JPS6267593A - 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] [Technical field of invention] The present invention relates to an electronic musical instrument with an automatic accompaniment function.

[Prior Art] Conventionally, some electronic musical instruments with an automatic accompaniment function obtain an additional sound such as an obbligado-like musical tone along with the automatic accompaniment, and this additional sound is, for example, as shown in FIG. For example, if the chord C has pitch 04 as the root note, the additional note is Gs, and if the chord A has pitch A4 as the root note, the additional note is E5, and so on, the note is a fifth above the root note of the chord. A device that emits sound has been realized.

[Problems with the prior art] However, even if it is the same chord, for example, when you specify domino and when you specify mitsudo, the obbligato sound (additional note) is naturally different in the pronounced sound of the chord. Although change is desired, both chords have the same root note, and the obbligato note is always a constant 5th for this same root note, resulting in no change and a bland sound.

[Objective of the Invention J This invention was made in view of the above-mentioned circumstances, and its purpose is to provide an electronic musical instrument with an automatic accompaniment function that can obtain optimal additional sounds according to the progression of chords. be.

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention selects a pitch that is different from the pitch of the previously emitted additional note and has the smallest pitch difference from among the pitches of each constituent note of the chord. The main point is that this is the additional sound that will be emitted this time.

[Configuration of 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 musical instrument with an automatic accompaniment section. In the figure, 1 is a switch section. This switch section 1 includes a fingered switch that allows automatic accompaniment by holding chords, and a fingered switch that allows automatic accompaniment by holding 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 1 is read from the rhythm pattern ROM 2 by the CPU 3,
The rhythm signal is supplied to the rhythm sound creation section 4 to create a rhythm child signal, and the sound is emitted from the speaker 6 through the amplifier 5. Further, the key information corresponding to the operation key of the m-type section 7 is given by the CPU 3 to the chord determining section 8, and a chord corresponding to this key information is determined. A musical tone signal of an accompaniment tone is generated by the generating section 10, and is emitted 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 the previously emitted additional note among the key codes is preset by the CPU 3 according to the program stored in the program memory 12. The key code that is different from the key code and has the smallest pitch difference is selected, and this selected key code is given to the musical tone creation section 10 and sent to the speaker 6 via the amplifier 5.
The resulting sound is then output as an additional sound to the accompaniment sound.

The working memory 11 is composed of a plurality of registers as shown in FIG. The selected mode will be memorized. Also, register BCBF
There are eight key codes, and the key code of each 4Ii tone of the chord name information from the chord determining section 8 and the key code one octave above or below each key code are preset. Furthermore, the register CM stores the key code of the additional sound emitted last time, 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 maximum pitch among the key codes is preset and is stored in the register MIN.

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.

[Operation of the 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. That is, the CPU 3 initializes each register of the working memory 11 in step AI.
), scans the six keys of the keyboard section 7 (step A2),
If there is a change in the operating key, key code generation processing for melody and accompaniment, which will be described later, is performed (steps A3 and A4). Next, the CPU 3 scans each switch in the switch unit 1 (step A5), and if there is a change in the operation switch (step A6) and the rhythm start/stop switch is operated (step A7), the CPU 3 scans each switch in the switch unit 1 (step A5), and if there is a change in the operation switch (step A6) and the rhythm start/stop switch is operated (step A7), the topmost register RAFO is scanned. If the bit is inverted (Step 88), and the one-finger switch is operated (Step A9), register RAF
If the 7th bit of O is inverted (Step Al0), and the fingered switch is operated (Step A11), the 6th bit of register RAFO is inverted (Step A12).
), if another switch is operated, the corresponding bit in the register RAFO is inverted (step A13), and the on/off state of each switch is stored. CPU3
If the most significant bit of register RAFO is "1", then
It is determined that the mode is in which accompaniment is performed along with rhythm performance (step A14), and the rhythm performance and accompaniment are controlled (step A15). If the most significant bit of register RAFO is "0", rhythm performance and accompaniment are performed. is not carried out. Thereafter, the CPU 3 repeats the entire process of steps A2 to A15 described above.

Additional Note 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 in FIG. 5, after emitting the additional tone of pitch E4, Ca, B4,
Gs, Bs keys are pressed and the keys corresponding to the chord name C5ai+ are pressed, Surto, CP 03 Lf The above pitches C4, E4. Step B1) to create the key code for G4゜B4, proceed to step B2 and register RAF.
If the 6th or 7th bit of O is "1", it is determined whether or not the automatic accompaniment mode is in effect.
Since the 6th bit of FO is rlJ, the process proceeds to step B3. Here, since the operating key is in the accompaniment area, the above Cs is entered in steps B4 and B5.

