JPWO2020049659A1 - Acoustic device and acoustic signal generation program - Google Patents

Abstract

The acoustic device is adjusted by an operator with a plurality of acoustic signal generators (OP1'-OP6') that modulate the carrier generated by the oscillator (71) with the input modulated wave to generate an acoustic signal. A plurality of feature amount adjusting units having an adjusting operation unit (32) for prompting and adjusting the feature amount of the acoustic signal generated by each acoustic signal generation unit (OP1'-OP6'), and each acoustic signal generation unit. Output from the adjustment state of the acoustic signal synthesizer (74) that adds or multiplies the acoustic signal generated by (OP1'-OP6') to generate a composite acoustic signal, and a plurality of feature amount adjustment units. A signal strength estimation unit (75) for estimating the signal strength of the composite acoustic signal to be generated, and an adjustment operation unit (32) provided according to a plurality of feature amount adjustment units and based on the estimated signal strength of the synthetic acoustic signal. ) Is provided with a limit amount notification unit (76) for notifying the operator of the limit amount of the adjustment operation amount.

Description

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

Conventionally, an acoustic device such as an FM synthesizer is known as an electronic musical instrument (see, for example, Patent Document 1).
The FM synthesizer modulates the carrier wave oscillated from the first oscillator with the modulated wave oscillated from the second oscillator to generate various acoustic signals. Then, by generating an acoustic signal having a frequency corresponding to the key note input by an electronic keyboard or the like connected to the FM synthesizer, it is possible to output a sound with a scale.
According to the FM synthesizer, various acoustic signals can be generated by combining a carrier wave and a modulated wave, so that an acoustic signal close to the tone of a normal musical instrument can be generated, or an acoustic signal with a new tone that has never existed before can be generated. There is an effect.

Japanese Unexamined Patent Publication No. 4-161994

By the way, in recent FM synthesizers, a plurality of combinations of the two oscillators described above are used, the acoustic signals output from each are added or multiplied, and the acoustic signal generated by the self is looped as an input of the self to create a new acoustic. A signal is being generated.
In this case, conventionally, a plurality of combinations have been limited, and the waveform, frequency, amplification factor, etc. of each oscillator have been adjusted by a preset combination method.

However, the preset combination method has a problem that the selection range of acoustic signals of new tones that can be generated is limited.
On the other hand, even if the degree of freedom of combination of oscillators is improved and the adjustment amount of each oscillator can be freely set, it is difficult for the operator to understand which parameter should be adjusted to affect the acoustic signal. .. Therefore, there is a problem that it is very difficult to adjust and set each oscillator.
Further, there is a problem that the scale of the generated acoustic signal may be disrupted and may not function as a musical instrument depending on the combination of the parameter adjustment and setting of the oscillator.

An object of the present invention is to provide an acoustic device and an acoustic signal generation program capable of freely generating a new acoustic signal and outputting an acoustic signal having a scale without breaking down as a musical instrument. be.

The acoustic device of the present invention has a plurality of acoustic signal generators that modulate a carrier generated by an oscillator by an input modulated wave to generate an acoustic signal, and an adjustment operation unit that encourages adjustment by an operator. , A composition synthesized by adding or multiplying a plurality of feature amount adjusting units for adjusting the feature amounts of the acoustic signals generated by each acoustic signal generation unit and the acoustic signals generated by the respective acoustic signal generation units. Depending on the acoustic signal synthesizer that generates the acoustic signal, the signal strength estimation unit that estimates the signal strength of the composite acoustic signal to be output from the adjusted states of the plurality of feature amount adjustment units, and the feature amount adjustment unit. It is provided with a limit amount notification unit that notifies the operator of the limit amount of the adjustment operation amount by the adjustment operation unit based on the signal strength of the estimated synthetic acoustic signal.
The computer-readable acoustic signal generation program of the present invention causes the computer to function as the above-mentioned acoustic device.

The block diagram which shows the audio apparatus which concerns on embodiment of this invention. The block diagram which shows the structure of the acoustic signal generation part and the acoustic signal synthesis part in the said Embodiment. The graph which shows the signal intensity of the acoustic signal generated according to the waveform of the modulated wave in the said embodiment. The graph which shows the signal strength of the synthetic acoustic signal in the said embodiment. FIG. 3 is a block diagram showing an acoustic signal generation unit, an acoustic signal synthesis unit, a signal strength estimation unit, and a limit amount notification unit in the embodiment. The block diagram which shows the signal strength estimation part and the limit amount notification part in the said embodiment. The flowchart for demonstrating the operation in the said Embodiment.

