JPS6267594A - Electronic musical apparatus with automatic accompanying function - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Kiwasu 1 relates to a 1-shiko musical instrument with an automatic accompaniment machine.

[Prior Art] Conventionally, some electronic musical instruments with an automatic accompaniment machine 1 obtain an additional sound such as an obbligado-like musical tone along with the automatic accompaniment. For the chord C whose root note is , the additional note is Ga, and for the chord Awl whose root note is pitch A4, the additional note ff is E5, and so on. Things are being realized.

[Problems with the prior art] However, even if it is the same chord, for example, when you specify domino and when you specify middo, the obbligado note (additional note) will naturally change due to the difference in the constituent notes of the chord. Although this is desirable, both chords have the same root note, and the obbligato note is always a constant 5th for this same root note, resulting in a lack of variation and a bland sound.

[Object of the Invention] This invention was made in view of the above-mentioned circumstances, and its purpose is to provide an automatic accompaniment a-toothed electronic musical instrument that can obtain optimal additional sounds according to the progression of bass notes and chords. It is about providing.

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention selects the pitch that is the pitch of the previously emitted additional note and has the smallest pitch difference among the pitches of each constituent note of the chord. At the same time, if the interval difference between the ball a and the pitch is within a predetermined value, the direction of change of the base tone is opposite, and the pitch with the least interval difference from the pitch of the additional H7 that was emitted last time is selected and emitted this time. The main point is that it is an additional sound.

[Configuration of First Embodiment] Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

Figure 1 shows the overall circuit of an electronic music base with an automatic accompaniment function. In the figure, 1 is a switch section. This switch section 1 includes a fingered switch that allows automatic accompaniment by holding down chords, and a fingered switch that allows automatic accompaniment by holding down chords. A one-finger switch that causes automatic accompaniment to be performed, a rhythm start/stop switch (none of which are shown), and the like that activates the wrist switch that starts automatic rhythm performance. Rhythm pattern data corresponding to the rhythm selected by this switch section l is read out from the rhythm pattern ROM 2 by the CPU 3,
A rhythm sound signal is supplied to the rhythm sound creation section, and the sound is emitted from the speaker 6 through the amplifier 5. Also! lW
The key information corresponding to the operation key of the section 7 is given by the CPU 3 to the chord determining section 8, a chord corresponding to this key information is determined, and this chord name information is sent to the tone creating section 10 along with the base pattern data from the base pattern ROM 9. A musical tone signal of an accompaniment tone is created and output from the speaker 6 through the amplifier 5.

The key code of each component note of the chord name information from the chord determination section 8 is preset in the working memory 11, and is set according to the program stored in the program memory 12.
C, PU3 determines that among the above key codes, it is different from the key code of the additional note emitted last time, and has the least pitch difference, and if this pitch difference is 3 degrees or more, the direction of change is opposite to the direction of change of the base note. , the key code with the smallest pitch difference from the previously emitted additional sound is selected, and this selected key code is given to the musical sound creation section 10, and is emitted from the speaker 6 via the amplifier 5 as an additional sound to the accompaniment sound. It will be done.

The working memory 11 is composed of a plurality of registers, as shown in FIG. The corresponding mode will be stored. Also, register BCB
There are eight F's, and the key code of each constituent note of the chord name information from the chord determination section 8 and the one of each key code are provided.
The octave or lower key code is preset respectively. Furthermore, the register CM stores the key code of the previously emitted additional sound, and the register MAC stores the key code of the additional sound emitted last time among the key codes in the eight registers BCBF. The highest key code among the low key codes is preset, and the register MIN is
Similarly, among the key codes in the eight registers BCBF, the one with the minimum pitch among the key codes higher in pitch than the key code of the previously emitted additional sound is preset.

In addition, the working memory 11 contains flags At and A2.
, B1. Flag registers B2 are also provided, and if the pitch difference between the key code of register CM and the selected key code immediately below the register MAC is 1 degree, flag AI is set, and if it is 2 degrees, flag A2 is set. , if the pitch difference between the key code of register CM and the selected key code immediately above the register MIN is 1 degree, flag Bl is set.
, 2 degrees, flag B2 is set, and if the pitch difference is 3 degrees or more, neither flag is set.

[Operation of the third embodiment] Next, the operation of this embodiment will be described.

Overall Process> When the power is turned on, the CPU 3 starts the main flow process shown in FIG. Namely.

The CPU 3 initializes each register of the working memory 11 (step AI), scans the six keys of the keyboard section 7 (
Step A2), if there is a change in the operating key, performs key code creation processing for the melody and accompaniment, which will be described later (steps A3 and A4).Next, the CPU 3 scans each switch of the switch section 1 (step A5). , if there is a change in the operation switch (step A6) and the rhythm start/stop switch is operated (state A7), the most significant bit of register RAFO is inverted (step A8),
If the one-finger switch is operated (step A9
), the 7th bit of register RAFO is inverted (step Al0), and when the fingered switch is operated (
Step A11), inverts the 6th bit of register RAFO. Step A12), if another switch is operated, inverts the corresponding bit of register RAFO (
Step Al3), storing the on/off state of each switch. If the most significant bit of the register RAFO is "1", the CPU 3 determines that the mode is for rhythm performance and accompaniment (step Al4), controls the rhythm performance and accompaniment (step A15), and registers If the most significant bit of RAFO is "0", rhythm performance and accompaniment are not performed, and the CPU 3 repeats the overall processing of steps A2 to A15 described above.

