JP7158488B2 - Sound device and sound signal generator - Google Patents

Description

The present invention relates to an audio device and an audio signal generation program.

2. Description of the Related Art Conventionally, acoustic devices such as FM synthesizers are known as electronic musical instruments (see, for example, Patent Document 1).
An FM synthesizer modulates a carrier wave oscillated from a first oscillator with a modulating wave oscillated from a second oscillator to generate various acoustic signals. By generating an acoustic signal having a frequency corresponding to a keynote input by an electronic keyboard or the like connected to an FM synthesizer, it is possible to output sound with a musical scale.
According to the FM synthesizer, various acoustic signals can be generated by combining carrier waves and modulating waves, so it is possible to generate acoustic signals close to the timbres of ordinary musical instruments, and to generate acoustic signals with new timbres that have not existed in the past. has the effect of

JP-A-4-161994

By the way, in recent FM synthesizers, a plurality of combinations of the above-mentioned two oscillators are used, the sound signals output from each are added or multiplied, and the self-generated sound signal is looped as its own input to create a new sound. A signal is being generated.
In this case, conventionally, a plurality of combinations are restricted, and the waveform, frequency, amplification factor, etc. of each oscillator are adjusted according to preset combinations.

However, the preset combination method has a problem that the selection range of acoustic signals of new timbres that can be generated is limited.
On the other hand, even if the degree of freedom in combining oscillators is improved and the amount of adjustment for each oscillator can be freely set, it is still difficult for the operator to understand which parameters to adjust to affect the acoustic signal. . Therefore, there is a problem that it is very difficult to adjust and set each oscillator.
In addition, depending on the combination of oscillator parameter adjustments and settings, there is a problem that the scale of the generated acoustic signal may collapse and the instrument may not function.

An object of the present invention is to provide an audio device and an audio signal generation program that can freely generate new audio signals and can output audio signals with a musical scale without failing as a musical instrument. be.

The acoustic device of the present invention includes a plurality of acoustic signal generators that generate acoustic signals by modulating a carrier wave generated by an oscillator with an input modulated wave, and an adjustment operation unit that prompts an operator to make adjustments. , a plurality of feature quantity adjustment units for adjusting the feature quantity of the sound signal generated by each sound signal generation unit, and a synthesis obtained by adding or multiplying the sound signals generated by each sound signal generation unit an acoustic signal synthesizing unit for generating an acoustic signal; a signal strength estimating unit for estimating the signal strength of the synthesized acoustic signal to be output from the adjustment states of the plurality of feature amount adjusting units; and a limit amount notification unit for notifying the operator of the limit amount of the adjustment operation amount by the adjustment operation unit based on the estimated signal strength of the synthesized sound signal.
A computer-readable audio signal generation program of the present invention causes a computer to function as the audio device described above.

1 is a block diagram showing an acoustic device according to an embodiment of the present invention; FIG. FIG. 2 is a block diagram showing the structures of an acoustic signal generator and an acoustic signal synthesizer in the embodiment; 4 is a graph showing signal strength of an acoustic signal generated according to the waveform of the modulated wave in the embodiment; 4 is a graph showing the signal intensity of the synthesized acoustic signal in the embodiment; FIG. 2 is a block diagram showing an acoustic signal generator, an acoustic signal synthesizer, a signal strength estimator, and a limit amount annunciator in the embodiment; FIG. 3 is a block diagram showing a signal strength estimating section and a limit amount reporting section in the embodiment; 4 is a flow chart for explaining the operation of the embodiment;

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an FM (Frequency Modulation) synthesizer 1 according to an embodiment of the invention.
The FM synthesizer 1 includes a synthesizer main body 2 and an adjustment operation unit 3, generates an acoustic signal having a pitch corresponding to a keynote output from a MIDI keyboard 4, and outputs the sound to the outside. The adjustment operation unit 3 is provided with a plurality of adjustment knobs 32 for adjusting the gains and frequency ratios of the oscillators of the synthesizer main body 2. By operating the respective adjustment knobs 32, the operator operates the FM synthesizer section 6 for sound output. to generate acoustic signals of different tones.

