WO2008020515A1 - Appareil et procédé de génération d'harmoniques supérieurs - Google Patents
Appareil et procédé de génération d'harmoniques supérieurs Download PDFInfo
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- WO2008020515A1 WO2008020515A1 PCT/JP2007/063592 JP2007063592W WO2008020515A1 WO 2008020515 A1 WO2008020515 A1 WO 2008020515A1 JP 2007063592 W JP2007063592 W JP 2007063592W WO 2008020515 A1 WO2008020515 A1 WO 2008020515A1
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- signal
- overtone
- harmonic
- level
- correction
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Classifications
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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
- G10H1/00—Details of electrophonic musical instruments
- G10H1/02—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos
- G10H1/06—Circuits for establishing the harmonic content of tones, or other arrangements for changing the tone colour
- G10H1/14—Circuits for establishing the harmonic content of tones, or other arrangements for changing the tone colour during execution
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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
- G10H1/00—Details of electrophonic musical instruments
- G10H1/18—Selecting circuits
- G10H1/20—Selecting circuits for transposition
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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
- G10H2210/00—Aspects or methods of musical processing having intrinsic musical character, i.e. involving musical theory or musical parameters or relying on musical knowledge, as applied in electrophonic musical tools or instruments
- G10H2210/155—Musical effects
- G10H2210/311—Distortion, i.e. desired non-linear audio processing to change the tone color, e.g. by adding harmonics or deliberately distorting the amplitude of an audio waveform
Definitions
- the present invention relates to a harmonic generation device and a harmonic generation method.
- the compressed music signal which is similar to MP3 and WMA, cuts the high-frequency range that is difficult for the human ear to hear because the file size is reduced. For this reason, the sound recorded on the CD and the compressed sound have a problem that the sound quality deteriorates compared to the original sound. Therefore, a harmonic overtone generator has been proposed that generates the above-mentioned music signal power overtone and restores the lost high frequency range.
- Patent Document 1 describes a harmonic adding device that can separately generate even harmonics and odd harmonics of a music signal and control the balance between even harmonics and odd harmonics.
- the even harmonics are harmonics including frequency components that are even multiples of the frequency of the music signal, that is, 2, 4, 6, 8, 2n times (n is an integer).
- odd harmonics are harmonics containing frequency components that are odd multiples of the frequency of the music signal, that is, 3, 5, 7, 9 2 ( ⁇ + 1) times (n is an integer). is there.
- Patent Document 2 describes an acoustic signal processing device that generates an integral multiple of harmonics using a full-wave rectifier circuit. Each harmonic generator generates an overtone that is an integer multiple of the frequency of the music signal.
- Patent Document 1 JP-A-8-95567
- Patent Document 2 Japanese Patent Application Laid-Open No. 2004-101797
- overtones do not necessarily have to be an integral multiple of the frequency of the music signal.
- the sound quality of electronic instruments is often said to be “artificial” compared to natural instruments. this is because the harmonics contained in the sound of a natural musical instrument contain not only a small amount of harmonics but also a non-integer multiple, so that a music signal that has a harmonic power that is only an integral multiple of an electronic musical instrument has an unnatural feeling.
- the present inventor has proposed an odd-order overtone generation device that generates a harmonic signal including a non-integer multiple frequency component shifted back and forth with respect to an odd multiple frequency from a music signal (Japanese Patent Application 2006). — 93092).
- this odd-order overtone generator only the overtones with shifted odd-numbered frequency power can be obtained, and non-integer-times frequency components shifted back and forth with respect to the even-numbered frequency can be obtained. There was a problem that could not be done.
- an odd-order overtone generation device using an even-order harmonic generation device that generates a harmonic signal including a non-integer multiple frequency component shifted back and forth with respect to an even-numbered frequency from a music signal, I tried to add each harmonic generated by the even harmonic generator
- An object of the present invention is to solve a problem. That is, the present invention provides, for example, a harmonic generation device and a harmonic generation method that can obtain a non-integer multiple frequency component shifted back and forth from odd and even frequencies with a simple configuration. As!
- the invention according to claim 1 includes a harmonic generation device that generates harmonics of a music signal, and includes an odd multiple frequency component that deviates before and after a predetermined frequency based on the music signal.
- the invention according to claim 6 is a harmonic overtone generation method for generating overtones of a music signal.
