JPS60247696A - Automatic rhythm performer for electronic musical instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an automatic rhythm performance device for an electronic musical instrument that performs automatic rhythm performance in accordance with chord performance.

[Prior art]

In recent years, in order to vary the automatic rhythm performance, an automatic rhythm performance device has been proposed that performs rhythm performance based on a fill-in rhythm pattern at predetermined intervals instead of rhythm performance based on a normal rhythm pattern (first conventional example). Furthermore, if there is a change in the key operation on the keyboard within a predetermined period, the rhythm performance based on the normal rhythm pattern is continued; on the other hand, if there is no change in the key operation, the rhythm performance is performed based on the fill-in rhythm pattern. There is a device designed to do this (second conventional example).

There is a device that changes the pattern and performs rhythm performance by automatically outputting a variation pattern when a nine-tone chord continues for a long time without operating a variation switch (third conventional example).

[Problems with conventional technology]

In the case of the above-mentioned first conventional example, the fill-in rhythm is automatically inserted regardless of the performance content of the song, so the fill-in rhythm may not go where it should go, or it may end up in the wrong place. Therefore, there is a problem that the content of the song may not match the content of the song.

In addition, in the case of the second and third conventional examples, it is actually rare that the chord or accompaniment key maintains the same chord for a long time.
There is a problem that the practical effect is small.

[Purpose of the invention]

An object of the present invention is to provide an automatic rhythm playing device for an electronic musical instrument in which a rhythm pattern changes extremely naturally according to a phase tone performance.

[Key points of the invention]

Detects and stores the degree of change in the chord discrimination signal in response to key operations on the accompaniment keyboard, and also detects the degree of change between the chord discrimination signal of the chord specified a predetermined period ago and the chord discrimination signal of the chord specified this time. Furthermore, by providing a chord change pattern storage circuit for storing patterns in which chords change, the rhythm pattern can be switched in accordance with changes in chords.

〔Example〕

The present invention will now be described in detail with reference to FIGS. 1 to 5. In FIG. 1, l is a tempo oscillator,
A tempo clock having a frequency corresponding to the setting of a tempo volume (not shown) is given to the tempo counter 2 to drive it. The output signals 01 to C5 of the counter 2 are applied to address input terminals A1 to A5 of the rhythm pattern storage circuit 3.

The output of each key of the accompaniment keyboard 4 is a chord discrimination signal generation wave [5E
Thus, for example, CD'laJ s D7, F'rnt
The signal is converted into a chord discrimination signal such as "n", and is supplied to a chord progression determination circuit 6 and an accompaniment sound source circuit (not shown).

For strings, the chord discrimination signal is shown in Figure 3 +11, (21
As shown in the figure, it consists of 7-bit data D6 to Do.

The upper three bits (D6 to D4) represent the chord type, and the lower four bits (D3 to Do) represent the root name.

The chord progression determination circuit 6 detects chord progression by looking at changes in the contents of the supplied chord discrimination signal, outputs the detection signal from the output terminals S1 * S2 e S3, and outputs the detection signal to the address input terminal A6 # of the rhythm pattern storage circuit 3. A7
It is applied to +A8 and changed to a fill-in or variation rhythm pattern. Further, control such as cancellation of pattern change is also performed by a carry signal from the counter 2 generated at the break of each bar.

Address input terminal A9' of rhythm pattern storage circuit 3
A rhythm type selection signal (3 bits) such as rock or waltz selected by a rhythm selection switch (not shown) is input to eAIO's A11. and output terminal 0
From 1 to 08, the stored multi-terminal AI ""'A
Rhythm pattern data specified by the input signal to ll is read and output, and drives rhythm sound sources such as drums, congas, cymbals, etc. in the rhythm sound source circuit 7. Each rhythm sound source signal is emitted as a rhythm accompaniment sound via an amplifier and a speaker (not shown).

