JP5011033B2 - Electronic musical instruments - Google Patents

Description

  The present invention relates to an electronic musical instrument, and more particularly to an electronic musical instrument that can set an appropriate portamento time according to a performance mode.

2. Description of the Related Art Conventionally, electronic musical instruments that perform portamento that gradually changes from one pitch to another are known. In addition, electronic musical instruments have been proposed that simulate playing trombone with keyboard performance. In Japanese Patent No. 2678281 (Patent Document 1), the portamento time is set according to the pitch difference between the previous key press and the current key press and the time difference between the previous key press and the current key press. An electronic musical instrument is disclosed.
Japanese Patent No. 2678281

  However, in the technique disclosed in Patent Document 1, the portamento time or portamento speed is determined by the difference in pitch between the previous key press and the current key press and the time difference between the previous key press and the current key press. However, there is a problem that it is not always possible to obtain a portamento that matches the performance. That is, since the portamento time is set according to the time difference between the previous key press and the current key press, the current key press time (the time from key press to key release) or the next key press It is set regardless of the time difference until the key is pressed. For example, if the time difference between the previous key press and the current key press is short, even if the key press time of the current key press is long, the portamento time is set to be short according to the technique disclosed in Patent Document 1. However, when the key pressing time of this key pressing is long, it is preferable that the portamento time is long. Conversely, if the time difference between the previous key press and the current key press is long, the portamento time is set long even if the key press time of this key press is short, but the key press time of this key press is Is shorter, the portamento time is preferably shorter.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electronic musical instrument capable of setting an appropriate portamento time according to a performance mode.

  In order to solve the above-mentioned problem, the electronic musical instrument according to claim 1 is provided with an input means for inputting note-on information for instructing the start of generation of a musical tone of a predetermined pitch and note-off information for instructing the stop of the musical sound Instructing the sound source that generates musical sound according to the information input by the input means, and inputting the first note-on information by the input means and corresponding to the first note-on information When the second note-on information is input before the note-off information to be input, the second pitch indicated by the second note-on information is changed from the first pitch indicated by the first note-on information. Portamento control means for controlling the sound source so as to change the pitch at a predetermined speed, and after inputting second note-on information to the input means, note-off information corresponding to the first note-on information is input. If entered And a speed changing means for changing the speed at which the first pitch indicated by the note information changes from the first pitch indicated by the second note-on information to be higher than the predetermined speed. .

  According to a second aspect of the present invention, in the electronic musical instrument of the first aspect, when the second note-on information is input to the input means and note-off information corresponding to the first note-on information is input. Time measuring means for measuring time with time is provided, and the speed changing means changes the speed according to the time measured by the time measuring means.

  The electronic musical instrument according to claim 3 is the electronic musical instrument according to claim 1, wherein the note-off information input to the input means includes off-velocity information indicating a key release speed, and the speed changing means includes: The speed is changed according to off-velocity information included in the note-off information input to the input means.

  An electronic musical instrument according to a fourth aspect of the invention is the electronic musical instrument according to any one of the first to third aspects, further comprising a change curve storage unit that stores a change curve indicating a pitch change with time, and the portamento control unit includes: The pitch change is controlled by reading the change curve stored in the change curve storage means sequentially at a predetermined speed in accordance with the passage of time, and the speed change means is stored in the change curve storage means by the portamento control means. The pitch change rate is changed by changing the readout speed of the change curve.

  According to the electronic musical instrument of the first aspect, the first note-on information is inputted by the input means, and the second note-on information is inputted before the note-off information corresponding to the first note-on information is inputted. In this case, the portamento control means sets the sound source so as to change the pitch at a predetermined speed from the first pitch indicated by the first note-on information to the second pitch indicated by the second note-on information. And when the note-off information corresponding to the first note-on information is input after the second note-on information is input to the input unit, the speed changing unit controls the second note-on information from the first pitch. Change so that the speed to change to high is faster than the predetermined speed. Therefore, when note-off information corresponding to the first note-on information is input early, the speed is changed quickly, so the second pitch is reached quickly, and note-off information is input late. If this happens, the second pitch will be reached later. If the key press time of this key press is short, there is a tendency to release the key corresponding to the previous key press earlier. Conversely, if the key press time of this key press is long, the previous key press Since there is a tendency to release the key corresponding to the key later, a portamento time corresponding to the key pressing time of this key pressing can be obtained by natural performance.

