JPS631595B2 - - Google Patents

Description

[Detailed description of the invention]

This invention divides the keyboard into key ranges and allows different performance modes for each key range (for example, melody performance and accompaniment performance).
An electronic musical instrument comprising a first mode in which the keyboard is played in a different manner, and a second mode in which the entire keyboard range is played in different performance modes without dividing the keyboard, and each of these modes can be switched and selected at will. Especially the second one above.
This invention relates to enabling performance tones corresponding to each performance mode in the above mode to be produced in different musical tone modes. Generally, in an electronic musical instrument equipped with multiple keyboards such as an upper keyboard and a lower keyboard, melody performances are performed on the upper keyboard, and accompaniment performances are performed on the lower keyboard. Then, melody performance sounds and accompaniment performance sounds are produced in the musical tone mode (typically timbre, but also includes pitch, volume, envelope shape, etc.) set for each keyboard. On the other hand, even in electronic instruments that have only one keyboard due to cost or transportability when used for stage performance, "key range division" allows each key range to correspond to a different musical sound mode, allowing the treble side keys to be The melody is played in the lower key range, the accompaniment is played in the lower key range, and the melody and accompaniment sounds are produced in different tones. In addition,
The expression "different musical tones" means that one or more of various elements such as timbre, pitch, volume, envelope shape, etc. are different. However, in such single-keyboard electronic musical instruments, the total number of keys on the keyboard is usually small (for reasons such as cost and transportability), so the range of each key range when dividing the keyboard range is limited. This creates the inconvenience of being restricted and not being able to play freely. Therefore, in consideration of the above points, we created a mode (hereinafter referred to as normal mode) in which the relationship between the key range and musical tone mode is not fixed, but all key ranges are made to correspond to the same tone mode, and restrictions on dividing the key range are removed. ), and a mode in which the above-mentioned key ranges are divided to correspond to different musical tones (hereinafter referred to as "split mode").
An electronic musical instrument has also been proposed which is equipped with the following modes and can arbitrarily switch between these modes. Such electronic musical instruments have the excellent advantage that by selecting each of the above modes as appropriate, one keyboard can be used effectively and playability can be improved. When performing a performance and an accompaniment performance, the melody performance sound and the accompaniment performance sound are produced in the same musical tone form (timbre), and there is a problem that, for example, it is not possible to make the melody performance sound and the accompaniment performance sound different in tone. arise. Note that in the split mode, the musical tone mode (timbre) can be set for each key range, so it is very easy to make the timbre of the melody performance sound different from the timbre of the accompaniment performance sound. The present invention has been made in view of the above-mentioned points, and provides an electronic musical instrument in which the above-mentioned normal mode and split mode can be switched and selected, in which the melody performance sound and the accompaniment performance sound in the normal mode are produced in different musical tones. The purpose is to make it possible. To achieve this purpose, in the present invention, when the normal mode is selected, the highest note among the pressed keys in the entire keyboard range is detected,
The musical tone corresponding to the detected highest note key is generated as a melody performance sound from the melody musical tone generation system, but in this case, if the detected highest note key does not satisfy a predetermined condition, the musical tone corresponding to the detected highest note key is The corresponding musical tone, that is, the melody performance tone, is prohibited from being produced. In general, melody performances are performed at a higher pitch than accompaniment performances, and in most cases, melody performances are single-note performances. Therefore, the highest note among the pressed keys in the entire key range can be considered to correspond to a melody performance, and the melody performance sound can be extracted by detecting this highest note. By the way, the above-mentioned highest note detection does not cause any problems while the keys are being pressed for the melody performance, but if the key presses for the melody performance are interrupted even for a moment, the highest note detection will not be performed. The highest note is detected as the highest note, and as a result, a musically undesirable situation occurs in which the highest note among the accompaniment performance sounds is sounded as a melody performance sound. Therefore, in this invention, "predetermined conditions" are set for the pronunciation of the melody performance sound corresponding to the highest note.
is attached. In the present invention, the "predetermined condition" is to generate a melody performance sound only when the highest note corresponds to a newly pressed key.
By setting these conditions, the melody musical sound generation system will only generate sound when the highest note is newly pressed (in other words, when a new key press operation for melody performance is performed). It is. Therefore, even if the key press operations for the melody performance are interrupted while the key press operations for the accompaniment performance are being performed, the highest note among the accompaniment performance sounds will not be sounded as the melody performance sound. This is because the highest note in the accompaniment performance is a key that has already been pressed, not a newly pressed key. If a key press operation is performed again for melody performance in this state, this pressed key will be detected as the highest note among all the pressed keys including accompaniment performance, and since it is a newly pressed key, the pressed key will be A melody performance sound is produced in response to. Another example of the "predetermined condition" is to "produce a melody performance sound only when the newly detected highest note is not further away from the previously detected highest note by more than a predetermined pitch". be. In general, it is thought that the melodic pitch of a melody performance does not shift extremely to the lower pitch side, so if the new highest note is more than a predetermined pitch lower than the previous highest note, the melody performance will be pushed. It can be determined that the key operations were temporarily interrupted and the key operations became only for accompaniment performance. In this way, it is automatically determined that the key press operation is only for accompaniment performance, and the highest note of the accompaniment performance sounds is prohibited from being produced as a melody performance sound from the melody musical sound generation system. On the other hand, in split mode, as mentioned above, the melody performance key range and the accompaniment performance key range are differentiated, so the musical sound of the pressed key on the high side (key range) of the melody performance key range can be directly used as the melody performance sound. Bye. In the embodiment of the present invention, the melody performance is usually a single-note performance, and in consideration of costs and the like, the musical tone generation system for the melody has a single-note configuration. For this reason, even in the "split mode", the highest note among the pressed keys for melody performance is detected and this highest note is generated as the melody performance sound from the melody musical sound generation system.
For the above-mentioned "highest note detection/melody performance sound generation" in this split mode, "predetermined conditions" are not set like in normal mode, but simply the highest pressed key in the melody performance key range. It is sufficient to detect the sound and generate it as a melody performance sound from a melody musical sound generation system. By the way, according to the present invention, even in the normal mode, it is possible to generate the melody performance sound and the accompaniment performance sound in different tones. Although this is fully satisfactory for normal performance, it is not satisfactory for any performance. For example, if you repeatedly press only keys for accompaniment performance without performing key presses for melody performance, the above-mentioned "predetermined condition" is met and the highest note of the accompaniment performance sound is generated by the melody musical sound generation system. It may also be pronounced. Therefore, when performing such a special performance, the split mode may be selected. In this way, the combination of normal mode and split mode further improves playability. Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings. First Embodiment FIG. 1 is a block diagram showing the overall configuration of a first embodiment of an electronic musical instrument according to the present invention. First, the general configuration of this electronic musical instrument will be explained. This electronic musical instrument has a keyboard section 1 with a single-level keyboard configuration in which keys corresponding to C ₂ to C ₆ are arranged in a row.