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

The adjustment operation unit 3 includes a box-shaped case 31 and a plurality of adjustment knobs 32. In the present embodiment, 4 × 4 = 16 adjustment knobs 32 as adjustment operation units are provided from the adjustable acoustic signal generation unit OP1 of the synthesizer main body 2 according to the acoustic signal generation unit OP4.
In the present embodiment, the adjustment operation unit 3 is configured as hardware, but the present invention is not limited to this. For example, it may be a feature amount adjusting 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 unit 5, an FM synthesizer unit 6 for sound output, an FM synthesizer unit 7 for analysis, a noise component analysis unit 8, and a noise reduction unit 9.
The parameter selection unit 5 is a part that selects the waveform of the acoustic signal generated and output by the synthesizer main body 2, and examples of the selectable waveforms include a sine wave W1, a triangular wave W2, a sawtooth wave W3, and a square wave W4. Yes (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 determined by the FM synthesizer unit 6 for sound output and the FM synthesizer unit 7 for analysis. It is output.

As shown in FIG. 2, the sound output FM synthesizer unit 6 is composed of a DSP (Digital Signal Processor), and includes a plurality of acoustic signal generation units OP1 to acoustic signal generation units OP6.
Of these, the acoustic signal generation unit OP1 to the acoustic signal generation unit OP4 generate an acoustic signal to be output based on the carrier wave and the modulated wave used by the sound output FM synthesizer unit 6. In this embodiment, an acoustic signal generation unit OP5 and an acoustic signal generation unit OP6 are separately provided. The acoustic signal generation unit OP5 and the acoustic signal generation unit OP6 are modulated by a combination of existing preset type oscillators, and are provided in advance.
The acoustic signal generation unit OP1 includes an oscillator 61, an amplifier 62, a signal output unit 63, an output side amplifier 63A, and a modulated wave input unit 64. The acoustic signal generation unit OP2 to the acoustic signal generation unit 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 unit 5, and modulates the carrier wave with the input modulated wave. Specifically, the oscillator 61 generates a carrier wave having a frequency corresponding to the keynote KNOTE input from the MIDI keyboard 4, and modulates it with a modulated wave.
For example, as shown in FIG. 3, when the modulated wave is a sine wave W1, the oscillator 61 has a frequency set by the adjustment knob 32 of the adjustment operation unit 3 with respect to the carrier wave of the frequency input as the keynote KNOTE. Modulate with the sine wave W1 of the ratio. The signal strength of the acoustic signal output after the modulation is similar to the pattern PT1 having the frequency f_in'peaking according to the keynote KNOTE.

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

The amplifier 62 amplifies the acoustic signal output from the oscillator 61. The amplification factor is set according to the output of the EG (envelope generator) and the keystroke strength of the MIDI keyboard 4 included in the keynote KNOTE.
The signal output unit 63 outputs the acoustic signal generated by the oscillator 61 to the acoustic signal synthesis unit 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 unit 64 of OP4.

Similarly, the acoustic signals output from the respective signal output units 63 of the acoustic signal generation unit OP2, the acoustic signal generation unit OP3, and the acoustic signal generation unit OP4 are also fed back to the own modulated wave input unit 64, and other It is output to the modulated wave input unit 64 of the acoustic signal generation unit.
The modulated wave input unit 64 includes a plurality of input side amplifiers 64A and an input side adder 64B.
A plurality of input side amplifiers 64A are provided according to the input acoustic signal, and if it is the acoustic signal generation unit OP1, the feedback acoustic signal output by itself and the acoustic signal generation unit from another acoustic signal generation unit OP2 are provided. Amplifies the input acoustic signal generated by 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 them to the oscillator 61 as a modulated wave.

