WO2020059085A1 - Musical performance device and noise reducing program - Google Patents

Musical performance device and noise reducing program Download PDF

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Publication number
WO2020059085A1
WO2020059085A1 PCT/JP2018/034855 JP2018034855W WO2020059085A1 WO 2020059085 A1 WO2020059085 A1 WO 2020059085A1 JP 2018034855 W JP2018034855 W JP 2018034855W WO 2020059085 A1 WO2020059085 A1 WO 2020059085A1
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WIPO (PCT)
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unit
signal
frequency
output
noise
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PCT/JP2018/034855
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French (fr)
Japanese (ja)
Inventor
四郎 鈴木
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ＡｌｐｈａＴｈｅｔａ株式会社
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Priority to PCT/JP2018/034855 priority Critical patent/WO2020059085A1/en
Priority to JP2020547550A priority patent/JP7189960B2/en
Publication of WO2020059085A1 publication Critical patent/WO2020059085A1/en

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H7/00—Instruments in which the tones are synthesised from a data store, e.g. computer organs
    • G10H7/08—Instruments in which the tones are synthesised from a data store, e.g. computer organs by calculating functions or polynomial approximations to evaluate amplitudes at successive sample points of a tone waveform
    • G10H7/12—Instruments in which the tones are synthesised from a data store, e.g. computer organs by calculating functions or polynomial approximations to evaluate amplitudes at successive sample points of a tone waveform by means of a recursive algorithm using one or more sets of parameters stored in a memory and the calculated amplitudes of one or more preceding sample points

Definitions

  • the present invention relates to a performance device and a noise reduction program.
  • a performance device such as an FM synthesizer has been known as an electronic musical instrument (for example, see Patent Document 1).
  • the FM synthesizer modulates a carrier wave oscillated from the first oscillator with a modulated wave oscillated from the second oscillator to generate various acoustic signals. Then, an acoustic signal having a musical scale can be output based on a key note input from an electronic keyboard or the like connected to the FM synthesizer.
  • Patent Literature 2 discloses a technique for clarifying a speech component of an output audio signal by performing a filtering process on a specific frequency band from an audio signal including a speech component and a noise component.
  • Patent Document 2 can only remove a noise component whose frequency band is known to some extent, such as environmental noise.
  • the FM synthesizer since the frequencies of the carrier wave and the modulation wave can be set freely, there is a problem in that the distribution of noise components generated is not uniform and cannot be dealt with by filter processing.
  • An object of the present invention is to provide a performance apparatus and a noise reduction program capable of removing a noise irrespective of the distribution of occurrence of a noise component and outputting an acoustic signal having a frequency corresponding to an operation of an operator.
  • a performance device is a performance device that outputs an audio signal having a frequency corresponding to an operation of an operator, and a noise detecting a signal intensity of a noise signal other than the frequency of the audio signal according to the operation of the operator.
  • a signal detection unit; and a noise signal reduction unit that attenuates or eliminates the signal strength of the noise signal detected by the noise signal detection unit.
  • the noise reduction program of the present invention causes a computer to function as the above-described performance device.
  • FIG. 1 is a block diagram showing an acoustic device according to an embodiment of the present invention.
  • FIG. 4 is a plan view showing a structure of an adjustment knob according to the embodiment. Sectional drawing which shows the structure of the adjustment knob in the said embodiment.
  • FIG. 2 is a block diagram showing a structure of an audio signal generation unit and an audio signal synthesis unit according to the embodiment.
  • 5 is a graph showing the signal strength of an acoustic signal generated according to the waveform of a modulated wave in the embodiment.
  • 4 is a graph showing the signal strength of a synthetic acoustic signal according to the embodiment.
  • FIG. 3 is a block diagram showing an audio signal generation unit, an audio signal synthesis unit, a signal strength estimation unit, and a limit amount notification unit in the embodiment.
  • FIG. 1 is a block diagram showing an acoustic device according to an embodiment of the present invention.
  • FIG. 4 is a plan view showing a structure of an adjustment knob according to the embodiment. Sectional drawing which shows
  • FIG. 3 is a block diagram illustrating a signal strength estimating unit and a limit amount notifying unit according to the embodiment.
  • FIG. 2 is a block diagram showing a noise reduction unit according to the embodiment.
  • 9 is a graph showing an analysis result by the noise component analyzer in the embodiment.
  • 4 is a graph illustrating noise attenuation by a noise reduction unit according to the embodiment. 4 is a flowchart for explaining the operation in the embodiment.
  • FIG. 1 shows an FM (Frequency Modulation) synthesizer 1 according to an embodiment of the present invention.
  • the FM synthesizer 1 as a performance device includes a synthesizer main body 2 and an adjustment operation unit 3, generates an acoustic signal having a pitch corresponding to a key note output from the MIDI keyboard 4, and outputs the sound to the outside.
  • the adjustment operation unit 3 includes a plurality of adjustment knobs 32 for adjusting gains and frequency ratios of a plurality of oscillators included in the synthesizer main body 2. When the operator operates each of the adjustment knobs 32, the sound output FM synthesizer unit 6 is provided. To generate acoustic signals of different timbres.
  • the adjustment operation unit 3 includes a box-shaped case 31 and a plurality of adjustment knobs 32.
  • the adjustment knob 32 as an adjustment operation unit is rotatably provided on the upper surface of the case 31, and includes an operation knob main body 321, an adjustment position display marker 322, and a knob base 323, as shown in FIGS.
  • the operation knob main body 321 is made of an opaque material such as black rubber and is rotatably held on the case 31.
  • the adjustment position display marker 322 and the knob base 323 are made of a light guide material such as a lens material. That is, the adjustment position display marker 322 and the knob base 323 emit light from the LED light emitting unit 327, which will be described later, so as to emit light around the operation knob main body 321 or the adjustment position display marker 322 according to the emission color. Function as
  • the adjustment position display marker 322 is inserted into a notch formed in the operation knob main body 321 to allow the operator to visually recognize the adjustment amount when the operation knob main body 321 is rotated.
  • the knob base 323 is provided at the bottom of the operation knob main body 321 and is supported so as to rotate in accordance with the rotation of the operation knob main body 321.
  • the knob base 323 has a radially outer end protruding outside the operation knob main body 321.
  • a rotation shaft 324 is provided at the center of rotation of the knob base 323, and a tip of the rotation shaft 324 is connected to a rotation resistor 326 provided on the circuit board 325.
  • An LED light emitting unit 327 that emits light of a plurality of colors is provided adjacent to the rotating resistor 326.
  • the LED light emitting unit 327 as a visual means is driven by a control signal from the synthesizer main body 2 and emits red, green, and blue light alone or in combination in accordance with the control signal, thereby emitting light of various colors.
  • the adjustment knob 32, the rotating shaft 324, the rotating resistor 326, and the LED light emitting unit 327 function as a feature amount adjusting unit of the present invention.
  • the adjustment operation unit 3 is configured as hardware, but is not limited to this.
  • a feature amount adjustment unit configured as an image displayed on a screen of a computer may be used.
  • the synthesizer body 2 generates a sound signal of a scale corresponding to the input keynote KNOTE, and outputs the sound signal.
  • 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 section 5 is a section for selecting a waveform of an acoustic signal generated and output by the synthesizer body 2, and examples of selectable waveforms include a sine wave W1, a triangular wave W2, a sawtooth wave W3, and a rectangular wave W4. (See FIG. 5).
  • the selected waveform, frequency ratio, amplification factor of the input-side amplifier 64A, and amplification factor of the output-side amplifier 63A are output to the FM synthesizer unit 6 for sound output and the FM synthesizer unit 7 for analysis.
  • the FM synthesizer 6 for sound output includes a DSP (Digital Signal Processor), and includes a plurality of audio signal generation units OP1 to OP4.
  • the sound signal generation units OP1 to OP4 generate sound signals to be output based on the carrier wave and the modulated wave used in the FM synthesizer unit 6 for sound output.
  • the acoustic signal generation unit OP1 includes an oscillator 61, an amplifier 62, a signal output unit 63, an output amplifier 63A, and a modulated wave input unit 64.
  • the sound signal generation units OP2 to OP4 have the same configuration.
  • the oscillator 61 generates a carrier having a predetermined frequency ratio from the waveform selected by the parameter selection unit 5, and modulates the carrier with the input modulated wave. Specifically, the oscillator 61 generates a carrier having a frequency corresponding to the keynote KNOTE input from the MIDI keyboard 4, and modulates the carrier with a modulation wave. For example, as shown in FIG. 5, when the modulated wave is a sine wave W1, the oscillator 61 adjusts the frequency set by the adjustment knob 32 of the adjustment operation unit 3 with respect to the carrier of the frequency input as the keynote KNOTE. Modulation is performed with the ratio sine wave W1. The signal strength of the acoustic signal output after the modulation is like a pattern PT1 having a peak at a frequency f_in according to the keynote KNOTE.
  • the modulating wave is the triangular wave W2
  • the signal intensity of the output acoustic signal after the modulation is like the pattern PT2
  • the modulating wave is the sawtooth wave W3
  • the acoustic signal output after the modulation is The signal strength is as shown in a pattern PT3.
  • the modulated wave is a rectangular wave W4
  • the signal strength of the acoustic signal output after the modulation is as shown in a pattern PT4. That is, when the carrier is modulated by the modulation wave, an acoustic signal having a signal strength peak at a frequency other than the frequency f_in according to the keynote KNOTE is generated depending on the waveform of the modulation wave.
  • the amplifier 62 amplifies the acoustic signal output from the oscillator 61.
  • the amplification factor is set in accordance with the keystroke strength of the MIDI keyboard 4 included in the keynote KNOTE.
  • the signal output unit 63 outputs the audio signal generated by the oscillator 61 to the audio signal synthesis unit 65.
  • 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 units OP2, OP3, and the acoustic signal generation unit It is output to the modulated wave input unit 64 of OP4.
  • the audio signals output from the respective signal output units 63 of the audio signal generation unit OP2, the audio signal generation unit OP3, and the audio signal generation unit OP4 are also fed back to the own modulation wave input unit 64, and other signals are output.
  • the signal is output to the modulated wave input unit 64 of the acoustic signal generation unit.
  • the modulation wave input section 64 includes a plurality of input-side amplifiers 64A and an input-side adder 64B. A plurality of input-side amplifiers 64A are provided in accordance with the input audio signal. If the input-side amplifier 64A is the audio signal generation unit OP1, the input-side amplifier 64A outputs the feedback-output audio signal and the audio signal generation unit OP2 from the other audio signal generation unit OP2.
  • the audio signal generated and input in OP4 is amplified.
  • 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 audio signals input from the input-side amplifier 64A and outputs the result to the oscillator 61 as a modulated wave.
  • the FM synthesizer 1 since the FM synthesizer 1 includes the audio signal generation units OP1 to OP4 with multiple inputs and one output, it is possible to generate audio signals with a wide variety of timbres. On the other hand, however, it is difficult to predict how to operate the adjustment operation unit 3 to generate an audio signal of a desired timbre, and the synthesizer is extremely difficult for an operator to perform the adjustment operation.
  • the signal output unit 63 outputs the audio signal generated by the audio signal generation unit OP4 from the audio signal generation unit OP1.
  • the output-side amplifier 63A amplifies the audio signal generated by the audio signal generation unit OP1 to the audio signal generation unit OP4 at a predetermined amplification factor.
  • the amplification factor can be adjusted by adjusting the adjustment knob 32 of the adjustment operation unit 3.