The adjustment operation unit 3 has a box-shaped case 31 and a plurality of adjustment knobs 32 . In this embodiment, 4×4=16 adjustment knobs 32 are provided as adjustment operation units corresponding to the adjustable sound signal generation units OP1 to OP4 of the synthesizer body 2 .
Although the adjustment operation unit 3 is configured as hardware in the present embodiment, it is not limited to this. For example, it may be a feature amount adjustment unit configured as an image displayed on a computer screen.

As shown in FIG. 1, the synthesizer main body 2 generates an acoustic signal of a scale corresponding to the input keynote KNOTE, and outputs the sound. The synthesizer main body 2 includes a parameter selection section 5 , a sound output FM synthesizer section 6 , an analysis FM synthesizer section 7 , a noise component analysis section 8 and a noise reduction section 9 .
The parameter selection section 5 is a section that selects the waveform of the acoustic signal generated and output by the synthesizer body 2. Examples of selectable waveforms include a sine wave W1, a triangular wave W2, a sawtooth wave W3, and a rectangular wave W4. (See Figure 3). The selected waveform, frequency ratio, amplification factor of the output side amplifier 63A (see FIG. 2) and amplification factor of the input side amplifier 64A (see FIG. 2) are sent to the FM synthesizer section 6 for sound output and the FM synthesizer section 7 for analysis. output.

As shown in FIG. 2, the sound output FM synthesizer section 6 is composed of a DSP (Digital Signal Processor) and includes a plurality of sound signal generation sections OP1 to OP6.
Among them, the acoustic signal generator OP1 to the acoustic signal generator OP4 generate acoustic signals to be output based on the carrier wave and modulated wave used in the FM synthesizer unit 6 for sound output. Note that, in the present embodiment, an acoustic signal generation unit OP5 and an acoustic signal generation unit OP6 are separately provided. The acoustic signal generator OP5 and the acoustic signal generator OP6 perform modulation by a combination of existing preset oscillators, and are preliminarily provided.
The acoustic signal generator OP1 includes an oscillator 61, an amplifier 62, a signal output section 63, an output side amplifier 63A, and a modulated wave input section 64. The acoustic signal generator OP2 to the acoustic signal generator OP4 have the same configuration.

The oscillator 61 generates a carrier wave having a predetermined frequency ratio from the waveform selected by the parameter selection section 5, and modulates the carrier wave with the input modulating wave. Specifically, the oscillator 61 generates a carrier wave having a frequency corresponding to the key note KNOTE input from the MIDI keyboard 4, and modulates it with the modulating wave.
For example, if the modulated wave is a sine wave W1 as shown in FIG. Modulate with a ratio sine wave W1. The signal intensity of the acoustic signal output after modulation has a pattern PT1 peaking at the frequency f_in' corresponding to the keynote KNOTE.

Similarly, when the modulated wave is the triangular wave W2, the signal intensity of the modulated output acoustic signal is as shown in the pattern PT2, and when the modulated wave is the sawtooth wave W3, the modulated output acoustic signal is The signal intensity has a pattern PT3, and when the modulated wave is a rectangular wave W4, the signal intensity of the acoustic signal output after modulation has a pattern PT4.
That is, when the carrier wave is modulated by the modulating wave, an acoustic signal having a signal intensity peak at a frequency other than the frequency f_in' corresponding to the keynote KNOTE is generated depending on the waveform of the modulating wave.

Amplifier 62 amplifies the acoustic signal output from oscillator 61 . The amplification factor is set according to the output of the EG (envelope generator) and the strength of keystrokes on the MIDI keyboard 4 included in the keynote KNOTE.
The signal output section 63 outputs the acoustic signal generated by the oscillator 61 to the acoustic signal synthesizing section 65 . Further, the acoustic signal output from the signal output unit 63 is fed back to the modulated wave input unit 64 of the acoustic signal generation unit OP1, and the other acoustic signal generation unit OP2, the acoustic signal generation unit OP3, and the acoustic signal generation unit It is output to the modulated wave input section 64 of OP4.

