JPS6012638B2 - Automatic performance device for electronic musical instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic performance device for an electronic musical instrument, and more particularly, to an automatic performance device for an electronic musical instrument. The present invention relates to an automatic performance system for an electronic musical instrument that is capable of automatic playback.

Generally, operable keys, pedals, levers, push buttons,
According to the displacement of a movable part such as a knob, an electric circuit that obtains a musical tone signal from a multi-harmonic signal such as a square wave signal containing many harmonic components is controlled to generate desired musical tone information or acoustic information. Electronic musical instruments designed to perform this function are well known, for example, as electronic organs.

Conventionally, in such electronic musical instruments, the acoustic information is not recorded on a tape recorder or the like and then played back, but instead the acoustic information is recorded from a multiharmonic sound source signal selected according to the predetermined performance content by the operated keys. An automatic performance system for an electronic musical instrument has been proposed in which analog performance information consisting of the following information is stored in a suitable storage device and is appropriately sent to the tone color circuit or formant circuit of the electronic musical instrument to reproduce the performance.

However, in such conventional electronic musical instrument automatic performance systems, a sound source signal (analog signal) containing multiharmonics is converted into an easy-to-memorize signal such as a magnetic or optical signal according to the selection of a key. It is necessary to convert this stored signal back into the original electrical analog signal.

Therefore, in the process of such re-conversion, the waveform of the original sound source signal is susceptible to deformation due to noise, distortion, etc., which makes it difficult to reproduce the performance faithfully. In this case, if faithful reproduction is to be achieved, special measures must be taken to the subsequent circuits, including the timbre circuit, which complicates the configuration. Also,
According to the above-mentioned conventional automatic performance method, only performance information related to the keyboard, that is, information about pitch and tempo, can be automatically reproduced. etc.) related information cannot be automatically reproduced, and movable parts such as the tone lever and volume knob must be kept in fixed positions until it is time to reproduce the above keyboard-related information, or these parts must be readjusted during playback. It is always inconvenient. Furthermore, according to the conventional automatic performance system as described above, a storage device with a huge storage capacity is required to store the performance information, and it is difficult to find an appropriate means to reduce the storage capacity. Have difficulty. The present invention has been made in view of the above-mentioned points, and most of the movable members (keyboard, tone lever, expression pedal,
pitch, tempo, etc. obtained from the vibrato switch, etc.)
It is an object of the present invention to provide an automatic performance device for an electronic musical instrument that can faithfully and automatically reproduce all performance information such as timbre, volume, vibrato effect, etc. with appropriate modifications as necessary. Another object of the present invention is to provide an electronic musical instrument automatic performance device that can reduce the storage capacity of a device that stores performance information.

In order to achieve these objectives, the electronic musical instrument automatic performance system of the present invention includes digital musical performance information that converts the displacement of each of a plurality of movable members operated according to the performance content into a corresponding digital signal. a circuit device to form;
A circuit device is provided which controls a predetermined signal path using a plurality of electronic switches responsive to the digital performance information to form musical tone information according to the content of the performance from the multiharmonic sound source signal, and detects and stores the digital performance information. The stored performance information is sent to the electronic switch at the appropriate time, thereby allowing all the performance information to be faithfully and automatically reproduced as musical tone information.

Of course, the automatic performance system of the present invention automatically modifies digital performance information as necessary during the storage or playback process.
It is also possible to obtain modified musical tone information. In addition, in order to reduce the storage capacity of the performance information storage device, the digital performance information is stored in a digital signal that indicates the state of change when there is a change in the performance state and the relative time between those changes. It is advantageous to store the information in a compressed form, including relative time information or signals.

According to the automatic performance method of the present invention, since digital performance information is detected and stored from the displacement of the operated movable member, it is possible to detect and store digital performance information from the displacement of the operated movable member. The signal is also not directly stored magnetically or optically, and therefore the effects of noise and distortion can be easily reduced, making it as if the same performer were replaying the same performance. It is possible to reproduce the performance more faithfully. The invention will now be described in detail with reference to embodiments shown in the accompanying drawings.

