JPS5825696A - Lfo waveform input unit - 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] The present invention allows an operator to freely control LFO (LOW Freq).
This invention relates to LFO waveform manual control of an electronic musical instrument that inputs a waveform (uency 0scillator).

For general VC and child instruments, vibrato, tremolo,
Multi-contact switches and rotary volume controls are used to set repetitive modulation signals such as grauls. However, with these input means, it is difficult for the operator to freely set the waveform, and there are also problems in durability.

This invention was made in view of the above points.

To provide an LFO waveform input device for an electronic musical instrument that allows an operator to freely input and store a VCLFo waveform and also displays the input LFO waveform.

An embodiment of the present invention applied to a VT sub-organ will be described below with reference to the drawings.

In Figure 1,! The child organ 1 has a keyboard 2. which has a plurality of keys for specifying each pitch. Operation unit 3. Speakers 4 are provided as shown in the figures. Furthermore, the operation section 3
power switch 5. A changeover switch 6 for switching and specifying vibrato or tremolo, a rhythm tempo switch 7 for specifying the rhythm tempo speed, a master volume 8 for adjusting the overall tone t, etc. are provided as shown in the figure. In addition, 11! On the child organ l.

An LFO waveform instruction display section 9 consisting of a touch switch and a liquid crystal display device is provided.

As shown in FIG. 2, the LFO waveform instruction display section 9 has a rectangular display panel with 10 lines n1 to n.
1G, 32 columns m t Nm5g<Array-J n (1
It consists of 0x32) indication display elements. Then, the performer can input the desired LFO waveform f by touch operation on each of the instruction display elements, with the horizontal axis representing time and the vertical axis representing the peak value, and the input LFO waveform f
The liquid crystal display is displayed on the LFO waveform instruction display section 9.

Each instruction display element of the LFO waveform instruction display section 9 is constructed as shown in FIG. 3(A).

That is, in FIG. 3(A), 10 is a liquid crystal display device. This liquid crystal display device 1o has the instruction display section 9vC.
Glass plates 10a and 10b on which transparent first electrodes 10C1 and second electrodes 10d forming a mask pattern for mask display are wired.

It consists of a liquid crystal 10e sealed between them. Na 3- Incidentally, the polarizing plate is omitted in FIG. 3(A).

A transparent substrate 12 on which the wiring of the touch switch 11 is exposed is disposed on the upper surface of the liquid crystal display device 10. In this touch switch 11, one electrode is a positive electrode and the other electrode is a negative electrode.
By pressing the finger, the connection between the two electrodes is turned on.

In addition, each touch switch 11 uses a transparent electrode, so that it does not interfere with the display when the liquid crystal display is turned on.

The rest of the transparent substrate 12 except for the touch switch 11 is covered with a cover 13 to protect dust and electrode wiring.

FIG. 3(B) shows another example of the instruction display section 9, in which the same parts as in FIG. 3(A) are given the same reference numerals. In FIG. 3(B), the cover 13 has a guide 13a standing up around the touch switch 11,
The touch switch 11 is turned so that the operator can easily see the location of the touch switch 11.

Next, the circuit configuration will be explained with reference to FIG. The vending machine 21 outputs 4 pulses of a predetermined frequency t'L (input to the 4 counter 22 and divides the frequency by 4. The key matrix 23 consists of each key on the 1st board 4 wired in a matrix.

When each key is scanned by the frequency-divided signal outputted from the counter 22, an on/off detection signal indicating the pressed state of the key is outputted and applied to the key code data assigner 24. The key code data assigner 24 operates according to the frequency-divided signal and outputs a pitch signal and a trigger signal that specify the pitch based on the input on/off detection signal. The signal is given to the musical tone generator 25, and the trigger signal? Envelope generator 26. It is applied to the LFO waveform control circuit 27. Note that this trigger signal is an f signal indicating key-on/key-off.

