JPH0225514B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an accompaniment sound generation device for an electronic musical instrument,
In particular, it forms notes that have a predetermined pitch relationship with the notes of a specific key pressed down on the accompaniment keyboard (for example, the notes of the highest key), and these formed notes are combined with the notes of the pressed keys to accompany accompaniment notes (chord notes or arpeggios). It relates to a device that produces sounds (sounds). Generally, in an accompaniment sound generation device for an electronic musical instrument, when playing a chord, the sound of a key pressed on an accompaniment keyboard is produced either as is or by playing it at a predetermined rhythm. Furthermore, in the arpeggio performance, the tones of the keys pressed on the accompaniment keyboard and the tones in an octave relation to the tones are sequentially selected and produced. However, since there are limits to the keypressing operations performed by performers, especially by beginners, the chord performance sounds and arpeggio performance sounds described above are also limited, and these accompaniment sounds do not necessarily match the performer's intentions. It wasn't always possible to get a rich, deep sound. In view of the above-mentioned circumstances, it is an object of the present invention to provide an accompaniment sound generation device for an electronic musical instrument that can produce rich and deep chord tones, arpeggio tones, and other accompaniment sounds by simple key operations. According to this invention, the interval between two predetermined constituent tones (for example, two notes on the treble side) of a plurality of key information indicating each constituent tone of a chord formed and generated in response to a key press on an accompaniment keyboard. At the same time as finding the pitch relationship of the key information, select the key information corresponding to a specific constituent note (for example, the highest note) from the same plurality of key information, and based on this selected key information, Key information indicating additional notes having the pitch relationship obtained above is further formed, and accompaniment notes such as chord notes or arpeggio notes are generated based on the key information indicating each constituent note and additional note of the formed chord. ing. Further, according to the present invention, when forming key information indicating an additional note having a predetermined pitch relationship with respect to a specific constituent note among a plurality of pieces of key information indicating each constituent note of the chord, an appropriate means is used in advance. to specify a performance key through the scale, and correct the predetermined pitch relationship based on the specified performance key so that the additional note does not deviate from the scale of the specified performance key;
Key information indicating the additional sound is generated based on this corrected pitch relationship. DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an accompaniment sound generation device for an electronic musical instrument according to the present invention will be described in detail with reference to embodiments of the accompanying drawings. FIG. 1 shows an embodiment of an electronic musical instrument to which an accompaniment sound generation device according to the present invention is applied. In the accompaniment sound generation device of this embodiment, accompaniment sound generation is controlled by various timing signals φ, SY, H1, H2, T1 to T8, T1', and T8' generated from a timing signal generator 20. These timing signals φ, SY, H1, H2, T1
~T8, T1', and T8' are shown in a timing chart as shown in Figure 2b~. In addition, the timing charts in Figures 3A and B are for accompaniment keyboard 1, C ₂ keys,
This figure shows the operation of the accompaniment sound generator shown in FIG. 1 when the _E2 key and the _G2 key are pressed.
Below, referring to these timing charts, the first
The electronic musical instrument shown in the figure will be explained. In FIG. 1, the key press detection circuit 2 receives the clock pulse φ and the synchronization signal shown in FIGS. 2b and 2c.
SY, it sequentially and repeatedly scans each key of the accompaniment keyboard 1 from the bass side to the treble side, and outputs a key time division signal KTDM indicating the state of each key. Figure 2a shows the time-division time slots related to this key scanning, and time slot ``0'' is the synchronizing signal SY (Figure 2c, Figures 3A, c,
3B and 3C) indicate the assigned time slots, and time slots "1" to "49" indicate the time slots corresponding to each key. Time slots “0” to “49” are key scan 1
Repeated every scan cycle. In this embodiment, the accompaniment keyboard 1 has C <sub>2</sub> keys ~
It is assumed that there are <sub>6</sub> C keys, a total of 49 keys. The key time division signal KTDM becomes "1" in the time slot corresponding to the pressed key, and becomes "0" in other time slots. For example, to specify the chord "C major" on accompaniment keyboard 1,
Assuming that three keys, the C <sub>2</sub> key, the E <sub>2</sub> key, and the G <sub>2</sub> key, are pressed, the key press detection circuit 2 detects the ``1'' value in the 1st time slot, the 5th time slot, and the 8th time slot, respectively. A key time division signal KTDM as shown at n in FIGS. 3A and 3B is output. The counter 3 is a modulo 49 counter that repeatedly counts from "0" to "49" based on the clock pulse φ and the synchronizing signal SY, and outputs this counted value as a 6-bit code signal KC.
This code signal KC is applied to the additional sound data creation circuit 4 and the A input of the selector 5. Note that the code signal KC is transmitted to the key press detection circuit 2.
It is synchronized with the key time division signal KTDM output from the accompaniment keyboard 1, and its values "1" to "49" correspond to each key of the accompaniment keyboard 1, respectively. This situation is shown in Figure 3A.
and B timing chart a. Now, the apparatus shown in FIG. 1 is configured to perform the first key scan performed by the key press detection circuit 2 on the accompaniment keyboard 1, that is, the time when the first processed signal H1 shown in FIG. (hereinafter referred to as the first processing cycle), and the second key scan performed by the key press detection circuit 2 on the accompaniment keyboard 1, that is, the second key scan shown in FIG.