- a step of generating a harmonic signal including a non-integer multiple frequency component shifted around a predetermined frequency from an odd multiple of the frequency of the music signal; and the harmonic signal generated by the first harmonic generation unit A harmonic generation method characterized by sequentially performing a step of generating harmonics of even multiple frequencies.
- FIG. 1 is a configuration diagram showing an example of a basic configuration of a harmonic overtone generating device according to the present invention.
- FIG. 2 is a block diagram showing an example of a first overtone generation unit shown in FIG.
- FIG. 3 is a block diagram showing an example of a first harmonic overtone generator shown in FIG.
- FIG. 4 is a block diagram showing an embodiment of a playback device incorporating a harmonic overtone generator according to the present invention.
- FIG. 5 is a block diagram showing a configuration of a DSP constituting the playback device shown in FIG.
- FIG. 6 (A) shows the frequency characteristics of the first harmonic signal generated from the first harmonic generation section, (B) shows the frequency characteristics of the first harmonic signal output by the second filter section, C) shows the frequency characteristics of the second harmonic signal, and (D) is a graph showing the frequency characteristics of the music signal obtained by adding the first harmonic signal and the second harmonic signal.
- FIG. 7 is a block diagram showing a detailed configuration of a first overtone generation unit shown in FIG.
- FIG. 8 (A) is the signal level of the music signal before the level correction by the first level correction unit, and (B) is the music signal after the level correction by the first level correction unit. (C) is a time chart showing the signal level of the first overtone signal generated by the level correction by the second level correction unit.
- FIG. 9 (A) and (B) are time charts of waveforms obtained by decomposing the first harmonic signal, respectively.
- FIG. 10 is a time chart showing the signal level of the second harmonic signal obtained by full-wave rectification of the first harmonic signal.
- FIG. 11 (A) and (B) are time charts of waveforms obtained by decomposing the second overtone signal, respectively.
- Second level correction unit (second level correction means)
- FIGS. 1 to 3 are configuration diagrams showing an example of the basic configuration of the harmonic overtone generating device according to the present invention.
- a harmonic generation device is a harmonic generation device that generates harmonics of a music signal. Based on the music signal, a signal including an odd multiple frequency component and a signal of a predetermined frequency A first overtone generation unit (first overtone generation means) for generating a non-integer multiple frequency component shifted from the odd frequency to the predetermined frequency before and after the first harmonic signal. ) 1 and a second overtone generation unit 2 (second overtone generation means) that generates a second overtone signal including the even frequency component based on the first overtone signal.
- first overtone generation unit for generating a non-integer multiple frequency component shifted from the odd frequency to the predetermined frequency before and after the first harmonic signal.
- second overtone generation unit 2 second overtone generation means
- the second overtone generation unit 2 generates the second overtone signal including the even frequency component based on the first overtone signal including the non-integer multiple frequency component, A second overtone signal is obtained that includes a frequency component that is a non-integer multiple that deviates around a predetermined frequency from an even multiple of the frequency component of the music signal. Therefore, it is sufficient if only the first harmonic generation unit 1 is configured to generate non-integer multiple frequency components. Both the first harmonic generation unit 1 and the second harmonic generation unit 2 have non-integer multiple frequencies. It is a simple configuration that does not require a configuration to generate components, and frequency components of non-integer multiples shifted back and forth from odd and even multiple frequencies. Obtainable. In addition, the shift amount for the odd-numbered frequency of the first harmonic signal and the shift amount for the even-numbered frequency of the second harmonic signal can be made the same.
- the harmonic generation device may further include an addition unit (adding means) 4 that adds both the first harmonic signal and the second harmonic signal to the music signal.
- the second overtone generator 2 may be composed of a full wave rectifier 21 for full wave rectification of the first overtone signal.
- the second overtone signal can be generated with a simple configuration using the full-wave rectification unit 21.
- the harmonic overtone generating device includes a harmonic overtone generating unit (1) in which the first overtone generating unit 1 suppresses a signal level exceeding a predetermined value of the music signal to a predetermined value and generates a harmonic component in the music signal ( Harmonic generation means) 11, a first level correction unit (first level correction means) 12 for generating a harmonic component by the harmonic generation means after performing level correction by multiplying the signal level of the music signal by a correction coefficient, A coefficient correction unit (coefficient correction means) 13 that corrects the correction coefficient so that the signal level of the music signal multiplied by the correction coefficient exceeds the specified value, and the signal level of the music signal that generated the harmonic component (1Z correction coefficient) ), And a second level correction unit (second level correction means) 14 for generating a first overtone signal by performing level correction.