  Also, if the performer tries to shorten the portamento time, the player should release the key corresponding to the previous key press earlier, and if the player wants to increase the portamento time, the player should release the key corresponding to the previous key press later. The portamento time can be adjusted arbitrarily. Therefore, there is an effect that it is possible to set an appropriate portamento time according to the performance mode.

  According to the electronic musical instrument of the second aspect, in addition to the effect produced by the electronic musical instrument of the first aspect, when the second note-on information is input to the input means and the note-off corresponding to the first note-on information. It has time measuring means for measuring the time from when the information is input, and the speed changing means changes the speed according to the time measured by the time measuring means, so that the release of the key corresponding to the previous key depression is performed. There is an effect that the portamento time can be changed more appropriately according to the timing.

  According to the electronic musical instrument according to claim 3, in addition to the effect produced by the electronic musical instrument according to claim 1, the note-off information input to the input means includes off-velocity information indicating a key release speed, The changing means changes the speed according to the off-velocity information included in the note-off information input to the input means. Therefore, according to the key release timing corresponding to the previous key depression and the off-velocity of the key release. The portamento time can be changed, and the performance expression can be enriched.

  According to the electronic musical instrument of the fourth aspect, in addition to the effect produced by the electronic musical instrument according to any one of the first to third aspects, the change curve storage means stores a change curve indicating a pitch change with time. The portamento control means controls the pitch change by reading the change curve stored in the change curve storage means sequentially at a predetermined speed as time elapses, and the speed change means is controlled by the portamento control means. Since the change speed of the pitch is changed by changing the reading speed of the change curve stored in the above, there is an effect that the pitch change can be smoothly performed instead of linearly.

  Hereinafter, a preferred first embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing an electrical configuration of an electronic musical instrument 1 according to an embodiment of the present invention. The electronic musical instrument 1 includes a CPU 2 (central processing unit), a ROM 3 (read only memory) storing a control program 3a executed by the CPU 2, a memory area for work when the CPU 2 executes the control program, and the like. RAM 4 (Random Access Memory) having a display, an operation panel 5 provided with an operator for instructing the electronic musical instrument 1, and a display for displaying parameters set by the operation element, and conforming to the MIDI standard A MIDI interface (I / F) 6 for inputting the performance information, a sound source 7 for generating a musical sound signal corresponding to the performance information input by the MIDI interface 6, and a D / A converter 8 are mainly provided. Yes.

  Connected to the MIDI interface 6 is a MIDI keyboard device 20 that outputs performance information conforming to the MIDI standard in accordance with the operation of the keyboard. The D / A converter 8 is connected to a musical tone output by the D / A converter 8. Is connected to the amplifier 21, and a speaker 22 that emits the musical sound amplified by the amplifier 21 is connected to the amplifier 21.

  The CPU 2 is provided with a timer 2a that measures the time when the pitch of the musical sound generated by the sound source 7 is changed over time. The timer 2a is configured to generate an interrupt to the CPU 2 every time a predetermined time (for example, 1 msec) is measured.

  The ROM 3 stores a control program 3a, a sine table 3b, various constants, and the like corresponding to the processing of the flowcharts shown in FIGS. The sine table 3b is a table that stores an output value sinx corresponding to the input value x. This is referred to when portamento is performed, and an instruction is given to the sound source so that the pitch changes. Details will be described later.

  The RAM 4 is provided with a temporary memory 4a that stores performance information input last time, performance information input this time, flags, and the like. The temporary memory 4a stores input note information, calculated portamento time, and the like.

  The tone generator 7 is configured to store waveforms of various musical sounds, and to generate musical sounds of digital signals by reading out the waveforms instructed by the CPU 2. The digital signal output from the sound source 7 is converted into an analog signal by the D / A converter 8 and input to the amplifier 21.

  The information instructed to the sound source 7 is in a format compliant with the MIDI standard. Information for instructing the generation of musical sound is instructed by note-on information, information for instructing to stop the generation of musical sound is instructed by note-off information, and note-on information. Information instructing to change the pitch is referred to as pitch bend information. The note-on information includes status information indicating that the information is note-on information, note information indicating the pitch of a musical tone to be generated, and on-velocity information indicating a key pressing speed. The note-off information includes status information indicating that the information is note-off information, note information for instructing the pitch of a musical tone to stop sound generation, and off-velocity information indicating a key release speed. In addition, the pitch bend information indicates the pitch range for changing the pitch higher or lower than the pitch indicated by the status information indicating that the information is pitch bend information and the note-on information of the currently sounding tone. Bend value information to be included.

