JP4785053B2 - Resonant sound generator - Google Patents

Description

  The present invention relates to a resonance sound generating device, and more particularly, to a resonance sound generating device that simulates a string resonance sound that occurs when a damper pedal is operated on an acoustic piano.

  In an acoustic piano, the damper that holds the strings is removed from the strings with the damper pedal, and a performance technique is taken that resonates not only the strings actually played but all other strings. In an electronic musical instrument such as an electronic piano or an electronic organ, a function of simulating a string resonance sound by operating the damper pedal is required.

  For example, a normal piano sound that does not operate the damper pedal and a piano sound that includes the resonance sound when the damper pedal is operated are recorded, and each waveform data is stored, and the waveform is changed depending on whether or not the damper pedal is operated. A method of selecting and generating musical sounds has been done.

  Also, after recording the piano sound including the resonance sound when the damper pedal is operated, the resonance sound component is generated by removing only the piano overtone component from this piano sound, and this waveform data is stored, and the damper pedal operates. When this is done, a method of generating a resonance sound component together with a normal musical sound is also performed.

  Japanese Patent Application Laid-Open No. 09-127941 includes a resonance sound memory for storing waveform data of a musical sound obtained by removing a reference sound from a musical sound accompanied by a resonance sound based on a reference sound, and the resonance sound memory according to an instruction from a damper pedal. There has been proposed an electronic musical instrument that controls the amplitude of the waveform data read out from.

Furthermore, instead of generating musical sounds based on pre-stored waveform data, a digital signal processor (DSP) is used to form a resonance circuit, and only when the damper pedal is operated, resonance occurs through the resonance circuit. There is also a method of outputting a signal that forms a sound.
JP 09-127941 A

  For performance using a damper pedal, there are cases where the key is depressed after the damper pedal is operated, and cases where the damper pedal is operated after the key is depressed. When the damper pedal was operated after the key, there was a problem that sufficient resonance was not obtained.

  On the other hand, the inventors have made it possible to select from among a plurality of resonance sound waveforms according to the state of the damper pedal at the time of key depression, and the resonance sound sequence gate according to the amount of operation of the damper pedal. A method of generating resonance by changing the level has been proposed (Japanese Patent Application No. 2006-011470). Accordingly, it is possible to generate a resonance sound suitable for the case where the key is depressed after the damper pedal is operated and the case where the damper pedal is operated after the key is depressed.

  By the way, in the performance of an acoustic piano, when a damper pedal is operated and then pressed, and a loud resonance is generated, the damper pedal called a red damper is pressed again while the key is pressed and the damper pedal is returned once and operated again. The skill is known. When the damper pedal is re-operated by the redan damper, a small resonance sound is generated as in the case where the damper pedal is operated after the key is depressed.

  However, in the method according to the previous application, when the key is depressed after the damper pedal is operated and the key is depressed again, a large resonance sound is generated when the key is depressed, and a large resonance is again caused by the damper. There was a problem that sound was generated.

  In view of the above problems, an object of the present invention is to provide a resonance generator that can generate an appropriate resonance when an operation of re-pressing a damper pedal by a damper operation is performed during key depression. To do.

  In order to solve the above problems and achieve the object, the present invention includes a normal sound generating means for generating a normal sound in response to a sound generation instruction, and a first resonance sound of the normal sound in response to the sound generation instruction. In response to the sound generation instruction when a damper operation element is being operated, and a second resonance generating means for generating the second resonance of the normal sound. When the operation of the damper operation element is finished, a second resonance generation control means for canceling all the second resonance generated at that time, and the first resonance and the second Resonance sound mixing means for adding a resonance sound to form a mixed resonance sound, a level control means for controlling the output of the mixed resonance sound according to an operation of the damper operator, and the normal sound and the level are controlled. Music mixing to add the mixed resonance There is a first feature in that it includes a means.

  Further, according to the present invention, the level control means is a means for changing a multiplication coefficient from zero to a predetermined value in a first predetermined time when the damper operation element is turned on, and the damper operation element is turned off. Means for changing the multiplication coefficient from a predetermined value to zero at a second predetermined time different from the first predetermined time, and multiplying the output of the mixed resonance by the multiplication coefficient The second feature is that the output level is controlled.

  In the present invention, the level control means includes means for changing a multiplication coefficient in accordance with an operation amount of the damper operator, and outputs the mixed resonance sound by multiplying the output of the mixed resonance sound by the multiplication coefficient. There is a third feature in that the output level is controlled.

