JPH06230782A - Electronic musical instrument - Google Patents

Abstract

PURPOSE:To provide the electronic musical instrument for enabling natural chord advancement by generating chord sounds at timing intended by a player concerning the electronic musical instrument for performing play while automatically generating accompanying sounds by detecting chords related to keying. CONSTITUTION:This electronic musical instrument is provided with a keyboard device 16 equipped with the two contacts of a first contact to be turned on first and a second contact to be turned on later at the time of pressing/keys to be turned on/off with different pressing depths for each key so as to output key information showing key positions and the ON or OFF information of the first contact at least, chord detecting means 10 for detecting chords by starting chord detection according to the key information when the ON information of the first contact is received from the keyboard device 16, and music signal generating means 18 for generating music signals related to the chords detected by the chord detecting means 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical instrument capable of detecting a chord associated with a key depression and automatically producing an accompaniment sound.

[0002]

2. Description of the Related Art In recent years, electronic musical instruments having an automatic accompaniment function have been developed and put into practical use. As an automatic accompaniment function in such an electronic musical instrument, a musician automatically generates an accompaniment sound in accordance with a predetermined chord progression when a performer gives an instruction to start automatic accompaniment, or the performer sequentially presses in accordance with a desired chord progression. It is known that a key is used to detect a chord according to the key depression pattern, and an accompaniment sound is automatically generated based on the detected chord.

In the former case, there is an inconvenience that the performer cannot freely change the chord progression of the accompaniment sound, so in recent years, the latter automatic accompaniment function allows the performer to arbitrarily decide the chord progression. There are many electronic musical instruments that adopt the above, or electronic musical instruments that use the former and latter functions together.

In the latter electronic musical instrument, a part of the keyboard device is generally set as a chord detecting key range, and the rest is set as a normal playing key range. In this case, the key in the chord detection key range is different from the function of the key in the normal performance key range, and is not sounded for a depressed key, and is used only as a chord designating means. In other words, the key in the code detection key area only acts as a code designating switch.

In such an electronic musical instrument, a player depresses a key in the chord detection key range to detect a chord in accordance with a combination of keys (depression pattern) related to depressing, and a musical tone constituting the detected chord. Is generated. On the other hand, when pressing a key in the normal performance key range,
A normal tone corresponding to the key press is generated.

With the above-mentioned structure, the player can take a performance form of playing a melody while generating a chord corresponding to a desired chord progression as an accompaniment sound. At this time, when the player designates a chord, the chord can be designated as if pressing the chord in a normal performance, which is convenient for a player who is accustomed to keyboard operation.

By the way, recent keyboard devices detect and output a key number indicating the position of a depressed key, and also detect and output the strength (speed) of a keystroke. It is generally equipped with.

In the keyboard device with the touch detection device, each key is provided with two key switches that are turned on / off at different pressing depths, and the first key switch (first contact) is activated by pressing the key. The time from when the switch is turned on until the second key switch (second contact) is turned on is measured to generate initial touch data indicating the strength of keystroke. Further, when the second contact is turned on, it is recognized that a key has been pressed, and data indicating a key pressing position, that is, a key number is generated.

Therefore, in the electronic musical instrument having the above-mentioned keyboard device with the touch detection device, the key number and the initial touch data are generated and sent to the processing device after the second contact of each key is turned on. Then, in the processing device, sound generation processing is performed based on the received key number and initial touch data.

In the electronic musical instrument constructed as described above, depending on the performance of the processing device, it takes a long time from the time when the key is pressed until the sound is emitted, and there is a problem that the timing of the key press and the sound generation are deviated. It was happening.

In order to solve this problem, for example, as disclosed in Japanese Patent Laid-Open No. 4-119396, immediately after the first contact is detected to be turned on, the pitch information of the relevant key is sent to the control section. An electronic musical instrument has been developed in which a sound generation process is started by transmitting the second contact to obtain initial touch data and then the remaining sound generation process is performed to emit a musical tone.

[0012]

On the other hand, in the electronic musical instrument with an automatic accompaniment function, which detects a chord in response to a key depression in the chord detecting key range and automatically generates an accompaniment sound, the above-mentioned Japanese Patent Laid-Open No. There was a problem similar to the problem pointed out in the 4-119396 gazette.

