JPH0271295A - 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 control the change of an accompaniment pattern. CONSTITUTION:A key touch detecting means 941 and an accompaniment pattern memory are provided, and the means 941 detects an average strength of key touch to a keyboard, and plural accompaniment patterns (including variation patterns) are stored in this memory, and an accompaniment pattern other than variation patterns is normally read out from the memory, but a variation pattern corresponding to the average strength is read out from the memory when a key touch average strength signal is detected. The change of an accompaniment pattern is controlled in accordance with the average strength of key touch. Thus, accompaniment patterns are changed 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 detects a key touch state caused by a performance and controls accompaniment pattern change according to the key touch state. This invention relates to an automatic accompaniment device.

[Background of the Invention] Conventionally, in automatic accompaniment devices for electronic musical instruments, fill-in switches and pattern selection switches are provided on the operating surface of the electronic musical instrument in order to eliminate the monotony of automatic accompaniment such as autorhythm, autochord, autobass, etc. It is known that by operating these switches during a performance, automatic performance is performed using a fill-in pattern instead of the normal pattern for a certain period of time, or variations are provided to automatic accompaniment.

By the way, in such automatic accompaniment devices for electronic musical instruments, in order to change the pattern, it is necessary to operate the pattern selection switch even while playing the keys, and it is difficult to operate this switch without interfering with the performance. there were.

[Purpose of the Invention] This invention has been 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 during performance and performs accompaniment based on the touch output. To provide an automatic accompaniment device that eliminates the monotony of automatic accompaniment by making it possible to change accompaniment patterns without hindering 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 means for detecting the average strength of key presses on a keyboard, a key touch detection means that stores a plurality of accompaniment patterns (including variation patterns), and a normal Accompaniment patterns other than variation patterns are read out, but when an average strength signal of key touches is detected, a variation pattern corresponding to the average strength is read out. The present invention is characterized in that the accompaniment pattern is controlled to be changed depending on the performance.

[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 1L each have a large number of key switches arranged 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. Contains base pattern data BT, etc. for controlling the base expansion of . These accompaniment patterns are based on the rhythm type selection data R from the rhythm type selection switch 5.
3 and count output HN from 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
This automatic performance, that is, the accompaniment pattern reading tempo is determined by the period of . 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. 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. The control data FIL and VARI~3 are given to the accompaniment pattern memory 4 as address designation data.

The melody musical tone forming circuit 10 generates a pitch corresponding to the key data UKKC from the upper keyboard IU and each touch sensor 2.
, 3 is formed into a melody sound signal having a volume, tone quality, and note length corresponding to the signals ITS and ATS from the melody signals ITS and ATS. This melody sound signal is an accompaniment sound signal, that is, a chord signal formed by the chord sound forming circuit 11, a bass sound signal formed by the bass sound forming circuit 12, and a percussion instrument sound formed by the rhythm percussion sound forming circuit 13. The signal is mixed with the amplifier 14.
and is sounded through the speaker 15.

The chord detection circuit 16 detects the root note and chord name (major, mica, 7th, etc.) of the chord played on the lower keyboard IL based on the plurality of key data LKKC from the lower keyboard IL, and converts 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 instrument sound forming circuit 13 forms percussion instrument sounds based on rhythm pattern data RP sent from the accompaniment pattern memory 4 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.

When mode 1 is selected, 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 determines whether the initial touch strength (instantaneous value) exceeds the predetermined value. An output “1” is generated. When mode 1 is selected, the mode selection signal MODI 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 is "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 value, 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 "1", 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 MOD3 is "1", this pulse output "1" is output from the AND gate 93.
4 and a hold circuit 914 via an OR gate 913
Set.

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.

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 only to 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 9
52 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 only 1 bit among the 1st to 3rd bits is 0. Generates an output of “1”.

The selector 943 connects the level comparators 942 to 3 to the A input.
Bit's initial touch average strength data is given,
The 3-bit aftertouch average strength data is provided from the B input level comparator 952, while the manual selection signal SA
Mode selection signals MOD4 and MOD5 are input as SB and SB, respectively. For this reason, the selector 943
selects and outputs the A input when the moto selection signal MOD4 is "1". Output VAR1 to 3 of this selector 943
is 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. Furthermore, when mode 5 is selected, the mode selection signal MO
D5="1" is applied to the selector 943 as the B input selection signal SB, so that 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 aftertouch strength are given as accompaniment pattern change control data VAR1 to VAR3, so that the accompaniment bang memory 4 receives the aftertouch average strength signal. While this occurs, 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) is smaller than the reference level (lower) of level comparator 942 (or 952) and the comparator output, that is, the control data output from selector 943, is
Needless to say, if it is 0, no change to the variation pattern is made, and the normal pattern continues to be played. Furthermore, 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 or perform fill-in control depending on the frequency of the 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, the accompaniment pattern change is controlled by detecting the key touches that accompany the performance, but the key touches that accompany the performance originally do not affect the flow of the music. On the other hand, since the bang change also adds a change to the flow of music, according to the present invention, automatic accompaniment control that is naturally rich in musicality becomes possible.

[Brief explanation of the drawing]

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 the average strength of key presses on the keyboard within a predetermined period, and a plurality of accompaniment patterns including variation patterns. an accompaniment pattern memory in which an accompaniment pattern other than the variation pattern is read out during normal automatic accompaniment, and a variation pattern is read out in accordance with the average strength of the key touch when a signal of the average strength of the key touch is detected; An automatic accompaniment device for an electronic musical instrument, comprising: 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.