  In the present invention, the first resonance sound is a resonance sound when the damper operation element is operated after the sound generation instruction, and the sound generation is performed by adding the second resonance sound to the first resonance sound. A fourth feature is that a resonance sound is obtained when the damper operation element is operated prior to the instruction.

  Further, according to the present invention, the first resonance generating unit and the second resonance generating unit are configured such that the first resonance generation unit and the second resonance generation unit are based on the waveform storage unit storing waveform data and the waveform data read from the waveform storage unit. There is a fifth feature in that it includes sound source means for generating a resonance sound and a second resonance sound, respectively, and the waveform storage means has the first resonance sound generated from the harmonic component of the normal sound. And the waveform data of the second resonance generated from the non-periodic component of the normal sound are stored in a sixth feature.

  The seventh aspect of the present invention is that the second resonance generation control means is configured to generate the second resonance in response to a sound generation instruction for a preset sound or a normal sound in a range. There are features.

  In the present invention, the waveform data of the first resonance sound and the waveform data of the second resonance sound are transmitted to a circuit group in which a plurality of resonance circuits corresponding to harmonics of a normal sound that can be generated are connected in parallel. The eighth feature is that it is obtained by inputting.

  Furthermore, the present invention has a ninth feature in that the resonance circuit has a digital filter, and the impulse response of the resonance circuit is a one-degree-of-freedom viscous damping system model.

  According to the present invention having the first to ninth characteristics, when the damper operation element is operated, for example, when the keyboard is operated and a sound generation instruction is generated, the first resonance sound and the second resonance sound are generated as the resonance sounds. Both resonance sounds are pronounced. When the operation of the damper operation element is finished, all the second resonance sounds are muted. On the other hand, the second resonance sound is not muted and is generated by the level control means according to the operation amount of the damper operation element.

  In an acoustic piano, when the damper pedal is operated before the key is pressed, the resonance includes the non-periodic component and the harmonic component that are the impact sound of the key press. When this is done, the resonance sound due to the non-periodic component due to the impact sound of the key depression is attenuated. Such a change in the direct sound has an effect on the resonance sound. According to the present invention, it is possible to generate a high-accuracy resonance sound in consideration of this influence in accordance with the operation timing of the damper pedal. For example, when the damper is performed, the first resonance is not sounded again, but the second resonance is sounded again according to the amount of operation of the damper operator.

  In particular, according to the third feature, the level of the mixed resonance sound is precisely controlled in accordance with the operation amount of the damper operation element.

  Further, according to the present invention having the fourth feature, the first resonance sound is a resonance sound when the damper operation element is operated after the sound generation instruction, and in a situation where the damper operation element is operated before the sound generation instruction. The second resonance sound that is sounded in response to the sound generation instruction is added to the first resonance sound, but the second resonance sound is not sounded by the red damper, and is the same as when the damper operation element is operated after the sound generation instruction. Only the first resonance is added to the first resonance.

  In the present invention having the fifth and sixth features, the first resonance sound and the second resonance sound are obtained by inputting the waveform data of the first resonance sound and the second resonance sound read from the waveform storage means to the sound source means. Therefore, the second resonance sound can be easily muted only by stopping reading the waveform data of the second resonance sound from the waveform storage means to the sound source means.

  According to the seventh feature, the second resonance sound is generated only in response to a sound generation instruction for a normal sound in a preset sound or range. For example, a key press as a sounding instruction generated in a planned high sound or high sound range generates a strong impact sound. Therefore, in a situation where an aperiodic resonance sound corresponding to this shock sound is generated as a second resonance sound, The effect of eliminating the second resonance sound is great.

  According to the eighth feature, it is possible to easily obtain the resonance signal by inputting the tone signal to the resonance circuit.

  According to the ninth feature, by appropriately setting the parameters of the one-degree-of-freedom viscous damping system model, it is possible to reproduce a desired vibration waveform and generate a desired resonance sound.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 2 is a block diagram showing a hardware configuration of an electronic piano including a resonance generator according to an embodiment of the present invention. In the figure, a CPU 1 controls each part shown in the figure via a system bus 2. The ROM 3 has a program memory 3a for storing programs used in the CPU 1 and a data memory 3b for storing various data including at least timbre data. The RAM 4 temporarily stores various data generated in the control by the CPU 1.

