JP3728626B2 - Code discrimination device - Google Patents

Description

  The present invention relates to a technique for determining a chord designated by an operation on a plurality of different performance operators in a group of performance operators.

  In recent years, an electronic accompaniment function is standardly installed in electronic musical instruments. With this automatic accompaniment function, the user can enjoy the joy of an ensemble performance by playing the melody in time with the accompaniment sound.

  Usually, an accompaniment sound consists of a bass (rhythm) part and a chord accompaniment part, and a chord presses, for example, a plurality of keys on a keyboard (a group of performance operators) in correspondence with the constituent sound of a desired chord. Can be specified arbitrarily. Normally, for an accompaniment sound, a rhythm part is first started by operating a start button or the like, and then a chord accompaniment part is started after a chord is specified. Once the automatic accompaniment is started, the chord can be changed midway.

  The chord discriminating device mounted on the electronic musical instrument as described above discriminates the chord from the key pressed on the keyboard. Therefore, in the automatic accompaniment, the accompaniment sound is generated with the chord determined by the chord discriminating device.

  In the automatic accompaniment function, so far, many split specifications have been adopted in which the keyboard is divided into an accompaniment key range and a melody key range, and a different function is assigned to each key range. The accompaniment key range is for designating chords of accompaniment sounds, and the melody key range is for designating musical sounds to be generated as melody. In this split specification, a chord is generally determined from a combination of keys currently pressed in the accompaniment key range.

  Recently, an electronic musical instrument with an automatic accompaniment specification has been commercialized, in which all keys are assigned as designated accompaniment sounds, and all key accompaniment ranges are generated with the pitch of the key pressed. Has been. In such a specification, a specified code must be determined from all keys pressed on the keyboard. For this reason, it is determined that a plurality of predetermined keys pressed from the lower pitch are key presses for specifying a chord, and the chord is determined from a combination of these keys. For example, if the chord is specified by three different keys, the key is pressed from the lowest pitch, and if the chord is specified by four different keys, the key is pressed from the lower pitch. There are 4 keys.

  In the all-key accompaniment area specification, the entire keyboard can be used for chord designation in this way, so even if you intend to play as a melody, multiple keys that specify chords are pressed at the same time, which is not intended by the user. There was a problem that the code was set. Due to this problem, the performance of melodies that take advantage of the pitch, tone length, strength, etc. was restricted. As a matter of course, the above-mentioned problem also occurs in the split specification in which a musical tone is generated along with a chord designation by pressing a key in the accompaniment key range.

  An object of the present invention is to discriminate only chords that are consciously specified by the user and to obtain chord progressions in accordance with the user's intention.

The chord discriminating apparatus of the present invention includes a keyboard having keys to which pitches of different musical tones are respectively assigned, and a key pressing state detecting means for detecting a key pressing state of the keyboard by scanning the keyboard at a predetermined period; A key depression detecting unit for detecting presence / absence of a new key depression from a scan result by the key depression information detecting unit, a damper pedal, a determination unit for determining whether or not the damper pedal is operated, and the key depression detecting unit. When a new key is detected and the determination means detects that the damper pedal is not operated, the sound corresponding to the key detected by the key pressing state detection means as being in the key pressing state Code discriminating means for discriminating the code based on the height.

As described above, according to the present invention , since the chord discrimination is stopped when the input means for controlling the tone generation period of the musical tone such as the damper is operated, the chord discrimination during the period when the chord designation is not conscious is avoided. The user can obtain a chord progression as intended.

  Since the above-described inventions pay attention to different points from each other, a greater effect can be obtained by combining them.

The chord discriminating apparatus of the present invention discriminates chords from the performance operator being operated in accordance with the operating state of an input means such as a damper that controls the tone generation period of a musical sound .

  A chord is a sound that is synthesized when two or more sounds with different heights resonate at the same time, and a triad consisting of three sounds with a pitch difference of 3 degrees is fundamental and typical. . Further, as described above, the user specifies a chord by operating (at least intending to operate) a plurality of performance operators corresponding to the constituent sounds of the chord simultaneously. Therefore, by checking the pitch difference between the performance controls operated as described above, and determining the chord according to the result, the performance control operator corresponding to the chord designation is unaware. The chord is not discriminated even in the state of being operated, and undesired chord progression is avoided.

  When the damper is being operated, the musical tone being sounded is muted as soon as the operation of the performance operator is completed, so it is not normally considered to specify a chord together with the operation of the damper. As is clear from this, it is possible to avoid discriminating a code that is not intended by the user.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an electronic musical instrument 100 equipped with a chord discrimination device according to the first embodiment.