  • the sound signal synthesis unit 65 adds or multiplies the sound signals output from the sound signal generation unit OP1 to the sound signal generation unit OP4, and outputs the result as the sound signal of the FM synthesizer 1.
  • the sound signal synthesizing unit 65 includes an adder 66, a filter unit 67, and an amplifier 70.
  • the adder 66 adds the audio signals output from each of the audio signal generation units OP1 to OP4 to generate a synthesized audio signal for audio output.
  • the filter unit 67 performs a filtering process on the synthesized acoustic signal added by the first adder 66.
  • the filter of the filter section 67 is set to have a desired filter characteristic in order to process the sound signal into a desired sound color.
  • the amplifier 70 amplifies the output synthetic acoustic signal.
  • the amplified synthesized sound signal is output as a sound by a speaker or the like.
  • the output synthetic audio signal varies depending on the waveform of the oscillator 61 of the audio signal generation unit OP1 to the audio signal generation unit OP4, the frequency ratio, the amplification factor of the output amplifier 63A, and the amplification factor of the input amplifier 64A.
  • a synthesized sound signal having a different frequency from the frequency f_in corresponding to the input keynote KNOTE is output.
  • the frequency f_in takes the maximum value as in the output intensity pattern PO1, and the signal intensity of the frequency increases as the frequency increases. Decays. Therefore, the listener can identify the scale of the output synthesized acoustic signal.
  • the FM synthesizer 1 of the present embodiment has a navigation function that can be operated so that the output synthetic audio signal is only a high-frequency noise sound and does not break down as a musical instrument.
  • the analysis FM synthesizer unit 7 includes a plurality of sound signal generation units OP1 ′ to OP4 ′ each including a DSP and an output-side amplifier, similarly to the sound output FM synthesizer unit 6. 72A, an adder 74, a signal strength estimating unit 75, and a limit amount notifying unit 76.
  • Each of the acoustic signal generation units OP1 ′ to OP4 ′ includes an oscillator 71, a signal output unit 72, and a carrier signal input unit 73.
  • the carrier signal input unit 73 includes an input-side amplifier 73A and an input-side adder 73B.
  • each of the oscillators 71 receives a test keynote TNOTE generated in the synthesizer body 2, and the oscillator 71 adjusts a carrier corresponding to the frequency of the test keynote TNOTE by adjusting a plurality of adjustment knobs 32. Modulation is performed by the modulation wave generated according to the state.
  • the adder 74 adds or multiplies the sound signals generated by the sound signal generation units OP1 ′ to OP4 ′, and outputs the result to the signal strength estimation unit 75 as a synthesized sound signal.
  • the signal strength estimating unit 75 and the limit amount notifying unit 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 estimating section 75 includes a test key note output section 751, a synthetic sound signal detecting section 752, an operation amount changing section 753, a limit amount determining section 754, and an adjustment knob selecting section 755. Further, the number of each adjustment knob 32 of the adjustment operation unit 3 and the adjustment operation amount of the adjustment knob 32 are output to the signal strength estimating unit 75, and are used for limit amount determination by a limit amount determination unit 754 described later. You.
  • the test key note output unit 751 outputs the test key note TNOTE from the audio signal generation unit OP1 'to the audio signal generation unit OP4'.
  • the sound signal generation units OP1 'to OP4' generate sound signals based on the test keynote TNOTE. Further, the test key note output unit 751 outputs a frequency corresponding to the output test key note 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 audio signal generation units OP1 'to OP4'. Specifically, the adjustment knob selection unit 755 inputs the oscillator 71 to be adjusted, the modulation waveform of the oscillator 71, the intensity and frequency ratio of the output acoustic signal, and the oscillator 71 or another oscillator 71. An adjustment knob 32 for adjusting the intensity of the sound signal is selected. The adjustment knob selection unit 755 outputs the selected adjustment knob 32 to the limit amount determination unit 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 unit OP4 ′ and the sound signal generation unit OP4 ′ added by the adder 74.
  • the synthesized acoustic signal detection unit 752 converts the detected synthesized audio signal into a signal intensity corresponding to a frequency by FFT (Fast Fourier Transform) or the like, acquires a distribution of the signal intensity, and outputs the distribution to the limit amount determination unit 754. .
  • FFT Fast Fourier Transform
  • the operation amount changing unit 753 causes the audio signal generation unit OP1 'to send the audio signal generation unit OP4' the waveform, frequency ratio, and amplification of the modulated wave of each oscillator 71. It outputs the rate and the amount of adjustment operation of the amplification factor of the input side amplifier 73A. 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 amounts according to the adjustment amounts of the respective adjustment knobs 32 of the adjustment operation unit 3. Further, the operation amount changing unit 753 outputs the adjustment operation amount output from the audio signal generation unit OP1 ′ to the audio signal generation unit OP4 ′ to the limit amount determination unit 754.
  • the limit amount determination unit 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 unit 753. It is determined whether or not the synthesized acoustic signal modulated according to the above is broken when sound is output. Specifically, the limit amount determination unit 754 uses the frequency according to the test keynote TNOTE as the fundamental frequency, and sets the signal intensity of the fundamental tone, the second overtone, and the third overtone, and other signals included in the synthesized acoustic signal.
  • the S / N ratio with the signal strength of the frequency component it is determined whether or not the output synthesized acoustic signal is broken.
  • the frequency according to the test keynote TNOTE is used as the basic frequency
  • the S / N ratio between the signal strength of the fundamental tone and the overtone and the signal strength of the other frequency components included in the synthesized sound signal is smaller than a predetermined threshold. In this case, it is determined that the adjustment operation amount exceeds the limit amount and the bank is broken.
  • the synthesized sound signals generated by the sound signal generation units OP1 ′ to OP4 ′ are different from the sound signals generated by the same settings as those of the sound synthesis FM synthesizer unit 6, and are different from the sound signals generated by the sound generation FM synthesizer unit 6.
  • the same setting as that of the synthesizer unit 6 is generated by further setting when the adjustment knob 32 is operated by one position.
  • the adjustment operation unit 3 is in a state of operating the four input-side amplifiers 64A and 73A provided before the four oscillators 61 and 71.
  • the sound signal generation unit OP1 When the operator operates one adjustment knob 32, in addition to the operation, when one of the adjustment knobs 32 is operated to a predetermined position, the sound signal generation unit OP1 'switches the sound signal generation unit OP4 ′ generates a synthetic sound signal corresponding to the operation position of the adjustment knob 32.
  • the limit amount determination unit 754 analyzes the synthesized 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 outputs the lighting control signal to the LED light emitting unit 327 of each adjustment knob 32 of the adjustment operation unit 3. Output. Specifically, when the adjustment operation amount of the adjustment knob 32 is equal to or less than the limit amount, the control signal output unit 761 outputs a control signal for causing the LED light emitting unit 327 to emit green light.
  • the control signal output unit 761 outputs a control signal for causing the LED light emitting unit 327 to emit red light when the adjustment operation amount of the adjustment knob 32 exceeds the limit amount.
  • 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 operation amount is close to the limit amount, and red when the operation amount exceeds the limit amount. You may comprise so that it may display on 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.
  • the limit amount determination unit 754 rewrites the previous limit amount to a new limit amount of the adjustment operation amount.
  • the noise component analysis unit 8 analyzes a noise component included in the synthesized audio signal based on the synthesized audio signal output from the analysis FM synthesizer unit 7. As shown in FIG. 9, the noise component analysis unit 8 includes a test key note acquisition unit 81, a noise signal detection unit 82, a noise component storage unit 83, and a different scale setting unit 84.
  • the test key note obtaining section 81 obtains the test key note TNOTE output from the test key note output section 751 of the signal strength estimating section 75.
  • the noise signal detection unit 82 detects a distribution of signal strength corresponding to the frequency of the synthesized audio signal detected by the synthesized audio signal detection unit 752.
  • the noise signal detection unit 82 calculates the fundamental frequency and the overtone whose fundamental frequency is the frequency corresponding to the acquired test keynote TNOTE (if the frequency ratio is set to a value other than an integer, the frequency is changed to the frequency corresponding to the test keynote TNOTE.
  • the signal strength peaks occurring at frequencies other than the fundamental tone and the overtones whose fundamental frequency is the frequency multiplied by the ratio are detected as noise components. For example, as shown in FIG.
  • the noise signal detecting unit 82 uses the frequency f_in ′ corresponding to the test keynote TNOTE as a basic frequency and sets a peak from the peak N1 of the signal intensity other than the fundamental tone, the second harmonic, and the third harmonic. N4 is detected as a noise component.
  • the noise component storage unit 83 stores the noise component detected by the noise signal detection unit 82 as a noise component corresponding to the test keynote TNOTE in a storage area such as a memory.
  • the different scale setting unit 84 sets an acoustic signal having a frequency different from the fundamental frequency acoustic signal according to the operation of the operator.
  • the signal strength peaks of different frequencies set by the different scale setting unit 84 are not regarded as noise components to be detected by the noise signal detecting unit 82 described above, and are based on the frequency f_in ′ according to the test keynote TNOTE. It is treated in the same manner as the fundamental tone and the overtone as the frequency (in the case of setting a frequency ratio other than an integer, the fundamental tone and the overtone whose fundamental frequency is the frequency obtained by multiplying the frequency ratio by the frequency fin corresponding to the test keynote TNOTE).
  • the code “C” is set as a different scale by the different scale setting unit 84, similarly, when the operator taps “D” on the MIDI keyboard 4, “Mi” and “G” are similarly changed.
  • the noise signal is no longer regarded as a noise component, and is excluded from detection targets of the noise signal detection unit 82.
  • the output acoustic signal can be a chord, so that the chord can be played with good touch.
  • the noise reduction unit 9 attenuates or eliminates a noise component included in the synthetic sound signal output from the FM synthesizer unit 6 for outputting sound, and sets a frequency corresponding to the keynote KNOTE input from the MIDI keyboard 4 to a fundamental frequency.
  • a synthesized sound signal of a fundamental tone and an overtone (in the case of setting a frequency ratio other than an integer, a fundamental tone and an overtone whose fundamental frequency is a frequency obtained by multiplying the frequency according to the test keynote TNOTE by the frequency ratio) is output.
  • the noise reduction unit 9 includes an input key note determination unit 91 and a noise signal reduction unit 92.
  • the input key note determination unit 91 determines the key note KNOTE input by the operator operating the MIDI keyboard 4, compares the key note KNOTE with the test key note stored in the noise component storage unit 83, and determines the key note KNOTE as the test key note. With the corresponding frequency as a basic frequency, noise components of signal strengths other than the fundamental tone, the second overtone, and the third overtone from peak N1 to peak N4 are read. The input key note determination section 91 outputs the read noise component to the noise signal reduction section 92.
  • the noise signal reduction unit 92 attenuates or eliminates a noise component from the synthetic sound signal generated by the sound synthesizer unit 6. Specifically, as shown in FIG. 11, the signal intensity peaks N1 to N4 in the noise band corresponding to the keynote KNOTE collated by the input keynote determination unit 91 are attenuated. To attenuate the peak of the signal strength in the noise band, for example, filter processing by a notch filter can be adopted.
  • the operation amount changing unit 753 of the signal strength estimation unit 75 reads the adjustment operation amount of each adjustment knob 32 of the adjustment operation unit 3 (step S1).
  • the test key note output unit 751 of the signal strength estimating unit 75 outputs the test key note TNOTE from the audio signal generation unit OP1 'to the audio signal generation unit OP4' (step S2), and generates a synthetic audio signal (step S2). S3).
