JP2619237B2 - Automatic accompaniment device for electronic musical instruments - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chord sound generating device for an electronic musical instrument, and more particularly, to a control pattern in which a sound generation start and a sound generation end based on a keyboard operation are stored in a memory. The present invention relates to an improvement of an automatic accompaniment device of a type controlled according to the following.

[Summary of the Invention] The present invention relates to an automatic accompaniment device of the type described above, in which, for example, when playing a rhythmic chord, a chord name is detected based on key depression information, and a tension note relating to the chord name is included in the key depression information. If the result of the determination is affirmative, the remaining key depression sound obtained by omitting the sound (root tone, fifth note, etc.) to be solved by the tension note is emitted as a chord sound. This makes it possible to obtain more comfortable harmony.

2. Description of the Related Art Conventionally, as an automatic accompaniment apparatus for an electronic musical instrument, there has been known an automatic accompaniment apparatus that enables a so-called rhythmic chord performance by controlling the start and end of a chord sound based on a keyboard operation in accordance with a control pattern stored in a memory. This is known (see, for example, Japanese Patent Application Laid-Open No. 59-199704).

[Problems to be Solved by the Invention] Generally, a chord is based on triads (triads), but adding a tension note to the chords gives a strong sense of tension to the sound and further enhances the harmony. This is because tension notes are always trying to resolve other sounds and are considered to be in an unstable state. When the tension note is pronounced together with the chord component sound, the tone that resolves the tension caused by the addition of the tension note is not pronounced. This is done by the sound that resolves the feeling being pronounced.

However, in the above-described conventional device, all sounds pressed on the keyboard for accompaniment are generated at timings according to the pattern, and the tension code (that is, the tension code (ie,
When a chord including a tension note is played, the tension note and a sound for resolving the tension caused by the addition of the tension note are simultaneously generated, and the harmony is muddy.

One way to eliminate these drawbacks is to avoid pressing the key that corresponds to the tone that the tension note is trying to solve when playing the tension chord, but this requires special attention from the performer. Must be inconvenient.

[Means for Solving the Problems] An object of the present invention is to provide a comfortable harmony without paying special attention by a player when playing a tension chord.

An automatic accompaniment apparatus for an electronic musical instrument according to the present invention comprises: a keyboard [FIG. 1]; and chord specifying means for specifying a chord based on key press information from the keyboard. 24, 6 and 98, and a control pattern for controlling the timing of accompaniment sound generation for each chord type or chord. Storage means [FIG. 1] for storing for each type group; read means for reading from the storage means a corresponding control pattern indicated by the type information according to the type information from the code specifying means [FIG. 46, Fig. 208, Fig. 13 218]
Determining a tension note as a non-harmonic tone to be added to the chord to give a sense of tension, wherein the root note indicated by the root note information based on the root note information from the chord specifying means. A sound whose pitch differs from the sound by a predetermined frequency is determined as the tension note [FIGS.
0, 136, 152, 156], and it is determined whether the tension note determined by the determination means is included in the key press information from the keyboard, and when it is included, a determination is made to transmit a positive output. Means [Fig. 7
8, 132, 138, 154, 158], and if no positive output is sent from the determination means, a chord constituent sound signal corresponding to key depression information based on the key depression from the keyboard is read out from the storage means. Is generated as an accompaniment sound signal in accordance with the control pattern, and when the determination means outputs a positive output, the determination means determines a chord component sound signal corresponding to key depression information based on the key depression of the keyboard. A chord sound signal other than a sound for resolving the tension caused by the added tension note and a tone signal corresponding to the tension note determined by the determining means are generated as an accompaniment sound signal according to the control pattern read from the storage means. Musical tone generating means [Fig.
36, FIG. 9, FIG. 10, and FIG. 13 220 to 240].

[Operation] According to the configuration of the present invention, when a key is depressed, a chord from the depressed key information is specified, the tension note is determined based on the root note information of the specified chord, and the determination means determines the chord. It is determined whether or not the tension note is included in the key press information from the keyboard, and if so, a positive output is transmitted. Then, from the musical sound generating means, a chord constituent sound signal other than the sound for resolving the tension caused by the addition of the tension note according to the determination and a musical sound signal corresponding to the tension note according to the determination are provided in accordance with the control pattern read from the storage means. It is generated as a sound signal, and it is possible to prevent a situation in which the harmony is muddy.

FIG. 1 shows a circuit configuration of an electronic musical instrument having an automatic accompaniment device according to an embodiment of the present invention. In this electronic musical instrument, a melody sound, a manual chord sound, a rhythmic chord sound, and a rhythm sound are provided. And the like are controlled by a microcomputer.