  In FIG. 1, a performance information input device 101 is operated by a user to generate a desired musical tone, and includes a keyboard 101a having a touch response function, a right (damper) pedal, and a left (weak sound) pedal. It consists of various pedals 101b. The touch response function is roughly classified into an initial touch response for detecting the strength of playing the key and an after touch response for detecting the strength of pressing the key after the key is pressed. In the first embodiment, an initial touch response function is provided as a touch response function. The strength of playing the key is determined, for example, by measuring the time from when the key is pressed to when the key is pressed, and based on the measured time. Hereinafter, the strength at the time of key depression is referred to as a key depression speed.

  The control unit 102 scans the performance information input device 101, and particularly detects operation states of various switches on a console (not shown) by scanning, and executes overall control of the musical instrument 100 according to the switch operation states. To do. The musical sound generating unit 103 inputs a signal after the control unit 102 scans the performance information input device 101 as performance information, and generates a musical sound according to the performance information. Therefore, when the user performs any operation on the performance information input device 101, the musical sound generating unit 103 generates a musical sound corresponding to the operation content and key pressing timing as a melody.

  The performance information indicating the current operation state output from the performance information input device 101 is input to the performance information storage unit 104. The performance information storage unit 104 stores performance information output from the performance information input device 101 in accordance with a control signal from the control unit 102.

  The key pressing timing discriminating unit 105 reads out the performance information stored in the performance information storage unit 104 to determine the key pressing speed (strength when the key is pressed) of the operated key, and for each of the calculated keys. By comparing the key pressing speed with a predetermined speed (set speed), it is determined (detected) whether the operation for each key belongs to a strong beat or a weak beat. This determination result is sent to the pitch comparison unit 108, which will be described later, as timing information indicating the timing at which chord determination should be performed.

  The key pressing speed is obtained once when a key operation is detected. When it is determined that it belongs to a strong beat, timing information indicating that fact is sent from the key pressing timing determination unit 105 to the pitch comparison unit 108 for a predetermined period. As a result, when a key that is in a state where an operation of a key belonging to a strong beat has not been detected is strongly operated, a period for performing the chord determination is reached after the predetermined period elapses after the key is operated.

The chord detection unit 106 reads out the performance information stored in the performance information storage unit 104, and determines the chord type from the pitch assigned to the currently pressed key. The chord determination unit 107 determines whether or not to hold the chord type (code data) determined by the chord detection unit 106 according to the control signal input from the pitch comparison unit 108 . The code type represented by the code data held in the code determination unit 107 is a code that is currently determined.

The pitch comparison unit 108 will be described in detail with reference to the flowchart of the overall processing of FIG. 2 described later . Timing information (presence / absence of key depression belonging to strong beats) input from the key pressing timing determination unit 105, chord detection unit Based on the pitch data of the currently pressed key input from 106 and the pitch data stored in the latest key-pressed data storage buffer 109, whether or not a chord that is not intended by the user is specified The control signal is output to the code detection unit 106 and the code determination unit 107 according to the determination result. After outputting this control signal, the pitch comparison unit 108 newly stores the pitch data input from the chord detection unit 106 in the latest key pressing data storage buffer 109. As a result, the latest key pressing data storage buffer 109 stores and updates the latest result when the performance information input device 101 is scanned whenever it is scanned.

The code detection unit 106 determines a code type from the currently pressed key, and outputs code data representing the determined code type to the code determination unit 107 in accordance with the control signal. On the other hand, the chord determination unit 107 determines that the chord detection unit 106 determines that the chord comparison unit 108 has not designated a chord that is not intended by the user according to the control signal input from the pitch comparison unit 108. Stores the output code data.

  The automatic accompaniment generator 110 generates an accompaniment sound using the chord data stored in the chord determiner 107. At this time, the accompaniment sound is generated with contents (rhythm, tone color, tempo, etc.) designated by operating a switch provided on a console (not shown).

  The above is the configuration and schematic operation of the electronic musical instrument 100. Next, the overall operation of the control unit 102 will be described with reference to the flowchart of the overall processing shown in FIG. When the power is turned on, the control unit 102 first performs initialization (initialization) of the contents of a RAM (not shown) provided therein (step 201), and then scans the performance information input device 101. Various event processes such as a sound generation event process (details will be described later) for generating a melody and an accompaniment sound are executed according to the result of the process and the scan process (step 202).