Envelope generator 26 (generates and outputs an envelope waveform signal in response to a trigger signal from the key code data assigner 24. The envelope generator 26 generates an envelope waveform signal selected by, for example, an operation switch. It is designed to output a signal.

The musical sound generation unit 25 generates a musical sound waveform M having a predetermined waveform,
Based on the pitch signal captured by the key code data assigner 24, it is output as a signal having a predetermined pitch frequency. In addition, the musical tone generator z5HLFO waveform control circuit 2
When an LFO waveform signal (vibrato waveform signal) is given from 7, [ha.

A musical waveform signal obtained by adding a vibrato waveform signal to the pitch frequency signal is output.

Further, an output signal from a touch switch matrix 28 consisting of the touch switches 11 of the I and FO waveform instruction display sections 9 is supplied to the LFO waveform control circuit 27 via an input display control section 29 as LFO data. That is, this L
For every 32 touch operations on row n1 of the FO waveform instruction display section 9, 4-bit LFO waveform data of 1'oooOJ is given to the LFO waveform control circuit 27 from the control section. Similarly row n!・n5sn4*ni*nll*n7en8enl
"oool" is displayed for each touch operation on each instruction display section of lonlO.
J.

ro O10J, ro O11J, [o 100
J, [0101J, [oxtoJ, [ollJ.

[The code data of oooJ and rtootJ are output from the input display control section 29.

These 4-bit LFO waveform data are
Later, the ladder f L F O waveform is given to the loop circuit 27.
Recorded 77, 6゜Kono TJ FO waveform "tll n1
11 circuit 27 generates and outputs an LFO waveform signal based on the LFO waveform data from the input display control section 29.

In the vibrato specification letter @Avc of the changeover switch 6,
outputting a vibrato waveform signal to the musical tone generating section 25;
1, in the tremolo specified state of selector switch 6.
A tremolo waveform signal is output to the multiplier 30.

This multiplier 30 receives a musical sound waveform M from the musical tone generator 25. Envelope waveform signals are provided from an envelope generator 26, respectively. Then, the 1 multiplier 30 multiplies the musical tone waveform signal, the envelope waveform signal, and the LFO waveform signal by 7- and outputs a musical tone signal that is controlled by 1 frequency, which is supplied to the D/A converter 31 to convert it into an analog plain musical tone signal. The converted signal is amplified by the amplifier 32, and the sound is emitted from the speaker 33.

However, the input display control section 29 is still operated by the a-switch pulse CP, and the liquid crystal display device 10 is operated by a predetermined driving method. It is dynamically driven, and therefore, the first electrode fi @ drive signal and the second electrode drive 'R1I signal are outputted to the liquid crystal display device 10. Next, with reference to FIG. 5, LI? The details of the 0 waveform control circuit 27 will be explained below. This LFO waveform control circuit 27 includes a control section 2.
7-1, LFO data waveform storage unit 2 consisting of RAM, etc.
7-2. Address counter 27-3. Interpolation circuit 27-4
has.

Then, the input display control section 29 is input to the control section 27-1.
As well as being able to supply LFO waveform data from.

A trigger signal is given from the key code data assigner 24.

Then, the LF (J data waveform storage unit 27-2, - only
- If you wish to use L F o data, the % control unit 27-1
After setting the address by supplying a predetermined address signal to the switched address counter 27-3 from the LFO data input terminal IN, read/write signal R/WfX'
Remember it as “1”. In this way, the address counter J'& is sequentially incremented, and in this embodiment, the LFO data register T is made up of 32 steps (each step consists of 4 bits).
, is set in the FO data waveform storage section 27-2.

Then, from this LFO data waveform distribution section 27-2, the LF
When reading data, that is, key code data assigner 2
When a trigger signal indicating key-on is given from 4,
The control unit 27-1 sends the LFO clock to the address counter 27-3.