  • the test key note obtaining unit 81 obtains the test key note TNOTE output from the test key note output unit 751 (step S4).
  • the synthetic sound signal detection unit 752 detects the signal strength of the synthetic sound signal using the synthetic sound signal added by the input side adder 73B as a basic frequency having a frequency corresponding to the test keynote TNOTE (step S5).
  • the noise signal detection unit 82 includes a fundamental sound having a frequency corresponding to the test keynote TNOTE and a frequency of a harmonic (a frequency ratio other than an integer) included in the synthesized sound signal detected by the synthesized sound signal detection unit 752.
  • the fundamental sound and the overtone whose basic frequency is the frequency obtained by multiplying the frequency according to the test keynote TNOTE by the frequency ratio
  • the synthetic sound other than the frequency of the scale set by the different scale setting unit 84 A noise signal in the signal is detected (step S6).
  • the noise signal detection unit 82 determines whether the detection of the noise signal has been completed for all the test keynotes TNOTE (step S7). If not finished, the test key note TNOTE is changed, and the procedure from step S2 is repeated. When the test is completed, the noise component accumulation unit 83 accumulates a noise component for each test keynote TNOTE in the storage area (step S8).
  • the input key note determination unit 91 collates the input key note KNOTE output by tapping the MIDI keyboard 4 by the operator with the test key note TNOTE stored by the noise component storage unit 83 (procedure). S9). Next, the input key note determination section 91 reads out the peaks N1 to N4 of the signal intensity of the noise component corresponding to the input key note KNOTE (step S10). The noise signal reduction unit 92 attenuates or eliminates the signal strength peaks N1 to N4 in the noise band of the synthesized sound signal output from the sound synthesizer unit 6 (step S11).
  • the FM synthesizer 1 has a fundamental frequency and a fundamental frequency based on the frequency according to the input keynote KNOTE (in the case of setting a frequency ratio other than an integer, the frequency according to the test keynote TNOTE is multiplied by the frequency ratio).
  • a fundamental sound with a fundamental frequency as a fundamental frequency and a harmonic sound) and a synthetic sound signal of the scale set by the different scale setting unit 84 are output, and a sound is output (step S12).
  • the noise signal detection unit 82 is a base tone and a harmonic that have a frequency corresponding to the keynote KNOTE obtained by operating the MIDI keyboard 4 by the operator as a fundamental frequency.
  • the peaks N1 to N4 of the signal strength of the noise signal other than the fundamental tone and the overtone whose fundamental frequency is the frequency obtained by multiplying the frequency according to the keynote TNOTE by the frequency ratio are detected.
  • the noise signal reduction unit 92 attenuates or eliminates the peak N1 to the peak N4 of the signal strength of the detected noise signal.
  • the FM synthesizer 1 can output a sound signal of a scale corresponding to a key-pressing position of the MIDI keyboard 4 by the operator, so that the sound signal output from the FM synthesizer 1, which is difficult to set, does not break down. , Can output a sound corresponding to the keynote KNOTE.
  • the FM synthesizer 1 employs the noise signal detection unit 82, the noise component storage unit 83, the input key note determination unit 91, and the noise signal reduction unit 92.
  • the noise reduction unit 9 of the present embodiment is suitable for the FM synthesizer 1 because the noise component can be attenuated or eliminated even if the noise component is at an arbitrary frequency.
  • the present invention is not limited to the above-described embodiment, but includes the following modifications.
  • the present invention is applied to the FM synthesizer 1, but the present invention is not limited to this. That is, the noise reduction unit 9 described above may be applied to an electronic musical instrument such as an electronic piano, an electronic organ, an electric guitar, and an electronic woodwind instrument to attenuate and eliminate noise components.
  • the audio signal generators OP1 to OP4 and the audio signal generators OP1 ′ to OP4 ′ are configured by the DSP, but the present invention is not limited to this. . All configurations may be configured as a computer-readable noise reduction program. In addition, the present invention may be applied to other structures and configurations as long as the object of the present invention can be achieved.
  • Limit amount notification unit 81 Test key note acquisition section, 82: noise signal detection section, 83: noise component storage section, 84: different scale setting section, 91: input key note determination section, 92: noise signal reduction section, 321: main body, 322: adjustment Position display markers, 323: Base, 324: Rotating axis, 325: Circuit board, 326: Rotating resistor, 327: LED light emitting unit, 751: Test key note output unit, 752: Synthetic sound signal detecting 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, N1: peak, N4: peak, OP1: acoustic signal generation unit OP2: sound signal generation unit, OP3: sound signal generation unit, OP4: sound signal generation unit, OP1 ': sound signal generation unit, OP2': sound signal generation unit, OP3 ': sound signal generation unit ,

Abstract

This musical performance device outputs an acoustic signal of a frequency which is in accordance with an operation performed by an operator, and the device comprises: a noise signal detection unit (82) that detects the signal strength of a noise signal of a frequency other than that of the acoustic signal which is in accordance with the operation performed by the operator; and a noise signal reducing unit (92) that attenuates or eliminates the signal strength of the noise signal detected by the noise signal detection unit (82).

Description

演奏装置およびノイズ削減プログラムPerformance equipment and noise reduction program
　本発明は、演奏装置およびノイズ削減プログラムに関する。 The present invention relates to a performance device and a noise reduction program.
　従来、電子楽器としてＦＭシンセサイザー等の演奏装置が知られている（たとえば、特許文献１参照）。
　ＦＭシンセサイザーは、第１のオシレータから発振された搬送波を、第２のオシレータから発振された変調波により変調して様々な音響信号を生成する。そして、ＦＭシンセサイザーに接続された電子鍵盤等により入力されたキーノートに基づいて、音階のある音響信号を出力することができる。 2. Description of the Related Art Conventionally, a performance device such as an FM synthesizer has been known as an electronic musical instrument (for example, see Patent Document 1).
The FM synthesizer modulates a carrier wave oscillated from the first oscillator with a modulated wave oscillated from the second oscillator to generate various acoustic signals. Then, an acoustic signal having a musical scale can be output based on a key note input from an electronic keyboard or the like connected to the FM synthesizer.
　しかしながら、ＦＭシンセサイザーでは、搬送波および変調波の組み合わせが無限にあり、オシレータの調整の組み合わせによっては電子鍵盤の打鍵位置によらず、音高が定まらずノイズに埋もれてしまい、楽器としての機能を呈さない場合がある。
　従来、特許文献２では、スピーチ成分およびノイズ成分を含む音響信号から特定の周波数帯域について、フィルター処理を行うことによって、出力される音響信号のスピーチ成分の明瞭化を図る技術が開示されている。 However, in FM synthesizers, there are an infinite number of combinations of carrier waves and modulation waves, and depending on the combination of oscillator adjustments, the pitch is not fixed and buried in noise regardless of the keying position of the electronic keyboard, thus exhibiting a function as a musical instrument. May not be.
2. Description of the Related Art Conventionally, Patent Literature 2 discloses a technique for clarifying a speech component of an output audio signal by performing a filtering process on a specific frequency band from an audio signal including a speech component and a noise component.
特開平４－１６１９９４号公報JP-A-4-161994 特開２０１０－５２１７０４号公報JP 2010-521704 A
　しかしながら、前記特許文献２に開示の技術では、環境ノイズ等のある程度周波数帯域が判るノイズ成分を除去することしかできない。これに対して、ＦＭシンセサイザーの場合、搬送波および変調波の周波数を自由に設定できるため、ノイズ成分の発生分布が一様ではなく、フィルター処理では対応できないという課題がある。 However, the technique disclosed in Patent Document 2 can only remove a noise component whose frequency band is known to some extent, such as environmental noise. On the other hand, in the case of the FM synthesizer, since the frequencies of the carrier wave and the modulation wave can be set freely, there is a problem in that the distribution of noise components generated is not uniform and cannot be dealt with by filter processing.
　本発明の目的は、ノイズ成分の発生分布によらずノイズを除去して、操作者の操作に応じた周波数の音響信号を出力することのできる演奏装置およびノイズ削減プログラムを提供することにある。 An object of the present invention is to provide a performance apparatus and a noise reduction program capable of removing a noise irrespective of the distribution of occurrence of a noise component and outputting an acoustic signal having a frequency corresponding to an operation of an operator.
　本発明の演奏装置は、操作者の操作に応じた周波数の音響信号を出力する演奏装置であって、前記操作者の操作に応じた音響信号の周波数以外のノイズ信号の信号強度を検出するノイズ信号検出部と、前記ノイズ信号検出部により検出されたノイズ信号の信号強度を、減衰または消去するノイズ信号削減部と、を備える。
　本発明のノイズ削減プログラムは、コンピュータを前述の演奏装置として機能させる。 A performance device according to the present invention is a performance device that outputs an audio signal having a frequency corresponding to an operation of an operator, and a noise detecting a signal intensity of a noise signal other than the frequency of the audio signal according to the operation of the operator. A signal detection unit; and a noise signal reduction unit that attenuates or eliminates the signal strength of the noise signal detected by the noise signal detection unit.
The noise reduction program of the present invention causes a computer to function as the above-described performance device.
本発明の実施の形態に係る音響装置を示すブロック図。FIG. 1 is a block diagram showing an acoustic device according to an embodiment of the present invention. 前記実施の形態における調整つまみの構造を示す平面図。FIG. 4 is a plan view showing a structure of an adjustment knob according to the embodiment. 前記実施の形態における調整つまみの構造を示す断面図。Sectional drawing which shows the structure of the adjustment knob in the said embodiment. 前記実施の形態における音響信号生成部および音響信号合成部の構造を示すブロック図。FIG. 2 is a block diagram showing a structure of an audio signal generation unit and an audio signal synthesis unit according to the embodiment. 前記実施の形態における変調波の波形に応じて生成される音響信号の信号強度を示すグラフ。5 is a graph showing the signal strength of an acoustic signal generated according to the waveform of a modulated wave in the embodiment. 前記実施の形態における合成音響信号の信号強度を示すグラフ。4 is a graph showing the signal strength of a synthetic acoustic signal according to the embodiment. 前記実施の形態における音響信号生成部、音響信号合成部、信号強度推定部、および限界量報知部を示すブロック図。FIG. 3 is a block diagram showing an audio signal generation unit, an audio signal synthesis unit, a signal strength estimation unit, and a limit amount notification unit in the embodiment. 前記実施の形態における信号強度推定部および限界量報知部を示すブロック図。FIG. 3 is a block diagram illustrating a signal strength estimating unit and a limit amount notifying unit according to the embodiment. 前記実施の形態におけるノイズリダクション部を示すブロック図。FIG. 2 is a block diagram showing a noise reduction unit according to the embodiment. 前記実施の形態におけるノイズ成分分析部による分析結果を示すグラフ。9 is a graph showing an analysis result by the noise component analyzer in the embodiment. 前記実施の形態におけるノイズリダクション部によるノイズの減衰を示すグラフ。4 is a graph illustrating noise attenuation by a noise reduction unit according to the embodiment. 前記実施の形態における作用を説明するためのフローチャート。4 is a flowchart for explaining the operation in the embodiment.