and set the performance mode to “split mode” or “
It has a mode selection switch _S1 for selecting and setting "Normal mode".When the mode selection switch _S1 is set to "Split" side, the mode selection signal NS
becomes "O", and this electronic musical instrument operates in "split mode". In the "split mode", the keyboard section 1 has a treble side keyboard area 1a (key range from F# ₃ to _C6 in this example) and a bass side keyboard area 1b (key from _C2 to _F3 in this example). It is divided into two key ranges). Furthermore, when the mode selection switch _S1 is set to the "normal" side, the mode selection signal NS becomes "1" and the electronic musical instrument operates in the "normal mode". The keyboard section 1 is provided with key switches (not shown) corresponding to the number of keys, and each key switch is configured to be turned on and off in conjunction with the key press operation of the corresponding key. ing. In addition,
In the following explanation, each key switch output in the treble side key area 1a will be referred to as a key-on signal UKON, and each key switch output in the bass side key area 1b will be referred to as a key-on signal LKON. The key-on signals UKON and LKON are "1" while the key is pressed, and become "0" when the key is released. 2 inputs each key-on signal UKON of the treble side keyboard region 1a of the keyboard section 1, so that only the key-on signal (UKON) corresponding to the highest note among the key-on signals UKON set to "1" is passed through as is. This is the highest tone priority circuit configured, and this priority circuit 2
is constituted by, for example, a known parallel priority logic circuit. 3 is based on each key-on signal UKON of the treble side keyboard area 1a and each key-on signal LKON of the bass side keyboard area 1b output from the keyboard section 1,
Detects whether the highest note among the keys pressed simultaneously in all the key ranges 1a and 1b of the keyboard section 1 is a newly pressed key or not, and if it is a newly pressed key. This new key highest note detection circuit is configured to output a melody key-on signal (KON*) of "1" in response to the highest note. Both 5 and 6 are selectors configured to selectively pass the signals supplied to the two input terminal groups A and B, and these selectors 5 and 6 are configured to selectively pass the signals supplied to the two input terminal groups A and B. ,
It is configured to output the signals supplied to the A input terminal group in the case of "split mode", and the signals supplied to the B input terminal group in the case of "1", that is, "normal mode". has been done. Reference numeral 7 denotes a melody tone forming circuit (single tone configuration in this embodiment) that forms a musical tone signal of a melody performance tone, and the tone of the musical tone signal formed in the forming circuit 7 can be set arbitrarily by operating a tone setting device 8. Can be set to a melody tone. Reference numeral 9 denotes an accompaniment tone forming circuit (multitone configuration) that forms a musical tone signal of an accompaniment performance tone, and the tone of the musical tone signal formed in this forming circuit 9 can be changed to any accompaniment tone by operating the tone setting device 10. Configurable. Next, details of this electronic musical instrument will be explained along with its operation. As mentioned above, this electronic musical instrument operates in either the "split mode" or the "normal mode", so each mode will be explained separately. (A) Split mode To select the "split mode", set the mode selection switch _S1 to the "split" side and set the mode selection signal NS to "0". When the mode selection signal NS is “0”,
The selectors 5 and 6 select and output the signals input to the A input terminal group as described above. The output of the highest tone priority circuit 2 is input to the A input terminal group of the selector 5. As mentioned above, the highest note priority circuit 2 selects and outputs only the key-on signal (UKON) of the key corresponding to the highest note among the pressed keys in the treble side key region 1a, and therefore, the melody tone is formed. The circuit 7 is supplied with each key-on signal UKON through the selector 5, in which only the one corresponding to the highest tone is "1" and all the others are "0". Therefore, the melody sound forming circuit 7 outputs a musical tone signal corresponding to the highest note of the pressed keys for playing the melody in the treble side key region 1a as a melody tone, and supplies it to the sound system 11 to play the melody. Pronounced as a performance sound. On the other hand, the keyboard section 1 is connected to the A input terminal group of the selector 6.
Each key-on signal in the bass side key region 1b of
LKON is input, and the accompaniment tone forming circuit 9 receives a key-on signal via the selector 6.
LKON is supplied. Therefore, the accompaniment tone forming circuit 9 outputs a musical tone signal corresponding to each pressed key for accompaniment performance in the bass side key region 1b as an accompaniment tone, and is supplied to the sound system 11 to be emitted as an accompaniment performance tone. Therefore, in this split mode, if you play a melody with your right hand using the treble keyboard area 1a and perform an accompaniment performance using the bass keyboard area 1b with your left hand, the sound system 11 will output the melody performance sound. The melody tone set by the tone setting device 8 is used to produce the melody, and the accompaniment performance tones are produced by the accompaniment tone set by the tone setting device 10. (B) Normal mode To select the "normal mode", set the mode selection switch _S1 to the "normal" side and set the mode selection signal NS to "1". In the following explanation, it is assumed that the normal melody effect switch _S2 is turned off. When the mode selection signal NS is “1”,
The selectors 5 and 6 select and output the signals input to the B input terminal group as described above. A melody key-on signal KON output from the New Key highest note detection circuit 3 is applied to the B input terminal group of the selector 5. As mentioned above, the detection circuit 3 outputs "1" corresponding to the highest note of keys pressed at the same time on the keyboard section 1 only when the highest note is the newly pressed key. It outputs a melody key-on signal KON*, and is composed of a circuit as shown in FIG. 2, for example. In Fig. 2, each key-on signal UKON, LKON output from the keyboard section 1 is connected to the highest tone priority circuit 2.
0 and a differentiating circuit 21 provided corresponding to each key.
-1, 21-2, . . . are respectively input. The highest tone priority circuit 20 receives each key-on signal UKON,
Among the LKONs whose state is "1", only the key-on signal corresponding to the highest tone is output as is, and all other key-on signals are output with "0". On the other hand, each differentiating circuit 21-1, 21-2,
... is the key-on signal input to each
Rising of UKON or LKON (from “0” to “1”)
A pulse signal (“1”) with a minute pulse width is output in synchronization with the change in Each of these differentiating circuits 21-1,
The outputs of 21-2, . . . are respectively added to AND gates 22-1, 22-2, .
Each key-on signal output from the highest tone priority circuit 20 is applied to the other inputs of each AND gate 22-1, 22-2, . . . . Therefore, among the key-on signals output from the highest tone priority circuit 20, the key-on signal that is "1" (corresponding to the highest tone among the pressed keys) is input.
Only the AND gate (any one of 22-1, 22-2, . . . ) becomes operational and allows the output of the corresponding differential circuit (21-1, 21-2, . . . ) to pass through. As a result, only when the key corresponding to the highest note of each pressed key on the keyboard section 1 is a newly pressed key, the AND gate (22-1, 22-2,...
) outputs a pulse signal of “1”. In this way, the AND gate (22-1, 22-2,
The “1” pulse signal output from ) is an OR
The signal is supplied to the strobe terminal S of the latch circuit 24 via the gate 23. The latch circuit 24 has a bit corresponding to each key, and output signals of AND gates 22-1, 22-2, . . . are applied to its input side, and a pulse of "1" is applied to its strobe terminal S. When the signal is supplied, the AND gate 22-1,
22-2, . . . output signals are latched. Therefore, in the latch circuit 24, "1" is stored only in the bit corresponding to the highest note newly pressed key.
Each bit output of the latch circuit 24 is connected to the AND gate 2.
5-1, 25-2, . . . respectively, and enable the AND gate corresponding to the highest newly pressed key. Each AND gate 25-1, 25-2,...
Since the key-on signal UKON or LKON is added to the other inputs of ..., only the key-on signal corresponding to the highest newly pressed key is applicable.
It passes through the AND gates (25-1, 25-2, . . . ) and is output as the melody key-on signal KON*. In this way, the new key highest note detection circuit 3
The melody key-on signal KON* output from the melody key-on signal KON* is supplied to the melody sound forming circuit 7 via the selector 5. Therefore, the melody tone forming circuit 7 outputs a musical tone signal corresponding to the highest newly pressed key in a melody tone, and supplies it to the sound system 11, where it is produced as a melody performance tone. As mentioned above, the highest newly pressed key is the highest note among the simultaneously pressed keys of keyboard section 1 and is the newly pressed key, so this highest newly pressed key corresponds to the pressed key for melody performance. do. Therefore, every time a key press operation for playing a melody is performed from the melody sound forming circuit 7 on the keyboard section 1 (this key press operation may be in the key area 1a or 1b), A musical tone signal corresponding to the key will be output. Note that when the key is released, the new key highest note detection circuit 3
Since the melody key-on signal KON* is no longer output (KON*="0"), the melody tone forming circuit 7 does not output a musical tone signal. In this case, when there are no more keys pressed for the melody performance, the highest note of the pressed key on the keyboard section 1 becomes the pressed key for the accompaniment performance, but the pressed key for the accompaniment performance has already been pressed. Since this is not a newly pressed key, a melody key-on signal is generated in response to the pressed key.
KON* does not occur. Therefore, the musical sound signal of the melody performance sound is not outputted from the melody sound forming circuit 7 in response to the pressed key of the accompaniment performance. On the other hand, the output of the AND gate group 14 is input to the B input terminal group of the selector 6. The AND gate group 14 has the same number of keys as the keys provided corresponding to each key.
Consisting of an AND gate, each bit of the output signal of the inversion circuit 13 is applied to one input of each AND gate, and each key-on signal UKON or LKON output from the keyboard section 1 is applied to the other input. ing. When normal melody effect switch _S2 is off, gate circuit 12 is on, and selector 5
The output signal (having the same number of bits as the number of keys, each bit corresponding to each key) is supplied to the inverting circuit 13 via the gate circuit 12. The inverting circuit 13 inverts each bit of the input signal and outputs it, so in this "normal mode" its output signal is the melody key-on signal KON*.
