JPH079592B2 - Music signal synthesizer - Google Patents

Description

The present invention relates to a musical tone signal synthesizer suitable for use in electronic musical instruments, game machines and the like, and more particularly to a musical tone signal synthesizer utilizing modulation.

[Prior art]

Conventionally, as a tone signal synthesizer using modulation, as shown in, for example, Japanese Examined Patent Publication No. 54-33525, a sequence of steps is performed in accordance with frequency data ωc representing a frequency having a predetermined multiple relationship with the frequency of a tone signal to be generated. Progressing phase data ωct
And modulation data Isinωmt representing each sample value of a sinusoidal modulation signal having a frequency ωm having a predetermined multiple relationship with the frequency of the tone signal (where I is the amplitude of the modulation signal, that is, the modulation index). Is added to the phase data ωct, and the tone signal sin (ωct + Isinωmt) is output by controlling the reading of the sine wave memory using the addition result ωct + Isinωmt as phase data (address data). Then, in this device, by changing the value of the modulation index I with time,
The modulation depth, that is, the overtone component contained in the tone signal sin (ωct + Isinωmt) is changed with time.

[Problems to be solved by the invention]

However, in the above-mentioned conventional device, the value of the modulation index I changes with time, but since it is constant with respect to the frequency of the tone signal to be generated, the frequency of the tone signal to be changed changes. However, the harmonic component contained in the same signal does not change. On the other hand, in a natural musical instrument, generally, when the pitch frequency of a musical tone changes, the harmonic components contained in the musical tone also change (for example, the harmonic component contained in the musical tone decreases as the musical tone frequency increases. Therefore, there is a problem in that the above-described conventional apparatus cannot be expected to synthesize a good tone signal.

In order to solve this problem, the value of the modulation index I may be changed according to the frequency of the tone signal to be generated, but in this case, the value of the modulation index I is changed. There is a problem that a circuit is required and the entire device becomes complicated.

The present invention has been devised in view of the above problems, and an object of the present invention is to provide a musical tone signal synthesizing device capable of synthesizing excellent musical tone signals by utilizing modulation without complicating the entire device. To provide.

[Means for solving problems]

In order to solve the above problems and achieve the object of the present invention, the structural feature of the present invention is, as shown in FIG. 1, representing a frequency having a predetermined multiple relationship with the frequency of a tone signal to be generated. Frequency data generating means 1 for outputting frequency data, modulation data generating means 2 for sequentially outputting modulation data representing each sample value of a modulation signal having a frequency that is in a predetermined multiple relationship with the frequency of the tone signal, and the frequency An arithmetic means 3 for adding or subtracting the data and the modulated data, and an accumulating value that changes corresponding to the arithmetic result by performing an accumulating operation based on the arithmetic result by the arithmetic means 3 are output as phase data. The phase data generating means 4 and the waveform generating means 5 for outputting predetermined waveform data according to the phase data from the phase data generating means 4 are provided.

[Operation of the invention]

First, in order to explain the basic operation of the present invention configured as described above, the modulation data generating means 2 outputs the modulation data relating to the modulation signal changing sinusoidally, and the waveform generating means 5 outputs the sine wave. Shall generate waveform data. In this case, if the frequency data output from the frequency data generating means 1 is ωc and the frequency of the modulation signal is ωm, the arithmetic means 3 is supplied with the frequency data ωc from the frequency data generating means 1 and is modulated. The modulation data Isinωmt is supplied from the data generating means 2.
(However, I represents the amplitude of the modulation signal.) The calculating means 3 adds or subtracts these data ωc and Isinωmt and supplies them to the phase data generating means 4, and the phase data generating means 4 outputs the addition or subtraction result. Since the accumulated value that changes correspondingly is output as phase data, the output phase data is Becomes Then, this phase data is supplied to the waveform generating means 5, and the generating means 5 outputs the waveform data which changes in a sine wave shape in accordance with this phase data. The waveform data representing is output. Also, the formula expressing this tone signal is Since it is transformed as shown in FIG. Will be output.