- a harmonic overtone generating unit (1) in which the first overtone generating unit 1 suppresses a signal level exceeding a predetermined value of the music signal to a predetermined value and generates a harmonic component in the music
- the first harmonic overtone generating means 1 performs digital signal processing of the music signal!
- the signal level is larger than the maximum signal level that can be processed by the digital signal.
- Digital signal processing that suppresses the signal level to the maximum value when a level occurs
- a first level correction unit (first level correction unit) 12 that generates a harmonic component by multiplying a signal level of a music signal by a correction coefficient to generate a harmonic component, and a correction coefficient.
- a coefficient correction unit (coefficient correction means) 13 that corrects the correction coefficient so that the signal level of the multiplied music signal exceeds the maximum value, and (1Z correction coefficient) is multiplied by the signal level of the music signal that generated the harmonic component.
- a second level correction section (second level correction means) 14 for generating a first harmonic signal by performing level correction.
- the first harmonic signal can be multiplied by a signal corresponding to the variation frequency. For this reason, it is possible to generate a non-integer multiple frequency component that deviates from an odd multiple frequency around a fluctuating frequency (predetermined frequency). Even if the music signal has a small signal level, the signal level exceeds the predetermined value due to the level correction of the first level correction unit 12, so that the harmonic signal generation unit 11 reliably suppresses the signal level of the music signal. Overtones can be generated. That is, it is possible to reliably generate overtones even for a music signal of a small signal level.
- the harmonics can be generated by overflowing the digital signal processing device, the harmonics can be generated even if the digital signal processing device does not perform arithmetic processing or the like according to a non-linear function. Overtones can be generated by processing.
- the first level correction unit 12 includes a first correction coefficient multiplication unit (first correction coefficient multiplication unit) 12A that multiplies the signal level of the music signal by the first correction coefficient, and a first correction. And a second correction coefficient multiplier (second correction coefficient multiplication means) 12B for multiplying the signal level multiplied by the coefficient with a predetermined second correction coefficient, and the coefficient correction unit 13 multiplies the first correction coefficient.
- the first correction coefficient may be corrected so that the difference between the signal level and a predetermined target value divided by the second correction coefficient is obtained.
- the coefficient correction unit 13 corrects the first correction coefficient so that the signal level becomes smaller than the target value (target value Z second correction coefficient). For this reason, even if the target value is set to a value close to the maximum value, the signal level can be prevented from exceeding the maximum value when the signal level is multiplied by the first correction coefficient.
- the first correction coefficient can be corrected without being affected by the overflow of the digital signal processing apparatus.
- the overtone generation method generates overtones of a music signal. Based on the music signal, a first harmonic signal is generated by multiplying a signal containing an odd multiple of the frequency component by a signal having a predetermined frequency. Odd multiple frequency force in the sound signal. The step of generating a non-integer multiple frequency component shifted around the predetermined frequency, and the second overtone signal including the odd multiple frequency component based on the first overtone signal! Are sequentially performed.
- the second overtone signal including the even frequency component is generated based on the first overtone signal including the non-integer multiple frequency component!
- a second overtone signal containing a non-integer multiple frequency component deviated around the predetermined frequency from the frequency component is obtained. Therefore, it is sufficient to provide a configuration that generates a non-integer multiple frequency component only in the device that generates the first overtone signal. It is possible to obtain non-integer multiple frequency components that are shifted back and forth from the odd multiple and even multiple frequency components with a simple configuration that does not require a configuration that generates double frequency components. Moreover, the amount of deviation of the first harmonic signal with respect to the odd-numbered frequency and the amount of deviation of the second harmonic signal with respect to the even-numbered frequency can be made the same.
- FIG. 4 is a block diagram showing an example of the configuration of a music playback device incorporating a harmonic generation device and a digital signal processing device.
- This music playback apparatus processes, for example, a digital music signal recorded on a recording medium such as a DVD (Digital Versatile Disc), CD (Compact Disc), or hard disk (Hard Disk) into a signal that can be played back by a speaker. To do.
- the music playback apparatus 100 is connected to an output unit 200 that plays back the processed music information.
- the output unit 200 reproduces and outputs the music signal output from the music reproducing device 100.
- the output unit 200 includes a digital Z analog (DZA) conversion 210, an amplifier 220, and a speaker 230.
