, and a sound system 10 for converting an output signal of the tone generator 9 into a sound. There is.

The keyboard 1, the switch group 2, the A / D converter 4, the CPU 5, the program memory 6, the working memory 7, the additional sound table memory 8 and the tone generator 9 are connected via a bus line, and the wheel 3 and the tone generator are connected. The output side of 9 is connected to the input side of A / D converter 4 and sound system 10, respectively.

The program memory 6 and the additional sound table memory 8 are composed of ROM, and the working memory 7 is composed of RAM.

FIG. 2 shows an example of the additional sound table stored in the additional sound table memory 8. This example is an example of the additional sound called Trio.
That is, it is composed of three sounds, a root sound (key depression sound) and two additional sounds. The vertical items in the figure indicate the type of the specified chord, and the horizontal items indicate the frequency of the key-depressing sound from the root note of the specified chord (however, comparison is made as the pitch difference in the range up to 8 degrees). Is shown. In this embodiment,
Of the three tones, the key-depression pitch is always the highest tone, and the additional tone separated by the number of semitones shown in the additional tone table is added as the low tone part. The negative value of the number of semitones indicates that the additional sound is added to the low tone part with respect to the key depression sound.

For example, when a chord of the chord "C (sime measure)" is input in the left key range and the key depression sound is "E", the key depression sound "E" is 3 from the root note "C" of the chord. Since it is above, "-4", "-" from the column of "M" on the vertical axis and "3" on the horizontal axis.
The number of semitones of "9" is obtained, and in addition to the key depression sound "E", "C" of 4 semitone low tones and "G" of 9 semitone low tones are added tones.

The key depression sound is "F", which is one semitone above "E".
, The semitones of "-5" and "-8" are obtained from the column of "4" on the horizontal axis, and the additional tones are "C" and "A".

Therefore, when the key depression sound is "E",
When the wheel 3 bends up one semitone to become "F", the additional tones before the bend up "C", "G"
As with the key depression sound, it can be seen that, as in the case of the key-depression sound, each one-tone half-bend raises the natural sound by "C" and "A".

Therefore, when a pitch bend is made, as will be described later, the most recent additional pitch before the current pitch bend and the key-depression pitch after the bend (the key-depression pitch after the bend are When it cannot be expressed in semitone units, the pitch change width with the additional pitch for the nearest semitone pitch that would be necessary to continue bending in the same direction) and by controlling the bend amount by the pitch change width, Find the pitch shift of the additional sound. By outputting the pitch deviation of the additional sound and the pitch deviation of the key depression sound (that is, the bend amount) to the tone generator 9, a natural-sounding musical sound is generated. That is, in general, the bend amount does not change in a unit of a semitone, but changes in an analog manner until reaching a semitone. Therefore, it is not enough to simply obtain the additional sound corresponding to the bend amount from the additional sound table. Thus, it becomes necessary to find the pitch shift of the additional sound.

The processing operation executed by the CPU 5 in the electronic keyboard musical instrument constructed as described above will be described with reference to the flow charts shown in FIGS.

FIG. 3 is a flow chart of the main routine of this embodiment. In step S1, various parameters are initialized, and then in step S2, it is determined whether or not there is a key event. When there is a key event, the process proceeds to step S3, and it is determined whether or not the key event is generated by the left key range. If the key event occurs in the left key range, the process proceeds to step S4, the chord is detected, the root note of the chord is set to the value RT, and the chord type (chord type) is set to the value TP and stored. Proceed to S6.
On the other hand, if a key event occurs in the right key range, the process proceeds to step S5, the key event process subroutine described below is executed, and the process proceeds to step S6. Also, step S2
If there is no key event, the process after step S3 is skipped and the process proceeds to step S6. That is, as described above, the chord is detected in the left key range, and the additional sound to the key depression sound is determined according to the chord. The key event processing subroutine determines an additional sound for a key depression sound and performs a bend process described later.

