JPS6055909B2 - automatic performance device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic performance device that automatically reproduces musical instrument performance sounds in, for example, a keyboard-type electronic musical instrument.

2. Description of the Related Art Conventionally, automatic performance apparatuses have been known that have a device for detecting keyboard performance information of an electronic musical instrument in the form of a multiharmonic sound source signal selected by a key switch of a keyboard and storing the detected information on, for example, a magnetic tape.

However, such a performance information storage device (a) converts a multiharmonic sound source signal, which is an analog signal, into, for example, a magnetic quantity and stores it, so the performance information may be affected by noise, distortion, etc. during the conversion process. There are problems such as: (b) it is difficult to store faithfully, and (b) the amount of performance information to be stored is enormous, so a memory with an extremely large storage capacity is required.
The present invention has been made to solve these problems, and an object of the present invention is to provide an automatic performance device having a performance information device capable of faithfully storing information with a reduced storage capacity.

In order to achieve this object, the automatic performance device of the present invention uses digital performance information corresponding to the displacement of a plurality of operators as a digital signal containing the change when the performance state changes, and a relative relationship between the change. A storage device for recording a relative time signal in a compressed form indicating time, a device for reading the relative time signal from the storage device and generating an event signal in response to the arrival of a period of change, and a device for generating an event signal in accordance with the arrival of a change period; Musical instrument reproduction sounds are obtained using a buffer memory that reads out and stores digital signals corresponding to periods of change from a storage device, and digital performance information stored in this buffer memory.

In addition to the constituent elements of the specified invention, another invention includes a plurality of operators, an operator status signal generator that generates an operator status signal, and a controller that indicates that a change in the operator status has occurred. The device includes a device that generates event signals and a relative time generator that indicates the relative time between the event signals.

With this configuration, since digital signals corresponding to the displacement of each control element are handled instead of analog signals such as multiharmonic sound source signals, faithful storage is possible, and furthermore,
By storing digital signals and relative time signals for each change in performance status, there are practical benefits such as the ability to significantly reduce the storage capacity of the storage device.

Embodiments of an automatic performance device for an electronic musical instrument according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of an automatic electronic musical instrument performance device according to the present invention, where I is an electronic musical instrument body that operates according to digital performance information corresponding to the displacement of an operable controller, and There is a performance information processing device that processes the digital performance information obtained from the electronic musical instrument 1 and sends it to the electronic musical instrument I again.
First, the configuration and operation of the electronic musical instrument 1 will be described.

For example, a plurality of multiharmonic sound source signals 31 are generated from a tone generator 1 (TG) consisting of a plurality of oscillators that generate multiharmonic signals rich in harmonic components such as square wave signals and sawtooth wave signals. The signal is transmitted to an electronic keyboard switch 2 (EC,) consisting of a group of switching elements. A signal generator 16 that generates a digital keyboard signal according to the displacement of the switch K of each key of the keyboard is connected to this electronic switch 2 via a switch SW2, and the signal generator 16 generates a digital keyboard signal according to the displacement of the switch K of each key of the keyboard. Each switching element of the electronic switch 2 is controlled according to digital performance information related to pitch and tempo. The multiharmonic sound source signals 32 selected or switched according to the pitch and tempo are guided to tone circuits 3 to 5 (TCF1 to TCF3) each including a tone filter or a formant filter. The waveform is shaped according to the t-wave characteristics of ~5,
For example, musical tone signals 33, 34, 3 given the frequency spectra of flute, string, and reed tones.
Output as 5. Musical tone signals 33 to 35 are electronic tone lever switches 6 to 8 (EC3 to EC5), respectively.
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 lever corresponding to each electronic switch 6 to 8 ~L
A digital tone lever signal generator 17 having a switch SW3 supplies a digital signal for switch control according to the displacement of each tone lever to each of the electronic switches 6 to 8 via a switch SW3. In other words, tone lever L~! If the displacement is appropriately operated from the minimum value to the maximum value according to the content of the performance (in the case shown, it can be operated in four stages).
) For example, set the displacement of each tone lever 6 to 8 to low,
When set to medium or high, the flute, string, and lead musical tone signals 33 to 35 are set to low, medium, and high, respectively.
The musical tone signals 36-38 can be changed to have a corresponding amplitude of high. Of course, it is also possible to set one tone lever to the zero position so that the corresponding one musical tone signal is not output. A mixed output signal 39 obtained by mixing the tone signals 36 to 38 whose amplitudes have been controlled in this manner in the mixing circuit 9 (MC) is sent to the output amplifier 11 via the electronic expression 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 via a switch SW4 to an electronic switch 10 including a switching element that responds to this digital pedal signal. 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 11 receiving this mixed output 40 is converted into an acoustic signal by speaker 12. By the way, tone generator 1
In order to obtain a vibrato effect by vibrato modulating the multiharmonic sound source signal, a vibrato oscillator 14 (VO
) are 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 SWl to control it. Do it like this. In the above case, the operators operated during performance include the vibrato push button switch B1, the key switch K1, the tone lever L1~! , the expression pedal P is shown as an example, but some types of electronic musical instruments have many more operators, and the above-mentioned digital performance method can be applied to all of these operators as necessary. It is clear that it can be done.