<Additional tone determination process> The melody and accompaniment key code creation process in step A4 described above is performed based on the flowchart of FIG. 4. Now, in the fingered mode, as shown on the right side of FIG. 5, after the additional tone of pitch C4 is emitted, F4. A4.
Assuming that the C4 key is pressed and the key corresponding to the chord name Fsai is pressed, and the bass note drops from pitch A3 to F3, the CPU 3 takes steps to create key codes for pitches F4, A4, and Cs. Bl), Step B2
If the 6th or 7th bit of register RAFO is rlJ, it is determined whether or not the automatic accompaniment mode is in effect.However, since the 6th bit of register RAFO is "1", step Proceed to B3. At this point, the operation key is in the accompaniment key range, so at step B4 and B5, press F4 above.
．． A4, C4 (7) Allocate a channel to each key code and perform sound generation processing.

Next, the CPU 3 determines the chord of F aaj from the contents of the operation key (step B6), and since the 6th bit of the register RAFO is "1", it knows that it is in the fingered mode in which all the chords are suppressed and automatic accompaniment is performed. In step B7), each key code of F4, A4, and C4 is preset in four registers BCBF in the order of the pitch of the pressed key, and the key codes of F5, As, and C5 of one octave L are preset in the remaining register BCBF. (Stella 7'B8.810). In this case, if it is in one-finger mode, the CPU 3 determines the Faaj chord from the lowest and the number of keys pressed, and sets the Fs, A of each constituent note.
After presetting the key code of s, C4 in register BCBF, Fs, As,
The key code of Cs is preset in the remaining register BCBF (steps B6, B7, and B9, BIO).

Next, the CPU 3 generates a Fa with a pitch lower than the C4 key code of the additional tone emitted last time, which is stored in the register CM.
, A4 key code is selected from the register BCBF (step B11), and the key code of A4, which has the highest pitch among them, is selected.
4 key code is preset in the register MAC (Step 2 B12), and the CPU 3 presets the previously emitted C4 additional sound in 99170M with the selected key code of A4 immediately below the above selected one in the register MAC. Pitch difference "3"
step B13), and in response to this, the CPU 3
is flag A1. A2 is turned off (step B14), and the CPU 3 selects Fa, which has a pitch higher than the key code of C4 of the additional tone emitted last time, which is stored in the register CM.
The key codes of A5 and C5 are selected from the register BCBF (step B17), and the key code of Fa, which has the lowest pitch among them, is preset in the register MIN (step B18), and the CPU 3 selects 99170.
Step 819) Detects the pitch difference "4th" between the previously emitted C4 additional note in M and the Fa selection key code immediately above the selected one in register MIN (step 819), and in response to this, CP
U3 is flag B1. Turn off B2 (step B20)
.

After that, the CPU 3 sets all flags A1. A2゜B1. Since B2 is turned off, 1. It is determined that the additional sound to be emitted this time has a pitch difference of 3 degrees or more above and below the previous additional sound (steps B23 and B24), and the bass sound drops from A3 to F3 as shown in FIG. (Step B25), the selection key code of Fa immediately above in the register MIN is transferred to the register CM (Step 826), thereby,
As shown in FIG. 6, an additional note of F4 whose change direction is opposite to that of the bass note is emitted together with the chord of F-j.

In this way, additional sounds corresponding to the bass sound and the chord progression are emitted.

In this case, if the direction of change of the bass note is in the rising direction, the CPU 3 transfers the selection key code immediately below in the register MAC to the register CM so that the change direction is the opposite.
Step B27), emit an additional sound.

Also, step B13. If the pitch difference between the key code of the additional sound emitted last time and the selected key code newly selected as the additional sound in B19 is "1 degree" or "2 degrees" which is less than "3 degrees", the CPU 3 sets flag A1. , Bl or flag A
2. Turn on B2 Step B15, BIB, B21,
B22), flag A1. from flags A2 and B2. Prioritize B1 in steps 823, B24, B28, B29)
, the selected key code with a small pitch difference is selected as the current kalo sound (steps B26 and B27).

In this way, the "difference in pitch" between the selected key code newly selected as the additional sound and the key code of the previously emitted additional sound is
If it is less than 2 degrees, regardless of the direction of change of the bass note, the one with the smaller pitch difference is selected and emitted as the additional note, and the additional note corresponds to the progression of the chord.