Only the bit where the error occurs becomes "0", and the other bits become "1". In response to this, AND gate group 1
In step 4, only the AND gate corresponding to the melody key-on signal KON*, that is, the key pressed for the melody performance (the highest note newly pressed key) becomes inoperable, and all the other AND gates become operable. As a result, each key-on signal UKON,
Only the key-on signal corresponding to the highest newly pressed key in LKON is blocked by the AND gate,
Other key-on signals pass through the AND gate group 14 and are supplied to the accompaniment tone forming circuit 9 via the selector 6. Therefore, the accompaniment tone forming circuit 9 outputs musical tone signals in accompaniment tones corresponding to the pressed keys of the keyboard section 1 other than the pressed keys for melody performance, that is, the pressed keys for accompaniment performance. That will happen. That is, the circuit 9 outputs a musical tone signal corresponding to the pressed key for accompaniment performance, and this musical tone signal is supplied to the sound system 11 to be produced as an accompaniment performance sound. Therefore, in this "normal mode", if you press a key for melody performance or accompaniment performance in any key range of keyboard section 1, the key range to which each pressed key belongs will be changed to the key range. 1a or 1b
In either case, the pressed key for melody performance and the pressed key for accompaniment performance are automatically distinguished, and the musical tone corresponding to the pressed key for melody performance is the melody tone of the melody tone set by the tone setting device 8. The musical tone corresponding to the pressed key of the accompaniment performance is emitted as an accompaniment performance sound of the accompaniment tone set by the tone color setting device 10. In this "normal mode", when the normal melody effect switch _S2 is turned on, the gate circuit 12 is always turned off, and as a result, all bits of the output signal of the inverting circuit 14 become "1". As a result, each key-on signal is output from the AND gate group 14.
UKON and LKON are all output and supplied to the accompaniment tone forming circuit 9. Therefore, when the switch _S2 is turned on, the accompaniment tone forming circuit outputs musical tone signals corresponding to all the pressed keys including the pressed keys for melody performance. In this way, when the switch _S2 is turned on, musical tones are produced with melody tones and accompaniment tones for the pressed keys for melody performance, providing a new performance effect. As is clear from the above explanation, in the electronic musical instrument shown in the first embodiment, the keyboard section 1 can be set to either the "split mode" or the "normal mode" simply by switching the mode selection switch _S1 . Even if it is set to "Normal mode", as long as the normal melody and accompaniment are being played,
The melody performance sound and the accompaniment performance sound can be generated in different musical tone modes (timbres). In addition, in this example, "split mode"
In the case of , the highest note of the pressed key in the treble side keyboard area 1a is detected and only the highest note is generated as a melody performance sound, but the melody performance sound is generated for all the pressed keys in the keyboard area 1a. You can do it like this. To this end, the highest note priority circuit 2 in FIG. It may be a double-tone structure. Further, in this embodiment, the keyboard section 1 is configured with a single-level keyboard, but the present invention is not limited to this, and the keyboard section 1 can be configured with a two-level keyboard (an upper keyboard and a lower keyboard). It's okay. In this case, the upper keyboard corresponds to the treble side keyboard area 1a, and the lower keyboard corresponds to the bass side keyboard area 1b. Second Embodiment FIG. 3 is a block diagram showing the overall configuration of a second embodiment of the electronic musical instrument according to the present invention. The basic operation of the electronic musical instrument shown in the second embodiment is exactly the same as that of the electronic musical instrument in the first embodiment (FIG. 1), and the only difference is the specific circuit configuration. In this second embodiment, a time division processing method is adopted as a specific circuit configuration. Next, the configuration and operation of the electronic musical instrument of the second embodiment will be explained. In this embodiment, the same parts as in the first embodiment (FIG. 1) are denoted by the same reference numerals, and the explanation thereof will be omitted. Reference numeral 30 indicates the on/off state of each key switch of the keyboard section 1 in synchronization with the clock φ shown in _FIG.
This multiplexer is configured to scan one note at a time from the high note side to the low note side from _C2 note to note one by one, and output the scanning result as a time-sharing key data signal KTDM. This multiplexer 30, as shown in FIG.
Timing signal YH indicating the period during which is being scanned
(hereinafter referred to as the high key range timing signal), a timing signal YL indicating the period during which the bass side key range 1b is scanned (hereinafter referred to as the low key range timing signal), and the start point of the scanning cycle (in this example, (1 clock φ before the start point)
It is configured to output a synchronization signal SY (hereinafter referred to as a scan start synchronization signal) indicating the scan start synchronization signal. 3
1 inputs the key data signal KTDM indicating the on/off state of each key switch outputted from the multiplexer 30 in a time-division manner and sequentially shifts it in synchronization with the clock φ.
This is a 50-stage, 1-bit shift register configured to delay KTDM by one scanning cycle (50 clocks φ) and output it. Therefore,
The contents of the delayed key data signal KTDM sequentially output from the shift register 31 are determined by the on state of the key switch being scanned by the multiplexer 30 at that point in time during the previous scan.
This corresponds to the off state. 32 is a melody sound forming circuit (single note configuration) that forms a musical sound signal of the melody performance sound, and based on the melody key code KC* output from the latch circuit 43, which will be described later, the musical sound signal of the melody performance sound is sent to the tone setting device 8. It is formed and output using the melody tone set by . 33 is an accompaniment sound forming circuit that forms a musical tone signal of an accompaniment performance sound, and is an OR which will be described later.
Accompaniment tone key data signal output from gate 47
Based on KTDM**, a musical tone signal of each accompaniment performance tone is formed with an accompaniment tone set by the tone setting device 10 and output. In this formation circuit 33, the input accompaniment tone key data signal KTDM
** is time-division multiplexed, so the signal
Demultiplexing means is provided for demodulating KTDM** into static key press signals, and musical tone signals for each accompaniment performance tone are formed based on the demodulated key press signals. A clock φ and a scan start synchronization signal SY are input to this circuit 22 for the above-mentioned demultiplexing. Next, details of this electronic musical instrument will be explained along with its operation. Like the electronic musical instrument of the first embodiment described above, this electronic musical instrument also operates in a "split mode" or a "normal mode", so each mode will be explained separately. Note that the functions, effects, etc. of each mode of this second embodiment are exactly the same as those of the first embodiment described above, so their explanation will be omitted below, and the circuit operation for realizing each mode will be mainly described. explain. (A) Split mode To select the "split mode", set the mode selection switch _S1 to the "split" side and set the mode selection signal NS to "0". When the mode selection signal NS is in the “0” state, the AND gate 35 to which this signal NS (“0”) is input becomes inoperable, and the AND gate 35 to which the signal NS (“0”) is inverted by the inverter 36 and input Gate 34 becomes operational. The output of AND gate 37 is applied to AND gate 34 . AND gate 3
7 has a high key range timing signal YH (Figure 4) and a delay flip-flop (hereinafter referred to as DFF).
The Q output of an RS flip-flop (hereinafter referred to as RSFF) 39 delayed by one period of the clock φ and the key data signal KTDM output from the multiplexer 30 are inputted via the input signal 38. The RSFF 39 is set by the scan start synchronization signal SY at a timing one cycle of the clock φ before the scan start point, and the multiplexer 30
It is reset at the first rising timing of the key data signal KTDM output from ``0'' to ``1'' (that is, at the beginning of the time slot in which the highest pressed key is scanned). For this reason, DFF38
The Q output is calculated from the scanning start point (i.e., the point in time when the _C6 note key is scanned) to the end point of the scanning period for the highest key of the pressed keys in key ranges 1a to 1b. It will be “1” only during the period. Therefore, the AND gate 37 starts scanning the treble side key area 1a from the time when scanning for the treble side key area 1a starts.
Operation is possible only until the end of scanning for the highest key pressed in step a, and by passing the key data signal KTDM output from the multiplexer 30 during that time, the AND gate 37 is activated. On the output side, a "1" pulse is obtained only in synchronization with the scan timing for the highest pressed key in the treble side key region 1a. This "1" pulse is then passed through the AND gate 34 and the OR gate 40 to the latch circuit 41.
is supplied to the strobe terminal S of the latch circuit 41.
The count value of the counter 42 at that point in time is latched. Here, the counter 42 counts the clock φ and is reset every time the scan start synchronization signal SY arrives.
The count value at any point in time corresponds one-to-one to the key being scanned at that point in time. Note that since the sequentially changing count value of the counter 42 corresponds one-to-one to each key, the count value will be referred to as a key code KC in the following explanation. Therefore, the key code KC latched by the latch circuit 41 corresponds to the key corresponding to the highest note among the keys pressed in the treble side key region 1a. The key code KC latched in the latch circuit 41 is transferred to the latch circuit 43 upon generation of the next scan start synchronization signal SY, and the contents of the latch circuit 41 are reset immediately after this transfer. Then, the above processing operation is repeated again, and the latch circuit 41
Then, the key code KC corresponding to the highest key of the pressed keys in the treble side key region 1a is latched again. Therefore, from the latch circuit 43, the treble side key range 1
The key code KC corresponding to the highest note among the pressed keys at a is continuously output.
The melody key code KC* output from the latch circuit 41 is supplied to the melody sound forming circuit 32. The melody sound forming circuit 32 forms a musical sound signal having a pitch corresponding to the input melody key code KC* and a melody tone set by the tone setting device 8, and outputs it to the sound system 11.