In this case, the modulation index Contains the frequency ωm of the modulation signal, and this frequency ωm
Since m is related to the frequency of the musical tone signal to be generated by a predetermined multiple, and increases as the frequency of the musical tone signal increases, the modulation index Decreases as the frequency of the tone signal increases. As a result, as the frequency of the musical tone signal to be generated becomes higher, the modulation in the synthesis of the musical tone signal becomes shallower and the overtone component contained in the signal decreases.

Next, a case will be described in which the modulation data generation means 2 outputs modulation data relating to a modulation signal other than a sine wave, or the waveform generation means 5 outputs waveform data representing a waveform other than a sine wave. In this case, the modulation data generating means 2 together with the modulation data representing the modulation signal I ₁ sinωmt in the above case, the modulation signal I ₂ sin2ωm corresponding to the overtone component of the signal I ₁ sinωmt.
It is equivalent to outputting modulated data representing t, I ₃ sin 3ωmt, etc., or the waveform generating means 5 causes the tone signal to be generated. Along with the waveform data representing Tone signal corresponding to the harmonic component of Since it is equivalent to outputting the waveform data that expresses, etc., the overtone structure of the generated tone signal is more complicated than the above case, and the modulation index The same can be said for the above case. As a result, also in this case, as the frequency of the musical tone signal to be generated becomes higher, the overtone components contained in the synthesized musical tone signal decrease.

〔The invention's effect〕

As can be understood from the above description, according to the present invention, the accumulated value of the addition or subtraction result of the frequency data ωc and the modulation data (for example, Isinωmt) By controlling the generation of the waveform data by the waveform generating means 5 using the phase data as the phase data, the frequency of the tone signal changes without providing a circuit for changing and controlling the modulation index according to the frequency of the tone signal to be generated. Since the harmonic components included in the musical tone signal to be synthesized are changed in accordance with this, a good musical tone signal can be synthesized with a simple circuit configuration.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing an electronic musical instrument to which the musical tone signal synthesizer according to the present invention is applied.

This electronic musical instrument has a key information generating circuit 11. The key information generation circuit 11 detects a key pressed on the keyboard and outputs a key code KC indicating the key and a key-on signal KON indicating that the key is pressed. The output of the key information generation circuit 11 is connected to the frequency information memory 12. The frequency information memory 12 stores a plurality of frequency data each representing a pitch frequency corresponding to each key on the keyboard, and multiplies the frequency data ω _KC corresponding to the key code KC based on the supplied key code KC. Supply to one input of the device 13. Coefficient data P ₁ from the coefficient data generator 14 is supplied to the other input of the multiplier 13, and the multiplier 13 multiplies the frequency data ω _KC by the coefficient data P ₁ , Carrier wave frequency data ωc representing a frequency having a substantially integral multiple relationship with the pitch frequency corresponding to the key pressed on the keyboard is supplied to one input of the adder 15.

The frequency data ω _KC from the frequency information memory 12 is also supplied to one input of the multiplier 16,
The multiplier 16 _applies the coefficient data generator 14 to the frequency data ω _KC.
By multiplying the coefficient data P ₂ supplied to the other input from the carrier frequency data ωc, the modulation frequency data ωm, which is in an almost integral multiple relationship with the carrier frequency data ωc, is output. The output of the multiplier 16 is connected to the accumulator 17, and the accumulator 17 forms the modulated wave phase data ωmt by accumulating the modulated wave frequency data ωm at each sampling time t. The output of the accumulator 17 is connected to the sine wave memory 18. The sine wave memory 18 stores each sampled value of the sine wave, and the supplied modulation wave phase data ω
Addressed by mt, modulated wave data sinωmt representing a sine waveform is supplied to one input of the multiplier 21 at every sampling time t. The multiplier 21 multiplies this data sinωmt by the modulation index data I (t) supplied to the other input to obtain the modulated wave waveform data I representing the modulated signal waveform.
(T) sinωmt is supplied to the other input of the adder 15. The modulation index data I (t) is supplied from the modulation index data generator 22, which generates time-varying modulation index data I (t) based on the key-on signal KON from the key information generation circuit 11. ) Is formed and output.