Circuit Configuration (FIG. 1) The upper keyboard (UK) 12, the lower keyboard (LK) 14, the control switches 16, the central processing unit (CPU) 18, the program memory 20, the working memory 22, and the code table 24 , Conversion table 26, pattern memory 28, tempo clock generator
30, a UK tone generator (UK • TG) 32, an LK tone generator (LK • TG) 34, and a code tone generator (CHD • TG) 36 are connected.

Both UK12 and LK14 are manual operation keys. Usually, UK12 is used for melody performance and LK14 is used for chord performance. For the keys of UK12 and LK14, a key code is determined for each key as follows.

Key C ₀ C ^# ₀ … B ₀ C ₁ … C ₂ … C ₃ … C ₄ … C ₅ … C ₆ Key code 24 25… 35 36… 48… 60… 72… 84… 96 It includes various control switches for control and performance control. The embodiment of the present invention also includes a rhythm start switch and a rhythm type selection switch.

The CPU 18 executes a control process for generating various musical tones according to a program stored in a program memory 20 composed of a ROM (Read Only Memory). For details of the control process, refer to FIGS. It will be described later with reference to FIG.

The working memory 22 is a RAM (random access memory).
Memory), and includes a storage area used as a counter, a flag, a register, and the like when the CPU 18 performs various processes. Of these storage areas, those used for chord tone generation control will be described later.

The chord table 24 is composed of a ROM storing root data representing a root note and type data representing a chord type (chord type), and is used for chord detection. The storage contents of the code table 24 will be described later with reference to FIG.

The conversion table 26 is composed of a ROM storing data for converting the sound length to the number of clocks, and the stored contents will be described later with reference to FIG.

The pattern memory 28 is composed of a ROM in which chord patterns for each chord type are stored for each rhythm type, and the storage contents will be described later with reference to FIG.

The tempo clock generator 30 generates a tempo clock pulse, and each tempo clock pulse is used as an interrupt command signal for starting the interrupt routine shown in FIG.

The UK TG32 generates a tone signal (usually a melody signal) based on the operation of the UK12. Also, LK / TG34
Generates a tone signal (usually a manual chord tone signal) based on the operation of the LK14. In addition, CHD / TG3
6 generates a rhythmic chord sound signal based on the operation of the LK 14 and the chord pattern.

In this embodiment, the LK TG 34 has eight sound channels and the CHD TG 36 has five sound channels.
For this reason, up to eight LK depressed sounds can be simultaneously generated by the LK TG 34, and up to five sounds can be simultaneously generated by the CHD TG 36. In general, the LK / TG34 and the CHD / TG36 have different timbres. For example, the LK / TG34 can set a timbre such as a string, and the CHD / TG36 can set a timbre such as a guitar.

Sound system 38 consists of UK TG32, LK TG34 and CHD
・ It is for converting the tone signal from TG36 into sound.

Chord Table (FIG. 2) FIG. 2 shows the stored contents of the chord table 24 in relation to roots and chord types, and the values of root data and type data are shown in hexadecimal notation. Code table
Numeral 24 converts 12-bit address data into 8-bit code name data (4-bit root data and 4-bit type data). When the 12-bit address data from the least significant bit (LSB) and b ₀ ~b ₁₁ sequentially, each bit corresponds to a 12 pitch names, as follows: No key depression at "0" for each bit And "1" indicate that the key is pressed.

Bit b ₁₁ b ₁₀ b ₉ b ₈ b ₇ b ₆ b ₅ b ₄ b ₃ b ₂ b ₁ b ₀ Tone name BA ^# AG ^# GF ^# FED ^# DC ^# C As an example, C-E When the -G key is pressed, the address data becomes "000010010001", and when this is converted by the code table 24, the code name data of "00" is obtained as output data. The code name data represents C _M (C Measuring).

As another example, when the A-G-G key is pressed, the address data becomes "001010000001", and when this is converted by the code table 24, the code name data of "9C" is obtained as output data. This code name data is Am7
(A minor seventh).

Conversion Table (FIG. 3) FIG. 3 shows the storage contents of the conversion table 26 in relation to the value of the tone length data. The tone length data is 4-bit data included in pattern data described later with reference to FIG. 4, and takes any value of 0, 1, 2,... F in hexadecimal notation. Further, the clock number data is represented by the number of the tempo clock pulses described above and the sound length (the length of the sounding period).
It represents.

The tone length data is converted into the corresponding clock number data by the conversion table of FIG. For example, the note length data of "5" is converted to the clock number data of "10", and the "A"
Is converted into clock number data of “28”.

Figure 4 pattern memory (Figure 4) shows the stored contents of the pattern memory 28, this memory code pattern P _C plurality chord type ( "Code not taken" as shown in Figure 2 also A plurality of such chord pattern groups are stored corresponding to a plurality of rhythm types such as march, waltz, and swing, respectively.

Code pattern P _C includes a head data HEAD, first, and third pattern data PATA for the fifth and seventh measure, the second
Alternatively, the pattern data PATB for the sixth measure, the pattern data PATC for the fourth measure, and the pattern data PATC for the eighth measure
It is composed of PATD. Sign "PAT" from PATA to PATD
Is omitted and the pattern progression is shown as "ABACABAD" for the pattern progression for eight measures. The pattern progression for the eight measures is repeated during the performance.

The head data HEAD is 6-byte data. The first 2 bytes indicate the start address of the pattern data PATB, the next 2 bytes indicate the start address of the pattern data PATC, and the remaining 2 bytes indicate the start address of the pattern data PATD. Shown respectively.

As shown in the example of PATC, each pattern data includes event data EVT sequentially arranged, beat end data BE (“00111110”) arranged at the end of each beat, and a tail (at the end of one bar). Measure end data ME ("00
111111 ”).

Each event data EVT is 2-byte data,
The upper four bits of the first byte are sound length data LEN indicating the length of the sounding period, the lower four bits are timing data TIM indicating the sounding timing, the upper two bits of the two bytes are sound volume data indicating the sound volume level, and the remaining six. Bit is unused.

Working Memory Registers Of the working memory 22 registers, the following are used for chord tone generation control.

(1) Rhythm type register RHY This stores rhythm type data indicating the rhythm type (for example, waltz) specified by the rhythm type selection switch.

(2) Rhythm run flag RUN This is a 1-bit register, which is set to "1" when the rhythm start switch is turned on, and is set to "0" when the rhythm start switch is turned off.

(3) Tempo clock counter CLK This is a counter that increases the count value by one each time a tempo clock pulse is generated from the tempo clock generator 30 (that is, each time an interrupt is applied).
It takes a count value of ~ 95, and is reset to 0 at the timing when the count value reaches 96 (end of one bar).

(4) Intra-beat timing register TCL2 This is for sporing intra-beat timing data. The intra-beat timing data is obtained by dividing the counter value of the tempo clock counter CLK by 24 (integer operation). Represents any one of 0 to 23. In this embodiment, one bar has four beats (four beats).

(5) Code timing register TCL This is for storing the code timing data, and the code timing data represents a half (any one of 0 to 11) of the value of the intra-beat timing data. The rhythmic chord sound can be generated at a timing corresponding to the value of the chord timing data, and the timing at which the rhythmic chord sound is generated is determined by the timing data TIM in the event data EVT shown in FIG.

(6) Measure counter BAR This measures the number of measures, takes a count value of 1 to 8, and sets 1 when the count value becomes 9.

(7) code pattern address pointer PNT This is used to read the data of the code pattern P _C.

(8) Length register LENR This is for storing the length data LEN.

(9) Sounding timing register TIMR This is for storing timing data TIM.

(10) Volume register LVR This is for storing the volume data LV.

(11) Clock number register CNR This is for storing the clock number data read from the conversion table 26 in accordance with the sound length data LEN.

(12) Code type register TYP This stores 4-bit type data representing the code type.

(13) Root register ROOT This is for storing 4-bit root data representing the root.

(14) Key code register KC This stores key code data corresponding to a key having an on or off event as 1-bit data indicating an event type (“0” for an on event, “1” for an off event) ) And store it.

(15) LK key code buffers LKCR _{1 to} LKCR ₈ These are registers for eight sounds for storing key code data corresponding to the key pressed by the LK 14.

(16) LK key code registers MINKC _{1 to} MINKC ₈ These are registers for eight tones for storing the key code data of the buffers LKCR _{1 to} LKCR ₈ in order from the lowest tone.

(17) LK note registers MINNT _{1 to} MINNT ₈ These are registers for eight notes for storing note (note name) data corresponding to the key code data of the registers MINKC _{1 to} MINKC ₈ , respectively.

(18) Tension note register TNSb9, TNS9, TNS #
9, TNSb13, TNS13 These registers are for storing the tension note data corresponding to the frequency indicated next to the code "TNS". For example, TNSb9 stores the tension note data corresponding to the minor 9th degree. You.

(19) Fifth note note register FIFTH This is for storing fifth note data, and the fifth note data takes any value from 0 to 11.

(20) Key-off counter KOFCNT This is a counter for setting the clock number data corresponding to the sound length and performing down-counting. The down count is performed every time an interrupt occurs, and the count value is 0.
, The currently sounding sound is stopped.

In the following, various processes for generating a sound will be described with reference to FIGS. 5 to 13, but the calculation formula “a.MOD.b” used for the note name detection process and the like uses the numerical value a as the numerical value b. The remainder is obtained by division (integer operation) or the obtained remainder is represented.

Main Routine (FIG. 5) FIG. 5 shows the processing of the main routine. At step 40, an initialization routine is executed to initialize various registers and the like. For example, the the flag RUN "0", the most significant bit of the buffer LKCR ₁ ~LKCR ₈ (MSB)
"1" (corresponding to key-off) for the counter, 1 for the counter BAR
And 0 for the count CLK.

Next, in step 42, the rhythm start switch (S
It is determined whether there is an event (ON or OFF) in W), and if it is (Y), it is determined in step 44 whether the event is an ON event. As a result, if the event is an ON event (Y), the process proceeds to step 46, where a code pattern corresponding to the rhythm type of the register RHY and the code type of the register TYP is selected, and the start address of the pattern data PATA of this pattern is set to the pointer PNT.
Set to. Then, in step 48, the flag RUN is set to “1”.
Is set.

If it is not an on event (N) in the determination of step 44, it means that it is an off event, and in step 50, the flag RUN is set to "0", and then the process proceeds to step 52. In this step 52, a key-off process is performed to stop the sound of all the sounding channels of the CHD TG 36. And
Move to step 54. The process also moves to step 54 when it is determined in step 42 that there is no event (N) or when the process of step 48 is completed.

In step 54, it is determined whether or not a key event (on or off of a key switch) is performed on either the UK12 or LK14 keyboard. If the result of this determination is that the event is a key event (Y), the process proceeds to the step 58 via the key processing subroutine of step 56, and if there is no key event (N), the process proceeds to step 56
Go to step 58 without going through. The subroutine of step 56 will be described later with reference to FIG.

In step 58, it is determined whether or not there is an event on any switch (SW) other than the rhythm start switch and the key switch. If there is no event (N), the process returns to step 42, and if there is (Y), the process returns to step 42 via step 60.

In step 60, a process corresponding to the switch having the event is performed. For example, when there is a change in the rhythm type or chord type, a chord pattern corresponding to the new rhythm type or chord type is selected, and a pointer is set so that this chord pattern can be read continuously from the previous chord pattern reading stop position. Set the read address in PNT. When a different tone color is selected, a tone color changing process is also performed.

Key Processing Subroutine (FIG. 6) In FIG. 6, step 70 stores key code data corresponding to a key having a key event in a register KC. In this case, "0" is set in the MSB of the register KC for a key-on event, and "1" is set for a key-off event.

Next, at step 72, there was a key event in the UK
It is determined whether the number is 12 or not. If the determination result is affirmative (Y), the process proceeds to step 74. In this step 74, the key processing of UKTG32 is performed. That is, based on the data in the register KC, the corresponding musical tone is emitted if a key-on event occurs, and the corresponding musical tone is stopped if a key-off event occurs. Thereafter, it is determined in step 76 whether there is another key event. If yes (Y), the process returns to step 70. As a result, if a plurality of keys are pressed in the UK 12, a musical tone corresponding to each key can be generated.

If the decision result in the step 72 is negative (N), it means that there is a key event in the LK14, and the step
Move to 78. In this step 78, it is determined whether or not the key event is an ON event. If the key event is an ON event (Y), the process proceeds to step 80.

In step 80, MSB buffer LKCR ₁ ~LKCR ₈ is "1"
It is determined whether there is any (empty). If the result of this determination is affirmative (Y), the flow proceeds to step 82, where the number (any one of 1 to 8) of the empty buffer is set as the control conversion i. Then, the process proceeds to step 84.

In step 84, the data of the register KC is put into the i-th buffer LKCRi. Then, the process proceeds to a step 68, wherein a key-on process for the i-th sound channel of the LK • TG 34 is performed based on the data of the buffer LKCRi. As a result, a tone corresponding to one key pressed by the LK 14 is generated. Thereafter, the process proceeds to step 76, and if there is another key event, the process returns to step 70. Therefore, if a plurality of keys are pressed by the LK 14, a tone corresponding to each key can be generated.

If the determination result of step 80 is negative (N), it means that there is no empty buffer (key-on event data is contained in all eight sounds), and step 76
Move on to Therefore, even if nine or more keys are pressed at the same time with the LK14, only eight tones are actually generated.

If the decision result in the step 78 is negative (N), it means that it is an off event, and the routine goes to a step 88. In this step 88, the MSB of the register KC is reset to “0”. This is to enable key code comparison in the next step 90.

In step 90, Rejisutan buffer LKCR ₁ ~LKCR ₈
It is determined whether the key code matches the KC (whether the sound corresponding to the key code of the KC is sounding). If the result of this determination is negative (N), the flow proceeds to step 76, but if it is positive (Y), the flow proceeds to step 92.

In step 92, the number of the buffer that matches the key code is set as a control variable i. Then, in step 94, "1" is set to the MSB of the i-th buffer LKCRi. This is for restoring the value "0" in step 88. Thereafter, the process proceeds to step 96.