Channels are assigned to each key code of B4, G4, and Ba, and sound generation processing is performed.

Next, the CPU 3 determines the chord of C5aj7 from the contents of the operation keys (step B6), and since the 6th bit of the register RAFO is rlJ, it determines that the mode is in the fingered mode in which all chords are held down and automatic accompaniment is performed (step B6). B7), the above Ca, Ea, G4. 4 registers B in the order of pitch of the key that pressed each key code of B
CBF, and preset the key codes of Cs, Es, Gs, and Bs one octave higher in the remaining register BCBF (steps B8 and B10). In this case, if it is in one-finger mode, the CPU 3 Determine the chord of C□j1 from the number of keys pressed, preset the key codes of Cs, Es, Gs, and Bs of each constituent note in the register BCBF, and then select the key codes of C5, Es, Gs, and B5, which are also one octave higher. Preset the key code in the remaining register BCBF (step B6,
B7, B9, B10).

Next, the CPU 3 selects the 04 key code from the register BCBF, which has a pitch lower than the B4 key code of the previously emitted additional sound stored in the register CM (step B11), and selects the 04 key code from the register BCBF. Step B: Preset the high C4 key code to the register MAC.
l 2), and the pitch E stored in the register CM.
G4, which has a higher pitch than the key chord of 4. B4 and more l
The key codes of Cs, Es, G5, and BS on the octave are also selected from the register BCBF (step B13), and the key code of G4, which has the lowest pitch, is preset in the register MIN (step B14).
), and the CPU 3 selects the additional sound of pitch E4 that was emitted last time in register CM, the selection key code of 04 immediately below the selected one in register MAC, and the selection key code of 04 immediately below the selected pitch in register MIN, and In step B15), it is determined that the pitch difference between pitch E4 and pitch 64 is smaller than the pitch difference between pitch E4 and pitch 04. Then, the key code 04 in the register MIN is transferred to the register CM. As a result, as shown in FIG. 5, the additional tone of G4 is emitted along with the chord of CaaJr.

In this way, additional sounds are emitted in accordance with the progression of the chord.

In step B15, if the pitch difference between the key code and the selected key code immediately below is smaller, the key code in the register MAC is transferred to the register CM, and the additional sound is emitted. In addition, if it is determined in step B2 that the mode is not in automatic accompaniment mode, or in step B3
If it is determined that the melody key area has been operated even in the automatic accompaniment mode, the CPU 3 allocates a channel to the key code corresponding to the operated key, and causes this to be sounded as a melody sound (step 818.B19).

Thereafter, each time the specified code is switched, the switching is determined (step A3), and step B1-
The additional sound determination process of B19 is repeated (step A4).
, as shown in Figure 5, the additional tones are emitted in sequence. In this case, when determining the additional tones, the range up to one octave is considered, so the key code of the pitch with the least pitch difference is within one octave. If the specified code is within the range of one octave, the key code preset in the register BCBF in step BIO is a key code one octave lower.

In the above embodiment, the additional tones were determined within a range of two octaves, but the determination may be made within a range greater than or equal to this.

[Effects of the Invention] As mentioned above, with a device that produces an additional note with a fixed pitch difference to the root note, for example, the root note of domino and mitzdo is the same, so it is 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 different from the pitch of the additional note emitted last time and has the smallest pitch difference is selected, and the additional note to be emitted this time is selected. Therefore, even with the same root notes as domino and mitsudo, the added notes can be changed, and the optimal additional note can be obtained according to the progression of the chord, resulting in an even more excellent musical accompaniment. It has the following effects:

[Brief explanation of drawings]

FIG. 1 is an overall circuit diagram of an electronic musical instrument with an automatic accompaniment unit, FIG. 2 is a diagram showing the specific configuration of the working memory 11, FIG. 3 is a flowchart showing the main overall processing of the CPU 3, and FIG. 5 is a diagram showing a flowchart for determining an additional note, FIG. 5 is a diagram showing a state in which an additional note (obligado) changes according to a change in a chord, and FIG. 6 is a diagram showing a conventional example. 1... Switch section, 3... CPU, 6
...Speaker, 7...Keyboard section, 8...
...Chord judgment section, 10...Music tone creation section,
11... Working memory. [=======] Wλri BCI3F co) Register theft・77ri.

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. Among the pitches of each component note of the chord related to the chord name information from the name information generating means, the pitch that is different from the pitch of the additional note emitted last time and has the smallest pitch difference is selected and emitted this time. additional sound information generation means for generating additional sounds; and musical sound generation means for creating and emitting musical sounds according to the chord name information from the chord name information generation means and the additional sound information from the additional sound information generation means. An electronic musical instrument with an automatic accompaniment function, comprising: