JPH07121176A - Accompaniment contents detecting device and automatic accompaniment device - Google Patents

Abstract

PURPOSE:To provide the accompaniment contents detecting device and automatic accompaniment device which enable an automatic accompaniment of fractional chords through easier key operation. CONSTITUTION:The accompaniment contents detecting device is equipped with a chord detecting means 31 which detects a chord corresponding to the depression pattern of keys in a specific area of a keyboard device 11 and a bass root detecting means 31 which detects a bass root corresponding to the depression pattern of the keys in the specific area. The automatic accompaniment device is equipped with a chord detecting means 31 which detects whether or not a chord is generated and the kind of the chord when more than a specific number of keys in the specific area of the keyboard device 11 are pressed, chord sound generating means 33, 34, and 15 which generate a chord sound when the generation of the chord is detected or previous chord sounds successively when not, a bass root detecting means 31 which detects a bass root corresponding to the depression pattern of the keys in the specific area, and bass sound generating means 34, 35, and 15 which generate bass sounds on the basis of the detected bass root.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accompaniment content detection device for an electronic musical instrument for detecting accompaniment content associated with keyboard operation, and an automatic accompaniment device to which the accompaniment content detection device is applied.

[0002]

2. Description of the Related Art In recent years, electronic musical instruments having an automatic accompaniment device have been developed and put into practical use. As one type of such electronic musical instruments, a keyboard for chord detection for using the keyboard for chord detection and a keyboard for normal performance used for normal performance (for example, melody performance) are divided into two types, depending on whether a key is pressed or released. It is known that chord detection is performed to automatically generate an accompaniment sound consisting of a chord sound, a bass sound, and a drum sound, while a normal musical sound is generated in response to a key press or key release of a normal performance keyboard. ing. The chord detection keyboard of such an electronic musical instrument does not generate a musical tone having a pitch corresponding to the key even when the key is pressed, and is used only for designating a chord.

More specifically, generation of an accompaniment sound in the electronic musical instrument is performed as follows. That is, first,
Code detection is performed according to the pressing pattern of the code detection keyboard. In this code detection, a code (composed of a chord root and a chord type) corresponding to the key pressing pattern is detected. Next, the automatic accompaniment data stored in advance in the storage means is read out, expanded according to the detected chord, and the expanded data is sent to the sound source to generate an accompaniment sound. .

However, in an electronic musical instrument that has a plurality of parts (chord part, bass part, drum part, etc.) and each part independently generates an automatic accompaniment sound, the above-mentioned chord is used for the musical sound of the chord part. Although it is possible to generate chord sounds by performing detection and chord expansion, there was no unique reference sound (bass root) for the bass part. Therefore, conventionally, a bass sound is generated for a bass part by developing a specific sound of the chord constituent sounds obtained by the above chord detection, for example, a chord root sound as a bass root. However, the automatic accompaniment apparatus configured such that the chord root and the bass root always match each other cannot deal with the automatic accompaniment of fractional chords.

Therefore, a keyboard for base detection is specially defined on the keyboard, and the base route is detected according to the key depression or key release of the keyboard for base detection, while the code also includes the keyboard for base detection. The applicant of the present invention has considered that all the keys are detected (for example, Japanese Patent Laid-Open No. 4-301).
(See Japanese Patent Publication No. 97). According to this automatic accompaniment device, the bass root and the chord root can be specified separately while matching the chord sound and the bass sound, so that the fractional chord can be automatically accompanied.

[0006]

However, in the automatic accompaniment device disclosed in Japanese Patent Laid-Open No. 4-30197, the chord detection is performed in the entire key range, so that the performance is performed using the automatic accompaniment function. However, there is a problem that a very high technology is required when performing. For example, when a certain melody is played, chord detection is also performed with respect to the key depression for making the melody sound, and the accompaniment sound is pronounced based on the detected chord. Therefore, when a performer with a poor performance technique performs, a chord sound not intended by the performer may be emitted, which is inconvenient.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an accompaniment content detecting device and an automatic accompaniment device capable of performing automatic accompaniment of a fractional chord by a simpler key operation.

[0008]

In order to achieve the above-mentioned object, an accompaniment content detecting device of the present invention has a keyboard device having a specific area for detecting the accompaniment content, and a key in a specific area of the keyboard device. It is characterized by comprising a code detecting means for detecting a code according to a pressing pattern and a base route detecting means for detecting a base root according to a pressing pattern of a key in a specific area of the keyboard device.

Further, in the accompaniment content detecting apparatus of the present invention, for the same purpose as described above, the bass root detecting means outputs the sound of the key corresponding to the lowest pitch of the keys pressed in the specific key range. It is characterized by making it a base route.

In order to achieve the above object, the automatic accompaniment apparatus of the present invention has a keyboard device having a specific area for detecting the accompaniment content, and a predetermined number or more keys of the specific area of the keyboard device are pressed. When the chord is detected, chord detection means for detecting the success or failure of the chord and the kind of the chord according to the pressing pattern, and a chord sound corresponding to the chord detected when the chord detection means detects the chord establishment. Generated, a chord sound generating means for continuously generating the previous chord sound when the chord establishment is not detected, and a base root for detecting a base root according to a key pressing pattern in a specific area of the keyboard device. It is characterized by comprising a detecting means and a bass sound generating means for generating a bass sound based on the bass route detected by the bass route detecting means.

Further, in the automatic accompaniment apparatus of the present invention, for the same purpose as described above, the bass route detecting means is a base note of a key corresponding to the lowest note of the keys pressed in the specific key range. It is characterized by being a route.

[0012]

In the accompaniment content detecting device of the present invention, when a key in a specific area of the keyboard device, for example, a key range predetermined as a chord detecting keyboard is depressed, a chord (for example, Chord root and chord type). Further, the base route is detected according to the key pressing pattern in the specific area. The bass root detected here is, for example, the sound of the key corresponding to the lowest note of the pressed keys. The chord and bass root detected in this way are used as data for automatic accompaniment.

Conventionally, chord detection is performed according to a key depression pattern of a keyboard device, and a specific sound, for example, the lowest sound, among the constituent sounds of the detected chord is used as a base route. Therefore, when a specific chord is designated, the bass root is uniquely determined regardless of the pressing pattern, and there is no room for selecting the bass root sound with one chord. On the other hand, according to the present invention, for example, if the sound of the key corresponding to the lowest note of the pressed keys is used as the bass root, it is possible to select a plurality of bass root sounds according to the pressing pattern. .

As described above, according to the present invention, on the keyboard device,
Areas for detecting accompaniment contents, that is, chords and bass roots are set in advance, and chords and bass roots are detected, so the chords intended by the performer are specified as compared to when chord detection is performed in the entire key range. It is easy to do. Further, even if the same chord is designated, the bass root can be made different depending on the pressing pattern, so that the performance of the fractional chord can be dealt with.

In the automatic accompaniment apparatus of the present invention,
When a certain number of keys in a specific area of the keyboard device, for example, a predetermined key range as a code detection keyboard, are pressed, the success or failure of the code according to the pressing pattern and the code when the code is established The type (eg, chord root and chord type) is detected. Then, when it is detected that the chord is established, a chord sound corresponding to the detected chord is generated. On the other hand, when it is detected that the chord is not established (including the case where a predetermined number of keys are not pressed), the musical sound that has been generated up to that point is continuously generated.

Further, the base route is detected according to the key pressing pattern in the specific area. The bass root detected here is, for example, the sound of the key corresponding to the lowest note of the pressed keys. The detection of the base route is performed independently of the success or failure of the code.

When the sound of the key corresponding to the lowest note of the pressed keys of the keyboard device is used as the bass root, a plurality of bass root sounds can be selected according to the pressing pattern. The same as in the case of the detection device.

In addition, in this automatic accompaniment apparatus, when the chord is not established (including the case where the predetermined number of keys are not pressed), the sound of the conventional chord sound is continued. If you want to play fractional chords by sequentially changing the bass tone, set the number of keys to be pressed below a certain number, or press the desired keys in sequence so that the chords are not established. An application is possible in which only the bass sound is changed to a desired sound while continuing the sound. As a result, when the chord sound and the bass sound intended by the performer are generated, the keyboard operation is easier than in the case where chord detection is performed in the entire keyboard range.

[0019]

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 to which an accompaniment content detection device and an automatic accompaniment device according to the present invention are applied.

In FIG. 1, 10 is a central processing unit (hereinafter referred to as "CPU"), 11 is a keyboard device, 12 is an operation panel, 13 is a display, 14 is an automatic accompaniment data storage section, and 15 is a tone signal generation. Reference numeral 16 is an amplifier, and 17 is a speaker.

The CPU 10 has a key press detecting section 30, a code detecting section 31, and a data reading section 3 which are realized by software functions or both software and hardware functions.
2, a chord expanding unit 33, a bass expanding unit 34, a sound generation channel assigning unit 35, and a display control unit 36. Details of each of these components will be described later.

A read-only memory (hereinafter referred to as "ROM") not shown is connected to the CPU 10 and stores a control program for operating the CPU 10 and various fixed data. Further, the ROM stores a code table used for code detection as shown in FIG. 2, for example. In this chord table, chord bit pattern data in which a constituent note of each chord is associated with “1” is stored for each chord type such as major, minor, seventh, ... .

A random access memory (hereinafter referred to as "RAM"), which is not shown, is connected to the CPU 10, and each area such as a buffer, a register, a counter or a flag for the CPU 10 to use for various processes. Is provided. For example, a chord root area, a chord type area, a base root area, an octo chord area and the like used in chord detection processing are provided.

Further, the CPU 10 includes a timer (not shown), and this timer is adapted to generate an interrupt at regular time intervals. The number of times this timer interrupt is
It is counted by a timer counter provided in a RAM (not shown). This timer counter is used in an automatic accompaniment process described later to check whether or not there is an automatic accompaniment event, that is, whether or not a predetermined automatic accompaniment data sound generation timing has come.

The keyboard device 11 is provided with a plurality of keys for designating a pitch. The keyboard device 11 is used to specify a sound to be sounded by the entire keyboard range in the normal playing mode, but in the automatic accompaniment mode, a chord is detected on the lower side, for example, as a split point between two consecutive consecutive keys. The keyboard and upper side are functionally separated as a normal playing keyboard. Hereinafter, the function of separately using the keyboard device 11 will be referred to as a split function. Note that the automatic accompaniment mode is a mode in which an automatic accompaniment sound is generated based on the automatic accompaniment data stored in the automatic accompaniment data storage unit 14, and the normal performance mode is a key press or key release of the keyboard device 11. In this mode, musical tones are generated based on the generated data. In this embodiment, for example, as shown in FIG. 3, the split point is between the key numbers F # 2 and G2. Therefore, the chord detection keyboard is a key having a key number of A0 to F # 2, and the normal performance keyboard is a key having a higher tone range than the key number G2.

The chord detecting keyboard corresponds to a specific area of the keyboard device and is used for chord designation and bass root designation. The chord detecting keyboard does not generate a musical tone having a pitch corresponding to the depressed key, but is used only for designating a chord and a bass route. On the other hand, the normal performance keyboard is used to specify the sound to be pronounced. In the present embodiment, the split function is configured to operate when the automatic accompaniment mode is set, but not when the automatic accompaniment mode is set.
The split function may be activated when a predetermined switch is pressed.

The keyboard device 11 outputs data consisting of a bit string in which the on / off state of each key corresponds to 1 bit. At this time, no particular distinction is made between the data output from the chord detection keyboard and the data output from the normal performance keyboard. The data output by the keyboard device 11 is
It is sent to the key depression detection unit 30 of the CPU 10. As the keyboard device 11, for example, a two-contact type keyboard device for detecting so-called initial touch data can be used.

The operation panel 12 is for instructing the electronic musical instrument to perform various operations, and is composed of a plurality of switches and a display. The automatic accompaniment switch 120 used in this embodiment is mounted on the operation panel 12.
The automatic accompaniment switch 120 is a switch for controlling the start or stop of the automatic accompaniment, and is specifically used for instructing the start / stop of the reading of the automatic accompaniment data in the data reading unit 32 described later.

The operation panel 12 is provided with various switches other than the above, for example, a tone color switch for changing the tone color, a volume switch for changing the volume, a rhythm switch for changing the rhythm, etc. Since it is not directly related to, the description is omitted.

Display 1 provided on the operation panel 12
3 is composed of an LCD display, for example. The display 13 displays the state of the electronic musical instrument and various messages from the electronic musical instrument, such as the chord root, chord type and bass root detected in the automatic accompaniment mode. The display content of the display 13 is updated according to the data sent from the display control unit 36 of the CPU 10.
Although an example of an LCD display is shown as the display 13 in the present embodiment, the display is not limited to the LCD display, and an LED display, a CRT, a plasma display, and various other displays may be used. be able to.

The automatic accompaniment data storage section 14 stores automatic accompaniment data used for automatic accompaniment, and is composed of, for example, a read-only memory (hereinafter referred to as "ROM"). In the automatic accompaniment data storage unit 14,
Three types of automatic accompaniment data are stored: chord part data, bass part data, and drum part data. In the chord part data, a plurality of chord playing patterns corresponding to various rhythms are stored as note data having a pitch and a pitch based on the note name C, for example. In the bass part data, a plurality of bass performance patterns corresponding to various rhythms are stored as note data having a pitch and a pitch based on the note name C, for example. In the drum part data, a plurality of drum performance patterns corresponding to various rhythms are stored as note data having a predetermined pitch and length. The automatic accompaniment data storage unit 14 is connected to the data reading unit 32 of the CPU 10.

The tone signal generating section 15 corresponds to a part of the chord sound generating means and the bass sound generating means. The tone signal generator 15 has a plurality of oscillators,
A tone signal is generated using the oscillator assigned by the tone generation channel assigning unit 35 of the CPU 10. The tone signal generator 15 generates tone signals corresponding to the operation of the keyboard device 11, chord sounds corresponding to the automatic accompaniment data, bass sounds, and drum sounds. The tone signal generated by the tone signal generator 15 is amplified by the amplifier 16 in a predetermined manner and is emitted through the speaker 17.

Next, each block realized by the CPU 10 will be described. The key depression detection unit 30 is the keyboard device 1.
The key number and the initial touch data of the depressed or released key are detected based on the data consisting of a bit string in which the on / off state of each key sent from 1 corresponds to 1 bit. All the key numbers and initial touch data (hereinafter collectively referred to as "keyboard data") detected by the key depression detecting unit 30 are sent to the sound generation channel assigning unit 35 in the normal performance mode. On the other hand, in the automatic accompaniment mode, keyboard data corresponding to the chord detecting keyboard is sent to the chord detecting section 31, and keyboard data corresponding to the normal playing keyboard is sent to the sounding channel assigning section 35.

The chord detection section 31 corresponds to chord detection means and base route detection means, receives chord data sent from the chord detection keyboard of the above-mentioned key depression detection section 30, and performs chord detection (chord root and chord root detection). Code type detection) and base route detection. The code detection method and the base route detection method will be described in detail later. The code (code root and code type) detected by the code detection unit 31 is sent to the display control unit 36 and the code development unit 33, and the base route is sent to the display control unit 36 and the base development unit 34.

The data reading section 32 sequentially reads the chord part data, the bass part data and the drum part data from the automatic accompaniment data storage section 14 in a time division manner in response to an instruction from the automatic accompaniment switch 120 of the operation panel 13. is there. The chord part data read by the data reading section 32 is sent to the chord expanding section 33, the bass part data is sent to the bass expanding section 34, and the drum part data is sent to the sounding channel assigning section 35.

The chord expanding section 33 corresponds to a part of the chord sound generating means, and expands the chord part data received from the data reading section 32 according to the chord sent from the chord detecting section 31. . Regarding the operation of this code expansion, for example, the above-mentioned Japanese Patent Laid-Open No. 4-30
197. This code expansion unit 33
The musical tone data generated by the chord expansion in (1) is sent to the sound generation channel assigning unit 35.

The bass expanding section 34 corresponds to a part of the bass sound generating means, and expands the bass part data received from the data reading section 32 in accordance with the bass route sent from the chord detecting section 31. is there. Regarding the operation of this base expansion, the above-mentioned Japanese Patent Laid-Open No. 4-30
197. This base expansion unit 34
The tone data generated by the bass expansion in (1) is sent to the sound generation channel assigning unit 35.

The tone generation channel assigning unit 35 reads keyboard data sent from the key depression detecting unit 30, musical tone data sent from the chord developing unit 33, musical tone data sent from the bass developing unit 34, or data reading. It receives the drum part data sent from the unit 32, assigns a sounding channel when these are data instructing sounding, and releases the sounding channel when these are data instructing mute.

Here, the tone generation channel corresponds to the oscillator (1 or 2 or more) included in the tone signal generation section 15, and the tone generation channel assignment means that when data for instructing tone generation is sent, This is a process of deciding which oscillator in the tone signal generator 15 should be used to generate a sound. When a tone generation channel is assigned by the tone generation channel assigning unit 35, information to that effect and various data relating to tone generation instructions are sent to the tone signal generating unit 15. As a result, a tone signal is generated in the tone signal generator 15 using the assigned tone generation channel, amplified by the amplifier 16 and supplied to the speaker 17, whereby a predetermined tone is emitted. .

The display control unit 36 of the CPU 10 is the display 1
The control is performed when the display 3 is made to perform various displays.
The display control unit 36 receives, for example, each data of the chord (chord route and chord type) and the base route from the chord detection unit 31, converts the data into a format that can be displayed on the display 13, and indicates the display position. Data to be added is sent to the display unit 13. As a result, the chord root, chord type, and base root are displayed on the predetermined portion of the display unit 13.

Next, the operation of the accompaniment content detecting apparatus of the present electronic musical instrument having the above-mentioned configuration will be described with reference to the flow charts shown in FIGS.

FIG. 4A is a flowchart showing the main routine of the present 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 C
This is a process of setting the internal state of the PU 10 to the initial state and setting the registers, counters, flags, etc. defined in the RAM (not shown) to the initial state. Also,
In this initialization process, a process of sending predetermined data to the tone signal generator 15 and preventing an unnecessary sound from being generated when the power is turned on is also performed.

Upon completion of this initialization processing, panel processing is then carried out (step S11). Details of this panel process are shown in the flowchart of FIG.

In the panel processing, first, it is checked whether or not there is a panel event (step S20). This is done as follows. That is, first, the CPU 10 scans the operation panel 12 to display panel data indicating the on / off state of each switch (hereinafter, “new panel data”).
Say. ) Is taken in as bit string data corresponding to each switch.

Next, the RAM that was read previously and is not shown
The panel data already stored in (hereinafter referred to as "old panel data") is compared with the new panel data read this time, and an event map in which different bits are turned on is created. Whether or not there is a panel event in step S20 is determined by referring to this event map and checking whether or not there is a bit that is turned on.

If it is determined that there is no panel event, the panel processing routine is returned to the main routine without performing any processing. on the other hand,
When it is determined that there is a panel event, it is checked whether or not the event is the event of the automatic accompaniment switch 120 (step S21). This is performed by checking whether the bit corresponding to the automatic accompaniment switch 120 in the event map created above is turned on.