In step 96, L is determined based on the data in the buffer LKCRi.
A key-off process is performed to stop the sounding of the i-th sounding channel of the K · TG. Then, the process proceeds to step 76, and if there is another key event, the process returns to step 70 in the same manner as the above-mentioned key-on event.

If it is determined in step 76 that there is no other key event (N), the process proceeds to step 98. In this step 98,
Based on the data in the buffers LKCR _{1 to} LKCR ₈ , the above-described 12-bit address data for reading the code table is created, and the code table 24 is written in accordance with the address data.
Read the code name data from Then, of the read chord name data, the root data of the upper 4 bits is stored in the register ROOT, and the type data of the lower 4 bits is stored in the register TYP.

Next, at step 100, put the bass data buffer LKCR ₁ ~LKCR ₈ to register MINKC ₁ ~MINKC ₈ are arranged in order. Then, the process proceeds to step 102 to execute a subroutine of the omit process, which will be described below with reference to FIG. After step 102, the process returns to the main routine of FIG.

Subroutine of Omit Process (FIG. 7) In FIG. 7, in step 110, the subroutine of the note process shown in FIG. 8 is executed. Steps in Fig. 8
At 112, 1 is set as the control variable i. And
Proceeds to step 114, register MINKC ₁ MSB of i-th register MINKCi of ～MINKC ₈ is "0" or (or key-on)
judge.

If it is determined in step 114 that MSB = "0" (Y), the process proceeds to step 116. In step 116, a pitch name detection process is performed. That is, the i-th register MINK
The value of Ci remainder by dividing (integer operations) at 12 determined (either 0 to 11), i-th register of the note name data corresponding to the remainder obtained register MINNT ₁ ~MINNT ₈ MINNTi
Store in For example, (corresponding to C ₂ sound) values of MINKCi 48
In this case, 0 (corresponding to note name C) is set in MINNTi as note name data.

If it is determined in step 114 that the MSB is not "0" (N), the process proceeds to step 118, and 12 is set in the register MINNTi. "12" set at this time is C, C ^# ... B
It does not correspond to the 12-note name.

After step 116 or 118, the process proceeds to step 120, where i
1 up. Then, in step 122, it is determined whether i is larger than 8. Initially, since i = 2 in step 120, the determination result in step 122 is negative (N),
Return to step 114.

When the above processing is repeated for eight sounds, step 12
The determination result of 2 is affirmative (Y), and the process returns to the routine of FIG.

Next, in step 124 of FIG. 7, the value of the register TYP is
11 (code type is 7sus4), and if the determination result is affirmative (Y), the routine returns to the routine of FIG. This is because when the chord type is 7sus4, no discordance is generated, so that the omit process is not required.

When the determination result of step 124 is negative (N), the process proceeds to step 126. In step 126, a tension note detection process corresponding to flat nines (b9 degrees) is performed. That is, data obtained by adding 1 to the value of the register ROOT is divided by 12 in the same manner as in step 116, and
The remainder is stored in TNSb9 as pitch name data, the pitch name is detected, and the obtained pitch name data is stored in the register TNSb9. For example, if the value of ROOT is 0 (corresponding to the note name C), (corresponding to the pitch name C ^# or D ^b) 1 as pitch name data in TNSb9 is set. Thereafter, the process proceeds to step 128.

In step 128, it is determined whether there note name register TNSb9 to any register MINNT ₁ ~MINNT _8. If the result of this determination is negative (N), the process moves to step 130, where a tension note corresponding to nine (9 degrees) is detected. That is, data obtained by adding 2 to the value of the register ROOT is calculated in the same manner as in step 116 to detect a pitch name, and the obtained pitch name data is stored in the register TNS9.
For example, if the value of ROOT is 0, 2 (corresponding to note name D) is set in TNS 9 as note name data. Thereafter, the process proceeds to step 132.

In step 132, register MINNT ₁ ~MINNT ₈ to have the pitch name of TNS9 or judgment, proceeds to no (N) if step 134. In this step 134, it is determined whether the value of the register TYP is 8 (the code type is 7th), and if it is not 8 (N), the routine returns to the routine of FIG.

If the decision result in the step 134 is affirmative (Y), the process shifts to a step 136. In this step 136, the sound of the sharp nine (# 9) is obtained based on the data obtained by adding 3 to the value of the resist ROOT. The name is detected, and the obtained note name data is stored in the register TNS # 9. And step 138
Move on to

In step 138, register MINNT ₁ ~MINNT ₈ to have the pitch name of the register TNS # 9 or determined, there (Y) if the procedure proceeds to step 140, a subroutine of root omit shown in Figure 9. Also, when the determination result of step 128 or 132 is affirmative (Y), the root note omit process of step 140 is performed.

