JP3030902B2 - Electronic musical instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a delay loop circuit, and a tone is generated based on a signal circulating through the delay loop circuit.
To an electronic musical instrument that generates

[0002]

2. Description of the Related Art Conventionally, a loop is formed by a delay element indicating a propagation delay of a vibration constituting a musical tone, a filter for simulating a tone quality of the musical tone, a non-linear circuit for simulating a non-linear behavior in musical tone generation, and the like. An electronic musical instrument having a sound source that simulates the sound of a natural musical instrument is known.

FIG. 14 is a block diagram showing a configuration of the above-mentioned sound source. In the figure, the sound source is configured to simulate a string instrument in a natural instrument. In the non-linear circuit NLT, the speed V _{B of the} operator (for example, bow) and the force (bow pressure) F _{B of the} operator supplied in accordance with the performance information
Accordingly, the excitation signal WB having the waveform of the nonlinear function shown in FIG. 15 stored in advance is read out. This excitation signal WB is supplied to a delay D ₁ , a filter F ₁ ,
It is supplied to the delay loop circuit composed of the delay D ₂ and the filter F _2, to cycle through the delay loop circuit. The circulating excitation signal WB is delayed by the delays D ₁ and D ₂ and attenuated while being filtered by the filters F ₁ and F ₂ .

[0004] The cyclically excited signal WB is supplied to a nonlinear circuit NLT. And the nonlinear circuit NLT
, A new excitation signal corresponding to the excitation signal WB is output and supplied to the closed loop circuit again. Then, the signal attenuating while circulating is extracted as a tone signal.

[0005]

The excitation signal WB in a conventional electronic musical instrument is, for example, a waveform for approximating a friction characteristic between a bow and a string, and the horizontal axis is the bowing speed and the string. This is a relative speed to the vibration speed. The vertical axis indicates the frictional force, in other words, it may be considered as an impulse for string vibration.

[0006] As shown in the figure, the non-linear waveform has sharp corners where the frictional force is maximum (positive or negative). With such sharp corners, many harmonic components are included, so that the musical sound to be produced is very close to the musical sound of an actual natural musical instrument. However, when synthesizing a tone signal in a high-frequency range, the cyclic cycle in the closed loop circuit is shortened, so that a problem arises that noise due to quantization becomes noticeable. Therefore, if the corners of the above-mentioned nonlinear waveform are rounded in order to prevent the occurrence of noise, the harmonic components are reduced when synthesizing the tone signal in the low frequency range. A problem arises in that a musical tone that is not like a natural musical instrument is synthesized.

The present invention has been made in view of the above circumstances, and has as its object to provide an electronic musical instrument capable of synthesizing a musical tone that does not lose the characteristics of the musical tone of a natural musical instrument regardless of the range of the musical tone to be generated.

[0008]

In order to solve the above-mentioned problems, the present invention provides a musical tone control means for generating a plurality of parameters characterizing a musical tone in accordance with a performance, and a pitch among the plurality of parameters. depending on the parameter indicating a non-linear function generator means for generating a different non-linear function
The degree of cornering of the non-linear function is determined by the parameter
The higher the pitch indicated by the parameter, the more the rounded nonlinear function is issued.
And those that live, the circulated while delaying the signal based on a nonlinear function, comprises a delay loop means for signal processing the signal by a plurality of parameters, and outputs the signal circulating the delay loop means as the musical tone signal It is characterized by the following.

[0009]

According to the present invention, a plurality of parameters are generated by the tone control means according to the performance. Then, depending on the parameters indicating the tone pitch of the plurality of parameters, the
The higher the pitch indicated by the parameter, the more rounded the corners
The non-linear function which is generated is generated by the non-linear function generating means. The signal based on the non-linear function is supplied to delay loop means in which a plurality of parameters are set, and the signal is output as a tone signal.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. [First Embodiment] FIG. 1 is a block diagram showing a configuration of a first embodiment of the present invention. In FIG. 1, a keyboard 1 is composed of a black key and a white key, and supplies performance information PI ₁ and PI ₂ corresponding to the performance of a player to a microprocessor 2 and a key touch detection circuit 3, respectively. Microprocessor 2, based on the performance information PI _1, and generates a key-on signal KON, the key-off signal KOFF, the key code KC, supplies a key-on signal KON and key-off signal KOFF to excitation parameter forming circuit 4, the key code KC To the linear system parameter forming circuit 5 and the sound source 6
Supply to

