JPS60194496A - Automatic rhythm performance apparatus - Google Patents

Abstract

(57) [Abstract] 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 ftf for an electronic musical instrument equipped with a keyboard capable of detecting key pressing speed or key pressing pressure.

[Prior art]

In recent years, automatic rhythm performance devices have been proposed that perform rhythm performance based on fill-in rhythm patterns at predetermined intervals instead of rhythm performance based on normal rhythm patterns in order to vary automatic rhythm performance.

[Problems with conventional technology]

In the conventional example above, 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, causing the song to change. There is a problem that the content may not match the content.

[Purpose of the invention]

It is an object of the present invention to provide an automatic rhythm playing device for an electronic musical instrument whose rhythm pattern changes extremely naturally according to the performance state of a piece of music.

[Key points of the invention]

The rhythm pattern is changed according to the key pressing speed or key pressing pressure on the keyboard.

[First Embodiment] The first embodiment will be described below with reference to FIGS. 1 to 3. In FIG. 1, a keyboard 1 has 61 keys ranging in pitch from 0° to C1, and the output of the 6 keys is sent to a musical tone generation circuit (not shown) to generate a musical tone signal, as well as a speed detector. 2, the key depression speed is detected, and the detection signal is given to an abnormal value detector 3.

The abnormal value detector 3 determines whether the input key pressing speed value is greater than a predetermined set value and outputs the detection signal PC to the output terminal P.
C and added to the address input terminal A of the rhythm pattern memory 6. Further, the carry signal of the tempo counter 5 is applied to the input terminal 〒P as a measure Ptsk VOK, and a counting operation is performed for a predetermined period (in this embodiment, two measures), and the detection signal PO is canceled.

The tempo counter 5 counts tempo clocks, and its count output is output from output terminals 04 to Oo and supplied to address input terminals A4 to AO of the rhythm pattern memory 6.

A plurality of rhythm pattern data are preset in this rhythm pattern memory 6, and its address input terminals A, A7, i receive the output of a rhythm pattern selector 4 for dialing rhythms such as rock and waltz. Supplied. As a result, the rhythm pattern memory 6 outputs rhythm pattern data corresponding to the signal inputs from the address input terminals A and ~A0 to the output terminals 01 to 01 for each output of the tempo clock.
The signal is read from Oo and supplied to the rhythm sound source circuit 7. This rhythm sound source circuit 7 has eight types of rhythm sound sources such as a bass drum and cymbals, and is driven by the corresponding bit data of the rhythm pattern data to output a rhythm sound source signal, which is then transmitted to an amplifier and a speaker (not shown). The sound is emitted as an automatic rhythm sound via the .

FIG. 2 shows a specific circuit of the abnormal value detector 3. In the figure, 8 is a comparator, and its input terminals A, -A.

The key pressing speed value is input as 4-bit data to input terminals B3 to Bo, and 4-bit data ri i OOJ is fixedly set as a predetermined key pressing speed value, that is, a set value. And surface input terminal A.

Compare the data of ~Ao, B, ~Bo, and as a result, the signal A
BS (signal "'1" when A≧B) is supplied to the set input terminal S of the SR type flip-flop 9 and the input terminal LD of the load counter 10, respectively.

The set output of the flip-flop 9 becomes the detection signal PO, which is sent to the rhythm pattern memory 6 and also given to the AND gate 11 as a gate control signal. The above-mentioned pk VOK is input to this AND gate 11, and its output is added to the clock input terminal OK of the load counter 10 for counting. The input terminal ~Lo of the load counter 10 is given data r0010J representing two bars as a predetermined bar value, and is taken in when the result signal ABS is output as '1'. Next, the bar clock VOK A down-count operation is performed every time the count value reaches rOJ, and when the count value reaches rOJ, one signal is outputted from the output terminal Br and supplied to the reset input terminal R of the flip 70 knob 9.

Next, the operation of the first embodiment will be explained with reference to the time chart shown in FIG. Before starting the automatic rhythm performance, first, the rhythm pattern selector 4 specifies, for example, a rock rhythm, and the specified data is applied to the address input terminals A, -A6 of the rhythm pattern memory 6.

Next, the rhythm start button is turned on, and key operations on the keyboard 1 are started in synchronization with the rhythm start.

Then, the tempo clock starts to be output by the rhythm start operation and is applied to the tempo counter 5 and counted. The count output is then applied to the address input terminals A4 to Ao of the rhythm pattern memory 6. In addition, the detection signal PC, which is normally "0", is input to the address input terminal A, so that the normal rhythm pattern data of the specified rhythm is repeatedly read out from the rhythm pattern memory 6 in units of one measure, and the output terminals 07 to Oo are through which each rhythm sound source of the rhythm sound source circuit 7 is driven. Therefore, the rhythm sound is emitted from the speaker.