　以下、本発明の実施の一形態を図面に基づいて説明する。図１には、本発明の実施の形態に係るＦＭ（Frequency Modulation）シンセサイザー１が示されている。
　演奏装置としてのＦＭシンセサイザー１は、シンセサイザー本体２および調整操作ユニット３を備え、ＭＩＤＩキーボード４から出力されたキーノートに応じた音程の音響信号を生成して、外部に音声出力する。調整操作ユニット３は、シンセサイザー本体２が有する複数のオシレータのゲイン、周波数比を調整する調整つまみ３２を複数備え、操作者がそれぞれの調整つまみ３２を操作することにより、出音用ＦＭシンセサイザー部６に異なる音色の音響信号を生成させる。 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 as a performance device includes a synthesizer main body 2 and an adjustment operation unit 3, generates an acoustic signal having a pitch corresponding to a key note output from the MIDI keyboard 4, and outputs the sound to the outside. The adjustment operation unit 3 includes a plurality of adjustment knobs 32 for adjusting gains and frequency ratios of a plurality of oscillators included in the synthesizer main body 2. When the operator operates each of the adjustment knobs 32, the sound output FM synthesizer unit 6 is provided. To generate acoustic signals of different timbres.
　調整操作ユニット３は、ボックス状のケース３１と、複数の調整つまみ３２とを備える。本実施の形態では、シンセサイザー本体２の調整可能な音響信号生成部ＯＰ１から音響信号生成部ＯＰ４に応じて、４×４＝１６個の調整つまみ３２が設けられている。
　調整操作部としての調整つまみ３２は、ケース３１の上面に回転可能に設けられ、図２および図３に示すように、操作つまみ本体３２１、調整位置表示マーカー３２２、およびつまみ基部３２３を備える。 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 are provided in accordance with the adjustable audio signal generation unit OP1 to the audio signal generation unit OP4 of the synthesizer body 2.
The adjustment knob 32 as an adjustment operation unit is rotatably provided on the upper surface of the case 31, and includes an operation knob main body 321, an adjustment position display marker 322, and a knob base 323, as shown in FIGS.
　操作つまみ本体３２１は、黒色のゴム等の不透光性材料から構成され、ケース３１上に回転自在に保持される。
　調整位置表示マーカー３２２およびつまみ基部３２３は、レンズ材料等の導光性材料から構成される。つまり、調整位置表示マーカー３２２およびつまみ基部３２３は、後述するＬＥＤ発光部３２７が発光することにより、発光色に応じて、操作つまみ本体３２１の周囲や、調整位置表示マーカー３２２を発光させる導光体として機能する。 The operation knob main body 321 is made of an opaque material such as black rubber and is rotatably held on the case 31.
The adjustment position display marker 322 and the knob base 323 are made of a light guide material such as a lens material. That is, the adjustment position display marker 322 and the knob base 323 emit light from the LED light emitting unit 327, which will be described later, so as to emit light around the operation knob main body 321 or the adjustment position display marker 322 according to the emission color. Function as
　調整位置表示マーカー３２２は、操作つまみ本体３２１に形成された切欠部に挿入され、操作つまみ本体３２１を回転させた際の調整量を操作者に視認させる。
　つまみ基部３２３は、操作つまみ本体３２１の底部に設けられ、操作つまみ本体３２１の回転に応じて回転するように支持されている。また、つまみ基部３２３は、径方向外周端部が操作つまみ本体３２１の外側に突出している。 The adjustment position display marker 322 is inserted into a notch formed in the operation knob main body 321 to allow the operator to visually recognize the adjustment amount when the operation knob main body 321 is rotated.
The knob base 323 is provided at the bottom of the operation knob main body 321 and is supported so as to rotate in accordance with the rotation of the operation knob main body 321. The knob base 323 has a radially outer end protruding outside the operation knob main body 321.
　つまみ基部３２３の回転中心には、回転軸３２４が設けられ、回転軸３２４の先端は、回路基板３２５上に設けられた回転抵抗器３２６に接続される。回転抵抗器３２６には、複数色に発光するＬＥＤ発光部３２７が隣接して設けられている。
　視覚的手段としてのＬＥＤ発光部３２７は、シンセサイザー本体２からの制御信号により駆動し、制御信号に応じて、赤色、緑色、青色を単独または組み合わせて発光することにより、さまざまな色に発光する。 A rotation shaft 324 is provided at the center of rotation of the knob base 323, and a tip of the rotation shaft 324 is connected to a rotation resistor 326 provided on the circuit board 325. An LED light emitting unit 327 that emits light of a plurality of colors is provided adjacent to the rotating resistor 326.
The LED light emitting unit 327 as a visual means is driven by a control signal from the synthesizer main body 2 and emits red, green, and blue light alone or in combination in accordance with the control signal, thereby emitting light of various colors.
　そして、調整つまみ３２、回転軸３２４、回転抵抗器３２６、およびＬＥＤ発光部３２７が本発明の特徴量調整部として機能する。
　なお、本実施の形態では、調整操作ユニット３をハードウェアとして構成しているが、これに限られない。たとえば、コンピュータの画面上に表示される画像として構成される特徴量調整部としてもよい。 Then, the adjustment knob 32, the rotating shaft 324, the rotating resistor 326, and the LED light emitting unit 327 function as a feature amount adjusting unit of the present invention.
In the present embodiment, the adjustment operation unit 3 is configured as hardware, but is not limited to this. For example, a feature amount adjustment unit configured as an image displayed on a screen of a computer may be used.
　シンセサイザー本体２は、図１に示すように、入力されたキーノートKNOTEに応じた音階の音響信号を生成して、音声出力する。シンセサイザー本体２は、パラメータ選択部５、出音用ＦＭシンセサイザー部６、分析用ＦＭシンセサイザー部７、ノイズ成分分析部８、およびノイズリダクション部９を備える。
　パラメータ選択部５は、シンセサイザー本体２により生成および出力する音響信号の波形を選択する部分であり、選択可能な波形としては、たとえば、サイン波Ｗ１、三角波Ｗ２、ノコギリ波Ｗ３、矩形波Ｗ４を例示できる（図５参照）。選択された波形、周波数比、入力側増幅器６４Ａの増幅率および出力側増幅器６３Ａの増幅率は、出音用ＦＭシンセサイザー部６および分析用ＦＭシンセサイザー部７に出力される。 As shown in FIG. 1, the synthesizer body 2 generates a sound signal of a scale corresponding to the input keynote KNOTE, and outputs the sound signal. 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 section 5 is a section for selecting a waveform of an acoustic signal generated and output by the synthesizer body 2, and examples of selectable waveforms include a sine wave W1, a triangular wave W2, a sawtooth wave W3, and a rectangular wave W4. (See FIG. 5). The selected waveform, frequency ratio, amplification factor of the input-side amplifier 64A, and amplification factor of the output-side amplifier 63A are output to the FM synthesizer unit 6 for sound output and the FM synthesizer unit 7 for analysis.
　出音用ＦＭシンセサイザー部６は、図４に示すように、ＤＳＰ（Digital Signal Processor）から構成され、音響信号生成部ＯＰ１から音響信号生成部ＯＰ４までを複数備える。
　音響信号生成部ＯＰ１から音響信号生成部ＯＰ４は、出音用ＦＭシンセサイザー部６で使用する搬送波および変調波に基づいて出力する音響信号を生成する。
　音響信号生成部ＯＰ１は、オシレータ６１、増幅器６２、信号出力部６３、出力側増幅器６３Ａ、および変調波入力部６４を備える。音響信号生成部ＯＰ２から音響信号生成部ＯＰ４も同様の構成である。 As shown in FIG. 4, the FM synthesizer 6 for sound output includes a DSP (Digital Signal Processor), and includes a plurality of audio signal generation units OP1 to OP4.
The sound signal generation units OP1 to OP4 generate sound signals to be output based on the carrier wave and the modulated wave used in the FM synthesizer unit 6 for sound output.
The acoustic signal generation unit OP1 includes an oscillator 61, an amplifier 62, a signal output unit 63, an output amplifier 63A, and a modulated wave input unit 64. The sound signal generation units OP2 to OP4 have the same configuration.
　オシレータ６１は、パラメータ選択部５で選択された波形から所定の周波数比の搬送波を生成し、入力された変調波により、搬送波を変調する。具体的には、オシレータ６１は、ＭＩＤＩキーボード４から入力されたキーノートKNOTEに応じた周波数の搬送波を生成して、変調波により変調する。
　たとえば、図５に示すように、変調波がサイン波Ｗ１である場合、キーノートKNOTEとして入力された周波数の搬送波に対して、オシレータ６１は、調整操作ユニット３の調整つまみ３２で設定された周波数比のサイン波Ｗ１で変調する。変調後に出力される音響信号の信号強度は、キーノートKNOTEに応じた周波数f_inをピークとするパターンＰＴ１のようになる。 The oscillator 61 generates a carrier having a predetermined frequency ratio from the waveform selected by the parameter selection unit 5, and modulates the carrier with the input modulated wave. Specifically, the oscillator 61 generates a carrier having a frequency corresponding to the keynote KNOTE input from the MIDI keyboard 4, and modulates the carrier with a modulation wave.
For example, as shown in FIG. 5, when the modulated wave is a sine wave W1, the oscillator 61 adjusts the frequency set by the adjustment knob 32 of the adjustment operation unit 3 with respect to the carrier of the frequency input as the keynote KNOTE. Modulation is performed with the ratio sine wave W1. The signal strength of the acoustic signal output after the modulation is like a pattern PT1 having a peak at a frequency f_in according to the keynote KNOTE.
　同様に、変調波が三角波Ｗ２である場合、変調後の出力される音響信号の信号強度は、パターンＰＴ２のようになり、変調波がノコギリ波Ｗ３である場合、変調後に出力される音響信号の信号強度は、パターンＰＴ３のようになり、変調波が矩形波Ｗ４である場合、変調後に出力される音響信号の信号強度は、パターンＰＴ４のようになる。
　すなわち、搬送波が変調波により変調されると、変調波の波形によっては、キーノートKNOTEに応じた周波数f_in以外の周波数の信号強度のピークを有する音響信号が生成される。 Similarly, when the modulating wave is the triangular wave W2, the signal intensity of the output acoustic signal after the modulation is like the pattern PT2, and when the modulating wave is the sawtooth wave W3, the acoustic signal output after the modulation is The signal strength is as shown in a pattern PT3. When the modulated wave is a rectangular wave W4, the signal strength of the acoustic signal output after the modulation is as shown in a pattern PT4.
That is, when the carrier is modulated by the modulation wave, an acoustic signal having a signal strength peak at a frequency other than the frequency f_in according to the keynote KNOTE is generated depending on the waveform of the modulation wave.
　増幅器６２は、オシレータ６１から出力された音響信号を増幅する。増幅率は、キーノートKNOTEに含まれるＭＩＤＩキーボード４の打鍵の強さに応じて設定される。
　信号出力部６３は、オシレータ６１で生成された音響信号を音響信号合成部６５に出力する。また、信号出力部６３から出力された音響信号は、音響信号生成部ＯＰ１の変調波入力部６４にフィードバックされるとともに、他の音響信号生成部ＯＰ２、音響信号生成部ＯＰ３、および音響信号生成部ＯＰ４の変調波入力部６４に出力される。 The amplifier 62 amplifies the acoustic signal output from the oscillator 61. The amplification factor is set in accordance with the keystroke strength of the MIDI keyboard 4 included in the keynote KNOTE.
The signal output unit 63 outputs the audio signal generated by the oscillator 61 to the audio signal synthesis unit 65. 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 units OP2, OP3, and the acoustic signal generation unit It is output to the modulated wave input unit 64 of OP4.
