JPH0519770A - Device and method for musical sound synthesis - Google Patents

Abstract

PURPOSE:To easily realize timbre control corresponding to playing operation (e.g. variation in the closing extent of lips) performed on a wind instrument such as a trumpet and a clarinet. CONSTITUTION:A filter coefficient generation part 13 controls the operations of digital filters constituting an acoustic vibration simulation part 11 and a mechanical vibration simulation part 12 under control over a spring constant K equivalent to control over the closing extent of the lips or control over compliance C1 equivalent to capacity control for widening or narrowing down the mouth in the actual playing operation of the wind instrument, and controls timber un corresponding to a desired musical instrument as a result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a musical tone synthesizing apparatus for synthesizing a tone color that is particularly acoustic, that is, a tone color similar to that of a natural musical instrument among electronic musical instruments.

[0002]

2. Description of the Related Art In recent years, a digital sound synthesis system has been introduced into electronic musical instruments, and the quality of synthesized sound has been remarkably improved. Remember the musical tone waveform of a natural musical instrument,
A so-called PC that plays at a speed proportional to the pitch to be played
Although a method based on the M method is often used, many musical tone synthesis methods have been proposed in which an actual sounding structure of a natural musical instrument is simulated by an electronic circuit.

Such a function is described, for example, in the literature ("On
theoscillation of musical
instruments ", ME McInt-y
reR. T. Schumacher J. Wo-odh
co-author, J. Accout. soc. Am 7
4 (5), November 1983, p1325-
p1345)).

A conventional tone synthesizer will be described below. FIG. 12 is a block diagram showing the configuration of a conventional musical sound synthesizer. Before describing FIG. 12, FIGS.
The principle will be described with reference to FIG.

FIG. 9 shows a sectional view of the clarinet in a performance operation state. In FIG. 9, the left end A corresponds to the mouthpiece and the like, and its lead portion is covered with a mouth having an oral pressure q _m . In addition, all tone holes are assumed to be closed. Due to the pressure difference between the oral cavity pressure q _m and the intraluminal pressure q immediately below the lead, a flow velocity f is generated near the lead. The flow velocity f forms the traveling wave pressure qo (= f · z) via the characteristic impedance z in the pipe. The traveling wave pressure q _o is emitted and reflected at the right end BI after traveling from the left end A to the right end B (open end portion) in FIG. 9. The reflected pressure q _i can be obtained by convoluting the traveling wave pressure q o and the reflection coefficient r (t) as shown in FIG. The reflected wave pressure q _i is
By advancing in the pipe from the right end B to the left end A and changing the pipe pressure q (= q _o + q _i ) immediately below the lead, the flow velocity f determined from the oral pressure q _m and the pipe pressure q from the relationship shown in FIG. Will occur near the lead. By repeating the above operation, the pronunciation of the clarinet is repeated.

The reflection coefficient r of FIG. 11 is 4 for the clarinet.
Since it is a one-wavelength tube, if the time period of the output pitch is T, the time length corresponding to the round-trip path from the right end B to the left end A due to reflection at the left end A to the right end B, and further at the right end B. It can be seen that the reflection peaks are concentrated at T / 2.

FIG. 10 shows the relationship among the pressure q in the tube immediately below the lead, the pressure q _{m in the} oral cavity, and the flow velocity f. Q in FIG.
_r corresponds to the restoring force of the lead.

In FIG. 12, reference numeral 120 denotes a drive unit, 121
Is a conversion unit, 122 is a delay unit, and 123 is a key-on processing unit.

The operation of the musical sound synthesizing apparatus configured as described above will be described below.

When a note signal indicating the pitch of a musical tone to be output to the musical tone synthesizer, a key-on signal indicating the timing of sounding, and a touch signal indicating the strength of the output musical tone are input, The key-on processing unit 123 outputs a reset signal to the delay unit 122 in response to turning on of the key-on signal, outputs an ON signal to each unit after a predetermined time (Tr) has elapsed, and the operation of each unit starts. To be done. The drive unit 120 outputs data q _m of either initial touch when the musical sound to be output is a percussive sound such as a piano, or aftertouch when it is a non-percussive sound such as a clarinet, the ON signal output from the key-on processing unit 123 is ON. And outputs a zero value when the ON signal is OFF. The data q _m , which is the drive input to the conversion unit 121, may be scaled to have an appropriate value as the drive unit output.