If it is determined that the event is the automatic accompaniment switch 120, it is then checked whether or not the automatic accompaniment mode is currently set (step S22). This is done by checking whether the automatic accompaniment flag is on. Here, the automatic accompaniment flag is a flag defined in a RAM (not shown) and stores whether the accompaniment content display device of the electronic musical instrument is in the automatic accompaniment mode or the normal performance mode. The automatic accompaniment flag is set to "1" in the automatic accompaniment mode and to "0" in the normal performance mode.

When it is determined in step S22 that the automatic accompaniment mode is not set, that is, the automatic accompaniment flag is "0".
If it is determined that the value is, the automatic accompaniment flag is set to "1" (step S24). At the same time, the timer counter provided in the RAM (not shown) starts counting up.

On the other hand, when it is determined that the automatic accompaniment mode is set, that is, when the automatic accompaniment flag is "1", the automatic accompaniment flag is cleared to "0" (step S23). At the same time, counting up of the timer counter is stopped. The steps S22 to S24 realize a toggle function in which the automatic accompaniment mode and the normal performance mode are alternately inverted each time the automatic accompaniment switch 120 is pressed. If it is determined in step S21 that the event is not the automatic accompaniment switch 120, the processes in steps S22 to S24 are skipped.

Then, "other switch processing" is performed (step S25). This "other switch processing" is processing for switch operations provided on the operation panel 12 other than the above.

For example, tone color switching processing corresponding to the operation of the tone color switch, volume changing processing corresponding to the operation of the volume switch, rhythm changing processing corresponding to the operation of the rhythm switch, etc. are performed. Since the contents of the processing corresponding to each switch are not directly related to the present invention, the description thereof will be omitted. After that, the process returns from this panel processing routine and returns to the main routine.

In the main routine, keyboard processing is then carried out (step S12). For details of this keyboard processing,
This is shown in the flow chart of FIG. In this keyboard processing, the chord and base root detection processing related to the features of the present invention is performed.

In the keyboard processing, it is first checked whether or not there is a keyboard event (step S30). This is done as follows. That is, first, the key pressing detection unit 30 of the CPU 10
By scanning the keyboard device 11, the data indicating the on / off state of each key (hereinafter referred to as "new keyboard data") is fetched as bit string data corresponding to each key.

Next, the RAM that was read last time and is not shown
The keyboard data (hereinafter referred to as "old keyboard data") that has already been stored in is compared with the new keyboard data read this time, and an event map with different bits turned on is created. The determination as to whether or not there is a keyboard event performed in step S30 is performed by checking whether or not there is a bit that is turned on in this event map.

If it is determined that there is no keyboard event, no processing is performed and the processing returns from this keyboard processing routine to the main routine. On the other hand, if it is determined that there is a keyboard event, it is checked whether the automatic accompaniment flag is "1" (step S31).
When it is determined that the automatic accompaniment flag is "0", that is, the normal performance mode, the process branches to step S33 to perform the key depression / key release process (details will be described later).

On the other hand, if it is determined that the automatic accompaniment flag is "1", that is, the automatic accompaniment mode is set, then it is checked whether or not the event is the chord detection keyboard event (step S32). This is performed by checking whether or not the key number in the keyboard data is a number on the lower tone side than the split point. If it is determined that the event is not the chord detection keyboard event, that is, the normal performance keyboard event, key depression / key release processing is performed (step S33).

The key depression / key release process is performed as follows. That is, the keyboard data output from the key depression detecting unit 30 is sent to the sound generation channel assigning unit 35. When the received keyboard data is data indicating a key depression, the tone generation channel assignment unit 35 assigns a tone generation channel, and sends information about the assigned tone generation channel and keyboard data to the tone signal generation unit 15. As a result, the tone signal generator 15 generates a tone signal using the assigned tone generation channel, and the tone signal is generated through the amplifier 16 and the speaker 17.

On the other hand, in the case of the data indicating the key release, the sounding channel assigning unit 35 searches for the sounding channel. Then, the predetermined data relating to the searched tone generation channel is sent to the musical tone signal generator 15. As a result, the generation of the tone signal in that tone generation channel is stopped, and the tone generated by the amplifier 16 and the speaker 17 is stopped. After that, the process returns from this keyboard processing routine and returns to the main routine.

On the other hand, when it is determined in step S32 that the event is the chord detection keyboard event, the chord and the base route are detected.

That is, first, the key that has the key-depression event is
It is checked whether or not the currently pressed key corresponds to the lowest note (step S34). When it is determined that the key corresponds to the lowest note, the bass route is updated (step S35). This is RAM
The bass root area of is rewritten with the note name corresponding to the key. Hereinafter, in the automatic accompaniment process, the bass expansion is performed using the note name of the bass root area. On the other hand, when it is determined that the key having the key-depression event is not the key corresponding to the lowest tone among the keys currently being pressed, the process of step S35 is skipped and the base route is not updated. .