In FIG. 9, at step 142, 1 is set as a control variable i. Then, in step 144, is the value of the register MINNTi equal to the value of the register ROOT (root sound)?
The determination is made, and if they are equal (Y), the process proceeds to step 146. In this step 146, “1” (corresponding to key-off) is set to the MSB of the register MNKCi. As a result, it is possible to prohibit the pronunciation of the root note.

When the determination result of step 144 is negative (N) or when the process of step 146 is completed, the process proceeds to step 148, and i is increased by one. Then, it is determined in step 150 whether i is greater than 8, and if not i (N), step 144
And the above processing is repeated until i> 8.

When the determination result of step 150 is affirmative (Y), 8
This means that the sound processing has been completed, and the routine returns to the routine of FIG.

In FIG. 7, when the processing in step 140 is completed or when the determination result in step 138 is negative (N), the process proceeds to step 152. In this step 152, the pitch name of the flat 13th (b13 degree) is detected based on the data obtained by adding 8 to the value of the register ROOT, and the obtained pitch name data is stored in the register TNSb13. Then, the process proceeds to step 154.

In step 154, register MINNT ₁ ~MINNT ₈ to have the pitch name of the register TNSb13 or judgment, proceeds to no (N) if step 156. In this step 156, a thirteenth (13 degrees) based on the data obtained by adding 9 to the value of the register ROOT
And the obtained note name data in the register TNS13.
Store in Then, the process proceeds to step 158.

In step 158, register MINNT ₁ ~MINNT ₈ to have the pitch name of the register TNS13 or determined, the processing returns to the main routine without (N) if Figure 6.

If the determination result in step 154 or 158 is affirmative (Y), the process proceeds to step 160, and the fifth-note omit subroutine shown in FIG. 10 is executed.

In FIG. 10, at step 162, a fifth-degree sound detection process is performed. That is, data obtained by adding 7 to the value of the register ROOT is calculated in the same manner as in step 116 to detect a pitch name, and the obtained pitch name data is stored in the register FIFTH. For example, if the value of ROOT is 0, 7 (corresponding to note name G) is stored in FIFTH as note name data.

Next, at step 164, 1 is set as the control variable i. Then, the process proceeds to step 166, where the register MINNTi is set.
Is determined to be equal to the value of the register FIFTH (5th sound). If the result of this determination is positive (Y), the step
Move to 168, and set “1” to the MSB of the register MINKCi.
As a result, it is possible to prohibit the pronunciation of the fifth sound.

When the processing in step 168 is completed or when the determination result in step 166 is negative (N), i is incremented by 1 in step 170 and then it is determined in step 172 whether i is greater than 8. As a result, if it is not greater than 8 (N), the process returns to step 166, and the above processing is repeated until i> 8.

If the determination result of step 172 is affirmative (Y), 8
This means that the sound processing has been completed, and the routine returns to the routine of FIG.

In FIG. 7, when the fifth-note omit process in step 160 is completed, the routine returns to the routine of FIG.

Specific Example of Omit Process (FIG. 11) According to the above-described omit process, FIG.
As illustrated in (d), it is possible to automatically omit a sound having a predetermined pitch relationship with the tension note.

FIG. 11 (a) shows the code of C Seventh (C-E-G-
This is an example in which the root note C is released when the key is pressed by adding the tension note D of the ninth to the B ^ch (4th chord), and in the processing of FIG. 7, the affirmative judgment (Y) in steps 130 to 132 Corresponds to the flow leading to step 140.

FIG. 11 (b) shows an example in which the fifth note G is emitted when the key is depressed by adding the thirteenth tension note A to the C seventh chord. If the processing of FIG. This corresponds to the flow from step 158 to step 160 after affirmative determination (Y).

Figure 11 (c) is an example in which omit the root C when depressed by adding tension note D ^b flat Ninth to code C Seventh, in terms of the process of Figure 7,
This corresponds to the flow from step 126 to step 140 through the positive determination (Y) in step 128.

Figure 11 (d) are tension note flat Ninth and flat 13th to code C Seventh D ^b and root when depressed by the addition of A ^b C and 5 add-G
7. In the processing of FIG. 7, the process proceeds from step 126 to step 140 via the affirmative determination (Y) in step 128, and further proceeds from step 152 to step 160 via the determination (Y) in step 154. Corresponding to the flow leading to.

Interrupt Routine (FIG. 12) FIG. 12 shows an interrupt routine for enabling the playing of auto rhythm and rhythmic chords. This routine is executed every time a tempo clock pulse is generated from the tempo clock generator 30. It is what is performed.

First, in step 180, it is determined whether the flag RUN is "1" (during rhythm running). If the determination result is negative (N), in step 182, the counter CLK is set to 0 and the counter BAR is set to 1 respectively. Then, the process returns to the main routine of FIG. If the result of the determination is affirmative (Y), the routine proceeds to step 184.