The formation of key information corresponding to the accompaniment tones to be generated is controlled using two cycle times during which the processing signal H2 becomes "1" (hereinafter referred to as the second processing cycle) as one operation unit. That is, in the first processing cycle, key information corresponding to the pressed key on the accompaniment keyboard 1 is formed and stored, and in the second processing cycle, an additional tone having a predetermined pitch relationship with a specific key of the pressed keys is formed and stored. Form and store key information. Then, accompaniment sounds are generated based on the stored key information. Below, for each processing cycle mentioned above,
The detailed operation of the accompaniment sound generating device shown in FIG. 1 will be explained. In this embodiment, the key indicating the highest tone is used as the specific key among the pressed keys. Initially, in the first processing cycle, the signal H1
is "1", so the selector 5 is in the A input selection state, AND circuits A1 and A3 are in the operable state,
The selector 45 of the additional sound data creation circuit 4 is in the A input selection state, and also the AND circuits A41 and A42.
becomes operational. In this state, the code signal KC output from the counter 3 is passed through the selector 5 to the decoder 6.
is added to the accompaniment keyboard 1 by the decoder 6.
After being decoded into a 49-bit signal corresponding to each key, it is added to the key information temporary memory 7. On the other hand,
Key time division signal output from key press detection circuit 2
KTDM (see FIG. 3A, n) is applied to the load terminal L of the key information temporary memory 7 via the AND circuit A1 and the OR circuit 2. The key information temporary memory 7 is composed of 49 AND circuits corresponding to each key of the accompaniment keyboard 1 and 49 flip-flops to which the outputs of the AND circuits are respectively applied to the set terminal S. The output signal of the decoder 6 is supplied to each input, and the signal applied to the load terminal L is commonly supplied to the other input. Therefore, the output of the decoder 6 is stored in the flip-flop at the timing when the key time division signal KTDM becomes "1" (the corresponding flip-flop is set). In this way, the key information temporary memory 7 stores the output of the decoder 6 (hereinafter referred to as key information) corresponding to the key pressed on the accompaniment keyboard 1 in the first processing cycle. As an example of the operation of the temporary key information memory 7, the timing chart p in FIG. 3A shows a case where the keys pressed are the _C2 key, the _E2 key, and the _G2 key. Note that a synchronizing signal SY is commonly applied to the reset terminal R of each of the flip-flops through the AND circuit A3 and the reset terminal RS of the key information temporary memory 7, and the stored contents of each of the flip-flops are stored in the first processing. It is reset at the timing of the synchronization signal SY at the beginning of the cycle. In addition, the code signal output from counter 3
KC is the selector 45 of the additional sound data creation circuit 4
to latch L42. Latch L4
A key time division signal KTDM outputted from the key press detection circuit 2 is applied to the load terminal L of No. 2 via an AND circuit A42 and an OR circuit 42. Therefore, latch L42 receives the key time division signal KTDM.
The code signal KC is latched every time KC becomes "1". In the end, the latch L42 contains the code signal KC, which corresponds to the time slot in which the key time division signal KTDM becomes "1" at the end in the first processing cycle.
That is, the code signal KC corresponding to the highest note of the pressed keys on the accompaniment keyboard 1 is latched.
This code signal KC is added to the adder 44 as the highest key code signal MKC. Taking the above-mentioned example in which the three keys _C2 , _E2 , and _G2 are pressed, the code signal KC indicating "1" corresponding to the _C2 key is latched. , then a code signal KC indicating "5" corresponding to the E ₂ key is latched, and finally a code signal KC indicating "8" corresponding to the G ₂ key is latched. is added to the adder 44 as the highest key code signal MKC (see Aq in FIG. 3). Further, the key time division signal KTDM is ANDed with the clock pulse φ by an AND circuit A41, and the output of this AND circuit A41 is fed to the counter 41.
is applied to the initial set terminal IS of the latch L41 and the load terminal L of the latch L41. Here, counter 4
1 is set to ``1'' corresponding to the decimal number every time the signal applied to the initial set terminal IS changes from ``1'' to ``0'', and then set to ``2'' based on the falling timing of the clock pulse φ.
It is a counter that sequentially counts "3"...
An example of the operation of this counter 41 when the C ₂ key, E ₂ key, and G ₂ key are pressed is shown in the timing chart r of FIG. 3A. Furthermore, the latch L41 latches the counting output of the counter 41 mentioned above at the rising timing of the signal applied to the load terminal L from "0" to "1", and the output of the AND circuit A41 rises to "1". every time it goes up, i.e. key time division signal
Each time KTDM becomes "1", the count output of the counter 41 at that time is latched. For example, in the case of the previous key press example (C ₂ key, E ₂ key, G ₂ key), the latch L41 is activated at each timing corresponding to the C ₂ key, E ₂ key, G ₂ key of the key time division signal KTDM. The count output of the counter 41 is latched, and the content of the latch L41 becomes the value "3" at the 8th time slot corresponding to the _G2 key.
(See Figure 3A). By the way, as is clear from the timing charts r and s shown in FIG. 3A, the latched count output of the counter 41 is based on the key time division signal.
This is the count content ("3") between the last two time slots (in the example of FIG. Contents (“3”)
is the key pressed on accompaniment keyboard 1 (C ₂ keys, E ₂ keys, G ₂ keys)
It corresponds to the interval (pitch) between the key corresponding to the highest note (G ₂ key) and the key immediately below it (E ₂ key). The output (data ID) of this latch L41 is applied to the A input of the selector 43. Further, the output (data SD) of the frequency data generation circuit 42 is added to the B input of the selector 43. The selector 43 selects the above data ID by turning the switch S on or off.
Or select SD. In other words, Switch S
is a switch for selecting whether the number of tones of the sound created as an additional sound by the accompaniment sound generating device according to the present invention is determined by the manner in which the keys are pressed on the accompaniment keyboard 1, or whether it is set to a preset degree. and
When the switch S is turned on, a signal "1" is applied to the A input selection terminal SA of the selector 43, and the output (data ID) of the latch 41 is selected.