The conversion unit 121 can be configured as shown in FIG. In FIG. 13, 130 is F
(Q) table, 131 is a multiplier, and 132 and 133 are adders. Conversion unit 12 including the above components
In the case of 1, the traveling wave pressure q _o output immediately before and the reflected wave pressure q _i output from the delay unit 122 are added by the adder 133, and the pipe internal pressure q immediately below the lead is obtained. F
(Q) The table 130 outputs the flow velocity f corresponding to the input pipe pressure q according to the relationship of FIG.

Flow velocity f output from the F (q) table
Is the characteristic impedance z of the tube in the multiplier 131.
And the reflected wave pressure q _i in the adder 132 after being multiplied by
Is added and output as the traveling wave pressure q _o .

The delay unit 122 can be constructed, for example, as shown in FIG. In FIG. 14, 160 is a reflection coefficient generator, 161 to 163 are unit delay devices, 171 to 17
Reference numeral 4 is a multiplier, and 165 is an accumulator.

The reflection coefficient generator 160 samples the reflection coefficient r (t) calculated based on the clarinet tube shape as shown in FIG. 11 every reference clock Cf [sec] to obtain the reflection coefficient r. (I ・ C
After calculating f) based on (Equation 1), each multiplier 17
1 to 174. However, i = 0, 1,
2, ..., 2N.

[0015]

[Equation 1]

Here, A and B are constants determined by the reflection characteristics of the assumed tube. N is a unit delay device 161-
The number is 163, which is a positive integer smaller by one than the number of multipliers 171 to 174. Here, assuming that the lowest sound output by the clarinet is 100 [Hz] and the frequency of the reference clock Cf is 20 [KHz], N is determined as in (Equation 2) in the case of a quarter-wave tube. can do.

[0017]

[Equation 2]

In the delay section 122, coefficient control for forming a pitch tone corresponding to a note signal is performed by the reflection coefficient generating section 160 in which each note signal (pitch), that is, time T.
R (i · Cf) obtained by (Equation 1) corresponding to
Are generated and then supplied to the multipliers 171 to 174.

As described above, the terminals 180, 1 shown in FIG.
The traveling wave pressure q _o and the reflected wave pressure q _i output from 81 are
Each as a digital musical tone, or the converter 121
Will be output as input to.

The digital tone output from the terminal 180 shown in FIG. 14 may be output from the terminal 185 in order to output it quickly.

For other musical instruments such as violin strings and pipe organs, musical sounds are synthesized by the same operation as that of the above-mentioned clarinet.

[0022]

However, in the above-mentioned conventional configuration, in the clarinet shown in FIG. 9, the performance operation for intentionally changing the tone of the performer (for example, changing the position of holding the mouthpiece, or When a control is performed in accordance with (changing the degree of tightening of the mouth), the operation of the portion where the playing operation is performed (near the mouth and the lead) is approximated by the circuit called the F (q) table 130, so F (q)
The data stored in the table 130 must be rewritten according to the control, that is, a huge memory capacity is required. In other words, it can be said that the control is difficult because the parameters controlled by the performance operation are not simulated in a clear manner.

The present invention solves the above-mentioned problems of the prior art, and in particular, a performance operation (for example, changing the tightness of the lips) performed in a wind instrument such as a trumpet or a clarinet.
It is an object of the present invention to provide a musical tone synthesizer capable of easily realizing tone color control corresponding to the above.

[0024]

In order to achieve this object, the musical tone synthesizer of the present invention uses an LRC circuit to detect acoustic behavior (changes in physical quantities such as pressure and volume flow velocity) in the wind instrument and in the player's mouth. And the acoustic vibration simulation part, the mechanical vibration simulation part that simulates the mechanical vibration of the reed (including the lip) that is the oscillation source with the vibration model consisting of the spring and the mass, and the acoustic vibration A filter forming a vibration simulating unit and a filter coefficient generating unit calculating a filter coefficient of a digital filter forming the mechanical vibration simulating unit.

[0025]

According to the present invention, in order to realize a performance operation such as changing the tightness of the lips, the present invention controls the spring constant of the mechanical vibration simulating section, and changes the behavior of the lips to produce an acoustic effect. Controls the operation of the vibration simulator.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a musical sound synthesizing apparatus according to an embodiment of the present invention. Before explaining FIG. 1, the sounding structure of the wind instrument (trumpet) shown in FIG. 5, the acoustic equivalent circuit of the trapeze shown in FIG. 6, the lead (lips) in the trumpet shown in FIG. 7 and its mechanical equivalent circuit, The leads and mouthpiece in the clarinet shown in FIG. 8 and their mechanical equivalent circuits will be described.