In the present embodiment, since the four acoustic signal generation units OP1 to the acoustic signal generation unit OP4 are provided, the acoustic signal amplified by the four input side amplifiers 64A provided in front of each of the four oscillators 61. The intensity of is adjusted to output the final acoustic signal. That is, in the present embodiment, 16 adjustment points can be made, which corresponds 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 acoustic signal generation unit OP1 to the acoustic signal generation unit OP4 having multiple inputs and one output, it is possible to generate an acoustic signal having a wide variety of tones. However, on the other hand, it is not possible to predict how to operate the adjustment operation unit 3 to generate an acoustic signal of a desired tone color, and the synthesizer is extremely difficult for the operator to perform the adjustment operation.

The signal output unit 63 outputs the acoustic signal generated by the acoustic signal generation unit OP6 from the acoustic signal generation unit OP1.
The output side amplifier 63A amplifies the acoustic signal generated by the acoustic signal generation unit OP6 from the acoustic signal generation unit OP1 at 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 synthesis unit 65 adds or multiplies the acoustic signals output from each of the acoustic signal generation units OP1 to the acoustic signal generation unit OP4, and outputs the sound signals of the FM synthesizer 1. The acoustic signal synthesis unit 65 includes a first adder 66, a filter unit 67, a second adder 68, and an amplifier 70.
The first adder 66 adds the acoustic signals output from each of the acoustic signal generation units OP1 to the acoustic signal generation unit OP4 to generate a synthetic acoustic signal for voice output. The outputs of the preliminary acoustic signal generation unit OP5 and the acoustic signal generation unit OP6 are also added to the first adder 66.

The filter unit 67 performs a filter process on the synthetic acoustic signal added by the first adder 66. The filter of the filter unit 67 is set to a desired filter characteristic in order to process an acoustic signal having a desired timbre.
In the second adder 68, the output from the auxiliary acoustic signal generation unit OP5 is added without passing through the filter unit 67, and whether or not to filter the output of the acoustic signal generation unit OP5 is determined by the switch in the previous stage. It is done by switching 69.
The amplifier 70 amplifies the synthetic acoustic signal to be output. The amplified synthetic acoustic signal is output as voice by a speaker or the like.

The output synthetic acoustic signal varies depending on the waveform and frequency ratio of the oscillator 61 of the acoustic signal generation unit OP1 to the acoustic signal generation unit OP1, the amplification factor of the output side amplifier 63A, and the amplification factor of the input side amplifier 64A. For example, as the synthetic acoustic signal, a synthetic acoustic signal having a different frequency is output with respect to the frequency f_in'corresponding to the input keynote KNOTE. For example, as shown in FIG. 4, in the case of modulation with the 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 higher. Therefore, it will be attenuated. Therefore, the listener can identify the scale of the output synthetic acoustic signal.

However, like the output intensity pattern PO4 modulated by the triangular wave W2 to the output intensity pattern PO4 modulated by the square wave W4, the signal intensity of the frequency f_in'corresponding to the keynote KNOTE is gradually buried in the signal intensity of other frequencies. Therefore, it is not possible to output the pitch according to the keynote KNOTE. That is, no matter which key of the MIDI keyboard 4 is pressed by the operator, only high-frequency noise sound is output, and the instrument breaks down.
Therefore, the FM synthesizer 1 of the present embodiment has a navigation function that can be operated so that the output synthetic acoustic signal is only a high-frequency noise sound and does not break down as a musical instrument.

As shown in FIG. 5, the analysis FM synthesizer unit 7 includes a plurality of acoustic signal generation units OP1'to sound signal generation unit OP6' and an output side amplifier, which are composed of a DSP in the same manner as the sound output FM synthesizer unit 6. It includes 72A, an adder 74, a signal strength estimation unit 75, and a limit amount notification unit 76.
Each of the acoustic signal generation unit OP1'to the acoustic signal generation unit OP6' includes an oscillator 71, a signal output unit 72, and a modulation signal input unit 73. The modulation signal input unit 73 includes an input side amplifier 73A and an input side adder 73B.

These configurations are the same as those from the acoustic signal generation unit OP1 to the acoustic signal generation unit OP6 of the sound output FM synthesizer unit 6. A test keynote TNOTE generated in the synthesizer main body 2 is input to each oscillator 71, and the oscillator 71 adjusts a carrier wave according to the frequency of the test keynote TNOTE by adjusting a plurality of adjustment knobs 32. It is modulated by the modulated wave generated according to the state.
The adder 74 adds or multiplies the acoustic signals generated by each of the acoustic signal generation units OP1'to the acoustic signal generation unit OP6', and outputs the composite acoustic signal to the signal intensity estimation unit 75.