On the other hand, the key pressing speed of the key output from the keyboard 1 is detected by a speed detector 2. Then, the key pressing speed value is detected by the abnormal value detector 3.
The signal is applied to the input terminal As -An of the comparator 8 in the B input terminals B3 to B0, and its magnitude is compared with the set value "1100" of the B input terminals B3 to B0. As shown in FIG. 3, when the key pressing speed values from the first key to the fifth key are smaller than the set value "1100", the comparison result signal ABS output at each key pressing is ABS.
(It is output as '0' by B. Therefore, at that time, the Arrival flop 9 is not set and maintains the reset state, and the load counter 10 also does not start the !1' number operation.

Next, if the 68th needle pusher speed value is greater than the set value 1'-1100J, for example 1.101J, then A)B is determined, the signal ABS is output as "1", and the flip-flop 9 is set. Then, the load counter 10 is loaded with a predetermined measure value [0010J.Therefore, the set output (detection signal PC) of the flip 70 knob 9 becomes ``1'' and is applied to the address input terminal As of the rhythm pattern memory 6. Also, the AND gate 11 is opened. Therefore, from now on, until the signal PC becomes 0'', fill-in rhythm pattern data is read out from the rhythm pattern memory 6 in place of the normal rhythm pattern data up to that point, and the fill-in rhythm pattern data is automatically played. .

Next, if the key pressing speed value of No. 7.8.9 @ is smaller than the set value, the signal ABS is 0'', so the set state of the flip-flop 9 does not change, and the load counter 10 is The bar predetermined value (“2” in decimal notation) remains set.

When the key pressing speed value of the 10th key is greater than the set value, a signal ABS of 1" is output, but the flip-flop 9
, the state M of the load counter 10 does not change. Also the first
The same applies if the number 1 key is also larger than the set value. Then, the 12th cup is operated at the break of the measure, and since the key pressing speed value is smaller than the set value, the signal ABS is output as 0''. Also, the 4-measure VOK from the tempo counter 5 is output. Therefore it is load counter 10
7 is applied to the input terminal OK and is counted down, and the counting output becomes "1".

Until the bar clock VCK is output again, all the key pressing speed values of the 12th to 17th keys are set to [1100J].
Therefore, the flip 70 knob 9 continues to be in the set state, and the count output of the load counter 10 is "1".
” to hold. Then, the measure clock VOK is output, and since the key pressing speed value (18th key) at that time is smaller than the set value, the load counter 0 further counts down and its count output becomes "0". Therefore, the signal 13r is 1
The signal PC becomes 1'' and the 7 lip-flop 9 is reset, and the signal PC becomes 0'' and is applied to the address input terminal A of the rhythm pattern memory 6 and the AND gate 11. Therefore, instead of reading out the fill-in rhythm pattern data that continued for two bars at +tt and t, normal rhythm pattern data is read out, and the normal rhythm is automatically played. Also, the AND gate 11 is closed and the down-counting operation of the load counter 0 is prohibited.Next, before the next bar clock VOK is output, the 20th
Press the next key. At this time, since the key pressing speed value exceeds the preset value, the signal AB8 is output as 1''. Therefore,
7 lip-flop 9 is set and its signal PC becomes 1''
and the p-do counter 0 is set to the predetermined value of the measure "2".
Re-incorporate. In this way, do the same as above,
The fill-in rhythm is switched again in the middle of the bar, and the fill-in rhythm continues until the bar clock VOK is output twice.

[Second Embodiment] Next, a second embodiment will be described with reference to FIGS. 4 and 5. In this second embodiment, two types of set values are provided to be compared with the key press speed value: one that varies by 110 degrees according to the current key press speed value, and one that is at an absolute level. Then, the length of the fill-in sound emitted is switched in accordance with the two set values. FIG. 4 shows a specific circuit of the abnormal value detector 3. Note that the same functional parts as in the first embodiment are given the same numbers to avoid duplication of explanation.

In FIG. 4, the input terminal X of the arithmetic unit 12. A key pressing speed value is input to ~X3, and data from the latch 14 is fed back and input to input terminals Yo~Y. Therefore, the arithmetic unit 12 calculates Xo ""Xs, Y.

When the input signals of ~Y, respectively, are X1Y, an operation is performed to output the next operation result 2 from the output terminal 2°-2.

Z=0.1X+0.9Y In other words, calculation result 2 is the average of the current key pressing speed value X and the previous value Y, and output terminal 2°~2
．． The average value is output as a new average value and given to the latch 14. The latch 14 latches the calculation result 2 using a signal WR="l" output by 0PU (central processing unit, not shown) when a key is pressed, and sends it to the input terminal Y. -Y, and also to the multiplier 13. The multiplier 13 converts the operation result into 6
The multiplied data α2 is outputted and applied to the input terminals J3° to B of the comparator 8, and compared with the current pressing speed value.

On the other hand, 15 is a decoder, into which a key pressing speed value is input. When the value is larger than the data β, the data “
When the value is between β and α2, data “1” is outputted and applied to the input terminals L0 to L3 of the load counter 10. The data "2" and "1" respectively designate a maximum rhythm pattern change period of two bars or one bar.

