JPH0631982B2 - Automatic rhythm accompaniment device - Google Patents

Description

The present invention relates to an automatic rhythm accompaniment device capable of performing ad lib rhythm performance.

[Prior art and its problems]

In the conventional rhythm accompaniment device, the output rhythm sound is repeatedly emitted according to the selected single rhythm pattern. was there. For this reason, for example, in a rhythm box or the like, a sound based on an ad lib rhythm pattern has been developed automatically instead of a rhythm sound based on a steady rhythm pattern every 4 or 8 measures. There is. However, also in this case, the rhythm sound based on the same ad-lib rhythm pattern is always output repeatedly every four measures or every eight measures, so that monotonicity is still undeniable.

[Object of the Invention]

The present invention has been made in view of the above-mentioned drawbacks, and stores control information for performing an adlibrhythm performance for a predetermined period in association with chord progression, and allows the adlibrhythm performance to be performed at an arbitrary progression position of the music. It is an object of the present invention to provide an automatic rhythm accompaniment device that allows a player to input this ad lib rhythm pattern.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows an electronic organ equipped with the automatic rhythm accompaniment apparatus of this embodiment. As shown in the drawing, the electronic organ 1 is composed of support legs 2 and 2 and a body 3 supported by these support legs 2 and 2. A keyboard 4, a first operation section 5, a second operation section 6, a speaker 7, and a music stand 8 are provided on the machine body 3, and the electronic circuit shown in FIG. 3 is provided in the machine body 3. The keyboard 4 has 50 keys with pitches B _{1 to} C ₆ and is used for normal performance. Further, a power switch 9, a volume switch 10 and the like are arranged on the first operation section 5, and further various switches described in detail with reference to FIG. 2 are provided on the second operation section 6. A tempo lamp 11 is provided on the music stand 8 and is turned on at the start of each bar so that the tempo can be confirmed.

Next, the configuration of the second operation unit 6 will be described with reference to FIG. The ad libset switch 12 is a chord (chord) shown in FIG.
This is a switch operated when the rhythm pattern number for adlib rhythm performance is stored in the progress storage RAM (random access memory) 31 together with chord information indicating the chord progression state (chord progression state). In this case, eight kinds of programmable rhythms (programmable rhythms 1 to 8) can be used for the rhythm pattern for playing the ad-lib rhythm (hereinafter referred to as ad-lib rhythm), and the rhythm is stored in the programmable rhythm memory RAM 30 shown in FIG. It is stored with the instrument name. Thus, the programmable rhythm is a rhythm pattern that the player himself can arbitrarily specify and write. On the other hand, the ad libset switch 13 is the third
In order to use the rhythm pattern stored in the preset rhythm storage ROM 29 as an ad-lib rhythm, an operation is performed when the rhythm pattern number is stored in the chord progression storage RAM 31 together with chord information indicating the chord progression state. It is a switch to do. In this case, eight kinds of preset rhythm patterns (referred to as preset rhythms) (preset rhythms A to H) are prepared and stored in the preset rhythm storage ROM 29 together with rhythm instrument names.

The programmable rhythm selection switch (hereinafter, simply referred to as a selection switch) 14 includes the programmable rhythms 1 to 1 described above.
A switch for designating any one of the eight. The preset rhythm selection switch (hereinafter, simply referred to as a selection switch) 15 is a switch for designating any one of the preset rhythms A to H. Further, a rhythm instrument sound selection switch (hereinafter, simply referred to as a selection switch) 16 is a rhythm instrument sound source selection switch, and is a switch for designating any one of the rhythm instrument sound sources a to h. In this case, the rhythm musical instrument sound sources a to h are associated with the sound sources of the rhythm musical instruments such as bass drum, snare drum, hi-hat, maracas, bongo, and cymbal, respectively.

The code set switch 17 is a RAM 3 for storing chord progressions.
This is a switch used when writing the above chord information on 1. In this case, each chord (chord) information is specified by the key operation on the keyboard 4, but each chord (major, minor, sevens, diminish, etc.) of each kind for the note names C, C, ... For example, 6-bit data is input. The program tempo / variation switch 18 is used for setting the rhythm pattern (timing) for the rhythm musical instrument sound source selected at that time in the rhythm write mode described later, while it is constantly played in the play mode described later. It is a switch used to insert an arbitrary variation rhythm into the rhythm pattern being played and to perform rhythm performance.