FIG. 1 shows an electronic musical instrument automatic performance system according to an embodiment of the present invention, in which reference numeral 1 denotes an electronic musical instrument main body that operates according to digital performance information corresponding to the displacement of an operable movable member; This is a performance information processing device that processes the digital performance information obtained from 1 and sends it again to the electronic musical instrument 1.

First, the configuration and operation of the electronic musical instrument 1 will be described.

A plurality of multiharmonic sound source signals 31 from a tone generator 1 (TG) comprising a plurality of oscillators that generate multiharmonic signals rich in harmonic components, such as square wave signals and sawtooth signals, are e.g. field effect transistors. The signal is transmitted to an electronic keyboard switch 2 (EC,) consisting of a group of switching elements such as. A signal generator 16 that generates a digital keyboard signal according to the displacement of each key switch K of the keyboard is connected to this electronic switch 2 via a switch SW2, and the pitch of each key switch is selected according to the content of the performance. , each switching element of the electronic switch 2 is controlled according to tempo-related digital performance information. Multiharmonic sound source signal 32 selected or switched according to pitch and tempo
are led to timbre circuits 3 to 5 (TCF, ~TCF3) each including a timbre filter or faultmant filter,
Here, musical tone signals 33 and 34 are waveform-shaped according to the furnace wave characteristics of the tone circuits 3 to 5, and are given frequency vectors of each of flute, string, and reed tones, for example.
, 36. Musical tone signals 33 to 35 are connected to tone lever electronic switches 6 to 8 (EC3 to EC), respectively.
5) are transmitted to the mixing circuit 9 as musical tone signals 36 to 38 whose amplitudes are controlled between the 0 level and the input level. Tone lever L corresponding to each electronic switch 6 to 8
The digital lane lever signal generator 17 having .about.L3 provides a digital signal for switch control according to the displacement of each tone lever to each of the electronic switches 6 to 8 via the switch SW3. That is, tone levers L, ~L3
By appropriately operating the displacement between the minimum value and the maximum value according to the performance content (in the case shown, it can be operated in four stages), for example, the displacement of each tone lever 6 to 8 can be adjusted to a low When set to -, medium 'b}, and high 'c,
Flute, string, and lead musical tone signals 33~
35 can be changed into musical tone signals 36-38 with corresponding amplitudes of low, medium and high, respectively. Of course, it is also possible to move one tone lever to the zero position [di' so that the corresponding one musical tone signal is not output. Musical tone signals 36 to 38 whose amplitudes are controlled in this way
The mixed output signal 39 mixed by the mixing circuit 9 (MC) is
The signal is sent to the output amplifier 11 via the expression electronic switch 10 (EC6).

A pedal signal generator 18 having an expression pedal P converts the displacement of the pedal P into a corresponding digital signal, and is connected to an electronic switch 101 including a switching element that responds to this digital pedal signal via a switch SW4. be done. Electronic switch 10 provides a mixed output 40 whose amplitude is controlled in response to a digital signal corresponding to pedal displacement. An amplified musical tone signal 41 from output amplifier I1 receiving this mixed output 40 is converted into an acoustic signal by speaker 12. By the way, the tone generator 1 includes a vibrato oscillator 14 (V
O) is connected via an electronic switch 13 (EC2).

A push-button signal generator 15 having a push-button switch B that is operated when a vibrato effect is desired is provided, and a digital signal obtained from this signal generator 15 is guided to the electronic switch 13 via a switch SW, which is controlled. Let them do it. In the above case, the movable members operated during performance include vibrato push button switch B;
The key switch K, tone levers L to L3, and expression pedal P are shown as examples, but depending on the type of electronic musical instrument, there may be many more operating members, and if necessary, the above-mentioned digital performance can be performed for all of these operating members. It is clear that the method can be applied.

In any case, the electronic musical instrument 1 having the above-mentioned configuration has all digital performance information obtained by the player operating each movable member, that is, digital performance information related to pitch, tempo, timbre, volume, and various effects. This allows the speaker 12 to obtain musical tone information corresponding to the user's needs.

Therefore, here, we will discuss in detail the digital performance control means that is particularly different from conventional electronic musical instruments.