That is, the above-mentioned Japanese Patent Laid-Open No. 4-119396 points out the problem that there is a time lag between the keystroke and the generation of a musical tone based on the keystroke. There is a problem that it takes a long time from when a key in the key range is pressed until the chord is detected and the sound is generated, and there is a large time difference between the key depression and the sound of the chord.

In particular, in the chord detection process, a large number of comparison processes are performed because it is necessary to check the coincidence with the chord detection data prepared in advance. There was a problem that I could not do it.

In the automatic accompaniment, there is a problem that the timing of pressing the keys and the timing of sounding are deviated from each other.
The invention disclosed in Japanese Patent No. 396, that is, when it is detected that the first contact is turned on, the pitch information of the corresponding key is transmitted to the control unit to start the sound generation processing, and the second contact is turned on to initialize. It has not been solved by the invention that the tone generation is performed by performing the remaining tone generation processing after the touch data is obtained.

The present invention has been made in view of such circumstances, and shortens the time from the key being pressed until the chord is detected and each musical tone constituting the chord is shortened, so that the timing intended by the performer is shortened. It is an object of the present invention to provide an electronic musical instrument in which a chord sound is generated and natural chord progression is possible.

[0017]

In order to achieve the above object, the invention according to claim 1 has two contact points which are turned on or off at different pressing depths and which are turned on first when pressing. A keyboard device that includes one contact and a second contact that is turned on later for each key, and outputs at least key information indicating a key position and on / off information of the first contact, and a keyboard device that outputs the first contact from the keyboard device. When the ON information is received, a chord detecting means for starting chord detection based on the key information to detect the chord and a musical tone signal generating means for generating a musical tone signal related to the chord detected by the chord detecting means are provided. It is characterized by having.

For the same purpose as described above, the invention according to claim 2 is two contacts which are turned on or off at different pressing depths, the first contact being first turned on when pressed and the second contact being turned on later. And a second contact for each key, which outputs at least key information indicating a key position and ON or OFF information of the first contact, and ON information of the first contact received from the keyboard device. At this time, when the key information indicates a key position within a predetermined predetermined key range, a code detecting means for starting code detection based on the key information to detect a code, and a code detecting means for detecting the code. Musical tone signal generating means for generating a musical tone signal related to the generated code.

[0019]

According to the present invention, each key of the keyboard device having the first contact and the second contact which is turned on or off according to the depth of pressing is
This is done by paying attention to the fact that the first contact is turned on prior to the second contact when a key is pressed, and that the same keyboard device is also used for chord designation in the case of automatic accompaniment.

That is, in the invention described in claim 1,
When the ON information of the first contact and the key information from the keyboard device is received, the chord detection process is started based on the key information to detect the chord, and a musical tone signal which is an accompaniment sound is generated according to the detected chord. I am trying to do it.

As a result, the chord detection process is completed at an earlier time than in the case where the chord detection process is started after the second contact is turned on as in the conventional case. The deviation until it is done becomes small. Therefore, the chord sound can be generated at the timing intended by the performer, so that a natural chord progression is possible.

According to the second aspect of the present invention, when the ON information of the first contact and the key information are received from the keyboard device, and the received key information indicates a key within a predetermined predetermined key range. The chord detection process is started based on the key information, chord detection is performed, and a musical tone signal that becomes an accompaniment sound is generated after the second contact is turned on according to the detected chord.

As a result, the entire key range of the keyboard device can be divided into a predetermined key range (key range for chord detection) and another key range (key range for normal performance), and the chord When a key within the detection key range is pressed, the above-mentioned claim 1
Similar to the invention described in (1), the chord sound is generated at the timing intended by the performer, which enables natural chord progression. On the other hand, when a key within the key range for normal performance is pressed, for example, the normal sounding based on the key number and the initial touch data is performed after the second contact is turned on as in the conventional case.

Accordingly, there is a performance mode in which, for example, by pressing a key in the chord detection key range to generate an accompaniment sound at a timing intended by the performer, a key in the normal performance key range is pressed to play a melody. This makes it possible to provide electronic musical instruments with excellent operability.