Therefore, from the sound system 11, a musical tone corresponding to the highest note of the pressed keys for melody performance in the treble side key region 1a is produced as a melody performance sound. On the other hand, when the mode selection signal NS is “0”,
The AND gate 44 to which this signal NS (“0”) is directly input becomes inoperable, and the AND gate 4 to which this signal NS (“0”) is input via the inverter 46 becomes inoperable.
5 becomes operational. The low key range timing signal YL (FIG. 4) is applied to the other input of the AND gate 45, and the key data signal KTDM output from the multiplexer 30 is sent to the shift register 31.
It has been added via. Therefore, the AND gate 45 allows the key data signal KTDM to pass only during the scanning period of the bass side key region 1b. As a result, the AND gate 45 outputs the key data signal KTDM indicating the key depression state of the bass side key region 1b, and the OR gate 47
is supplied to the accompaniment tone forming circuit 33 as an accompaniment tone key data signal KTDM**. The accompaniment tone forming circuit 33 generates an accompaniment tone key data signal.
Based on KTDM**, a musical tone signal corresponding to each pressed key in the bass key region 1b is formed with the accompaniment tone set by the tone setting device 10 and output to the sound system 11. Therefore, from the sound system 11, musical tones corresponding to the pressed keys for accompaniment performance in the bass side key region 1b are produced as accompaniment performance sounds. In this way, even in the "split mode" of the second embodiment, it is possible to obtain exactly the same performance effect as in the "split mode" of the first embodiment (FIG. 1) described above. (B) Normal mode To select "Normal mode", set the mode selection switch S ₁ to the "Normal" side and set the mode selection signal MS to "1". Note that in the following explanation, the normal melody effect It is assumed that switch _S2 is turned off.When mode selection signal NS is “1”,
The AND gate 35 to which the signal NS (“1”) is input becomes operational, while the AND gate 34 to which the signal NS (“1”) is input via the inverter 36 becomes inoperable. The outputs of AND gates 49 and 50 are applied to other inputs of AND gate 35 via OR gate 48. The AND gate 49 is supplied with the Q output of the RSFF 39 delayed by one period of the clock φ via the DFF 38, the key data signal KTDM output from the multiplexer 30, and the output of the shift register 31 inverted by the inverter 51. has been done. As mentioned above, the Q output of the DFF 38 is "1" only during the period from the start of scanning (that is, the time when the C ₆ note key starts being scanned) to the end of the scanning period for the highest key pressed, and The output of the inverter 51, which is the inverted output of the register 31, becomes "1" only during the scanning period corresponding to the key that was not pressed in the previous scanning cycle. Therefore,
The AND gate 49 was not pressed in the previous scan cycle, but was pressed in the current scan cycle, and corresponds to the highest note among all the keys pressed in the current scan cycle. A "1" pulse is generated only during the scanning period of the key. That is, the AND gate 49 detects in each scanning cycle whether or not the highest note among the keys being pressed at the same time is the newly pressed key, and the highest note is the newly pressed key. Only in this case, a "1" pulse is output once in synchronization with the scanning timing of the highest pitch newly pressed key. This “1” pulse is OR gate 48, AND gate 35
and is supplied to the strobe terminal S of the latch circuit 41 via the OR gate 40. Therefore, the key code KC corresponding to the highest note newly pressed key output from the counter 2 at that time is latched in the latch circuit 41. Key code KC latched in latch circuit 41
is inputted to the melody sound forming circuit 32 as the melody key code KC* in the same manner as in the above-mentioned "split mode". Therefore, the melody key code KC is output from the melody sound forming circuit 32.
A musical tone signal corresponding to the key specified by (highest newly pressed key) is formed with a melody tone and is output to the sound system 11. It should be noted that, as described in the first embodiment, the above-mentioned highest note newly pressed key corresponds to the pressed key for melody performance. By the way, when the key corresponding to the highest note among the pressed keys is a newly pressed key, a "1" pulse is output from the AND gate 49 in the scanning cycle immediately after the key is pressed. Thereafter, as long as this key press state continues, no "1" pulse will be output. Therefore, the latch circuit 41 stores the key code only in the scan cycle immediately after the highest pitch newly pressed key is pressed.
KC is latched, and the key code KC is no longer latched in subsequent scan cycles. As a result, the melody sound forming circuit 32 receives the key code.
A problem arises in that KC is no longer input as the melody key code KC*, and a musical tone signal is no longer formed. Therefore, in this embodiment, an AND gate 50 is provided in parallel with the AND gate 49, and this AND gate 50 is provided in parallel with the AND gate 49.
The above problem is solved by controlling the gate 50 by the output of the match determining circuit 52. That is, as described above, when a new key is pressed in response to a melody performance on the keyboard section 1, the "1" pulse output from the AND gate 49 is generated for the first scanning cycle in which this is detected. As a result, the key code KC corresponding to the pressed key is latched in the latch circuit 41, and this key code KC is transferred to the latch circuit 43 immediately before the start of the second scanning cycle. The key code KC transferred to the latch circuit 43 is supplied as a melody key code KC* to the melody sound forming circuit 32 and also to the input terminal B of the coincidence determination circuit 52. A key code KC representing a scanning key outputted from the counter 42 is supplied to an input terminal A of the coincidence determination circuit 52. Therefore, when the pressed key is scanned in the second scanning cycle, the key codes KC and KC* match at that scanning timing, and a match output "1" is sent from the output terminal EQ of the match determination circuit 52. is applied to the AND gate 50, enabling the AND gate 50. On the other hand, at this scanning timing, the key data signal KTDM ("1") related to the pressed key is output from the shift register 31, so the signal KTDM ("1") is
Output from AND gate 50, OR gate 48,
After passing through an AND gate 35 and an OR gate 40 in this order, the signal is supplied to a strobe terminal S of a latch circuit 41. Therefore, the key code at that time, that is, the key code KC corresponding to the pressed key, is latched again in the latch circuit 41. In this way, when a new key for playing a melody is pressed, in the first scan cycle in which this is detected, the output of the AND gate 49 causes the latch circuit 41 to select the key corresponding to the pressed key. The code KC is latched, and for subsequent scanning cycles, the key code KC corresponding to the pressed key is latched in the latch circuit 41 by the output of the AND gate 50. Therefore, when a key for playing a melody is pressed, the key code KC corresponding to that key is repeatedly latched in the latch circuit 41 as long as the key continues to be pressed.
and is supplied to the melody sound forming circuit 32 as a melody key code KC*. On the other hand, when the mode selection signal NS is “1”,
AND gate 44 that inputs this signal NS (“1”)
becomes operable, and the AND gate 45 to which the signal NS (“1”) is input via the inverter 46 becomes inoperable. The output signal of the OR gate 53 and the key data signal KTDM output from the multiplexer 30 are applied to the other input of the AND gate 44 via the shift register 31. The output signal of the normal melody effect switch _S2 and the output signal of the inverter 54 are input to the OR gate 53, but in this case, since the switch _S2 is off, its output signal is "0", so
The output signal of the OR gate 53 is only the output signal of the inverter 54. As described above, the coincidence determination circuit 52 sends out a coincidence output "1" from its output terminal EQ only at the scanning timing of the key corresponding to the melody key code KC* output from the latch circuit 43. This coincidence output "1" is inverted by an inverter 54 and then applied to an AND gate 44 via an OR gate 53. Therefore, AND
The gate 44 becomes inoperable and blocks the key data signal KTDM only at the scanning timing of the key corresponding to the melody key code KC* (i.e., the pressed key for melody performance), and becomes operable at other timings and blocks the key data signal. Pass the signal KTDM. As a result, the AND gate 44 outputs the key data signal KTDM indicating the pressed state of the keys for the accompaniment performance, excluding the pressed keys for the melody performance, and the accompaniment sound key data signal KTDM** is outputted via the OR gate 47. The signal is supplied to the sound forming circuit 33. Therefore, from the accompaniment tone forming circuit 33, the keyboard section 1
Among the pressed keys in , the musical tone signals corresponding to the pressed keys other than the pressed keys for melody performance, that is, the pressed keys for accompaniment performance, are output as accompaniment tones and supplied to the sound system 11, and are produced as accompaniment performance sounds. In addition, in this “normal mode”, if the normal melody effect switch S ₂ is turned on,
The output signal of the OR gate 53 is always "1".
As a result, the AND gate 44 becomes operable at all times and outputs the key data signal KTDM as it is.