Similarly, the acoustic signals output from the signal output units 63 of the acoustic signal generator OP2, the acoustic signal generator OP3, and the acoustic signal generator OP4 are also fed back to their own modulated wave input units 64, It is output to the modulated wave input section 64 of the acoustic signal generation section.
The modulated wave input section 64 includes a plurality of input side amplifiers 64A and input side adders 64B.
A plurality of input-side amplifiers 64A are provided according to the input acoustic signal. In the case of the acoustic signal generation unit OP1, the feedback acoustic signal output by itself and the other acoustic signal generation unit OP2 to the acoustic signal generation unit It amplifies the input acoustic signal generated in OP4. The amplification factor can be adjusted by adjusting the adjustment knob 32 of the adjustment operation unit 3 .
The input side adder 64B adds a plurality of acoustic signals input from the input side amplifier 64A and outputs the result to the oscillator 61 as a modulated wave.

In this embodiment, since the four acoustic signal generators OP1 to OP4 are provided, the acoustic signals amplified by the four input amplifiers 64A provided in front of the respective four oscillators 61 are Adjust the intensity of the to output the final acoustic signal. That is, in the present embodiment, 16 adjustments are possible, corresponding to the number of adjustment operation knobs 32 of the adjustment operation unit 3 .
In the present embodiment, since the FM synthesizer 1 includes the multi-input, single-output acoustic signal generators OP1 to OP4, it is possible to generate acoustic signals with a wide variety of timbres. However, on the other hand, it is impossible to predict how the adjustment operation unit 3 should be operated to generate an acoustic signal with a desired tone color, making the synthesizer extremely difficult for the operator to perform adjustment operations.

The signal output unit 63 outputs the acoustic signals generated by the acoustic signal generators OP1 to OP6.
The output amplifier 63A amplifies the acoustic signals generated by the acoustic signal generators OP1 to OP6 with a predetermined amplification factor. The amplification factor can be adjusted by adjusting the adjustment knob 32 of the adjustment operation unit 3 .

The acoustic signal synthesizing unit 65 adds or multiplies the acoustic signals output from the acoustic signal generating units OP<b>1 to OP<b>4 , and outputs the result as an acoustic signal for the FM synthesizer 1 . The acoustic signal synthesizing section 65 includes a first adder 66 , a filter section 67 , a second adder 68 and an amplifier 70 .
The first adder 66 adds the acoustic signals output from the acoustic signal generator OP1 to the acoustic signal generator OP4 to generate a synthetic acoustic signal for audio output. The first adder 66 also adds the outputs of the preliminary acoustic signal generator OP5 and the preliminary acoustic signal generator OP6.

The filter unit 67 filters the synthesized sound signal added by the first adder 66 . The filter of the filter section 67 is set to have desired filter characteristics in order to process the acoustic signal into a desired timbre.
The second adder 68 adds the output from the auxiliary sound signal generation unit OP5 without going through the filter unit 67, and whether or not to filter the output of the sound signal generation unit OP5 is determined by the switch in the preceding stage. 69 switching.
The amplifier 70 amplifies the synthesized acoustic signal to be output. The amplified synthetic sound signal is output as sound by a speaker or the like.

The synthesized acoustic signal to be output varies depending on the waveform and frequency ratio of the oscillators 61 of the acoustic signal generators OP1 to OP4, the amplification factor of the output side amplifier 63A, and the amplification factor of the input side amplifier 64A. For example, as the synthesized sound signal, a synthesized sound signal with a frequency different from the frequency f_in' corresponding to the input keynote KNOTE is output. For example, as shown in FIG. 4, in the case of modulation with a sine wave W1, the frequency f_in' takes the maximum value as in the output intensity pattern PO1, and the signal intensity of the frequency becomes therefore attenuates. Therefore, the listener can identify the scale of the output synthetic sound signal.

However, like the output intensity pattern PO2 modulated by the triangular wave W2 to the output intensity pattern PO4 modulated by the rectangular wave W4, the signal intensity of the frequency f_in' corresponding to the keynote KNOTE is gradually buried in the signal intensity of the other frequencies. I can't output the pitch according to the keynote KNOTE. In other words, no matter what keys the operator presses on the MIDI keyboard 4, only high-frequency noise sounds are output, and the instrument fails.
Therefore, the FM synthesizer 1 of the present embodiment is provided with a navigation function that can be operated so that the synthesized sound signal to be output is only high-frequency noise sound and the instrument fails.