[0025]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an embodiment of an electronic musical instrument according to the present invention.

The electronic musical instrument includes a central processing unit (hereinafter referred to as "CPU") 10, a read-only memory (hereinafter referred to as "ROM") 11, and a random access memory (hereinafter referred to as "RAM"), which are main parts of the electronic musical instrument. 12, the panel scan circuit 13, the keyboard scan circuit 15, and the sound source 18,
The system buses 20 are connected to each other. The system bus 20 is composed of, for example, an address bus, a data bus, a control signal line, and the like.

The CPU 10 corresponds to a chord detecting means, and controls each part of the electronic musical instrument according to a control program stored in the ROM 11.

For example, the CPU 10 fetches tone color data from the operation panel 14 via the panel scan circuit 13, and fetches key numbers, initial touch data, etc. from the keyboard device 16 via the keyboard scan circuit 15, and based on these. By reading the tone color parameters from the ROM 11 and sending them to the tone generator 18, a process for generating a predetermined musical tone is performed. The CPU 10 also performs chord detection processing, automatic accompaniment processing, and the like related to the features of the present invention.

A MIDI interface circuit 17 is connected to the CPU 10. The MIDI interface circuit 17 is a MIDI interface circuit between the electronic musical instrument and an external device.
It controls the passing of data. The external device may be, for example, a personal computer or a sequencer that processes MIDI data.

In the ROM 11, as described above, the CPU
In addition to storing 10 control programs, various fixed data used by the CPU 10 are stored. Also, this RO
M11 also stores automatic accompaniment data for performing automatic accompaniment, tone color parameters for generating a tone of a predetermined tone color, and the like.

The automatic accompaniment data is composed of, for example, data for controlling sounding or mute, data for controlling tone color, and the like. The data for controlling sounding or muting includes information such as a step time that defines sounding timing, a key number that specifies the pitch, initial touch data (velocity) that indicates the strength of keystroke, and a gate time that specifies the length of sounding. I'm out. Further, the data for controlling the timbre includes information such as a step time defining the timbre switching timing, a timbre status and a timbre number indicating the kind of the timbre.

A plurality of types of tone color parameters are provided corresponding to tone colors and tone ranges, and each tone color parameter is composed of, for example, waveform address, frequency data, envelope data, filter coefficient and the like.

The RAM 12 temporarily stores various data used by the CPU 10 for processing, and various registers, counters, flags and the like for controlling the electronic musical instrument are defined. The RAM 12 also stores code data that is code-detected and is directly related to the features of the present invention.

The automatic accompaniment data and tone color parameters may be stored in the RAM 12 instead of the ROM 11. In this case, system bus 2
For example, a floppy disk device is connected to 0, and
The automatic accompaniment data and the tone color parameters are stored in a floppy disk, and the automatic accompaniment data and the tone color parameters are stored in the RAM 1 from the floppy disk mounted in the floppy disk device when the electronic musical instrument is initialized.
It may be configured so that it is loaded to 2.

Although not shown in detail, the operation panel 14 is provided with various switches and a display for controlling the electronic musical instrument. The switches include, for example, a tone color selection switch, a rhythm selection switch, a volume switch, a sound effect switch, etc., in addition to the automatic accompaniment switch directly related to the features of the present invention.

The automatic accompaniment switch is a switch for switching the electronic musical instrument to the automatic accompaniment mode or the normal performance mode. The automatic accompaniment switch, for example,
It is realized as a toggle switch that alternately switches the electronic musical instrument from the automatic accompaniment mode to the normal performance mode or from the normal performance mode to the automatic accompaniment mode each time the button is pressed.

Here, the automatic performance mode means the keyboard device 16
In this mode, a part of the key range is assigned for chord detection, and the rest is assigned as a normal pitch instruction key. In this case, no sound is generated for the depressed keys in the chord detection key area, and the event information generated by the depressed keys is used for chord detection. The normal performance mode is
This is a mode in which the entire key range of the keyboard device 16 is used as a pitch indicating key.