Next, the operation will be explained with reference to the time chart shown in FIG. Every time there is a pressing needle, the key pressing speed value is sent to the input terminals Ao to As of the comparator 8 and the input terminal Xo of the calculator 12.
s N decoder 15, respectively.

The latch 1 is connected to the input terminals YO to Y of the arithmetic unit 12.
Since the previous calculation result 2 from 4 is inputted as feedback, the calculation to calculate the value according to the above formula is executed. As a result, the fifth
As shown in the figure, when the key pressing speed value is smaller than the key pressing speed value of the previous operated key, such as the second key, third key, and fourth key, the calculation result 2 becomes smaller than the previous key. , and is multiplied by 6 and applied to the input terminals T3o-B3 of the comparator 8.

Then, like the 1st to 4th keys, the current key pressing speed value is 2.
When it is smaller than the value multiplied by 6, the signal ABS becomes 0'', the flip-flop 9 remains reset, and the load counter 10 outputs the decoded output of the decoder 15, that is, 1 for the first to fourth keys. Don't take in.

Further, as in the fifth peg, when the current key pressing speed value is smaller than the previous key pressing speed value, the calculation result 2 naturally becomes smaller. As with the sixth key, when the key pressing speed value exceeds the value αz'fi: which is six times the calculation result 2 at that time, the signal ABS from the comparator 8 is output as 1'',
Flip-flop 9 is set, and in this case the sixth
Since the key pressing speed value of the ridge is smaller than β, the decoder 15 outputs data "1" and causes the load counter 10 to load it. As a result, from this point on, the rhythm switches to fill-in rhythm.

Next, when the key depression speed value of the seventh key is at a large level exceeding β, the signal ABS is output as 61''.Then, the decoder 15 outputs data ``2'' at this time.
This data “2” is taken into the load counter 10,
The fill-in rhythm MW period is extended. Further, when the key pressing speed values of the eighth and ninth keys exceed β and the previous value, the signal AB8 is outputted as 61'', and the load counter 10 respectively receives data ``2''.

From then on, when the bar clock VOK is output, the load counter 10 counts down and its value changes from "2" to "
The fill-in rhythm changes to "1" and "0", and when it reaches "0", the fill-in rhythm switches to the normal rhythm. In this way, the sound emission period of the fill-in rhythm is switched between two bars and one bar depending on the performance state at that time. Therefore, switching between normal rhythm and fill-in rhythm is always performed in an optimal state following the performance state at that time.

Although the above embodiment detects the key pressing speed, it is also possible to detect the key pressing pressure.

〔Effect of the invention〕

As explained above, this invention is an automatic rhythm playing device for an electronic musical instrument that changes the rhythm pattern according to the key pressing speed or key pressing pressure. This has the advantage that the rhythm pattern changes and good rhythm performance can be obtained.

[Brief explanation of drawings]

1 to 3 show a first embodiment of the present invention, FIG. 1 is an overall circuit diagram of the same example, FIG. 2 is a specific circuit diagram of the abnormal value detector 3, and FIG. 3 is a time chart. Figures 4 and 5 show the second embodiment, and Figure 4 is a specific circuit diagram of the abnormal value detector 3 of the same example.
FIG. 5 is a time chart. 1...Keyboard, 2...Pressure speed detector,
3... Abnormal value detector, 4... Rhythm pattern selector, 5... Tempo counter, 6...
A: Rhythm pattern memory, 7: Rhythm sound source circuit, 8: Comparator, 9: Flip-flop, 1o: Load counter, 11...
...AND gate, 12... Arithmetic unit, 13.
・・・・・・Sensator, 15・・・Decoder. Patent applicant Casio Computer Co., Ltd. JP-A-Sho GO-194496 (6)

Claims (4)

[Claims] (1) A needle capable of detecting the key pressing speed or key pressing pressure, a level detecting means for detecting whether the level of the key pressing speed or the key pressing pressure exceeds a set level, and a needle capable of detecting the key pressing speed or the key pressing pressure; An automatic rhythm playing device for an electronic musical instrument, comprising: a pattern changing means for changing a rhythm pattern according to a detection signal; and a sound emitting means for emitting a rhythm sound according to the changed rhythm pattern. (2) A patent characterized in that the pattern changing means changes the rhythm pattern when it is detected that the detection level exceeds the set level, and cancels the pattern change after a predetermined period of time has elapsed. An automatic rhythm playing device for an electronic musical instrument according to claim 1. (3) The level detecting means includes means for performing a predetermined calculation on the current detection level and the set level, and using the result of the calculation as a new set level. The automatic rhythm performance device for an electronic musical instrument according to item 1. (4) The automatic rhythm playing device for an electronic musical instrument according to claim 3, wherein the level detecting means includes means for detecting whether the detected level exceeds a certain level. .