Then, the octocode area of the RAM is cleared (step S36). Next, a synthetic octocode is created (step S37). Specifically, first, the logical sum of the new keyboard data of key numbers A0 to B0 and the contents of the octocode area is calculated, and the result is stored in the octocode area. The keyboard data corresponding to the nonexistent keys (key numbers C0 to G0 and G2 to B2) are logically ORed with "0".

Then, it is checked whether or not the synthesis is completed (step S38). That is, it is checked whether or not the calculation for the octave to which the key number C2 belongs is completed. Then, if it is determined that the composition is not completed, step S37.
Then, the logical sum for the next octave is taken and the result is stored in the octocode area. This operation is repeated until the end of composition is recognized (three times in this embodiment), and then the process proceeds to step S39. At this point, the octocode area stores an octocode in which the bit corresponding to the note name of the pressed key on the chord detection keyboard is set to "1".

Next, it is checked whether or not three or more keys are turned on (step S39). That is, it is checked whether or not there are three or more bits set to "1" in the octocode area. When it is determined that three or more keys are not turned on, the process returns from the keyboard processing routine to the main routine without performing the following processing. This processing realizes a function in which chord detection is not performed unless three or more keys are pressed, and the chord previously detected is subsequently used for chord expansion in automatic accompaniment. However, even in this case,
Since the base route is detected as described above, 1
By pressing the key or the two keys, the chord can be played while changing the bass route only while maintaining the previous state of the chord. In the present embodiment, the code detection is not performed unless three or more keys are turned on, but the code detection may be performed if two or more keys are not turned on. .

On the other hand, if it is determined in step S39 that three or more keys are on, then the code root area of the RAM is cleared (step S40). Next, the synthetic octocode and the code table are compared (step S41). That is, the code bit pattern data of each code type is sequentially read from the beginning of the ROM code table (not shown), and it is checked whether or not there is one that matches the combined octo code. If there is no match, the composite octocode is ring-shifted by 1 bit to the left or right (step S42). Then, the content of the chord root, that is, the chord root area is incremented (step S43). Then, it is checked whether or not the code root has become “12”, in other words, whether or not 12 ring shifts have been completed (step S4).
4).

When it is determined that the code root is not "12", the process returns to step S41 and the same process is repeated. In this repeated execution,
When it is determined in step S44 that the code root has become "12", that is, it is determined that there is no one that matches the code bit pattern data corresponding to all code roots of all code types. , It is recognized that the code is not established, and the process when the code is not established is performed (step S45). In this chord unsuccessful process, the chord detection unit 31 sends all keyboard data of the depressed key to the chord expansion unit 33. The chord expanding unit 33 assigns pitch data in the keyboard data received from the chord detecting unit 31 and pitch length data in the chord part data received from the data reading unit 32 to a sound generation channel in an automatic accompaniment process described later. Send to section 35. As a result, the tone signal generator 15 produces the tone of the depressed key in accordance with the rhythm of the chord part data.

Next, a display process is performed (step S
46). In this display process, the display control unit 36
The chord root and chord type are controlled so that the one already displayed at that time is continuously displayed. Regarding the base route, when the base route is updated, it is controlled to display the changed base route, and when the base route is not updated, the one displayed at that time is changed. Control to display continuously. After that, the process returns from this keyboard processing routine and returns to the main routine.

In the process of repeatedly executing steps S41 to S44, if it is determined in step S41 that a code that matches the composite octocode exists in the code table, it is recognized that the code has been detected, and the code is detected. The type is updated (step S47). That is, the data indicating the matched code type is written in the code type area. Next, the code root is updated (step S
48). This code route is based on steps S41 to S above.
It is a value obtained by incrementing the synthesized octo code each time the ring shift is performed in the repeated execution of 44, and is already stored in the code root area.

Next, a display process is performed (step S
49). In this display process, the display control unit 36
The chord root and chord type are controlled to display the newly detected one. Regarding the base route, when the base route is updated, it is controlled to display the changed base route, and when the base route is not updated, the one displayed at that time is changed. Control to display continuously. After that, the process returns from this keyboard processing routine and returns to the main routine.

Next, in the main routine, automatic accompaniment processing is performed (step S13). Details of this automatic accompaniment processing are shown in the flowchart of FIG. 7.

In the automatic accompaniment process, it is first checked whether or not the automatic accompaniment flag is "1" (step S5).
0). When it is determined that the automatic accompaniment flag is "0", that is, in the normal performance mode, the process returns from the automatic accompaniment processing routine to the main routine without performing any processing.

On the other hand, when it is determined that the automatic accompaniment flag is "1", that is, the automatic accompaniment mode is set, the contents of the timer counter and the step time included in the automatic accompaniment data read from the automatic accompaniment data storage section 14 are included. The values are compared (step S51), and it is checked whether or not they match (step S52).

