JPH0792664B2 - Vibrato controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vibrato control device in an electronic musical instrument.

[Prior Art] Conventionally, there is an electronic musical instrument in which a vibrato depth can be arbitrarily set by using an operator called a modulation wheel that rotates.

Further, there is a type in which the depth of the vibrato at the maximum operation of such an operator (hereinafter referred to as the maximum vibrato depth) can be changed by another switch or the like.

[Problems of Prior Art] In such a conventional electronic musical instrument, when the vibrato depth is calculated from the state of the manipulator by digital calculation, the maximum vibrato depth is changed every time the state of the manipulator changes. The current vibrato depth had to be calculated, which placed a heavy burden on the control circuit of the electronic musical instrument.

[Object of the Invention] An object of the present invention is to set the vibrato depth by digital operation in an electronic musical instrument in which the depth of the vibrato can be changed by an operator and the maximum vibrato depth can be arbitrarily set. The purpose of the present invention is to simplify the process of the vibrato calculation process and to change the depth of the vibrato quickly without burdening the control circuit.

[Main points of the invention] In order to achieve such an object, the vibrato control device of the present invention outputs operation amount information corresponding to an operation amount from a start point of a predetermined operator to a current operation position. Output means and storage means for storing a plurality of unit vibrato information obtained by respectively dividing depths of a plurality of types of vibrato at the time of maximum operation of the operator by the operation amount at the time of maximum operation of the operator And a maximum vibrato depth designating means for designating the maximum vibrato depth of the operating element, and a maximum vibrato depth of the operating element designated by the maximum vibrato depth designating means. Reading unit for reading the unit vibrato information from the storage unit, unit vibrato information read by the reading unit, and an operation amount output by the operation amount information output unit Multiplying means for outputting a value obtained by multiplying the information as vibrato information, and control means for controlling the depth of vibrato added to the musical sound based on the vibrato information output by the multiplying means. The point is to have.

[Embodiment] An embodiment of the present invention will be described below. FIG. 1 is an overall circuit diagram of an electronic musical instrument. The keyboard 1 has 61 keys with pitches C _{1 to} C ₆ , and the signal from each key is a CPU (central processing unit) 2
The key code corresponding to each key obtained as a result is given to the pitch information creating section 3 and the on / off signal of the key is given to the musical sound creating section 4.

The CPU 2 has a microprocessor for controlling all the operations of this electronic musical instrument, and gives signals from various switches of the switch section 5 to the musical tone creating section 4 and the vibrato waveform creating section 6. The vibrato waveform creating section 6 is a circuit that gives various kinds of vibrato waveform data to the pitch information creating section 3.

Reference numeral 7 in the drawing is a modulation wheel, the output of which is sampled by the A / D converter 8 in a predetermined cycle, converted into digital amount of modification data, and given to the pitch information creating section 3. . As a result, the pitch information creating unit 3 gives the pitch information corresponding to the modification data to the musical sound creating unit 4. The pitch information is data proportional to cents, and the pitch information is converted into frequency information (for example, phase angle information) designating a frequency.
Is converted in. That is, the musical sound creating section 4 creates a musical tone signal based on the pitch information and musical tone generating information such as key on / off signals, other tone colors, rhythms, etc.
Sound is emitted as a musical sound through the A converter 9, the amplifier 10, and the speaker 11.

FIG. 2 shows a concrete circuit of the pitch information creating section 3. In the figure, 12 is a ROM (read only memory), and this ROM 12 is
PITCH data gamma _'16 of 16 bits indicating the (described later) and a plurality of sets stored, when it is designated a pitch maximum change due Yotsute modular Yoo rate Chillon wheel 7 to a predetermined switch of the switch section 5 in semitones, The data γ ′ ₁₆ addressed by the CPU 2 is read and given to the multiplication unit 13.

The 8-bit modulation data from the A / D converter 8 is also input to the multiplication unit 13, and this modulation data is multiplied by the data ▲ γ ^′ ₁₆ ▼, and the result data (16
Bit) is given to the multiplication unit 14. The 9-bit vibrato waveform data from the vibrato-waveform creating unit 6 is also input to the multiplying unit 14, which is multiplied by the result data to give the 14-bit result data to the adder 15. This adder 15 has a CP
An 8-bit key code is input from U2, the result data is added to the key code, and the result data (14 bits) is sent to the musical tone creating section 4 as pitch information.