Therefore, the accompaniment tone forming circuit 33 outputs musical tone signals corresponding to all the pressed keys on the keyboard section 1. Thus, even in the "normal mode" of this second embodiment, the above-mentioned first embodiment (first
It is possible to obtain exactly the same performance effect as in the "normal mode" shown in Fig.). It goes without saying that in this second embodiment as well, the keyboard section 1 may be configured with a two-stage keyboard. Third Embodiment FIG. 5 is a block diagram showing the overall configuration of a third embodiment of the electronic musical instrument according to the present invention. First, the main functions of the electronic musical instrument shown in this third embodiment will be briefly explained. This electronic musical instrument has an upper keyboard (UK) which has keys corresponding to _C2 note to _C7 note arranged in a row, and a keyboard (UK) which has keys corresponding to _C2 note to _C7 note arranged in a row. It has a lower keyboard (LK) and a pedal keyboard (PK) in which keys corresponding to _C2 to _C4 are arranged in a row. Furthermore, this electronic musical instrument is similar to the electronic musical instruments of the first and second embodiments (Figs. 1 and 3).
As in the case shown in Fig. 1, there are two performance modes: "split mode" and "normal mode", and either mode is selected by mode selection switch _S1 .
In “split mode”, the upper keyboard (UK)
The key corresponding to the highest note of the pressed keys (corresponding to melody performance) is detected, and the musical tone of this key is sounded as a melody performance sound with a melody tone, and the pressed key (corresponding to accompaniment performance) on the lower keyboard (UK) is detected. The corresponding musical tones are produced as accompaniment performance sounds using accompaniment tones. In addition, in the case of "Normal mode", the key corresponding to the highest note of the keys pressed on the upper keyboard (UK) and lower keyboard (LK) is detected, and this newly detected highest note is pressed first. The musical tone of the newly detected highest pressed key is sounded as a melody performance sound with a melody tone, and the upper keyboard (UK) The musical tones of the pressed keys other than the highest pressed key on the lower keyboard (LK) are produced as accompaniment performance tones using accompaniment tones. In this "normal mode," the upper keyboard (UK) Or, it is possible to accurately detect the keys for melody performance that are pressed on the lower keyboard (LK). This point has already been discussed in the general description of the invention. Regarding the pedal keyboard (PK), in either the "split mode" or the "normal mode", the musical tone of the pressed key is produced as a bass performance tone with a bass tone. Next, the configuration of the main parts of the electronic musical instrument shown in this embodiment will be explained. In FIG. 5, 60 indicates a keyboard section,
As mentioned above, in this example, the upper keyboard (UK),
It consists of a lower keyboard (LK) and a pedal keyboard (PK). 61 detects the pressed keys of the upper keyboard (UK), lower keyboard (LK), and pedal keyboard (PK) for each keyboard, and generates encoded key information representing the keys (hereinafter referred to as key code). ), and is configured to sequentially output key codes KC representing each pressed key in a time-sharing manner. Further, this key press detection circuit 47 detects the key code KC in response to the output of the key code KC.
A keyboard identification signal U, L, or P indicating which key of the keyboard is pressed is output.
Signal U represents the upper keyboard (UK), signal L represents the lower keyboard (LK), and signal P represents the pedal keyboard (PK).
represents. In this case, the key code KC output from the key press detection circuit 61 is composed of a block code BC representing the octave range and a note code NC representing the note name (note). Block code BC of key code KC is a 3-bit signal
It consists of B ₃ to _{B 1} , and the relationship between its content and octave range is determined as shown in Table 1.
In addition, the note code NC is a 4-bit signal N ₄ ~
It consists of N ₁ , and the relationship between its contents and pitch names is determined as shown in Table 2.

【table】

【table】

[Table] The specific circuit configuration of the key press detection circuit 61 is disclosed in detail in, for example, Japanese Patent Application Laid-Open No. 52-23324; title of the invention is "Key Coder", so it will not be described in detail here. . Reference numeral 62 performs an operation of assigning each key code KC sent from the key press detection circuit 61 in a time-divisional manner to one of a plurality of sounding channels (in this embodiment, the number of channels is 15) that can be sounded simultaneously. This is the sound generation assignment circuit that executes the sound generation assignment circuit, which transmits the key code KC assigned to each sound generation channel and the key-on signal KON representing the state of the key corresponding to this assigned key code KC to the seventh sound generation channel for each sound generation channel.
It is configured to time-divisionally output parallel 8-bit signals in synchronization with each channel time shown in the timing chart of the figure. Note that the key-on signal KON is "1" while the key is pressed, and becomes "0" when the key is pressed.
This is a signal that becomes . In this embodiment, a sound generation channel is predetermined for each keyboard, and the sound generation assignment circuit 62 allocates the key code KC of the relevant keyboard to one of the predetermined sound generation channels. In this case, the keyboard identification signal U sent in synchronization with the key code KC determines which key each key code KC belongs to.
Or, L or P, and the key code KC is assigned to a predetermined sounding channel based on the signals U, L, and P. Table 3 shows an example of the sounding channels to which the key codes KC of each keyboard are assigned.

[Table] Note that the sound generation assignment circuit 62 is configured to hold and output the key code KC assigned to each sound channel even if the key corresponding to the key code KC is released. When the key is released, only the holding of the key-on signal KON is released and the key-on signal KON is set to "0". The reason why the key code KC is output even after the key is released is that the key code KC is necessary for the attenuation of the musical tone after the key is released. Then, when a new key code KC and key-on signal KON are assigned to the sound generation channel, the key code KC that was previously assigned to the sound generation channel and held is released and the new key code KC is assigned. The key code KC and key-on signal KON are held and output. Furthermore, as shown in the timing chart of FIG.
Channel signal UchT, LK channel signal LchT indicating the channel time of the sounding channel corresponding to the lower keyboard (UK), PK indicating the channel time of the sounding channel corresponding to the pedal keyboard (PK)
In addition to outputting the channel signal PchT, a timing signal is also output corresponding to the first channel time.
T ₁ , a timing signal T ₁ S corresponding to the first half of the first channel time, a clock φ corresponding to the 10th to 15th channel times, and a clock φ _B corresponding to the 2nd to 8th channel times, respectively. do. The specific circuit configuration of the sound generation allocation circuit 62 is disclosed in detail in, for example, Japanese Patent Application Laid-Open No. 54-34812 (title of the invention "Electronic Musical Instrument"), so it will not be described in detail here. 63 inputs the key code KC and key-on signal KON of each sound channel sequentially output from the sound generation assignment circuit 62, detects the key code KC corresponding to the pressed key of the melody performance, and outputs the key code.
This is a melody sound detection circuit that outputs KC as a melody key code KC*, and is configured as shown in FIG. 6, for example. Note that FIG. 6 will be explained in detail in the explanation of the operation described later. 64 is a melody sound forming circuit (single note configuration) that forms a musical sound signal of a melody performance sound, which sets the musical sound signal of the melody performance sound to a melody tone based on the melody key code KC* output from the melody sound detection circuit 63. The melody tone set by the device 65 is formed and output. 66 is an accompaniment/accompaniment unit that forms musical tone signals of accompaniment performance sounds and bass performance sounds.
The bass tone forming circuit (multitone configuration) generates the accompaniment based on the key code KC and key-on signal KON related to the accompaniment tone and the key code KC and key-on signal KON related to the bass tone, which are outputted in a time-sharing manner from an OR gate 72, which will be described later. A musical tone signal of the performance tone and a musical tone signal of the bass performance tone are formed with the accompaniment tone and bass tone set by the accompaniment tone color setting device 67 and the bass tone color setting device 68, respectively, and are output. Next, details of this electronic musical instrument will be explained along with its operation. (A) Split mode To set the "split mode", set the mode selection switch _S1 to the "split" side and set the mode selection signal NS to "0". In “split mode”, the upper keyboard (UK) is used to perform melody performance keys, the lower keyboard (LK) is used to perform accompaniment performance keys, and the pedal key (PK) is used to play bass notes. Perform key operations. In response to such key press operations, the key codes KC representing the pressed keys of each keyboard (UK), (LK), and (PK) are assigned to respective predetermined sound generation channels in the sound generation assignment circuit 62 (see Table 3). reference). The sound generation assignment circuit 62 sequentially outputs the key code KC and key-on signal KON assigned to each sound generation channel in synchronization with the time of each of the 1st to 15th channels (FIG. 7), and outputs the key code KC and key-on signal KON assigned to each sound generation channel sequentially in synchronization with the time of each of the 1st to 15th channels (FIG. 7).
It is supplied to AND gates 70 and 71. The melody sound detection circuit 63 is constructed, for example, as shown in FIG. 6, and the key code KC and key-on signal KON supplied to this circuit 63 are input to a gate circuit 80 and an AND gate 81, respectively. When the mode selection signal NS is "0" in "split mode", the AND gate 82 is inoperable, so only the UK channel signal UchT (Fig. 7) is output from the OR gate 83, and the gate circuit 80's enable terminal EN. Therefore, the gate circuit 80 is turned on only during the channel time of the second to eighth sounding channels corresponding to the upper keyboard (UK), and the key code KC of the channel is stored in the memory 84 and the comparison circuit 85.