Also, if switch S is turned off, the inverter
A signal "1" is applied to the B input selection terminal SB of the selector 43 via INV, and the output (data SD) of the frequency data generation circuit 42 is selected. The data ID selected by these selectors 43 or
SD is added to adder 44. The adder 44 adds the data ID to the highest key code signal MKC output from the latch L42.
or add SD to form a code signal corresponding to the additional sound. However, in the following explanation, a case will be explained in which the switch S is in the on state. Therefore, in this case, the adder 44 adds the highest key code signal MKC and the data ID, and adds the highest key code signal MKC and the data ID.
The first additional note code signal AKC1 indicating the additional note of
(MKC + ID; in the example of Figure 3 A and B, "8" +
"3" = "11") is formed. Next, the operation in the second processing cycle will be explained. When the second processed signal H2 becomes "1", the selector 5 is in the B input selection state, the AND circuits A2, A4 and A5 are in the operable state, and the additional sound data creation circuit 4
The selector 45 is in the B input selection state, and the AND circuit A43 is also in the operable state. Furthermore, in the second processing cycle, the timing signal generator 2
Timing signals T1 to T8 output from 0 and
Various controls described below are performed based on T1' and T8' (see FIG. 2 f). Here, the above signal
T1 to T8 are generated sequentially at arbitrary time slot intervals (in this example, for convenience, 5 time slot intervals are used) within one scanning cycle of the aforementioned time-division time slots (see Figure 2a). It's a signal. Further, the above signal T1' is used when forming a chord tone, and is delayed by a predetermined number of time slots from the above-mentioned timing signal T1 (but before the timing signal T2 is generated).
The signal T8' is used to form an arpeggio sound, and is generated a predetermined number of time slots later than the timing signal T8 (but before the start of the next scan cycle). be. In the second processing cycle, the additional sound data creation circuit 4 includes an adder 44, a delay flip-flop DF42, a selector 45, and a latch L42.
A loop consisting of is constructed. The operation of this loop is as follows: latch L42 is connected to load terminal L by OR circuit 4.
1. It is controlled by timing signals T1 to T7 applied via an AND circuit A43, a delay flip-flop DF41, and an OR circuit 42. That is, before the timing signal T1 is applied, the first additional key code signal AKC1 ("11" in the example of FIGS. 3A and B) formed in the previous first processing cycle is output from the adder 44. This first additional tone key code signal AKC1 is applied to the selector 5, and is also applied to the latch L42 via the delay flip-flop DF42 and the selector 45. Therefore, when the timing signal T1 is delayed by one time slot by the delay flip-flop DF41 and applied to the load terminal L of the latch L42, the first additional key code signal AKC1 is applied to the load terminal L of the latch L42.
The signal is latched at 2 and added to the adder 44 again.
Therefore, in the adder 44, this signal AKC1 ("11")
and the data added from the selector 43
ID (“3”) and the second additional tone key code signal AKC2 (AKC1+ID; “11”+
"3" = "14") is output. This second additional tone key code signal AKC2 is applied to the selector 5 in the same way as the first additional tone key code signal AKC1 described above, and is also applied to the latch L42 via the delay flip-flop DF42 and the selector 45. As a result, immediately after the timing signal T2 is generated, the adder 44 outputs the third additional tone key code signal AKC3 (AKC2+ID; "14"+"3"="17"). Thereafter, such an operation is repeated, and every time the timing signals T3 to T7 are generated, a fourth additional tone key code signal AKC4 (AKC3+ID; "17"+"3" indicating the fourth to eighth additional tones) is generated. = "20")
~8th additional key code signal AKC8 (AKC7+ID;
"29" + "3" = "32") is formed and output from the adder 44 (timing chart u and v in FIG. 3B).
reference). Note that by providing a delay flip-flop DF42 between the adder 44 and the latch L42, the newly formed additional tone code signals (AKC1 to AKC1) output from the adder 44 are
AKC7) is latched in order and securely into latch L42. Now, the additional sound key code signals AKC1~ which are sequentially output from the adder 44 of the additional sound data creation circuit 4.
The AKC8 (see Fig. 3 Bv) is applied to the decoder 6 via the selector 5, and is decoded by the decoder 6 into a 49-bit signal corresponding to each key of the accompaniment keyboard 1. added to memory 7. However, in this case, among the 49-bit signals mentioned above, only the bit signals corresponding to the keys indicated by the additional tone key code signals AKC1 to AKC8 become "1", and
In this second processing cycle, the timing signal is applied to the load terminal L of the key information temporary memory 7.
Since T1 to T8 are added via the OR circuit 1, AND circuit A2 and OR circuit 2, the key information temporary memory 7 receives the timing signal T1.
~Additional key code signal AKC1 every time T8 occurs
~The output of the AND circuit corresponding to the key indicated by AKC8 becomes “1” (key information corresponding to the additional sound),
Flip-flops corresponding to the AND circuits are sequentially set. Therefore, the timing signal in the second processing cycle is stored in this key information temporary memory 7.