FIG. 5 shows a cross section of the player (left end) playing the trumpet. The blower pressure (pressure in the lungs) of the performer is p _o , the pressure in the mouth is p _i , the pressure in the mouthpiece is p ₂ , the pressure at the connection between the mouthpiece and the body is p ₃ , and as the pressure goes to the right side of the body, p ₄ , p ₅ , ...
., _Pn . Such an acoustic equivalent circuit is generally shown in FIG.
It is represented by an LRC circuit as shown in FIG. Here, since the lips of the performer are opening and closing at the time of performance, the acoustic resistance (L ₂ , R ₂ ) corresponding to the void portion of the lips is described as a variable resistance.

The acoustic equivalent circuit represented by using the LRC circuit in this way can be represented by the differential equation of the constant coefficient of (Equation 3).

[0030]

[Equation 3]

[0031]

[Equation 4]

[0032]

[Equation 5]

[0033]

[Equation 6]

FIG. 7A shows a cross section of the lead (lips) in the trumpet, and the interval between the upper lip and the lower lip is 2y. FIG. 7B shows a mechanical equivalent circuit of the lead in the trumpet. Here, for simplicity, the upper lip and the lower lip are assumed to be symmetrical, and only the lower lip is represented by an equivalent circuit. The mass of the lower lip is the mass point (mass is m),
The tension (tightness) of the lower lip corresponds to the elasticity of the blade (the spring constant is k). Further, the center line of FIG. 7A corresponds to 0 of the x coordinate of FIG. 7B. Pressure p ₁ inside the mouth and pressure P ₂ inside the mouthpiece as the performer blows
Occurs. p ₁ acts on the lower lip in the downward direction (direction to open the lip), and p ₂ acts on the lower lip in the upward direction (direction to close the lip). Therefore, considering the pressures p ₁ and p ₂ as the force dimensions, the direction of the external force acting on the mass point is as shown in FIG. 7. Also, in consideration of the air resistance of the lower lip, the attenuation term μ due to the attenuator is assumed to work on the mass point.

From the above, y can be expressed by the differential equation of the constant coefficient of (Equation 7).

[0036]

[Equation 7]

Similarly, FIG. 8A shows a cross section of the lead (lips) and the mouthpiece in the clarinet, and the interval between the mouthpiece and the lead is y. The difference from the case of the trumpet is that the polarity of the external force applied to the reed (mass point) is opposite. That is, the pressure p _{1 in} the mouth of the performer acts in the direction of closing the reed, and the pressure p ₂ in the mouthpiece
Works to open the lead.

From the above, y is (Equation 8), (Equation 9)
It can be represented by a differential equation with a constant coefficient of.

[0039]

[Equation 8]

[0040]

[Equation 9]

FIG. 1 shows a musical tone synthesizing device which simulates the above-described sound producing structure of a wind instrument by an electronic circuit. In FIG. 1, the acoustic vibration simulation unit 11 produces acoustic vibrations (changes in physical quantities such as sound pressure and volume flow velocity) in the wind instrument and in the mouth of the player as shown in FIG. 6 (LRC circuit). ) Is a block simulated by, and the blowing pressure of the performer (pressure in the lungs)
At, the time differential value dp ₀ / dt is input, and the volume flow velocity u ₀ radiated from the wind instrument (desired synthesized sound data) is output. The mechanical simulator and section 12 simulate the mechanical vibration of the reed (including the lips), which is the oscillation source, with a mechanical vibration model (model consisting of spring and mass) as shown in FIGS. 7 and 8. The acoustic resistances R ₃ and L ₃ in the acoustic vibration simulating unit 11 are input to the mouth pressure p ₁ and the pressure p ₂ in the mouthpiece sent from the acoustic vibration simulating unit 11. To decide.