The push-button switch B and key switch K for the vibrato effect can both be mechanical switches that take two states, on and off.
5 and 16 may be configured such that on/off outputs can be taken out from closed circuits that are turned on/off by these switches.

Since each tone register L, -L3 has four different positions, an A-D converter is provided to convert the angular displacement of the lever into a digital signal.

Similarly, an AD converter is provided to convert the displacement of the expression pedal P into a digital signal. These A-
An example of the converter is shown in Figures 2a and 2b. 2nd a
The figure shows an A-D converter for the tone lever, and a rotary switch 130 has a 2-bit encoder 131 and a rotary switch 130 that has four contacts corresponding to the four angular positions of the tone lever.
are combined so that the four displacement states can be converted into a 2-bit binary signal. FIG. 2b shows an A-D converter for an expression pedal, with a single point rotary switch 1 on the input side of a 4-bit encoder 141.
40 are connected. That is, since the displacement of the pedal is normally converted into an angular displacement, the angular displacement is quantized into 1 digit by the rotary switch 14, and the angular displacement in 1-$ steps is converted into a 4-bit binary signal by the encoder 141. It looks like this. FIGS. 3a and 3b illustrate the detailed configuration of an A-D converter relating to the connection between the rotary switch and the encoder.

Although the A-D converter in this example is for a tone lever (2 bits), it will be clear from the following description that one for a pedal (4 bits) may be similarly constructed.
A shaft 150 is rotatably attached to a fan-shaped code plate 151 having a cover 152. This shaft 150 is given angular displacement by a tone lever, and this rotary shaft 15 fixes a supporting member 153 to which a sliding member 154 is fixed by a bolt/nut pair 155. Contacts 159 and 160 that are electrically insulated from each other are attached to the sliding member 154, and this pair of contacts are connected to NAND gates 160a and 160.
0b inputs, respectively. Two arcuate insulating layers 156 and 157 are juxtaposed in the radial direction on the surface of the code plate 151, and ground metal layers 158a to 158c are formed on each insulating layer in the shape shown in the figure. A with such a configuration
- In the ○ converter, NAND gates 160a, 160b
A potential V is applied to each input terminal of the input terminal through a resistor, and in order to prevent chattering, the rotary shaft 150 is rotationally driven by a tone lever to cause the sliding member 154 to assume four different angular positions. , Nant gate output terminal T,,
A 2-bit (4-state) binary signal can be obtained at L.

The electronic switches 6 to 8, 10' are controlled by the output digital signals of these signal generators 17, 18, respectively.In particular, although these electronic switches are controlled by digital signals, they control input analog signals according to the control signals. It is an analog switch that transmits data to the output side, and can have a configuration as shown in FIGS. 4a and 4b, for example.

FIG. 4a shows an electronic switch 6, 7, or 8 used in correspondence with the A-D converter of FIG. 2a already illustrated for the tone lever, and for example, switching elements S, . . . A solid-state switching circuit 133 consisting of S4, a voltage dividing resistor circuit 134 having a tap connected to an input terminal of this circuit, and a decoder 132 connected to a control input terminal of the circuit 133 are provided. Now, one of the musical tone signals 33 to 35 is applied to the input state To, and the converter output terminals T, , T2 of FIG. 2a are applied to the terminals T, , L.
If a 2-bit binary signal is applied from 0 to 0, one of the switching elements S, to S4 is turned on according to the binary signal, thereby creating a four-step difference between the input level and the 0 level. A musical tone signal 36, 37, or 38 having an amplitude level of 1000 MHz can be obtained at the output terminal Q. Fig. 4b shows a 4-bit analog electronic switch used in correspondence with the converter shown in Fig. 2b, which converts the divided voltage output taken out from each tap of the voltage dividing resistor circuit 144 through which the musical tone signal flows into the output of the 4-bit decoder. A solid-state switching circuit 143 comprising controlled switching elements S, .about.S, 6 is selectable in response to a 4-bit binary signal applied to the decoder inputs T, .about.L, as shown in FIG. 4a. It is easily understood that it functions similarly to an electronic switch. Switches SW, ~SW4 are the electronic musical instrument 1
This device is used to switch between actual performance by a performer and automatic performance by an information processing device, and these movable contacts are normally linked, but when this automatic performance device is applied to a training system, etc., which will be described later. does not necessarily need to be linked.