  Next, the outline of the operation of the portamento of the present invention will be described with reference to FIG. FIG. 2 is a graph showing the pitch change in the portamento operation, in which the horizontal axis indicates time (unit: msec) and the vertical axis indicates pitch (unit: semitone).

  In order to facilitate understanding of the portamento operation of the present invention, FIG. 2 (a) shows the operation of the portamento according to the present invention, and FIG. 2 (b) compares the operation of the conventional portamento. In both figures, the horizontally long rectangles shown as note A and note B indicate the period from when note-on information is input to when note-off information is input, and the horizontal center line of the rectangle is the note Indicates the pitch.

  In these figures, note-on information of note A is input at time t1, then note-off information of note B is input at time t2, and then note-off information of note A is input at time t4. In this case, note-off information of note B is input at time t5. The pitch of note B is assumed to be 5 degrees (7 semitones) higher than the pitch of note A, and the pitch of the musical sound generated by sound source 7 is indicated by a solid line or a dashed line.

  In this embodiment, when the note-on information of the current key press (note B) is input before the note-off information corresponding to the previous key press (note A in FIG. 2) is input, the legato performance is performed. It is assumed that portamento is performed when the legato performance is performed. Therefore, if it is not a legato performance, portamento is not performed, and the sound source 7 is instructed to start generating a musical tone having a pitch indicated by the current note-on information.

  FIG. 2B is a graph showing the pitch change due to conventional portamento. When note-on information of note A is input at time t1, sound source 7 starts to generate a musical tone of note A pitch. To do. Next, when note-on information of note B is input at time t2, the musical sound generated by the sound source 7 is portamento because it is a legato performance. Specifically, the pitch starts to change from the pitch of note A toward the pitch of note B, and reaches the pitch of note B at time t3. The note off information of note A is input at time t4, but the tone generated by the sound source 7 does not change at all. In this case, the portamento time T is the time from time t2 to time t3.

  FIG. 2A is a graph showing a pitch change due to portamento according to the present invention. As in FIG. 2B, when note-on information of note A is input at time t1, first, the sound source 7 is Then, generation of a musical tone having the pitch of note A is started. Next, when note-on information of note B is input at time t2, since it is a legato performance, the musical sound generated by the sound source 7 starts portamento and goes from the pitch of note A to the pitch of note B. Begin to change.

  When note-off information of note A is input at time t4, the gradient of pitch change increases. That is, the rate of change increases, and as a result, the pitch of note B is reached at time t3 '. This is shown by the solid line. In this case, the portamento time T is the time from the time t2 to the time t3 ', and is shorter than the case shown in FIG.

  When note-off information of note A is input at t4 'after time t4, the pitch change is similarly changed so as to increase. As a result, the pitch of the note B is reached at time t3 ″. In this case, the portamento time T is the time from time t2 to time t3 ″, which is longer than the previous case indicated by the solid line. This situation is indicated by a one-dot chain line.

  In addition, as the solid line and the alternate long and short dash line are drawn in parallel, the change speed of the portamento after the change is the same, and is changed to, for example, twice a predetermined speed. Therefore, if the note A is released early after the note B is pressed and the note A is turned off early, the note B pitch is reached quickly, and the portamento time T is greatly shortened. However, if the note A is released lately after the note B is depressed and the note off of the note A is inputted late, the pitch of the note B is reached late, and the portamento time T is not shortened much. become.

As described above, the time from when the pitch starts to change from the pitch of note A to the time when it reaches the pitch of note B is called portamento time T. Portamento time T is the note-on information of note B Is first determined by the pitch difference between note A and note B. When portamento time is T (unit: msec), pitch difference between note A and note B is I (unit: semitone), and constants are A and B, portamento time T is Calculated by Equation 1.
T = A × [B × (I−6) +1] (1)
The constant A is 500, for example, and the constant B is 0.1, for example. These constants may be arbitrarily set by the user.

  When the note-on information of the note B is input, the portamento time T is set in this way, and the speed of the pitch change is determined. In the operation of the portamento of the present invention, when note-off information of note A is input next, this change speed is changed rapidly.