Here, the acoustic vibration simulation unit 11,
The mechanical vibration simulating unit 12 both simulates using a digital circuit (digital filter). That is, the acoustic equivalent circuit by LRC shown in FIG. 6 and the vibration model shown in FIGS. 7B and 8B are converted into a digital circuit (digital filter) and described. Therefore, each parameter value L _i , R _i , C _i (i =
1, 2, ..., N) and each parameter value m, μ, k shown in FIGS. 7B and 8B needs to be associated with the filter coefficient of the digital filter. The block that performs this association is the filter coefficient generator 13. The filter coefficient generator 13 is preset (changeable)
L _i , R _i , C _i (i = 1, 2, 4, 5, ..., N) and m,
μ, k, and L ₃ and R ₃ input from the mechanical vibration simulating unit 12, the acoustic vibration simulating unit 11, the mechanical vibration simulator, and the filter coefficient a _i of the digital filter in the unit 12, b _i , c _i (i = 1, 2, ..., N) are calculated.

FIG. 2 shows a digital circuit diagram of the acoustic vibration simulating section 11 of the musical sound synthesizing apparatus in the embodiment of the present invention. In FIG. 2, the second-order digital filter 21 is a circuit corresponding to the left end closed loop (composed of pressure sources p ₀ , L ₁ , R ₁ , and C ₁ ) in the LRC equivalent circuit of FIG. Similarly, the second-order digital filter 22 is a circuit corresponding to the second closed loop (consisting of C ₁ , L ₂ , R ₂ and C ₂ ) from the left end in the LRC equivalent circuit of FIG. Similarly, the second-order digital filter 23
~ 24 are configured. These circuits can be generally obtained by z-transforming the differential equations of the constant coefficients shown in (Equation 3) to (Equation 6). The secondary digital filter 21 is composed of (Equation 10) to (Equation 16). Similarly, the secondary digital filter 22 is (Equation 17) to (Equation 23), the secondary digital filter 23 is (Equation 24) to (Equation 30), the secondary digital filter 2
4 is given by (Equation 31) to (Equation 37).

[0044]

[Equation 10]

[0045]

[Equation 11]

[0046]

[Equation 12]

[0047]

[Equation 13]

[0048]

[Equation 14]

[0049]

[Equation 15]

[0050]

[Equation 16]

[0051]

[Equation 17]

[0052]

[Equation 18]

[0053]

[Formula 19]

[0054]

[Equation 20]

[0055]

[Equation 21]

[0056]

[Equation 22]

[0057]

[Equation 23]

[0058]

[Equation 24]

[0059]

[Equation 25]

[0060]

[Equation 26]

[0061]

[Equation 27]

[0062]

[Equation 28]

[0063]

[Equation 29]

[0064]

[Equation 30]

[0065]

[Equation 31]

[0066]

[Equation 32]

[0067]

[Expression 33]

[0068]

[Equation 34]

[0069]

[Equation 35]

[0070]

[Equation 36]

[0071]

[Equation 37]

In the second-order digital filter 21,
201 is C in dp0 / dt in (Equation 10)_IMultiply by
Multiplier, multipliers 202, 205, 206 and adder 2
Feed consisting of 03,204 and price spreaders 207,208
The circuit of the back configuration has a transfer function H shown in (Equation 11).
_I(Z) is a circuit for executing. Note that the filter coefficient
a₁, B ₁, C₁Is calculated by (Equation 12) to (Equation 16)
This calculation is performed by the circuit shown in FIG. Also mechanical
P sent to the vibration simulating unit 12₁, P₂Is that
Re p₁Calculator 25, p₂The calculation unit 26 executes this. p₁Arithmetic
The output unit 25 calculates (Equation 38) as p₂Calculation unit 26
Is a circuit that executes.

[0073]

[Equation 38]

[0074]

[Formula 39]

FIG. 3 is a digital circuit diagram of the mechanical vibration simulating section 12 of the musical sound synthesizing apparatus according to the embodiment of the present invention.

In FIG. 3, the second-order digital filter 31 is a circuit corresponding to the vibration model of FIGS.
This circuit can be generally obtained by z-transforming the differential equation of the constant coefficient shown in (Equation 9). The secondary digital filter 31 is composed of (Formula 40) to (Formula 46).

[0077]

[Formula 40]

[0078]

[Formula 41]

[0079]

[Equation 42]

[0080]

[Equation 43]

[0081]

[Equation 44]

[0082]

[Equation 45]

[0083]

[Equation 46]

The selecting section 32 is a block for selecting a trumpet (a brass instrument) and a clarinet (a woodwind instrument). When the A input of the selector 36 is selected by the select signal s, y output by the circuit including the second-order digital filter 31 and the selection unit 32 is equivalent to the expression (7). . That is, the reed (lips) of a brass instrument such as a trumpet as shown in FIG. 7 is simulated. On the other hand, the select signal s
When the B input of the selector 36 is selected by, the y output by the circuit including the secondary digital filter 31 and the selection unit 32 is equivalent to the execution of (Equation 8) and (Equation 9). become. That is, the reed of a woodwind instrument such as a clarinet as shown in FIG. 7 is simulated. The table is a table for reading L ₂ shown in FIG. 6 with y as an address, and the table 34 is a table for reading R ₂ shown in FIG. 6 with y as an address.