When T8 occurs, the pressed key on accompaniment keyboard 1 that was memorized in the previous first processing cycle (in this example
In addition to the key information corresponding to C ₂ keys, E ₂ keys, G ₈ keys),
Furthermore, the 1st additional note to the 8th additional note (A# ₂ keys, C# ₃ keys,
Key information corresponding to each of the _E3 key..., _G4 key) is stored (see Fig. 3 Bw). The respective key information stored in this temporary key information memory 7 is then applied to latch L1 and latch L2. The latch L1 performs a latch operation based on the timing signal T1' applied via the AND circuit A4. In this embodiment, the timing signal T1' forms the key information corresponding to the first additional tone mentioned above. Since it is generated after the timing signal T1 related to storage, the pressed keys (C ₂ keys, E ₂ keys, G ₂ keys) on the accompaniment keyboard 1 stored in the key information temporary memory 7 in the first processing cycle Key information corresponding to and timing signal in the second processing cycle
The key information corresponding to the first additional note (A# ₂ key) stored in the temporary key information memory 7 at the time of occurrence of T1 is latched, and the chord note information CD (49 keys corresponding to each key of the accompaniment keyboard 1) is latched. This is information consisting of key information (only the key information latched in the latch L1 becomes "1", and the other key information becomes "0") and is added to the chord tone forming circuit 11 (see FIG. 3, Bx). Furthermore, the latch L2 performs a latch operation based on the timing signal T8' applied via the AND circuit A5. In this embodiment, the timing signal T8' corresponds to the keys corresponding to the first to eighth additional tones. Since it is generated after the timing signals T1 to T8 related to the formation and storage of information, the pressed keys (C ₂ keys, E ₂ keys) on the accompaniment keyboard 1 stored in the key information temporary memory 7 in the first processing cycle , G ₂ key) and all of the first to eighth additional tones (A# ₂ key, C# ₂ key, E ₃ key, G ₃ keys, A# ₃ keys, C#
₄ keys, E ₄ keys, G ₄ keys), and arpeggio sound information AD (accompaniment keyboard 1).
This information consists of 49 pieces of key information corresponding to each key, and is added to the arpeggio sound search circuit 10 as (only the key information latched in the latch L2 becomes "1" and the other key information becomes "0"). . Here, the arpeggio sound search circuit 10 and related peripheral circuits will be explained. The accompaniment pattern generator 8 stores a plurality of accompaniment patterns corresponding to various rhythms, and generates an arpeggio tone generation timing signal AT, a chord tone generation timing signal CT, and a chord tone generation timing signal CT based on a pattern selected by an appropriate pattern selection switch (not shown).
Outputs arpeggio mode control signal MC and arpeggio initial reset signal IR. Here, the arpeggio sound generation timing signal AT
is a signal indicating the generation timing of the automatic arpeggio sound, and is applied to the reset terminal R of the flip-flop F1 via the differentiator 15, and is also applied to the arpeggio sound forming circuit 12. Further, the chord tone generation timing signal CT is a signal indicating the generation timing of the automatic chord tone, and is applied to the chord tone forming circuit 11. The arpeggio mode control signal MC is a signal that controls whether automatic arpeggio sounds are generated in order from the low note side or from the high note side, and is applied to the mode control terminal U/D of the U/D (up/down) counter 9. , the arpeggio initial reset signal IR is a signal that becomes "1" only at the initial point of every selected automatic arpeggio pattern, and is applied to the reset terminal R of the U/D counter 9. Further, the U/D counter 9 counts from "1" to "49" based on the clock pulse φ.
Mode control signal applied to mode control terminal U/D
If MC is “1”, “1”, “2”…, “49”
If the signal MC is "0", it counts down as "49", "48", etc., "1". Also, each time the initial reset signal IR applied to the reset terminal R becomes "1", the above count value becomes "0".
becomes. Count signal U/D of this U/D counter 9
C is added to the arpeggio sound search circuit 10. As shown in FIG. 4, for example, the arpeggio sound search circuit 10 includes a decoder 101 that decodes the count signal U/DC described above into a 49-bit signal corresponding to the count value of the U/D counter 9; It is composed of 49 AND circuits A101 to A149 that each take an AND condition between each output signal of and the arpeggio sound information AD described above, and an OR circuit 101 that takes an OR condition for the signals output from these AND circuits A101 to A149. be done. That is, in this arpeggio sound search circuit 10, the count signal U/D C of the U/D counter 9
When the arpeggio sound information AD output from the latch L2 is sequentially scanned from the treble side to the bass side or from the bass side to the treble side based on The detected AND circuit (A101 to A149)
The output signal "1" (key information of the note to be produced as an arpeggio sound) is applied to the arpeggio sound forming circuit 12, and at the same time, this signal "1" is applied to the OR circuit 10.
1 as a detection signal KD, which is differentiated by the differentiator 16 and applied to the set terminal S of the flip-flop F1. The flip-flop F1 is set and outputs the signal "1" every time the detection signal KD rises to "1", and is reset and outputs the signal "1" every time the arpeggio sound generation timing signal AT rises to "1". 0” is output. This flip-flop F1
The output signal of is applied to the stop terminal stp of the U/D counter. Therefore, the U/D counter 9 stops counting every time the flip-flop F1 is set, and starts counting every time it is reset. As a result, in the arpeggio sound search circuit 10 described above, the scanning is performed when the arpeggio sound generation timing signal AT rises to "1", and the arpeggio sound information AD output from the latch L2 is based on this arpeggio sound. In the sound search circuit 10, an arpeggio sound generation timing signal
Each time an AT occurs, they are sequentially selected one by one and added to the arpeggio sound forming circuit 12 as an arpeggio sound production key film AD ^* . Now, the chord tone forming circuit 11 to which the chord tone information CD output from the latch L1 described above is added corresponds to the tone of the pressed key on the accompaniment keyboard 1 and the first additional tone based on the chord tone information CD. At the same time, the sound source signal is subjected to open/close envelope control in accordance with the chord sound generation timing signal CT applied from the accompaniment pattern generator 8, thereby forming a musical sound signal indicating an automatic chord sound. In addition, the above-mentioned arpeggio sound pronunciation key information AD ^*
The arpeggio sound forming circuit 12 to which the arpeggio sound is added forms a sound source signal corresponding to one of the arpeggio constituent sounds (the sound of the pressed key and the first to eighth additional sounds) based on the information AD ^* . Opening/closing envelope control of the sound source signal is performed according to the arpeggio sound generation timing signal AT to form a musical tone signal indicating an automatic arpeggio sound. The musical tone signals representing the automatic chord tones and the musical tone signals representing the automatic arpeggio sounds formed in this way are synthesized at arbitrary levels in the mixing circuit 13 and added to the sound system 14 as automatic chord tones and automatic arpeggio sounds. pronounced. However, the constituent notes of the automatic chord tones that are sounded are the keys pressed on accompaniment keyboard 1 (C ₂ keys, E ₂ keys, G _{2 keys)} .