While stepping through the 111th address, the corresponding LFO data is read from the output terminal OUT of the LFO data waveform storage section 27-2. Note that this address counter 27-3 is divided into the upper bit fII11 (counts 32 steps) and the lower bit side (consists of a predetermined number of bits), and the upper bit side data h''-L P'
Due to the address setting of the Of-evening waveform storage section 27-2, data on the lower bit side is given to the interpolation row 27-4 as an interpolated value. Therefore, the interpolation circuit 27-4 further divides the interval between the LFO data of each step and performs linear interpolation, for example, to generate and output an actual LFO waveform signal.

Next, the operation of the above embodiment will be explained. When the power switch 5 is first turned on at the start of a performance, power is supplied to the electronic organ 1 and the oscillator 1 21 starts oscillating. Therefore, the clock pulse CP begins to be output, and the counter 22 begins to output the frequency-divided signal, and each circuit in FIG. 4 becomes operable.

Next, after specifying the changeover switch 6 to vibrato tremolo, operate each instruction display element of the FO data waveform instruction display section 9 to display the desired LFO waveform. For example, as shown in FIG. 6(a), the indication display element (mx, nt) in column 1 mt% row n1,
Similarly, (mffi%n1O)...(mx3
n t ) and sequential operation ``f'', touch switch 11
．． 11 is turned on by human body resistance, and the on signal is input to the input display control unit 29. Therefore, the 111j pole drive signal and the 2nd control signal to light up each instruction display element that has been turned on. A supply drive signal is outputted from the two input display control sections 11 and applied to the liquid crystal display device 10. Therefore, each instruction display element of the LFO waveform instruction display section 90 displays 41 times each time the ON operation is performed. Since the above display will continue from then on, the preset L 1
” You can easily see the 0 waveform. On the other hand, the T
, The preset input of the FO waveform instruction display section 9 is sent via the input display control section 9 to the corresponding display and FO waveform data "0".
O00”, l”1001J・・・・・・・・・”000
0'' is supplied to the LFO waveform control circuit 27.

Therefore, the control section 27- in the LFO waveform control circuit 27
1, data of 32 steps is sent to address counter 2.
7-3, LFO data waveform storage section 27-2 from the left
Input settings f. In this way, the LFO data waveform storage section 27-2 is stored.

LFO waveform data of 4 bits x 32 steps can be set.

When a key on the keyboard 2 is operated, an on/off detection signal is output from the key matrix circuit 23 and processed by the key/code data assigner 24, and the pitch signal and trigger signal corresponding to the operated key are output. It is output from the code data assigner 24.

It is given to the musical tone generator 25 and envelope generator 26. Therefore, the musical tone generating section 25 outputs a predetermined musical waveform signal based on the applied pitch signal, and supplies it to the multiplier fI unit 30. When this G* selector switch 6 is set to vibrato, the LFO waveform control circuit 27 outputs T, FO wave carving signals, F, 'll vibrato waveform signals.

Since 1 is applied to the tone generating section 25, the musical waveform signal outputted from the musical tone generating section z5 has a vibrato waveform signal added thereto. However, the envelope waveform signal from the envelope generator 26 is output from the LFO waveform control circuit 27 to the multiplier 30 when the selector switch 6 is set to tremolo. t1.LF (J waveform signal, that is, a tremolo waveform signal is supplied.

ll- Then, the command is sent to the LFO waveform control circuit 27.

The address counter 27-3 starts sending out the LFO clock in response to the trigger signal given from the key code data assigner 24.Therefore, the address counter 27-3 starts sending out the LFO clock every time the LFO/'!-tsuku arrives. is stepped, and L is determined by the higher-order bi and h data.
The address specified in the FO data waveform storage section 27-2 is 1 inch, and the interpolation circuit 27 uses the lower bit data.
-4, interpolation processing is performed.

In this way, the level of the ^tl, 6LFO waveform signal output from the interpolation circuit 27-4 is
It turns out as shown. When vibrato is specified in this LFO waveform signal, it is supplied to the tone generator 25 as a piprato waveform signal, and '! ,Ta. When tremolo is specified, the multiplier 30 inputs the tremolo waveform and (
will be supplied.