When the movable contacts of the switches SW and SW4 are brought into contact with the contacts x and x4, respectively, as shown, the player can operate the electronic musical instrument 1. materials, namely the key switch K of the keyboard, the tone lever ~-, the expression pedal P,
As soon as you operate the vibrato switch B etc. according to the performance content, digital performance information is obtained evenly from each contact point x.
Musical tones or tone information corresponding to this digital performance information are obtained from the speaker 2. Next, the configuration and operation of the performance information processing device B will be described. In FIG. 1, digital performance information 46 consisting of digital signals 42 to 45 obtained from contacts x, to
D), the compressed digital performance information 47 includes a digital signal including a change (event) in the performance state when the change occurs and a relative time signal indicating the relative time between the changes. It is stored in the storage device 22 (MEM).

The stored contents of the memory device 22 are read out to the information reproducing device 23 (IRD) as digital information 48 and reproduced as performance information 49 in the original uncompressed form, and are connected to the other contacts y, to y4 of each switch. Distributed supply.

Control signals 54 to 54 control the operations of these devices 21 to 23, respectively.
A control device 24 (CD) is provided which controls at 56. In this embodiment, the information compression detection device 21 and the information reproducing device 23 are provided, and the reason why the digital performance information obtained from the electronic musical instrument 1 is not directly stored and reproduced by the storage device 22 is because the huge amount of digital This is to allow performance information to be stored using a storage device with as low a storage capacity as possible. By configuring the performance information processing device 0 in this way, switches SW, -
The movable contact of SW4 is set, and the player's performance is stored in the storage device 22 as compressed digital performance information 47, and after the performance is finished, the switches SW, ~SW4 are switched at a suitable time.
By inserting the movable contacts into the y, to y4 sides, the storage device 22
By outputting the digital performance information 48 from the information reproducing device 23, reproducing it, and distributing it to each contact point y, to y4, it is possible to cause the electronic musical instrument 1 to automatically perform an unmanned performance. In this case, for example, without putting the switch SW2 into the y2 flea side, the other SWs,, SW3, and SW4 are turned on to y,, ×, respectively.
Insert it into the y4 contact side for vibrato effect and tone control. It is also possible to automatically reproduce only performance information related to control and expression (volume) control, leaving the performer to perform only the keyboard performance. As is clear from the above description, some terms used in this specification will be defined here.

That is, '1' ``movable members'' refer to keys, tone levers, volume adjustment knobs, vibrato effect levers, expresso pedals, etc. that are operated by the performer according to the content of the performance during performance. (2) "Digital performance information" refers to information obtained by converting the displacement amount or displacement state of a movable member into a corresponding digital amount; for example, this information is a 256-bit binary signal. '3} "Event" means the state of the mobile village (
It refers to the change in the state of the movable member between the current scanning time and the previous state scanning time when detecting the status (status). (4) "Relative time" refers to the time interval between one event and the previous event, and is indicated by △T.'5'
"Status word" refers to digital performance information corresponding to the status of a plurality of blocks of movable members. {6
1 "Event check word" refers to digital information indicating the block where an event occurred. {7'"Compressedinformation" refers to information that includes status words, event check words, and digital information indicating relative time;
One of the features of the present invention is that a huge amount of performance information is processed by combining a plurality of pieces of information. below,
The specific configuration and operation of the performance information processing device 0 will be explained with reference to FIG.

In the same figure, contact points x and -yen for guiding each digital performance information signal 42 to 45 are event detection circuits 62 to 65, respectively.
(EDC, to EDC4).

These event detection circuits 62 to 65 compare digital information regarding the corresponding movable members at regular time intervals, detect events as data changes, and send the results to the control processor 92. here,
As a representative example, an event detection circuit 62 that detects an event related to a keyboard, that is, a change in the playing state of the keyboard will be described.

A digital signal 43 corresponding to the displacement of the key switch K obtained from the keyboard signal generator 16 is changed to T? by the clock pulse 2. The signal is sequentially read out to the parallel-in-serial-out shift register 71 (SR,) every 2 cycles, where 2=1/f.