The output of the adder 15 is connected to the accumulator 23,
The accumulator 23 is the addition result ωc + in the adder 15.
By accumulating or integrating I (t) sinωmt, Is sequentially output. The output of the accumulator 23 is connected to the sine wave memory 24. Sine wave memory 24
Is a memory for storing each sampled value of the sine waveform, similar to the sine wave memory 18, and is a musical tone waveform data which is addressed by the supplied data and represents a musical tone signal waveform. Is supplied to one input of the multiplier 25. The multiplier 25 multiplies the musical tone waveform data by the amplitude envelope waveform data A (t) supplied to the other input, and represents the musical tone waveform data with the amplitude envelope. Is output. This amplitude envelope waveform data A (t)
Is supplied from the envelope waveform signal generator 26, which is the key-on signal from the key information generating circuit 11.
Amplitude envelope waveform data A (t) representing the amplitude envelope of the tone signal is formed and output based on KON.

The output of the multiplier 25 is connected to the D / A converter 27, and the converter 27 converts the digital data from the multiplier 25 into an analog signal and outputs it. The output of the D / A converter 27 is connected to the sound system 28. The sound system 28 is composed of an amplifier, a speaker, etc., and a D / A converter 27
Generates a musical sound corresponding to the analog signal supplied from.

Further, this electronic musical tone has a tone color information generating circuit 31. The tone color information generation circuit 31 outputs tone color selection data TC representing the tone color selected by the tone color selection operator.
TC is supplied to the coefficient data generator 14, the modulation index data generator 22 and the envelope waveform signal generator 26, respectively, and the coefficient data P ₁ and P ₁ output from the generators 14, 22 and 26, respectively. _{2. The} modulation index data I (t) and the amplitude envelope waveform data A (t) are changed and controlled according to the selected tone color.

The operation of the embodiment configured as described above will be described. When any key is pressed on the keyboard, the key information generation circuit 11 generates a key code KC indicating the pressed key and a key-on signal KON indicating the pressed key. When the key code KC is generated, the frequency information memory 12 supplies the frequency data ω _KC corresponding to the key code KC to one input of each of the multipliers 13 and 16. At this time, to the other input of each of the multipliers 13 and 16, from the coefficient data generator 14 controlled by the tone color selection data TC from the tone color information generation circuit 31, the coefficient data P ₁ and P ₂ according to the selected tone color Are supplied to the multipliers 13 and 16, and the carrier frequency data ωc (= P ₁ ω _KC ) and the modulation wave frequency, which are in an integer multiple relationship with the pitch frequency corresponding to the key pressed on the keyboard, respectively. The data ωm (= P ₂ ω _KC ) is output. Also,
The generation of the key-on signal KON causes the modulation index data generator 22 and the envelope waveform signal generator 26 to change the modulation index data I (t) and time-dependent modulation index data I (t) corresponding to the selected timbre represented by the timbre selection data TC. The amplitude envelope waveform data A (t) is output.

In this way, when the carrier frequency data ωc, the modulated wave frequency data ωm, the modulation index data I (t) and the amplitude envelope waveform data A (t) are output, the adder 1
5, the accumulator 17, the sine wave memory 18, the multiplier 21, the accumulator 23, the sine wave memory 24 and the multiplier 25, the operation of the musical tone waveform data. Are formed and sequentially output to the D / A converter 27. Since the D / A converter 27 converts the waveform data into an analog signal and supplies the analog signal to the sound system 28, the sound system 28 produces a musical sound corresponding to the waveform data.

Next, in order to understand the overtone structure included in the musical sound thus pronounced, Try to transform. In this case, the modulation index data I (t) changes with time, but changes extremely slowly compared to the cycle of the musical tone, and can be regarded as constant when analyzing the overtone structure of the musical tone at a certain time. Therefore, the above equation can be modified as follows.