( ₂ keys C, ₂ notes E, ₂ notes G) and the first additional note ( ₂ notes A#), and the constituent notes of the automatic arpeggio note are also the keys pressed on accompaniment keyboard 1 (C2 note). ₂
key, E ₂ keys, G ₂ keys) tones (C ₂ notes, E ₂ notes, G ₂ notes) and the 1st to 8th additional notes (A# ₂ notes, C# ₃ notes, E ₃ notes)
It is clear from the previous explanation and the timing chart x and y in FIG. 3B that the following three sounds are produced: G note, G note ₃ , A# note ₃ , C# note ₄ , E note ₄ , G note ₄ . Then, in the first processing cycle again, a signal "1" is output from the AND circuit A3 which inputs the synchronization signal SY and the first processing signal H1, and the signal "1" is output.
is added to the reset terminal RS of the temporary key information memory 7, all the flip-flops in the temporary key information memory 7 are reset once, and the first flip-flop is reset again.
A set (storage) operation based on a processing cycle and a second processing cycle is initiated. Further, in each circuit after latch L1 and latch L2, the above-described operations are repeated based on the new storage contents of the key information temporary memory 7. By the way, when the switch S is turned off and the B input of the selector 43 in the additional sound data creation circuit 4 is selected, the data indicating the preset number of tones outputted from the frequency data generation circuit 42
The SD is added to the adder 44, and the above-mentioned first to eighth additional tones are ones that are sequentially shifted to the treble side by the pitch indicated by the data SD from the highest pressed key on the accompaniment keyboard 1. becomes. The electronic musical instrument shown in FIG. 1 operates in an automatic chord performance mode in which the chord tone forming circuit 11 is controlled to open and close its envelope according to the chord tone generation timing signal CT applied from the accompaniment pattern generator 8 to the chord tone sound source signal. However, an appropriate changeover switch is provided to cut off the chord sound generation timing signal CT, and instead, a signal related to key presses on the accompaniment keyboard 1 is used to open and close the envelope of the sound source signal. Of course, a circuit configuration corresponding to the manual chord performance mode to be controlled may also be used. Furthermore, the eight timing signals T1 to T8 generated from the timing signal generator 20 determine the number of arpeggio constituent notes to be produced, and the timing signals are adjusted according to the desired number of arpeggio constituent notes. The number can also be increased or decreased as appropriate. Furthermore, the signal T2 is used instead of the timing signal T1'.
Assuming that the signal T2' is generated with an appropriate delay from the generation of the signal T2', or the signal T3' is generated with an appropriate delay from the generation of the signal T3, and is added to one input of the AND circuit A4, the addition The number of chord constituent notes played can also be increased to two or three... FIG. 5 shows another embodiment of the additional sound data creation circuit 4 shown in FIG. In the additional sound data creation circuit 4 shown in FIG. ~8th additional note) may become a non-diatonic note that deviates from the scale note (diatonic note). Therefore, in the additional sound data creation circuit 40 shown in FIG. 5, in order to prevent the additional sound from becoming a non-diatonic sound, the performance key is specified in advance, and the data ID is set based on the specified key. or
It is designed to correct SD. That is,
When the additional sound formed is a non-diatonic sound, the data ID or SD is changed so that the additional sound becomes a diatonic sound immediately above the non-diatonic sound (on the high-pitched side). be. However, the additional sound data creation circuit 4 shown in FIG.
0, circuits that are the same as the additional sound data creation circuit 4 shown in FIG. First, the key specifying device 401 that specifies the above-mentioned performance tone will be explained. This key specifying device 401 includes 12 key selection switches corresponding to the key of C to B, respectively, and a changeover switch for switching between major scale and minor scale. By specifying one of them and turning on any one of the key selection switches as appropriate, the key data TD corresponding to the specified scale and the turned on key selection switch is output. This tone data TD is applied to frequency data generation RM403 and interval data correction control RM404. In addition, instead of the 12 key selection switches mentioned above,
Before a performance, a key corresponding to a desired key name may be pressed on the accompaniment keyboard 1, and the note name data of the pressed key may be latched and utilized. Next, when an arbitrary key is pressed on the accompaniment keyboard 1 (see Figure 1), a key time division signal related to the pressed key is generated.
KTDM is applied to the AND circuit A42, and at the end of the first processing cycle, the highest note key code signal MKC indicating the highest note of the pressed keys is latched in the latch L42, and the key time division signal KTDM is applied to the AND circuit A42. In addition to this, a numerical value corresponding to the interval (pitch) between the highest note of the pressed keys and the next highest note is latched in latch L41 during the additional sound data creation described above. This is similar to the case of circuit 4. However, in this additional sound data creation circuit 40, the highest note code signal MKC latched in the latch L42 is added to the adder 44 and also added to the frequency data generation RM.