Subsequently, in step S6, it is determined whether the output value from the wheel 3 has changed, that is, whether the performer has changed the bend amount. If the bend amount is changed, step S7 is performed. Then, a bend processing subroutine to be described later is executed and the process proceeds to step S8. On the other hand, when the bend amount is not changed, step S7 is skipped and the process proceeds to step S8.

In step S8, other switch processing is performed, and the process returns to step S2.

FIG. 4 is a flow chart of a subroutine of the key event process executed in step 5 of FIG.

In step S11, the key code of the pressed key (hereinafter referred to as "event key code") is set and stored in the value KC, and in step S12, the key code of the highest note that is pressed at the same time. Is set to the value MAX and stored. In the following step S13, the event key code KC is compared with the highest tone key code MAX, and if the event key code KC is the highest tone, step S13.
The processing of 14 and subsequent steps is executed. On the other hand, when it is not the highest tone, the processing of this subroutine is ended. This is because, in general, the additional sound is added to the highest sound of the key depression sound.

In step S14, it is determined whether or not the key event is the key-on event. If the key-event is the key-on event, the process proceeds to step S15 and the event key code KC.
Is set to the value KC1 and stored. Next, step S16
Then, the note name of the event key code KC1 is calculated and NOT
Stored as E1, and in step S17, the root note RT,
Based on the chord type TP and NOTE1, the semitone data of the additional note is read from the additional note table of FIG. 2 and set to values D1 and D2, respectively, and stored. In a succeeding step S18, the result of adding the half tone number data D1 and D2 of the additional sound to the key depression sound KC1 is obtained as values AD11 and A, respectively.
D12 is set and stored, and in step S19, three channels CH1, CH2, C of the tone generator 9 are stored.
KC1, AD11, and AD12 are output to H3, respectively, and at the same time, a key-on signal is output. That is, here
The above-mentioned additional sound is determined and generated.

Further, in step S20, a bend processing subroutine described later is executed to end the key event processing. The bend processing is executed here because when the right key range is depressed, the wheel 3 may already be operated and a request to change the bend may be made.

When the key event is not the key-on event in step S14, step S21
To the key-off signal CH1 of the tone generator 9.
To CH3, the generation of the musical sound is stopped, and the key event process ends.

5 and 6 show the step S in FIG.
6 is a flowchart of a bend processing subroutine executed in 2.

In step S31, the value output from the wheel 3 is read, set to a value HL and stored, and in step S32, this HL value is converted to a bend value and set to a value BD and stored. Here, the bend value is a value indicating a pitch range expressed in units of cents, and, for example, 100 cents represents one semitone and 1200 cents represents one octave.

Next, in step S33, it is determined whether or not the bend value is 0, and when the bend value is not 0, that is, when a bend change request is made, the process proceeds to step S34 and the value BD is set to 100. The value obtained by rounding up the fractional part of the quotient divided by is set to the value D and stored. Then in step S35,
The value D is added to the event key code KC1 to set and store the value KC2.

In the following step S36, the note name of the stored key code KC2 is calculated and stored as NOTE2. In step S37, the chord RT, the chord type TP, and the note 2 are used, as in step S17 of FIG. Read the semitone data from the additional note table,
The values D1 and D2 are set and stored. Furthermore, step S
At 38, as in step S18 of FIG. 3, D1 and D2 are added to the key code KC2 to obtain values AD21,
It is stored as AD22.

In the following step S39, this AD21,
The above AD11 and AD12 are subtracted from AD22 and stored as values K1 and K2. Thus, the key depression sound is 1
When the number of semitones changes, the number of semitone changes of the two additional tones is stored as K1 and K2, respectively.