The start / stop switch 19 is a switch which is used in the play mode or the rhythm write mode and controls the rhythm start (rhythm stop) or the rhythm writing start (rhythm writing stop), respectively. The start / stop switch 19 is composed of a reversing switch and is fixed to either the start side or the stop side for each operation.

The tempo volume switch 20 is a switch for changing the tempo at the time of playing or writing a rhythm, the playing speed changes according to the setting state of the switch 20, and the lighting interval of the tempo lamp 11 also changes. . The channel selection switch 21 designates any one of the four channels assigned to each switch of the programmable rhythm selection switch 14, that is, the same programmable selection switch has a maximum of four types. The musical instrument sound source rhythm can be designated and written in the programmable rhythm storage RAM 30.

The variation control switch 22 is a switch for designating whether to insert a variation rhythm pattern for each measure, for each second measure, etc., when the program tempo / variation switch 18 is operated in the play mode. That is, as shown in the figure, "1", "2", "4", "8", "16", "3"
There are 7 kinds of switching positions weighted to "2" and "64" respectively, and variations are made for each measure, every 2 measures, every 4 measures, ..., once for every 64 measures. A rhythm pattern is inserted.

The mode switch 23 is a switch for designating any one of the chord write mode, the rhythm write mode, and the play mode. The chord write mode is a mode for writing and specifying chord information.

Next, the circuit configuration of the main part will be described with reference to FIG. The central processing unit (hereinafter, referred to as CPU) 25 includes a control unit 26, a calculation unit 27, a register unit 28, and the like. Control unit 2
6 stores a control program for controlling various operations of this electronic organ. The calculation unit 27 executes various calculations based on the input data from the control unit 26 or the register unit 28, and enables execution of the above-mentioned three types of modes. Further, as shown in the figure, PS
Registers, CS registers, GS registers, OS registers, VFLAG registers, VC registers, M1 registers, M2 registers, M3 registers, CNT registers and the like are provided. The PS register, the CS register, and the GS register are each a RAM 30 for programmable rhythm storage.
The adlibrhythm number, channel,
This is a register for temporarily storing each data of the rhythm musical instrument sound source. The OS register is a register for temporarily storing the preset rhythm number stored in the preset rhythm storage ROM 29. Further, the VFLAG register is a register for storing a variation flag. Therefore, when the program tempo / variation switch 18 is turned on in the play mode, a binary logic level "1" is written, and when it is turned off. "0" is written. The VC register is a register used as a down counter in the play mode, and its initial value is the seventh value depending on the setting position (switching position) of the variation control switch 22 "1", "2", ..., "64".
7-bit data shown in the figure (“1” in decimal notation,
"2", ..., "64") are set respectively. The M1 register and the M2 register are respectively the RAM 30 or the RO.
Data giving rhythm patterns read from M29 (data in which one bar is represented by 8-bit data)
Is a register for temporarily storing. Further, the M3 register is a register for temporarily storing the data giving the rhythm pattern of the ad lib rhythm read from the ROM 29 or the RAM 30. In addition, M1 register, M2 register, M
Each of the 3 registers has a capacity of 4 channels. The CNT register is a register used as a counter in the rhythm write mode, and the data which finally gives the rhythm pattern of the ad lib rhythm is written in this CNT register, and then the above data is transferred to the designated area of the RAM 30. .

CPU 25 and the above-mentioned ROM 29, RAM 30, RAM 31
Are connected to each other by a data bus and an address bus shown in FIG.
Addresses 0 and 31 are addressed to the CPU 25 to write and read data. Thus RO
The rhythm pattern data read from the M29 or the RAM 30 is latched by the latch circuit 32 and the rhythm tone generator circuit 3
Given to 3. The latch operation of the latch circuit 32 is controlled by the timing signal BUSYA output from the oscillator circuit 34. This timing signal BUSYA is a signal generated in a cycle with a time corresponding to the length of an eighth note (♪) as a reference. Then, the rhythm sound source 33 which has received the rhythm pattern data latched in the latch circuit 32 generates a corresponding rhythm sound source signal (including up to four kinds of rhythm instrument sound source signals) and sends it to the speaker 7.