- the DZA converter 210 is connected to the music playback device 100 and converts a digital music signal output from the music playback device 100 into analog. Then, the D / A converter 210 outputs the music signal converted into analog to the amplifier 220.
- DZA digital Z analog
- the amplifier 220 is connected to the DZA converter 210 and to the speaker 230. It is. This amplifier 220 amplifies the analog music signal output from the DZA converter 210 and outputs it from the speaker 230.
- the music playback device 100 includes a DIR (Digital Interface Receiver) 101 to which a digital music signal read from the storage medium described above is input, and a decoder 102 that demodulates the compressed music signal.
- a DSP (Digital Signal Processor) 103 that performs various signal processing such as mixing processing and effect processing of the demodulated music signal, and a CPU 104 that controls the DSP 103 are also configured.
- the signal level of digital music signal is DSP1 max
- the signal level is an absolute value.
- the DSP 103 uses a program stored in a memory (not shown) to perform a first filter unit 5, a first harmonic generation unit 1, a first amplification unit 6, a full wave rectification unit 21, a second amplification unit 7, An adding unit 4A, a second filter unit 8, and a second adding unit 4B are provided.
- the first filter unit 5 extracts only a predetermined frequency band from the music signal.
- the first overtone generation unit 1 functions as a first overtone generation unit, and if the frequency of the music signal extracted by the first filter unit 5 is f, an odd number is generated based on the music signal as shown in FIG.
- a first overtone signal including a non-integer multiple frequency component shifted from the double frequency f, 3f, 5f...
- the first amplifying unit 6 amplifies the first overtone signal.
- the full-wave rectification unit 21 functions as a second overtone generation unit, and full-wave rectifies the first overtone signal before amplification to generate a second overtone signal including even frequency components.
- the first harmonic signal is full-wave rectified, as shown in FIG. 6 (B), the second harmonic including a non-integer multiple frequency component shifted from the even-numbered frequency 2f, 4f,. A signal is generated.
- the second amplifying unit 7 amplifies the second overtone signal.
- the first adder 4 ⁇ adds the first overtone signal and the second overtone signal.
- the second filter unit 8 The predetermined frequency band is removed from the signal obtained by adding the overtone signal and the second overtone signal, and only the overtone component is extracted.
- the second adding unit 4B adds the output signal of the second filter unit 8 shown in FIG. 6 (C) to the music signal, and as shown in FIG. A non-integer multiple frequency component shifted from the frequencies 2f, 3f, 4f,...
- the above-described first adder 4 ⁇ and second adder 4 ⁇ constitute an adder 4 as an adding means.
- the first overtone generation unit 1 includes a first level correction unit 12 as a first level correction unit that multiplies the signal level of the music signal by a correction coefficient 2W, and a music signal that has been multiplied by the correction coefficient 2W.
- It comprises a coefficient correction section 13 as correction means and a second level correction section 14 as second level correction means for multiplying the signal level of the music signal by (1Z correction coefficient 2W).
- an absolute value (hereinafter referred to as I x'W I) obtained by multiplying the signal level X by the first correction coefficient W is input to the coefficient correction unit 13.
- An absolute value section 15 for output is provided.
- the target value V is set higher than the maximum value X.
- the coefficient correction unit 13 described above includes a subtraction unit 13 A that subtracts the above I x′W
- from the above (VZ2), and a subtraction value e ( (V / 2) I xW I) and a correction unit 13B that corrects the first correction coefficient W by adaptive signal processing so as to approach the x′W force VZ2 based on the value a′e multiplied by ⁇ .
- W (n) is the first correction coefficient when the correction unit 13B performs (n-1) -th correction, and W is the first correction coefficient when the n-th correction is performed.
- the coefficient correction unit 13 makes ae negative when the I x 'WI is larger than (V / 2), and the first correction coefficient W becomes small. If I x 'WI is smaller than (V / 2), oc e becomes positive and the first correction coefficient W is corrected. Also, if the difference between I x 'WI and (VZ2) is large, the value of ae also increases, and the large ae is added to or subtracted from the first correction factor W, so that the difference between I x' WI and (VZ2) is small. Ae becomes smaller, and small! /, Ae is added to or subtracted from the first correction coefficient W.
- the coefficient correction unit 13 corrects the first correction coefficient W so that a value I x′W I obtained by multiplying the signal level X by the first correction coefficient W becomes VZ2.