Further, if it is determined in step B2 that the mode is not in automatic accompaniment mode, or if it is determined in step B3 that the melody key range has been operated even in automatic accompaniment mode, the CP
U3 assigns a channel to the key code corresponding to the operating key and produces this as a melody sound (step B
30.831).

Thereafter, each time the specified code is switched, the switching is determined (step A4), and step B1-
The additional sound determination process of B51 is repeated (step A3).
, the additional notes are emitted one after another.In this case, when determining the additional notes, the range up to one octave is considered, so the key code with the pitch with the least pitch difference may exceed the range of one octave, and When the specified code is in the range one octave above, the key code preset in the register BCBF in step BIO is the key code one octave below.

[Second Embodiment] FIG. 7 shows a part of the flow of additional sound determination processing in the second embodiment, and this flow is a step of the flow of additional sound determination processing in the first embodiment shown in FIG. 823-B29
The rest is the same as the first embodiment.

In this embodiment, when the key code selected as a new additional note has the same pitch difference of "1 degree" or "2 degree" both above and below (steps C1 to C4), the change direction is opposite to that of the base note. The key code that makes the difference in pitch is "2 degrees" or less is selected as the additional note (steps C5 to C7). Otherwise, as in the first embodiment, if the pitch difference is "2 degrees" or less, the one with the smaller pitch difference is selected as the additional note. (Steps C8, C9, C6
, C7), if it is a "third" or higher, a key chord that changes in the opposite direction to the change direction of the base note is selected as an additional note (
Steps C1, C3, C5, C6, C7).

In this embodiment, even if the key code selected as a new additional note is less than 2 degrees compared to the key code of the previously emitted additional note, an additional note corresponding to the progression of the bass note and chord is emitted. It can make a sound.

In addition, in the above embodiment, the reason why the direction of change of the additional sound is reversed from the direction of change of the base sound is that the pitch difference related to the change of the additional sound is "
The pitch difference was 3 degrees or more, but the pitch difference could be greater or smaller than this.

Furthermore, although the additional tones are determined within the range of two octaves, the determination may be made within a range greater or less than this.

[Effects of the Invention] As mentioned above, with a device that produces an additional note with a fixed pitch difference from the root note, for example, in domino and mitsudo, the root note is the same, so it was not possible to change the additional note. In contrast, in the present invention, among the pitches of each constituent note of the chord, the pitch that is the pitch of the additional note emitted last time and has the smallest pitch difference is selected as the additional note to be emitted this time. , the additional note can be changed even for domino and mizdo, which have the same root note as mentioned above, and it is possible to obtain the optimal additional note according to the progression of the chord, as well as the additional note that has been emitted RFII times of the newly selected additional note. If the pitch difference is 11 or more, the direction of change of the base sound is opposite, and the pitch with the smallest pitch difference from the pitch of the previously emitted additional sound is selected as the additional sound to be emitted this time. Therefore, it is possible to obtain an optimal additional sound according to the progression of the bass sound, and it is possible to realize an even more excellent musical accompaniment.

[Brief explanation of drawings]

Figure 1 is an overall circuit diagram of an electronic musical instrument with automatic accompaniment function, Figure 2 is a diagram showing the details of the working memory 11, and Figure 3 is a diagram of the C
A flowchart diagram showing the main overall processing of PU3,
Figure 4 is a flowchart for determining additional sounds;
5 and 6 are diagrams showing how the additional note (obligado) changes according to the chord change, and FIG. 7 is a flowchart showing part of the process for determining the additional note in the second embodiment. This is a diagram. 1... Switch section, 3... CPU, 6
...Speaker, 7...Keyboard section, 8...
...Code determination section, i. ...Music sound creation section, 11...Working memory. Patent applicant Casio Computer Co., Ltd. Agent
Patent Attorney Machi 1) Masa Toshi 11', ,
), 1.・,1? Self J [======== Co Register BCEIF (F [==
====== Koren λri CM [======== Koren λri MAC [======
=CONN MATAYU'MIN 口 7lag A1 [==KO 77ri''A2 [=KO 77GUB1 0 7.GU.2 Amai7 Fmai Figure 6

Claims (1)

[Scope of Claims] Operation key information generation means for generating key information corresponding to an operation key; code name information generation means for generating code name information based on the key information from the operation key information generation means; and this code. The bass note information generating means generates bass note information based on the chord information from each information generating means, and the pitch of each constituent note of the chord related to the chord name information from the chord name information generating means, which was previously released. Select the pitch that corresponds to the pitch of the additional sound that was emitted and has the smallest pitch difference, and if the pitch difference is greater than or equal to a predetermined value, the direction of change of the previously emitted additional sound is Additional sound information generating means selects the pitch with the smallest pitch difference from the high pitch as the additional sound to be emitted this time; chord name information from the chord name information generating means; and chord name information from the bass sound information generating means. 1. An electronic musical instrument with an automatic accompaniment function, characterized in that it is equipped with a musical sound generation means for creating and emitting musical tones according to base sound information and additional sound information from the additional sound information generation means.