Next, a specific circuit of the chord progression determining circuit 6 will be explained with reference to FIG. In the figure, reference numeral 8 denotes a chord storage circuit which also receives a signal CDQ as the chord discrimination signal, a signal CDO indicating the type of the current chord, and a signal RTO indicating the root note. The chord storage circuit 8 outputs signals RTI and CDI indicating the root note and type of the previously stored chord, respectively. This signal RTI is the root note comparison calculation circuit 9a.
, code storage circuit 11a, and input to the comparator 10.

Further, the signal CDI is input to the input terminal A1 of the code comparator 13.
．． code change storage circuit 12a, code comparator 1
0 compares the currently designated code with the output from the code storage circuit 8 and outputs a signal DF when they do not match. This signal DF is applied to the code storage circuit 8. It is output as a storage signal to the code change storage circuit 12a. The root note comparison calculation circuit 9''a calculates the difference between the root note of the currently designated chord and the signal RTI, and outputs a root note change signal DVI, and this signal DVI is sent to the chord change storage circuit. 12a.This food change memory circuit 1
2a is a signal DV2 obtained by storing the signals DVI and CDI as the signal DF.

KD2 is connected to the input terminal AZ eA3 of the code comparator 13.
+ and output to the code change storage circuit 12b.

This code change storage circuit 12b performs a storage operation using the signal DF, and the output of this code change storage circuit 12b is connected to the input terminal A4 e A5 of the code comparator 13.
Enter. On the other hand, the output signals RT2 and CD2 of the code storage circuit 11a are input to the code storage circuit 11b at the next stage, and this code storage circuit 11b receives the signals RT3. C
Output D3.

Thereafter, five stages of code storage circuits are connected, and the output signals FLT7 and CD7 of the code storage circuits 1 and 1f at the last stage are respectively applied to the root note comparison calculation circuit 9b and the input terminal A7 of the comparator 13.
Enter. The code storage circuit 11a...l
lf performs a storage operation using a clock α output every bar. The root note comparison calculation circuit 9b receives the signal RTI.
is input, the difference between this signal RT1 and the signal RT7 is calculated, and a signal DV7 is outputted, and this signal DV7 is inputted to the input terminal A6 of the code comparator 13-.

On the other hand, 14 is a counter driven by a high-speed clock φ, and its counting output is output from the output terminal ClIC2wC5.
output from the input terminal Bl of the latch 15.

B2#B3 and input terminals AI, A2, and A3 of the chord change pattern storage circuit 16, respectively. The chord change pattern storage circuit 16 stores eight types of chord change patterns, and has input terminals Al, A2, A3.
The pattern data CPT corresponding to the input to the code comparator 13 is outputted and applied to the input terminal B of the code comparator 13. The code comparator 13 compares the data on both input terminals Al-A7 and B, and when they match, it outputs a match signal SM of g''1# and supplies it to the latch 15 to perform a latching operation.The latched data of the latch 15 is It is outputted as a rhythm pattern selection signal from the output terminals 81 + 82 + Ss and applied to the address input terminals A6 to A8 of the rhythm pattern storage circuit 3.

Next, the operation of the above embodiment will be explained. First, the main operations of this embodiment will be explained. In this embodiment, in order to recognize chord progression patterns, the degree and type of change in the root notes of the current, previous, and two previous chords are sequentially detected. Furthermore, the degree of change between the root note of the currently specified chord and the root note of the chord specified seven measures before, and the type of the chord seven measures before are detected. By doing this, for example, 1. 1) l) 7 →G7-+Cmaj (C key) b)
B7-+E7 → Amaj (AilN) In a different key, the chords are 粁+-1 as in i) and b) above.
The center of gravity for Waf-Fusu R's Houshun and Ko V's Shui is the same for both, so in both, fill-in sounds are emitted instead of the normal rhythm. However, even in the same key of C, if the chord progression is C) A7 → D7 → Gmaj (CM), the degree of change in the chords a) and c) is the same, but the chord progression is audibly similar to C). When playing a chord progression, it may be a problem if the fill-in sounds.