The signal strength estimation unit 75 and the limit amount notification unit 76 are configured as a program executed on a computer arithmetic processing unit (not shown) or a storage area reserved on the storage device.
As shown in FIG. 6, the signal strength estimation unit 75 includes a test keynote output unit 751, a synthetic acoustic signal detection unit 752, an operation amount change unit 753, a limit amount determination unit 754, and an adjustment knob selection unit 755. Further, the signal strength estimation unit 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 the limit amount determination by the limit amount determination unit 754 described later. NS.

The test keynote output unit 751 outputs a test keynote TNOTE from the acoustic signal generation unit OP1'to the acoustic signal generation unit OP6'. The acoustic signal generation unit OP1'to the acoustic signal generation unit OP6' generate an acoustic signal 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 the acoustic signal generation unit OP6'from the acoustic signal generation unit OP1'. Specifically, the adjustment knob selection unit 755 is input to the oscillator 71 to be adjusted, the modulated waveform of the oscillator 71, the intensity of the output acoustic signal, the frequency ratio, and the oscillator 71 or another oscillator 71. The adjustment knob 32 for adjusting the intensity of the acoustic signal is selected. The adjustment knob selection unit 755 outputs the selected adjustment knob 32 to the limit amount determination unit 754.

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

The operation amount changing unit 753 amplifies the waveform, frequency ratio, and amplification of the modulated wave of each oscillator 71 from the acoustic signal generation unit OP1'to the acoustic signal generation unit OP6', as in the adjustment operation of the adjustment knob 32 of the adjustment operation unit 3. The rate and the adjustment operation amount of the amplification factor of the input side amplifier 73A are output. Specifically, the operation amount changing unit 753 outputs a combination of the adjustment operation amounts of all the adjustment knobs 32 as the adjustment operation amount according to the adjustment amount of each adjustment knob 32 of the adjustment operation unit 3.
Further, the operation amount changing unit 753 outputs the adjustment operation amount output from the acoustic signal generation unit OP1'to the acoustic signal generation unit OP6' to the limit amount determination unit 754.

The limit amount determination unit 754 sets the waveform and frequency ratio of the modulated wave, 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 change unit 753. It is determined whether or not the synthetic acoustic signal modulated by the above is broken when the audio is output. Specifically, the limit amount determination unit 754 uses the frequency corresponding to the test keynote TNOTE as the fundamental frequency, and includes the signal strengths of the fundamental tone, its second harmonic overtone, and the third harmonic overtone, and others included in the synthetic acoustic signal. From the S / N ratio with the signal strength of the frequency component of, it is determined whether or not the output synthetic acoustic signal is broken. The S / N ratio between the signal strengths of the fundamental, second and third harmonics and the signal strengths of other frequency components contained in the synthetic acoustic signal is based on the frequency corresponding to the test keynote TNOTE. If it is smaller than a predetermined threshold value, it is determined that the adjustment operation amount exceeds the limit amount and is broken.

Here, the synthetic acoustic signal generated from the acoustic signal generation unit OP1'to the acoustic signal generation unit OP6' is different from the acoustic signal generated by the same setting as the setting of the sound output FM synthesizer unit 6, and is different from the sound output FM. It is generated by the same setting as the setting of the synthesizer unit 6 and the setting when the adjustment knob 32 is further operated at one place.
At this time, the adjustment operation unit 3 is in a state of operating the four oscillators 61 and the four input side amplifiers 64A and the input side amplifiers 73A provided in front of the oscillator 71. These 16 parameters can be adjusted by the 16 adjustment operation knobs 32 of the adjustment operation unit 3.

When the operator operates one adjustment knob 32, in addition to the operation, the state in which one of the adjustment knobs 32 is operated at a predetermined position is internally simulated, and the acoustic signal generation unit OP1 The sound signal generation unit OP6'from'to generate a synthetic sound signal according to the operation position of the adjustment knob 32 in the internally simulated state.
The limit amount determination unit 754 analyzes this synthetic acoustic 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 unit 76 includes a control signal output unit 761 and a notification state storage unit 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 serves as a visual means of each 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 for causing 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, when the adjustment operation amount of the adjustment knob 32 exceeds the limit amount, the control signal output unit 761 outputs a control signal for causing the LED light emitting unit 327 to emit light in red.
The emission color of the LED light emitting unit 327 is not limited to two colors, such as green when the adjustment operation amount is sufficiently smaller than the limit amount, yellow when the adjustment operation amount is close to the limit amount, and red when the limit amount is exceeded. It may be configured to be displayed in multiple stages.