FIG. 4 shows a musical tone synthesizing device according to an embodiment of the present invention.
2 shows a digital circuit diagram of the filter coefficient generator 13 of FIG.
It is a thing. In FIG. 4, the four arithmetic operations unit 41 is L_i, R_i，
C_iAnd r based on m, μ, k_i ², Q_i, 2q_i, K /
m, 1 / L_iC_iIs a circuit for calculating This operation is (number
Detailed circuit because it is a simple arithmetic operation as shown in 30)
Will be omitted. Table 42 is r_i ²With the address
Then {1 / (2r_i)} {Exp (-r_i) -Exp (-
r_i)} Is read from the table, and the table 43 is q _i2q
_iAddress as exp (-q_i), Exp
(-2q_i) Is read out, and table 44 is r_i ²
With {exp (-r_i) + Exp (-
r_i)} Is a table for reading. With these circuits
A_i, B_i, C_iIs calculated.

The operation of the musical tone synthesizer of this embodiment having the above-described structure will be described below. Figure 1
, The differential value dp ₀ / d of the player's blowing pressure p ₀
When t is input to the acoustic vibration simulating unit 11, the secondary digital filter 21 in FIG. 2 is u _I , the secondary digital filter 22 is u ₂ , the secondary digital filter 23 is u ₃ , and the secondary digital filter 23 is u 2. digital filter 24 of u _n
To calculate. u ₁ and u ₂ are sent to the p ₁ calculator 25 to calculate p ₁ . Similarly, u ₂ and u ₃ are sent to the p ₂ calculator 26 to calculate p ₂ . The p ₁ and p ₂ are sent to the mechanical vibration simulating unit 12. In FIG. 3, the vibration of the lead shown in FIGS. 7 and 8 is simulated. That is, (Equation 7) to (Equation 9) are executed to calculate y. Then, L ₂ and R ₂ are read out from the tables 33 and 34, and a series of arithmetic processing by (Equation 19) to (Equation 23) is performed in the filter coefficient generation unit 13 to calculate a ₂ , b ₂ , c _2. To be done. Similarly, L _i , R _i , and C _i (i =
1, 2, ..., N, except L ₂ , R ₂ ), m, μ, k, the filter coefficient calculation unit 13 a _i , b _i , c _i (i
= 1, 2, ..., N, but excluding a ₂ and b ₂ ) and a ₀ ,
Calculate b ₀ and c ₀ . The filter coefficients a _i , b _i and c _i (i = 1, 2, ..., N) thus obtained are stored in the acoustic vibration simulation unit 11 as a ₀ , b ₀ and c _0. To the filter unit 12 and the filter coefficients of the second-order digital filters 21, 22, 23, ...
The filter coefficient of the next digital filter 31 is determined. In this way, the acoustic vibration simulating unit 11 calculates u _n corresponding to the volume flow velocity at the opening end portion of FIG. The u _n can be treated as desired tone data.

As described above, according to the present embodiment, for example, the spring constant k corresponding to the control of the tightness of the lips performed in the actual operation of playing a wind instrument, or the volume control for expanding or narrowing the mouth is controlled. The filter coefficient generator 13 controls the operation of the digital filter, which is an internal configuration of the acoustic vibration simulating unit 11 and the mechanical vibration simulating unit 12, by controlling the compliance C ₁ corresponding to It is possible to control the tone color of the corresponding u _n .

Further, the mechanical vibration simulating section 12 is provided with the selecting section 32 as shown in FIG. 3, so that the trumpet (brass instrument) and the clarinet (only if the selecting signal s of the selecting section 32 is controlled). Woodwind instrument) can be selected.

Further, in the filter coefficient generator 13,
By providing the tables 42 and 44 as shown in FIG. 4 and referring to the tables 42 and 44 with r ² as an address without converting r ² (real number) into r (complex number), a _i and b _i can be obtained without complex. , C _i can be calculated.