On the other hand, the chord information read from the RAM 31 on a bar-by-bar basis is latched by a latch circuit 35 and a musical tone creating section (not shown).
Transferred to. The latch operation of the latch circuit 35 is controlled by the timing signal BUSYB generated from the oscillation circuit 34 in a cycle based on the time corresponding to the length of one bar based on the tempo set at that time. . In addition, the above-mentioned musical tone creating section is provided with a latch circuit 35.
A chord is created based on the chord information latched in and is sent to the speaker 7.

Further, a key operation signal output from the keyboard 4 is given to the CPU 25 via a data bus shown in the figure. So CPU2
At this time, the reference numeral 5 processes the key operation signal to determine the pitch, tone length, volume, etc. of the operation key, and sends the processed signal to the tone creating section to produce a corresponding tone.

The data area of the programmable rhythm storage RAM 30 is defined as shown in FIG. That is, the data area of the RAM 30 is first divided into eight corresponding to each of the eight types of rhythms. Thus, if the area divided into eight is called a PS area, the PS area has
The number 8 is attached. Further, each PS area is further divided into four and is associated with the above-mentioned four channels. Now, when the area divided into four is referred to as a CS area, the CS areas are numbered 1 to 4, respectively. In this way, the RAM 30 can be addressed by the contents of the PS area and the CS area. Then, data indicating a rhythm instrument name and rhythm pattern data are written and stored in each channel of each type of rhythm. The structure of the data area of the preset rhythm storage ROM 29 is the same as that of the RAM 30.

The structure of the data area of the chord progression storage RAM 31 is as shown in FIG. That is, the chord information indicating the chord (chord) progress state is stored, for example, in units of one bar, but in this embodiment, the number of the adlib rhythm is stored in the RAM 31 together with the chord progression. Therefore, as shown in FIG. 6, the data area of each measure is divided into an adlib flag storage area (AFLAG), an adlibrhythm number storage area, and a chord storage area. In the ad-lib flag storage area, "1" is written when the ad-lib rhythm is stored and "0" is written when the ad-lib rhythm is not stored. Further, the number of the rhythm pattern stored in the ROM 29 or the RAM 30 (for example, the contents of the PS area shown in FIG. 5) is written in the ad-lib rhythm storage area. Further, chord information is written in the chord storage area.

Next, a configuration relating to detection of each switch on the second operation unit 6 and detection of each key on the keyboard 4 will be described. The above-mentioned switches 22, 14, 16, 21, and 15 on the second operation unit 6 have a matrix configuration of 5 rows and 8 columns, respectively. And C
Signals KI0 to KI4 obtained by decoding the address data output from the PU 25 by the address decoder 36 are applied as row input signals to the switches 22, 14, 16, 21, and 15, respectively, and ON / OFF states of the switches are detected. . The on / off detection signals are output to the data bus as column output signals KO1 to KO8, and C
It is configured to be provided to the PU 25. FIG. 4A shows row input signals KI0 to KI4 and column output signals KO1 to KO for the switches 22, 14, 16, 21, and 15.
8 shows the relationship with 8. That is, in FIG. 4A, for example, when only the row input signal KI0 is output as "1", the setting state of the variation control switch 22 is detected, and if it is set to the switching position "4", for example. The content is "00100000" (KO1, KO2
The column output signals KO1 to KO7 are output as 7-bit data (in the order of KO8). The column output signal KO8 of the 8th bit is fixed at "0" and is treated as invalid data. In FIG. 4A, the invalid data of the variation control switch 22 is shown by diagonal lines, but the invalid data of the channel selection switch 21 is also the same. Further, the row input signals KI0 to KI4 (KIn,
n = 0 to 4) and column output signals KO1 to KO8 (KOm, m
= 1 to 8).

On the other hand, the switch group 37 including the switches 12, 13, 17, 19, and 23 also has a predetermined matrix configuration,
The ON / OFF state is detected by the signal D1 obtained by decoding the predetermined address data output from the address decoder 36 by the address decoder 36, and the detection result is the CPU 25.
To the data bus. Further, each key on the keyboard 4 has a matrix structure, and the address decoder 36
The ON / OFF state of each key is detected by the signal D2 similarly output from the above.

As shown in FIG. 3, the tempo volume switch 2
The signal output from 0 is given to the oscillation circuit 34, and the timing signals BUSYA and BUSYB are created.
Further, the timing signals BUSYA and BUSYB and the output (interrupt signal) of the program tempo / variation switch 18 are both given to the CPU 25. Further, the CPU 25 outputs a synchronization signal SYNC at the start of each bar so that the circuits are synchronized with each other.