　同様に音響信号生成部ＯＰ２、音響信号生成部ＯＰ３、および音響信号生成部ＯＰ４のそれぞれの信号出力部６３から出力された音響信号も、自己の変調波入力部６４にフィードバックされるとともに、他の音響信号生成部の変調波入力部６４に出力される。
　変調波入力部６４は、複数の入力側増幅器６４Ａおよび入力側加算器６４Ｂを備える。
　入力側増幅器６４Ａは、入力される音響信号に応じて複数設けられ、音響信号生成部ＯＰ１であれば、自己が出力したフィードバックされた音響信号、および他の音響信号生成部ＯＰ２から音響信号生成部ＯＰ４で生成され、入力された音響信号を増幅する。増幅率は、調整操作ユニット３の調整つまみ３２を調整することにより調整することができる。
　入力側加算器６４Ｂは、入力側増幅器６４Ａから入力された複数の音響信号を加算して、オシレータ６１に変調波として出力する。 Similarly, the audio signals output from the respective signal output units 63 of the audio signal generation unit OP2, the audio signal generation unit OP3, and the audio signal generation unit OP4 are also fed back to the own modulation wave input unit 64, and other signals are output. The signal is output to the modulated wave input unit 64 of the acoustic signal generation unit.
The modulation wave input section 64 includes a plurality of input-side amplifiers 64A and an input-side adder 64B.
A plurality of input-side amplifiers 64A are provided in accordance with the input audio signal. If the input-side amplifier 64A is the audio signal generation unit OP1, the input-side amplifier 64A outputs the feedback-output audio signal and the audio signal generation unit OP2 from the other audio signal generation unit OP2. The audio signal generated and input in OP4 is amplified. 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 audio signals input from the input-side amplifier 64A and outputs the result to the oscillator 61 as a modulated wave.
　本実施の形態では、４つの音響信号生成部ＯＰ１から音響信号生成部ＯＰ４を備えているので、それぞれの４つのオシレータ６１の前段に設けられている４つの入力側増幅器６４Ａによって増幅される音響信号の強度を調整して、最終的な音響信号を出力する。つまり、本実施の形態では、１６カ所の調整が可能となり、調整操作ユニット３の調整操作つまみ３２の数に対応する。
　本実施の形態では、ＦＭシンセサイザー１が多入力１出力の音響信号生成部ＯＰ１から音響信号生成部ＯＰ４を備えているため、音色が多岐に亘った音響信号を生成できる。しかし、その反面、調整操作ユニット３をどのように操作すれば、所望の音色の音響信号を生成することができるのか予測がつかず、操作者による調整操作が困難を極めるシンセサイザーとなっている。 In the present embodiment, since four sound signal generation units OP1 to OP4 are provided, the sound signals amplified by the four input-side amplifiers 64A provided before the four oscillators 61, respectively. Is adjusted to output a final acoustic signal. That is, in the present embodiment, 16 adjustments are possible, 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 audio signal generation units OP1 to OP4 with multiple inputs and one output, it is possible to generate audio signals with a wide variety of timbres. On the other hand, however, it is difficult to predict how to operate the adjustment operation unit 3 to generate an audio signal of a desired timbre, and the synthesizer is extremely difficult for an operator to perform the adjustment operation.
　信号出力部６３は、音響信号生成部ＯＰ１から音響信号生成部ＯＰ４で生成された音響信号を出力する。
　出力側増幅器６３Ａは、音響信号生成部ＯＰ１から音響信号生成部ＯＰ４で生成された音響信号を所定の増幅率で増幅する。増幅率は、調整操作ユニット３の調整つまみ３２を調整することにより調整することができる。 The signal output unit 63 outputs the audio signal generated by the audio signal generation unit OP4 from the audio signal generation unit OP1.
The output-side amplifier 63A amplifies the audio signal generated by the audio signal generation unit OP1 to the audio signal generation unit OP4 at a predetermined amplification factor. The amplification factor can be adjusted by adjusting the adjustment knob 32 of the adjustment operation unit 3.
　音響信号合成部６５は、音響信号生成部ＯＰ１から音響信号生成部ＯＰ４のそれぞれから出力された音響信号を加算または乗算し、ＦＭシンセサイザー１の音響信号として出力する。音響信号合成部６５は、加算器６６、フィルター部６７、および増幅器７０を備える。
　加算器６６は、音響信号生成部ＯＰ１から音響信号生成部ＯＰ４のそれぞれから出力された音響信号を加算して、音声出力用の合成音響信号を生成する。 The sound signal synthesis unit 65 adds or multiplies the sound signals output from the sound signal generation unit OP1 to the sound signal generation unit OP4, and outputs the result as the sound signal of the FM synthesizer 1. The sound signal synthesizing unit 65 includes an adder 66, a filter unit 67, and an amplifier 70.
The adder 66 adds the audio signals output from each of the audio signal generation units OP1 to OP4 to generate a synthesized audio signal for audio output.
　フィルター部６７は、第１加算器６６で加算された合成音響信号に対してフィルター処理を行う。フィルター部６７のフィルターは、所望の音色の音響信号に加工するために所望のフィルター特性に設定される。
　増幅器７０は、出力する合成音響信号を増幅する。増幅された合成音響信号は、スピーカー等によって音声出力される。 The filter unit 67 performs a filtering process on the synthesized acoustic signal added by the first adder 66. The filter of the filter section 67 is set to have a desired filter characteristic in order to process the sound signal into a desired sound color.
The amplifier 70 amplifies the output synthetic acoustic signal. The amplified synthesized sound signal is output as a sound by a speaker or the like.
　出力される合成音響信号は、音響信号生成部ＯＰ１から音響信号生成部ＯＰ４のオシレータ６１の波形、周波数比、出力側増幅器６３Ａの増幅率、および入力側増幅器６４Ａの増幅率によって種々変化する。たとえば、合成音響信号としては、入力されたキーノートKNOTEに応じた周波数f_inに対して、異なる周波数の合成音響信号が出力される。たとえば、図６に示すように、サイン波Ｗ１で変調している場合であれば、出力強度パターンＰＯ１のように、周波数f_inが最大値をとり、周波数の信号強度は、周波数が高くなるにしたがって減衰していく。したがって、聴取者は、出力された合成音響信号の音階を識別することができる。 (4) The output synthetic audio signal varies depending on the waveform of the oscillator 61 of the audio signal generation unit OP1 to the audio signal generation unit OP4, the frequency ratio, the amplification factor of the output amplifier 63A, and the amplification factor of the input amplifier 64A. For example, as the synthesized sound signal, a synthesized sound signal having a different frequency from the frequency f_in corresponding to the input keynote KNOTE is output. For example, as shown in FIG. 6, if the signal is modulated by 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 increases as the frequency increases. Decays. Therefore, the listener can identify the scale of the output synthesized acoustic signal.
　しかし、三角波Ｗ２で変調した出力強度パターンＰＯ２から矩形波Ｗ４で変調した出力強度パターンＰＯ４のように、徐々にキーノートKNOTEに応じた周波数f_inの信号強度が他の周波数の信号強度に埋もれてしまい、キーノートKNOTEに応じた音程の出力ができない。つまり、操作者がＭＩＤＩキーボード４のどの鍵盤を打鍵しても、高周波ノイズ音しか出力されなくなり、楽器として破綻してしまう。
　そこで、本実施の形態のＦＭシンセサイザー１では、出力される合成音響信号が、高周波ノイズ音のみとなり、楽器として破綻する、ということがないように操作することができるナビゲーション機能を持たせている。 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 another frequency. , Cannot output the pitch according to the keynote KNOTE. That is, no matter what 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 audio signal is only a high-frequency noise sound and does not break down as a musical instrument.
　分析用ＦＭシンセサイザー部７は、図７に示すように、出音用ＦＭシンセサイザー部６と同様にＤＳＰから構成された複数の音響信号生成部ＯＰ１’から音響信号生成部ＯＰ４’と、出力側増幅器７２Ａと、加算器７４と、信号強度推定部７５と、限界量報知部７６とを備える。
　音響信号生成部ＯＰ１’から音響信号生成部ＯＰ４’のそれぞれは、オシレータ７１、信号出力部７２、および搬送信号入力部７３を備える。搬送信号入力部７３は、入力側増幅器７３Ａおよび入力側加算器７３Ｂを備える。 As shown in FIG. 7, the analysis FM synthesizer unit 7 includes a plurality of sound signal generation units OP1 ′ to OP4 ′ each including a DSP and an output-side amplifier, similarly to the sound output FM synthesizer unit 6. 72A, an adder 74, a signal strength estimating unit 75, and a limit amount notifying unit 76.
Each of the acoustic signal generation units OP1 ′ to OP4 ′ includes an oscillator 71, a signal output unit 72, and a carrier signal input unit 73. The carrier signal input unit 73 includes an input-side amplifier 73A and an input-side adder 73B.
　これらの構成は、出音用ＦＭシンセサイザー部６の音響信号生成部ＯＰ１から音響信号生成部ＯＰ４と同様の構成である。なお、それぞれのオシレータ７１には、シンセサイザー本体２内で生成されるテスト用キーノートTNOTEが入力され、オシレータ７１は、テスト用キーノートTNOTEの周波数に応じた搬送波を、複数の調整つまみ３２の調整状態に応じて生成した変調波により変調する。
　加算器７４は、音響信号生成部ＯＰ１’から音響信号生成部ＯＰ４’のそれぞれで生成された音響信号を加算または乗算し、合成音響信号として信号強度推定部７５に出力する。 These configurations are the same as those of the audio signal generation units OP1 to OP4 of the sound output FM synthesizer unit 6. Note that each of the oscillators 71 receives a test keynote TNOTE generated in the synthesizer body 2, and the oscillator 71 adjusts a carrier corresponding to the frequency of the test keynote TNOTE by adjusting a plurality of adjustment knobs 32. Modulation is performed by the modulation wave generated according to the state.
The adder 74 adds or multiplies the sound signals generated by the sound signal generation units OP1 ′ to OP4 ′, and outputs the result to the signal strength estimation unit 75 as a synthesized sound signal.
　信号強度推定部７５および限界量報知部７６は、図示しないコンピュータの演算処理装置上で実行されるプログラムまたは記憶装置上確保された記憶領域として構成される。
　信号強度推定部７５は、図８に示すように、テスト用キーノート出力部７５１、合成音響信号検出部７５２、操作量変更部７５３、限界量判定部７５４、および調整つまみ選択部７５５を備える。また、信号強度推定部７５には、調整操作ユニット３のそれぞれの調整つまみ３２の番号と、その調整つまみ３２の調整操作量が出力され、後述する限界量判定部７５４による限界量判定に供される。 The signal strength estimating unit 75 and the limit amount notifying unit 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.
As shown in FIG. 8, the signal strength estimating section 75 includes a test key note output section 751, a synthetic sound signal detecting section 752, an operation amount changing section 753, a limit amount determining section 754, and an adjustment knob selecting section 755. Further, the number of each adjustment knob 32 of the adjustment operation unit 3 and the adjustment operation amount of the adjustment knob 32 are output to the signal strength estimating unit 75, and are used for limit amount determination by a limit amount determination unit 754 described later. You.
　テスト用キーノート出力部７５１は、音響信号生成部ＯＰ１’から音響信号生成部ＯＰ４’に対して、テスト用キーノートTNOTEを出力する。音響信号生成部ＯＰ１’から音響信号生成部ＯＰ４’は、テスト用キーノートTNOTEに基づいて、音響信号を生成する。
　また、テスト用キーノート出力部７５１は、出力したテスト用キーノートTNOTEに応じた周波数を限界量判定部７５４に出力する。 The test key note output unit 751 outputs the test key note TNOTE from the audio signal generation unit OP1 'to the audio signal generation unit OP4'. The sound signal generation units OP1 'to OP4' generate sound signals based on the test keynote TNOTE.