[0090]

INDUSTRIAL APPLICABILITY As described above, the present invention provides an acoustic vibration simulation unit that simulates the acoustic behavior (changes in physical quantities such as pressure and volume flow velocity) in the wind instrument and in the mouth of a performer with an LRC circuit. , A mechanical vibration simulation part that simulates the mechanical vibration of the reed (including the lip) that is the oscillation source with a vibration model consisting of a spring and a mass point, an acoustic vibration simulation part and a mechanical vibration simulation part. By providing a filter coefficient generator that calculates the filter coefficient of the digital filter that composes, the timbre control corresponding to the performance operation (for example, changing the tightness of the lips) performed in a wind instrument such as a trumpet or clarinet is easily realized. it can.

Further, the mechanical vibration simulating section is
A trumpet (a brass instrument) and a clarinet (a woodwind instrument) can be selected with a simple circuit configuration by providing a selector that selectively controls a parameter indicating the open / closed state of the reed.

Further, since the filter coefficient generator has the table, the filter coefficient can be calculated without complex calculation.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a musical sound synthesizer according to an embodiment of the present invention.

FIG. 2 is an acoustic vibration simulation unit 1 according to the embodiment.
1 is a circuit diagram showing an internal configuration of 1.

FIG. 3 is a mechanical vibration simulating unit 1 in the same embodiment.
2 is a circuit diagram showing the internal configuration of FIG.

FIG. 4 is a circuit diagram showing an internal configuration of a filter coefficient generator 13 in the embodiment.

FIG. 5 is a cross-sectional view showing a sounding structure of a trumpet.

6 is an acoustic equivalent circuit in which the sound generation structure of FIG. 5 is represented by an electric circuit.

FIG. 7A is a sectional view of a lip. (B) is an equivalent model diagram in which the lips are approximately represented by mass points, springs, and the like.

FIG. 8A is a cross-sectional view of a clarinet mouthpiece and a lead. (B) is an equivalent model diagram in which the leads of the clarinet are approximately represented by mass points and springs.

FIG. 9 is a sectional view showing a playing operation state of the clarinet.

FIG. 10 is a characteristic diagram showing the relationship between pressure and flow velocity in the vicinity of the reed in a clarinet playing operation state.

FIG. 11 is a characteristic diagram showing a reflection coefficient characteristic of the clarinet in a performance operation state.

FIG. 12 is a block diagram showing the configuration of a conventional musical sound synthesizer.

FIG. 13 is a block diagram showing an internal configuration of a conversion unit 121 in the conventional example.

FIG. 14 is a block diagram showing an internal configuration of a delay section 122 in the conventional example.

[Explanation of symbols]

11 Acoustic Vibration Simulation Section 12 Mechanical Vibration Simulation Section 13 Filter Coefficient Generation Sections 21-24, 31 Secondary Digital Filter 25 p ₁ Calculation Section 26 p ₂ Calculation Section 32 Selection Section 33, 34, 42-44 Table 41 arithmetic operation section

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 18, 1992

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takahiro Sugaya             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd.

Claims (4)

[Claims] 1. The acoustic behavior (change of physical quantity such as pressure and volume flow velocity) in the wind instrument and in the mouth of the player is L.
An acoustic vibration simulating section simulated by an RC circuit; a mechanical vibration simulating section simulating mechanical vibration of a reed (including a lip) as an oscillation source by a vibration model composed of a spring and a mass point; A musical sound synthesizing apparatus comprising: an acoustic vibration simulating unit; and a filter coefficient generating unit that calculates a filter coefficient of a digital filter that constitutes the inside of the mechanical vibration simulating unit. 2. The mechanical vibration simulating section includes a selecting section for selectively controlling a parameter indicating the open / closed state of the reed by designating a brass instrument or a woodwind instrument.
The described musical sound synthesizer. 3. The musical tone synthesizing apparatus according to claim 1, wherein the filter coefficient generating section includes a table which substitutes a complex number operation by referring to the table. 4. The acoustic behavior (change in physical quantity such as pressure and volume flow velocity) in the wind instrument and in the mouth of the player is L.
An acoustic vibration simulating means simulated by an RC circuit and a mechanical vibration simulating means simulating mechanical vibration of a reed (including a lip) which is an oscillation source by a vibration model composed of a spring and a mass point are provided. A musical sound synthesizing method comprising synthesizing a musical sound by controlling at least one acoustic resistance value of the acoustic simulating means with a parameter representing the open / closed state of the lead obtained by the mechanical vibration simulating means.