In any case, the electronic musical instrument 1 configured as described above is capable of handling all digital performance information obtained by the player operating each operator, that is, digital performance information related to pitch, tempo, tone, and various effects. The corresponding musical tone information can be obtained from the speaker 12.

Therefore, the digital performance control means, which is particularly different from conventional electronic musical instruments, will now be described in detail.

The push-button switch B1 for vibrato effect and the key switch K 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 output from closed circuits that are turned on/off by these switches.

Since each tone lever L1-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 a D converter is shown in Figures 2a and 2b. 2nd a
The figure shows an A-D converter for 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 contact rotary switch 14 on the input side of a 4-bit encoder 141.
0 is connected. That is, since the displacement of the pedal is normally converted into an angular displacement, the rotary switch 140 quantizes the angular displacement to one level, and the encoder 141 converts the angular displacement of one level into a 4-bit binary signal. It's getting old. Figures 3a and 3b show A-D related to the connection between the rotary switch and the encoder.
The detailed configuration of the converter is illustrated.

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) can 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 an angular displacement by a tone lever, and a supporting member 153 to which a sliding member 154 is fixed by a bolt/nut pair 155 is fixed to this rotary shaft 150 . The sliding member 154 is equipped with operating points 159 and 160 that are electrically insulated from each other, and this pair of contacts are connected to NAND gates 160a and 160.
0b inputs, respectively. Two arc-shaped insulating layers 156 and 157 are juxtaposed in the radial direction on the front 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.Such a structure In the A-D converter, NAND gates 160a, 160
A potential Vcc is applied to each input terminal of b via a resistor, and the rotating shaft 150 is rotationally driven by a tone lever with a resistor and a capacitor being interposed between the sliding member and the ground to prevent chattering. 154 in four different angular positions, the NAND gate output terminals Tl,
A 2-bit (4-state) binary signal can be obtained at T2.

Regarding the electronic switches 6 to 8, 10, which are controlled by the output digital signals of these signal generators 17, 18, respectively, 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 to the output side, for example, the fourth
The structure can be made as shown in FIG. 4a and FIG. 4b.

FIG. 4a shows an electronic switch 6, 7, or 8 used for the A-D converter of FIG. 2a, already illustrated as a tone lever, from switching elements S1 to S4, such as field effect transistors. A solid state switching circuit 133 consisting of a solid-state switching circuit 133, 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, input terminal T. applying one of musical tone signals 33 to 35 to
The converter output terminals Tl, T2 of Fig. 2a are connected to the terminals Tl, T2.
When a 2-bit binary signal from 0 is applied, one of the switching elements S1 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 kHz can be obtained at the output terminal 9. FIG. 4b shows a 4-bit analog electronic switch used in correspondence with the converter shown in FIG. A solid-state switching circuit 143 including output-controlled switching elements S1-S16, which can be selected in response to a 4-bit binary signal applied to decoder inputs T1-T4, is connected to the electronic switch of FIG. 4a. It is easily understood that they function similarly. Switches SWl to SW4 are the electronic musical instrument 1
This device is used to switch between actual performance by the performer and automatic performance by the information processing device ■.These movable contacts are normally linked, but when this automatic performance device is applied to a training system etc., which will be described later. do not necessarily need to be linked.