Add it to the A input terminal of. The memory 84 changes the stored contents to the added key code KC when the write control terminal W becomes "1", and on the other hand, when the reset terminal R becomes "1" (strictly speaking, the terminal At the timing when R changes from “1” to “0”)
Clear the memory contents. The reset terminal R of the memory 84 is supplied with an initial clear signal IC and a timing signal _T1 (Fig. 7) via an OR gate 86.
is input, which causes the contents of memory 84 to be cleared at power up and at the end of the first channel time. The output (stored contents) of this memory 84 is supplied to the inputs of a latch circuit 87 and a comparison circuit 85. The comparison circuit 85 is a key code added to the A input.
KC is compared with the output of the memory 84 applied to the B input, and the key code KC applied to the A input is
If it is larger than the output of the memory 84 added to the input (A>B), a “1” signal is output, and the AND
It is supplied to the gate 81. The key-on signal KON mentioned above is applied to the other input of the AND gate 81, and the output of this AND gate 81 is sent to the memory 84.
is supplied to the write control terminal W of. AND gate 8
1 means that the key-on signal KON input to the gate circuit 80 is "1".
This means that the key corresponding to the key code KC output from is being pressed. Therefore, the key code KC output from the gate circuit 80 is larger than the memory content of the memory 84 (comparison output (A>B) of the comparison circuit 85 = "1"), and the key code
The key corresponding to KC is being pressed (signal KON=
"1" from AND gate 81 only if "1")
The signal is output and the corresponding key code KC is stored in the memory 84.
is memorized. As mentioned above, the contents of the memory 84 are cleared at the end of the first channel time, so the key code KC that is being pressed is first output from the gate circuit 80 during the second to eighth channel times. The key code KC stored in the memory 84 and subsequently output during the key press is larger than the key code KC stored in the memory 84 (it is on the treble side).
and the contents of the memory 84 are rewritten to the above-mentioned subsequently outputted key code KC, and the same process is repeated thereafter. The contents of the memory 84 at the end of the 8th channel time are the highest notes among the pressed keys assigned to the 2nd to 8th sounding channels, that is, the keys pressed on the upper keyboard (UK). The key code KC corresponds to the highest pitched key. The contents of this memory 84 are retained until the end of the first channel time of the next cycle. The key code KC stored in the memory 84 is applied to the latch circuit 87. A timing signal T 1 S (FIG. 7) which becomes " ₁ " in the first half of the first channel time is applied to the strobe terminal S of the latch circuit 87. Therefore, the latch circuit 87 receives the key code representing the highest pressed key stored in the memory 84 at the beginning of the first channel time.
KC is latched. The highest note pressed key detection operation as described above is performed in the first to
The execution is repeated in each cycle of 15 channel times, and as a result, the latch circuit 87 always outputs a key code KC (hereinafter, this key code will be referred to as MKC) representing the highest pressed key of the upper keyboard (UK). will be output. Key code output from latch circuit 84
MKC is supplied to a delay circuit 88. delay circuit 8
8 takes in the signal applied to the input terminal at the rising timing of the timing signal φ _A (Fig. 7) (at the start of the 10th channel time), and takes in the signal applied to the input terminal at the rising timing of the timing signal φ _B (at the starting point of the 2nd channel time). ) is configured to output. As a result, the key code MKC output from the latch circuit 87 is stored in the delay circuit 88 for approximately one cycle time (1st to 15th channel time is 1 cycle time).
After being delayed (cycle time), it is applied to the gate circuit 89. By the way, when the "split mode" is selected and the mode selection signal NS is "0", the signal
Input NS (“0”) via inverter 90
The output of OR gate 91 is always "1". As a result, the gate circuit 89 that inputs the output (“1”) of the OR gate 91 to the enable terminal EN is in an on state. Therefore, the key code KKC' output from the delay circuit 88 is output from the gate circuit 89.
The melody key code KC* is supplied to the melody tone forming circuit 64 shown in FIG. The melody sound forming circuit 64 forms a musical sound signal having a pitch corresponding to the input melody key code KC* and a melody tone set by the melody tone setting device 65, and outputs it to the sound system 76. Therefore, from the sound system 76, a musical tone corresponding to the highest note of the pressed keys for melody performance on the upper keyboard (UK) is produced as a melody performance sound. On the other hand, when the mode selection signal NS is “0”,
In Figure 5, this signal NS (“0”) is directly input.
AND gate 70 becomes inoperable and the signal
Input NS (“0”) via inverter 73
AND gate 71 becomes operational. The other input of AND gate 71 is connected to LK via OR gate 74.
A channel timing signal LchT and a PK channel timing signal PchT (FIG. 7) are added, as well as a key code KC and a key-on signal KON of each sound generation channel, which are output from the sound generation allocation circuit 62 in a time-division manner. Therefore,
The AND gate 71 is operable only during the 1st and 9th to 15th channel times, and the key code KC and key-on signal KON of the sounding channels corresponding to the lower keyboard (LK) and the pedal keyboard (PK) are activated.
is passed through and supplied to the accompaniment/bass tone forming circuit 66 via the OR gate 72. The accompaniment/bass sound forming circuit 66 converts the key code KC and key-on signal KON of each sound channel input in a time-division manner into a timing signal T ₁ and a clock φ.
(Fig. 7), the sound signals are parallelized for each sound channel, and in each sound channel, a musical tone signal with a pitch corresponding to the key code KC of the channel is formed by envelope control using the key-on signal KON (however, the upper keyboard In the sound generation channel corresponding to UK), the key code KC and the key-on signal KON are blocked by the AND gate 71 as described above, so no musical tone signal is formed). In this case, the accompaniment tone set by the accompaniment tone setting device 67 is given to the musical tone signals formed by the sound channels corresponding to the upper keyboard (UK) and the lower keyboard (LK), and The base tone set by the base tone setting device 68 is given to the musical tone signal formed by the sound generation channel corresponding to PK). The musical tone signal thus formed is supplied to the sound system 76 and generated. Therefore, from the sound system 76, musical tones corresponding to the pressed keys for accompaniment performance on the lower keyboard (LK) are produced as accompaniment performance sounds, and musical tones corresponding to the pressed keys for bass performance on the pedal keyboard (PK) are produced. Musical tones are produced as bass performance tones. Thus, in the "split mode" of this third embodiment, the same performance effect as in the "split mode" of the first or second embodiment described above can be obtained, and especially in this third embodiment, According to this method, the bass performance sound can be further generated with a bass tone. (B) Normal mode To set to "normal mode", set the mode selection switch _S1 to the "normal" side and set the mode selection signal NS to "1". In "normal mode", key presses for melody and accompaniment performance are performed on either the upper keyboard (UK) or lower keyboard (LK), and key presses for bass performance are performed on the pedal keyboard (PK). Then, as in the case of the above-mentioned "split mode", the key code KC and key-on signal KON assigned to each sound channel are output from the sound generation assignment circuit 62 in a time-division manner, and the melody sound detection circuit 63 and the AND The signal is supplied to gates 70 and 71. In the melody sound detection circuit 63, since the mode selection signal NS is "1", the AND gate 82
becomes operational, and the output of the inverter 90 is always "0". As a result, the gate circuit 80
UK channel signal UchT and LK channel signal LchT are applied to enable input terminal EN of gate circuit 8 through OR gate 83.
0 is the key code KC, key-on signal KON of the sounding channel that is on during the 2nd to 15th channel time and corresponds to the upper keyboard (UK) and lower keyboard (LK).
pass. memory 84, comparison circuit 85,
The highest note detection section consisting of the AND gate 81 and the latch circuit 87 operates in the same way as in the "split mode" described above, and detects the highest note among the pressed keys on the upper keyboard (UK) and lower keyboard (LK). A key is detected and a key code KC corresponding to the key is latched into the latch circuit 87 at the beginning of the first channel time of each cycle. The key code MKC of the highest pressed key latched in the latch circuit 87 is applied to the delay circuit 88, the A input of the mismatch circuit 92, and the A input of the adder circuit 96, respectively. Here, in the case of the above-mentioned "split mode", the gate circuit 89 is always on and the delay circuit 88 is turned on.
The key code MKC' output from the latch circuit 87 is output unconditionally, but in this "normal mode", the gate circuit 89 is turned on only when the key code MKC output from the latch circuit 87 satisfies a "predetermined condition". Then the key code MKC is sent to the delay circuit 8.