The timbre selection switch is used to select one timbre from a plurality of timbres prepared by the electronic musical instrument, and the rhythm selection switch similarly selects one rhythm from a plurality of rhythms. Used to
The volume switch is used to control the volume of the musical sound to be produced, and the sound effect switch is used to specify the type of sound effect.

The display provided on the operation panel 14 displays various messages, information indicating the state of the electronic musical instrument, and the like. This display is composed of a character display using an LCD, for example.

The operation panel 14 is connected to the panel scan circuit 13.

The panel scan circuit 13 is the operation panel 1
It controls data transmission and reception between the CPU 4 and the CPU 10. That is, the panel scan circuit 13 sends a scan signal to the operation panel 14. In response to this scan signal, the operation panel 14 returns a signal indicating the on / off state of the switch to the panel scan circuit 13. The panel scan circuit 13 receives a signal indicating the on / off state of the switch, which is received from the operation panel 14, from the system bus 20.
To the CPU 10 via.

The panel scan circuit 13 is a CPU
The display data sent from 10 via the system bus 20 is sent to the operation panel 14. As a result, predetermined data is displayed on the display provided on the operation panel 14.

The keyboard device 16 has a plurality of keys for designating a pitch or for designating a chord. When the electronic musical instrument is set to the automatic accompaniment mode, as described above, a part of the keyboard device 16 (for example, half on the low frequency range side) is used for chord detection, and the rest (for example, half on the high frequency range side) is used. Used for normal pitch indication.

As the keyboard device 16, for example, a two-contact type keyboard device is used. That is, each key of the keyboard device 16 has two key switches which are operated by a key pressing operation or a key releasing operation, and are turned on / off at different pressing depths. In this embodiment, the key switch that is first turned on by pressing the key is the first contact S1, and the key switch that is turned on later is the second contact S2.

The keyboard device 16 includes a keyboard scan circuit 1
5 connected to turn on / off the first contact S1 and the second contact S2.
Data indicating the off state is sent to the keyboard scan circuit 15.

The keyboard scanning circuit 15 controls data transmission / reception between the keyboard device 16 and the CPU 10. That is, the keyboard scan circuit 15 detects the key number of the key pressed or released by the keyboard device 16 and the initial touch data indicating the speed of key depression or key release, and the CPU 1
It is sent to 0.

More specifically, the keyboard scan circuit 15
Sends a scan signal to the keyboard device 16. The keyboard device 16 responds to the scan signal by sending the first contact S
Data indicating the on / off state of the first or second contact S2 is returned to the keyboard scan circuit 15.

The keyboard scan circuit 15 receives the data indicating the on / off state of the first contact S1 or the second contact S2 received from the keyboard device 16 from the first contact S1 or the second contact S2.
If it is determined that there is an event, for example, event information in the format shown in FIG. 2 is generated.

The presence / absence of an event is determined as follows. That is, the first contact S1 obtained in the previous scan
Alternatively, data indicating ON / OFF of the second contact (stored in a RAM (not shown) provided in the keyboard scan circuit 15) and ON / OFF of the first contact or the second contact obtained in this scan are shown. The data is compared, and if they are different, it is determined that there is an event.

The generated event information is stored in the event buffer provided inside the keyboard scan circuit 15. Then, the keyboard scan circuit 15 is C
The PU 10 is interrupted to notify that an event has occurred. The CPU 10 reads the event information stored in the event buffer and stores it in the event stack provided in the RAM 12. The CPU 10 may scan the event buffer of the keyboard scanning circuit 15 at a predetermined cycle, and if new event information is generated, it may be fetched and stored in the event stack.

The event information is, for example, as shown in FIG. 2A, an "S1 / S2" field in which information indicating whether it is the event of the first contact or the event of the second contact is stored. A “key number” field in which information indicating a key number related to a key or a key release is stored, an “on / off” field in which information indicating whether an event is an on event or an off event is stored, and keystroke strength Is stored in the “initial touch data” field in which information indicating

The event information generated by the keyboard scanning circuit 15 is the event of the first contact S1 or the second contact S1.
It is different depending on whether it is two events.