Next, each operation of the rhythm light mode and the play mode will be described with reference to FIGS. Although the details of the operation of writing the chord information and the adlib rhythm number to the chord progression storage RAM 31 are omitted, in the case of this chord write mode, the mode switch 23 is first switched to the chord write mode position, and then the start / start / After turning on the stop switch 19, a predetermined key on the keyboard 4, the chord set switch 17 and the ad libset switches 12 and 13 are respectively operated to sequentially write and write chord information and ad librhythm numbers in units of one bar. After that, the start / stop switch 19 is turned off.

First, the operation of the rhythm write mode will be described with reference to FIGS. 5, 8 and 10. In this case, the mode switch 23 is set to the rhythm light position. Further, the programmable rhythm selection switch 14, the channel selection switch 21, and the rhythm instrument sound selection switch 16 are set to desired positions, respectively. For example, the switch 14 is set to "1" and the rhythm number to be written in the RAM 30 is made to correspond to "1". The switch 21 is switched to "1" to designate the first channel, the switch 16 is switched to "a", and the rhythm instrument sound source is designated to be a bass drum.

When the switches 14, 21, and 16 are set to the above-mentioned states, when the rhythm light mode starts, first,
The processes of S ₁ , S ₂ , S ₃ , and S ₄ are repeatedly executed until the start / stop switch 19 is turned on. With mushrooms
In the process S ₁ , the row input signal KI1 to the switch 14
Is output as "1", the address data is CP
The signal is output from U25 to the address bus and given to the address decoder 36. Therefore, the row input signal K of "1" above
The on / off state of the switch 14 is detected by I1. Since the switch 14 is set to "1" now, 8-bit data "10000000" is output to the column output signal KO1.
~ KO8, and CPU2 via the data bus
Sent to 5. The CPU 25 uses the above data “100000
00 "to write the data" 1 "(decimal number) indicating the programmable rhythm number" 1 "in the PS register.
Further, in the process S ₂ , the row input signal KI3 of “1” is similarly obtained.
Is output from the address decoder 36, whereby the on / off state of the switch 21 is detected. Since the switch 21 is set to "1" now, 4-bit data "1000" is output as the column output signals KO1 to KO4 and is given to the CPU 25. The CPU 25 processes the data "1000" and writes the data "1" (decimal number: channel number) indicating the first channel in the CS register. Further output line input signal KI2 processing in S ₃ "1", the on-off state of the switch 16 is detected similarly. Switch 16 is currently being set to "a", so 8
Bit data “10000000” is the column output signal KO
It is output as 1 to KO8 and given to the CPU 25.
Therefore, the CPU 25 processes the above data and writes the data "1" (decimal number) indicating the rhythm musical instrument sound source name of the bass drum into the GS register. Then it is determined whether or not the start / stop switch 19 in step S ₄ is turned ON, the process further described above if it is not turned on S ₁ ~
S ₃ is repeated. In this case, unless the setting states of the switches 14, 21, 16 are changed until the start / stop switch 19 is turned on, the data in the respective registers of PS, CS, GS cannot be rewritten as the above data.

Then start the / stop switch 19 is turned on this ON state is detected by the signal D1 output periodically, steps S _5, S ₆ is executed. In茲, its content is "00000000" as shown in FIG. 10 1 At step _{S 5} First CNT register is cleared.
The synchronization signal SY from the CPU25 at step _{S 5}
NC is output, the circuits are synchronized with each other, and the tempo lamp 11 starts lighting, so that the start of the first bar can be visually confirmed. On the other hand, along with this, from the oscillation circuit 34,
Tempo volume switch 20 set at that time
Timing signal B at time intervals according to the set tempo
USYA and BUSYB are output. Therefore, the tempo lamp 11 displays the tempo at a cycle according to the timing signal BUSYB.