The notification state storage unit 762 is configured as a part of a storage area of a recording medium such as a 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 the new limit amount of the adjustment operation amount.

Next, the operation of the present embodiment will be described with reference to the flowchart shown in FIG.
When the FM synthesizer 1 is activated (procedure S1), the control signal output unit 761 reads the previous adjustment state from the notification state storage unit 762 (procedure S2).
The control signal output unit 761 outputs a control signal based on the previous adjustment state to the adjustment operation unit 3, and sets the LED light emitting unit 327 of the adjustment knob 32 to the adjustment state of the previous adjustment knob 32 to each of the adjustment operation units 3. Light emission is displayed accordingly.
Specifically, the LED light emitting unit 327 corresponding to the adjustment knob 32 that does not affect the sound at all is turned off, indicating that the sound is not affected, and the adjustment knob 32 is newly operated to affect the sound. In that case, it becomes an estimation target, and the result is displayed by the LED light emitting unit 327. At that time, in case the operation of the signal strength estimation unit 75 is slow, the state of the last light emission is memorized, and when the target is targeted, the light is tentatively displayed (procedure 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 (procedure S5).
When the current light emitting state is off, the LED light emitting unit 327 corresponding to the adjustment knob 32 that does not affect the sound at all is turned off to indicate that it does not affect the sound. If it becomes an estimation target when the 32 is operated, the result is displayed by the LED light emitting unit 327. At that time, the adjustment state of the previous adjustment knob 32 is memorized in case the operation of the signal strength estimation unit 75 is slow, and when the signal strength estimation unit 75 becomes a target, the light is tentatively displayed (procedure S6).

The test keynote output unit 751 outputs the test keynote TNOTE from the acoustic signal generation unit OP1'to the acoustic signal generation unit OP6' (procedure S7).
The acoustic signal generation unit OP1'to the acoustic signal generation unit OP6' internally simulate a state in which one of the adjustment knobs 32 is further operated at a predetermined position based on the adjustment operation amount set for each. (Procedure S8).
The synthetic acoustic signal detection unit 752 detects a synthetic acoustic signal obtained by adding or multiplying the acoustic signals generated by the acoustic signal generation unit OP6'from the respective acoustic signal generation units OP1' by the adder 74 (procedure 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 acoustic signal is broken (procedure S10).
When 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 (procedure S11), and informs the operator that the adjustment operation amount can still be increased. Notify.
When the limit amount is exceeded, the control signal output unit 761 outputs a control signal for causing the LED light emitting unit 327 to emit red light (procedure S12) to prevent the operator from further increasing the adjustment operation amount.

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

According to the present embodiment as described above, there are the following effects.
In the present embodiment, the signal strength according to the frequency of the synthetic acoustic signal generated by the FM synthesizer 1 is acquired by the signal strength estimation unit 75 before the operator operates, and the timbre of the synthetic acoustic signal is disrupted. Whether or not it is judged. Then, when the timbre of the synthetic acoustic signal breaks down and exceeds the limit amount, the limit amount notification unit 76 changes the emission color of the LED light emitting unit 327 of the adjustment knob 32 of the adjustment operation unit 3 to the operator. It is 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 synthetic acoustic signal without disrupting the timbre of the synthetic acoustic signal. Therefore, it is possible to generate a new synthetic acoustic signal having a scale by using the light emitting state of the adjustment knob 32 as a navigation guide.
In particular, when the modulated wave has multiple inputs as in the present embodiment, the input / output system is complicated and the generated synthetic acoustic signal cannot be predicted. Therefore, it is of great significance to adopt the present invention. ..