  The portamento time T is not the length corresponding to the time from the previous note-on (here, note A) to the current note-on (here, note B), but the length of the current note-on (key press time) or It is preferable to set the length according to the time until the next note-on. In general, if the current key press time is long or the time until the next note-on is long, the note-off corresponding to the previous note-on is entered late, and if the current key-press time is short or When the time until note-on is short, note-off corresponding to the previous note-on tends to be input earlier. Therefore, as in the present invention, the portamento time T corresponding to the current key pressing time can be set by changing the portamento speed faster at the key release timing corresponding to the previous key pressing.

  2 (a) and 2 (b) have described the case where the pitch change is a straight line, the pitch change along the S-shaped curve may be performed in order to smooth the pitch change. Good. FIG. 2C shows a case where the pitch change is changed to a sine wave (sine) shape.

  FIG.2 (c) is a graph which shows a mode that a pitch change changes to a sine wave form. The change in pitch indicated by the solid line is due to the prior art, and when the note-on information of note B is input, the shape of the sine wave is determined, and the pitch of note A reaches the pitch of note B. Even if note-off information of note A is input, the sine curve is not changed. The pitch change indicated by the alternate long and short dash line indicates the case according to the present invention, and when the note-off information of note A is input, it is changed so that the speed of reading the sine curve is increased.

When the pitch is changed in a sine wave shape, the pitch is calculated based on a sine function. This sine function uses a function from −π / 2 (−90 degrees) to + π / 2 (+90 degrees) when the pitch is gradually increased, and + π / when the pitch is gradually decreased. A function from 2 (+90 degrees) to + 3π / 2 (+270 degrees) is used. This function is stored in the sine table 3b. Portamento time is T, current time is t after the start of pitch change, t is the pitch change range at time t when the pitch is gradually increased, PUp, and pitch is gradually decreased In this case, if the change width from the pitch of the note A at the current time t (hereinafter referred to as “bend value”) is PDw, PUp and PDw are calculated by the following formulas 2 and 3, respectively. The sine function is stored in the sine table 3b of the ROM 3, and the sine value is obtained by referring to the sine table 3b.
PUp = (I / 2) × {sin (((π × t) / T) −π / 2) +1} (2)
PDw = (I / 2) × {sin (((π × t) / T) + π / 2) −1} (3)
These values of PUp or PDw are calculated at predetermined time intervals and output to the sound source 7 as pitch bend information. Therefore, the sound source 7 generates a musical sound that smoothly and gradually changes the pitch according to a partial curve of the sine wave.

  As shown in FIG. 2 (c), according to the present invention, when note-on information of note B is input at time t2, portamento according to a sine curve is started. Next, when note-off information of note A is input at time t4, for example, time t is advanced twice as fast. That is, if the bend value is calculated using Formula 1 or 2 every predetermined time, the predetermined time is halved. Alternatively, without changing the predetermined time, the time t after the note-off information of the note A is input is doubled, and the bend value is calculated by Expression 2 or Expression 3. By doing so, the portamento time T is shortened, and the pitch of the note B is reached at time t3 '.

  Next, processing for performing the portamento operation shown in FIG. 2C will be described with reference to FIGS. 3 and 4. FIG. 3 is a flowchart showing the main process, and FIG. 4 shows a timer interrupt process that is executed in response to a timer interrupt that is generated by the timer 2a every predetermined time, in which the timer interrupt is permitted in the main process. It is a flowchart.

  First, the main process will be described with reference to FIG. This main process is started when note-on information or note-off information is input. Note that when the electronic musical instrument 1 is powered on, the CPU 2 prohibits timer interruption.

  In this main process, first, it is determined whether or not the input event type is note-on information (S1). If the type of the input event is note-on information (S1: Yes), it is determined whether or not it is a legato performance (S2). When this note-on is input, if it is before inputting the note-off information corresponding to the previously-input note-on information, it is assumed that the performance is legato, and is indicated by the previously-input note-on information. The sound source 7 is instructed to perform portamento from the pitch to the pitch indicated by the current note-on information. On the other hand, if it is not a legato performance, the sound source 7 is instructed to start generating a musical tone having a pitch indicated by the note-on information.