  When the various event processes in step 202 are completed, the switch group on the console is scanned, and the console switch process for setting / switching the mode according to the scan result, in particular, displaying a display unit (not shown), etc. Execute (step 203). After the console switch process is completed, other control processes such as turning off the power if no operation is performed within a predetermined time are executed (step 204), and the process returns to step 202.

  By repeating the processing of steps 202 to 204, the electronic musical instrument 100 performs generation of a melody and accompaniment sound, mode setting, and switching in accordance with a user operation.

  Next, the various event processing in step 202 will be described in detail. As described above, the processing content of this step 202 is roughly divided into a process of scanning the performance information input apparatus 101 and a sounding event process corresponding to the scan, and each process is executed in this order. Since the scan uses a generally well-known method, only the sound event processing will be described here.

  FIG. 3 is a flowchart of the sound generation event process according to the first embodiment. This sounding event process proceeds by the control unit 102 controlling the operations performed by each unit such as the chord detection unit 106 and the pitch comparison unit 108.

  In the sound event processing, first, it is determined whether or not there is an operation event for the performance information input device 101, that is, the keyboard 101a and the various pedals 101b (step 301). The presence / absence of this operation event is determined from the content stored in the performance information storage unit 104. If it is determined that there is no performance operation event (step 301, NO), the series of processes ends here. If it is determined that there is a performance operation event (step 301, YES), the process proceeds to step 302.

  In step 302, it is determined whether or not there is a key pressing event. If it is determined that there is no key depression event (step 302, NO), other event processing such as setting the volume and length of the sound to be generated in accordance with the operation of the various pedals 101b is executed (step 303). After ending, a series of processing ends.

  If it is determined in step 302 that there is a key-pressing event, a sounding process for generating a tone with the pitch assigned to the key that detected the key-pressing event is executed (step 304), and then the process proceeds to step 305. To do. The sound generation process in step 304 is realized by causing the music sound generation unit 103 to generate a sound according to the scan result output from the performance information input device 101.

  In step 305, it is determined whether or not the accompaniment mode is currently set. If it is determined that the accompaniment mode is not set (step 305, NO), the process ends here. If it is determined that the accompaniment mode is set (step 305, YES), the process of step 306 is performed. Transition. Here, the electronic musical instrument 100 has an all-key accompaniment area specification in which accompaniment sound chords can be designated by all keys on the keyboard 101a. For this reason, the chord is discriminated by referring to the key pressed from the lowest pitch by the number of constituent sounds.

  In step 306, it is determined whether or not the current code is fixed. If it is determined that the code has not been determined (step 306, NO), a process for determining the code type from the currently pressed key is executed (step 307). This chord discrimination process is realized by causing the chord detection unit 106 to discriminate chords from the performance information stored in the performance information storage unit 104. If a new chord cannot be discriminated from the performance information, the chord decision unit 107 continues to hold the chord data that has been held so far without being changed from the chord that has been decided so far.

  When the code determination is completed, it is next determined whether or not the code is confirmed (step 308). If it is determined that the chord is confirmed (step 308, YES), a chord sound generation process is executed for causing the automatic accompaniment generator 110 to sound the accompaniment sound with the confirmed chord (step 309). When the chord sound generation process ends, the pitch data of the latest key press is updated (step 310), and the series of processes ends.

  The chord sound generation process in step 309 is realized by outputting a control signal that causes the automatic accompaniment generator 110 to sound the accompaniment sound using the chord data held in the chord determination unit 109. Also, in the process of step 310 for updating the pitch data of the latest key press, the pitch data of the latest key pressed at the current time received from the chord detection unit 106 is sent to the pitch comparison unit 108. This is realized by writing to the key data storage buffer 109.

On the other hand, if it is determined in step 306 that the current chord has been confirmed, then in step 311, whether or not the key of the constituent sound of the chord that has been confirmed is depressed, that is, the depressing key that has confirmed the chord. Determine whether the key continues. In this determination processing, the pitch comparison unit 108 obtains the constituent sound from the chord data held in the chord determination unit 107 by the previous processing loop , and the obtained constituent sound and the pitch data input from the chord detection unit 106 This is realized by comparing If it is determined that the key of the chord component sound is depressed (step 311: YES), the process proceeds to step 309, and conversely, if the key of the chord component sound is not depressed (step 311). , NO), the process proceeds to step 312.