As shown in FIG. 5, the analysis FM synthesizer unit 7 includes a plurality of sound signal generation units OP1′ to OP6′ each configured from a DSP similarly to the sound output FM synthesizer unit 6, and an output side amplifier. 72A, an adder 74, a signal strength estimation unit 75, and a limit amount notification unit 76.
Each of the acoustic signal generation units OP1′ to OP6′ includes an oscillator 71, a signal output unit 72, and a modulation signal input unit 73. FIG. The modulated signal input section 73 has an input side amplifier 73A and an input side adder 73B.

These configurations are similar to those of the acoustic signal generator OP1 to the acoustic signal generator OP6 of the FM synthesizer section 6 for sound output. A test keynote TNOTE generated in the synthesizer body 2 is input to each oscillator 71 , and the oscillator 71 generates a carrier wave corresponding to the frequency of the test keynote TNOTE by adjusting a plurality of adjustment knobs 32 . It modulates with a modulated wave generated according to the state.
The adder 74 adds or multiplies the acoustic signals respectively generated by the acoustic signal generators OP1′ to OP6′, and outputs the result to the signal strength estimator 75 as a synthesized acoustic signal.

The signal strength estimating section 75 and the limit amount reporting section 76 are configured as a program executed on an arithmetic processing unit of a computer (not shown) or a storage area secured on a storage device.
The signal strength estimation unit 75 includes a test keynote output unit 751, a synthesized sound signal detection unit 752, an operation amount change unit 753, a limit amount determination unit 754, and an adjustment knob selection unit 755, as shown in FIG. Further, the signal strength estimating section 75 outputs the number of each adjustment knob 32 of the adjustment operation unit 3 and the adjustment operation amount of the adjustment knob 32, and is used for limit amount judgment by the limit amount judgment section 754 described later. be.

The test keynote output unit 751 outputs a test keynote TNOTE to the sound signal generation units OP1' to OP6'. The acoustic signal generators OP1′ to OP6′ generate acoustic signals based on the test keynote TNOTE.
Further, the test keynote output unit 751 outputs the frequency corresponding to the output test keynote TNOTE to the limit amount determination unit 754 .

The adjustment knob selection unit 755 selects the adjustment knob 32 for adjusting the oscillator 71 from among the sound signal generation units OP1′ to OP6′. Specifically, the adjustment knob selection unit 755 selects the oscillator 71 to be adjusted, the modulated waveform of the oscillator 71, the intensity and frequency ratio of the output acoustic signal, and the Select the adjustment knob 32 that adjusts the strength of the acoustic signal. The adjustment knob selection section 755 outputs the selected adjustment knob 32 to the limit amount determination section 754 .

The synthesized sound signal detection unit 752 detects a synthesized sound signal obtained by synthesizing the sound signals generated by the sound signal generation units OP1′ to OP6′ added by the adder 74. FIG.
The synthesized acoustic signal detection unit 752 converts the detected synthesized acoustic signal into signal strength according to frequency by FFT (Fast Fourier Transform) or the like, acquires the signal strength distribution, and outputs the signal strength distribution to the limit amount determination unit 754. .

The operation amount changing unit 753, similar to the adjustment operation of the adjustment knob 32 of the adjustment operation unit 3, transmits the waveform, frequency ratio, and amplification of the modulated wave of each oscillator 71 from the sound signal generation unit OP1′ to the sound signal generation unit OP6′. and the adjustment operation amount of the amplification factor of the input side amplifier 73A. Specifically, the operation amount changing section 753 outputs a combination of adjustment operation amounts of all the adjustment knobs 32 as an adjustment operation amount according to the adjustment amount of each adjustment knob 32 of the adjustment operation unit 3 .
Further, the manipulated variable changing unit 753 outputs to the limit amount determining unit 754 the adjustment manipulated variable output from the acoustic signal generating unit OP1′ to the acoustic signal generating unit OP6′.