Further, the test key note output unit 751 outputs a frequency corresponding to the output test key note TNOTE to the limit amount determination unit 754.
　調整つまみ選択部７５５は、音響信号生成部ＯＰ１’から音響信号生成部ＯＰ４’のうち、オシレータ７１の調整を行う調整つまみ３２を選択する。具体的には、調整つまみ選択部７５５は、調整対象となるオシレータ７１、そのオシレータ７１の変調波形、出力される音響信号の強度、周波数比、およびそのオシレータ７１あるいは他のオシレータ７１に入力される音響信号の強度を調整する調整つまみ３２を選択する。調整つまみ選択部７５５は、選択された調整つまみ３２を限界量判定部７５４に出力する。 The adjustment knob selection unit 755 selects the adjustment knob 32 for adjusting the oscillator 71 from the audio signal generation units OP1 'to OP4'. Specifically, the adjustment knob selection unit 755 inputs the oscillator 71 to be adjusted, the modulation waveform of the oscillator 71, the intensity and frequency ratio of the output acoustic signal, and the oscillator 71 or another oscillator 71. An adjustment knob 32 for adjusting the intensity of the sound signal is selected. The adjustment knob selection unit 755 outputs the selected adjustment knob 32 to the limit amount determination unit 754.
　合成音響信号検出部７５２は、加算器７４により加算された音響信号生成部ＯＰ１’から音響信号生成部ＯＰ４’で生成された音響信号を合成した合成音響信号を検出する。
　合成音響信号検出部７５２は、検出した合成音響信号を、ＦＦＴ（Fast Fourier Transform）等により、周波数に応じた信号強度に変換して信号強度の分布を取得し、限界量判定部７５４に出力する。 The synthesized sound signal detection unit 752 detects a synthesized sound signal obtained by synthesizing the sound signals generated by the sound signal generation unit OP4 ′ and the sound signal generation unit OP4 ′ added by the adder 74.
The synthesized acoustic signal detection unit 752 converts the detected synthesized audio signal into a signal intensity corresponding to a frequency by FFT (Fast Fourier Transform) or the like, acquires a distribution of the signal intensity, and outputs the distribution to the limit amount determination unit 754. .
　操作量変更部７５３は、調整操作ユニット３の調整つまみ３２の調整操作と同様に、音響信号生成部ＯＰ１’から音響信号生成部ＯＰ４’にそれぞれのオシレータ７１の変調波の波形、周波数比、増幅率、および入力側増幅器７３Ａの増幅率の調整操作量を出力する。具体的には、操作量変更部７５３は、調整操作ユニット３のそれぞれの調整つまみ３２の調整量に応じて、すべての調整つまみ３２の調整操作量の組み合わせを調整操作量として出力する。
　また、操作量変更部７５３は、音響信号生成部ＯＰ１’から音響信号生成部ＯＰ４’に出力した調整操作量を限界量判定部７５４に出力する。 Like the adjustment operation of the adjustment knob 32 of the adjustment operation unit 3, the operation amount changing unit 753 causes the audio signal generation unit OP1 'to send the audio signal generation unit OP4' the waveform, frequency ratio, and amplification of the modulated wave of each oscillator 71. It outputs the rate and the amount of adjustment operation of the amplification factor of the input side amplifier 73A. 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 amounts according to the adjustment amounts of the respective adjustment knobs 32 of the adjustment operation unit 3.
Further, the operation amount changing unit 753 outputs the adjustment operation amount output from the audio signal generation unit OP1 ′ to the audio signal generation unit OP4 ′ to the limit amount determination unit 754.
　限界量判定部７５４は、操作量変更部７５３から出力された調整操作量に基づいて設定された、変調波の波形、周波数比、出力側増幅器７２Ａの増幅率、および入力側増幅器７３Ａの増幅率により変調された合成音響信号が、音声出力したときに破綻しているか否かを判定する。具体的には、限界量判定部７５４は、テスト用キーノートTNOTEに応じた周波数を基本周波数として、基音、第２倍音、および第３倍音の信号強度と、合成音響信号中に含まれる他の周波数成分の信号強度とのＳ／Ｎ比により、出力される合成音響信号の破綻の有無を判定する。テスト用キーノートTNOTEに応じた周波数を基本周波数として、基音と倍音の信号強度と、合成音響信号中に含まれる他の周波数成分の信号強度とのＳ／Ｎ比が所定の閾値よりも小さい場合には、調整操作量が限界量を超え、破綻していると判定する。 The limit amount determination unit 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 unit 753. It is determined whether or not the synthesized acoustic signal modulated according to the above is broken when sound is output. Specifically, the limit amount determination unit 754 uses the frequency according to the test keynote TNOTE as the fundamental frequency, and sets the signal intensity of the fundamental tone, the second overtone, and the third overtone, and other signals included in the synthesized acoustic signal. Based on the S / N ratio with the signal strength of the frequency component, it is determined whether or not the output synthesized acoustic signal is broken. When the frequency according to the test keynote TNOTE is used as the basic frequency, and the S / N ratio between the signal strength of the fundamental tone and the overtone and the signal strength of the other frequency components included in the synthesized sound signal is smaller than a predetermined threshold. In this case, it is determined that the adjustment operation amount exceeds the limit amount and the bank is broken.
　ここで、音響信号生成部ＯＰ１’から音響信号生成部ＯＰ４’で生成する合成音響信号は、出音用ＦＭシンセサイザー部６の設定と同じ設定により生成される音響信号とは異なり、出音用ＦＭシンセサイザー部６の設定と同じ設定に、さらに調整つまみ３２を１箇所操作したときの設定により生成される。
　このとき、調整操作ユニット３は、４つのオシレータ６１およびオシレータ７１の前段に設けられている４つの入力側増幅器６４Ａおよび入力側増幅器７３Ａを操作する状態になっている。これらの１６箇所のパラメータを、調整操作ユニット３の１６個の調整操作つまみ３２により調整することができる。 Here, the synthesized sound signals generated by the sound signal generation units OP1 ′ to OP4 ′ are different from the sound signals generated by the same settings as those of the sound synthesis FM synthesizer unit 6, and are different from the sound signals generated by the sound generation FM synthesizer unit 6. The same setting as that of the synthesizer unit 6 is generated by further setting when the adjustment knob 32 is operated by one position.
At this time, the adjustment operation unit 3 is in a state of operating the four input- side amplifiers 64A and 73A provided before the four oscillators 61 and 71. These 16 parameters can be adjusted by the 16 adjustment operation knobs 32 of the adjustment operation unit 3.
　操作者がある１つの調整つまみ３２を操作すると、その操作に加えて、さらに、調整つまみ３２のうちの１つを所定の位置に操作したときに、音響信号生成部ＯＰ１’から音響信号生成部ＯＰ４’は、調整つまみ３２の操作位置に応じた合成音響信号を生成する。
　限界量判定部７５４は、この合成音響信号を分析し、限界量に達しているか否かを判定する。
　限界量判定部７５４により判定されたそれぞれの調整つまみ３２の調整操作量の限界量は、限界量報知部７６に出力される。 When the operator operates one adjustment knob 32, in addition to the operation, when one of the adjustment knobs 32 is operated to a predetermined position, the sound signal generation unit OP1 'switches the sound signal generation unit OP4 ′ generates a synthetic sound signal corresponding to the operation position of the adjustment knob 32.
The limit amount determination unit 754 analyzes the synthesized 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.
　限界量報知部７６は、制御信号出力部７６１および報知状態記憶部７６２を備える。
　制御信号出力部７６１は、限界量判定部７５４から出力された調整操作量の限界量に基づいて、点灯制御信号を生成して、調整操作ユニット３のそれぞれの調整つまみ３２のＬＥＤ発光部３２７に出力する。具体的には、制御信号出力部７６１は、調整つまみ３２の調整操作量が、限界量以下である場合には、ＬＥＤ発光部３２７に緑色で発光させる制御信号を出力する。 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 outputs the lighting control signal to the LED light emitting unit 327 of each adjustment knob 32 of the adjustment operation unit 3. Output. Specifically, when the adjustment operation amount of the adjustment knob 32 is equal to or less than the limit amount, the control signal output unit 761 outputs a control signal for causing the LED light emitting unit 327 to emit green light.
　また、制御信号出力部７６１は、調整つまみ３２の調整操作量が、限界量を超えている場合には、ＬＥＤ発光部３２７に赤色で発光させる制御信号を出力する。
　なお、ＬＥＤ発光部３２７の発光色は２色に限られず、限界量よりも十分に調整操作量が少ない場合は緑色、限界量に近くなった場合は黄色、限界量を超えたら赤色のように多段階で表示するように構成してもよい。 The control signal output unit 761 outputs a control signal for causing the LED light emitting unit 327 to emit red light when the adjustment operation amount of the adjustment knob 32 exceeds the limit amount.
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 operation amount is close to the limit amount, and red when the operation amount exceeds the limit amount. You may comprise so that it may display on multiple stages.
　報知状態記憶部７６２は、メモリ等の記録媒体の記憶領域の一部として構成される。報知状態記憶部７６２には、限界量判定部７５４によって判定された調整つまみ３２の調整操作量の限界量が記憶される。限界量判定部７５４は、それぞれの調整つまみ３２の調整操作量の限界量が演算されたら、前回の限界量を新たな調整操作量の限界量に書き換える。 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 a new limit amount of the adjustment operation amount.
　ノイズ成分分析部８は、分析用ＦＭシンセサイザー部７から出力された合成音響信号に基づいて、合成音響信号に含まれるノイズ成分を分析する。ノイズ成分分析部８は、図９に示すように、テスト用キーノート取得部８１、ノイズ信号検出部８２、ノイズ成分蓄積部８３、および異種音階設定部８４を備える。
　テスト用キーノート取得部８１は、信号強度推定部７５のテスト用キーノート出力部７５１から出力されたテスト用キーノートTNOTEを取得する。 The noise component analysis unit 8 analyzes a noise component included in the synthesized audio signal based on the synthesized audio signal output from the analysis FM synthesizer unit 7. As shown in FIG. 9, the noise component analysis unit 8 includes a test key note acquisition unit 81, a noise signal detection unit 82, a noise component storage unit 83, and a different scale setting unit 84.
The test key note obtaining section 81 obtains the test key note TNOTE output from the test key note output section 751 of the signal strength estimating section 75.
　ノイズ信号検出部８２は、合成音響信号検出部７５２から検出された合成音響信号の周波数に応じた信号強度の分布を検出する。ノイズ信号検出部８２は、取得されたテスト用キーノートTNOTEに応じた周波数を基本周波数とした基音と倍音（整数以外の周波数比の設定の場合にはテスト用キーノートTNOTEに応じた周波数に周波数比を乗じた周波数を基本周波数とした基音と倍音）以外の周波数に生じた信号強度のピークをノイズ成分として検出する。たとえば、図１０に示すように、ノイズ信号検出部８２は、テスト用キーノートTNOTEに応じた周波数f_in’を基本周波数として、基音、第２倍音、第３倍音以外の信号強度のピークＮ１からピークＮ４をノイズ成分として検出する。
　ノイズ成分蓄積部８３は、ノイズ信号検出部８２により検出されたノイズ成分を、テスト用キーノートTNOTEに応じたノイズ成分としてメモリ等の記憶領域に蓄積する。 The noise signal detection unit 82 detects a distribution of signal strength corresponding to the frequency of the synthesized audio signal detected by the synthesized audio signal detection unit 752. The noise signal detection unit 82 calculates the fundamental frequency and the overtone whose fundamental frequency is the frequency corresponding to the acquired test keynote TNOTE (if the frequency ratio is set to a value other than an integer, the frequency is changed to the frequency corresponding to the test keynote TNOTE. The signal strength peaks occurring at frequencies other than the fundamental tone and the overtones whose fundamental frequency is the frequency multiplied by the ratio are detected as noise components. For example, as shown in FIG. 10, the noise signal detecting unit 82 uses the frequency f_in ′ corresponding to the test keynote TNOTE as a basic frequency and sets a peak from the peak N1 of the signal intensity other than the fundamental tone, the second harmonic, and the third harmonic. N4 is detected as a noise component.
