JPS5990896A - 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] (υTechnical Field of the Invention The present invention stores frequency information corresponding to six keys, reads out and accumulates this content, and generates a designated duty width value based on the accumulated result. The present invention relates to a device for generating a frequency modulation effect in an electronic musical instrument that outputs scale pulses having different duty widths.

(2) Prior art and problems Conventionally, a memory was provided to store in advance a frequency number, which is frequency information corresponding to a duplicate key, and a key code formed in response to a predetermined pressed key was used as an address, and An electronic musical instrument is used in which a frequency number is read out, the read frequency number is accumulated by an accumulator, and based on the accumulation result, a memory in which musical sound waveforms are stored in advance is sampled to obtain a desired pitch musical waveform signal. . Furthermore, in order to obtain a desired musical tone, the width value at each sampled point is calculated using the Fourier method based on the cumulative results. Electronic musical instruments and the like have been proposed in which a desired pitch waveform signal is obtained by sampling based on the cumulative result.

These electronic musical instruments are equipped with a large amount of memory for storing musical waveforms for each tone or for each tone sequence multiplied by the number of simultaneous pronunciations, as well as arithmetic circuits for creating desired waveforms using calculations such as the 7-chillie method. Depending on the number of samplings, a very large number of circuits are required, such as circuits for interpolating between sample points.

On the other hand, the present applicant has developed an electronic musical instrument that basically uses the above-mentioned memory accumulation method, and has effectively reduced memory and arithmetic circuits so as to be suitable for small and popular electronic musical instruments. According to a separate application, by accumulating the frequency numbers read out according to the pressed keys and comparing the accumulated results with the duty width specified value, the comparison result can be obtained by accumulating the frequency numbers read out according to the pressed keys. We proposed a method to output scale pulses. After that, vibrato,
Studies were conducted on devices that generate frequency modulation effects such as delay vibrato and glide.

(3) Purpose of the Invention The purpose of the present invention is to store frequency information corresponding to six keys, read out and accumulate this content, generate a designated duty width value based on the cumulative result, and generate various duty widths. To provide a musical instrument equipped with a device for generating a simpler and more effective frequency modulation effect for an electronic musical instrument that outputs pulses of different sounds.

(4) Structure of the Invention In order to achieve the above object, the electronic musical instrument of the present invention includes a storage means for storing frequency information corresponding to six keys in advance, and an accumulating means for reading out and accumulating the stored frequency ft information. , a duty width designating means for generating a designated duty width value, and a comparison means for comparing the cumulative value from the accumulating means with the designated duty width value and transmitting a scale pulse having a designated duty width. In the electronic musical instrument, the duty width specifying means includes a pulse width specifying means for specifying a pulse width, and a modulation means for temporally converting the duty width in a period including the pulse 1 using riddle, tablet, and envelope information. It is characterized by having a good structure.

(5) Embodiment of the Invention FIGS. 1(α) to Cc) are explanatory diagrams of the principal parts of the above-mentioned proposed example to which the present invention is applied.

As mentioned above, from the memory that stores the frequency bar, which is frequency information corresponding to six keys, using the key code formed in response to a predetermined press as an address, the frequency number corresponding to the pressed key is determined. The frequency numbers read out are accumulated by an accumulator. In the present invention, instead of obtaining the desired pitch sound waveform by sampling the memory as in the conventional method, the present invention uses this accumulation result by comparing it with the designated duty width value introduced in the proposed example. Then, obtain the corresponding scale pulse. A musical sound waveform is then created by passing the obtained scale pulse through a timbre filter to produce a desired musical tone.

That is, as shown in FIG. 1 (α) ■ to ■, depending on the key information ■ representing the range of the key, a duty width designation value ■ that differs depending on the range is sent from the duty width designator, which will be described later. is input into a comparator and compared with the accumulated value, and the ratio ft9 outputs a scale pulse (2) having a scale frequency with a duty width that differs depending on the range.

Figure (6) Φ, ■) Selected tone tablet information■
, {circle around (2)} send out different duty 1-layer designated values and input them into a comparator, which outputs a scale pulse having a scale frequency with a duty width that differs depending on the tablet.

(C) ■ to ■ in the same figure send out a duty width specified value ■ that changes over time from the duty width designator based on the envelope information ■ that changes over time, and input it into the comparator.
The comparator outputs a scale pulse ■ having a scale frequency that is a duty width that changes over time.

In this way, scale pulses can be output from the accumulated value with a simple configuration without using many memories or arithmetic circuits, and therefore it can be applied to small or popular electronic musical instruments.

FIG. 2 is an explanatory diagram of the configuration of an embodiment of the present invention, and is a block diagram of a basic musical tone generating device 10D.