According to a modification of this equation, the waveform data from the sound system 28 The musical sound corresponding to will be pronounced. In this case, the modulation index that determines the modulation depth Contains the modulation wave index data ωm. Becomes smaller as the same data ωm becomes larger. This modulation frequency data ωm is represented by P ₂ ω _KC , and the frequency data ω _KC increases as the key pitch increases, that is, the pitch frequency of the musical tone to be generated increases, so the modulation index Becomes smaller as the pitch frequency of the musical sound to be generated becomes higher. As a result, the modulation becomes shallower as the pitch frequency of the musical tone to be generated becomes higher, and the overtone component contained in the musical tone tends to decrease. This tendency is the same as the characteristic of the musical tone generated in a general natural musical instrument, and according to the above-described embodiment, the synthesis of the musical tone of the natural musical instrument or the like having the above tendency becomes good.

Next, another embodiment of the present invention will be described. FIG. 3 shows a tone signal synthesizer according to another embodiment of the present invention.
This device corresponds to the part surrounded by the one-dot chain line in FIG.

This tone signal synthesizer is configured to calculate one sample value of a tone waveform by a time-division operation of four time slots. In order to control the operation mode for each of the first to fourth time slots, the operation mode control signal is used. It has a generator 41. The calculation mode control signal generator 41 includes a tone color information generation circuit 31 (second
Various control signals SEL, GT1, GT2, SLOT, ACLR for controlling various calculation modes are output in synchronization with the clock signal φ according to the tone color selection data TC from FIG. Note that one cycle of the clock signal φ corresponds to one time slot.

Explaining an arithmetic unit whose arithmetic mode is controlled by the arithmetic mode control signal generator 41, this apparatus is a multiplier 42 which inputs the frequency data ω _KC from the frequency information memory 12 (FIG. 2) at one input. Have. A coefficient data generator 43 is connected to the other input of the multiplier 42.
43 is a first designated by the time slot signal SLOT (“0” to “3”) from the operation mode control signal generator 41.
Through every fourth time slot, coefficient data P _{11 to} P ₁₄ corresponding to the tone color selection data TC are output. This allows the multiplier
42 carrier frequency data ωc ₁ ~ωc ₄ multiplied by the coefficient data P ₁₁ to P ₁₄ to the frequency data _{ω KC (= P 11 ω KC} ~P
₁₄ ω _KC ) to one input of adder 44. Note that the carrier wave frequency data ωc _{1 to} ωc ₄ have a substantially integral multiple relationship with the pitch frequency corresponding to the key pressed on the keyboard, as in the above embodiment.

The output of the adder 44 is connected to the accumulator 45.
The accumulator 45, as shown in FIG. 4, is an adder 45a.
And a gate circuit 45b controlled by a clear signal CLR supplied via an inverter IN (ON when the clear signal CLR is "0", OFF when the same signal CLR is "1"), and a shift by the clock signal φ It is composed of a 4-stage shift register 45c which stores data of 4 channels which are controlled and correspond to the 1st to 4th time slots, and when the clear signal CLR is "0", the data from the adder 44 and the shift register The data from the final stage of 45c is added by the adder 45a, and the addition result is output via the gate circuit 45b and input to the first stage of the shift register 45c. When the clear signal CLR is "1", the data representing "0" is output, and the data is input to the first stage of the shift register 45c to clear the data stored in the same stage. There is. A differentiation circuit 46 is connected to the accumulator 45. The differentiating circuit 46 rises and differentiates the key-on signal KON from the key information generating circuit 11 (Fig. 2) to generate a key-on pulse signal KONP ("1") having a pulse width of 4 time slots synchronized with the clock signal φ. The clear signal CLR is output to the accumulator 45.