8. Output via gate circuit 89. The "predetermined condition" is that the new key code MKC output from the latch circuit 87 is not more than one octave (1200 cents) further away from the key code MKC' detected in the previous cycle on the bass side. , the gate circuit 89 is turned on only when this condition is satisfied, and when it is not satisfied (key code
If MKC is more than one octave away from the key code MKC' on the bass side), the gate circuit 89 will not turn on. This point will be explained in detail below. When the mode selection signal NS is "1", the output signal of the inverter 90 is "0", so the output of the OR gate 91 is determined only by the output signal of the DFF 94 (which performs the same delay operation as the delay circuit 88). be done. Comparison circuit 95 and addition circuit 96 detect whether the key code MKC of the newly detected highest pressed key output from latch circuit 87 satisfies the above-mentioned "predetermined condition". The key code MKC output from the latch circuit 87 is input to the A input of the adder circuit 96, and the key code MKC output from the latch circuit 87 is input to the B input.
Data “0010000” is input via AND gate 97. As is clear from Table 1 above, the data "0010000" is a value corresponding to one octave of the key code KC. Therefore, the adder circuit 96 adds 1 from the key code MKC by adding the key code MKC and the data "0010000".
Outputs an octave higher key code (MKC+10ct). This key code (MKC+10ct) is applied to the A input of the comparison circuit 95. The key code MKC' output from the delay circuit 88 is added to the B input of the comparison circuit 95, and the comparison circuit 95 outputs "1" when the key code (MKC+10ct) is larger than the key code MKC'(A>B). ” Outputs a signal.
As mentioned above, the delay circuit 88 delays the key code MKC of the highest pressed key output from the latch circuit 87 by approximately one cycle, so the key code output from the delay circuit 88
MKC' represents the highest pressed key detected in the previous cycle. Therefore, if the newly detected highest pressed key (key code MKC) is not more than one octave away from the previously detected highest pressed key (key code MKC') on the bass side (of course, the new highest A "1" signal is output when the pressed key is higher than the previous highest pressed key), and a "0" signal is output when the pressed key is one octave or more away from the bass side. The output signal of the comparator circuit 95 is sent to an AND gate 98,
It is input to the DFF 94 via the OR gate 99.
The output signal of the NOR gate 102 is inverted by an inverter 101 and input to the AND gate 98 for data acquisition, and the output signal of the NOR gate 102 is directly input to the AND gate 100 for memory retention. The inconsistency determination circuit 92 detects the key code MKC of the newly detected highest pressed key which is added to the A input.
is compared with the key code MKC′ of the previously detected highest pressed key that is added to the B input, and the key code is
MKC and key code MKC′ are different (A=B)
At this time, a “1” signal is output and supplied to the NOR gate 102. Therefore, if the newly detected key code MKC of the highest pressed key is different from the previously detected key code MKC' of the highest pressed key (that is, when the highest pressed key changes), the mismatch determination circuit 92 outputs a "1" signal. is output, which causes NOR gate 1
The output signal of 02 becomes “0” and the AND gate 9
8 becomes operational and AND gate 100
becomes inoperable. As a result, if the newly detected highest pressed key is higher than the previous highest pressed key, or is less than one octave away from the lowest pressed key, the comparator circuit 95 outputs a "1" signal. Therefore, this “1” signal is sent to the AND gate 98,
It is input to the DFF 94 via the OR gate 99.
On the other hand, if the newly detected highest pressed key is one octave or more away from the previous highest pressed key on the bass side, a "0" signal is input to the DFF 94. In this case, if the newly detected highest key pressed is the same as the previous highest pressed key (MKC=
MKC'), the discrimination circuit 92 does not output a "1" signal, and the output signal of the NOR gate 102 is "1".
As a result, the output signal of DFF94 becomes AND
The signal is directly fed back to the input side of the DFF 94 via the gate 100. Note that the NOR gate 102 includes a latch circuit 8.
Bit N ₁ of key code MKC output from 7,
The output signal of the NOR gate 103 with inputs N ₂ and N ₃ is added, but this is to release the memory of the DFF 94 when all the pressed keys are released. In other words, when all pressed keys are released,
The highest pressed key is not detected and the contents of the key code MKC are all bits "0". As a result, the output signal of NOR gate 103 becomes "1" and the output signal of NOR gate 102 becomes "0". As long as the highest pressed key exists (if there is even one pressed key), bits N ₁ , N ₂ of key code MKC,
Since any one of _N3 is always "1" (see Table 2), the output signal of NOR gate 103 is "0". An initial clear signal IC is also input to the NOR gate 102, so that the contents of the DFF94 are cleared when the power is turned on. In this way, each time the latch circuit 87 outputs the newly detected key code MKC of the highest pressed key, a comparison process is performed between the key code MKC and the previous key code MKC' of the highest pressed key. signal indicating the result (“1” or “0”)
is input to the DFF94. The signal input to DFF94 is delayed by one cycle and then output.
It is supplied to the gate circuit 89 via the OR gate 91. At this time, the key code MKC has just been input to the gate circuit 89 via the delay circuit 88, and the timings of both are completely coincident.
If the above key code MKC satisfies the "predetermined conditions", the output signal of DFF94 will be "1".
Then, the gate circuit 89 is turned on, and if the condition is not satisfied, the output signal of the DFF 94 becomes "0" and the gate circuit 89 is turned off. By the way, the output signal of DFF94 is OR gate 9
1 and is also added to AND gate 97. If the output signal of the DFF94 is “1”, a “1” signal is output from the AND gate 97 and the data “0010000” is input to the B input of the adder circuit 96.
is input, and the above-mentioned operation is performed. but,
When the output signal of the DFF 94 is "0", the AND gate 97 becomes inactive and "0000000" is input to the B input of the adder circuit 96. As a result, the adder circuit 96 supplies the key code MKC output from the latch circuit 87 to the A input of the comparator circuit 95 as it is. Therefore, in this case, the comparison circuit 95 selects the newly detected highest note pressed key (key code
MKC) is the highest note pressed last time (key code)
A "1" signal is output only when the pitch is higher than MKC'), and a "0" signal is output otherwise. That is, in this embodiment, when the key code MKC' of the previously pressed key is in the output prohibited state (the output signal of the DFF94 is "0", the gate circuit 8
9 is off), instead of determining whether the new highest-pitched key is one octave or more away from the previous highest-pitched key on the bass side, it determines whether the pitch is higher. I try to do that. By performing such processing, it is possible to prevent the key code KC (MKC') of the highest pressed key, which is lower than the highest pressed key whose output is prohibited, from being output. In this way, in the "normal mode", the melody tone detection circuit 63 detects the highest pressed key among the pressed keys on the upper keyboard (UK) and the lower keyboard (LK), and also detects the new highest pressed key. Compare the note pressed key and the previous highest note pressed key,
When the new highest note pressed key is on the higher note side than the previous highest note pressed key, the key code of the new highest note pressed key is output, and when the new highest note pressed key is on the lower note side than the previous highest note pressed key, the new highest note The key code of the new highest pressed key is output only when the pressed key is not more than one octave away from the previous highest pressed key on the bass side. However, in this case, if the previous highest pressed key is in the output prohibited state, the key code of the new highest pressed key will be No output. Therefore, this detection circuit 63
The key code (MKC') output from always corresponds to the key pressed in the melody performance. That is, even if the pressed key for the accompaniment performance is detected as the highest pressed key when there is no longer a pressed key for the melody performance, the key code of the highest pressed key is prohibited from being output due to the above conditions. The key code MKC' output from the gate circuit 89 of the melody sound detection circuit 63 is supplied as the melody key code KC* to the melody sound forming circuit 64 shown in FIG. The melody sound forming circuit 64 forms a musical sound signal corresponding to the melody key code KC* with a melody tone and outputs it to the sound system 76 in the same way as in the above-mentioned "split mode". Therefore, from the sound system 76, only musical tones corresponding to the keys pressed for melody performance on the upper keyboard (UK) and lower keyboard (LK) are produced as melody performance sounds. On the other hand, in “normal mode” mode selection signal NS
When is "1", AND gate 70 is enabled and AND gate 71 is disabled. The output signal of the OR gate 75 is applied to other inputs of the AND gate 70, as well as the key code KC of each sound generation channel and the key-on signal KON output from the sound generation allocation circuit 62 in a time-division manner. The output signal of the normal melody effect switch S ₂ and the output signal of the mismatch determination circuit 69 are input to the OR gate 75, but in this case, the output signal of the normal melody effect switch S ₂
is off, the output signal of the OR gate 75 is only the output signal of the discrimination circuit 69. Mismatch determination circuit 6
The key code KC output from the sound generation allocation circuit 62 is input to the A input of 9, and the melody key code KC* output from the melody sound detection circuit 63 is input to the B input. The discrimination circuit 69 is a key code KC and a melody key code KC*
When they do not match (A=B), a "1" signal is output, and when they match (A=B), a "0" signal is output. As a result, the discrimination circuit 69 outputs a "0" signal only during the channel time when the same key code KC as the melody key code KC* is output from the sound generation allocation circuit 62. Therefore,
The AND gate 70 becomes inoperable only during the channel time of the sound channel to which the same key code as the melody key code KC* is assigned, and blocks the key code KC and the key-on signal KON,
At other channel times, key code KC*,
Pass the key-on signal. Key code KC and key-on signal KON output from AND gate 70
is supplied to the accompaniment/bass tone forming circuit 66 via the OR gate 72. The accompaniment/bass tone forming circuit 66, as explained in the case of the above-mentioned "split mode",
Key code of each channel for each pronunciation channel
KC forms a musical tone signal based on the key-on signal KON. In this case, the musical tone signals formed in the sounding channels (2nd to 15th sounding channels) corresponding to the upper keyboard (UK) and lower keyboard (LK) are given an accompaniment tone, and are also given accompaniment tones corresponding to the pedal keyboard (PK). The musical tone signal formed in the sounding channel (first sounding channel) is given a base timbre. Therefore, from the sound system 76, musical tones corresponding to the pressed keys of the upper keyboard (UK) and the lower keyboard (LK), excluding the pressed keys for melody performance, are produced as accompaniment performance sounds, A musical tone corresponding to a pressed key on a pedal keyboard (PK) is produced as a bass performance tone. In addition, in this “normal mode”, if you turn on the normal melody effect switch S ₂ , the OR
The output signal of the gate 75 is always "1", and as a result, the AND gate 70 is enabled to operate for all channels, and the key code KC of all sound channels is set.