The key touch detection circuit 3 generates an initial touch signal IT and an after touch signal AT based on the performance information PI ₂ , and uses the two signals to generate an excitation parameter forming circuit 4 and a linear system parameter forming circuit 5. Supply to Next, the excitation parameter forming circuit 4 generates a bowing force signal BF and a bowing speed corresponding to a bowing force (Bow Force) according to the key-on signal KON, the key-off signal KOFF, the initial touch signal IT, and the after-touch signal AT. A bowing speed signal BS corresponding to (Bow Speed) is generated and supplied to the sound source 6.

Further, the linear system parameter forming circuit 5 has a delay length DL ₁ , a delay length DL ₂ for synthesizing a musical tone corresponding to the performance according to the key code KC, the initial touch signal IT and the after touch signal AT, and a filter control. generating a signal FC ₁ and the filter control signal FC _2, and supplies them to the tone generator 6. The sound source 6 is constituted by a delay loop circuit including a delay circuit and a filter, and includes the above-described bowing force signal BF, bowing speed signal BS, and key code K.
C, the delay length DL1, the delay length DL _2, in accordance with the filter control signal FC ₁ and the filter control signal FC _2, and outputs the synthesized predetermined tone signal WB.

Next, each part described above will be described in detail. First, the configuration of the sound source 6 will be described with reference to FIG.
2, the sound source 6 includes a delay loop circuit LOOP and an excitation circuit 11. Delay loop circuit LOOP includes an adder AD _1, delay 7, filter 8, the multiplier M _1, the adder AD _2, delay 9, and a filter 10 and a multiplier M _2. Here, the delays 7 and 9 are delay circuits for simulating a delay in vibration of a string, and are constituted by, for example, a shift register or the like.
Delay time of these delay 7 and 9 is set by the delay length DL ₁ and DL ₂ described above.

The filters 8 and 10 are circuits for simulating the frequency characteristics of vibration attenuation in strings, and realize a phenomenon of a natural musical instrument in which the higher harmonic components are rapidly attenuated.

Next, the multipliers M ₁ and M ₂ are circuits for simulating the reflection at the fixed end of the string by inverting the excitation signal circulating through the delay loop circuit LOOP, respectively. The adders AD ₁ and AD ₂ are respectively
This is a circuit for supplying an excitation signal to the delay loop circuit LOOP, and corresponds to a bowed position. Also, the delay loop circuit LOO
Tone signal to cycle the P is supplied to the adder AD ₃ is taken out from the predetermined position (2 points). The adder AD _3, after adding the two tone signal and supplies it to the excitation circuit 11 as a tone signal TS _1.

The excitation circuit 11, the adder AD _4, the divider D _1, and a non-linear circuit 12 and the multiplier M _3. The adder AD ₄ is in the musical tone signal TS ₁ by adding the bowed string velocity signal BS, and supplies to the divider D ₁ as tone signal TS _2. The divider D ₁ divides the tone signal TS ₂ by the bowing force signal BF and supplies the resulting signal to the nonlinear circuit 12 as a tone signal TS ₃ . The non-linear circuit 12, is stored a plurality of non-linear waveform to be described later, supplies a non-linear waveform corresponding to the tone signal TS ₃ to the multiplier M _3. The multiplier M ₃ are, multiplies the bowed string force signal BF to a nonlinear waveform, supplied to the adder AD ₁ and AD ₂ of this as a new excitation signal ES.

Next, regarding the above-described nonlinear circuit 12,
This will be described with reference to FIGS. FIG. 3 is a block diagram illustrating an example of the configuration of the nonlinear circuit 12. In FIG. 1, the nonlinear circuit 12 includes an address decoder 12a and a storage circuit 12b. Address decoding coater 12a decodes the key code KC upper address, the musical tone signal TS ₃ as the lower address. The decoded data is supplied to the storage circuit 12b.