Next, in step S41, the bend value BD
Is set to the value DP1 and stored, and in the next step S41, it is determined whether or not the remainder obtained by dividing the value BD by 100 is 0, that is, whether or not the bend value of the key depression pitch is expressed in semitone units. . When the remainder is 0, the process proceeds to step S42, and (MDP1 + K1
The calculation result of (× 100) is set as the value DP2, and (MDP2 +
The calculation result of (K2 × 100) is stored as the value DP3.
Then, in step S43, the value AD21 is set to the value AD11, the value AD22 is set to the value AD12, and the value DP2 is set to the value MD.
The value DP3 is stored as the value MDP2 as P1. That is, the pitch deviation value from the original additional pitch of the additional pitch (hereinafter, simply referred to as the “previous additional pitch”) to the key-depression pitch in semitone steps immediately before the addition of the pitch deviation value is the value MDP1. , MDP2 is stored in cents, and the difference K between the immediately preceding additional pitch and the additional pitch as a result of bending is K.
1 and K2 are added in units of cents, and stored as values DP2 and DP3 as pitch deviation values of the additional sound.

On the other hand, if the remainder determined in step S41 is not 0, {MDP1 + (BD
The calculation result of mod 100) × K1} is stored as a value DP2, and the calculation result of {MDP2 + (BD mod 100) × K2} is stored as a value DP. Therefore, by changing the ratio of the bend value from the immediately preceding additional pitch by the difference K1, K2 between the immediately preceding additional pitch and the additional pitch as a result of bending, and adding to the pitch deviation value of the immediately preceding additional pitch, This means that the pitch deviation value of the current additional sound is being obtained. In the following step S45, the pitch deviations DP1 to DP3 are output to CH1 to CH3 of the tone generator 9, respectively, and the bend process is ended.

Further, in step S33, the bend value B
If D is 0, the process proceeds to step S46, and the pitch deviations DP1 to DP3, MDP1 and MDP2 are set to "0".
Is set and the process proceeds to step S42. That is, the bend value B
When D is 0, there is no demand for changing the bend, so the pitch shift output by the tone generator 9 is stopped.

As described above, according to this embodiment, when the bend is changed when the auto harmony function is used, the ratio of the pitch deviation of the additional sound to the key pressing sound is calculated to correct the bend amount of the additional sound. As a result, the additional sound continues to have a natural sound that matches the chord.

[0035]

As described above, according to the present invention,
A performance assisting device for adding an additional sound to a performance sound in accordance with a supplied chord, a pitch deviation information supplying means for supplying pitch deviation information, and a performance for controlling the pitch of the performance sound according to the pitch deviation information. Sound pitch control means, additional sound pitch deviation calculation means for calculating a pitch deviation of the additional sound based on the pitch deviation information, the chord, and the playing sound,
Since the additional sound pitch control means for controlling the pitch deviation of the additional sound by the additional sound pitch deviation is provided, even when the pitch bend is changed, the additional sound continues to generate a natural musical sound in harmony with the chord. The effect that becomes possible is produced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of an electronic musical instrument according to the present invention.

FIG. 2 is a diagram showing an example of an additional sound table stored in an additional sound table memory 8.

FIG. 3 is a flowchart of a main routine of this embodiment.

FIG. 4 is a flowchart of a subroutine of key event processing.

FIG. 5 is a flowchart of a subroutine of bend processing.

FIG. 6 is a flowchart of a bend processing subroutine.

FIG. 7 is a diagram illustrating a transition of each sound when a Bitch bend is applied to a key depression sound and an additional sound.

[Explanation of symbols]

1 keyboard 3 wheel (pitch deviation information supply means) 5 CPU (performance sound pitch control means, additional sound pitch deviation calculation means, additional sound pitch control means) 6 program memory 7 working memory 8 additional sound table memory

Claims (1)

[Claims] 1. A performance assisting device for adding an additional sound to a performance sound according to a supplied chord, comprising pitch deviation information supplying means for supplying pitch deviation information, and a performance sound corresponding to the pitch deviation information. Performance sound pitch control means for controlling the pitch, additional sound pitch deviation calculation means for calculating the pitch deviation of the additional sound based on the pitch deviation information, the chord and the performance sound, and the additional sound pitch deviation An electronic musical instrument comprising: an additional sound pitch control means for controlling pitch deviation.