JPS5812594B2 - Denshigatsuki no Neiroseigiyosouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a timbre control device for an electronic musical instrument, and more particularly to a device capable of subtle timbre control.

Traditionally, the tones of electronic musical instruments are created using a low-frequency P-wave, Takagi-roha, band-pass, and band-removal filters, but in order to control the expression of the voice once created, preliance adjustment Since only a filter was installed to increase or decrease Takagi, delicate selection of tones was virtually impossible.

The present invention focuses on this point, and provides a timbre control device that makes it easier to adjust the subtle expression of tone than before, and allows for a wider range of changes in the expression of sound.

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a block diagram of an electronic musical instrument including a timbre control device. A sound source 1 that generates a scale signal is connected to a key switch 2, and a scale signal is selected by pressing a key on a keyboard linked to the key switch 2. , is added to the timbre circuit 3 to become an instrument sound, and is transmitted to the speaker 5 via the waveform group 4 of the timbre control device.
pronounced by

A DC power supply 6 generates a DC voltage proportional to the pitch of the scale signal, and supplies the DC voltage to a key switch 7 that operates in conjunction with the key switch 2.

The DC voltage selected by pressing the key is applied to the arithmetic circuit 8.

The arithmetic circuit 8 outputs the value when one key is pressed and there is one DC voltage, and outputs one of the highest voltage, lowest voltage, average voltage, etc. when there are multiple keys and multiple DC voltages. , is supplied to the wave generator group 4 via the control terminal 10.

The operating device 9 controls the amplitude frequency characteristics of the wave generator group 4.

FIGS. 2 and 3 each show an embodiment of the wave generator group 4. FIG.

In FIG. 2, wave generators 21 and 22 having resonance peaks as shown in FIG. 4 as amplitude frequency characteristics are connected in series.

A musical tone signal from an electronic musical instrument is applied to an input terminal 20, and an output signal is taken out from an output terminal 23.

As mentioned above, the amplitude frequency characteristics of the wave generators 21 and 22 have resonance peaks, and the resonance frequencies fA and fB can be changed according to the resistance values of the variable resistors 24 and 25 operated by the operating device 9, respectively.

Further, the resonance frequencies fA and fB of the resonance peaks can be changed by the DC voltage applied to the terminal 10.

In FIG. 3, two door transducers 26 and 27 having the amplitude frequency characteristics shown in A and B in FIG. , creates an amplitude frequency characteristic with two resonance peaks.

The resonant frequency rotation of the resonant peak and fB can be changed according to the resistance values of the variable resistors 24 and 25 as in the case of FIG. 2, and can also be changed according to the DC voltage applied to the terminal 10.

The transmission characteristic from the input terminal 21 to the output terminal 23 is a part of the flat amplitude frequency characteristic as shown by the broken line in FIG.
It will have a mountainous shape.

6 and 7 are examples of the power supply 6, key switch 7, and arithmetic circuit 8 in FIG. 1.

In FIG. 6, a DC power source 6 is connected to one end of a plurality of resistors R connected in series so as to sequentially connect a plurality of terminals 31 on the movable contact side of the key switch.

The busper 32 on the fixed contact side of the key switch has a load resistance R
It is grounded via L, and the output voltage is taken out from the busper 32 to the output terminal 33.

The terminals 31 on the movable contact piece 34 side of the key switch are arranged in accordance with the pitch order of the musical scale.

In Figure 6, from the top: C, C#, D, D#,
It is configured in the order of E and F.

When one of the six movable contact pieces 34 is pressed in the above order, the voltage appearing at the output terminal 33 is E,RL E/(RL
+R), RL E/(RL+2R), RLE/(
RL+3R), RLE/(RL+4R), RLE/(
RL+5 R), and the output voltage is obtained according to the pressed movable contact piece, that is, according to the selected pitch.

Furthermore, when a plurality of movable contact pieces 34 are pressed simultaneously, an output voltage corresponding to the lowest pitch among them is obtained.

By arranging the movable contacts in the reverse order, it is also possible to select the voltage corresponding to the highest note.

This voltage at output terminal 33 is applied to terminal 10 in FIG.

In FIG. 7, one end of a plurality of resistors R connected in series is connected to the DC power supply 6, the other end is grounded, and each connection point of each resistor R is connected to each terminal 31 on each movable contact piece 34 side of the key switch. They are connected to each other, and the output voltage is taken out from a busper 32, which is a common fixed contact, to an output terminal 33.

When one movable contact piece 31 is pressed, the power supply voltage E is divided according to the pitch corresponding to that movable contact piece, and the output terminal 33 is
to get the output voltage.