In step 184, rhythm sound generation processing is performed according to the value of the counter CLK, but the description thereof will be omitted.

Next, in step 186, processing of the intra-beat timing set is performed. That is, the remainder (any of 0 to 23) obtained by dividing the value of the counter CLK by 24 (integer operation) is set in the register TCL2. Then, the process proceeds to step 188.

In step 188, a code timing set process is performed. That is, the value of the register TCL2 is multiplied by 1/2 to set the value in the register TCL.

At step 190, a chord sound processing subroutine is executed, which will be described later with reference to FIG.
After step 190, the process moves to step 192.

In step 192, the value of the counter CLK is increased by one.
Then, the process proceeds to step 194, where it is determined whether the value of the counter CLK is 96 (whether the end of one bar). If the result of this determination is negative (N), the flow proceeds to step 196.

In step 196, the intra-beat timing value is obtained by the same calculation as in step 186, and it is determined whether the intra-beat timing value is 0 (end of one beat), and if the determination result is negative (N), the It returns to the main routine of FIG. If the determination result is affirmative (Y), the value of the pointer PNT is incremented by 1 in step 198, and the process returns to the main routine of FIG. By the processing in step 198, it becomes possible to read the event data next to the beat end data BE in the next interrupt.

If the determination result in step 194 is affirmative (Y), the value of the counter CLK is set to 0 in step 200 and then the value of the counter BAR is increased by 1 in step 202. Then, in step 204, it is determined whether the value of BAR is larger than 8 (whether the end of 8 bars). If the result of this determination is affirmative (Y), step
After the value of the counter BAR is set to 1 in 206, the process proceeds to step 208. If the determination result is negative (N), step 20
Go to step 208 without going through 6.

In step 208, any one of the pattern data PATA to PATD is set to the pointer PNT based on the value of the counter BAR. That is, when the value of the counter BAR is 1, 3, 5 or 7, the start address of PATA, when 2 or 6, the start address of PATB, when 4, the start address of PATC, and when 8, the value of PATD Set the start address of each. Thereafter, the process returns to the main routine of FIG.

Subroutine for chord sound processing (FIG. 13) In FIG. 13, at step 210, a counter KOFCNT
Is determined to be 0 (whether the tone length ends). If the determination result is negative (N), the process proceeds to step 212.

In step 212, the value of the counter KOFCNT is decreased by one. Then, the process proceeds to step 214, where it is determined whether the value of the counter KOFCNT is 0 (whether the tone length ends). If the determination result is affirmative (Y), the process proceeds to step 216.

In step 216, a key-off process is performed to stop sounding of all sounding channels of the CHD TG. And
Move to step 218. The process also proceeds to step 218 when the determination result of step 210 is positive (Y) or when the determination result of step 214 is negative (N). This is because the key-off process is not required in these cases.

In step 218, it reads the data of the code pattern P _C on the basis of the address value of the pointer PNT. In this case, for the event data EVT, 2-byte data is read, and the tone length data LEN is stored in the register LENR, the timing data TIM is stored in the register TIMR, and the volume data LV is stored in the register LVR. As for the beat end data BE or the bar end data ME, 1-byte data is read, and the lower 4 bits (“1110” or “1111”) are stored in the register TIMR.

Next, in step 220, it is determined whether or not the value of the register TCL (code timing) matches the value of the register TIMR (whether or not to generate a sound). In this case, the register TIMR
If the value is equal to the value of the register TCL, the determination result is affirmative (Y), and the routine proceeds to step 222. Also, the timing data TIM
Is not equal to the TCL value, or when the lower 4 bits of the beat end data BE or the bar end data ME are stored in the register TIMR, the determination result is negative (N).
And returns to the routine of FIG.

In step 222, the clock number data is read from the conversion table 26 based on the data in the register LENR and stored in the register CNR. Then, in step 224, the value of the register CNR is set in the counter KOFCNT. As a result,
In the interrupt from the next time, down count is enabled in step 212.

Next, at step 226, 1 is set as the control variable i and 1 is set as the control variable j. Then, the process proceeds to step 228, where the MSB of the i-th register MINKCi is set.
Is "0" (key-on), and if it is "0" (Y), the routine goes to step 230.

In step 230, key-on processing of the j-th sounding channel of the CHD TG 36 is performed. That is, by supplying the key code data of the register MINKCi to the j-th sounding channel, the tone corresponding to the key code data is started to sound. The tone volume at this time is
It is controlled according to the volume data LV of the LVR. After step 230, the process moves to step 232.

In step 232, j is increased by one. Then, the process proceeds to step 234, where it is determined whether j is greater than 5. Initially, j becomes 2 in step 232, so the determination result in step 234 is negative (N), and the process proceeds to step 236. The process also proceeds to step 236 when the result of the determination at step 228 is negative (N).