The output of the accumulator 45 is connected to the sine wave memory 47. The sine wave memory 47 is the sine wave memory 18, 2 of the above embodiment.
It is configured similarly to FIG. 4 (FIG. 2) and supplies to one input of the multiplier 48 waveform data representing a modulated wave waveform or a musical tone waveform, which is addressed by the data supplied for each time slot. The multiplier 48 multiplies this waveform data by the function waveform data supplied to the other input, and outputs it. This function waveform data is supplied from the function generator 51, which generates a key-on signal KON, tone color selection data TC, a time slot signal SLOT and a clock signal φ.
Function waveform data corresponding to the modulation index data I ₁ (t) to I ₃ (t) and the amplitude envelope waveform data A (t), which are controlled according to the selected tone color and change with time. Form and output for each time slot.

The output of the multiplier 48 is connected to the gate circuit 52, which is turned on when the second gate signal GT2 is "1" to turn on the multiplier 4
The waveform data from 8 is output, and when the same signal GT2 is “0”, it is turned off and the output of the same data is prohibited. The output of the gate circuit 52 is connected to the accumulator 53. The accumulator 53 accumulates the input data for each clock signal φ (1 time slot) and is cleared by the all clear signal ACLR. The accumulated result is D / A converter 27 (Fig. 2). Output to.

The output of the multiplier 48 is input to the other input of the adder 44 via the delay circuits 54 and 55, the selector circuit 56 and the gate circuit 57 in order to use the waveform data from the multiplier 48 as a modulation signal. It is connected. The delay circuit 54 uses the clock signal φ
The delayed waveform data obtained by delaying the waveform data from the multiplier 48 by one time slot is supplied to one input (“0”) of the selector circuit 56. The delay circuit 55 is controlled by the clock signal φ and outputs the waveform data from the multiplier 48 to 4
Delay waveform data delayed by one sample time of the tone waveform, that is, one sample time of the tone waveform is supplied to the other input (“1”) of the selector circuit 56. The selection signal SEL is supplied to the selection control input of the selector circuit 56.
When EL is "0", the delayed waveform data from the delay circuit 54 is selected and output, and when the signal SEL is "1", the delayed waveform data from the delay circuit 55 is selectively output. The output of the selector circuit 56 is connected to the gate circuit 57, and the gate circuit 57 is the first
When the gate signal GT1 is "1", it is turned on to supply the delayed waveform data from the selector circuit 56 to the other input of the adder 44,
When the signal GT1 is "0", the signal is turned off to stop the supply of the delayed waveform data.

The operation of another embodiment configured as described above will be described. When any key is pressed on the keyboard, the frequency data ω _KC and the key-on signal KON relating to the key pressed by the tone signal synthesizer shown in FIG. 3 are generated as in the case of the embodiment shown in FIG. Supplied. By supplying the key-on signal KON, the differentiating circuit 46 outputs the key-on pulse signal KONP for four time slots obtained by differentiating the signal KON to differentiate it to the accumulator 45 as the clear signal CLR.
The gate circuit 45b is turned off by the shift register 45c.
The stored data of all the stages, that is, the stored data of all the channels of the accumulator 45 are cleared when a key is pressed on the keyboard, that is, when the generation of a musical sound is started.

After that, the musical tone signal synthesizer concerned generates the frequency data ω.
The synthesis of the tone signal is started based on _KC and the key-on signal KON. In the synthesis of the tone signals, various calculations are performed under the control of the calculation mode control signal generator 41. As an example, various signals SL output from the generator 41 are used.
A case where OT, GT1, GT2, SEL, ACLR change as shown in FIG. 5 over the first to fourth time slots will be described.