The keyboard information expressed in a certain period is sequentially sent to the serial in/parallel out shift register 72 (SR2) at a period of T0,=T02/n (here, n=24, for example) by clock pulse 0. shift register 7
Is the content of 2 a clock pulse? 2, the data is written into the buffer register 74 (BFI) at the same time as this forwarding. The digital signal indicating the performance status of each key outputted to the shift register 71 in the next cycle of clock pulse 2 is sent to the shift register 72 at the exclusive OR gate 73, and the digital signal indicating the performance status of each key in the previous cycle is outputted to the shift register 72. The contents and each corresponding key are compared bit by bit. In this comparison, 1
If the bits do not match, the exclusive OR gate 73 produces an output, which is sent to the flip-flop 75 (FF).
is temporarily stored. That is, if even one bit of the digital signals compared by the exclusive OR gate 73 does not match, it means that a performance state change (event) of ON or OFF has occurred in one of the key switches. The flip-flop 75 has its output terminal connected to its input terminal for feedback, and if there is even one event bit in the comparison result of the exclusive OR gate 73, the stored contents will eventually be converted to that event bit. Become. For example, for simplicity, 1 with exclusive or gate 73
The 6-bit digital signals are compared and the result is “00
011000000000000'', the memory contents of the flip-flop are ``00011111111''.
11111", and finally "1" is stored. For example, if the shift registers 71 and 72 are configured to store 256-bit keyboard performance information, the comparison in the exclusive OR gate 73 and the temporary storage in the flip-flop 75 are performed for each 16-bit block. The detection results for each bit (block) may be temporarily stored in another shift register (not shown). As can be seen, in this case, the information in the shift register (other registers not shown) corresponds to one event check word. In any case, the stored contents of flip-flop 75 are guided to OR gate 66. The input terminal of the OR gate 66 is connected not only to the event output of the keyboard event detection circuit 62 but also to each of other vibrato switches, tone levers, and expression pedals that perform similar detection operations in parallel with this detection circuit 62. The event outputs of the event detection circuits 63, 64, and 65 are led, and the result of the OR logic is outputted at the AND gate 67 as a storage request signal, ie, a request store signal 100, in synchronization with the clock pulse ◇2.

Additionally, a counter 61 is provided which is driven by a clock pulse J2 and cleared by the output CP of the processor 92 (not shown on the processor 92 side) to indicate the relative time between event signals.

That is, the counter 61 constantly counts clock pulses 2, which are output from the control processor 92 upon generation of the request store signal 100. Therefore, it is cleared every time an event signal is sent from each of the detection circuits 62 to 65. In this way, the count value immediately before the counter 61 is reset by the generation of an event signal, then counts the second clock pulse, and is reset again by the generation of the next event signal is the same as that from the previous event signal generation to the current event signal generation. corresponds to the time up to the time. The count value of the counter 61 represents the elapsed time since the previous event signal was generated. In this way, performance information for all movable members (e.g. 5
12 bits) is detected. The request store signal 10 based on the event detected as described above is transmitted to the control processor 92 (C
P) is driven.

This control processor 92 performs, for example, 8-bit parallel processing, and in addition to general functions such as logical operations, arithmetic operations, data transfer, and jumps, it also performs instructions stored in a read-on memory 91 (ROM). The value of the program counter can be arbitrarily set using an external signal. That is, the control processor 9
2 (CP) according to the instructions of the read-on memory 91 (ROM) in which information processing procedures or instructions are stored in advance.
The request store signal 1 is sent to the first first out memory 93 (FIF○,) by the command signal 112.
00, the event relative time signal 101 of the counter 61 and the content 10 of the buffer register 74
2 and other detection circuits 63 to 65, in which the detection results for every 16 bits are stored.
A "1" in the register stores the word for a certain bit. Each time this storage is completed, the counter 61 and flip-flop 75 are cleared by a clear pulse CP, and one sequence of checks is completed. Then, the above-described detection and storage operation is repeated over the entire performance process of the electronic musical instrument 1.
The FIF○, 93 is a type of temporary storage device that outputs the information inputted first, and the control processor 92 periodically stores the stored information 110 each time the stored content of the FIF○, 93 reaches a predetermined amount. The memories 93 and 94 are controlled by command signals 112 and 113 so as to transfer the data to the cassette tape memory 94. In this way, all performance information is compressed on the cassette tape in the cassette tape memory 94, including a digital signal containing changes in the performance state when the change occurs, and a relative time signal indicating the relative time between the changes. The information is stored in the form of a compressed event matrix (i.e., a compressed information data format).