In step 236, i is increased by one. Then, the process proceeds to step 238, where it is determined whether i is greater than 8. Initially, i becomes 2 in step 236, so the determination result in step 238 is negative (N), and the process returns to step 228.

After repeating the processing of steps 234, 236, and 238 four times as described above, the value of j becomes 6 when the processing reaches step 232, so that the determination result of step 234 is positive (Y).
Then, the process proceeds to step 240. As a result, when five or more keys are pressed with the LK 14, sounds for the five keys from the lowest can be generated. If the number of key depressions is a number n (any one of 0 to 4) smaller than 5, step 22 is performed only (8-n) times.
Repeating the processing through 8, 236 and 238, step 238
Is affirmative (Y), and the routine proceeds to step 240.

In step 240, the value of the pointer PNT is incremented by two.
This takes into account that the event data EVT is 2 bytes. After step 240, the process returns to the routine of FIG.

Modifications The present invention is not limited to the above-described embodiments, but can be implemented in various modifications. For example,
The following changes are possible:

(1) In the above-described embodiment, the code detection is also performed for a key release. However, this may be abolished and a memory function for retaining the previous code until a new key is pressed may be added.

(2) In the above embodiment, the data format of the code pattern is the event recording format, but another format may be used.

(3) In the above embodiment, the code pattern (control pattern) is stored for each code type (code type). However, the code type (code type) is divided into a plurality of groups, and each code type group (code type) is stored. A code pattern (control pattern) may be stored for each group. In this case, the capacity of the pattern memory can be reduced. Such a concept is also applicable to chord pattern storage for each rhythm type.

(4) In the above embodiment, the rhythmic code is realized by using a rhythm-related pattern as a control pattern (chord pattern). However, a melodic code or the like can be realized depending on how the control pattern is assembled.

(5) In the above-described embodiment, one bar has four beats (four beats). However, it is a matter of course that the beat can be appropriately changed according to the rhythm type and the like.

[Effects of the Invention] As described above, according to the present invention, among the chord sounds based on the key depression operation, the sound to be solved by the tension note is automatically omitted and the remaining sounds are generated. Therefore, there is an effect that comfortable harmony can be obtained without paying special attention to keyboard operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of an electronic musical instrument provided with an automatic accompaniment device according to an embodiment of the present invention. FIG. 2 is a diagram showing the contents of a chord table in relation to root sounds and chord types and their relations. FIG. 3 is a diagram showing the storage contents of a conversion table in relation to the value of tone length data; FIG. 4 is a diagram showing a data format of a code pattern; FIG. 5 is a flowchart showing a main routine; 6 is a flowchart showing a key processing subroutine, FIG. 7 is a flowchart showing an omit processing subroutine, FIG. 8 is a flowchart showing a note processing subroutine, and FIG. 9 is a root note omit subroutine. Flowchart, FIG. 10 is a flowchart showing a subroutine of fifth-note omit, and FIG. 11 is a staff showing a specific example of the omit process. , FIG. 12 is a flowchart showing an interrupt routine, FIG. 13 is a flowchart showing a subroutine of chord sound processing. 10 ... bus, 14 ... lower keyboard, 18 ... central processing unit, 20 ...
… Program memory, 22 …… Working memory, 24 ……
Code table, 26 conversion table, 28 pattern memory, 30 tempo clock generator, 36 code tone generator, 38 sound system.

Claims (1)

(57) [Claims] 1. A chord specifying means for specifying a chord based on a keyboard and key depression information from the keyboard, wherein chord specifying means specifies a root note of the specified chord and a type of the specified chord. Storage means for transmitting a type information and a control pattern for controlling accompaniment sound generation timing for each chord type or chord type group; and the type information according to the type information from the chord identification means. Reading means for reading the corresponding control pattern indicated by the above from the storage means; and determining means for determining a tension note as a non-harmonic sound added to the chord to give a sense of tension; Determining a sound having a pitch different from the root indicated by the root information by a predetermined frequency based on the root information of the tension note as the tension note; A determination means for determining whether or not the input tension note is included in the key press information from the keyboard, and transmitting a positive output when the tension note is included; and a positive output when the determination means does not output a positive output. When a chord constituent sound signal corresponding to key depression information based on a key depression from the keyboard is generated as an accompaniment sound signal according to the control pattern read from the storage means, and a positive output is sent from the determination means, In the chord constituent sound signal corresponding to the key depression information based on the chord key depression from the keyboard, the chord constituent sound signal other than the sound for resolving the tension due to the addition of the tension note determined by the determining means and the determining means Means for generating a tone signal corresponding to the determined tension note as an accompaniment tone signal in accordance with the control pattern read from the storage means. Automatic accompaniment apparatus for an electronic musical instrument which is characterized in that there was example.