The limit amount determining section 754 determines the waveform of the modulated wave, the frequency ratio, the amplification factor of the output side amplifier 72A, and the amplification factor of the input side amplifier 73A, which are set based on the adjustment operation amount output from the operation amount changing section 753. It is determined whether or not the synthesized sound signal modulated by is broken when output as a sound. Specifically, the limit amount determination unit 754 uses the frequency corresponding to the test keynote TNOTE as the fundamental frequency, and determines the signal intensities of the fundamental tone, its second overtone, and third overtone, and other components contained in the synthesized sound signal. The presence or absence of breakdown in the synthesized sound signal to be output is determined based on the S/N ratio of the signal intensity of the frequency component of . With the frequency corresponding to the test keynote TNOTE as the fundamental frequency, the S/N ratio of the signal strength of the fundamental, second and third overtones and the signal strength of other frequency components contained in the synthesized sound signal is If it is smaller than the predetermined threshold, it is determined that the adjustment operation amount exceeds the limit amount and is broken.

Here, the synthesized sound signals generated by the sound signal generation units OP1′ to OP6′ are different from the sound signals generated by the same settings as those of the sound output FM synthesizer unit 6. The same setting as the setting of the synthesizer section 6 is generated by the setting when the adjustment knob 32 is operated at one position.
At this time, the adjustment operation unit 3 is in a state of operating the four oscillators 61 and the four input amplifiers 64A and 73A provided in the preceding stages of the oscillators 71, respectively. These 16 parameters can be adjusted by the 16 adjustment operation knobs 32 of the adjustment operation unit 3 .

When the operator operates one of the adjustment knobs 32, in addition to the operation, a state in which one of the adjustment knobs 32 is operated to a predetermined position is internally simulated, and the sound signal generator OP1 The 'to-acoustic signal generation unit OP6' generates a synthesized acoustic signal corresponding to the operating position of the adjustment knob 32 in the internally simulated state.
A limit amount determination unit 754 analyzes the synthesized sound signal and determines whether or not the limit amount has been reached.
The limit amount of the adjustment operation amount of each adjustment knob 32 determined by the limit amount determination unit 754 is output to the limit amount notification unit 76 .

The limit amount notification section 76 includes a control signal output section 761 and a notification state storage section 762 .
The control signal output unit 761 generates a lighting control signal based on the limit amount of the adjustment operation amount output from the limit amount determination unit 754, and visually indicates the adjustment knob 32 of the adjustment operation unit 3. Output to the LED light emitting unit 327 . Specifically, the control signal output unit 761 outputs a control signal that causes the LED light emitting unit 327 to emit green light when the adjustment operation amount of the adjustment knob 32 is equal to or less than the limit amount.

Further, the control signal output section 761 outputs a control signal for causing the LED light emitting section 327 to emit light in red when the adjustment operation amount of the adjustment knob 32 exceeds the limit amount.
In addition, the emission color of the LED light emitting unit 327 is not limited to two colors, and may be green when the adjustment operation amount is sufficiently smaller than the limit amount, yellow when the amount is close to the limit amount, and red when the limit amount is exceeded. It may be configured to display in multiple stages.

The notification state storage unit 762 is configured as part of a storage area of a recording medium such as memory. The notification state storage unit 762 stores the limit amount of the adjustment operation amount of the adjustment knob 32 determined by the limit amount determination unit 754 . When the limit amount of the adjustment operation amount of each adjustment knob 32 is calculated, the limit amount determination unit 754 rewrites the previous limit amount to a new limit amount of the adjustment operation amount.

Next, the operation of this embodiment will be described based on the flowchart shown in FIG.
When the FM synthesizer 1 is activated (step S1), the control signal output section 761 reads the previous adjustment state from the notification state storage section 762 (step S2).
The control signal output section 761 outputs a control signal based on the previous adjustment state to the adjustment operation unit 3, and causes the LED light emission section 327 of the adjustment knob 32 in each of the adjustment operation units 3 to return to the previous adjustment state of the adjustment knob 32. luminescence is displayed accordingly.
Specifically, the LED light-emitting portion 327 corresponding to the adjustment knob 32 that does not affect the sound at all is turned off, indicating that it does not affect the sound. If so, it becomes an estimation target and the result is displayed by the LED light emitting unit 327 . At that time, in preparation for the case where the operation of the signal intensity estimation unit 75 is slow, the state in which the light was last emitted is stored, and when it becomes an object, the light is temporarily displayed (step S4).