- In this case, in order to store irregularly compressed information in a simple memory 94 capable of long-term storage, an F
Providing an IFO memory 93 is extremely beneficial. Furthermore, it is understood that storing such a huge amount of performance information in a compressed form is extremely effective in reducing the storage capacity of the memories 93 and 94. For example, in an automatic performance system that displays all performance information as a 512-bit binary signal, considering that at most only a few dozen bits change during the actual performance, the compression detection storage method described above is The importance of reducing capacity and thus simplifying the overall device and reducing costs is clear. The configuration and operation of the system for compressing, detecting and storing digital performance information have been described above. Next, the configuration and operation of the system for reproducing the stored digital performance information will be described.

In the cassette tape memory 941, the compressed digital performance information indicates the relative event times ΔT, to ΔTn and the address of the buffer register where the event occurred, as shown in FIGS. 6a and 6b. The event matrices are stored in the form of event matrices 1 to n, including event check words to indicate the event and status words to indicate the contents of the buffer register when an event occurs.

These event matrix information 111 are sequentially and periodically stored in the first first out buffer memory 95 (F
IF02). This read operation is controlled by the control processor 92, which receives command signals 1, 13, 1.
14 is used. In this performance information reproducing device, a parallel-in/serial-out shift register 87 (SR3) is stored from the memory 95 as performance information 1 of pitches related to the keyboard.
16. Parallel in-parallel out buffer register 82 (BF3) contains information 117 about the presence or absence of vibrato effect.
, parallel in-parallel out buffer register 8
3 (BF4) contains 118 tone lever-related tone information.
, parallel in-parallel out buffer register 8
Expression pedal-related volume information 119 can be read out from 4 (BF5), and event relative time information 120 can be read out from counter 83 (CT3).

Control processor 92 reads commands from memory 91 and controls memories 94, 95, counter 88 (CT2), and shift control register 90 (SCR) using command signals 113, 114, and 115, respectively.

Serial in-parallel out shift register 86 (
SR4) is provided to perform modifications such as automatic key transposition and tempo changes, which will be explained later.
2) is for performing a buffer function when transferring keyboard information to an electronic musical instrument. At ANDGATE 89,
The supply of clock pulse J3 is controlled in accordance with the command signal read out from shift control register 901, and its output signal 125 becomes a shift control signal for shift registers 86 and 87, and at the same time is counted by counter 88. Counter 88 clears register 90 with its ripple clock signal 127. In order to reproduce the performance information, first, a signal of the event relative time ΔT is sent to the counter 85 (CT3), and the counter 85 is counted down with a clock pulse of 2.

This counter 85 is decremented by the clock pulser 2, and a signal whose content becomes "0" (underflow signal) is sent to the control processor 92 as an information request signal or request data signal 121. In response to this signal 121, the control processor 92 first checks the contents of the event matrix starting from the address indicated by the event check word, and selects the parallel line-serial out shift register 87 (SR3) and buffer registers 82 to 84 having the corresponding address. (BF
It instructs the memory 95 to write the status word in BF3 to BF5). Further, the counter 85 similarly counts down the event relative time △chi until its contents become zero.
The contents of 82 to 84 are retained. In this way, the counter 85 counts the event relative time to detect the event, and by issuing a status word containing the event bit corresponding to the event, information related to pitch, timbre, volume, effect, and tempo is generated. becomes possible to play. Shift registers 86 and 87 have four operating modes: clock inhibit, right shift, left shift, and parallel load, and these controls are performed independently by a signal 128 from shift control register 90.