403 and interval data correction control RM
404 and latched in latch L41, the data ID corresponding to the interval is applied to interval data correction control RM404 and data correction circuit 405. Here, the interval data correction control RM 404 and data correction circuit 405 to which the data ID is added will be explained. The interval data correction control ROM 404 is
There are 24 tables as shown in Table 1 (performance key C ~
12 tables corresponding to the major scale of B and 12 tables corresponding to the minor scale of performance keys C to B. Of these tables in Table 1, C
This is a ROM (read only memory) having tables corresponding to the key major scale and the C key minor scale, and one of these tables is specified by the key data TD. Then, a table is specified by the key data TD, and when the performance starts, based on the specified table, the highest key code signal MKC applied from latch L42 and the data ID applied from latch L41 are set. Correction data FD indicating “0” or “1” is output and added to the data correction circuit 405. In other words, these tables, an example of which is shown in Table 1,
If the note of the key indicated by the addition of MKC and data ID applies to the performance articulation scale indicated by the key data TD, the correction data FD is set to "0", and if the key note does not apply to the performance articulation scale indicated by the key data TD, the correction data FD is set to "0". If it is not present, the correction data FD is set to "1". The data correction circuit 405 is constituted by an adder that adds the data ID added from the latch L41 and the correction data FD.
and FD addition output as interval correction data
It is added to the A input of the selector 43 as ID'.

【table】

[Table] Next, the frequency data generation RM 403 that adds data to the B input of the selector 43 and the frequency specification device 402 related to the frequency data generation RM 403 will be described. The degree designation device 402 may, for example, be a “minor second” ( ^b
2)", "Major 2nd (2)", "Minor 3rd ( ^b 3)"..., "Major 8th
Equipped with 12 power designation switches, each corresponding to the power of "degree (8)", and by turning on any one of the power designation switches, power designation data corresponding to the turned on switch is provided. Output DD. This frequency designation data DD is added to frequency data generation RM403. The frequency data generation RM403 has 24 tables as shown in Table 2 (12 tables corresponding to the major scale of performance keys C to B and 12 tables corresponding to the major scale of performance keys C to B).
Table 2 shows the tables corresponding to the C major scale and the C minor scale.
One of these tables is specified by TD. Then, when a table is designated by the key data TD and a frequency is designated by the frequency designation switch of the frequency designation device 402 and the performance is started, an addition is made from the latch L42 based on the designated table. Highest key code signal MKC
and data corresponding to the frequency designation data DD added from the frequency designation device 402.
SD' is output and this data SD' is sent to the selector 4.
Add to B input of 3. In other words, these tables, an example of which is shown in Table 2, include the highest key code signal.
If the note of the key that is shifted to the treble side by the number of degrees indicated by the frequency specification data DD with respect to the note of the key indicated by MKC corresponds to the performance tuning scale indicated by the key data TD, the data SD' is set to the above frequency specification data to be output. It corresponds to the degree specified by DD, and if it does not correspond to the performance tuning scale indicated by key data TD, data SD' is set as the above degree specification data to be output.
It is designed to correspond to a frequency one higher than the frequency specified by DD. In addition, "Frequency specification data DD" in Table 2
and the numerical value “1” to “12” indicated by “data SD′”
corresponds to the 12 degrees " ^b 2nd degree" to "8th degree".

【table】

[Table] Now, one of the data ID' added to the A input of the selector 43 and the data SD' added to the B input is selected by turning on or off the switch S and added to the adder 44, as described above. Additional sound data (AKC1 to AKC8) is formed, but
In the second processing cycle, delay flip-flop DF42, selector 45, latch L42,
Interval data correction control RM404, data correction circuit 405, selector 43 and adder 4
4 loop or delay flip-flop FD42, selector 45, latch L42,
Each time additional sound data is created, a data correction like the table shown in Table 1 or Table 2 is performed by a loop consisting of the frequency data generation RM 403, selector 43, and adder 44, so that the data is corrected as shown in Table 1 or Table 2. Additional sound data (AKC2~
AKC8) are all data indicating diatonic sounds in the specified key. Below, we will give specific examples of key specification in the key specification device 401 and specific examples of key presses on the accompaniment keyboard 1 (see Figure 1), and additional sound data will be created based on these key specification examples and key press examples. The additional sound data creation operation of the creation circuit 40 will be explained. Now, use the key specifying device 401 to specify the "C key major scale," and use the accompaniment keyboard 1 to select the "C key major scale."
Suppose you press three keys: C ₂ key, E ₂ key, and G ₂ key. As a result, the key data TD indicating "C key major scale" is transferred to the interval data correction control RM.
404 and frequency data generation RM403, interval data correction control R
In the OM 404, the table shown in the first table a is specified, and in the frequency data generation RM 403, the table shown in the second table a is specified. Also,
The key press detection circuit 2 (see FIG. 1) outputs the key time division signal KTDM shown at n in FIGS. 3A and B, and this signal KTDM is applied to the AND circuit A42. In the latch L42, the key code signal KC indicating the _G2 key, that is, "8" is latched as the highest key code signal MKC, and the signal KTDM is further applied to the AND circuit A4.
1, so G ₂ is added to latch L41.
Data indicating the interval between the key and the _E2 key, ie "3", is latched as the data ID. Further, the highest key code signal MKC latched in the latch L42 is sent to the interval data correction control RM404 as a signal addressing the "G" note.
and frequency data generation RM403,
The data ID latched in the latch L41 is sent to the interval data correction control RM404 and the data correction circuit 4 as a signal indicating interval "3".
Added to 05. Therefore, interval data correction control R
In M404, "correction data FD" = "1" due to "highest key code signal MKC" = "G" and "data ID" = "3" in the table shown in Table 1 a.
is read out, and the correction data FD indicating this “1” is added to the data correction circuit 405. As a result, the data correction circuit 405 uses the data indicating the above "3".