The storage circuit 12b stores nonlinear waveforms WB ₁ , WB ₂ , and WB ₁ corresponding to the pitch (key code KC) shown in FIG.
.., WB ₁₀ , WB ₁₁ ,. In other words, when generating a tone signal in the low frequency range, waveforms (WB ₁ , W 2) with sharp corners are included so as to include many harmonic components.
And in correspondence with the B ₂ side), when generating a tone signal of a high range is to be free of harmonic components, are made to correspond to the corners of the rounded waveform (WB _10, WB ₁₁ side) . As a result, quantization noise is reduced. This storage circuit 1
In 2b, the non-linear waveforms WB ₁ , WB ₂ ,... According to the key code KC ( pitch ) are obtained by the decoded data.
... WB _10, WB _11, is read either ...... it is supplied to the multiplier M ₃ described above.

Next, the excitation parameter forming circuit 4 shown in FIG. 1 will be described with reference to FIG. Excitation parameters forming circuit 4, the address control circuit 4a, bowed string force storage device 4b, bowed string speed storage device 4c, the adder AD _5,
AD ₆ and multipliers M ₄ and M ₅ . Address control circuit 4a, inside provided with a counter, during the key-on signal KON of the key-off signal KOFF, the upper address determined by the initial touch signal IT by modifying the above counter, on the initial touch signal IT The address data AD
D ₁ and supplies ADD ₂ to the storage device 4b and bowed string speed storage device 4c for bowed string force. Also, the key-off signal KOF
When F is supplied, so that you do not want to generate a musical tone signal, respectively, the value of the bowed string force storage device 4b and bowed string speed storage device 4c in accordance with delay length DL ₁ and DL ₂ "0 Is accessed.

As shown in FIG. 6, an initial touch signal I is stored in the storage device 4b for bowing force in order from the lower address.
Time change of bow pressure (stringing force) when T is "0", time change of bow pressure when initial touch signal IT is "1", ...
The time change of the bow pressure when the initial touch signal IT is “n” and the time change of the bow pressure according to each initial touch signal IT are stored. That is, the bowing force storage device 4
b is a time change B of the bowing force BF in accordance with the address data ADD ₁ generated based on the initial touch IT.
It reads the F _0, and supplies it to one input terminal of adder AD _5.

FIG. 7 shows a storage device 4c for the bowing speed.
As shown in the figure, in order from the lower address, the time change of the bow speed (stringing speed) when the initial touch signal IT is “0”, the time change of the bow speed when the initial touch signal IT is “1”,. ... A temporal change in bow speed when the initial touch signal IT is “n” and a temporal change in bow speed according to each initial touch signal IT are stored. That is, bowed string speed storage device 4c in accordance with the address data ADD ₂ that is generated based on the initial touch, reads the time change BS ₀ of bowed string velocity BS, adder this AD ₆
To one of the input terminals.

The other input terminals of the adders AD ₅ and AD ₆ are supplied with an after touch signal AT via multipliers M ₄ and M ₅ . Multiplier M ₄ and M ₅ are, aphthous
This is for adjusting the effectiveness of the touch signal AT. The adder AD _5, the between change BF ₀ when bowed string force
The after touch signal AT is added, and this is supplied to the sound source 6 shown in FIG. 1 as a bowing force BF. Further, the adder AD _6, the after-touch signal AT is added to the time change BS ₀ of bowed string speed, supplied to the sound source 6 shown in FIG. 1 so as bowed string speed BS. Thus, the bowing force BF and the bowing speed B
By changing S with time, the tone signal WB is changed.

Next, the linear parameter forming circuit 5 shown in FIG. 1 will be described with reference to the block diagram shown in FIG. In this figure, the address control circuit 5a in accordance with the initial touch IT, generates address data ADD ₃ for obtaining a bowed string point, and supplies it to the bowed string point storage device 5b. The bowed string point storage device 5b, bowed string point data is stored, supplies the bowed string point data in response to the address data ADD ₃ to one input of the multiplier M _6.