When the movable contacts of the switches SW1 to SW4 are brought into contact with the contacts X1 to X4, respectively, as shown in the figure, the player can touch the movable controls of the electronic musical instrument 1, that is, the key switch K of the keyboard.
1 tone lever! , expression pedal P1
As the vibrato switch B etc. is operated according to the content of the performance, digital performance information is obtained from each contact point X1 to X4, and the tuning fork corresponding to this digital performance information obtains acoustic information from the speaker 12. . Next, the configuration and operation of the performance information processing device (2) will be described.

In FIG. 1, digital performance information 46 consisting of digital signals 42 to 45 obtained from contacts X1 to Digital performance information 47 in compressed form, including a digital signal containing changes and a relative time signal indicating the relative time between the changes, is stored in storage device 22.
(MEM).

The storage contents of this storage device 22 are as follows. The digital information 48 is read out to the information reproducing device 23 (IRD), reproduced as the original uncompressed performance information 49, and distributed to the other contacts Y1 to Y of each switch.

Control signals 54 to 54 control the operations of these devices 21 to 23, respectively.
A control device 24 (CD) is provided for controlling 56 and 56. In this embodiment, the information compression detection device 21 and the information reproducing device 23 are provided, and the digital performance information obtained from the electronic musical instrument 1 is not directly stored and reproduced by the storage device 22. This is to allow digital performance information to be stored using a storage device with as low a storage capacity as possible. By configuring the performance information processing device ■ in this way, switches SWlS can be placed at the positions X1 to X shown in the figure.
The movable contacts of switches SW1 to SW4 are set, and the performer's performance is stored in the storage device 22 as compressed digital performance information 47, and the movable contacts of switches SW1 to SW4 are set to Y1 to Y4 at a suitable time after the performance is finished. Insert it into the storage/device 22
The digital performance information 48 is read out by the information reproducing device 23, reproduced, and distributed to each of the contacts Y1 to Y, thereby allowing the electronic musical instrument 1 to perform automatically and unattended. In this case, for example, without putting the switch SW2 into the Y2 contact example, the other SWl, SW3, and SW4 are connected to Yl and Y3, respectively.
, Y4 contact side to automatically reproduce only the performance information related to the vibrato effect, tone control, and expression (volume) control, so that the player only plays the keyboard. As is clear from the above description, some terms used in this specification will be defined here.

That is, (1) r-operations refer to keys, tone levers, volume control knobs, vibrato effect levers, expressions, pedals, etc. that the performer operates according to the content of the performance during performance. (2) 1 Digital performance information refers to information obtained by converting the displacement position or displacement state of an operator into a corresponding digital quantity. For example, this information is a 256-bit binary signal. (3-bibencho refers to a change in the state of a control between the current scanning time and the previous state scanning time when detecting the state of the control.
(4) Relative time refers to the time interval between one event and the previous event, and is indicated by ΔT. (5) rStatus wordo refers to digital performance information corresponding to the states of the operators divided into a plurality of blocks. (6) The r-event check word is digital information indicating the address of the block where the event occurred. (7) Compressed information 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 (2) will be explained with reference to FIG.

In the figure, contacts X1 to X4 that lead to digital performance information signals 42 to 45 are connected to event detection circuits 62 to 66, respectively.
5 (EDCl to EDC4).

