JPH0271294A - Automatic accompanying device for electronic musical instrument - Google Patents

Abstract

PURPOSE:To naturally control automatic accompaniment rich with music by detecting key touch accompanied with musical performance to insert a fill-in pattern. CONSTITUTION:A key touch detecting device 911 and an accompaniment pattern memory are provided, and the device 911 detects that the strength of the key touch to a keyboard exceeds a prescribed value, and plural accompaniment patterns (including fill-in patterns) are stored in this memory, and an accompaniment pattern other than fill-in patterns is normally read out from the memory, but a fill-in pattern is read out from the memory only for a prescribed time when it is detected that the strength of the key touch exceeds the prescribed value. Insertion of fill-in patterns is controlled in accordance with the strength of the key touch. Thus, fill-in patterns are inserted without hindering musical performance to resolve the monotonousness of automatic accompaniment.

Description

[Detailed Description of the Invention] [Field of the Invention] The present invention relates to an automatic accompaniment device for an electronic musical instrument, and in particular to an automatic accompaniment device that detects a key touch state caused by a performance and performs fill-in control according to the key touch state. Regarding equipment.

[Background of the Invention] Conventionally, in automatic accompaniment devices for electronic musical instruments, odrhythm,
In order to eliminate the monotony of automatic accompaniment such as auto chords and auto bass, fill-in switches and pattern selection switches are installed on the operating surface of electronic musical instruments.By operating these switches during a performance, you can switch to the normal pattern for a certain period of time and perform fill-in switches. There are known devices that perform automatic performance based on patterns or that provide variations to automatic accompaniment.

By the way, in such an automatic accompaniment device for an electronic musical instrument, in order to insert a fill-in pattern, it is necessary to operate the fill-in switch even while playing the keys, and it is difficult to operate this switch without interfering with the performance. There was this inconvenience.

[Purpose of the Invention] The present invention was made in view of the above-mentioned problems with the conventional type, and is an automatic accompaniment device for an electronic musical instrument that detects key press touches associated with a performance and performs accompaniment based on the touch output. To provide an automatic accompaniment device which eliminates the monotony of automatic accompaniment by making it possible to insert a fill-in pattern without hindering the performance, based on the concept of automatically changing patterns.

[Structure of the Invention] In order to achieve the above object, the present invention includes a key touch detection device that detects when the strength of a key press touch on a keyboard exceeds a predetermined value, and a plurality of accompaniment bangs (including fill-in patterns). ), and accompaniment patterns other than the fill iso pattern are normally read out, but if it is detected that the strength of the key touch exceeds a predetermined value, the fill-in pattern is read out for a predetermined period of time. The present invention is characterized in that the insertion of the fill-in pattern is controlled according to the strength of the key press touch.

[Explanation of overall configuration of embodiment] Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 shows a block configuration of an electronic musical instrument to which an automatic accompaniment device according to an embodiment of the present invention is applied.

In the figure, a keyboard section 1 (IU, IL) consists of an upper keyboard IU for playing melodies and a lower keyboard IL for playing chords. These upper keyboard IU and lower keyboard IL each have a large number of arranged key switches and generate key data UKKC and LKKC representing pressed keys.

The initial touch sensor 2 and the aftertouch sensor 3 detect the state of a key pressed on the keyboard section 1. The initial touch sensor 2 detects the speed at which a key is pressed, that is, the touch strength, and sends an initial touch signal ITS.
The aftertouch sensor 3 detects the key pressing edge after the initial touch, that is, the strength of the aftertouch, and generates an aftertouch signal ATS.

The accompaniment pattern memory 4 stores five types of accompaniment including one type of normal pattern, three types of variation patterns, and one type of fill-in pattern, corresponding to each rhythm type selected by the rhythm type selection switch 5. Memorize patterns. The accompaniment pattern includes rhythm pattern data RP for controlling the types of percussion instruments that make up the rhythm sounds and their sound timing, chord pattern data CT for controlling the sound timing of automatic chord sounds, and the sound timing and timing of automatic bass sounds. It includes base pattern data BT, etc. for controlling the base development of. These accompaniment patterns are
Rhythm type selection data R8 from the rhythm type selection switch 5 and count output H from the counter 7, which will be described later.
The pattern change data FIL, VARI, VAR2, and VAR3 from the accompaniment pattern change control circuit 9 are read out from the accompaniment pattern memory 4 as addressing data.