The operator selects any one or more adjustment knobs 32 from the 16 adjustment knobs 32 of the adjustment operation unit 3, and changes the adjustment operation amount (step S5).
When the current light emission state is off, the LED light emission part 327 corresponding to the adjustment knob 32 that does not affect the sound at all is off, indicating that it does not affect the sound. 32 is targeted for estimation, the result is displayed by the LED light emitting unit 327 . At this time, in preparation for the case where the operation of the signal intensity estimating section 75 is slow, the previous adjustment state of the adjustment knob 32 is memorized, and when it becomes an object, it is provisionally displayed by light emission (step S6).

The test keynote output unit 751 outputs the test keynote TNOTE from the sound signal generation unit OP1' to the sound signal generation unit OP6' (step S7).
The acoustic signal generators OP1' to OP6' internally simulate a state in which one of the adjustment knobs 32 is operated to a predetermined position based on the adjustment operation amount set for each. Then, an acoustic signal is generated (step S8).
The synthesized sound signal detection unit 752 detects a synthesized sound signal obtained by adding or multiplying the sound signals generated by the sound signal generation units OP1′ to OP6′ using the adder 74 (step S9).

The limit amount determination unit 754 determines whether or not the adjustment operation amount has reached the limit amount based on whether or not the detected synthetic sound signal is broken (step S10).
If the limit amount has not been reached, the control signal output unit 761 outputs a control signal that causes the LED light emitting unit 327 to emit green light (step S11), thereby informing the operator that the adjustment operation amount can still be increased. inform.
If the limit amount is exceeded, the control signal output unit 761 outputs a control signal that causes the LED light emitting unit 327 to emit red light (step S12), thereby restraining the operator from further increasing the adjustment operation amount.

The limit amount determination unit 754 determines whether or not it has been determined whether or not the limit amount has been reached for all the adjustment knobs 32 that are subject to estimation (step S13). If it has not been determined whether or not all the adjustment knobs 32 subject to estimation have reached the limit amount, the process returns to step S8, and steps S9 and subsequent steps are repeated.
If it has been determined whether or not all of the adjustment knobs 32 subject to estimation have reached the limit amount, the limit amount determination unit 754 ends the process, returns to step S5, and repeats step S6 and the subsequent steps.

According to this embodiment, the following effects are obtained.
In the present embodiment, the signal strength estimator 75 acquires the signal strength according to the frequency of the synthesized sound signal generated by the FM synthesizer 1 before the operator operates it, and the tone color of the synthesized sound signal collapses. It is determined whether there is When the timbre of the synthesized sound signal breaks down and exceeds the limit amount, the limit amount notification unit 76 changes the light emission color of the LED light emitting unit 327 of the adjustment knob 32 of the adjustment operation unit 3 to notify the operator. visually recognized.

Therefore, the operator who operates the adjustment knob 32 can recognize how far the adjustment knob 32 should be adjusted to generate a new synthesized sound signal without destroying the timbre of the synthesized sound signal. Therefore, it is possible to generate a new synthetic sound signal with a musical scale, using the light emission state of the adjustment knob 32 as a guide for navigation.
Especially when the modulated wave has multiple inputs as in the present embodiment, the input/output system is complicated and the synthetic acoustic signal to be generated cannot be predicted. .

In this embodiment, the LED light emitting portion 327 of the adjustment knob 32 is notified whether or not the limit amount has been exceeded with different colored lights. Therefore, the operator can easily recognize whether or not the limit amount has been exceeded during adjustment of the adjustment knob 32, determine which adjustment knob is adjustable, and easily generate a new synthesized sound signal. can be improved.
In this embodiment, when the FM synthesizer 1 is activated, the limit amount notification unit 76 displays the notification state at the time of the previous adjustment operation. Therefore, since the operator can easily grasp the adjustment knob 32 that has not exceeded the limit amount in the previous adjustment operation, it is possible to generate a new synthetic sound signal more easily.

In addition, the specific structure, shape, and the like in carrying out the present invention include the following modifications.
In the above embodiment, the audio signal generators OP1 to OP6 and the audio signal generators OP1' to OP6' are DSPs, but the present invention is not limited to this. For example, it may be configured as a computer-readable sound signal generating program to be executed on an arithmetic processing unit of a computer.