These event detection circuits 62 to 65 compare digital information regarding the corresponding operators 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 sequentially input in parallel at intervals of Tφ2=1/fφ2 by the clock pulse φ2.
It is read out to the serial out shift register 71 (SRl). The keyboard information read in a certain period is read out by clock pulse φ1 at Tφ1=Tφ2/n, for example, n=7.
) is sequentially sent to the serial-in-parallel-out shift register 72 (SR2). The contents of the shift register 72 are written into the buffer register 74 (BFl) at the same time as this forwarding by the clock pulse φ2.
The digital signal indicating the performance state of each key read out to the shift register 71 in the next cycle of the clock pulse φ2 is combined with the digital signal indicating the performance state of each key in the previous cycle, ie, the contents of the shift register 72, in the exclusive OR gate 73. Each corresponding key is compared bit by bit. In this comparison 1
If the bits do not match, the exclusive-OR gate 73 produces an output, and this . The output is flip-flop 75 (FF
) is temporarily stored. In other words, 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. means.
The output terminal of the flip-flop 75 is 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 become that event bit. become. For example, for simplicity, exclusive or gate 73
The 16-bit digital signals are compared and the result is R
Assuming that OOOlOOOOOOOOOOOOj,
The memory contents of the flip-flop are ROOOllllllll
This means that the final r1yo has been memorized. 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 may be temporarily stored in another shift register (not shown) for each 16 bits (block). As can be seen, in this case, the information in the shift register a 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 to not only the event output of the keyboard event detection circuit 62 but also the events 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 detection circuits 63, 64, and 65 are led, and the result of the OR logic is sent to the AND gate 67.
is output as a storage request signal, ie, a request store signal 100, in synchronization with clock pulse φi.

Further, a counter 61 is provided which is driven by a clock pulse φ2 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 the clock pulse φ2, which is 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 out from each of the detection circuits 62 to 65. In this way, the counter 61 is reset by the occurrence of the event signal, and then the clock pulse φ
2, and the count value immediately before being reset again upon generation of the next event signal corresponds to the time from the generation of the previous event signal to the generation of the current event signal. The count value of the counter 61 represents the elapsed time since the previous event signal was generated. In this way, performance information (for example, 51
2 bits) is detected.

The control processor 92 (CP) is driven by the request store signal 100 based on the event detected as described above.

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-only memory 91 (ROM). Therefore, the value of the program counter can be arbitrarily set using an external signal. That is, the control processor 92 (CP) sends a request to the first-in-first-out memory 93 (FIFOl) using the command signal 112 in accordance with the command of the read-on memory 91 (ROM) in which information processing procedures or commands are stored in advance. When the store signal 100 is received, the event relative time 101 of the counter 61 and the content 102 of the buffer register 74
Among the contents 103 to 105 of the other detection circuits 63 to 65, r1 in the shift register in which detection results of every 16 bits are stored is stored as a word corresponding to a certain bit. Each time this storage is completed, the counter 61 and flip-flop 75 are cleared by the clear pulse CPI, and one sequence of checks is completed. The above-described detection and storage operation is repeated throughout the entire playing process of the electronic musical instrument 1. F
The IFOl 93 is a type of temporary storage device that sequentially outputs the information inputted first, and the control processor 92 periodically transfers the stored information 110 to the cassette tape memory 9 each time the storage contents of the FIFOl 93 reach a predetermined amount.
Memories 93 and 94 are controlled by command signals 112 and 113 so as to transfer data to 4. In this way, all performance information is stored on the cassette tape in the cassette tape memory 94 in a compressed format, 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., compressed information data format).

In this case, the irregularly compressed information is stored in a simple memory 94 capable of long-term storage, and the FI
Providing FO 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 cost is clear. The above is the configuration and operation of the system for pressure detection and storage of digital performance information.Next, the configuration and operation of the system for reproducing the stored digital performance information will be described.

In the cassette tape memory 94, compressed digital performance information is stored in the cassette tape memory 94 as shown in FIGS. 6a and 6b.
Event relative times ΔT1 to ΔTnl are stored in the form of event matrices 1 to n, including an event check word that indicates the address of the buffer register where the event occurred, and a status word that indicates the contents of the buffer register when the event occurred. There is.