When the time slot signal SLOT is “0”, that is, in the first time slot, the coefficient data generator 43 and the relationship generator 51 are controlled by the signal SLOT (= “0”), and the tone color selection data TC is used. The coefficient data P ₁₁ and the modulation index data I ₁ (t) corresponding to the represented timbre are output. Based on the output of the coefficient data P ₁₁ , the multiplier 42 calculates the carrier frequency data ωc ₁ (= P ₁₁ ω _KC ) and the adder 4
Supply to one input of 4. In addition, the selection signal SEL and the first
Since the gate signals GT1 are both "1", the other input of the adder 44 is the waveform data output by the multiplier 48 and delayed by the delay circuit 55 by four time slots, that is, the first sample before one sample. The waveform data G ₁ (t-1) formed in one time slot is the selector circuit 56 and the gate circuit 57.
Is being supplied through. Thereby, the adder 44 adds the waveform data G ₁ (t-1) to the carrier frequency data ωc ₁ as a modulated wave signal, and the addition result ωc ₁ + G ₁ (t-1).
Is supplied to the accumulator 45. The accumulator 45 accumulates the data ωc ₁ G ₁ (t-1) using the first channel and outputs the accumulation result. Is supplied to the sine wave memory 47. The sine wave memory 47 is addressed by the accumulation result and the waveform data To the multiplier 48, and the multiplier 48 multiplies the waveform data by the modulation index data I ₁ (t) from the function generator 51 to obtain the waveform data. Is output. This waveform data G ₁ (t) is supplied to the delay circuit 55, and is used again as the modulated signal in the first time slot after one sample as described above. Thus, the result of forming the waveform data G ₁ own waveform data G ₁ a (t-1) as a modulation signal (t), the waveform data G ₁ by a self feedback modulation method in the first time slot (t) It can be understood that

Since the second gate signal GT2 is "0" in the first time slot, the gate circuit 52 is in the off state and the waveform data G ₁ (t) from the multiplier 48 is supplied to the accumulator 53. Not done. Also, all clear signal ACLR
Is "1" and the data stored in the accumulator 53 is "0"
Will be cleared.

Next, the time slot signal SLOT is "1", "2",
The formation of waveform data G ₂ (t), G ₃ (t), G ₄ (t) in the case of “3”, that is, in the second to fourth time slots will be described. In these cases, the coefficient data generator
43 outputs the coefficient data P _{12 to} P ₁₄ according to the selected tone color for each time slot in the same manner as in the above case, and the function generator 51 outputs the modulation index data I for each time slot.
₂ (t), I ₃ (t) and amplitude envelope waveform data A
(T) is output. The output of these coefficient data P _{12 to} P ₁₄ causes the multiplier 42 to perform carrier frequency data ωc ₂ (= P) for each time slot in the same manner as described above.
₁₂ ω _KC ), ωc ₃ (= P ₁₃ ω _KC ), ωc ₄ (= P ₁₄ ω _KC )
Are calculated and supplied to one input of the adder 44, respectively. On the other hand, in these time slots, the selection signal SEL
Is "0" and the first gate signal GT1 is "1", so that the other input of the adder 44 is output by the multiplier 48 and delayed by one time slot by the delay circuit 54. The waveform data, that is, the waveform data G ₁ (t), G ₂ (t), and G ₃ (t) formed in the first to third time slots are supplied via the selector circuit 56 and the gate circuit 57, respectively. As a result, the adder 44 causes the carrier frequency data ω
waveform data G ₁ (t), G ₂ (t), c ₂ , ωc ₃ and ωc ₄
G ₃ (t) is added as each modulation signal, and the addition result ωc
₂ + G ₁ (t), ωc ₃ + G ₂ (t), and ωc ₄ + G ₃ (t) are supplied to the accumulator 45 for each time slot.

The accumulator 45 outputs the data ωc ₂ + G ₁ (t), ωc ₃
+ G ₂ (t) and ωc ₄ + G ₃ (t) are respectively accumulated using the second to third channels, and the accumulated data Is supplied to the sine wave memory 47 for each time slot. The sine wave memory 47 is addressed by the accumulated data, and the waveform data Is output to the multiplier 48 for each time slot. Multiplier 48
Outputs each of the waveform data by multiplying the modulation index data I ₂ (t), I ₃ (t) from the function generator 51 and the amplitude envelope waveform data A (t). Waveform data G output every third time slot
₂ (t), G ₃ (t) and G ₄ (t) are as follows.

As described above, the waveform data G ₂ (t), G ₃ (t), and G ₄ (t) are the modulated data, that is, one time for the waveform data G ₁ (t), G ₂ (t), and G ₃ (t). It can be understood that, as a result of forming the waveform data before the slot as the modulation signal, the waveform data is formed by the multiplex modulation method in the second to fourth time slots.