Note that during the operation mode of the shift registers 86 and 87,
Clock inhibit interrupts the clock input and
Shift to the right is a state in which the data is shifted to the right; Shift to the left is a state in which data is shifted to the left; 8 parallel load is a state in which parallel data is input from the outside. shows. Now buffer register 81
To describe the operation of transferring the keyboard information 124 to , {1-set the shift register 87 to parallel load, write a status word as predetermined information to the '21 shift register 87, and write the number of bits transferred to the leg force counter 88. In other words, the number of bits in the shift registers 86 and 87 is written and the shift registers 86 and 87 are controlled by the shift control register 90.
87 is set to right shift mode, and counter 88 is enabled to count down.

This transfer and counting is performed by clock 125. In this case, when the transfer ends and the counter 88 becomes 0, the generated ripple clock signal 127 clears the shift control register 90, and the counter 88 and shift register 8
6 and 87 are canceled. The above operations are related to faithful playback, but if modulation modification playback is required,
You can do it as follows. First, consider the case of transposing.
In this case, the key information is stored in the shift register 86 in a normal state due to the above-mentioned operations '1). However, since each bit of the shift register 86 accurately corresponds to the information of each key, for example, in order to transpose the key a semitone higher, it is sufficient to shift the contents of the shift register 86 to the right by one bit. That is, depending on how many bits the contents of the shift register 86 are shifted to the right or left, the number of times the key is transposed to the treble side or the bass side is determined. Therefore, in order to perform the specified transposition, the above-mentioned '
Following the operations 1) to '3}, '4} writes a predetermined shift number (the number of degrees to be modulated) to the counter 88, and '5} shifts the shift register 86 to the right or left according to the predetermined modulation direction. Shift mode is set, shift register 87 is set to clock inhibit mode, and counter 88 is set to
should be made countable.

Furthermore, by rearranging the contents of the shift register 86 in a completely reverse order, it is possible to obtain a very special effect as if the keyboard was played with the left and right sides completely reversed, and this is called reverse keying. If this reverse synchronization is required, the shift register 87 and shift register 86 may be set to the right shift mode and the left shift mode, respectively, and the same operations may be performed thereafter. Next, let us consider the case of performing modified playback that changes the tempo of a song.

In order to change the tempo of the song, it is sufficient to change the event relative time ΔT related to the keyboard information. That is, changing ΔT changes the speed at which the key (tone) changes, increasing ΔT slows the tempo, and shortening ΔT speeds up the tempo. For this purpose, the clock pulse 02 of counter 85 is
All you have to do is make the frequency variable and control it manually. That is, for example, if the frequency of the clock pulse 2 to the counter 85 is increased, the request data signal 121 is outputted from the counter 85 earlier. Therefore, the status words written to the shift register 87, counter 88, and register 90 change quickly. Alternatively, the control processor 9
In step 2, multiply the event relative time △T by the arbitrary constant Q, and calculate △
A similar purpose can be achieved by writing the value T'=QΔT into the counter 85. As described above, information related to pitch and tempo is read to the buffer register 81. On the other hand, information related to volume, timbre, and effects are stored in buffer registers 83, 82, and 84, respectively, by changes (
events) are read out for each period.

After all, since the digital performance information of the corresponding operating member of the electronic musical instrument is reproduced in each buffer register 81 to 84, the contents of each register are periodically distributed to the corresponding contacts y, to y4 by clock pulses ◇2. By supplying the information, it becomes possible to reproduce musical tone information corresponding to the stored performance information through the electronic musical instrument 1.

In the above embodiment, instead of the memory 94, a disk,
Of course, a known storage device using a semiconductor memory, a magnetic tape, an optical card, etc. can be used, and the internal logic circuit configuration of the information processing device 0 is not limited to the above embodiments, but can be modified by a pulley as desired. Various circuits solved by algebra can be substituted.

Furthermore, it will be obvious that a known computer may be applied to the information processing apparatus without departing from the spirit of the present invention. As described above, the automatic performance device for an electronic musical instrument of the present invention has the following excellent effects.

{1) Since digital performance information is detected, stored, and reproduced in accordance with the displacement of the operating member, extremely faithful performance reproduction is possible, and modification reproduction can also be performed as appropriate.