The tempo oscillator 6 is composed of, for example, a variable frequency oscillator,
An oscillation output, that is, a tempo pulse TP is supplied to the counter 7. The counter 7 counts the tempo pulses TP and provides the counted value HN to the accompaniment pattern memory 4 as address designation data. Therefore, the tempo pulse TP
The period of this automatic performance, that is, the tempo of successive accompaniment patterns is determined. The counter 7 further generates tempo pulses TP for the number of beats depending on the rhythm type, such as 3 beats or 4 beats.
The carrier output Co is outputted as a bar pulse every time it is counted.

The mode selection switch 8 is used to select the fill-in pattern insertion or accompaniment pattern change mode to be performed by this automatic accompaniment device according to the state of touch on the key.In this embodiment, the following modes 1 to 5 are selected. One of five modes can be selected.

Mode 1: When the instantaneous touch strength (touch strength instantaneous value) of the initial touch exceeds a predetermined threshold, a fill-in pattern is inserted from that point to the beginning of the next measure.

Mode 2 When the instantaneous touch strength of the near-after touch exceeds a predetermined threshold, a fill-in pattern is inserted from that point to the beginning of the next measure.

Mode 3 When the strength of the near aftertouch exceeds a certain value and continues for a certain period of time, a fill-in pattern is inserted into the next measure.

Mode 4: When an initial touch average strength (integral value) signal is generated, the accompaniment pattern is changed to correspond to this signal level.

Mode 5 When a near-aftertouch average strength (integral value) signal is generated, the accompaniment pattern is changed to correspond to this signal level.

The accompaniment pattern change control circuit 9 detects the key touch state on the keyboard section 1 based on the outputs of the initial touch sensor 2 and the aftertouch sensor 3, and inserts a fill-in pattern or changes the accompaniment pattern according to the mode selected by the mode selection switch 8. Control change. This control data FIL and VAR1 to VAR3 are stored in the accompaniment pattern memory 4.
is given as addressing data.

The melody musical tone forming circuit 10 generates a melody tone signal having a pitch corresponding to the key data U and KKC from the upper keyboard IU and a volume, tone quality and note length corresponding to the signals ITS and ATS from each touch sensor 2 and 3. form. This melody tone signal is an accompaniment tone signal, that is, a chord signal formed by the chord tone forming circuit 11, a bass tone signal formed by the bass tone forming circuit 12, and a rhythm percussion tone forming circuit 13.
is mixed with the percussion instrument sound signal formed by the amplifier 1.
4 and the speaker 15.

The chord detection circuit 16 detects the root note and chord name (major, mica, seventh, etc.) of the chord played on the lower keyboard IL based on the plurality of key data LKKC from the lower keyboard IL, and detects the root note data RT. .

Output chord name data CN.

The bass note key data forming circuit 17 includes the chord detection circuit 16
For the root note data RT from Sound key data BKC is formed and outputted at the timing of base pattern data BT from memory 4.

The chord tone forming circuit 11 forms musical tones corresponding to each of the plurality of key data LKKC from the lower keyboard IL,
A chord signal formed by acoustically mixing these musical tones is output every time a chord timing pulse CT from the accompaniment pattern memory 4 is input.

The bass tone musical tone forming circuit 12 forms a bass tone according to the bass tone key data BKC inputted from the bass tone key data forming circuit 17.

The rhythm percussion sound forming circuit 13 includes an accompaniment bang memory 4
Percussion instrument sounds are formed based on rhythm pattern data RP sent out for each type of percussion instrument.

(Detailed Operation of Accompaniment Pattern Change Control Circuit 9) Next, the detailed operation of the accompaniment pattern change control circuit 9 will be described with reference to FIG.