The ID and the correction data FD indicating "1" are added to form data indicating "4", and the data indicating "4" is added to the A input of the selector 43 as data ID'. By the way, in order to read the data SD' from the frequency data generator RM403, the key specifying device 4 is
In addition to specifying the key at 01 and pressing keys on the accompaniment keyboard 1, it is necessary to specify the degree using the degree specifying device 402. Therefore, if the frequency of "major 3rd" is specified by the frequency designation device 402, for example, the address for reading out the data SD' (numerical value "4") corresponding to "major 3rd" from the frequency data generation RM 403. The signal is added to the frequency data generation RM403 as frequency designation data DD. As a result, in the frequency data generation RM 403, the "highest key code signal MKC" = "G note" and the "frequency designation data DD" = "3rd" in the table shown in Table 2 a result in "data SD ′” = “4”
is read out, and data SD' indicating this "4" is added to the B input of the selector 43. First, a case will be described in which the switch S is in the on state and the A input of the selector 43 is selected. In this case, the data ID' indicating "4" output from the data correction circuit 405 is
is added to adder 44 via. Therefore, the adder 44 adds the highest key code signal MKC indicating "G ₂ note"("8") added from the latch L42 and the above data ID' indicating "4" to obtain "12", that is, Data indicating "B ₂ notes" is formed and outputted as the first additional tone key code signal AKC1. That is, the additional sound data creation circuit 4 (first
(see figure), the first additional key code signal AKC1 that is formed becomes the "A# ₂ note" which is a non-diatonic note in the "C major scale".
The first additional tone key code signal AKC1 generated by the additional tone data generating circuit 40 shown in FIG. 5 becomes the " _B2 tone" which is a diatonic tone of the "C major scale". Thereafter, in the second processing cycle, a second additional key code signal is generated under the control of timing signals T1 to T7.
Even when the AKC2 to eighth additional key code signals AKC8 are formed, the data ID is corrected as described above by the interval data correction control RM404 and the data correction circuit 405, so all additional sounds are not specified. This is a diatonic sound in a key (in this specified example, "C key major scale"). Furthermore, when "C key minor scale" is specified in the key specifying device 401, the interval data correction control RM404 outputs correction data FD based on the table shown in Table 1 b, and also for C# key to B key. Correction data FD is output based on a table in which the contents of the first tables a and b are shifted corresponding to these C# to B keys. Next, a case will be described in which the switch S is in the off state and the B input of the selector 43 is selected. In this case, the frequency data generation RM403
Data SD' indicating "4" outputted from the selector 43 is applied to the adder 44. Therefore, the adder 44 adds the highest key code signal MKC indicating "G ₂ note"("8") added from the latch L42 and the above data SD' indicating "4" to obtain "12", that is, Form data indicating "B ₂ notes" and send this to the first additional key code signal AKC1.
Output as . This formed first additional key code signal AKC1
The "B ₂ note" indicated by is a diatonic note of the "C major scale" specified here. Hereinafter, in the second processing cycle, when the second additional tone key code signal AKC2 to the eighth additional tone key code signal AKC8 are formed under the control of the timing signals T1 to T7, the same applies to the case where the second additional tone key code signal AKC2 to the eighth additional tone key code signal AKC8 are generated from the frequency data generation RM403. Since the data SD' is generated, all additional tones become diatonic tones in the specified key (in this specified example, "C key major scale"). In addition, when "C key minor scale" is specified in the key specifying device 401, frequency data generation RM40
3 outputs the frequency data SD' based on the table shown in Table 2 b, and also outputs the contents of Table 2 a and b corresponding to C# to B keys. Data based on table in shifted state
Output SD′. Note that as a method of generating data SD' in the additional sound data generation circuit 40, the frequency data generation circuit 42 of the additional sound data generation circuit 4 shown in FIG. is a frequency data correction control R having the same contents and functions as the interval data correction control RM404 of the additional sound data creation circuit 40.
M, and the data correction circuit 405 having the same function as the data correction circuit 405.
By applying the same processing as ID data correction,
It is also possible to obtain data SD′. In this case, as shown in FIG.
An OM4001 and a data correction circuit 4002 are provided between the selector 43 and the adder 44, and the data
It is preferable to configure the ID and data SD to use these in common. In this way, only one data correction control RM, which requires a large capacity, is required, resulting in a large cost advantage. However, the additional sound data creation circuit 400 shown in FIG.
The data correction control RM4001 is basically the interval data correction control RM40.
It may be the same as 4, using the table shown in Table 1, and replacing only the "Data ID" column with "Data ID or Data SD". Further, the data correction circuit 4002 may be exactly the same as the data correction circuit 405 described above. It should be noted that the functions and operations of the additional sound data creation circuit 400 shown in FIG. 6 are already clear from the above description, and will therefore be omitted. Further, the additional sound data creation circuit 4 shown in FIG. 1, the additional sound data creation circuit 40 shown in FIG. 5, or the additional sound data creation circuit 40 shown in FIG.
0, when the A input of the selector 43 is selected, the interval between the two keys corresponding to the highest note and the note immediately below it, among the pressed keys on the accompaniment keyboard 1, is detected, and the interval is The additional notes corresponding to the notes are stacked on the highest note, and two keys corresponding to the lowest note and the note immediately above it, respectively, among the pressed keys,
Or 2 corresponding to the highest and lowest notes, respectively.
It may be configured such that an interval between two keys is detected and an additional note corresponding to this interval is stacked on top of the highest note. Furthermore, although all of the above-mentioned additional sounds have been described as being stacked on the highest note, they may be stacked on the lowest note or intermediate note.
As described above, the number of additional sounds can be arbitrarily set by the number of timing signals (8 signals T1 to T8 in the embodiment). Moreover, although the above-described additional sounds are all stacked on the treble side, it is also possible to change the circuit so that the additional sounds are stacked on the bass side.