In step 312, it is determined whether or not the performance key press timing, which is the detection timing of the key press event detected in steps 301 and 302 , is a weak beat. If it is determined that the key pressing timing is not a weak beat (NO in step 312), the process proceeds to the chord determination process in step 307. To do.

  As described above, whether or not the pressed key strength is a weak beat is determined by the key pressing timing determination unit 105 comparing the set speed with the key pressing speed of the key whose operation is detected. For example, MIDI (Musical Instrument Digital Interface) corresponds to a velocity value (having an accuracy of 1 to 127 steps) that is a parameter that conveys the strength when a key is played. Is the value to be The pitch comparison unit 108 determines that the key pressing timing is a weak beat if timing information indicating that a key pressing belonging to a strong beat has been detected is not sent from the key pressing timing determination unit 105, and if not, The key timing is determined to be a strong beat.

  Since chord changes and the like are performed in synchronization with the progress of the music, it is normal that the key depression intended for chord designation becomes strong. In general, an accompaniment sound is pronounced at a specified volume, so there is no particular reason why it is necessary to play the key weakly in order to specify a chord. From these facts, when the key pressing timing is a weak beat, it can be said that even if a plurality of keys specifying a chord are pressed, the user is not likely to specify the chord. In this case, since the code determination is stopped, a code change unintended by the user can be avoided.

  FIGS. 4A to 4C are diagrams showing examples of key presses of strong beats and weak beats in a performance. As shown in FIG. 4, a music piece is often played so that the beginning of a measure is a strong beat and the other is a weak beat, as shown in FIG. 4. A measure is a unit of rhythm in the performance, which is adapted to the specified time signature of the music. For this reason, a chord change is normally performed when the start timing of a measure, that is, the key pressing timing (key pressing speed) is a strong beat, and if the key pressing speed is a weak beat, the user intends to specify a chord. Often not.

  In the first embodiment, a code change unintended by the user is avoided by determining the timing for performing the code determination from the strength when the user actually presses the key. However, as shown in FIGS. 4A to 4C, the strong key and the weak key are often pressed regularly. Therefore, even if the timing at which a certain musical piece is played (key-pressed) with a strong beat is predetermined as the timing for determining the chord, it is possible to avoid a chord change that is not intended by the user.

  An electronic musical instrument equipped with an automatic accompaniment function has performance data for performing automatic accompaniment, and this performance data includes time data for managing individual musical sounds to be generated. For this reason, it can be known whether the current performance position is performance data, including whether or not it is the beginning of a measure, and its realization is easy.

  In the first embodiment, the chord is discriminated by detecting at least one key pressing speed belonging to a strong beat, but the chord is specified by pressing a plurality of keys. From, for example, when the average key pressing speed when those keys are played is slower (weaker) than the set speed, or when there is even one key played slower (weaker) than the set speed The key pressing timing may be determined as a weak beat (that is, the chord determination is stopped). In addition to the key pressing speed, that is, the strength when the key is played, the chord determination may be performed by including the key pressing timing such as whether or not the key is at the head of the measure.

  When the average strength is adopted, for example, first and second setting speeds (first setting speed> second setting speed) are prepared, and the average strength is higher than the first setting speed. Alternatively, code determination may be performed when the strength of each key is faster than the second set speed. For example, when one key is pressed very strongly, an unintended code may be determined at one set speed. However, by providing two set speeds, such a problem can be reliably avoided.

  Furthermore, for example, when it is assumed that the chord is designated by pressing the three keys, the weakly played keys are ignored, and the chord is discriminated by extracting the three strongly played keys from the lowest pitch. Anyway. This can be expected to make it easier for a user with a low skill level to specify a code.

  In step 313, the pitch of the newly pressed key is adjacent to the pitch of the key that was previously pressed, that is, the key that was released just before that key press within a range of 2 degrees. Judge whether or not. In this determination process, the pitch comparison unit 108 is referred to the pitch data input from the chord detection unit 106 and the pitch data stored in the latest key pressing data storage buffer 109, and the corresponding two pitches. This process is performed by specifying data. For example, when one key is newly pressed from the last scanned state, the number of pitch data output from the chord detection unit 106 is the number of pitch data stored in the latest key press data storage buffer 109. Since there is only one more than the number, the newly pressed key is specified by comparing these pitch data. If there is no new key press from the previous scan, all the pitch data output from the chord detector 106 are stored in the latest key press data storage buffer 109. In this case, it is determined that it is not necessary to perform code determination, and the process proceeds from step 313 to step 309.