Further, the address control circuit 5c, in response to the key code KC, generates address data ADD _4, and supplies it to the various parameter storage unit 5d. As shown in FIG. 9, the various parameter storage devices 5d store the total delay length DL of the delay loop circuit LOOP, the filter control data FC ₁ , and the filter control data FC ₁ , in correspondence with “0”, “1”,. FC ₂ are sequentially stored. The various parameter storage unit 5d, the total delay length DL in response to the address data ADD _4, and outputs a filter control data FC _1, FC _2. All delay length DL supplies one input terminal of an adder AD ₇ (+) and to the other input of the multiplier M _6. Filter control data FC ₁ is supplied to the filter 10 shown in FIG. 2, the filter control data FC ₂ is supplied to one input terminal of adder AD _9.

The multiplier M ₆ multiplies the total delay length DL by the bowed point data and sends the result to the other input terminal (−) of the adder AD ₇ and one input terminal of the adder AD ₈ . Supply. The adder AD ₇ adds the total delay length DL and the multiplication result (DL-multiplication result), and supplies to the delay 9 so as delay length DL ₁ from bow to frame. Further, the other input terminal of the adder AD _8, it after touch signal AT via a multiplier M ₈ are supplied, an adder AD
₈ adds the after touch signal AT to the multiplication result,
As the delay length DL ₂ from the bow and the string supplied to the delay 7.

[0026] The other input terminal of the adder AD ₉ is supplied with after-touch signal AT via a multiplier M _7, the adder AD ₉ is A in the filter control data FC ₂
After adding the lid touch signal AT, this is supplied to the filter 8. Thus, in the linear system parameters forming circuit 5, for changing the length of the delay DL ₂ and the finger-side filter coefficient FC ₂ and the after-touch signal AT from the bow to the string, so like it can be realized vibrato I have.

According to the above-described configuration, when a performance is performed by a player, performance information PI ₁ and PI ₂ corresponding to the performance are output from the keyboard 1. The performance information PI ₁ is supplied to the microprocessor 2, and the performance information PI ₂ is supplied to the key touch detection circuit 3. In microprocessor 2,
Depending on the performance information PI _1, key-on signal KON, the key-off signal KOFF, and the key code KC is generated. The key-on signal KON and the key-off signal KOFF are supplied to the excitation parameter forming circuit 4, and the key code KC
Is supplied to the linear system parameter forming circuit 5 and the sound source 6. In the key touch detection circuit 3, the performance information PI
_{2 and the} initial touch signal IT and after touch
A signal AT is generated. The initial touch signal IT and the after touch signal AT are supplied to the excitation parameter forming circuit 4 and the linear parameter forming circuit 5.

Next, in the excitation parameter forming circuit 4,
In the address control circuit 4a shown in FIG. 5, by modifying the upper address determined by the initial touch signal IT by the counter, address data ADD ₁ and ADD ₂ corresponding to the initial touch signal IT is generated. Address data ADD ₁ is supplied to the bowed string force storage device 4b, address data ADD
₂ is supplied to the bowing speed storage device 4c.

[0029] In bowed string force storage device 4b, in accordance with the address data ADD _1, i.e. initial touch signal I
A time change BF ₀ of the bowing force is read according to T. Also,
In the storage device 4c for the bowing speed, the address data ADD ₂
Depending on, i.e. reads the time change BS ₀ of bowed string speed in accordance with the initial touch signal IT. Next, adder A
In D _5, bowed string forces the time change BF ₀ to after-touch signal A
By adding T, the effect of the after touch signal AT is added. The bowing force signal BF and the bowing speed signal BS thus generated are supplied to the sound source 6 shown in FIG.

Next, in the linear system parameter forming circuit 5,
The initial touch signal I by the address control circuit 5a
T is the address data ADD ₃ corresponding to the generated. Then, the bowed string point storage device 5b, bowed string point data corresponding to the address data ADD ₃ is read. In the address control circuit 5c, the key code KC
Address data ADD ₄ corresponding to the generated and supplied to various parameter storage unit 5d. In various parameter storage unit 5d, in accordance with the address data AD _4, the total delay length DL shown in FIG. 9, the filter control data FC ₁ and FC ₂ are read. All delay length DL in accordance with the bowed string point data, and the delay length DL ₁ from bow to frame is divided into a delay length DL ₂ from the bow and the string. Delay length DL ₁ is supplied to the delay 9 shown in FIG. 2, also, the delay length DL ₂ is after-touch signal A
After the effect of T is given, it is supplied to the delay 7 shown in FIG. Then, the filter control data FC ₁ is supplied to the filter 10 shown in FIG. 2, and the filter control data FC ₂ is supplied to the filter 8 after the effect by the after touch signal AT is given.