In the above-described embodiment, the limit amount notification unit 76 notifies the operator that the adjustment operation amount exceeds the limit amount by changing the color of light emitted from the LED light emitting unit 327 of the adjustment knob 32. The present invention is not limited to this. For example, the LED light emitting unit 327 may be blinked to notify the operator by changing the blinking interval, or a message may be displayed on the display device of the computer or the like.
In addition, the structure, shape, and the like in carrying out the present invention may be other structures and the like as long as the object of the present invention can be achieved.

DESCRIPTION OF SYMBOLS 1... FM synthesizer 2... Synthesizer main body 3... Adjustment operation unit 4... MIDI keyboard 5... Parameter selection part 6... FM synthesizer part for sound output 7... FM synthesizer part for analysis 8... Noise component analysis part , 9 noise reduction section 31 case 32 adjustment knob 61 oscillator 62 amplifier 63 signal output section 63A output side amplifier 64 modulated wave input section 64A input side amplifier 64B Input side adder 65 Acoustic signal synthesizing unit 66 First adder 67 Filter unit 68 Second adder 69 Switch 70 Amplifier 71 Oscillator 72 Signal output unit 72A... Output side amplifier, 73... Modulation signal input unit, 73A... Input side amplifier, 73B... Input side adder, 74... Adder, 75... Signal strength estimation unit, 76... Limit amount notification unit, 327... LED light emission unit , 751... test keynote output section, 752... synthesized sound signal detection section, 753... operation amount change section, 754... limit amount determination section, 755... selection section, 761... control signal output section, 762... notification state storage section , KNOTE... Keynote OP1... Acoustic signal generator OP2... Acoustic signal generator OP3... Acoustic signal generator OP4... Acoustic signal generator OP5... Acoustic signal generator OP6... Acoustic signal generator OP1' ... acoustic signal generator OP2'... acoustic signal generator OP3'... acoustic signal generator OP4'... acoustic signal generator OP5'... acoustic signal generator OP6'... acoustic signal generator PO1... output intensity Pattern, PO2... Output intensity pattern, PO3... Output intensity pattern, PO4... Output intensity pattern, PT1... Pattern, PT2... Pattern, PT3... Pattern, PT4... Pattern, TNOTE... Key note for testing, W1... Sine wave, W2... Triangular wave, W3...sawtooth wave, W4...square wave, f_in'...frequency.

Claims (6)

a plurality of acoustic signal generators for generating acoustic signals by modulating a carrier wave generated by an oscillator with an input modulated wave;
a plurality of adjustment operation units that prompt an operator to make adjustments and adjust the feature amounts of the acoustic signals generated by the plurality of acoustic signal generation units;
an acoustic signal synthesizing unit that generates a synthetic acoustic signal synthesized by adding or multiplying the acoustic signals generated by the respective acoustic signal generating units;
a signal strength estimating unit for estimating the signal strength of the synthesized sound signal to be output from the adjustment states of the plurality of adjustment operating units ;
Based on the estimated signal strength of the synthesized sound signal , at least a difference between whether the adjustment operation amount by the adjustment operation unit has reached the limit amount and the adjustment operation amount by the adjustment operation unit and the limit amount . One of them is a limit amount notification unit that notifies the operator,
Acoustic device with. The acoustic device according to claim 1,
A plurality of the limit amount notification units are provided corresponding to each of the plurality of adjustment operation units, and indicate whether or not the adjustment operation amount in each of the plurality of adjustment operation units has reached the limit amount. An acoustic device that notifies the operator of at least one of the adjustment operation amount and the limit amount in each of the operation units. In the acoustic device according to claim 1 or claim 2 ,
The acoustic device, wherein the acoustic signal generator inputs the generated acoustic signal as a modulated wave to at least one of the self and other acoustic signal generators. In the acoustic device according to any one of claims 1 to 3 ,
The limit amount notification unit includes a light-emitting unit, and provides notification by causing the light-emitting unit to emit light in a different light emission state or color depending on the estimated signal strength of the synthesized sound signal. In the acoustic device according to any one of claims 1 to 4 ,
The limit amount notification unit is an audio device that notifies the notification state at the time of the previous adjustment operation during the estimation by the signal strength estimation unit. A computer-readable sound signal generating program that causes a computer to function as the sound device according to any one of claims 1 to 5 .

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