If it is determined in step 313 that they are adjacent to each other in a range of 2 degrees (YES), the process proceeds to step 309 and the accompaniment sound is generated by the chord held in the chord determination unit 107. On the other hand, if it is determined that they are not adjacent in the range of 2 degrees (NO), the process proceeds to step 314.

  In step 314, it is determined whether the pitch of the key pressed this time is adjacent to the pitch of another key already pressed within a range of 2 degrees. If these pitch differences are within the range of 2 degrees, the determination is YES, and the process proceeds to step 309. If the pitch difference is outside the range of 2 degrees, the determination is no and the process proceeds to the code determination process in step 307. The determination process in step 314 is also performed by causing the pitch comparison unit 108 to refer to the pitch data input from the chord detection unit 106 and the pitch data stored in the latest key pressing data storage buffer 109. It is processing.

FIGS. 5A and 5B are diagrams showing examples of a pitch difference of 2 degrees and a length of 2 degrees. FIG. 5A shows a pitch difference of 2 degrees and FIG. 5B shows a pitch difference of 2 degrees.
The basic chord consists of three sounds with a pitch of 3 degrees, and the sound of the chord prepared for the electronic musical instrument 100 (automatic accompaniment generator 110) to sound as an accompaniment sound has a pitch difference of 3 degrees or more. There is. In addition, as an operation at the time of code designation, a plurality of keys are not sequentially depressed, and at least a plurality of keys are depressed within a narrow time even when the key depression is detected by scanning. It is normal. From these facts, if the pitch difference between the newly pressed key and the already pressed key is 3 degrees or less, it can be said that the user is not likely to specify the chord. . In this case, as described above, it is determined that there is no situation where code determination is performed in step 313 or 314. For this reason, chord discrimination not desired by the user is avoided, and chord progression in accordance with the user's intention is obtained.

  In step 313, only the pitch difference between the two pitch data whose timings are pressed is compared. For this reason, the risk of discriminating a chord that the user does not want is higher than that in step 314 that compares with other pitch data, but there is an advantage that the processing can be performed at high speed. This means that step 312 is included. However, by selecting a plurality of performance states as criteria for determining whether or not to perform chord discrimination and combining them, the chord as intended by the user can be obtained. Changes can be made, and the time required for the processing can be shortened as a whole.

  In the above-described sounding event process, steps 312 to 314 focus on the newly pressed key, and the newly pressed key is pressed as a melody or is pressed with the code designation in mind. This is a process of analyzing whether Basically, the relationship between other pitch data already pressed is not considered, and new chord functions are analyzed as needed to determine whether or not to perform chord discrimination. Although the processing contents in this step are simple, a high effect can be obtained in avoiding unintended code designation.

In the first embodiment, conditions for performing chord discrimination such as a pitch difference and strength at the time of key depression are fixed, but may be set by the user. In this case, it is possible to limit the chord types that can be designated from among the chord types prepared by arbitrarily setting at least one pitch difference for which chord discrimination is not performed.

  Next, a second embodiment will be described. Similar to the first embodiment, the second embodiment is applied to the electronic musical instrument 100, and the basic configuration thereof is the same as that of the first embodiment. For this reason, only different parts from the first embodiment will be described using the same reference numerals.

  FIG. 6 is a flowchart of the sound generation event process according to the second embodiment. With reference to FIG. 6, the sounding event process will be described. In the second embodiment, first, it is determined whether or not there is an operation event for the performance information input device 101, that is, the keyboard 101a and the various pedals 101b (step 601). The presence / absence of this operation event is determined from the content stored in the performance information storage unit 104. If it is determined that there is no performance operation event (step 601: NO), the series of processing ends here. Conversely, if it is determined that there is a performance operation event (step 601, YES), the processing proceeds to step 602.

  In step 602, it is determined whether there is a key pressing event. If it is determined that there is no key depression event (step 602, NO), other event processing such as setting the volume and length of the sound to be generated according to the operation of the various pedals 101b is executed (step 603). After ending, a series of processing ends.

  If it is determined in step 602 that there is a key depression event, a sound generation process for generating a musical tone with the pitch assigned to the key that detected the key depression event is executed (step 604), and then the process proceeds to step 605. To do. The sound generation process in step 604 is realized by causing the music sound generation unit 103 to generate a sound according to the scan result output from the performance information input device 101.