When it is determined that they coincide with each other, the data reading unit 32 causes the automatic accompaniment data storage unit 1
The automatic accompaniment data is read from No. 4 (step S53).
If the read automatic accompaniment data is chord part data, it is sent to the chord expanding section 33, if it is bass part data, it is sent to the bass expanding section 34, and if it is drum part data, it is sent to the sound generation channel assigning section 35. .

Then, a code / base expansion process is performed (step S54). In this code / base expansion processing, the code expansion unit 33 expands the code part data received from the data reading unit 32 in accordance with the code sent from the code detection unit 31, or the base expansion unit 34.
Is to expand the base part data received from the data reading section 32 according to the base route sent from the code detecting section 31. Whether to perform chord expansion or bass expansion depends on the read automatic accompaniment data.
If the drum part data is read, the process of step S54 is skipped. This code /
The musical sound data generated by the base expansion processing is sent to the sound generation channel assigning unit 35. When the chord is not established, as described above, the musical tone data is generated based on the pitch data in the keyboard data and the tone length data in the chord part data, and is sent to the sound generation channel assigning unit 35.

Next, a tone generation process is performed (step S
55). That is, the tone data generated by the chord / base expansion is sent to the tone generation channel assigning section 35, so that step S of the keyboard processing routine (FIG. 6) described above is performed.
In the same manner as described in 33, sounding or muting is performed.

Then, the data address is incremented (step S56). That is, the address of the automatic accompaniment data storage unit 14 in which the automatic accompaniment data is stored is incremented. As a result, in the next automatic accompaniment process, the next automatic accompaniment data is used to produce a sound. After that, the routine returns from this automatic accompaniment processing routine and returns to the main routine.

On the other hand, when it is determined in step S52 that the contents of the timer counter and the step time value in the automatic accompaniment data do not match, processing for shifting to the next track (part) is performed ( Step S5
7). That is, when the automatic accompaniment of a plurality of parts is being performed, for example, a process of changing the read address of the automatic accompaniment data is performed in order to perform the same process as described above on the next track (part). . As a result, the processing for the automatic accompaniment data of the chord part, bass part, and drum part is sequentially repeated.

Next, it is checked whether or not the automatic accompaniment has ended (step S58). That is, it is checked whether or not the automatic accompaniment data currently being processed is data having an END mark which means the end of the automatic accompaniment. When it is determined that the automatic accompaniment has not ended, the routine returns from this automatic accompaniment processing routine and returns to the main routine.

On the other hand, if it is determined in step S58 that the automatic accompaniment has ended, automatic accompaniment stop processing and ending processing are performed (step S59). That is,
The automatic accompaniment flag is cleared to "0" and the timer counter stops counting up. After that, the routine returns from this automatic accompaniment processing routine and returns to the main routine.

When the above processing is completed and the routine returns from this automatic accompaniment processing routine to return to the main routine, "other processing" is then performed in the main routine (step S14). In this "other processing", various kinds of processing other than those described above, such as MIDI data transmission / reception processing, are performed.

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

Further, as shown in FIG. 4B, a timer interrupt process is performed separately from the process of the CPU 10. The timer interrupt process is a process of accepting an interrupt generated by the timer of the CPU 10 in a constant cycle and incrementing the timer counter (step S15).
As described above, the contents of the timer counter are used to detect the sounding timing in the automatic accompaniment process.

In order to deepen the understanding of the above operation, FIG. 3 shows the types of pressing patterns and the base route, chord route and chord type detected at that time.

FIG. 3A shows a state in which only the key with the key number A0 is pressed. In this case, since three or more keys have not been pressed on the chord detection keyboard, no chord is detected and the chord is treated as unsuccessful. The lowest note of the key being pressed on the chord detection keyboard, that is, the note name A, is adopted as the bass root.

In FIG. 3B, the key numbers A0 and C # 1 are set.
3 and E1 are pressed. In this case, since three or more keys are pressed on the chord detection keyboard, chord detection is performed. That is, the note name A is detected as the chord root and the major is detected as the chord type. Also,
As the bass root, the lowest note of the key being pressed on the chord detection keyboard, that is, the note name A is adopted.

In FIG. 3C, key numbers C # 1 and E1
And the state where three keys A1 are pressed. In this case, since three or more keys are pressed on the chord detection keyboard, chord detection is not performed and the chord is regarded as unsuccessful. The lowest note of the key being pressed on the chord detection keyboard, that is, the note name C # is adopted as the bass root.

In FIG. 3D, the key numbers C # 1 and E1 are
And the state where three keys A2 are pressed. In this case, since only two keys are pressed on the chord detection keyboard, chord detection is not performed. That is, the note name C # is detected as the chord root, and the major is detected as the chord type.
The lowest note of the key being pressed on the chord detection keyboard, that is, the note name C # is adopted as the bass root.

As described above, according to this embodiment, when three or more keys of the chord detecting keyboard are simultaneously pressed, the success or failure of the chord depending on the pressing pattern and the chord when the chord is established Detect the type (chord root and chord type). Then, when it is detected that the chord is established, a chord sound corresponding to the detected chord is generated. On the other hand, when three or more keys are not pressed at the same time, or when it is detected that the chord is not established, the musical sound generated up to that point is continuously generated.