That is, in the case of the on event of the first contact S1, as shown in FIG. 2B, "S1" indicating that it is the event of the first contact is set in the "S1 / S2" field. , The key number of the depressed key is set in the "key number" field, and "on" indicating that the event of the first contact S1 is an on event is set in the "on / off" field. Insignificant indefinite data is set in the "initial touch data" field.

In the case of the off event of the first contact S1, "S1" indicating the event of the first contact is set in the "S1 / S2" field, and "key number" is set.
The key number of the released key is set in the field, and "off" indicating that the event of the first contact S1 is an off event is set in the "on / off" field. Insignificant indefinite data is set in the "initial touch data" field.

Further, in the case of the on event of the second contact S2, as shown in FIG. 2C, "S2" indicating that it is the event of the second contact is set in the "S1 / S2" field. , The key number of the depressed key is set in the "key number" field, and "on" indicating that the event of the second contact S2 is an on event is set in the "on / off" field. In the "initial touch data" field, data relating to the time from when the first contact S1 is turned on to when the second contact is turned on is set as the initial touch data.

In the case of the off event of the second contact S2, "S2" indicating the event of the second contact is set in the "S1 / S2" field, and the "key number" is set.
The key number of the released key is set in the field, and "off" indicating that the event of the second contact S2 is an off event is set in the "on / off" field. Insignificant indefinite data is set in the "initial touch data" field.

The sound source 18 corresponds to the musical tone signal generating means, and is composed of, for example, 32 oscillators. A waveform memory (not shown) is connected to the sound source 18. The waveform memory is composed of, for example, a ROM.
The waveform memory includes, for example, pulse code modulation (PCM).
The generated musical tone waveform data is stored. The musical tone waveform data stored in the waveform memory is composed of a plurality of types of musical tone waveform data corresponding to each key range and each tone color so as to realize a plurality of tone colors.

The sound source 18 receives the tone color parameters and the tone generation start command from the CPU 10, reads the tone waveform data stored in the waveform memory, adds the envelope to the tone waveform data, generates a tone signal, and sends it to the sound system 19. It is a thing. Further, in response to a tone generation end command from the CPU 10, the reading of the musical tone waveform data from the waveform memory is terminated, and the transmission of the musical tone signal to the sound system 19 is stopped.

The sound system 19 is composed of an amplifier, a speaker and the like. Sound system 19
Is a well-known type which amplifies an input musical tone signal with a predetermined gain and outputs the amplified musical tone signal to a speaker, and the speaker converts the musical tone signal into an acoustic signal and outputs the acoustic signal.

Next, the operation of the electronic musical instrument having the above-described structure will be described with a focus on chord detection and automatic accompaniment.

FIG. 3 is a flow chart showing the main routine of the electronic musical instrument, which is started by turning on the power. That is, when the power is turned on, first, initialization processing is performed (step S10).

This initialization process is a process of setting the internal state of the CPU 10 to the initial state and also setting the registers, counters or flags defined in the RAM 12 to the initial state. Further, in this initialization process, a process of sending predetermined data to the sound source 18 and preventing an unnecessary sound from being generated when the power is turned on is also performed.

When this initialization process is completed, a panel switch scan process is performed (step S11). Details of this panel switch scan processing are shown in the flowchart of FIG.

In the panel switch scan process, first,
Event map creation processing is performed (step S2).
0). In this event map creation process, first, the panel scan circuit 13 scans the operation panel 14 to capture the panel data indicating the on / off state of each switch as a bit string corresponding to each switch.

Next, the previously read panel data (which is already stored in the RAM 12) is compared with the currently read panel data to check whether there is a different bit. Then, when there is a different bit, it is recognized that there is a panel event, and an event map in which the bit corresponding to the changed switch is set to ON is created. Whether or not there is a panel event, which will be described below, is determined by referring to this event map.

When the event map is created in step S20, it is then checked whether or not the automatic accompaniment switch is turned on (step S21). This is done by referring to the event map described above.

When it is determined that the automatic accompaniment switch is turned on, it is checked whether or not the AUTO flag is "1" (step S22). Where AUTO
The flag is a flag defined in the RAM 12 and stores whether the electronic musical instrument is in the automatic accompaniment mode or the normal performance mode.