These event matrix information 111 are sequentially and regularly stored in the first-in first-out buffer memory 95 (F
IFO2). This reading operation is controlled by the control processor 92 using command signals 113 and 11.
4 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 11 of keyboard-related pitches.
6. 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 83
(BF4) contains tone lever-related tone information 118,
Parallel in-parallel out buffer register 84
Expression pedal-related volume information 119 can be read out from (BF,), and event relative time information 120 can be read out from the counter 85 (CT3). Control processor 92 reads commands from memory 91 and outputs command signals 113, 114, 11.
5, memories 94, 95 and counter 88 (C
T2) and shift control register 90 (SCR)
control.

Serial in-parallel out shift register 86 (
SR4) This is provided to perform modifications such as automatic key transposition and tempo changes, which will be explained later.
) is for buffering when transferring keyboard information to an electronic musical instrument. The AND gate 89 controls the supply of the clock pulse φ3 in accordance with the command signal read out to the shift control register 90, and its output signal 125 becomes a shift control signal for the shift registers 86 and 87 and is simultaneously counted by the counter 88. Counter 88 clears register 90 with its ripple clock signal 127. In order to reproduce the performance information, first, the signal of the event relative time ΔT1 is input to the counter 85.
(CT3), and this counter 85 is counted down by clock pulse φ2.

This counter 85 is decremented by the clock pulse φ2, and sends a signal (underflow signal) whose content becomes RO to the control processor 92 as an information request signal, that is, a 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 a parallel-in/serial-out shift register 87 (SR) and buffer registers 82 to 84 having the corresponding address. (B
The memory 95 is instructed to write the status word in F3 to BF5). Further, the counter 85 similarly counts down the event relative time ΔT2, and waits until the content reaches zero in the register 87 that has been written.
, 82 to 84 are retained. In this way, by counting the event relative time using the counter 85 to detect an event, and reading the status word containing the event bit corresponding to the event,
It becomes possible to reproduce information related to pitch, tone, effect, and tempo. Shift registers 86 and 87 have four operating modes: clock inhibit, right shift, left shift, and parallel load, and these are controlled independently by a signal 128 from shift control register 90.

Furthermore, during the operation mode of the shift registers 86 and 87, (a)
Clock inhibit is a state in which the clock input is interrupted and the data contents do not change. (2) Right shift is a state in which data is shifted to the right. (3) Left shift is a state in which data is shifted to the left. (d) Parallel load indicates a state in which parallel data is input from the outside. Now, to describe the operation of transferring the keyboard information 124 to the buffer register 81, (1
) Parallel load the shift register 87, (2) write a status word as predetermined information to the shift register 87, (3) write the number of bits to be transferred to the counter 88, that is, the number of bits of the shift registers 86 and 87, and Shift control register 90 places shift registers 86, 87 in a right-shift mode and enables counter 88 to count down. This transfer and counter is performed by clock 125.

In this case, when the transfer ends and the counter 88 reaches O, the generated ripple clock signal 127 clears the shift control register 90, and the counter 88 and shift register 86
, 87 are stopped. The above operations are related to faithful reproduction, but if modulation-modified reproduction is required, the following may be performed. First, let us 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 operations (1) to (3) described above. 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 only necessary to shift the contents of the shift register 86 to the right by one bit. That is, shift register 8
Depending on whether the content of 6 is bit-shifted to the right or left, it is determined whether the modulation is carried out to the treble side or to the bass side, respectively. Therefore, in order to perform a predetermined modulation, following the operations (1) to (3) described above, (4) writing a predetermined shift number (number of degrees to be modulated) to the counter 88 (5) The mode of the shift register 86 is set to right shift or left shift according to a predetermined modulation direction, the shift register 87 is set to a clock inhibit mode, and the counter 88 is set to a clock inhibit mode.
should be made countable. Also, shift register 8
By rearranging the contents of 6 in the completely opposite order, it is possible to obtain a very special effect, as if the left and right of the keyboard were played in completely reversed order, and this is called reverse keying.