In the sound source 6 shown in FIG. 2, delay lengths DL ₁ and DL ₂ and filter control data FC ₁ and FC ₂ are set as various parameters. The excitation circuit 11 is supplied with a bowing force signal BF, a bowing speed signal BS, and a key code KC. Then, in the nonlinear circuit 12 of該励oscillating circuit 11, the key code KC and tone signal TS ₃ is, by the address de coater 12a, respectively, the upper address is decoded to the lower address.

Then, in the storage circuit 12b, in accordance with the decoded data, ie, the key code KC (in accordance with the pitch ), the nonlinear waveform WB ₁ corresponding to the pitch (key code KC) shown in FIG. WB ₂ ,… WB ₁₀ , WB ₁₁ ,…
Is read out. That is, when generating a tone signal in the low frequency range, the waveforms WB ₁ and WB ₂ having sharp corners are read out so as to include many harmonic components, and a tone signal in the high frequency range is generated. when, as not containing a harmonic component, the waveform WB1 was rounded corners _0, W
Waveform B ₁₁ side is read. This waveform, as the excitation signal, is supplied to the multiplier M ₃ shown in FIG. The multiplier M _3, bowed string force signal BF is multiplied to the excitation signal having a predetermined waveform. Then, the signal output by the multiplier M ₃ are supplied to the delay loop circuit LOOP via an adder AD ₁ and AD _2.

[0033] Then, signals for cyclic delay loop circuit LOOP via the adder AD _3, again, the excitation circuit 11
Return to The excitation circuit 11, a signal which has returned as a new excitation signal TS _1, based on the various parameters, is generated to a new excitation signal. And this new excitation signal
Again, it is supplied to the delay loop circuit LOOP. In this way, the excitation signal is circulated through the delay loop circuit LOOP and is fed back to the excitation circuit 11 to generate a new excitation signal.

As described above, in the first embodiment, the excitation signal having the waveform corresponding to the key code KC is read out with reference to the key code KC according to the pitch of the musical tone signal to be generated. In the sound range, noise can be reduced, and even in the low sound range, a sound that does not lose the characteristics of the sound of a natural musical instrument can be synthesized.

[Second Embodiment] Next, a second embodiment will be described with reference to FIGS. First,
FIG. 10 is a block diagram showing the configuration of the second embodiment of the sound source shown in FIG. In this figure, FIG.
The same reference numerals are given to the same components as those described in (1) and description thereof is omitted. The feature of this embodiment resides in the nonlinear circuit 16, and the nonlinear circuit 12 shown in FIG. 2 stores a plurality of nonlinear waveforms. In this embodiment, however, only the basic waveform is stored and the basic waveform is stored. An excitation signal corresponding to each key code KC is generated depending on how the waveform is read.

In the figure, an excitation circuit 15 is provided with an adder AD
₁₀ and a nonlinear circuit 16. Adder A
D ₁₀ represent respectively the particle diameters by adding the bowed string velocity signal BS to the tone signal TS ₁ output by the adder AD _3, supplied to the nonlinear circuit 16 as a tone signal TS _2. The non-linear circuit 16 is further supplied with a bowing force signal BF and a key code KC.

Next, regarding the above-described nonlinear circuit 16,
This will be described with reference to the block diagram shown in FIG. The tone signal TS ₁ as an input signal IN, the absolute value circuit 16a
It is supplied to the limiter 1 via the multiplier M ₁₂
6e . The absolute value circuit 16a outputs the tone signal TS
Takes the absolute value of ₁ and adds it as absolute signal ABS
And supplies one input of vessel AD ₁₁ to (+). Other input terminal of the adder AD ₁₁ (-), the bowed string force signal BF through the multiplier Ma is supplied. Also, the multiplier M ₉ a bowed string force signal BF over is also supplied to a limiter 16e.