FIG. 3 shows a specific circuit of the vibrato waveform shaping section 6.
In the figure, reference numeral 16 is a reference waveform creating section, and this reference waveform creating section 16 comprises a latch 17, an addend generator 18, and an adder 19. Thus, the latch 17 receives the output of the adder 19 and latches it, and gives the latch output to one input terminal of the adder 19.
The signal S on the upper side shown in the latch 17 indicates a sign bit (code).

The addend generator 18 gives a constant addend to the other input end of the adder 19. The adder 19 adds the latch output and the addend and gives the result data to the latch 17. Further, this result data is given to the vibrato waveform generation unit 20, predetermined vibrato waveform data is created and sent to the frequency information creation unit 3. In addition, S shown on the upper side of the vibrato waveform generation unit 20.
Indicates a sign bit. The latch 17, the addend generator 18, and the vibrato waveform generator 20 are simultaneously driven by the clock from the CPU 2.

Next, the operation of the above embodiment will be described with reference to FIGS. FIG. 7 shows the data structure of the 14-bit pitch information output from the adder 15 of the pitch information creating unit 3. Thus, the lower 6 bits form a minute PITCH section indicating a pitch of a semitone or less, and the upper 8 bits indicate a scale code. This scale code is specified for each pitch C _{1 to} C ₆ as shown in FIG.
It is a hexadecimal expression.

Further, FIGS. 9 and 10 explain the ΔPITCH. First, in FIG. 9, α represents “00000001” which represents the case of semitone data as the maximum pitch change by the modulation wheel 7. is doing. Further, β indicates the value “11111111” when the modulation wheel 7 is maximally variable. Γ is the value shown in the figure, which is obtained by dividing the data of α by the data of β to obtain the data per one bit of the modulation data. That is, change this value to 16
When expressed in decimal, γ ₁₆ = 0.010101, and when rounded at the position shown in the figure, the data when the maximum pitch change is semitone data ▲
γ ^′ ₁₆ ▼ = 0.0101.

Gamma ₁₆ when up to 2 times the FIG. 10 pitch maximum change more semitones (200 cents) to 12 times (1200 cents), gamma _'16 respectively calculated an illustration, the 13 kinds of ▲ ^gamma' ₁₆ is preset in the ROM 12. And this ▲ γ ^′
The designation of ₁₆ is performed by a predetermined switch of the switch unit 5.

Therefore, if the predetermined switch is set at a desired position, for example, at a position where the maximum pitch change is three times a semitone before the performance starts, the set position output is processed by the CPU2 and the ROM1
The address data is given to 2. Therefore, thereafter, from FIG. 10, γ ′ ₁₆ of “0.0303” is read from the ROM 12 and given to the multiplication unit 13. As a result, when the modulation wheel 7 is moved to the maximum position, the pitch of the generated musical tone changes by a maximum of one and a half tone (300 cents).

As described above, after the setting operation of the predetermined switch, the performance is performed while operating the keys of the keyboard 1 and the necessary switches of the switch section 5. In that case, depending on the operation of the key, CPU2
From this, a key code is given to the pitch information creating section 3, and a key on / off signal is given to the tone creating section 4.

On the other hand, the set position of the modulation wheel 7 is converted into a digital amount of modification data by the A / D converter 8 at a predetermined sampling period during a performance and is given to the pitch information creating section 3.

In the vibrato waveform generator 6, the clock from the CPU 2 is a latch 17, an addend generator 18, and a vibrato waveform generator 20.
The adder 19 adds the constant addend from the addend generator 18 to the latch data of the latch 17 and latches the resulting data to the latch 17, and also gives it to the vibrato waveform generator 20. To execute. Therefore, the value of the data latched by the latch 17 increases in a sawtooth wave shape as shown in FIG. 4, and when the value reaches its maximum, it returns to "0" due to occurrence of carrier. In this way, one cycle for generating the vibrato waveform is defined.

On the other hand, the data defining such one cycle of the latch 17 is also given to the vibrato waveform generating section 20, and accordingly, the vibrato waveform generating section 20 responds to the operation of the selection switch of the vibrato waveform of the switch section 5. The vibrato waveform data of either (1) or (2) in FIG. 6 is generated. For example, in the case of FIG. 6 (2), the output vibrato waveform data is composed of the lower 8 bits of the amplitude value data and the MSB sine data as shown in FIG. 5, so that one cycle shown in FIG. For each period, the sine bit of the vibrato waveform shows "0" indicating plus, the lower bit indicates ".FF ₁₆ ", and the lower bit indicates "1", and the lower 8 bits indicate "-. FF ₁₆ ”. And the above is repeated.