If this forward modulation is necessary, the shift register 87 is set to the right shift mode and the shift register 86 is set to the left shift mode in (3) above, and the same operations are 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 a song, it is sufficient to change the event relative time ΔT regarding 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 φ2 of the 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 φ2 to the counter 85 is increased, the request data 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 92
The same purpose can be achieved by multiplying the event relative time ΔT by an arbitrary constant α and writing the value ΔD=αΔT 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, tone, and effects are stored in buffer registers 8, respectively.
3, 82, and 84 are read out at each change (event) timing indicated by the relative time signal.

After all, each buffer register 81 to 84 reproduces the digital performance information of the corresponding operator of the electronic musical instrument.
By periodically distributing and supplying the contents of each register to the corresponding contacts Y1 to Y4 using a clock pulse φ2, it becomes possible to reproduce musical tone information corresponding to stored performance information through the electronic musical instrument 1.

In the above embodiment, instead of the memory 94, a disk,
It goes without saying that a known storage device such as a semiconductor memory, magnetic tape, or optical card can be used, and the internal logic circuit configuration of the information processing device (2) is not limited to the above embodiments, but can be changed to a Boolean as desired. Various circuits that can be solved by algebra can be substituted.

Furthermore, it will be obvious that a known computer can be applied to the information processing device (1) 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 operator, extremely faithful performance reproduction is possible, and modification reproduction can also be performed as appropriate.

(2) By digitally processing a huge amount of performance information as compressed information, the performance capacity of the performance information storage device can be reduced. (3) By extracting digital performance information from all the operators, it is possible for even an amateur to reproduce fully automatic performance of an electronic musical instrument that requires no hand from the performer during playback.

(4) During playback, for example, you can set 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. Other performers can provide the electronic musical instrument with performance information that is not automatically reproduced, thereby assisting performance practice, composing, or arranging activities.

The automatic performance device of the present invention having such effects is as follows:
For example, it is extremely useful for application to unmanned demonstration performances of electronic musical instruments, simulation of electronic musical instruments, performance training systems for electronic musical instruments, and the like.

[Brief explanation of the drawing]

FIG. 1 shows an automatic performance device for an electronic musical instrument according to the present invention.
A block diagram showing an embodiment, FIGS. 2a and 2b are block diagrams of an A-D converter for an angular displacement member used in the above embodiment, and FIGS. 3a and 3b are a block diagram of an A-D converter for an angular displacement member used in the above embodiment. The detailed configuration diagram includes the top view of the code board and its ■B-■
4a and 4b are a sectional view taken along line B, and FIG. 4 is a wiring diagram of an analog electronic switch circuit used in the above embodiment. FIG. 5 is a block diagram showing details of the performance information processing device of the device shown in FIG. 1. , FIGS. 6a and 6b are diagrams for explaining the information processing operation of the apparatus shown in FIG. 5. 1...Electronic musical instrument, ■...Performance information processing device, 1...
・Tone generator, 2...Electronic switch for keyboard,
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... counter, 71, 72, 74,
81 to 84, 86, 87, 90...shift register,
62-65...Event detection circuit, 73...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, 133,
143... Switching circuit, 150... Rotating shaft,
151... Code plate, 154... Sliding member, 160
a, 160b...Nand gate.

Claims (1)

[Claims] 1. Digital performance information corresponding to the displacement of a plurality of operators is stored in a compressed form into a digital signal that includes the change when the performance state changes and a relative time signal that indicates the relative time between the changes. a storage device; a device that reads the relative time signal from the storage device and generates an event signal in accordance with the arrival of the timing of change; and a timing of change indicated by the event signal each time the event signal occurs; a buffer memory for reading and storing a digital signal corresponding to the storage device from the storage device, and a device for reproducing musical instrument sounds according to the digital signal stored in the buffer memory,
An automatic performance device characterized in that musical instrument performance sounds are reproduced using digital performance information stored in a compressed form.