Further, the base route is detected according to the pressing pattern of the chord detecting keyboard. The bass root detected here is the sound of the key corresponding to the lowest note of the pressed keys. The detection of the base route is performed independently of the success or failure of the code.

Conventionally, chord detection is performed in accordance with the key depression pattern of the keyboard device, and a specific note, for example, the lowest note, among the constituent notes of the detected chord is used as the base route. Therefore, when a specific chord is designated, the bass root is uniquely determined regardless of the pressing pattern, and there is no room for selecting the bass root sound with one chord. On the other hand, according to the present embodiment, for example, when the sound of the key corresponding to the lowest note of the pressed keys is used as the bass root, it is possible to select a plurality of bass root sounds according to the pressing pattern. Become.

As described above, in this embodiment, the chord detecting keyboard for detecting the accompaniment content, that is, the chord and the bass root is predetermined on the keyboard device, and the chord and the bass root are detected. As compared with the case where the chord detection is performed in the entire key range, the performer can easily specify the intended chord. Further, even when the same chord is designated, the bass root can be made different depending on the pressing pattern, so that the performance of fractional chords can be supported.

When the fractional chord is played by sequentially changing the bass tone, the number of keys to be depressed is set to "3" or less, or the chord detection pattern is used in order to detect chords. By pressing a desired key on the keyboard, it becomes possible to apply only the bass sound to the desired sound while continuing the chord sound. As a result, when the chord sound and the bass sound intended by the performer are generated, the keyboard operation is easier than in the case where chord detection is performed in the entire keyboard range.

In the above embodiment, the chord detection is performed on the keyboard data given from the keyboard device 11, and the chord root, chord type and bass root are detected. The chord root, the chord type, and the bass root can be detected by performing the same processing as described above on the keyboard data given via.

Further, in the above-mentioned embodiment, the sound of the key corresponding to the lowest note of the keys pressed on the chord detection keyboard is used as the bass root, but other keys, for example, the highest note, Alternatively, the key sound corresponding to the middle level sound may be used as the bass root.

[0094]

As described in detail above, according to the present invention,
It is possible to provide an accompaniment content detection device and an automatic accompaniment device capable of performing an automatic accompaniment of a fractional chord with a simple key operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an electronic musical instrument to which an accompaniment content detection device of the present invention is applied.

FIG. 2 is a diagram showing an example of a code table used in an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a pressing pattern of a keyboard device and a bass route, a chord route, and a chord type detected at that time in the embodiment of the present invention.

FIG. 4 is a flowchart showing an operation (main routine, timer interrupt processing) of the embodiment of the present invention.

FIG. 5 is a flowchart showing an operation (panel processing) of the embodiment of the present invention.

FIG. 6 is a flowchart showing an operation (keyboard processing and chord detection processing) of the embodiment of the present invention.

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

[Explanation of symbols]

 10 CPU 11 keyboard device 12 operation panel 120 automatic accompaniment switch 13 indicator 14 automatic accompaniment data storage section 15 tone signal generation section 16 amplifier 17 speaker 30 key depression detection section 31 code detection section 32 data reading section 33 code expansion section 34 base expansion Part 35 Sound channel assigner 36 Display controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Takano 200 Terashimacho, Hamamatsu City, Shizuoka Prefecture Kawai Musical Instrument Co., Ltd. (72) Inventor Satoshi Fujimoto 200, Terashima-cho, Hamamatsu-shi, Shizuoka Kawai Musical Instrument Mfg. Co., Ltd.

Claims (4)

[Claims] 1. A keyboard device having a specific area for detecting the accompaniment content, a code detecting means for detecting a chord according to a key pressing pattern in the specific area of the keyboard device, and a specific area of the keyboard device. An accompaniment content detecting device, comprising: a base route detecting means for detecting a base route according to a key pressing pattern. 2. The accompaniment according to claim 1, wherein the bass root detecting means uses a sound of a key corresponding to a lowest pitch among keys pressed in the specific key range as a bass root. Content detection device. 3. A keyboard device having a specific area for detecting the accompaniment content, and when a predetermined number or more of keys in the specific area of the keyboard device are pressed, the success or failure of the chord and the chord according to the pressing pattern. Detecting means for detecting the type of the chord, and a chord sound corresponding to the detected chord when the chord is detected by the chord detecting means, and when the chord is not detected, the previous chord A chord sound generating means for continuously generating a sound, a base route detecting means for detecting a base route according to a key pressing pattern in a specific area of the keyboard device, and a base route detected by the base route detecting means. An automatic accompaniment apparatus comprising: a bass sound generating means for generating a bass sound based on the bass sound. 4. The automatic bass according to claim 3, wherein the bass root detecting means uses a sound of a key corresponding to a lowest pitch among keys pressed in the specific key range as a bass root. Accompaniment device.