For example, in C#, the output voltage is (4R%6R)·E-2E/3.

When a plurality of movable contacts are pressed simultaneously, a voltage intermediate between the output voltage corresponding to the highest note and the output voltage corresponding to the lowest note is obtained.

In FIGS. 6 and 7, the number of movable contact pieces can be increased depending on the range of the keyboard.

A DC voltage corresponding to the range of the musical sound signal obtained at the output terminal 33 in this way is applied to the sound wave device group 4 via the terminal 10, and the resonance peak of the sound wave device group 4 is applied according to the upper and lower ranges of the musical sound signal. Raise or lower the resonant frequency of.

In this way, in a certain range or in a specific key, the fundamental frequency of the sound source signal and the frequency of its harmonic components will match the resonance frequency of the resonance peak, and the volume will become significantly louder. You can always get the right tone and volume.

As the operating device 9 for operating the variable resistors 24 and 25 in FIGS. 2 and 3, two slide volumes may be used side by side, but it is better to use a swingable operating device as shown in FIG. 8. good.

This swing type operating device has rotary variable resistors 41 and 42 attached to two perpendicular sides of a housing 40 so that their respective rotation axes can rotate freely, and a lever 44 with 43 as a fulcrum. The configuration is such that the resistance values of the variable resistors 41 and 42 can be independently and freely set depending on the direction.

By using this swing type, the resonance frequencies of the two resonance peaks can be freely controlled by operating one lever 44.
It is easy to subtly control the tone.

Furthermore, since the lever 44 can be freely moved in a circular, elliptical, or linear shape, by selecting the shape of this locus, it is possible to realize an unprecedented timbre modulation so-called wah-wah effect.

In addition to the conventional sounds similar to "wa" and "u", it is also possible to create sounds similar to "e", "o", and "i", making it possible to combine these sounds in order.

FIG. 9 shows another embodiment of the operating device 9, in which a keyboard 50 is supported on a substrate 51 by a spring 52, so that the keyboard 50 can move in three-dimensional directions: up and down, back and forth, and right and left.

The movement in the three-dimensional direction is detected instead of a voltage fluctuation using a pressure-sensitive element, a strain gauge, etc. provided between the keyboard 50 and the board 51, and any two of these three voltage fluctuations are detected. , for example, the voltage fluctuations in the left-right direction and front-back direction,
This is replaced by the variation in resistance value of the variable resistors 24 and 25 in FIGS. 2 and 3.

For this purpose, for example Cd
Using a CdS photocell lamp element, the above voltage may be applied to the lamp to change the resistance value of the CdS photocell.

10A and 10B show still another embodiment of the operating device 9, in which the keyboard 5
0 is supported by a conductive rubber plate 53, and conductive rubber pieces 54, 54' and an angle 55. 5 and 5', and the rear part is supported by a conductive rubber piece 56 and an angle 5T.

When the keyboard 50 is pressed downward, the resistance of the conductive rubber plate 53 decreases.

When moved from side to side, the conductive rubber pieces 54, 54' expand and contract, changing their resistance value.

When moved back and forth, the resistance value of the conductive rubber piece 56 changes.

Two of these conductive rubbers 53, 54, 56 are connected to a variable resistor 24. Use as 25.

When the keyboard 50 in FIGS. 9 and 10 is moved back and forth, left and right during performance, the two resonance peaks move, producing a wah-wah effect. It is also possible to obtain an unprecedented wah-wah effect by following the trajectory of the finger movement.

Since the operating devices shown in FIGS. 9 and 10 can obtain information on three-dimensional movement and position, the F-wave device 21 in FIGS. 2 and 3
, 22, 27, and 28 may be increased to make the number of resonance peaks three.

A foot pedal may be provided on the lever 44 of the operating device shown in FIG. 8, and the tone may be controlled by two-dimensional operation of the foot pedal.

FIG. 11 shows another embodiment of the operating device for detecting a two-dimensional position.

64 is a substrate made of Bakelite or the like, and has a conductive surface 6 on which a conductive paint is applied or a conductive metal is vapor-deposited.
5, and further has an output terminal 66.

Reference numerals 61 and 63 are insulating sheets in which rectangular slits 67, 68 are provided in a soft insulating material such as rubber or vinyl. 68 are arranged perpendicularly to each other.

Reference numeral 62 designates a resistor sheet, on which resistors 69 and 70 are deposited thin and parallel on the upper surface of a soft insulator at appropriate intervals, and a large number of linear conductors 7 are inserted between the resistors 69 and 70 in a direction perpendicular to the resistors 69 and 70.
1 is vapor-deposited, terminals 72 and 73 are provided at both ends of the resistor 70, and terminals 74 and 75 are provided on the lower surface by making a pattern similar to that on the upper surface but shifted by just a right angle.