- the first correction coefficient multiplier 12A performs level correction so that the signal level X of the music signal approaches VZ2
- the second correction coefficient multiplier 1 1B performs level correction so that the signal level X of the music signal approaches V. Is done.
- the first level correction unit 12 corrects the signal level X by multiplying the signal level X by the correction coefficient 2W so that the signal level X of the music signal shown in FIG. .
- the signal level X is multiplied by the correction coefficient 2W so that the signal level of the music signal repeats overshoot and undershoot with respect to the target value V as shown by the dotted line in FIG.
- the target value V is set larger than the maximum value X.
- the signal level exceeding max max is suppressed to the maximum value ⁇ . Therefore, the first level correction unit 12
- the second level correction unit 14 multiplies the signal level of the music signal shown in FIG. 8B by (1Z correction coefficient 2W) and the signal level is the level before the correction by the first level correction unit 12 is performed.
- the first harmonic signal in which the signal level is distorted and the harmonic component is generated is obtained.
- DSP 103 is equivalent to a harmonic generation means.
- the target value V is set to be larger than the maximum value X! If the signal level overshoots the target value V by the level correction of the bell correction unit 12 and exceeds the maximum value X, it may be set to a value smaller than the maximum value X. Ie max max
- the target value V is set so that the signal level of the music signal exceeds the maximum value X.
- the waveforms shown in FIGS. 9A and 9B can be obtained. That is, the first overtone signal can be expressed by multiplying the signal shown in FIG. 9A by the sine wave shown in FIG. 9B. It can be seen that when the signal shown in Fig. 4A is Fourier transformed, harmonics of odd multiples f, 3f, 5f ... of the original music signal frequency f are generated.
- the first harmonic signal in Fig. 8 (C) fluctuates slowly as shown by the two-dot chain line, and it can be seen that there is a low-frequency sine wave as shown in Fig. 9 (B). This is because the correction coefficient 2W fluctuates by the coefficient correction unit 13, and a signal corresponding to the fluctuation frequency (predetermined frequency) is multiplied by the first overtone signal.
- the signal shown in Fig. 9 (A) has frequency components of odd multiples f, 3f, 5f ... of the frequency f of the original music signal, and the sine wave shown in Fig. 9 (B) is a frequency component of the predetermined frequency ⁇ .
- the first harmonic signal shown in Fig. 8 (C) multiplied by the signal shown in Fig. 9 ( ⁇ ) and the sine wave shown in Fig. 9 ( ⁇ ) is (f + ⁇ ) as shown in Fig. 6 (A). ⁇ ( ⁇ — ⁇ ), (3 ⁇ + ⁇ ), (3 ⁇ - ⁇ ), (5f + Af), (5f— ⁇ )... That is, a first overtone signal including a non-integer multiple frequency component shifted from the odd multiple to about ⁇ is generated.
- the predetermined frequency ⁇ can be adjusted by the step size ⁇ of the correction unit 13B. That is, if the step size ⁇ is increased, the variation frequency of the correction coefficient 2 W increases and the predetermined frequency ⁇ increases. On the other hand, if the step size ⁇ is reduced, the fluctuation frequency force S of the correction coefficient 2W is reduced, and the predetermined frequency ⁇ is reduced.
- a second harmonic signal as shown in FIG. 10 is obtained.
- the waveform of the first harmonic signal shown in FIG. 10 is decomposed, the waveforms shown in FIGS. 11 (A) and 11 (B) can be obtained. That is, the second harmonic signal is It can be expressed by multiplication of the signal shown in A) and the sine wave shown in FIG. Fig. 11 (A) corresponds to the full-wave rectified waveform of the signal shown in Fig. 9 (A).
- FIG. 11B is the same sine wave as FIG. 9B.
- the signal shown in FIG. 11 (A) has 2f, 4f... Frequency components that are even multiples of the frequency f of the original music signal.
- the second overtone signal shown in FIG. 10 (C) obtained by multiplying the signal shown in FIG. 11 (A) by the sine wave shown in FIG. 11 (B) is (2f + A f) as shown in FIG. 6 (C). , (2f ⁇ A f), (4f + A f), (4f ⁇ A f), (6 ⁇ + ⁇ ⁇ ), (6f ⁇ ⁇ )... That is, a second overtone signal including a non-integer multiple frequency component shifted from the even multiple frequency around ⁇ is generated.