In the present embodiment, the LED light emitting unit 327 of the adjustment knob 32 is notified whether or not the limit amount is exceeded by different colored lights. Therefore, the operator can easily recognize whether or not the limit amount has been exceeded during the adjustment of the adjustment knob 32, determine which adjustment knob is adjustable, and easily generate a new synthetic acoustic signal. Can be achieved.
In the present embodiment, the limit amount notification unit 76 displays the notification state at the time of starting the FM synthesizer 1 and at the time of the previous adjustment operation. Therefore, since the operator can easily grasp the adjustment knob 32 that does not exceed the limit amount in the previous adjustment operation, it is possible to more easily generate a new synthetic acoustic signal.

The specific structure, shape, etc. at the time of carrying out the present invention also include the following modifications.
In the above embodiment, the acoustic signal generation unit OP1 to the acoustic signal generation unit OP6 and the acoustic signal generation unit OP1'to the acoustic signal generation unit OP6'are composed of a DSP, but the present invention is not limited to this. For example, it may be configured as a computer-readable acoustic signal generation program to be executed on a computer arithmetic processing unit.

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 emission color of 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 change the blinking interval to notify the operator, or a display device of a computer or the like may be used to display a message.
In addition, the structure, shape, and the like at the time of carrying out the present invention may be other structures and the like as long as the object of the present invention can be achieved.

1 ... FM synthesizer, 2 ... Synthesizer body, 3 ... Adjustment operation unit, 4 ... Modulation keyboard, 5 ... Parameter selection unit, 6 ... FM synthesizer unit for sound output, 7 ... FM synthesizer unit for analysis, 8 ... Noise component analysis unit , 9 ... Noise reduction unit, 31 ... Case, 32 ... Adjustment knob, 61 ... Oscillator, 62 ... Amplifier, 63 ... Signal output unit, 63A ... Output side amplifier, 64 ... Modulated wave input unit, 64A ... Input side amplifier, 64B ... Input side adder, 65 ... Acoustic signal synthesizer, 66 ... First adder, 67 ... Filter part, 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 emitting unit , 751 ... Test keynote output unit, 752 ... Synthetic acoustic signal detection unit, 753 ... Operation amount change unit, 754 ... Limit amount determination unit, 755 ... Selection unit, 761 ... Control signal output unit, 762 ... Notification state storage unit , KNOTE ... key note, 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 generation unit, OP2'... acoustic signal generation unit, OP3'... acoustic signal generation unit, OP4'... acoustic signal generation unit, OP5'... acoustic signal generation unit, OP6'... acoustic signal generation unit, PO1 ... output strength Pattern, PO2 ... Output intensity pattern, PO3 ... Output intensity pattern, PO4 ... Output intensity pattern, PT1 ... Pattern, PT2 ... Pattern, PT3 ... Pattern, PT4 ... Pattern, TNOTE ... Test keynote, W1 ... Sine wave, W2 ... Triangular wave, W3 ... saw wave, W4 ... rectangular wave, f_in'... frequency.

Claims (5)

A plurality of acoustic signal generators that modulate the carrier wave generated by the oscillator by the input modulated wave to generate an acoustic signal, and
It has an adjustment operation unit that encourages adjustment by the operator, and has a plurality of feature amount adjustment units that adjust the feature amount of the acoustic signal generated by each acoustic signal generation unit.
An acoustic signal synthesizer that adds or multiplies the acoustic signals generated by each acoustic signal generator to generate a composite acoustic signal, and an acoustic signal synthesizer.
A signal strength estimation unit that estimates the signal strength of the output synthetic acoustic signal from the adjustment states of the plurality of feature amount adjustment units, and a signal strength estimation unit.
A limit amount notification unit that is provided according to the plurality of feature amount adjustment units and notifies the operator of the limit amount of the adjustment operation amount by the adjustment operation unit based on the estimated signal strength of the synthetic acoustic signal.
An audio device equipped with. In the audio device according to claim 1,
The acoustic signal generation unit is an acoustic device that inputs the generated acoustic signal as a modulated wave of at least one of the self and other acoustic signal generation units. In the audio device according to claim 1 or 2.
The limit amount notification unit is an acoustic device that notifies by different visual means according to the estimated feature amount of the synthetic acoustic signal. In the audio device according to any one of claims 1 to 3.
The limit amount notification unit is an acoustic device that notifies the notification state at the time of the previous adjustment operation during estimation by the signal strength estimation unit. A computer-readable acoustic signal generation program that causes a computer to function as the acoustic device according to any one of claims 1 to 4.

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