And the slit 67 of the insulation sheet 61 and the resistance sheet 62
The linear conductors T1 on the upper surface of
The linear conductor (not shown) on the lower surface of the insulating sheet 63 and the slit 68 of the insulating sheet 63 are arranged so as to be perpendicular to each other.

60 is a soft film whose lower surface is conductive, and an output terminal 76 is provided by connecting to the conductor on the lower surface.

The membrane 60, the insulating sheet 61, the resistive sheet 62, the insulating sheet 63, and the substrate 64 are sequentially stacked on top of each other, and their peripheries are fixed with an insulating adhesive.

When a DC voltage V is applied between the terminals 72 and 73, different divided voltages appear on the linear conductor 71 depending on the respective positions.

The membrane 60 and the resistance sheet 62 are usually separated by an insulating sheet 61, but when the membrane 60 is pressed with a finger, the linear conductor 71 near the pressed position and the conductor on the lower surface of the membrane 60 come into contact, causing separation. The increased voltage is taken out to the output terminal 76.

The voltage at the output terminal γ6 corresponds to the position in the Y-axis direction.

Also, at this time, the lower surface of the resistor sheet 62 and the surface 6 of the substrate 64
5 also comes into contact.

Therefore, if a DC voltage is applied to terminals 74 and 75,
The divided voltage corresponding to the position of contact in the X-axis direction is output from output terminal 6.
6.

FIG. 12 is a diagram showing the electrical connections of the operating device shown in FIG. 11, and only shows the portion located above the upper surface of the resistance sheet 62, that is, position detection in the Y-axis direction.

When the membrane 60 is pressed with a finger, a portion of the DC voltage V divided by the resistors 69 and 70 is selected via the linear conductor 71.

The voltage on the bottom surface of the membrane 60 is applied to the FET 77 via the output terminal 76.
will lead you to the gate.

FET 77 and resistor 79 constitute a source follower, and output voltage to terminal 80 according to the gate voltage.

A capacitor 78 is connected to the gate, and even if the finger is removed and the contact between the membrane 60 and the resistive sheet 62 is broken, the current gate voltage is stored in the capacitor 78 for a long time.

A magnetic plate is placed under the board 64 of the operating device shown in FIG. 11, and a small piece of a strong magnet is placed on the membrane 60 to increase the absorption force between the small piece of magnet and the magnetic plate. The film 60, the resistance sheet 62, and the substrate 64 may be brought into contact with each other, and voltages may be extracted in accordance with the X-axis and Y-axis directions depending on the position of the magnet pieces.

In this case, contact continues even if the hand is removed from the magnet piece.

Figure 13 shows lachrymal transducers 2 1 , 22, 26, with resonance peaks,
This is an example of No. 27, in which the resonant frequency of the resonant peak is controlled by voltage.

Here, the input terminal 81 and the input terminal of the phase inversion type amplifier 83 are connected via a resistor 82, and the input terminal of the amplifier 83 and the output terminal 84 are connected to capacitors C1 and C2 and resistors R1 and R.
2 and 2 through a parallel T circuit 85.

It is known that the parallel T circuit 85 can block passage of signals of specific frequencies by appropriately selecting its constants.

Therefore, the circuit of FIG. 13 having a parallel T circuit as a feedback circuit becomes a resonant circuit.

When CdS photocell elements are used as the two resistors R1 and R2 and their resistance values are made variable depending on the light intensity of the lamps L1 and L2, the resonance frequency changes.

The amount of light from the lamps L1 and L2 can be varied by changing the voltages applied to terminals M and N.

Such an F-wave device is shown in Fig. 2 and Fig. 3 as Toba device 2L22,
26 and 27, the resonant frequency of the resonant peak can be changed by changing the voltage applied to the tear wave device instead of changing the resistance values of the variable resistors 24 and 25 using the operating device 9.

When using a furnace wave generator that can control the resonant frequency of the resonance peak with a voltage as shown in FIG. It is possible to add sine wave signals with different phase differences to the transducer.

In this case, a modulation effect equivalent to the movement of a circular trajectory using the operating device shown in FIGS. 8 to 11 can be achieved.

Furthermore, if uncorrelated random signals are given to the two wave generators, the controller 9 can be moved in two-dimensional space.
You can get the same modulation effect as if you moved it randomly.

Alternatively, these electrical signals may be mixed and applied.

Further, the wave generators 21, 22, 26, 27, etc. may be of a mixed type in series or parallel, that is, a series/parallel type.