Key-on signal KON accompaniment/bass sound forming circuit 6
Supply to 6. As a result, accompaniment performance sounds are also generated for keys that are pressed for melody performance. Thus, in the "normal mode" of this third embodiment, similarly to the "normal mode" in the first or second embodiment described above, the upper keyboard (UK) and the lower keyboard (LK) can be played without distinction between the keys. The pressed keys for melody performance and the pressed keys for accompaniment performance are automatically identified, and the melody performance sound and the accompaniment performance sound can be generated in different musical tone modes (timbres). Moreover, in this case, even if the key depressions for the melody performance are interrupted, the melody performance sounds will not be generated in response to the key depressions for the accompaniment performance. In the third embodiment, the sound production of the melody performance sound corresponding to the highest pressed key was controlled by controlling the gate circuit 89 (FIG. 6) on and off, but instead of this, For example, a gate circuit is inserted on the output side of the melody sound forming circuit 64, and this gate circuit is connected to the OR gate 91 (sixth
The on/off control may be performed using the output signal shown in the figure). Needless to say, in this case, the gate circuit 89 is unnecessary. In addition, in the "normal mode" of the third embodiment, when detecting whether or not the new highest pressed key is further away from the previous highest pressed key by more than a predetermined pitch on the bass side, the predetermined pitch is set to "one octave". However, this predetermined pitch can be set arbitrarily. In this case, it is also possible to prepare a plurality of data (for example, 2 octaves, 1.5 octaves, 1 octave, 0.5 octave, etc.) as the predetermined pitches so that the performer can freely select them. Further, in this third embodiment, the keyboard section 60 is composed of an upper keyboard (UK), a lower keyboard (LK), and a pedal keyboard (PK), but it is composed of only an upper keyboard (UK) and a lower keyboard (LK). It is also possible to configure the keyboard with a single keyboard as in the first and second embodiments. When configured with a single-level keyboard, the upper keyboard (UK) is replaced by the high-pitched keyboard range (1a in Figures 1 and 3), and the lower keyboard (LK) is replaced by the low-key range (1a in Figures 1 and 3). 1b in Figures 1 and 3)
replaced by As explained above, according to the present invention, in an electronic musical instrument in which the normal mode and the split mode can be switched and selected, the melody performance sound and the accompaniment performance sound are produced in different musical tones (timbres) even in the normal mode. This significantly improves playability. In particular, according to the present invention, even if the key presses for the melody performance are interrupted in the normal mode and only the key presses for the accompaniment performance are performed, the melody performer will still be able to produce sounds in response to the key presses for the accompaniment performance. This has the excellent effect of preventing the risk of injury.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of a first embodiment of an electronic musical instrument according to the present invention, FIG. 2 is a detailed circuit diagram showing an example of the New Key highest note detection circuit in FIG. 1, and FIG. 3 is an electronic musical instrument according to the present invention. second instrument
The overall configuration block diagram showing the embodiment, FIG.
FIG. 5 is an overall configuration block diagram showing a third embodiment of the electronic musical instrument according to the present invention; FIG. 6 is a melody sound detection circuit shown in FIG. 5. FIG. 7 is a timing chart showing the temporal relationship of various timing signals used in FIG. 5. 1, 60...keyboard section, 2...highest note detection circuit,
3...Newki highest pitch detection circuit, 7, 32, 64
...Melody sound forming circuit, 8, 10, 65, 6
7, 68... Tone setting device, 9, 33... Accompaniment tone forming circuit, 30... Multiplexer, 61... Key press detection circuit, 62... Sound generation assignment circuit, 66... Accompaniment/bass tone forming circuit.

Claims (1)

[Scope of Claims] 1. A keyboard section having a first key range and a second key range, first and second musical sound generating means that generate musical sounds in mutually different manners, and a "split" performance mode. mode selection means for selecting either "mode" or "normal mode"; and when "split mode" is selected by said mode selection means, a mode selection means for selecting either "split mode" or "normal mode"; a first control means for generating a musical tone from the first musical tone generating means and generating a musical tone corresponding to a pressed key in the second keyboard range from the second musical tone generating means; When the "normal mode" is selected by the selection means, the highest pressed key is detected from among the pressed keys in the first and second key ranges, and the highest pressed key is detected as a newly pressed key. If the key is a pressed key, the musical tone corresponding to the highest pressed key is generated from the first musical tone generating means, and the musical tone corresponding to the highest pressed key is generated from each pressed key or each pressed key in the first and second key ranges. An electronic musical instrument comprising: second control means for causing the second tone generation means to generate musical tones corresponding to the remaining pressed keys other than the pressed key. 2. The keyboard section is composed of a single-stage keyboard, and the
The key area and the second key area are a treble side key area and a bass side key area, respectively, and the first and second musical tone generating means generate musical tones with a melody tone and an accompaniment tone, respectively. An electronic musical instrument according to claim 1. 3. The keyboard section is composed of an upper keyboard and a lower keyboard, the first and second keyboard areas are the upper keyboard and the lower keyboard, respectively, and the first and second musical tone generating means generate a melody tone and an accompaniment tone, respectively. 2. The electronic musical instrument according to claim 1, which generates musical tones. 4. The first musical tone generation means has a single-note configuration, and the first control means detects the highest pressed key from among the pressed keys in the first key range, and generates the musical tone corresponding to the highest pressed key. 2. The electronic musical instrument according to claim 1, wherein said first musical tone generating means generates a musical tone. 5 A keyboard section having a first key range and a second key range, first and second musical sound generating means that generate musical sounds in mutually different manners, and a performance mode set to "split mode" or "normal mode"; mode selection means for selecting one of the two modes, and in a state in which the mode selection means selects the "split mode", the musical tone corresponding to the pressed key in the first keyboard range is selected from the first mode. a first control means for generating a musical tone corresponding to a pressed key in the second keyboard range from the second musical tone generating means; mode" is selected, the highest pressed key is detected from among the pressed keys in the first and second key ranges, and the highest pressed key is lower than the previous highest pressed key. Only when the distance is not more than a predetermined pitch, a musical tone corresponding to the highest pressed key is generated from the first musical tone generating means, and from each pressed key or each pressed key in the first and second key ranges. An electronic musical instrument comprising: second control means for causing the second musical tone generation means to generate musical tones corresponding to the keys pressed except for the highest pressed key. 6. The keyboard section is composed of a single-stage keyboard, and the first
The key range and the second key range are the treble side key area and the bass side key area, respectively, and the first and second key areas are
3. The electronic sample instrument according to claim 2, wherein the musical tone generating means generates musical tones with a melody tone and an accompaniment tone, respectively. 7. The keyboard section is composed of an upper keyboard and a lower keyboard, the first and second keyboard areas are the upper keyboard and the lower keyboard, respectively, and the first and second musical tone generating means generate a melody tone and an accompaniment tone, respectively. The electronic musical instrument according to claim 2, which generates musical tones. 8. The first musical tone generation means has a single-note structure, and the first control means detects the highest pressed key from among the pressed keys in the first key range, and generates the musical tone corresponding to the highest pressed key. 3. The electronic musical instrument according to claim 2, wherein said first musical tone generating means generates said musical tone.