Now, enter the rhythm of the ad-lib rhythm to be input in 1 / 8th notes.
It is possible to input every beat. Thus was 1 beats following the step _{S 6,} the words, once at a time interval timing signal BUSYA is output, the step _{S 7, S} 8, S
₉ is executed, and when the program tempo / variation switch 18 is turned on during the execution of step S ₇ , the interrupt process S ₁₀ is executed. That is, whether the step S ₇ in timing signal BUSYA is output, whether one beat has passed determination is performed in other words. Step S ₈ if one beat is passed is started, the contents of the CNT register is one bit left shift. Next step whether the S ₉ timing signal BUSYB is output, in other words 1 whether bars has passed judgment is executed. On the other hand, processing of +1 the CNT register only when the switch 18 in the process S ₁₀ is turned on is executed.

As described above, in this case, since the rhythm is input every other beat, the tempo lamp 11 is turned on after the start / stop switch 19 is turned on, the switch 18 is turned on at the same time, and the interrupt signal is given to the CPU 25. After on this for the start / stop switch 19, the interrupt processing S ₁₀ during execution of the first beat of the step S ₇ that was started is executed, so that the contents of the CNT register shown in FIG. 10 2 are +1 " 00000001 ".
Next, at step S ₈ the one beat has elapsed is performed, CN
The above contents of the T register are shifted left by 1 bit and
Next to "00000010" as shown in FIG. 3, is provided for the execution of the second beat of the interrupt processing S _10. Then returns to step S ₇ through step S _9, 2 beat the process is started. The switch 18 is not turned on for the second beat. Therefore, steps S ₇ , S ₈ and S ₉ are continuously executed, and the interrupt process S ₁₀ is not executed. Therefore, after the end of the processing of the second beat, the content of the CNT register is "00000.
It is 100 ". When the processing of the third beat is started, the switch 18 is turned on at the third beat. Therefore, the interrupt process S ₁₀ is executed and the CNT register is incremented by 1, and the content is "000001" as shown in FIG.
01 ”. Then the contents of the CNT register the third beat of the process _{S 8} is provided on the fourth beat process further becomes "00001010".

The operation of step S ₇ to S ₉ and processing S ₁₀ by the ON operation and the on operation of the switch 18 described above is performed for further 4 beat 8 beat, the result first measure has elapsed, the timing signal When BUSYB is output step S ₁₁ is started. By the operation of the first measure described above, the rhythm pattern data of the rhythm input every other beat is stored in the CNT register as "101" as shown in FIG.
"01010" is stored. In step S _11, when the RAM30 registers addressed by the contents of the current PS registers and the CS register is referred to as MS register, whether the contents of this MS register matches the contents of the GS register and CNT register the above The determination process of is executed. Of course, at this point, MS
The contents of the register GS registers do not match the contents of the CNT register, then step S ₁₂ is executed,
Each data in GS register and CNT register is RAM3
0 to MS register. In the present case, therefore, the contents of the GS register and the CNT register are written in the areas of PS = 1 and CS = 1 shown in FIG. As a result, P
The content data “1” (decimal number) of the S register and the content data “10101010” (binary number) of the CS register are written. Next, returning to step S ₅ , the CNT register is cleared, and at step S ₆ , the synchronization signal SY
NC occurs, the tempo lamp 11 is turned on, and the start of the second bar is notified. In the case of this embodiment, exactly the same operation as the first measure described above is executed as a confirmation operation. Therefore the operation of turning on the switch 18 to one beat every is restarted, and step S ₇ to S described above
₉ , processing S ₁₀ is executed similarly. When the above confirmation operation is completed and the timing signal BUSYB is generated, the second step S ₁₁ is executed. In this case, if the confirmation operation is performed exactly as in the first measure, in step S ₁₁ , the MS in the RAM 30 is processed in the previous (first measure) process.
Since the contents of the GS register and the CNT register have been transferred to and stored in the register, this time, a match between the contents of the MS register and the contents of the GS register and the CNT register is detected. Therefore, the process S ₁₃ is started, and the data is read from the MS register and given to the latch circuit 32. Therefore, the rhythm sound source 33 generates a signal of the above-mentioned rhythm pattern for the bass drum and causes the speaker 7 to emit a sound, whereby the input ad lib rhythm can be confirmed by the ear. Also after execution of the processing S ₁₃ then start / stop switch 19 is in the standby state until it is turned off. When the start / stop switch 19 is turned off, all the above-mentioned operations and operations are completed. Then, in preparation for the next rhythm input, the processes S _{1 to} S ₃ are continuously executed, and the start / stop switch 19 is turned on again to input the next programmable rhythm. 8 is stored in the RAM 30 by the above operation.
Rhythms of various types can be set for each of the four rhythm musical instruments at maximum.