Here, the AUTO flag is "1", that is,
When it is determined that the electronic musical instrument is in the automatic accompaniment mode, the AUTO flag is set to "0" (step S2).
3). On the other hand, if it is determined that the AUTO flag is "0", that is, the electronic musical instrument is in the normal performance mode, the AU
The TO flag is set to "1" (step S24). The toggle function of the automatic accompaniment switch is realized by the processing of steps S21 to S24. This AUTO flag is referred to in the keyboard scanning process and the information accompaniment process described later.

Then, other switch processing is performed (step S25). This process is, for example, a process for each event such as a tone color selection switch, a rhythm selection switch, a volume switch, and a sound effect switch, but since it is not directly related to the gist of the present invention, detailed description thereof will be omitted.

If it is determined in step S21 that the automatic accompaniment switch is not turned on, other switch processing is immediately performed. After that, the process returns from this panel switch scan processing routine and returns to the main routine.

In the main routine, keyboard scanning processing is then performed (step S12). Details of the keyboard scanning process are shown in the flowchart of FIG.

In the keyboard scanning process, first, the first contact S
It is checked whether or not there is a key for which 1 is turned on (step S31). This is done by checking the contents of the "S1 / S2" field and the contents of the "on / off" field in the event information stored in the event stack.

If it is determined that there is a key whose first contact point S1 is turned on, a key-depression bitmap updating process is performed (step S32). Here, the key depression bit map is a buffer provided in the RAM 12, and stores the ON or OFF state of the first contact S1 of each key of the keyboard device 16 in association with the bit. The key-depression bitmap updating process performed here is a process of setting the corresponding bit in the key-depression bitmap corresponding to the key number included in the event information to “1”.

Then, it is checked whether or not the AUTO flag is "1" (step S33). And AUT
When it is determined that the O flag is "1", that is, the automatic accompaniment mode, it is determined whether or not the key number included in the event information indicates a key in the chord detection key range (step S34). . When it is determined that the key is in the code detection key range, code detection processing is performed (step S35), and then the process branches to step S36. Details of the code detection process will be described later.

On the other hand, in step S31, the first contact S1
If there is no key that has been turned on, A in step S33 above
If it is determined that the UTO flag is "0", that is, it is in the normal performance mode, and if it is determined in step S34 that the key is not in the chord detection key range, the process proceeds to step S36.

In step S36, it is checked whether or not there is a key whose second contact S2 is turned on. This is "S1 / S" in the event information stored in the event stack.
This is done by examining the contents of the "2" field and the contents of the "on / off" field.

When it is determined that there is a key whose second contact S2 is turned on, it is checked whether or not the AUTO flag is "1" (step S37). And AU
When it is determined that the TO flag is "1", that is, the mode is the automatic accompaniment mode, it is checked whether or not the key number included in the event information indicates a key in the chord detection key range (step S38). .

If it is determined that the key is not in the chord detection key range, a tone generation process is performed to generate a normal tone (step S39). Then, after that, the process proceeds to step S40. On the other hand, if it is determined that the key is in the chord detection key range, the sound generation process is skipped and step S4 is performed.
Go to 0.

The tone generation process is a process for transmitting a tone color parameter (waveform address, frequency data, envelope data, filter coefficient, etc.) to the above-described tone generator 18 to generate a tone signal. As a result, as described above, the musical sound is emitted through the sound system 19.

If it is determined in step S37 that the AUTO flag is "0", that is, it is in the normal performance mode, the process branches to step S39, and sound generation processing is performed.
If there is no key whose second contact S2 is turned on in step S36, steps S37 to S39 are skipped and the process proceeds to step S40.

In step S40, it is checked whether or not there is a key whose first contact S1 is turned off. This is "S1 / S" in the event information stored in the event stack.
This is done by examining the contents of the "2" field and the contents of the "on / off" field. Here, the first contact S
If it is determined that there is no key for which 1 is off, the routine returns from this keyboard scan processing routine and returns to the main routine.