On the other hand, in the case of FIG. 6 (2), the sign bit first has a plus "0" for each cycle shown in FIG. 4, and the value increases up to 1/4 cycle and then goes down. After 1/2 cycle, the sign bit is a negative "1", and after 3/4 cycle, the value is up. And the above is repeated.

As a result, the pitch information generating unit 3, multiplying unit 13 gives the results data to the multiplier 14 multiplies the gamma _'16 to Mogi Yoo rate Chillon data, the result data is multiplied further the vibrato waveform data It is given to the adder 15, and the key code is further added to obtain pitch information, which is given to the musical sound creating section 4.

Therefore, the musical tone creating section 4 creates a musical tone signal with a vibrato effect based on the pitch information, key ON / OFF signals, and other musical tone generating information, and outputs the D / A converter 9, the amplifier 10 and the speaker 11 to the musical tone signal. It is emitted as a musical sound through.

〔The invention's effect〕

As described above, the present invention provides a plurality of unit vibratos obtained by dividing the depths of a plurality of types of vibrato during maximum operation of the operator by the operation amounts during maximum operation of the operator. Information is stored, and one of the plurality of unit vibrato information stored is read out according to the depth of vibrato at the time of maximum operation of the specified operator, the read unit vibrato information and the start point of a predetermined operator. Based on the vibrato information obtained by multiplying the operation amount information corresponding to the operation amount from the current operation position to the current operation position, the depth of the vibrato added to the musical sound is controlled,
When setting the vibrato depth by digital calculation,
When the depth or maximum depth of the vibrato is changed, it is only necessary to read the corresponding unit vibrato information and there is no need to calculate a new unit vibrato, which simplifies the calculation process and burdens the control circuit. It is possible to change the vibrato depth quickly without applying
Even if the vibrato depth or the maximum depth is changed during performance, the vibrato depth of the generated musical sound can be changed more reliably and quickly.

[Brief description of drawings]

FIG. 1 is an overall circuit diagram of an electronic musical instrument according to an embodiment of the present invention, FIG. 2 is a detailed circuit diagram of a pitch information creating unit 3, FIG. 3 is a detailed circuit diagram of a vibrato waveform creating unit 6, and FIG. A waveform diagram showing one cycle formed by the vibrato waveform creating unit 6, FIG. 5 is a data configuration diagram of vibrato waveform data, and FIGS. 6 (1) and 6 (2) are diagrams showing vibrato waveform data, respectively. Fig. 8 is a data structure diagram of pitch information, Fig. 8 is a diagram showing the contents of scale code, Fig. 9 is a diagram showing an example of various data for obtaining a small PITCH, and Fig. 10 is a diagram showing the maximum change of 13 types of pitch. data gamma _16, a diagram showing the ▲ gamma _^'16 ▼ content of. 1 ... Keyboard, 2 ... CPU, 3 ... Pitch information creation unit, 4
...... Music tone creation section, 5 …… Switch section, 6 …… Vibrato waveform creation section, 7 …… Modulation wheel, 8 ……
A / D converter, 9 …… D / A converter, 11 …… Speaker, 12 ……
ROM, 13, 14 ... Multiplier, 15 ... Adder, 16 ... Reference waveform generator, 20 ... Vibrato waveform generator.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-111588 (JP, A) JP-A-56-74298 (JP, A) Actually open 54-54327 (JP, U) Actual-open Sho 55- 63593 (JP, U) Actually opened 55-63595 (JP, U)

Claims (1)

[Claims] 1. An operation amount information output means for outputting operation amount information corresponding to an operation amount from a start point of a predetermined operator to a current operation position, and a plurality of kinds of vibrato depths at the maximum operation of the operator. A storage means for storing a plurality of unit vibrato information obtained by respectively dividing the operation amount by the operation amount at the time of maximum operation of the operator, and a maximum for specifying the depth of vibrato at the time of maximum operation of the operator. Vibrato depth designating means, reading means for reading out the unit vibrato information corresponding to the vibrato depth at the maximum operation of the operator designated by the maximum vibrato depth designating means from the storage means, and the reading means. Multiplying means for outputting the value obtained by multiplying the unit vibrato information read out by the operation amount information output by the operation amount information output means as vibrato information. And a control means for controlling the depth of the vibrato applied to the musical sound based on the vibrato information output by the multiplying means.