The noise component storage unit 83 stores the noise component detected by the noise signal detection unit 82 as a noise component corresponding to the test keynote TNOTE in a storage area such as a memory.
　異種音階設定部８４は、操作者の操作に応じた基本周波数の音響信号とは異なる周波数の音響信号を設定する。異種音階設定部８４により設定された異なる周波数の信号強度のピークは、前述したノイズ信号検出部８２における検出対象となるノイズ成分とは見なされず、テスト用キーノートTNOTEに応じた周波数f_in’を基本周波数とした基音と倍音（整数以外の周波数比の設定の場合にはテスト用キーノートTNOTEに応じた周波数finに周波数比を乗じた周波数を基本周波数とした基音と倍音）と同様に扱われる。具体的には、異種音階設定部８４により異種音階としてコード”Ｃ”が設定された場合、操作者がＭＩＤＩキーボード４の”ド”を打鍵したときに、同様に”ミ”、”ソ”がノイズ成分として見なされなくなり、ノイズ信号検出部８２の検出対象から除外される。
　これにより、操作者がＭＩＤＩキーボード４の１音を打鍵しても、出力される音響信号は和音とすることができるため、聴き触りがよい和音を演奏できる。 The different scale setting unit 84 sets an acoustic signal having a frequency different from the fundamental frequency acoustic signal according to the operation of the operator. The signal strength peaks of different frequencies set by the different scale setting unit 84 are not regarded as noise components to be detected by the noise signal detecting unit 82 described above, and are based on the frequency f_in ′ according to the test keynote TNOTE. It is treated in the same manner as the fundamental tone and the overtone as the frequency (in the case of setting a frequency ratio other than an integer, the fundamental tone and the overtone whose fundamental frequency is the frequency obtained by multiplying the frequency ratio by the frequency fin corresponding to the test keynote TNOTE). Specifically, when the code “C” is set as a different scale by the different scale setting unit 84, similarly, when the operator taps “D” on the MIDI keyboard 4, “Mi” and “G” are similarly changed. The noise signal is no longer regarded as a noise component, and is excluded from detection targets of the noise signal detection unit 82.
Thus, even if the operator taps one sound of the MIDI keyboard 4, the output acoustic signal can be a chord, so that the chord can be played with good touch.
　ノイズリダクション部９は、出音用ＦＭシンセサイザー部６から出力された合成音響信号中に含まれるノイズ成分を減衰または消去して、ＭＩＤＩキーボード４から入力されたキーノートKNOTEに応じた周波数を基本周波数とした基音と倍音（整数以外の周波数比の設定の場合にはテスト用キーノートTNOTEに応じた周波数に周波数比を乗じた周波数を基本周波数とした基音と倍音）の合成音響信号を出力する。ノイズリダクション部９は、入力キーノート判定部９１およびノイズ信号削減部９２を備える。
　入力キーノート判定部９１は、操作者がＭＩＤＩキーボード４を操作して入力されたキーノートKNOTEを判定し、ノイズ成分蓄積部８３に蓄積されたテスト用キーノートと照合し、テスト用キーノートに応じた周波数を基本周波数として、基音、第２倍音、および第３倍音以外の信号強度のピークＮ１からピークＮ４のノイズ成分を読み出す。入力キーノート判定部９１は、読み出されたノイズ成分をノイズ信号削減部９２に出力する。 The noise reduction unit 9 attenuates or eliminates a noise component included in the synthetic sound signal output from the FM synthesizer unit 6 for outputting sound, and sets a frequency corresponding to the keynote KNOTE input from the MIDI keyboard 4 to a fundamental frequency. A synthesized sound signal of a fundamental tone and an overtone (in the case of setting a frequency ratio other than an integer, a fundamental tone and an overtone whose fundamental frequency is a frequency obtained by multiplying the frequency according to the test keynote TNOTE by the frequency ratio) is output. The noise reduction unit 9 includes an input key note determination unit 91 and a noise signal reduction unit 92.
The input key note determination unit 91 determines the key note KNOTE input by the operator operating the MIDI keyboard 4, compares the key note KNOTE with the test key note stored in the noise component storage unit 83, and determines the key note KNOTE as the test key note. With the corresponding frequency as a basic frequency, noise components of signal strengths other than the fundamental tone, the second overtone, and the third overtone from peak N1 to peak N4 are read. The input key note determination section 91 outputs the read noise component to the noise signal reduction section 92.
　ノイズ信号削減部９２は、出音用ＦＭシンセサイザー部６で生成された合成音響信号からノイズ成分を減衰または消去する。具体的には、図１１に示すように、入力キーノート判定部９１で照合されたキーノートKNOTEに応じたノイズ帯域における信号強度のピークＮ１からピークＮ４を減衰する。ノイズ帯域の信号強度のピークの減衰には、たとえば、ノッチフィルタによるフィルター処理を採用することができる。 The noise signal reduction unit 92 attenuates or eliminates a noise component from the synthetic sound signal generated by the sound synthesizer unit 6. Specifically, as shown in FIG. 11, the signal intensity peaks N1 to N4 in the noise band corresponding to the keynote KNOTE collated by the input keynote determination unit 91 are attenuated. To attenuate the peak of the signal strength in the noise band, for example, filter processing by a notch filter can be adopted.
　次に、本実施の形態の作用を図１２に示すフローチャートに基づいて説明する。
　信号強度推定部７５の操作量変更部７５３は、調整操作ユニット３のそれぞれの調整つまみ３２の調整操作量を読み込む（手順Ｓ１）。
　信号強度推定部７５のテスト用キーノート出力部７５１は、テスト用キーノートTNOTEを音響信号生成部ＯＰ１’から音響信号生成部ＯＰ４’に出力し（手順Ｓ２）、合成音響信号を生成する（手順Ｓ３）。
　テスト用キーノート取得部８１は、テスト用キーノート出力部７５１から出力されたテスト用キーノートTNOTEを取得する（手順Ｓ４）。 Next, the operation of the present embodiment will be described based on the flowchart shown in FIG.
The operation amount changing unit 753 of the signal strength estimation unit 75 reads the adjustment operation amount of each adjustment knob 32 of the adjustment operation unit 3 (step S1).
The test key note output unit 751 of the signal strength estimating unit 75 outputs the test key note TNOTE from the audio signal generation unit OP1 'to the audio signal generation unit OP4' (step S2), and generates a synthetic audio signal (step S2). S3).
The test key note obtaining unit 81 obtains the test key note TNOTE output from the test key note output unit 751 (step S4).
　合成音響信号検出部７５２は、入力側加算器７３Ｂによって加算された合成音響信号を、テスト用キーノートTNOTEに応じた周波数を基本周波数として、合成音響信号の信号強度を検出する（手順Ｓ５）。
　ノイズ信号検出部８２は、合成音響信号検出部７５２により検出された合成音響信号に含まれる、テスト用キーノートTNOTEに応じた周波数を基本周波数とした基音と倍音の周波数（整数以外の周波数比の設定の場合にはテスト用キーノートTNOTEに応じた周波数に周波数比を乗じた周波数を基本周波数とした基音と倍音の周波数）、および異種音階設定部８４により設定された音階の周波数以外の合成音響信号中のノイズ信号を検出する（手順Ｓ６）。 The synthetic sound signal detection unit 752 detects the signal strength of the synthetic sound signal using the synthetic sound signal added by the input side adder 73B as a basic frequency having a frequency corresponding to the test keynote TNOTE (step S5).
The noise signal detection unit 82 includes a fundamental sound having a frequency corresponding to the test keynote TNOTE and a frequency of a harmonic (a frequency ratio other than an integer) included in the synthesized sound signal detected by the synthesized sound signal detection unit 752. In the case of the setting, the fundamental sound and the overtone whose basic frequency is the frequency obtained by multiplying the frequency according to the test keynote TNOTE by the frequency ratio) and the synthetic sound other than the frequency of the scale set by the different scale setting unit 84 A noise signal in the signal is detected (step S6).
　ノイズ信号検出部８２は、すべてのテスト用キーノートTNOTEについてノイズ信号の検出が終了したか否かを判定する（手順Ｓ７）。
　終了していない場合、テスト用キーノートTNOTEを変更して、手順Ｓ２以下を繰り返す。
　終了した場合、ノイズ成分蓄積部８３は、それぞれのテスト用キーノートTNOTEについてノイズ成分を記憶領域に蓄積する（手順Ｓ８）。 The noise signal detection unit 82 determines whether the detection of the noise signal has been completed for all the test keynotes TNOTE (step S7).
If not finished, the test key note TNOTE is changed, and the procedure from step S2 is repeated.
When the test is completed, the noise component accumulation unit 83 accumulates a noise component for each test keynote TNOTE in the storage area (step S8).
　入力キーノート判定部９１は、操作者がＭＩＤＩキーボード４を打鍵して出力された入力されたキーノートKNOTEと、ノイズ成分蓄積部８３により蓄積されたテスト用キーノートTNOTEとの照合を行う（手順Ｓ９）。次に、入力キーノート判定部９１は、入力されたキーノートKNOTEに応じたノイズ成分の信号強度のピークＮ１からピークＮ４を読み出す（手順Ｓ１０）。
　ノイズ信号削減部９２は、出音用ＦＭシンセサイザー部６から出力された合成音響信号のノイズ帯域における信号強度のピークＮ１からピークＮ４を減衰または消去する（手順Ｓ１１）。
　ＦＭシンセサイザー１は、入力されたキーノートKNOTEに応じた周波数を基本周波数とした基音と倍音（整数以外の周波数比の設定の場合にはテスト用キーノートTNOTEに応じた周波数に周波数比を乗じた周波数を基本周波数とした基音と倍音）、および異種音階設定部８４で設定された音階の合成音響信号を出力して、音声を出力する（手順Ｓ１２）。 The input key note determination unit 91 collates the input key note KNOTE output by tapping the MIDI keyboard 4 by the operator with the test key note TNOTE stored by the noise component storage unit 83 (procedure). S9). Next, the input key note determination section 91 reads out the peaks N1 to N4 of the signal intensity of the noise component corresponding to the input key note KNOTE (step S10).
The noise signal reduction unit 92 attenuates or eliminates the signal strength peaks N1 to N4 in the noise band of the synthesized sound signal output from the sound synthesizer unit 6 (step S11).
The FM synthesizer 1 has a fundamental frequency and a fundamental frequency based on the frequency according to the input keynote KNOTE (in the case of setting a frequency ratio other than an integer, the frequency according to the test keynote TNOTE is multiplied by the frequency ratio). A fundamental sound with a fundamental frequency as a fundamental frequency and a harmonic sound) and a synthetic sound signal of the scale set by the different scale setting unit 84 are output, and a sound is output (step S12).