In the figure, when a key/tablet 1 group 101 is pressed, a key/tablet assigner 102 assigns the open/closed state of the key/tablet and sends key information and tablet flavor to the necessary blocks. do. The frequency number memory 104 stores a frequency number, which is frequency information corresponding to a key on the keyboard, and upon receiving a key code of a pressed key and assigned to the key/tablet assigner 102, the key is pressed. A frequency number corresponding to the code is selected and output. Selected frequency S/NO (
is input to one side of the adder 105, the added take from the adder 105 is input to the latte circuit 106, and is latteted by the clock pulse from the system clock circuit 106, and the output is fed back to the other side of the adder 105. Add as input. In this way, adder 105
The latte circuit 106 operates as an accumulator that accumulates selected frequency numbers by the clock pulse. One of the outputs of the latte circuit 106 is connected to the adder 10
The other input becomes the input of the comparators 1071 and 107z. Comparators 1071 and 1072 receive α, b<b>α) output from the modulator 120, and compare the outputs f and b of the latte circuit 106, and when f≦b, the comparators 1071 and 1072 respectively compare the outputs f and b of the latte circuit 106. The comparator 1072 operates to output "1" when α≦f. Comparator 107t.

Each output of 1072 is input to the mixer 121, and the mixer 12
1, when comparators 1071 and 1072 are both 1", 1"
It operates to output . The modulator 120 receives a pulse width designation signal C that determines the pulse width by the Norculus width designator 108.
', and then pulse width designation signal C as key information.

It operates to receive and modulate tablet information and information from the envelope generator 109.

Next, in Figure 3 (α) ~ (using force, comparator 1071.10
72 v mixer 121. Modulator 120. The pulse width designator 108 will be explained in detail. The ratte circuit 106 outputs a sawtooth waveform that is repeated in response to key depressions, as shown by f in the figure. C in figure (a)
'' is output from the pulse width designator 108 and mixed 4121
The output of is 1if, which completely determines the pulse width as shown in (d) of the same figure.
It becomes n. The comparator 1071 receives the output of the transformer A4120 and compares the outputs f and b of the latte circuit 106, and f≦b.
When f>b, it outputs ``1'', and when f>b, it outputs 0'', outputting a waveform as shown in (6) in the figure.

The other comparator 1072 outputs the other output α<b of the modulator 12G.
>a>, it compares it with the output α of the latte circuit 106, and when α≦f, it outputs '1', and when α>f, it outputs '0'.
It operates to output a waveform as shown in FIG.

Next, as shown in (b) and (c) of the same figure, the comparator 107t
The outputs of 1072 and 1072 are respectively input to the mixer 121. The mixer 121 receives the outputs of the comparators 1071 and 1072, and outputs "1" only when both are 1", and outputs 0' in other cases. A waveform as shown in d) is output.In the same figure, α', b' are the amplitudes IKα, b=α, which are compared with f.
Indicates the time value corresponding to 10.

Next, a method for obtaining the frequency effect, which is the main part of the present invention, will be described using the embodiment shown in FIG.

Figure 4 (α) and (b) are the waveform diagrams.
α) is a latte circuit 1o6 with period T corresponding to key presses
shows the output f.

Next, pulse 1m c at pulse width designator 1o8
7>f is designated and input to the modulator 120. Modulator 12
0 is the key 'I# from the key/tablet assigner 102
-4.

It operates to temporally change the value of α and the peak of b-α10 in response to the tablet information or 'rrjtd from the envelope generator IQ9. Therefore, the value of α or b, which is the reference for comparison with the output f of the latte circuit 106 in the comparator 1'071-1072, changes.

As a result, the output of the mixer a121 is, as shown in FIG. 12B, that the period T of the sawtooth waveform output f in FIG. It is converted to TQ and its frequency changes. That is, by increasing the value of α with time while keeping the frequency of the output f of the ratte circuit 106 constant, the frequency will not decrease,
Next, by decreasing the value of α over time, a frequency effect can be obtained in which the frequency of the output of the mixture a121 becomes higher.

Therefore, the key/tablet assigner 102 provides information for adjusting the vibrato effect, that is, the depth A of the vibrato and the speed f=2π/ω as shown in FIG.
) As shown in FIG.
It operates to output Asi11ωt+c.

FIG. 6(α) shows a specific circuit example of the modulator f20 for adding the vibrato effect. Modulator 120 is key/
Upon receiving the information 4L of the vibrato speed ω from the tablet assigner 102 4174, the transverse wave generator 1201 outputs A
s1nωt is generated. This output [Asu]ωt is divided into two branches, one is output as α, and the other is output from the calculator 12o.
2 and is added to the output 0 of the pulse width designator 1o8 and output as a backward curved output.

The outputs a and b of this transformer 120 are the comparison a 1 G71
, 1072, respectively. As a result, as shown in FIG. 4(6), the output of the mixer 121 has a cycle that changes with time, and as a result, a frequency that changes with time, producing a vibrato effect.

Next, to explain the delay vibrato effect, in the same way as the method for obtaining the vibrato effect described above, the I'S information for adding the delay vibrato effect, that is, the delay time d, is set by the key/tablet assigner 102.
In response to the information shown in FIG. 5(b) consisting of A and velocity ω, and the output 0 from the pulse width designator 108, the modulator 120 operates α=A(t-d)xsinωt+
bzAct-d) I/ to output xsvωt+c
il: to act/act.