Therefore, in general, a song is composed of 8-bar units, and chords are also composed of 8-bar units, and the last chord is designated as the resolution chord, and also controls the key of the song in 8-bar units. Take advantage of the fact that this often occurs at the beginning of the first measure. Therefore, the above-mentioned problem is solved by also detecting the change between the currently specified chord and the chord seven measures before.

Prior to automatic rhythm performance, operate the rhythm selection switch to specify one of the rhythm types, such as rock or waltz, and add the rhythm type selection signal to the address input terminals A9 to All of the rhythm pattern storage circuit 3. I'll keep it. Then, when the rhythm start button is turned on, automatic performance starts, and the tempo oscillation if is driven by applying a clock to the counter 2. Therefore, the count output is applied to the address input terminals A1 to A5 of the rhythm pattern storage circuit 3.

On the other hand, a chord accompaniment is performed using an accompaniment keyboard along with the rhythm performance. At that time, the output of the six keys is input to the chord discrimination signal generator 5, and a signal R indicating the root note and type of the corresponding chord is sent.
, TO, and CDO, and the code storage circuit 8 in the hood progress determination circuit 6. Root note comparison calculation circuit 9a, comparator 10
It also sends the signal given to the accompaniment sound source to the accompaniment sound source to generate the chord sound.

A signal RTI indicating the root note previously stored by the code storage circuit 8 is input to the root note comparison calculation circuit 9a.
TI is compared with the current signal RTO, the difference is taken, and the root note change signal DVI is obtained.

The comparator 10 receives the signal RTI previously stored by the code storage circuit 8, the signal CDI indicating the type of code, and the signal holes TO, CI)0. Here, the previous signal hole T1. CDI and this signal RTo, CDo
When the code storage circuit 8. code change storage circuit 12a,
12b respectively to drive. Therefore, the current signals RTo and CDO are newly stored in the code storage circuit 8, and thereafter become the signals RTI and CDI. Also, this signal CDI
The root note change signal DVI is stored in the chord change storage circuit 12a and becomes the signals KD2 and DV2 thereafter, and the previous signals KD2 and DV2 of the chord change storage circuit 12a are
is stored in the code change storage circuit 12b and a new signal KD3. DV3 and the input terminal A of the code comparator 13
1 + A2 # A3 1A4 eA5 respectively.

On the other hand, in the code storage circuit 11a, the signal holes Tl, C
DI is input, and after being newly stored at the clock α output every bar, the signals RT2, CD2! This is then input to the code storage circuit 11b. The clock α is also input to this code storage circuit 11b, and the previous signal RT2°CD2 is stored, and thereafter the signal RT3
, CD3. Thereafter, this operation is repeated, and the chord storage circuit 11f stores the root note and type of the chord 7 measures before the currently specified chord, and the respective signals RT7°C.
It is outputted as D7 and applied to the input terminal A7 of the root note comparison calculation circuit 9b and the code comparator 13.

The root note comparison calculation circuit 9b compares the root note W of the current chord with the root note of the chord one measure before, calculates the difference, and supplies it to the input terminal A6 of the chord comparator 13.

- On the other hand, the code comparator 13 receives input signal signals CDI, DV2 . KD2゜DV3, to
Compare D3-', DV7, CD7 with the signal CPT input to input terminal B, and if they match, 'l#
A match signal 8M is generated, and the count output of the counter 4 at that time is latched in the latch 15. Then, the latch data is sent to the address input terminal A6 *A? of the rhythm pattern storage circuit 3 as a rhythm turn selection signal. e
Since the signal is applied to person B, counter 2 then outputs a carry signal and carries out the signal .
+L-)Zm'7$ff1lul-II Fill-in or variation rhythm pattern data is read out from the output terminals 01 to 08 of the pattern storage circuit 3 in place of the previous normal rhythm pattern data. and is supplied to the rhythm sound source circuit 7. Therefore, during this time, a fill-in or variation rhythm is automatically played in place of the normal rhythm.