When a keyboard is played on this electronic musical instrument, signals ITS and ATS are supplied from the initial touch sensor 2 and the aftertouch sensor 3 (FIG. 1) to the accompaniment pattern change control circuit 9 in accordance with the state of touch on the keyboard. Ru. Further, depending on the selection of one of modes 1 to 5 by the mode selection switch 8 (FIG. 1), one of the bits becomes “
5-bit mode selection data of 1'' is supplied.

Furthermore, a bar pulse Co is supplied from the counter 7 at the beginning of each bar.

The instantaneous touch strength threshold comparison circuit 911 compares the initial touch signal ITS from the initial touch sensor 2 with a predetermined threshold and generates an output “1” when the initial touch strength (instantaneous value) exceeds the predetermined value. do. When mode 1 is selected, the moto selection signal MOD I is "1", so the output "1" of the comparison circuit 911 is given as a set input to the hold circuit 914 via the AND gate 912 and the OR gate 913. , hold circuit 9
14 generates an output FIL="1". On the other hand, the measure pulse Co from the counter 7 (FIG. 1) is delayed by one clock time in a delay circuit, for example, a delayed flip-flop 915, which is driven by the system clock φ that drives the entire electronic musical instrument, and then held in a hold circuit 914. is given as a reset input. Therefore, hold circuit 9
14, the output FIL is "1" from the time when the initial touch strength exceeds the threshold value until the beginning of the next measure. This output FI
L="1" is applied to the accompaniment pattern memory (FIG. 1), and the fill-in pattern is read out in the memory 4 using the control data of FIL="1" as address designation data.

When mode 2 is selected, the instantaneous touch strength threshold comparison circuit 921 operates in the same manner as the comparison circuit 911 described above regarding the aftertouch signal ATS from the aftertouch sensor 3, and the output "1" of this comparison circuit 921 indicates the mode selection. When signal MOD2-“1”, that is, mode 2 is selected, hold circuit 914 is set via AND gate 922 and OR gate 913.

Therefore, when mode 2 is selected, the control output FIL becomes "1" from the time when the aftertouch strength exceeds a predetermined threshold until the beginning of the next measure, and the fill-in pattern is read from the accompaniment pattern memory 4.

When mode 3 is selected, the duration measurement circuit 931 detects the aftertouch signal ATS.
The time during which the level of is above a certain value is measured, and when this time reaches a certain time, an output "1" is generated. The hold circuit 932 is set by this output "1", and the output Q
="1" is generated.

AND gate 933 has one input as this output Q="1"
is applied, and the bar pulse Co is applied to the other input. Therefore, when the first bar pulse Co="1" is input after the output Q becomes M1'', the AND gate 933 generates a pulse output "1". Also, this bar pulse C
o="1" is delayed by one clock time by the aforementioned delay circuit 915 and then applied to the reset terminal of the hold circuit 932. Therefore, this hold circuit 932 is reset immediately when the AND gate 933 generates a pulse output "1" by the first bar pulse after setting. If mode 3 is selected and the mode selection signal MODB is "1", this pulse output "1" is output from the AND gate 934.
A hold circuit 914 is set via an OR gate 913.

As described above, the hold circuit 914 is reset by the first measure pulse Co after setting, so if mode 3 is selected and the aftertouch strength is above a certain level and continues for a certain period of time, the next hold circuit 914 is reset. 1 measure output FIL
="1" is generated, and the fill-in pattern is read out from the memory 4.

When mode 4 or 5 is selected, the average touch strength detection circuit 941 integrates the initial touch signal ITS and generates an output at a level corresponding to the average strength of the initial touch. A level comparator 942 compares the output level of the detection circuit 941 with three reference levels: high, medium, and low, and generates a 3-bit output depending on the output level. That is, if the output level of the detection circuit 941 is lower than the reference level (small), "0" is output to all bits, and if it is higher than (small) but less than (medium), "1" is output to only the first bit.
(Medium) or more but less than (Large), only the second bit is “1”
(Large) In the above, "1" is output only to the third bit. Average touch strength detection circuit 951 and level comparator 952
operates in the same manner as the average touch strength detection circuit 941 and the level comparator 942, except that it operates based on the aftertouch signal ATS, and all bits are 0 or the first to
Only one of the three bits generates a "1" output.