  If the current note-on information is a legato performance (S2: Yes), the pitch difference I between the pitch of note A and the pitch of note B is calculated, and the calculated pitch difference I is expressed by Equation 1. The portamento time T is calculated by substituting for, and the portamento time T is set to start the portamento (S4). The calculated pitch difference I and portamento time T are stored in the temporary memory 4a. Next, a variable t indicating a time after the start of portamento is set to 0 (S5), and timer interruption is permitted (S6).

  If it is determined in the determination process of S2 that it is not a legato performance (S2: No), the input note-on information is transmitted to the sound source 7 (S3).

  On the other hand, when the event input in the determination process of S1 is not note-on information (S1: No), it is determined whether the input event is note-off information and portamento is started (S7). . This determination is made based on the variable t. If the variable t is not 0, portamento is started, and if the variable t is 0, portamento is not started.

  If portamento is started (S7: Yes), the portamento time T is changed (S8). As a method for changing the portamento time T, as described above, for example, the timer interruption time is set to a half time from a predetermined value.

  When the process of S8 is completed, or when it is determined that portamento is not performed in the determination process of S7 (S7: No), the note-off information is sent to the sound source 7 (S9). When the process of S3, S6 or S9 is finished, this main process is finished.

  Next, the timer interrupt process will be described with reference to FIG. FIG. 4 is a flowchart showing the timer interrupt process. This timer interrupt process is an interrupt process that is started every time the timer 2a times a predetermined time.

  In this timer interruption process, first, 1 is added to the variable t that measures the time after the start of portamento (S21). Next, it is determined whether or not the pitch of note A is lower than the pitch of note B (S22).

  When the pitch of the note A is lower than the pitch of the note B (S22: Yes), the bend value is obtained by substituting the current time t, the portamento time T and the pitch difference I stored in the temporary memory 4a into Equation 2. PUp is calculated (S23). Next, it is determined whether or not the calculated bend value PUp is smaller than the pitch difference I (S24). If the bend value PUp is not smaller than the pitch difference I (S24: No), timer interruption is prohibited. (S25).

  When the calculated bend value PUp is smaller than the pitch difference I (S24: Yes), or when the process of S25 is completed, the bend value PUp is sent to the sound source 7 (S26).

  If the pitch of note A is not lower than the pitch of note B in the determination process of S22 (S22: No), portamento is performed so as to lower the pitch, and the current time t, portamento time T and sound The bend value PDw is calculated by substituting the height difference I into Equation 3 (S31). Next, it is determined whether or not the calculated bend value PDw is smaller than the pitch difference I (S32). If the bend value PDw is not smaller than the pitch difference I (S32: No), timer interruption is prohibited. (S33).

  When the calculated bend value PDw is smaller than the pitch difference I (S32: Yes), or when the process of S33 is completed, the bend value PDw is sent to the sound source 7 (S34). When the process of S27 or S34 is completed, this timer interrupt process is terminated and the process returns to the main process.

  As described above, when the note-on information of the note B is input, portamento is started in accordance with a predetermined portamento time T. When the note-off information of the note A is input, the portamento time T is changed so as to be shortened. By doing in this way, when the key is released earlier, the portamento time T is changed to be shorter. Therefore, if the note-off timing of the note A changes depending on the performance mode, such as when a short note is played quickly or when a long note is played slowly, the portamento time T changes accordingly, which is suitable for the performance mode. Effects can be obtained. The portamento time T can also be controlled by consciously changing the note-off timing of the note A.

  Next, another method for changing the portamento time T will be described with reference to FIG. In the first embodiment, when the note-off information of note A is input, the portamento time T is changed by setting the time interval of the timer interruption to half the time. In the embodiment, the portamento speed is changed according to the time from when the note-on information of the note B is input to when the note-off information of the note A is input. FIG. 5A is a graph showing how the portamento speed changes according to the time from when the note-on information of note B is input to when the note-off information of note A is input.

  For example, when the time from when the note-on information of note B is input to when the note-off information of note A is input is short (t4), the portamento speed is changed to three times as shown by the solid line, When the time from when the B note-on information is input to when the note-off information of the note A is input is long (t4 '), the portamento speed is doubled as shown by the alternate long and short dash line. . By doing so, the portamento time becomes shorter as the key release of the note A is made earlier, and the portamento time T can be greatly changed.