'21 By digitally processing a huge amount of performance information, it is possible to reduce the storage capacity of a performance information storage device. '
3) By extracting digital performance information from all operating members, the performer's hands are not required at all during playback, and even a person who is not familiar with electronic musical instruments can reproduce fully automatic performance.

[4- During playback, for example, by setting the playback operation so that only keyboard-related information is played and other tone, volume, and effect-related information is not played, or vice versa, in line with automatic playback, It is possible for other performers to give performance information that is not automatically played back to the electronic musical instrument,
This can assist in performance practice, composition, or arrangement activities. The automatic performance device of the present invention having such effects is extremely useful when applied to, for example, unmanned demonstration performances of electronic musical instruments, simulations of electronic musical instruments, performance training systems for electronic musical instruments, and the like.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an automatic performance device for an electronic musical instrument according to an embodiment of the present invention, FIGS. 2a and 2b are configuration diagrams of an A-D converter for an angular displacement member used in the above embodiment,
Figures 3b and 3b are detailed configuration diagrams of the above A-○ converter, and in detail, a top view of the code plate and its sectional view along the mB-mB line, and Figures 4a and 4b are the detailed configuration diagrams of the above A-○ converter. The wiring diagram of the analog electronic switch circuit used in the example, Figure 5, is as follows:
A block diagram showing details of the performance information processing apparatus of the apparatus shown in FIG. 1, and FIGS. 6a and 6b are diagrams for explaining the information processing operation of the apparatus shown in FIG. 5. 1...Electronic musical instrument, 0...Performance information processing device, 1...Tone generator, 2...
Electronic keyboard switch, 3-5... Tone circuit, 6
~8...Electronic switch for tone lever, 9...
・...Mixing circuit, 10...Electronic switch for expression, 11...Output amplifier, 12...
... Speaker, 13 ... Electronic switch for vibrato, 14 ... Vibrato oscillator, 15.
...Push button signal generator, 16...Keyboard signal generator, 17...Tone lever signal generator, 18...Pedal signal generator, 21. ...
...Performance information compression detection device, 22...Storage device, 23...Performance information reproducing device, 24...
・Control device, 61, 85, 88...force counter, 71, 7
2, 74, 81-84, 86, 87, 90...shift register, 62-65...event detection circuit, 7
3... Exclusive OR gate, 75... Flip-flop, 66... OR gate, 67, 89... AND gate, 91... Read only memory, 92... Control processor, 94... Cassette tape memory, 93
,95...First-in-first-out memory, 1
33, 143...Switching circuit, 150...
・Rotating shaft, 151... Code plate, 154...
...Sliding member, 160a, 160b...Nand gate. Shio ``Figure leopard 2o figure 2b figure 3rd figure 30 figure 4o figure 4b figure A S figure leopard 64 figure leopard 6b figure

Claims (1)

[Claims] 1 Keyboards and tone selection members that are operated according to the performance content,
A digital performance information forming device that converts the displacement of each movable member such as a volume control member and an effect control member into corresponding digital performance information; and a digital performance information forming device that extracts the digital performance information at a predetermined period and compares it for each adjacent period. an event signal generating device that generates an event signal indicating that a change has occurred in the performance state when the compared signal states do not match; an apparatus for selecting a digital signal that includes a signal state change at the time of occurrence of an event signal; and an apparatus for generating a relative time signal indicating the relative time between the event signals;
A storage device that associates the selected digital signal and the relative time signal and stores them as compressed information; and a storage device that reads out the digital signal and the relative time signal stored in the storage device and stores the digital signal and the relative time signal according to time. Reproduces digital performance information by stretching the signal,
a reproducing device that outputs the reproduced digital performance information at a predetermined cycle; and a reproducing device that outputs the reproduced digital performance information in accordance with the displacement of the movable member and/or the reproduced digital performance information that is output from the reproducing device. The present invention is characterized by comprising a distribution device which selects and outputs each arbitrarily by each switching means provided correspondingly to the distribution device, and a musical tone signal forming device which forms musical tone information in accordance with digital performance information outputted from the distribution device. Automatic performance device for electronic musical instruments.