[0038] The limiter 16e is a multiplier in accordance with the bowed string output signal BF supplied via the M _9, to limit the amplitude of the multiplier M ₁₂ [delta] multiplied musical tone signal, the multiplier M ₁₃ This Is supplied to the other input terminal. The adder AD ₁₁ supplies the absolute value signal ABS subtracts the bowed string force signal BF, to select terminal S of the one input terminal and the selector 16f of the adder AD ₁₂ this result. To the other input terminal of the adder AD _12, the output signal of the selector 16f are supplied via the multiplier M _11, the adder AD ₁₂ includes an adder AD
It adds the calculation result and the output signal at _11, and supplies the result to the multiplier M _10.

The key code KC is supplied to the conversion circuit 16b. Conversion circuit 16b converts the key code KC, supplied to the multiplier M ₁₀ so as coefficient gamma. The multiplier M ₁₀ is multiplied by the coefficient γ in the output signal of the adder AD _12,
This is supplied to the table 16c as address data ADD5. The table 16c, FIG. 12 (a) to have a waveform WB _A are stored indicated, the waveform WB _A read according to the address data ADD _5. Read waveform WB _A
Is supplied to the input terminal (A) of the selector 16f. In addition, the table 16d has the waveform WB shown in FIG.
_B is stored, and the waveform WB _B is read according to the address data ADD ₆ . Read waveform WB _B is supplied to an input terminal of the selector 16f (B).

The selector 16f in accordance with the most significant bit MSB of the output of the adder AD _11, supplies the waveform signal supplied to one input terminal A and B in one to one input terminal of the multiplier M ₁₃ to together, and supplies this via a multiplier M ₁₁ to the other input of the adder AD ₁₂ described above. Incidentally, the coefficient ε in the multiplier M _11, is a constant to achieve a hysteresis characteristic.

According to the configuration described above, an excitation signal having a predetermined waveform is generated by the nonlinear circuit 16 shown in FIG. First, when performed by a player, the first
Similarly to the embodiment, the microprocessor 2 generates the key-on signal KON, the key-off signal KOFF, and the key code KC, and the key touch detection circuit 3 generates the initial touch signal IT and the after touch signal AT. Then, in the excitation parameter forming circuit 4,
A bowing force signal BF and a bowing speed signal BS are generated.
In the linear system parameter forming circuit 5, the delay D
L ₁ and DL ₂ and filter control data FC ₁ and FC ₂ are generated.

[0042] Then, in the nonlinear circuit 16 of the sound source 6, the absolute value circuit 16a, the absolute value AB of the tone signal TS ₂
S is taken. The absolute value ABS is supplied to the adder AD _11, after the value corresponding to the bowed string force signal BF is subtracted, the selector coefficient ε in the adder AD ₁₂ is multiplied 16f
Are added. Then, the multiplier M _10, is modified by a factor corresponding to the key code KC gamma. In the table 16c, in accordance with the address data ADD ₅ based on the absolute value ABS, the waveform WB _A illustrated in FIG. 12 (a) is read out.

Here, the address data ADD ₅ is
Since the value corresponding to the bowing force signal BF has been subtracted, the waveform WB _A is shifted in the direction of the arrow A shown in the figure according to the bowing force signal BF. Moreover, since the generated address data ADD ₅ based on the absolute value of the tone signal TS _2,
The waveform has a trapezoidal shape that is symmetrical with respect to the vertical axis in the figure. Furthermore, since the coefficient γ is modifying the address data ADD _5,
In the direction along the illustrated horizontal axis, the waveform is reduced in accordance with the coefficient γ.

In the table 16d, the absolute value A
According to the address data ADD6 based on the BS, FIG.
(B) is a waveform WB _B shown in read. Again,
Similar to the address data ADD ₅ described above, since the value corresponding to the bowed string force signal BF is subtracted, the waveform WB _B is
It is shifted in the direction of arrow B shown in the figure according to the bowing force signal BF. Moreover, since the generated address data ADD ₆ based on the absolute value of the tone signal TS _2, a symmetrical waveform with the vertical axis shown.

The waveforms WB _A and WB _B are
The selector 16f selectively outputs the absolute value ABS depending on whether the absolute value ABS is positive or negative. Therefore, in the low frequency range, a non-linear waveform WBL shown in FIG.
In the high frequency range, the nonlinear waveform WBH shown in FIG.
Is generated.