Next, the operation of the play mode will be described with reference to FIGS. 6 and 9. In this play mode, while performing the electronic organ performance (melody performance) by operating the keys of the keyboard 4, the automatic rhythm accompaniment and ad lib rhythm accompaniment according to the information read from the RAM 31 for storing chord progression, and further during this automatic rhythm accompaniment. By manually operating the program tempo / variation switch 18, a rhythm pattern can be directly specified and read from the ROM 29 or the RAM 30 in place of the rhythm accompaniment, and an automatic rhythm performance by this variation rhythm can be executed. In the following description of the operation of the play mode, the description of the operation related to the melody performance of the electronic organ is omitted.

First, the mode switch 23 is set to the play mode position. Next, when starting the automatic rhythm accompaniment, the start / stop switch 19 is turned on (step P ₁ ). Then the synchronization signal SYNC from the CPU25 due to step P ₂ is output, the tempo lamp 11 starts lighting, thereafter, blink at a tempo corresponding to the setting state of the tempo volume switch 20, also corresponding timing signals B
USYA and BUSYB are output from the oscillation circuit 34.
Next, the row input signal K is first processed by the processes P ₃ and P _4.
I1 is output, and the on / off state of the switch 14 is detected. Then, the detection result is once input to the PS register, and then the RAM 30 addressed based on the data.
The contents of the register are transferred to the register. As a result,
Variation rhythm information is written in the M1 register. Next, the processes P ₅ and P ₆ are executed, and the row input signal KI4
Is output to detect the on / off state of the switch 15, and after the detection result is once input to the OS register, the ROM 29 is addressed based on the data and the corresponding data is transferred and stored in the M2 register. As a result, the M2 register has R for playing a normal rhythm.
The data read from the OM 29 is written.

Following the above process P ₆ , step P ₇ is then executed. The process P ₇ In VFLAG registers whether the content is "1" or, in other words the switch 18 whether variation rhythm performance is turned on is requested or not. Normally, a steady rhythm accompaniment is executed by the information read from the ROM 29, so that after the execution of step P ₇ , the step P ₈ is executed and whether or not the content of AFLAG read from the RAM 31 is “1”, that is, , RAM31
It is determined whether or not the rhythm performance of the ad lib rhythm is designated by. In this case, the content of AFLAG is "0"
Therefore, since the rhythm performance by the ad lib rhythm is not designated, the process P ₉ is executed next to execute the steady rhythm accompaniment, and the rhythm pattern data in the M2 register and the chord information read from the RAM 31 are respectively obtained. The data is output and applied to the latch circuits 32 and 35, respectively, and then applied to the rhythm sound source 33 or the musical sound creating section. As a result, the rhythm according to the rhythm pattern (read from the ROM 29) of the steady performance specified by the preset rhythm selection switch 15 and the automatic accompaniment with the specified chord are executed. Then, the process P ₁₀ is executed subsequent to the process P ₉ , whereby the above-mentioned automatic accompaniment is executed for one bar. During this period, the contents of the latch circuit 32 are sequentially changed according to the output of the timing signal BUSYA, and the rhythm sound is output.

On the other hand, because if AFLAG by processing P ₈ is detected to be "1" is the request of a rhythm performance by ad lib rhythm has been stored with the chord progression in RAM 31, then the process P _11, P ₁₂ is Executed, RA
R based on the adlib rhythm number read from M31
The designated ad-librism data in the OM 29 or RAM 30 is transferred to the M3 register and then given to the latch circuit 32. Further, at that time, the chord information simultaneously read from the RAM 31 is given to the latch circuit 35. As a result, when the RAM 31 is designated to perform adlibrhythm performance along with chord progression, the designated adlibrhythm is read from the ROM 29 or the RAM 30 and accompanied by the chord information at that time.

As described above, the processes P ₇ , P ₈ , P ₉ , and P ₁₀ are rhythm accompaniment processes for steady performance, and when the process P ₁₀ finishes the rhythm accompaniment of one measure, the process returns to the process P ₁ and the above processes are performed. The rhythm accompaniment for the next bar is prepared by each processing operation of P _{1 to} P ₆ . In addition, the processing P ₇ , P ₈ ,
P _11, P _12, P ₁₀ is the ad-lib rhythm accompaniment process by specifying the RAM 31, if improvisation rhythm accompaniment of one bar by the process P ₁₀ is you're done, then returns to the process _{P 1,} also the process _P 1 ~ Similarly, the rhythm accompaniment for the next bar is prepared by P ₆ .