The selector 943 connects the level comparators 942 to 3 to the A input.
Bit's initial touch average strength pig is given, B
3-bit aftertouch average strength data is provided from input level comparator 952, while mode selection signals MOD4 and MOD5 are input as input selection signals SA and SB, respectively. Therefore, when the moto selection signal MOD4 is "1", the selector 943 selects and outputs the A input. The outputs VAR1 to VAR3 of the selector 943 are given to the accompaniment pattern memory 4 as accompaniment pattern change control data. As a result, when mode 4 is selected, while the initial touch average strength signal is being generated, the average initial touch strength among the three variation patterns stored in the memory 4, that is, the control data VAR1~ A pattern corresponding to 3 is played. In addition, when mode 5 is selected, the mode selection signal MOD
5="1" is given to the selector 943 as the B input selection signal SB, and the selector 943 selects and outputs the output of the level comparator 952. That is, in this case, accompaniment pattern change control data VAR1 to VAR3 corresponding to the average strength of aftertouch are given as accompaniment pattern change control data VAR] to 3, and as a result, accompaniment pattern change control data VAR1 to VAR3 corresponding to the average aftertouch strength are stored in the accompaniment slam memory 4. While the signal is being generated, a variation pattern corresponding to this average strength is read out. Note that even if mode 4 (or 5) is selected, the average touch strength detection circuit 941 (
or 951) output from the level comparator 942 (or 951).
52), the comparator output, that is, the control data output from the selector 943, is all bits "0".
Needless to say, if this is the case, the change to the variation pattern is not performed, and the normal pattern continues to be played. In addition, when none of modes 1 to 5 is selected, and even if moto 1 to 3 are selected, if the fill-in control signal FIL is "0" in these modes 1 to 3, it is still normal mode. The pattern is played.

In the above embodiment, the instantaneous value or average value of the touch strength or the combination of the touch strength and time is detected to change the pattern or perform fill-in control. It is also possible to change the pattern and perform fill-in control depending on the frequency of strength. Furthermore, it is also possible to change the pattern and control fill-in by detecting the left-right movement of the key with a sensor.

[Effects of the Invention] As described above, in this invention, a fill-in pattern is inserted by detecting a key touch accompanying a performance.
The key touches that accompany this performance originally add changes to the flow of music, and on the other hand, inserting fill-in patterns also adds changes to the flow of music, so according to this invention, musicality can be easily achieved. Rich automatic accompaniment control becomes possible.

FIG. 1 is a block diagram showing the configuration of an electronic musical instrument to which an automatic accompaniment device according to an embodiment of the present invention is applied, and FIG. 2 is a detailed block diagram of an accompaniment button change control circuit in the electronic musical instrument of FIG. 1.

1U...Upper keyboard, IL...Lower keyboard,
2...Initial touch sensor, 3...
...Aftertouch sensor, 4...Accompaniment pattern memory, 8...Mode selection switch,
9... Accompaniment pattern change control circuit, 10...
...Music sound formation circuit for melody, 11...Musical sound formation circuit for chord, 12...Musical sound formation circuit for bass note, 13...Percussion instrument sound formation circuit for rhythm. .

Claims (1)

[Claims] 1. A large number of key switches constituting a keyboard, a key touch detection means for detecting when the strength of a key press on the keyboard exceeds a predetermined value, and a plurality of key switches including a fill-in pattern. An accompaniment that stores an accompaniment pattern, reads an accompaniment pattern other than the fill-in pattern during normal automatic accompaniment, and reads the fill-in pattern only for a predetermined period when it is detected that the strength of the key touch exceeds a predetermined value. An automatic accompaniment device for an electronic musical instrument, comprising: a pattern memory; and a musical tone forming circuit that forms musical tones based on key data representing keys pressed by a keyboard performance and the accompaniment pattern data.