[0046] Consequently, in the second embodiment, since the order of slowdown in the discontinuous portion of the non-linear function is controlled according to the pitch <br/>, in the high tone range can reduce noise, In addition, even in the low frequency range, a musical tone that does not lose the characteristics of the musical tone of the natural musical instrument can be synthesized.

The storage circuit 12b, the storage devices 4b and 4c, the bowed point storage device 5b, the various parameter storage devices 5d, and the tables 16c and 16d are RO
The configuration is not limited to M, and a non-linear operation circuit that performs a predetermined operation on a supplied signal may be used.

The delays 7 and 9 described above are not limited to shift registers, but may be other delay means. Further, in the above-described embodiment, the bowed musical instrument has been described as a simulated natural musical instrument. However, the present invention is not limited to this.
Wind instruments may be used.

In the above-described embodiment, each component is realized by hardware.
It may be realized by software. In the above-described embodiment, the sound source is configured to synthesize a single tone signal. However, the present invention is not limited to this, and a plurality of tone signals may be synthesized by performing time-division processing.

[0050]

As described above, according to the present invention, a plurality of parameters corresponding to the performance are generated by the musical tone control means, and a parameter indicating the pitch of the plurality of parameters is generated. The higher the pitch indicated by the parameter , the higher the angle
A non-linear function in which the degree of angularity of the part is rounded is generated by non-linear function generation means, a signal based on the non-linear function is supplied to delay loop means in which a plurality of parameters are set, and the signal is output as a tone signal. Therefore, for example, by generating a nonlinear function in which the degree of blunting of the discontinuous point is adjusted in accordance with the parameter indicating the pitch input to the nonlinear function generating means, the nonlinear circuit is adjusted in accordance with the musical range of the musical sound. Is controlled, the noise can be reduced in the high tone range, and the tone can be synthesized in the low tone range without losing the characteristics of the tone of the natural musical instrument.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a sound source 6 in FIG.

FIG. 3 is a block diagram showing a configuration of a nonlinear circuit 12 in FIG. 2;

FIG. 4 is a conceptual diagram showing an excitation signal stored in a storage circuit 12b in FIG.

FIG. 5 is a block diagram showing a configuration of an excitation parameter forming circuit 4 in FIG. 1;

FIG. 6 is an explanatory diagram showing the contents stored in a storage device for bowing force in FIG. 5;

FIG. 7 is an explanatory diagram showing storage contents of a storage device for a bowing speed in FIG. 5;

8 is a block diagram showing a configuration of a linear system parameter forming circuit 5 in FIG.

FIG. 9 is an explanatory diagram showing storage contents of various parameter storage devices 5d in FIG.

FIG. 10 is a block diagram illustrating a configuration of a sound source according to a second embodiment.

11 is a block diagram showing a configuration of a nonlinear circuit 16 in FIG.

12A is a waveform chart showing a waveform stored in a table 16c in FIG. 11, and FIG. 12B is a waveform chart showing a waveform stored in a table 16d in FIG.

13A is a waveform diagram showing a waveform of an excitation signal in a low frequency range in the second embodiment, and FIG. 13B is a waveform diagram showing a waveform of an excitation signal in a high frequency range in the second embodiment.

FIG. 14 is a block diagram showing a configuration of a sound source using a conventional delay loop circuit.

15 is a waveform diagram showing a waveform of an excitation signal stored in the nonlinear circuit in FIG.

[Explanation of symbols]

4 ... excitation parameter forming circuit (tone control circuit), 5
... Linear system parameter forming circuit (musical tone control circuit), 1
2,16 ... non-linear circuit (non-linear function generating means), LO
OP, LOOP ₁ ... Delay loop circuit.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G10H 7/08 G10H 7/00

Claims (1)

(57) [Claims] 1. A tone control means for generating a plurality of parameters characterizing a tone according to a performance, and a non-linear function generating means for generating a different non-linear function in accordance with a parameter indicating a pitch among the plurality of parameters.
Wherein the degree of cornering of the corner of the nonlinear function is
The higher the pitch indicated by the parameter, the more the nonlinear function rounded
Generated, and circulates while delaying a signal based on the non-linear function,
An electronic musical instrument, comprising: delay loop means for processing the signal with a plurality of parameters, and outputting a signal circulating through the delay loop means as a tone signal.