　このような本実施の形態によれば、以下のような効果がある。
　本実施の形態では、ノイズ信号検出部８２は操作者のＭＩＤＩキーボード４の操作によるキーノートKNOTEに応じた周波数を基本周波数とした基音と倍音（整数以外の周波数比の設定の場合にはテスト用キーノートTNOTEに応じた周波数に周波数比を乗じた周波数を基本周波数とした基音と倍音）以外のノイズ信号の信号強度のピークＮ１からピークＮ４を検出している。そして、ノイズ信号削減部９２は、検出されたノイズ信号の信号強度のピークＮ１からピークＮ４を減衰または消去している。したがって、ＦＭシンセサイザー１は、操作者によるＭＩＤＩキーボード４の打鍵位置に応じた音階の音響信号を出力することができるため、設定の難しいＦＭシンセサイザー１から出力される音響信号に破綻を生じさせることなく、打鍵したキーノートKNOTEに応じた音声を出力することができる。 According to the present embodiment, the following effects can be obtained.
In the present embodiment, the noise signal detection unit 82 is a base tone and a harmonic that have a frequency corresponding to the keynote KNOTE obtained by operating the MIDI keyboard 4 by the operator as a fundamental frequency. The peaks N1 to N4 of the signal strength of the noise signal other than the fundamental tone and the overtone whose fundamental frequency is the frequency obtained by multiplying the frequency according to the keynote TNOTE by the frequency ratio are detected. Then, the noise signal reduction unit 92 attenuates or eliminates the peak N1 to the peak N4 of the signal strength of the detected noise signal. Therefore, the FM synthesizer 1 can output a sound signal of a scale corresponding to a key-pressing position of the MIDI keyboard 4 by the operator, so that the sound signal output from the FM synthesizer 1, which is difficult to set, does not break down. , Can output a sound corresponding to the keynote KNOTE.
　本実施の形態では、ＦＭシンセサイザー１にノイズ信号検出部８２、ノイズ成分蓄積部８３、入力キーノート判定部９１、およびノイズ信号削減部９２を採用している。ＦＭシンセサイザー１の場合、オシレータ６１で生成した搬送波を入力される変調波で変調しているため、ノイズ成分がある特定の周波数帯域に生じるものではなく、任意の周波数でノイズ信号の信号強度のピークが生じ得る。したがって、本実施の形態のノイズリダクション部９であれば、任意の周波数におけるノイズ成分であってもノイズ成分の減衰または消去を行うことができるため、ＦＭシンセサイザー１に好適である。 In the present embodiment, the FM synthesizer 1 employs the noise signal detection unit 82, the noise component storage unit 83, the input key note determination unit 91, and the noise signal reduction unit 92. In the case of the FM synthesizer 1, since the carrier generated by the oscillator 61 is modulated by the input modulation wave, the noise component does not occur in a specific frequency band, and the peak of the signal intensity of the noise signal at an arbitrary frequency is not generated. Can occur. Therefore, the noise reduction unit 9 of the present embodiment is suitable for the FM synthesizer 1 because the noise component can be attenuated or eliminated even if the noise component is at an arbitrary frequency.
　本発明は、前述した実施の形態に限定されるものではなく、以下に示すような変形をも含む。
　前述した実施の形態では、ＦＭシンセサイザー１に本発明を適用していたが、本発明はこれに限られない。すなわち、電子ピアノや電子オルガン、エレキギター、電子木管楽器等の電子楽器に前述したノイズリダクション部９を適用して、ノイズ成分の減衰、消去を行ってもよい。 The present invention is not limited to the above-described embodiment, but includes the following modifications.
In the above-described embodiment, the present invention is applied to the FM synthesizer 1, but the present invention is not limited to this. That is, the noise reduction unit 9 described above may be applied to an electronic musical instrument such as an electronic piano, an electronic organ, an electric guitar, and an electronic woodwind instrument to attenuate and eliminate noise components.
　前述の実施の形態では、音響信号生成部ＯＰ１から音響信号生成部ＯＰ４、および音響信号生成部ＯＰ１’から音響信号生成部ＯＰ４’をＤＳＰで構成していたが、本発明はこれに限られない。すべての構成をコンピュータ読み取り可能なノイズ削減プログラムとして構成してもよい。
　その他、本発明は、本発明の目的を達成できる範囲で他の構造および構成に適用してもよい。 In the above-described embodiment, the audio signal generators OP1 to OP4 and the audio signal generators OP1 ′ to OP4 ′ are configured by the DSP, but the present invention is not limited to this. . All configurations may be configured as a computer-readable noise reduction program.
In addition, the present invention may be applied to other structures and configurations as long as the object of the present invention can be achieved.
　１…多入力、１…ＦＭシンセサイザー、２…シンセサイザー本体、３…調整操作ユニット、４…ＭＩＤＩキーボード、５…パラメータ選択部、６…出音用ＦＭシンセサイザー部、７…分析用ＦＭシンセサイザー部、８…ノイズ成分分析部、９…ノイズリダクション部、３１…ケース、６１…オシレータ、６２…増幅器、６２Ａ…出力側増幅器、６３…信号出力部、６３Ａ…出力側増幅器、６４…変調波入力部、６４Ａ…入力側増幅器、６４Ｂ…入力側加算器、６５…音響信号合成部、６６…加算器、６７…フィルター部、７０…増幅器、７１…オシレータ、７２…信号出力部、７２Ａ…出力側増幅器、７３…搬送信号入力部、７３Ａ…入力側増幅器、７３Ｂ…入力側加算器、７４…加算器、７５…信号強度推定部、７６…限界量報知部、８１…テスト用キーノート取得部、８２…ノイズ信号検出部、８３…ノイズ成分蓄積部、８４…異種音階設定部、９１…入力キーノート判定部、９２…ノイズ信号削減部、３２１…本体、３２２…調整位置表示マーカー、３２３…基部、３２４…回転軸、３２５…回路基板、３２６…回転抵抗器、３２７…ＬＥＤ発光部、７５１…テスト用キーノート出力部、７５２…合成音響信号検出部、７５３…操作量変更部、７５４…限界量判定部、７５５…選択部、７６１…制御信号出力部、７６２…報知状態記憶部、KNOTE…キーノート、Ｎ１…ピーク、Ｎ４…ピーク、ＯＰ１…音響信号生成部、ＯＰ２…音響信号生成部、ＯＰ３…音響信号生成部、ＯＰ４…音響信号生成部、ＯＰ１’…音響信号生成部、ＯＰ２’…音響信号生成部、ＯＰ３’…音響信号生成部、ＯＰ４’…音響信号生成部、ＰＯ１…出力強度パターン、ＰＯ２…出力強度パターン、ＰＯ４…出力強度パターン、ＰＴ１…パターン、ＰＴ２…パターン、ＰＴ３…パターン、ＰＴ４…パターン、TNOTE…テスト用キーノート、Ｗ１…サイン波、Ｗ２…三角波、Ｗ３…ノコギリ波、Ｗ４…矩形波、f_in…基本周波数、f_in’…基本周波数。
  DESCRIPTION OF SYMBOLS 1 ... Multi-input, 1 ... FM synthesizer, 2 ... Synthesizer main body, 3 ... Adjustment operation unit, 4 ... MIDI keyboard, 5 ... Parameter selection part, 6 ... Sound synthesis FM synthesizer part, 7 ... Analysis FM synthesizer part, 8 ... Noise component analyzer, 9 noise reduction unit, 31 case, 61 oscillator, 62 amplifier, 62A output amplifier, 63 signal output unit, 63A output amplifier, 64 modulated wave input unit, 64A ... input side amplifier, 64B ... input side adder, 65 ... acoustic signal synthesis section, 66 ... adder, 67 ... filter section, 70 ... amplifier, 71 ... oscillator, 72 ... signal output section, 72A ... output side amplifier, 73 ... Carrier signal input unit, 73A ... Input side amplifier, 73B ... Input side adder, 74 ... Adder, 75 ... Signal strength estimation unit, 76 ... Limit amount notification unit, 81 Test key note acquisition section, 82: noise signal detection section, 83: noise component storage section, 84: different scale setting section, 91: input key note determination section, 92: noise signal reduction section, 321: main body, 322: adjustment Position display markers, 323: Base, 324: Rotating axis, 325: Circuit board, 326: Rotating resistor, 327: LED light emitting unit, 751: Test key note output unit, 752: Synthetic sound signal detecting 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, N1: peak, N4: peak, OP1: acoustic signal generation unit OP2: sound signal generation unit, OP3: sound signal generation unit, OP4: sound signal generation unit, OP1 ': sound signal generation unit, OP2': sound signal generation unit, OP3 ': sound signal generation unit , OP4 ': sound signal generation unit, PO1: output intensity pattern, PO2: 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: sawtooth wave, W4: rectangular wave, f_in: fundamental frequency, f_in ': fundamental frequency.

Claims (4)

  1. 　操作者の操作に応じた周波数の音響信号を出力する演奏装置であって、
    　前記操作者の操作に応じた音響信号の周波数以外のノイズ信号の信号強度を検出するノイズ信号検出部と、
    　前記ノイズ信号検出部により検出されたノイズ信号の信号強度を、減衰または消去するノイズ信号削減部と、を備える演奏装置。     A performance device that outputs an acoustic signal having a frequency according to an operation of an operator,
    A noise signal detection unit that detects the signal strength of a noise signal other than the frequency of the acoustic signal according to the operation of the operator,
    A performance device comprising: a noise signal reduction unit that attenuates or eliminates the signal strength of the noise signal detected by the noise signal detection unit.
  2. 　請求項１に記載の演奏装置において、
    　前記操作者の操作に応じた周波数の音響信号とは異なる周波数の音響信号を設定する異種音階設定部を備え、
    　前記ノイズ信号検出部は、前記異種音階設定部により設定された異なる周波数の音響信号を検出対象から除外する演奏装置。     The performance device according to claim 1,
    A different tone scale setting unit that sets an acoustic signal of a different frequency from an acoustic signal of a frequency according to the operation of the operator,
    The performance device, wherein the noise signal detection unit excludes acoustic signals of different frequencies set by the different scale setting unit from detection targets.
  3. 　請求項１または請求項２に記載の演奏装置において、
    　ＦＭ（Frequency Modulation）シンセサイザーである演奏装置。     The performance device according to claim 1 or 2,
    A performance device that is an FM (Frequency Modulation) synthesizer.
  4. 　コンピュータを請求項１または請求項２に記載の演奏装置として機能させるコンピュータ読み取り可能なノイズ削減プログラム。
          A computer-readable noise reduction program that causes a computer to function as the performance device according to claim 1.
PCT/JP2018/034855 2018-09-20 2018-09-20 Musical performance device and noise reducing program WO2020059085A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5546793A (en) * 1978-09-28 1980-04-02 Casio Computer Co Ltd Tone generator in electronic musical instrument
JPH04161994A (en) * 1990-10-25 1992-06-05 Casio Comput Co Ltd Musical sound generation device
JPH08321745A (en) * 1995-03-20 1996-12-03 Fujitsu Ltd Audio data processor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009004718A1 (en) 2007-07-03 2009-01-08 Pioneer Corporation Musical sound emphasizing device, musical sound emphasizing method, musical sound emphasizing program, and recording medium

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5546793A (en) * 1978-09-28 1980-04-02 Casio Computer Co Ltd Tone generator in electronic musical instrument
JPH04161994A (en) * 1990-10-25 1992-06-05 Casio Comput Co Ltd Musical sound generation device
JPH08321745A (en) * 1995-03-20 1996-12-03 Fujitsu Ltd Audio data processor

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