On the other hand, when it is determined that there is a key whose first contact S1 is turned off, the key-depression bitmap updating process is performed (step S41). The key-depression bitmap updating process performed here is a process of setting the corresponding bit in the key-depression bitmap corresponding to the key number included in the event information to “0”. By the process of step S41 and the process of step S32, the key depression bitmap is constantly updated in correspondence with ON / OFF of the first contact S1.

Next, a muffling process is performed (step S
42). The sound deadening process is a process of sending predetermined data to the above-described sound source 18 to stop the generation of the tone signal. As a result, the musical sound emitted through the sound system 19 is muted. After this mute processing, the keyboard scan processing routine returns and returns to the main routine.

The details of the code detection process performed in step S35 described above are shown in the flowchart of FIG.

That is, first, an octave bitmap is created (step S50). The octave bitmap is, for example, as shown in FIG. 8 (A), obtained by compressing the on / off state of a key in the code detection key range into data for one octave.

More specifically, the octave bitmap is the step S3 of the keyboard scan processing routine (FIG. 5).
2 and only the part corresponding to the code detection key range of the key depression bitmap updated in S41 is extracted, and this is further added to 1
It is created by dividing each octave (for example, one octave from note name C to B as shown in FIG. 8A) and taking the logical sum of the data of each one octave.

As a result, regardless of which octave the note name belongs to, an octave bitmap that specifies only the type of note name is created.

Next, code detection processing is performed (step S51). In the code detection process, for example, a plurality of code detection data prepared in advance corresponding to a code pattern as shown in FIG. 8B and the octave bitmap created in step S50 are sequentially compared. If the matching code detection data is found,
The code corresponding to the code detection data is the detected code. The code detecting method is not limited to the above, and any known code detecting method can be used.

Next, the code data corresponding to the code detected above is stored in a predetermined area of the RAM 12 (step S52). Thereafter, the routine returns from this code detection processing routine and returns to step S36 of the keyboard scan processing routine. The code data detected by this code detection processing routine and stored in the predetermined area of the RAM 12 is
It is referred to in an automatic accompaniment processing routine that will be performed later.

In the main routine, automatic accompaniment processing is then performed (step S13). The outline of this automatic accompaniment process is shown in the flowchart of FIG. In this flowchart, the tone color changing process is omitted.

In the automatic accompaniment process, it is first checked whether or not the AUTO flag is "1" (step S3).
7). When it is determined that the AUTO flag is "0", that is, the normal performance mode, it is returned from the automatic accompaniment processing routine without performing any processing.

On the other hand, when the AUTO flag is "1", that is, when it is determined that the automatic accompaniment mode is set, the automatic accompaniment data is read (step S61). This is RO
This is a process of extracting only one piece of automatic accompaniment data stored in M11.

Next, it is checked whether or not it is the sounding timing (step S62). This is performed by comparing the time value counted up by a time counter (not shown) with the step time included in the automatic accompaniment data extracted above. If it is determined that it is not the sounding timing, the process branches to step S65.

On the other hand, when it is determined that it is the sounding timing, a chord expanding process is performed (step S6).
3). The chord expanding process is a process of changing data stored in advance in the ROM 11, for example, as a chord pattern according to the key number included in the automatic accompaniment data and the chord data detected by the chord detecting process.
An example of the code expansion processing is, for example, Japanese Patent Laid-Open No. 4-30197.
It is shown in the publication. By this chord expanding process, a musical sound to be actually pronounced is determined as an accompaniment sound.

Next, a tone generation process is performed (step S
64). That is, the tone generator 18 generates tone color parameters (waveform address, frequency data, envelope data, filter coefficient, etc.) determined by the musical tone determined by the chord expansion process and the initial touch data (velocity) included in the automatic accompaniment data. Send to. As a result, the tone signal is generated by the sound source 18, and the accompaniment sound is emitted through the sound system 19.

Next, it is checked whether or not it is the muffling timing (step S65). This is performed by checking whether or not the tone generation time of the musical tone being sounded has passed the time designated by the gate time in the automatic accompaniment data instructing the tone generation. When it is determined that it is not the mute timing, the process returns from the automatic accompaniment processing routine and returns to step S14 of the main routine.