That is, in this case, the additional sound data creation circuit 4;
A subtracter may be used instead of the adder 44 of 0 or 400, and if additional tones to be formed are to be stacked with respect to the lowest note, the counter 3 (first
(see figure) is counted backwards from "49" to "1", and the key depression detection circuit 2 (see FIG. 1) scans the accompaniment keyboard 1 from the high-tone side to the low-tone side. Furthermore, instead of the adder 44, a multiplier, a divider, or other arithmetic unit may be used, and in this case, additional tone key information different from that of the above embodiment can be formed. According to the accompaniment sound generation device for an electronic musical instrument according to the present invention, in response to a key press (chord performance) on the accompaniment keyboard,
The number of notes whose degree is determined based on the interval relationship between two predetermined constituent notes of each constituent note of this chord is further stacked, and this is generated as an accompaniment note (chord or automatic arpeggio note). As a result, it is possible to obtain accompaniment sounds that have a richer, richer resonance and are rich in variety. Incidentally, the number of notes that are stacked (additional notes) changes depending on the way the chord is played.For example, even if the same chord is played, the number of notes stacked up (additional notes) changes when played in the basic form of the chord and when played in the inversion form of the chord. It is pronounced as a different additional sound depending on when you play it. Furthermore, if the performance tone is specified in advance and the number of notes of the additional notes is corrected so as not to deviate from the specified performance tone, the accompaniment sound obtained above can be made to have a more natural sound. .

[Brief explanation of drawings]

FIG. 1 is an overall block diagram of an electronic musical instrument equipped with an accompaniment sound generating device according to the present invention, and FIG. 2 is a timing chart showing each timing signal generated from the timing signal generator shown in FIG. 3
FIG. 4 is a timing chart showing the operation of the accompaniment sound generating device according to the present invention; FIG. 4 is a block diagram showing an example of the arpeggio sound search circuit shown in FIG. 1;
5 and 6 are block diagrams showing other embodiments of the additional sound data creation circuit shown in FIG. 1. 1...accompaniment keyboard, 2...key press detection circuit, 3,
41... Counter, 4, 40, 400... Additional sound data creation circuit, 5, 43, 45... Selector,
6...Decoder, 7...Key information temporary memory, 8...
...Accompaniment pattern generator, 9...U/D counter, 10...Arpeggio sound search circuit, 11...
...Chord tone forming circuit, 12...Arpeggio sound forming circuit, 13...Mixing circuit, 14...Sound system, 15, 16...Differentiator, 20...Timing signal generator, 42...Frequency data generation circuit, 44... Adder, 401... Key specifying device, 4
03...Frequency data generation ROM, 404...Interval data correction control ROM, 405,400
2...Data correction circuit, 4001...Data correction control ROM, S...Switch.

Claims (1)

[Scope of Claims] 1. Key information generation means for outputting chord constituent note key information consisting of a plurality of key information corresponding to each constituent note of a chord in response to a key pressed on a keyboard; and a chord structure to be outputted. an interval relationship calculating means for calculating an interval relationship between two predetermined constituent tones of the chord key information; additional tone key information forming means for forming and outputting additional tone key information indicating an additional tone having the determined pitch relationship with respect to the corresponding specific constituent tone based on the key information; 1. An accompaniment sound generation device for an electronic musical instrument, comprising musical tone generation means for generating accompaniment musical tones corresponding to each constituent tone of a chord and each additional tone based on additional tone key information. 2. The accompaniment sound generation device for an electronic musical instrument according to claim 1, wherein the two predetermined constituent tones are the two highest tones of the constituent tones of the chord. 3. key information generating means for outputting chord constituent note key information consisting of a plurality of key information corresponding to each constituent note of a chord in response to a key pressed on a keyboard; key specifying means for specifying a performance key; An additional note key that selects key information corresponding to a specific constituent note from the chord constituent note key information, and indicates an additional note having a predetermined pitch relationship with respect to the specific constituent note based on the selected key information. In forming the information, the predetermined interval relationship is corrected based on the specified performance key so that this additional note does not deviate from the scale of the specified performance tone, and the additional note is corrected based on the corrected interval relationship. additional tone key information forming means for forming and outputting additional tone key information indicating a tone; and a musical tone generating accompaniment musical tones corresponding to each of the constituent tones of a chord and each additional tone based on the chord constituent tone key information and the additional tone key information. An accompaniment sound generation device for an electronic musical instrument, comprising a generation means. 4. Key information generating means for outputting chord constituent note key information consisting of a plurality of key information corresponding to each constituent note of a chord in response to a key pressed on a keyboard; and key specifying means for specifying a performance key; Selecting key information corresponding to a specific constituent note from the chord constituent note key information, and indicating a first additional note having a predetermined pitch relationship with respect to the specific constituent note based on the selected key information. In forming the first additional note information, the predetermined interval relationship is corrected based on the specified performance key so that the additional note does not deviate from the scale of the specified performance key, and the corrected pitch is forming first additional note key information indicating the first additional note based on the relationship; and further determining a predetermined pitch relationship for the first additional note based on the formed first additional note key information; In forming the second additional sound key information indicating the second additional sound located in
In order to ensure that this additional note also does not deviate from the scale of the specified performance tone, a predetermined interval relationship with the first additional note is corrected based on the specified performance tone, and based on this corrected interval relationship, additional tone key information forming means for forming and outputting a plurality of additional tone key information by forming second additional tone key information indicating a second additional tone and repeating this a plurality of times; An accompaniment sound generation device for an electronic musical instrument, comprising a musical tone generating means for generating accompaniment musical tones corresponding to each constituent tone of a chord and each additional tone based on the plurality of additional tone information.