The 1 multiplier 30 receives the musical sound waveform signal from the musical tone generator 25, the envelope waveform signal from the envelope generator 26, and when tremolo is specified, the tremolo signal from the LFO waveform control circuit 27. Waveform signal? The resulting musical tone signal is multiplied by 1)/A converter 31. Speaker 3. via amplifier 32.
Let's emit the sound from 3. Therefore, when the vibrato is in the specified range, K is 1%. When tremolo is specified, tremolo is added to the first musical tone.

After a long time, the i, j, T, li'o waveform instruction display section 9 shows the rod 6
*) It is output from the waveform control circuit 27, and the vibral 1 or tremolo of the generated musical tone is controlled accordingly.

In the above embodiment, the LF in the LFO waveform control circuit 27
Although the O data waveform storage section 27-2 is configured to store one type of LFO data, it is not limited to this, and it may be possible to store a plurality of LFO data. All you have to do is select it and use LFO data.

In addition, in the above embodiment, the L]li'0 waveform instruction display section 9 displays the LFO waveform? Although the touch switch 11 for presetting and the liquid crystal display device 10 for displaying preset LFO waveform data are arranged in an overlapping manner,
However, a liquid crystal display device is used as a flat display device in which both the means are polymerized, but only the light-receiving type is used. Instead, it is possible to use a light-emitting display device, and it is also possible to form transparent touch switches directly on one display panel by polymerizing and forming ζT on the display device.

Further, in the above embodiment, an electronic organ with a single tone output was shown, but an electronic organ with a multiple tone output is used.

The circuits shown in FIG. 4 and FIG. 5 may be time-divisionally driven, and since various control methods for this purpose are well known, they will be omitted.

The waveform input method is not limited to the above embodiments.1 For example, the difference value of the LFO waveform (change value of the LFO waveform)
may be stored, and the input form of the fine waveform data can be modified in various ways.

Further, in the above embodiment, a vibrato waveform and a tremolo waveform are input as the LFO waveform, but other waveforms such as a graze waveform may also be input.

As explained in more detail in this invention, this LFO waveform is stored along with the LFO waveform.
Since the LFO waveform signal corresponding to the above-mentioned stored LFO waveform is generated, the performer can freely perform the LFO waveform signal corresponding to the stored LFO waveform.
The O waveform can be preset, and musical tones with f, b vibrato, tremolo, etc. corresponding to the preset LFO waveform can be played.

Also, the set LFO waveform can be displayed, which is very effective and allows the performer to visually check what LFO waveform has been set.

It also enhances the beauty.

In addition, if you use a touch switch as an input means, you can instantly control LFO such as vibrato and tremolo during performance.
It is also possible to change the waveform.

Durability is also improved compared to when using volume.

=15-

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view of the external appearance of an electronic organ, FIG. 2 is a plan view of the L F O waveform indicator support, and FIGS. 3 (A) and (H) are L F O wave V,
A cross-sectional view of the instruction display section, Figure 4 shows the entire Hoko organ.
α ≠ mocking the display letter Q on the receiving part, Fig. 7 (m ~ (el is L
It is a diagram showing a change in the time of the FO hexagonal signal. 9... LFO waveform instruction display section, 10... Liquid crystal display iF, 11... Touch switch, 27-
LFO waveform control circuit, 27-1...control unit, 2
7-2...LFO data waveform storage section, 27-
3...Address counter, 28...Touch switch matrix. 29... Input display control unit, 30... Multiplier. Patent applicant Casio Computer Co., Ltd. 16-

Claims (2)

[Claims] (1) An input means that allows an LFO waveform to be input, a display means that displays the LFO waveform input by the input means, a storage means that stores the LFO waveform, and an LFO stored in the storage means. An LFO waveform input device comprising: signal generation means for generating an LFO waveform signal corresponding to the waveform. (2) The LFO input device according to claim 1, wherein the input means comprises an IJ sock touch switch.