- a digital music signal whose strength is read such as a recording medium
- the decoder 102 demodulates the music signal compressed in the compression format such as ⁇ 3 or WMA, and supplies it to the DSP 103.
- the DSP 103 obtains a non-integer multiple frequency component shifted from the even multiple and odd multiple frequencies 2f, 3f, 4f...
- the music signal to which the overtone component is added is then subjected to various signal processing and then output to the DZA conversion 210.
- the DZA conversion 210 converts the digital music signal to which the harmonic component is added into analog, and then outputs the analog music signal to the speaker 230 via the amplifier 220. Then, the music signal to which the harmonic component is added is reproduced by the speaker 230.
- a first overtone signal is generated based on a music signal by multiplying a signal including an odd multiple of the frequency component by a signal of a predetermined frequency, and the first overtone.
- the first harmonic overtone generator 1 generates a non-integer multiple frequency component shifted around a predetermined frequency, and the second overtone signal containing an odd multiple frequency component based on the first overtone signal.
- a full-wave rectifying unit 21 to be generated That is, the full-wave rectification unit 21 as the second overtone generation means generates a second overtone signal including even frequency components based on the first overtone signal including non-integer multiple frequency components.
- a second overtone signal containing non-integer multiple frequency components deviated around ⁇ f from the even frequency components of the signal is obtained.
- the first harmonic generation unit 1 should be provided with a configuration for generating non-integer multiple frequency components.
- a simple configuration such as the rectifying unit 21, it is possible to obtain non-integer multiple frequency components that are shifted back and forth from the odd and even multiple frequencies.
- the amount of deviation ⁇ f for the odd-numbered frequency of the first harmonic signal and the amount of deviation ⁇ for the even-numbered frequency of the second harmonic signal can be made the same.
- a first harmonic signal is generated by multiplying a signal including an odd multiple of a frequency component by a signal of a predetermined frequency based on the music signal! Generating a non-integer multiple frequency component shifted from the odd frequency to about the predetermined frequency in the first harmonic signal, and a second frequency component including the odd frequency component based on the first harmonic signal.
- a step of generating a harmonic signal is sequentially performed. As a result, it is sufficient to provide a configuration that generates a non-integer multiple frequency component only in the first harmonic generation unit 1. It is possible to obtain non-integer multiple frequency components that are shifted back and forth with odd and even frequency forces.
- the shift amount ⁇ f for the odd-numbered frequency of the first harmonic signal and the shift amount ⁇ for the even-numbered frequency of the second harmonic signal can be made the same.
- the addition unit 4 that adds both the first harmonic signal and the second harmonic signal to the music signal, the frequency force of the odd multiple and the even multiple is also added to the music signal. It is possible to add non-integer multiple frequency components that are shifted to.
- the second overtone generating means is constituted by the full-wave rectifier 21 for full-wave rectifying the first overtone signal, so that the second overtone signal can be generated with a simple configuration. Can be generated.
- the correction coefficient 2W varies by the coefficient correction unit 13, and therefore, as shown in FIGS. 9A and 9B, a signal corresponding to the variation frequency is converted into the first harmonic signal. Multiplication is possible. For this reason, the irregularity shifted from the odd-numbered frequency around the fluctuation frequency (predetermined frequency). Several times the frequency component can be generated. Even for a music signal with a small signal level, the signal level is set to the maximum value X of DSP103 by the level correction of the first level correction unit 12.
- the harmonic generation unit 11 can surely suppress the signal level of the music signal and generate harmonics. That is, even a small signal level music signal can reliably generate overtones.
- DSP103 can overflow harmonics to generate harmonics, harmonics can be generated without requiring DSP103 to perform arithmetic processing according to a nonlinear function, and harmonics can be generated with little arithmetic processing. it can.
- the correction coefficient 2W that the first level correction unit 12 multiplies the signal level is divided into two times by the first correction coefficient multiplication unit 12A and the second correction coefficient multiplication unit 12B. Multiply. Then, the coefficient correction unit 13 corrects the first correction coefficient W so that a value ⁇ ⁇ W obtained by multiplying the signal level X by the first correction coefficient W is smaller than the target value V and becomes (V / 2). Yes. For example, when the first correction coefficient W is corrected by the coefficient correction unit 13 so that x′V becomes the target value V, the signal level exceeds the maximum value X when the signal level is multiplied by the first correction coefficient W. Therefore, the coefficient correction unit 13 sets max so that the difference between the maximum value and the target value V becomes 0.