Waveform data G ₂ (t), G formed as described above
₃ (t) and G ₄ (t) are supplied to the gate circuit 52, but the second
And in the third time slot, the second gate signal GT
Since 2 is "0" and the gate circuit 52 is off, the waveform data G ₂ (t) and G ₃ (t) are not supplied to the accumulator 53. Further, in the fourth time slot, the gate circuit 52 and a second gate signal GT2 is "1" so on, the coefficient data G ₄ (t) is supplied to the accumulator 53. As a result, the accumulator 53
Outputs the waveform data G ₄ (t) as tone waveform data in the fourth time slot based on the all clear signal ACLR at “0” over the second to fourth time slots. This tone waveform data is supplied to the D / A converter 27 shown in FIG.

As can be understood from the above description, the carrier frequency data ωc _{1 to} ωc ₄ and the modulated wave waveform data G ₁ are also applied to the adder 44 and the accumulator 45 in the other embodiments.
(T-1), G ₁ (t), G ₂ (t), G ₃ (t) addition result ωc ₁ + G ₁ (t-1), ωc ₂ + G ₁ (t), ωc ₃ + G ₂
(T), ωc ₄ + G ₃ (t) are integrated and represented by each modulated wave waveform data G ₁ (t-1), G ₁ (t), G ₂ (t), G ₃ (t) The signal is a frequency component (eg, ω) that has an integer multiple relationship with the pitch frequency corresponding to the key pressed on the keyboard.
c ₁ , ωc ₂ , ωc ₃ , ωc ₁ + ωc ₂ , ωc ₂ + ωc
Since the sum of the signals having a _{3 ...,} etc.), with a case similar to the tendency of the harmonic components included in the musical tone is reduced in accordance with the tone pitch frequency of the tone to be generated is increased in the above embodiment. As a result, also in the other embodiments, the same effect as that of the above embodiment is achieved. Further, in the other embodiment, since the tone signals are synthesized by utilizing the self-feedback modulation system and the multiple modulation system, the overtone components of the generated tone are enriched and the synthesis of the tone having a complicated waveform is possible. It will be possible.

In the description of the operation of the other embodiment, only one example of the arithmetic mode used for forming the musical tone waveform data has been described. However, the musical tone signal synthesizing device according to the other example is the arithmetic mode control signal generator. Various signals from 41 GT1, GT2, SEL, ACLR
By changing the above, it is possible to change and control the calculation mode to form various musical tone waveform data.

Further, in the above embodiment and other embodiments, the carrier frequency data ωc and the modulated wave frequency data ωm are set such that the frequency represented by the data ωc, ωm has a substantially integral multiple relationship with the pitch frequency. However, the respective data ωc, ωm may be set such that the frequency represented by the data ωc, ωm has a non-integer multiple relationship with the pitch frequency. As a result, the tones to be produced can contain non-integer multiple harmonic components, and the degree of freedom in tone color control of the tones is increased.

In addition, in the above embodiment and other embodiments, the adder 1
5,44, the carrier frequency data ωc and the modulated wave waveform data I (t) sin ωmt are added, and the addition result ωc + I
Although (t) sinωmt is supplied to the accumulators 17,45, the adders 15 and 44 are replaced by subtractors, and the subtraction result ωc-I (t) sinωmt (or I (t) s
inωmt−ωc) may be supplied to the accumulators 15, 44. Even in this case, since the phase of the modulation signal is only shifted, the same effect as that of the above-mentioned embodiment and the other embodiment can be achieved.

Further, in the above embodiment and other embodiments, the sine wave memory 18, 24, 27 is used as the waveform memory, but the memory 18, 24, 47 is used as a sawtooth wave waveform, a triangular wave waveform, and other complicated waveforms. It may be replaced with a memory that stores waveform data representing various waveforms. According to this, the waveform data itself read from the waveform memory represents a waveform including many harmonic components, and thus the synthesized tone contains more harmonic components. Further, instead of the waveform memories 18, 24, 47, an arithmetic circuit for calculating the periodic waveform by calculation may be provided, and the waveform data may be formed and output by the calculation.