On the other hand, if it is determined that it is the muffling timing, the muffling process is performed (step S66). This is done by sending predetermined data to the sound source 18. As a result, the accompaniment sound emitted through the sound system 19 is muted. After that, the process returns from the automatic accompaniment processing routine and returns to step S14 of the main routine.

Other processing is performed in the main routine (step S14). In this "other processing",
For example, a process of transmitting / receiving MIDI data to / from an external device via the MIDI interface circuit 17 is performed.

As described above, step S of the main routine
When an event corresponding to a panel operation or a keyboard operation occurs in the process of repeatedly executing 11 to S14, various functions of the electronic musical instrument are realized by performing a process corresponding to the event.

As described above, according to this embodiment, the on-event information and the key number of the first contact S1 obtained from the keyboard device 16 via the keyboard scanning circuit 15 are received, and the received key number is the code detecting key. When the key of the range is indicated, chord detection processing is started based on the key number to perform chord detection, and a musical tone signal which is an accompaniment tone is generated according to the detected chord.

As a result, the entire key range of the keyboard device 16 can be divided into a chord detection key range and a normal performance key range, and when a key in the chord detection key range is pressed, As described above, since the chord detection processing is completed at an earlier time than when the chord detection processing is started after the second contact S2 is turned on, there is a gap between the key being pressed and the chord sound being emitted. Get smaller.

Therefore, the chord sound is generated at the timing intended by the performer, so that the natural chord progression is possible. On the other hand, when a key within the normal playing key range is pressed, the normal sounding based on the key number and the initial touch data is performed after the second contact S2 is turned on as in the conventional case.

According to this electronic musical instrument, while pressing the key area for chord detection to generate an accompaniment sound at the timing intended by the performer, for example, a key in the key area for normal performance is pressed to produce a melody. It becomes possible to play and provide an electronic musical instrument with excellent operability.

[0104]

As described in detail above, according to the present invention,
Since it is possible to shorten the time from when the key is pressed until the chord is detected and each of the musical tones that make up the chord is pronounced,
It is possible to provide an electronic musical instrument in which a chord sound is generated at a timing intended by a performer and natural chord progression is possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an electronic musical instrument of the present invention.

FIG. 2 is a diagram for explaining event information used in an example of the present invention.

FIG. 3 is a flowchart (main routine) showing the operation of the embodiment of the present invention.

FIG. 4 is a flowchart (panel switch scan processing routine) showing the operation of the embodiment of the present invention.

FIG. 5 is a flowchart (keyboard scan processing routine) showing the operation of the embodiment of the present invention.

FIG. 6 is a flowchart (code detection processing routine) showing the operation of the embodiment of the present invention.

FIG. 7 is a flowchart (automatic accompaniment processing routine) showing the operation of the embodiment of the present invention.

FIG. 8 is a diagram illustrating a code detection process according to the embodiment of this invention.

[Explanation of symbols]

 10 CPU 11 ROM 12 RAM 13 Panel Scan Circuit 14 Operation Panel 15 Keyboard Scan Circuit 16 Keyboard Device 17 MIDI Interface Circuit 18 Sound Source 19 Sound System 20 System Bus

Claims (2)

[Claims] 1. Two keys that are turned on or off at different pressing depths, and each key has a first contact that first turns on when pressed and a second contact that turns on later, and at least a key position. And a keyboard device that outputs key information indicating the ON and OFF information of the first contact, and when the ON information of the first contact is received from the keyboard device,
A code detecting means for starting code detection based on the key information to detect the code; and a musical tone signal generating means for generating a musical tone signal relating to the code detected by the code detecting means. Electronic musical instrument. 2. Two keys which are turned on or off at different pressing depths, and each key has a first contact which is first turned on when pressed and a second contact which is turned on later, and at least a key position. And a keyboard device that outputs key information indicating the ON and OFF information of the first contact, and when the ON information of the first contact is received from the keyboard device,
When the key information indicates a key position within a predetermined predetermined key range, the code detection means starts code detection based on the key information and detects a code, and the code detection means detects the code. A musical tone signal generating means for generating a musical tone signal related to a chord, and an electronic musical instrument.