  In step 605, it is determined whether or not the accompaniment mode is currently set. If it is determined that the accompaniment mode is not set (step 605, NO), a series of processing ends here, and if it is determined that the accompaniment mode (all key accompaniment area specifications) is set (step 605, YES) ), The process proceeds to step 606.

  In step 606, it is determined whether or not the current code is fixed. If it is determined that the code has not been determined (step 606, NO), a process of determining the code type from the currently pressed key is executed (step 607). This chord discrimination process is realized by causing the chord detection unit 106 to discriminate chords from the performance information stored in the performance information storage unit 104. If a new chord cannot be discriminated from the performance information, the chord decision unit 107 continues to hold the chord data that has been held so far without being changed from the chord that has been decided so far.

  When the determination of the code is completed, it is next determined whether or not the code is confirmed (step 608). If it is determined that the chord is confirmed (step 608, YES), a chord sound generation process is executed for causing the automatic accompaniment generator 110 to sound the accompaniment sound with the confirmed chord (step 609). When the chord sound generation process ends, the pitch data of the latest key press is updated (step 610), and the series of processes ends.

  The chord sound generation process in step 609 is realized by causing the automatic accompaniment generator 110 to sound the accompaniment sound using the chord data held in the chord determination unit 109. In addition, in the process of step 610 for updating the pitch data of the latest key press, the pitch data of the latest key pressed at the present time received from the chord detection unit 106 is sent to the pitch comparison unit 108. This is realized by writing to the key data storage buffer 109.

  On the other hand, if it is determined in step 606 that the current chord has been confirmed, then in step 611, whether or not the key of the constituent sound of the chord that has been confirmed is depressed, that is, the depressing key that has confirmed the chord. Determine whether the key continues. In this determination process, the pitch comparison unit 108 obtains the constituent sound from the chord data held in the chord determination unit 107 and compares the obtained constituent sound with the pitch data input from the chord detection unit 106. This is realized. If it is determined that the key of the chord component sound is depressed (step 611, YES), the process proceeds to step 609, and conversely, if the key of the chord component sound is not depressed (step 611). , NO), the process proceeds to step 612.

In step 612, it is determined whether or not the damper pedal is turned on. When the damper pedal is judged not to be turned on (step 612, NO), the process proceeds to the chord decision process of step 607, if determined to be turned in the opposite (step 612, YES), the process proceeds to step 609 .

  In the second embodiment, the code is discriminated according to the operation state of the damper pedal. However, the second embodiment may be incorporated into the first embodiment. In this case, the process in step 612 in FIG. 6 may be inserted between the processes in steps 311 and 312 in FIG.

  In the first and second embodiments, the case of the all-key accompaniment area specification is described as an example, but the specification of the automatic accompaniment function is not limited to this. Since an unintended chord designation due to an erroneous key press can be avoided, the present invention can also be applied to a split-type electronic musical instrument that divides functions into an accompaniment key range and a melody key range. In addition, the present invention is not limited only to accompaniment sound chord discrimination, and the present invention can be easily applied if the electronic musical instrument has a function of generating a certain tone according to a chord designated by the user. In addition to the effects described above, the effects obtained from the present invention include chord discrimination according to the performance state such as the timing at which each key specifying a chord is pressed and the strength of each key. The effect that the contents can be checked can also be expected.

It is a block diagram which shows the structure of the electronic musical instrument to which the 1st Example (and 2nd Example) was applied. It is a flowchart of the whole process. It is a flowchart of the sound generation event process by a 1st Example. It is a figure which shows the key pressing example of a strong beat and a weak beat. It is a figure which shows the key pressing example of a strong beat and a weak beat. It is a flowchart of the sound generation event process by the 2nd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Electronic musical instrument 101 Performance information input device 101a Keyboard 101b Various pedals 102 Control part 104 Performance information storage part 105 Key press timing discrimination part 106 Code detection part 107 Code determination part 108 Pitch comparison part 109 Latest key press data storage buffer

Claims (1)

A keyboard with keys each assigned a different musical pitch;
A key pressing state detecting means for detecting a key pressing state of the keyboard by scanning the keyboard at a predetermined period;
A key press detecting means for detecting the presence or absence of a new key press from a scan result by the key press information detecting means;
A damper pedal,
Determination means for determining whether or not the damper pedal is operated;
When a new key depression is detected by the key depression detection means and when it is detected by the determination means that the damper pedal is not operated, the key depression state detection means detects that the key is depressed. Chord discriminating means for discriminating a chord based on the pitch corresponding to the key,
A code discriminating apparatus comprising:

Images