FIG. 6<b> shows a specific circuit example of the modulator f20 for adding the above-mentioned delay vibrato effect. Modulator 12
0 is received by the key/tablet assigner 102, vibrato depth A<t>, vibrato speed ω(t), and delay time d, and is delayed by a short time d in the delay circuit 1203. The output is ACt-
d).

ω(t-d) is input to 120 modulated wave generators,
As in the same figure (a), G=A (t − d ) xain
ω(t)t, b=A(t-d) X5inω(1)
Outputs 100.

These outputs α and b are input to comparators 1071 and 1072, respectively. As a result, a pulse waveform with a delay vibrato effect can be obtained as the output of the mixer 121.

Next, we will discuss the glide effect. Information for obtaining a glide effect using the key/tablet assigner 102;
That is, frequency displacement p1 time t, glide shape q (
t) In response to the information shown in FIG. 5(C)K consisting of is changed as shown in the figure, and this output is expressed as α=q(
t), b=qct)+c, qco)=p as the ratio M
Input to R61071 and 107z respectively. As a result, a glide effect can be obtained as the output of the mixer 121.

Regarding each frequency effect, the output C of the pulse width designator 108 has been treated as a constant value, but it is possible to change the pulse width by changing this value.
(7) By changing the frequency over time, it is possible to change the pulse width at the same time as changing the frequency.

In Fig. 2, one set of comparisons 4107t+1072,
Although the frequency effect device consisting of the modulator 120 and the mixer 121 has been described above, by using the frequency effect device in a hidden group, it is possible to independently generate and combine different frequency effects r for each group.

Returning to FIG. 2, the output of the mixer 121 is input to the envelope adder 110, and the envelope is changed into a shinai by the envelope signal from the envelope generator 109, which takes in the key 1 information and tablet information and generates the desired envelope. Being talked about. Thereafter, the output of the envelope adder 110 is passed through a timbre filter 111 to form a desired musical sound waveform based on the tablet information, and the musical sound waveform is sent to the sound system 112.

(6) As described in detail, according to the present invention, frequency information corresponding to six keys is stored, this content is read out and accumulated, and the accumulated value and the duty width from the duty width specifying means are calculated. In an electronic musical instrument that outputs scale pulses having various duty widths by comparing a specified value with a specified value, the duty width specifying means includes a pulse width specifying means for specifying a pulse width, and a duty width during a period including the pulse width. An electronic musical instrument is realized, which includes a stable, a tablet, and a modulation means for changing the ie from time to time based on envelope information.

As a result, it is possible to obtain scale pulses corresponding to a musical tone waveform with a simple configuration, and furthermore, with a configuration adapted to this, it is possible to add various frequency effects to the musical tone waveform.

[Brief explanation of drawings]

FIGS. 1(α) to (C) are diagrams explaining the principle of the main parts of the proposed example applicable to the present invention, FIG. 2 is a diagram explanatory of the configuration of the embodiment of the present invention,
Figures 6, 4, and 5 (α) to (c) are operational waveform diagrams of the main parts of the embodiment, and Figures 6 (α) and (b) are concrete circuits of the main parts of the embodiment. As an example, 101 in the figure is a key/target switch group, 1o2 is a kill/target assigner,
106 is the system clock number, 104 is the frequency number memo'), 105 is the counter, 1o6 is the ratte circuit, 1
071.1072 is a comparator, 108 is a pulse 1 designator, 109 is an envelope generator, 11o is an envelope striking force 0 device, 111 is a tone filter, 112 is a sound system, 120 is a modulator, and 121 is a mixer. . Patent Applicant Kawai Kuriki Co., Ltd. - A Tsubosho Agent Patent Attorney 1) Yoshiro Saka Figure 3 Figure 4 728- Figure 5 (a) 1-=- 2ba (b) w (12) (C )

Claims (3)

[Claims] (1) A storage means for pre-storing frequency information corresponding to a master key, an accumulation means for reading out and accumulating the stored frequency information, a duty width designation means for generating a duty width designation value, and a storage means for storing frequency information corresponding to a duplicate key; in the electronic musical instrument, the electronic musical instrument comprises comparison means for comparing the cumulative value of the duty width with the designated duty width value and transmitting a scale pulse with a designated duty width, wherein the duty width designation means comprises a pulse width designation means for designating a pulse width; , a modulation means for temporally changing the duty width in a cycle including the pulse width using key, tablet, and envelope information. (2) The electronic musical instrument according to claim 1, further comprising means for temporally changing the pulse width of the pulse width specifying means based on key, tablet, and envelope information. (3) A plurality of means are provided for comparing the accumulated value from the accumulating means and the duty width specified one shift, and the accumulated value from the accumulating means is compared with a plurality of duty width specified values to obtain different cycles. 2. The electronic musical instrument according to claim 1, further comprising means for selecting a scale pulse having a pitch pulse and means for combining the selected scale pulse.