The operation of the chord progression determination circuit 6 will be explained in more detail by illustrating a specific chord change using a drum. For example, as shown in FIG. 4, it is assumed that Cmaj is specified in the first measure, and thereafter, Cmaj is specified in the sixth measure D7+7th minor measure G7e and Cmaj in the eighth measure. Input terminal Al”A of code comparator 13
Signals input to 7: CDI, DV2, KD2, DV
3, KD3, DVT, and CD7 are as shown in No. 5111◇In addition, a-yu in the above figure indicates that the calculation was executed in decimal notation.

When the value input to the input terminal A1=A7 of the code comparator 13 matches the pattern data CPT output from the chord progression pattern storage circuit 16, the code comparator 13 outputs a signal SM of 'l'', and the latch 15 latches the count output of the counter 14 at this time.Now, let the count value output of this counter 14 be roolJ.This value r00
1J is output as a rhythm pattern selection signal.
"2 Data "001" is output from rSl and the address input terminal A8 + A7 of the rhythm pattern storage circuit 3
* Applied to A6. Therefore, the fill-in rhythm pattern storage circuit is read out from the rhythm pattern storage circuit 3 instead of the normal rhythm pattern data up to that point.

Note that in the above embodiment, the degree of chord change is detected based on the chord specified this time, the chord specified last time, and the chord specified the day before last; however, the degree of change in the chord is not limited to this; It is also possible to base it on two chords, this time and the last time.

Furthermore, although the degree and type of change in the root note of a chord are detected, it is also possible to detect the degree of change in the root note and type of the chord.

〔Effect of the invention〕

As explained above, this invention sequentially detects and stores the degree of change in the chord discrimination signal in response to key operations on the accompaniment keyboard, and also detects and stores the degree of change in the chord discrimination signal of the chord of a predetermined period before and the chord of the currently specified chord. Since we have provided an automatic rhythm playing device for an electronic musical instrument that detects the degree of change from the discrimination signal and further provides a predetermined chord change pattern storage circuit to switch the rhythm pattern according to the change in chord, it is easy to use. There is an advantage that the rhythm pattern changes very naturally with the device, and a rhythm performance with many variations can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of the automatic rhythm performance device of this embodiment,
FIG. 2 is a detailed circuit diagram of the chord progression determination circuit 6, and FIG.
11, (21 is a diagram showing the code and route contents, respectively,
FIG. 4 is a diagram showing a specific example of chord progression, and FIG. 5 is a circuit diagram showing the values of signals input to input terminals Al to A7 of the code comparator 13. 1... Tempo oscillator, 2... Tempo counter, 3... Rhythm pattern storage circuit, 4...
・Group/accompaniment keyboard, 5...Chord discrimination signal generator, 6...Group/chord progression determination circuit, 7...Rhythm sound source circuit, 8...Chord storage circuit ,9a,
9b... Root comparison calculation circuit, lO...
Comparator, 11... Code storage circuit, 12...
...Chord change memory circuit, 1.3...Code comparator, 14...Counter, 15...Latch, 16...Code progression pattern memory circuit. Patent applicant Casio Computer Co., Ltd. #1 difference 3 figures (+) (2) Kaya 4 figures 5 wins

Claims (1)

[Claims] An accompaniment keyboard, a chord discrimination signal generation circuit that generates a chord discrimination signal indicating the root note and type of the chord specified by the accompaniment keyboard, and a chord discrimination signal generated by this chord discrimination signal generation circuit are detected, and the chord discrimination signal generated by this chord discrimination signal generation circuit is detected. a first hood change memory circuit that sequentially stores the degree of change between the chord discrimination signal of the currently specified chord and the chord discrimination signal of the previously specified chord; a second chord change storage circuit that stores the degree of change between the specified chord and the chord discrimination signal; a chord change pattern storage circuit that stores in advance a plurality of chord change patterns; and means for creating a rhythm sound in accordance with a rhythm pattern switched by a Muhaturn switching circuit based on the stored contents of the second chord change storage circuit and the chord change pattern storage circuit. Automatic rhythm playing device for musical instruments.