- the correction coefficient Since the correction coefficient is corrected, the correction coefficient cannot be corrected so that the differential force between x'V and the target value V is obtained. However, in this embodiment, the target value V is set to the maximum value X.
- the signal level is the maximum value X when the signal level is multiplied by the first correction factor W.
- the coefficient correction unit 13 can correct the first correction coefficient W without being affected by the overflow of the DSP 103.
- the first filter unit 5 extracts only the predetermined frequency band of the music signal power. Then, after generating a harmonic component in the extracted music signal of the predetermined frequency band, the second filter unit 8 removes the predetermined frequency band to extract only the harmonic component, and finally, the second adding unit 4B The harmonic component is added to the original music signal. According to this, it is possible to obtain a music signal in which a predetermined frequency band can be heard particularly well among the frequency bands constituting the music signal. For example, if the predetermined frequency band is set to be in the vocal region, the music signal resonates with vocals, and if the predetermined frequency band is set to be in the low sound region, the music signals resonate with low sounds.
- music signals compressed in a compression format such as MP3 or WMA are used.
- the power that has generated overtones The present invention is not limited to this.
- the same effect can be obtained by generating overtones in a music signal that has been cut off from the high frequency range as recorded on a CD.
- the full-wave rectification unit 21 is used as the second overtone generation unit, but the present invention is not limited to this.
- the second overtone generating means any means that generates an overtone that is an odd multiple of the frequency of the input signal may be used. For example, a zero cross method or a power method may be used.
- the present invention is not limited to this.
- the first overtone generation means for example, based on a music signal! /, An odd order overtone generation unit that generates a harmonic overtone signal including an odd number of frequency components thereof, and this odd order overtone generation unit is an odd number.
- a music signal before generating a double frequency component, or a multiplication unit that multiplies a harmonic signal generated by an odd harmonic generation unit by a sine wave (signal) of a predetermined frequency may be used.
- Various odd-order overtone generators have been proposed, such as compressors and peak-hold circuits that distort waveforms and generate odd multiples.
- the adding unit 4 adds the first harmonic signal and the second harmonic signal, and then adds the added signal to the music signal. It is not limited to this.
- the adding unit 4 may add the first overtone signal and the second overtone signal to the music signal.
- the first overtone signal and the second overtone signal may be added separately to the music signal.
- the DSP 103 is overflowed to generate overtones, but the present invention is not limited to this.
- a program that causes the DSP 103 to perform a nonlinear function that suppresses a signal level exceeding a predetermined value to a predetermined value may be used to generate overtones.
- the predetermined value is set to the maximum value X.
- first level correction unit 12 If the first level correction unit 12 is set to a value smaller than max, and the signal level of the music signal is multiplied by a correction coefficient so that the signal level of the music signal exceeds a predetermined value, level correction is performed. Overtones can be generated by the nonlinear operation of the DSP 103.
- the first level correction unit 1 If the predetermined value is set to a value smaller than the maximum value X, the first level correction unit 1
- a correction coefficient multiplier that multiplies the signal level by the correction coefficient
- a coefficient correction section that corrects the correction coefficient so that the value obtained by multiplying the signal level by the correction factor and the target value V becomes zero. Do it.
- an analog compressor having an input / output characteristic that suppresses a signal level exceeding a predetermined value to a predetermined value may be used as the overtone generating means.
- the predetermined value is set to a value smaller than the maximum value X, and the music signal is sent to the first level correction unit 12 of the DSP 103.
- the signal level of the music signal is multiplied by a correction coefficient so that the signal level of the signal exceeds a predetermined value, and level correction is performed.
- the music signal that has been level-corrected by the first level correction unit 12 is DZA converted, converted to an analog music signal, and then supplied to the analog compressor, thereby generating overtones.
- the second correction coefficient multiplying unit 12B is multiplied by 2 as the second correction coefficient.
- the present invention is not limited to this.
- the target value VZ second correction factor is the maximum value X
- the force in which the first and second level correction units 12 and 14 are configured by the DSP 103 is not limited to this. You may comprise.
- the error e itself is used as the first level correction means as the evaluation value for bringing the signal level X close to the target value (VZ2). It is not limited to this.
- the correction coefficient W may be corrected using the square error e 2 as an evaluation value so that the square error e 2 becomes zero.
- the first level correction means may be any algorithm as long as it does not contradict the purpose of the present invention.