  In the third embodiment, the portamento speed is changed slowly according to the time from when the note-on information of the note B is input. When the note-off information of the note A is input, the portamento at that time The pitch changes with speed. In the method shown in FIG. 5B, the portamento speed is decreased according to the time from when the note-on information of the note B is input, and when the note-off information of the note A is input, the note at the portamento speed at that time. It is a graph which shows a mode that it changes until it reaches the pitch of B. As shown in FIG. 5B, when portamento is started at a high speed as indicated by a solid line from the time when note-on information of note B is input, and note-off information of note A is not input by time t6, As shown by the broken line, the portamento speed is slightly reduced.

  When note-off information of note A is input at time t4, the pitch changes to note B at the portamento speed indicated by the broken line. However, when note-off information of note A is not input, portamento is further added at time t7. Reduce the speed.

As another method, the portamento time T may be changed when the note-off information of the note A is input. For example, if the changed portamento time is T ′,
T ′ = T− (T−t4) / 2
Then, the portamento time T ′ thus changed is substituted into T in Equation 2 or 3, and the subsequent portamento is performed.

  The portamento control means described in the claims corresponds to the process of the flowchart shown in FIG. 4, and the speed changing means corresponds to the S8 process of the flowchart shown in FIG.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above-described embodiments, and various improvements and modifications can be easily made without departing from the spirit of the present invention. It can be guessed.

  For example, in the above embodiment, the electronic musical instrument 1 has the sound source 7 built therein, but may be connected to an external sound source via an interface such as MIDI.

  In the above embodiment, it is not described that the tone color of the tone generated by the sound source 7 is selected, but an operation element for arbitrarily selecting a tone color is provided, and the tone color selected by the operation element is a trombone. In this case, the present invention may be applied.

  In the above embodiment, the input note event is generated by playing the keyboard. However, it may be a note event formed by playing other instruments such as a guitar synthesizer.

  In the second embodiment, the portamento speed is changed according to the time from when the note-on information of the note B is input to when the note-off information of the note A is input. The off-velocity information that is the velocity of the key release may be included in the off-information, and the portamento speed may be changed according to the magnitude of the off-velocity.

It is a block diagram which shows the electric constitution of the electronic musical instrument in embodiment by this invention. It is a graph which shows typically the pitch change instruct | indicated according to an input event, (a) shows what is based on a prior art, (b) shows what is based on the 1st Embodiment of this invention, respectively. It is a flowchart which shows an event main process. It is a flowchart which shows a timer interruption process. (A) is a graph which shows typically the pitch change instruct | indicated according to the input event in 2nd Embodiment, (b) is instruct | indicated according to the input event in 3rd Embodiment. It is a graph which shows a pitch change typically.

Explanation of symbols

1 Electronic musical instrument 2 CPU
2a Timer (time measuring means)
3 ROM
3b Sine table (change curve storage means)
4 RAM
4a Temporary memory 6 MIDI interface (input means)
7 Sound source

Claims (4)

Input means for inputting note-on information for instructing the start of the generation of a musical tone of a predetermined pitch and note-off information for instructing the stop of the musical sound; In an electronic musical instrument that gives instructions according to
When the first note-on information is input by the input means and the second note-on information is input before inputting the note-off information corresponding to the first note-on information, the first note-on information is input. Portamento control means for controlling the sound source so as to change the pitch at a predetermined speed from the first pitch indicated by the information to the second pitch indicated by the second note-on information;
The speed at which the first pitch changes to the second pitch when the note-off information corresponding to the first note-on information is input after the second note-on information is input to the input means. An electronic musical instrument comprising: a speed changing unit that changes the speed so as to be faster than the predetermined speed. A timing means for measuring time between when the second note-on information is input to the input means and when the note-off information corresponding to the first note-on information is input;
2. The electronic musical instrument according to claim 1, wherein the speed changing means changes the speed according to the time measured by the time measuring means. The note-off information input to the input means has off-velocity information indicating a key release speed,
2. The electronic musical instrument according to claim 1, wherein the speed changing unit changes the speed according to off-velocity information included in the note-off information input to the input unit. A change curve storage means for storing a change curve indicating a change in pitch over time;
The portamento control means controls the pitch change by reading the change curve stored in the change curve storage means sequentially at a predetermined speed as time elapses, and the speed change means is controlled by the portamento control means. 4. The electronic musical instrument according to claim 1, wherein the change speed of the pitch is changed by changing the reading speed of the change curve stored in the curve storage means.

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