In addition to the resonance frequency of the resonance peak, if the Q of the resonance, the level of the resonance peak, etc. are controlled, even more delicate control of the timbre becomes possible.

Further, by making the shapes of the plurality of resonance peaks different from each other instead of making them the same, it is possible to realize more diverse characteristics than if they were the same.

This is because the amplitude frequency characteristics match when one of the two resonance peaks is on the high frequency side and the other on the low frequency side, and conversely, when one is on the low frequency side and the other is on the high frequency side. This is because nothing will happen at all.

Furthermore, a musical tone signal from a musical instrument other than a keyboard instrument, such as an electric guitar, may be applied to the input terminal 20 in FIGS. 2 and 3.

In the above description, an F-wave transducer having a resonant peak is used, but a band-stop wave transducer having a valley with large attenuation may be used in place of a part or all of the F-wave transducer.

Moreover, a low range furnace wave device can also be used as a part of the plurality of furnace wave devices.

As described above, the present invention adds the sound source signal selected by the key switch to the timbre circuit to produce a predetermined musical instrument sound, and the output of this timbre circuit is taken out via a p-wave generator group separate from the timbre circuit. The above-mentioned wave wave device group is constituted by a plurality of P wave devices having resonance peaks or valleys in the amplitude frequency characteristic, and these wave wave devices are connected in parallel, in series, or in series and parallel, according to the sound range of the sound source signal. The amplitude frequency characteristic of the door wave device is changed, and the amplitude frequency characteristic of the door wave device is continuously controlled in accordance with the operation of an operating device.

In this way, once the sound source signal is applied to the timbre circuit to create a predetermined instrument sound, and the output of this timbre circuit is applied to a reactor wave generator installed separately from the timbre circuit to vary its amplitude frequency characteristics, the timbre can be changed. Subtle timbre control can be performed within a range that does not significantly deviate from the timbre formed by the circuit, making it extremely effective as a timbre control device for electronic musical instruments.

Furthermore, according to the present invention, it is possible to move the frequencies of the resonance peaks and resonance valleys of the amplitude-frequency characteristics of the wave generator group to the optimum position according to the sound range of the sound source signal, so it is possible to always obtain the optimum sound. can.

For example, the fundamental frequency of the sound source signal and the frequency of its harmonic components can be controlled so that they do not match the resonance frequency of the resonance peak to avoid the volume becoming extremely loud, or conversely, this can be actively used. By controlling the fundamental frequency of the sound source signal and the frequencies of its harmonic components to always match the resonance frequency of the resonance peak, it is also possible to make the volume extremely loud.

Furthermore, according to the present invention, since the amplitude frequency characteristics of the sound wave generator are continuously controlled by operating the operating device, in combination with the timbre control according to the range of the sound source signal, even more subtle timbre can be achieved. Can be controlled.

Furthermore, according to the present invention, by using a plurality of resonance wave generators, it is possible to provide many resonance peaks and resonance valleys, so it is easy to produce nuances similar to those of a natural musical instrument.

For example, there are three or more formans in the human voice, and it is possible to make each vowel different by arranging them, but by using the present invention, it is possible to create a musical instrument that has sounds close to each of the human vowels. can.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a keyboard-type electronic musical instrument including a timbre control device of the present invention, FIGS. 2 and 3 are block diagrams showing an example of essential parts of the present invention, and FIGS. Figures 6 and 7 are examples of amplitude frequency characteristics for explaining the
The figure is an example of a circuit for obtaining a voltage according to the range of musical tone signals, FIGS. 8 to 11 are examples of the operating device used in the present invention, and FIG. 12 is an example of the electrical connection of the operating device. FIG. 13 is an example circuit diagram of a furnace wave generator controlled by voltage. 1... Sound source, 2... Key switch, 3... Tone circuit, 4
...Suwa device group, 6...DC voltage, 7...key switch,
8... Arithmetic circuit, 9... Operating device, 21, 22, 26, 2
7... Reactor wave generator, 24, 25... Variable resistor.

Claims (1)

[Claims] 1. A sound source signal selected by a key switch is added to a timbre circuit to produce a predetermined musical instrument sound, and the output of this timbre circuit is taken out through a group of oven wave generators separate from the above-mentioned timbre circuit. The device group is composed of a plurality of P-wave devices having resonance peaks or troughs in their amplitude-frequency characteristics, and these F-wave devices are connected in parallel, in series, or in series-parallel, and the amplitude of the P-wave device is determined according to the sound range of the sound source signal. In addition to changing the frequency characteristics,
A timbre control device for an electronic musical instrument, wherein the amplitude frequency characteristic of the P-wave device is continuously controlled according to the operation of an operating device.