On the other hand, during the above-mentioned automatic rhythm accompaniment, when the player turns on the switch 18 to instruct the variation rhythm performance, the interruption processing of P ₁₃ , P ₁₄ , and P ₁₅ is executed. VFLA because I'm currently playing the usual automatic rhythm
The content of the G register is "0", so the switch 1
A flag "1" indicating that 8 is turned on is written in the VFLAG register. At the same time, the contents of the VC register are cleared. Then, return to the original flow, followed end automatic rhythm accompaniment of the measure, further processing P ₁ when through to P ₆ reaches step P ₇ above interrupt processing result, VFLA
The contents of G is detected to be "1", the process P ₁₇ is executed next after the step P _16. In this process P ₁₇ , M
The content of the 1 register is output, and the rhythm pattern information of the programmable rhythm designated by the switch 14 is latched in the latch circuit 32. The chord information of this bar read from the RAM 31 is latched by the latch circuit 35 and output. Subsequently, the process P ₁₈ is executed, the row input signal KI0 is output, the setting state of the variation control switch 22 is detected, and the result is VC.
It is set in the register. That is, in the VC register, data indicating how many variations the above-mentioned variation rhythm (programmable rhythm) is given to the rhythm of steady performance (data indicating variation), for example, "4" (in binary number, "0000100"). : See Fig. 7)
Is written. The data "4" indicates that the above-mentioned ad librhythm is given once every four measures. Next, when the step S ₁₀ is rhythm performance by the ad-lib rhythm that is performed between one bar is detected, and returns to the process P _1, enters the next bar. In the same manner, after the processes P _{1 to} P ₆ are performed and when the process reaches step P ₁₆ after the execution of step P ₇ , the data in the VC register is not “0” now, so step P ₁₉ is executed next and VC is executed. The content of the register is decremented by 1 and becomes "3". Then, the process goes to Step P ₈ through Step P ₂₀ . As described above, this step P ₈
Then, it is determined whether or not there is a designation of the ad-lib rhythm performance by the RAM 31 in this measure. If there is no designation, the process proceeds to P ₉ , and if there is no designation of the switch 15, the process proceeds to P ₉ and the result switch 15 The specified performance rhythm is played together with the chord, while if the adlib rhythm performance is specified, the rhythm based on the adlib rhythm information read from the ROM 29 or RAM 31 according to the instruction of the data read from the RAM 31 is played along with the chord. To be done. In this way, when the rhythm performance by the process P ₉ or the rhythm performance by the processes P ₁₁ , P ₁₂ is executed for one bar, the process returns to the step P ₁ through the step P ₁₀ . Thus, the above-mentioned processes P _{1 to} P ₇ , P ₁₆ , P ₁₉ , P
₂₀ , P ₈ , P ₉ , P ₁₀ or treatments P _{1 to} P ₇ , P ₁₆ , P
Each processing of ₁₉ , P ₂₀ , P ₈ , P ₁₁ , P ₁₂ , and P ₁₀ is executed twice more until the content of the VC register becomes "0", and the rhythm performance not depending on the variation rhythm is further executed by two measures. It Then, in the next bar, the variation rhythm accompaniment by the variation rhythm is executed again in the same manner as described above, and then the steady rhythm accompaniment or the adlib rhythm accompaniment is executed for 3 bars. In this way, if the switch 22 is set to "4", one in every four measures
A variation rhythm performance is executed one by one. Then, when it is desired to stop the rhythm performance in which the variation rhythm enters every predetermined measure and return to the regular performance, the switch 18 is operated. As a result, the interrupt processing is executed, it is executed in step P ₂₁ through step P _13, as a result, the contents of VFLAG register is cleared. For this reason, the routine will resume from the next measure.

When the start / stop switch 19 is turned off to stop the rhythm accompaniment made in this way,
At the start of the next bar, this off state is detected by step P ₁ , then step P ₂₂ is executed, the latch circuits 32 and 35 are both cleared, the rhythm sound and accompaniment sound are stopped, and the automatic rhythm accompaniment is stopped. To do.