Description
Claims
Priority Applications (2)
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JP2008529832A JP4852612B2 (ja) | 2006-08-14 | 2007-07-06 | 倍音生成装置及び倍音生成方法 |
US12/377,528 US8022289B2 (en) | 2006-08-14 | 2007-07-06 | Harmonic sound generator and a method for producing harmonic sound |
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JP2006220914 | 2006-08-14 | ||
JP2006-220914 | 2006-08-14 |
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WO2008020515A1 true WO2008020515A1 (fr) | 2008-02-21 |
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PCT/JP2007/063592 WO2008020515A1 (fr) | 2006-08-14 | 2007-07-06 | Appareil et procédé de génération d'harmoniques supérieurs |
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US (1) | US8022289B2 (ja) |
JP (1) | JP4852612B2 (ja) |
WO (1) | WO2008020515A1 (ja) |
Cited By (1)
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WO2009116150A1 (ja) * | 2008-03-19 | 2009-09-24 | パイオニア株式会社 | 倍音生成装置、音響装置及び倍音生成方法 |
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US11617046B2 (en) * | 2021-07-02 | 2023-03-28 | Tenor Inc. | Audio signal reproduction |
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JPH0493998A (ja) * | 1990-08-07 | 1992-03-26 | Kawai Musical Instr Mfg Co Ltd | ディストーション装置 |
JPH04116598A (ja) * | 1990-09-07 | 1992-04-17 | Yamaha Corp | 楽音信号生成装置 |
JPH08328587A (ja) * | 1995-05-31 | 1996-12-13 | Sony Corp | 音響効果装置 |
JPH11119780A (ja) * | 1997-10-13 | 1999-04-30 | Kawai Musical Instr Mfg Co Ltd | 楽音合成装置 |
JP2001100752A (ja) * | 1999-09-30 | 2001-04-13 | Matsushita Electric Ind Co Ltd | 効果付加装置 |
JP2005318598A (ja) * | 2004-04-26 | 2005-11-10 | Phitek Systems Ltd | 信号処理におけるまたはそれに関する改善 |
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JP3462590B2 (ja) | 1994-09-21 | 2003-11-05 | 株式会社デノン | 倍音付加装置 |
JP4286510B2 (ja) | 2002-09-09 | 2009-07-01 | パナソニック株式会社 | 音響信号処理装置及びその方法 |
WO2005079312A2 (en) * | 2004-02-13 | 2005-09-01 | Bdmetrics Inc. | Automated system and method for determination and reporting of business development opportunities |
JP2006047451A (ja) * | 2004-08-02 | 2006-02-16 | Kawai Musical Instr Mfg Co Ltd | 電子楽器 |
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2007
- 2007-07-06 US US12/377,528 patent/US8022289B2/en not_active Expired - Fee Related
- 2007-07-06 WO PCT/JP2007/063592 patent/WO2008020515A1/ja active Application Filing
- 2007-07-06 JP JP2008529832A patent/JP4852612B2/ja not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0493998A (ja) * | 1990-08-07 | 1992-03-26 | Kawai Musical Instr Mfg Co Ltd | ディストーション装置 |
JPH04116598A (ja) * | 1990-09-07 | 1992-04-17 | Yamaha Corp | 楽音信号生成装置 |
JPH08328587A (ja) * | 1995-05-31 | 1996-12-13 | Sony Corp | 音響効果装置 |
JPH11119780A (ja) * | 1997-10-13 | 1999-04-30 | Kawai Musical Instr Mfg Co Ltd | 楽音合成装置 |
JP2001100752A (ja) * | 1999-09-30 | 2001-04-13 | Matsushita Electric Ind Co Ltd | 効果付加装置 |
JP2005318598A (ja) * | 2004-04-26 | 2005-11-10 | Phitek Systems Ltd | 信号処理におけるまたはそれに関する改善 |
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WO2009116150A1 (ja) * | 2008-03-19 | 2009-09-24 | パイオニア株式会社 | 倍音生成装置、音響装置及び倍音生成方法 |
JPWO2009116150A1 (ja) * | 2008-03-19 | 2011-07-21 | パイオニア株式会社 | 倍音生成装置、音響装置及び倍音生成方法 |
Also Published As
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US20100116122A1 (en) | 2010-05-13 |
US8022289B2 (en) | 2011-09-20 |
JPWO2008020515A1 (ja) | 2010-01-07 |
JP4852612B2 (ja) | 2012-01-11 |
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