In addition, in the above-described embodiment and other embodiments, the sum value ωc + I (t) sin of the carrier frequency data ωc and the modulated wave waveform data I (t) sinωmt is accumulated by the accumulators 17, 45.
I tried to accumulate ωmt at a constant clock frequency,
A clock for determining the accumulation timing may be modulated by the added value ωc + I (t) sinωmt, and a constant value may be accumulated by the modulated clock. Also in this case, the accumulated value as the address data supplied from the accumulators 17 and 45 to the sine wave memories 18 and 47 is the same as that in the above-mentioned embodiments and other embodiments. Further, in this case, the accumulators 17 and 45 may be replaced with a counter that increments the count value by a predetermined value according to the input clock.

Further, although the present invention is applied to the self-feedback modulation method and the multiplex multiplex modulation method in the above-mentioned other embodiments, the present invention may be applied to the multi-sequence modulation method and the multinomial modulation method. According to this, the musical tone waveform data G (t) is formed by the following calculation, for example.

Further, in the above-mentioned embodiment and other embodiments, the musical tone signal synthesizing device is configured by a hard circuit, but the present invention is applied to a computer in which various calculations are executed by a program or the like, and a musical tone signal synthesizing device is provided. It may be composed of CPU, RAM, ROM, etc., which are parts of the computer. Further, the program may be supplied to the computer from an external recording medium such as a magnetic tape or a magnetic card to execute the calculation according to the present invention.

Further, in the above-mentioned embodiment and other embodiments, in addition to the current circuit for supplying the modulated wave waveform data I (t) sinωmt as it is to the adders 15 and 44, this modulated wave waveform data I
A circuit for supplying the multiplication result ωmI (t) sin ωmt of (t) sin ωmt and the modulated wave frequency data ωm to the adders 15 and 44 is provided, and both circuits are selectively switched and used. Good. According to this, when the multiplication result ωmI (t) sin ωmt is supplied to the adders 15 and 44, the modulation index in the above-mentioned embodiment and other embodiments Since the denominator ωm is canceled out and the modulation index becomes I (t), even if the tone synthesis mode and the tone frequency of the tone change, the overtone component changes even if the tone frequency of the tone changes. It is possible to selectively use the tone synthesis mode in the conventional device which does not change.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to the configuration of the present invention described in the claims, FIG. 2 is an overall block diagram of an electronic musical instrument according to an embodiment of the present invention, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a block diagram of a tone signal synthesizer according to an example, FIG. 4 is a detailed view of the 4-channel accumulator of FIG. 3, and FIG. 5 is a time chart for explaining the operation of the tone signal synthesizer of FIG. . Explanation of code 11 …… Key information generation circuit, 12 …… Frequency information memory, 13,1
6,21,25,42,48 …… Multiplier, 14,43 …… Coefficient data generator, 15,44 …… Adder, 17,45,53 …… Accumulator, 1
8, 24, 47 ... Sine wave memory, 22 ... Modulation index data generator, 26 ... Envelope waveform signal generator, 41 ... Calculation mode control signal generator, 51 ... Function generator, 54, 55 ... … Delay circuit, 56 …… Selector circuit.

Claims (1)

[Claims] 1. A frequency data generating means for outputting frequency data representing a frequency having a predetermined multiple relationship with the frequency of a tone signal to be generated, and a modulation signal having a frequency having a predetermined multiple relationship with the frequency of the tone signal. Modulation data generating means for sequentially outputting the modulation data representing each sample value of, the operation means for adding or subtracting the frequency data and the modulation data, by performing the accumulation operation based on the operation result by the operation means Phase data generating means for outputting a cumulative value that changes in accordance with the calculation result as phase data; and waveform generating means for outputting predetermined waveform data according to the phase data from the phase data generating means. A musical tone signal synthesizing device characterized in that a musical tone signal is obtained based on waveform data output from a generating means.