It should be noted that the ad-librism performance is executed for one bar in the above embodiment, but this can be changed for a period of two bars, for example.

Further, in the above-described embodiment, the chord information and the control information for executing the adlib rhythm performance are written in the RAM 31 in the form as shown in FIG. 6 for each bar. It is not limited.

In addition, although the present invention is applied to the electronic organ in the above-described embodiment, the present apparatus can be made as a single unit, and in that case, as a means for writing chord information, an input having a plurality of push button switches for each chord is input. The device may be used, and the speaker, the sound source circuit, and the like may be the ones provided in the connected electronic organ and the like, and may be variously modified without departing from the scope of the present invention. ,
Of course, it can be applied.

〔The invention's effect〕

As described in detail above, according to the present invention, the adlib rhythm pattern is read in place of the steady rhythm pattern to perform the ad lib rhythm performance during the period specified by the player during the chord progression of the music. Since the pattern can be written by the performer, there is an advantage that the musical effect is increased and a variety of automatic rhythm accompaniment can be performed.

[Brief description of drawings]

FIG. 1 is an external perspective view of the electronic organ according to an embodiment in which the present invention is applied to an electronic organ, FIG. 2 is a plan view showing details of a second operating portion 6, and FIG. 3 is a circuit configuration diagram of a main portion. ,
FIG. 4A is a diagram showing the relationship between the row input signal KIn and the column output signal KOm for the switches 22, 14, 16, 21, and 15, and FIG. 4B is a schematic view showing the relationship between the signals KIn and KOm. 5 and FIG. 5 are diagrams showing the configuration of the data area of the RAM 30, FIG. 6 is a diagram showing the configuration of the data area of the RAM 31, and FIG. 7 is a switching position of the variation control switch 22 and contents set in the VC register. FIG. 8 is a flow chart for explaining the operation in the rhythm write mode, FIG. 9 is a view for explaining the main operation in the play mode, and FIG. 10 is a diagram showing the storage state of the CNT register in the rhythm write mode. It is a figure which shows change. 1 ... Electronic organ, 4 ... Keyboard, 7 ... Speaker, 1
1 ... tempo lamp, 12, 13 ... ad lib set switch, 14 ... programmable rhythm selection switch,
15 ... Preset rhythm selection switch, 16 ... Rhythm instrument sound selection switch, 17 ... Chord set switch, 18 ... Program tempo / variation switch, 19 ... Start / stop switch, 20 ... Tempo volume switch, 21 ... … Channel selection switch, 22… Variation control switch,
23 ... Mode switch, 25 ... CPU, 26 ... Control section, 27 ... Calculation section, 28 ... Register section, 29 ...
ROM for preset rhythm storage, 30 ... RAM for programmable rhythm storage, 31 ... RA for chord progression storage
M, 33 ... Rhythm sound source, 34 ... Oscillation circuit, 36 ...
Address decoder.

Claims (1)

[Claims] 1. An input means for inputting an adlib rhythm pattern for performing an ad lib rhythm performance, an ad lib rhythm pattern storage means for storing the ad lib rhythm pattern input by the input means, and a performer A mode setting means for setting an input mode when performing an input operation, and an adlib rhythm pattern input by the input means when the input mode is set by the mode setting means Writing means, a steady rhythm pattern storage means for storing a steady rhythm pattern for performing a steady rhythm performance, chord information written in association with the chord progression of the music by the player's input operation, The address written during the specified period by the performer while the chord of the song is in progress. Chord progression storage means for storing rhythm control information, reading means for reading out the chord information and adlib rhythm control information stored in the chord progression storage means according to the chord progression of the music, and the chord information by the reading means. Chord accompaniment means for generating a chord accompaniment sound in accordance with chord information read from the progression storage means to perform chord accompaniment; reading the steady rhythm pattern from the steady rhythm pattern storage means; and the chord progression storage by the reading means. When it is detected that the adlib rhythm control information is read from the means, a control means for controlling the ad lib rhythm pattern to be read from the ad lib rhythm pattern storage means in place of the steady rhythm pattern in the designated period; Stationary rhythm pattern read by means Rui comprising a rhythm performance means for performing a rhythm performance according ad lib rhythm pattern, the automatic rhythm accompaniment apparatus characterized by player has a freely enter the ad-lib rhythm pattern.