  The electronic piano is provided with an operation panel (hereinafter simply referred to as “panel”) 5, a MIDI interface 6, and a damper pedal (hereinafter simply referred to as “pedal”) 7. The panel 5 is constituted by switches for setting various states including a tone color switch 5a for selecting a tone color of a musical tone to be generated. Information set from the panel 5 is supplied to the CPU 1. The pedal 7 includes a pedal sensor 7 a that detects an operation (depression) state of the pedal 7 and supplies the pedal information to the CPU 1. The pedal sensor 7a is a variable resistor, and detects a change in voltage caused by the variable resistance as a depression amount of the pedal 7. The detected depression amount data of the pedal 7 is sent to the CPU 1. When the depression amount data is input, the CPU 1 sets a resonance setting flag to “1” on the RAM 4. When the pedal 7 is no longer depressed, the depression amount is sent to the CPU 1 as “0”, and the resonance setting flag on the RAM 4 is set to “0”.

  The keyboard 8 is composed of 88 keys, and each key is provided with a key switch 8a composed of a touch sensor. The key switch 8a detects the operation of the keyboard 8 by the performer, and instructs the generation / mute timing of the musical tone corresponding to the key code KC indicating the pitch of the depressed key and the key depression / release. Key information such as key-on KON, key-off KOFF, and key touch KT corresponding to the key-pressing speed is output. Information output from the key switch 8 a is supplied to the CPU 1 via the system bus 2.

  The tone generator 9 is composed of a tone generator having channels that are time-division controlled to simultaneously generate a plurality of sounds, and accumulates and outputs the output signals of all the plurality of channels. In the musical sound generating unit 9, any channel is assigned by a key pressing operation, and a musical sound corresponding to the key pressing operation is generated in the channel.

  The waveform memory 10 stores waveform data of three types of musical tone information, the details of which will be described later, and the musical tone generator 9 reads out the waveform data stored in the waveform memory 10 and based on the waveform data, the musical tone is read out. Generate a signal. The musical tone generator 9 reads waveform data from the waveform memory 10 in response to the key operation. The read address is incremented at a speed corresponding to the key code KC. That is, the waveform data is read at a reading rate corresponding to the key code KC.

  The musical sound signal passes through the digital filter 11, is converted into an analog signal by the DA converter 12, and then is input to the sound system 13. The sound system 13 is composed of an amplifier, a speaker, and the like, and causes the output signal of the DA converter 12 to sound externally as an output of the electronic piano.

  The main function of the electronic piano will be described. In an acoustic piano, when a key is depressed by operating a damper pedal, a large resonance sound is generated due to an impact sound when the key is depressed. On the other hand, since the damper operates the damper pedal in a state where the key is already depressed, only the resonance sound due to the overtone component not including the resonance sound due to the impact sound at the time of the key depression is generated.

  Therefore, in the present embodiment, two types of musical sound information for generating resonance sounds are set according to the characteristics of such an acoustic piano. That is, the musical sound is generated based on the musical sound information of the direct sound (hereinafter referred to as “normal sound”) and two types of resonance information, that is, a total of three types of musical sound information. Normal sound generation system that generates normal sound by inputting waveform data of normal sound, and overtone resonance sound by inputting waveform data of only overtone components excluding non-periodic components that are impact sounds when pressing keys from normal sound And a second resonance sound generation system for generating a non-periodic resonance sound by inputting waveform data of only a non-periodic component.

  FIG. 1 is a block diagram showing the main functions of the electronic piano according to this embodiment. In FIG. 1, a normal sound generator 15, a harmonic resonance generator 16, and an aperiodic resonance generator 17 are provided as functions of a tone generator, that is, a sound source unit. The normal sound waveform storage unit 18, overtone resonance waveform storage unit (first resonance waveform storage unit) 19, and aperiodic resonance waveform storage unit (second resonance waveform storage unit) 20 are provided in the waveform memory 10. Normal tone waveform data, harmonic resonance waveform data, and aperiodic resonance waveform data are respectively stored. The normal sound generator 15 and the normal sound waveform storage unit 18 constitute a normal sound generator. The harmonic resonance generating unit 16 and the harmonic resonance sound waveform storage unit 19 constitute a first resonance generation unit, and the non-periodic resonance generation unit 17 and the non-periodic resonance waveform storage unit 20 constitute a second resonance generation unit. Configure. Of the resonance sound of an acoustic piano when the key is pressed after operating the damper pedal, the harmonic resonance component is the harmonic overtone component, and the acoustic piano resonance tone is the non-periodic resonance component. "

  The normal sound generator 15 generates a normal tone signal (hereinafter referred to as “normal tone signal”) based on the normal sound waveform data read from the normal sound waveform storage unit 18. The normal tone signal is input to the first adder 21. The overtone resonance generator 16 generates a tone signal of the overtone resonance sound (hereinafter referred to as “overtone resonance signal”) based on the overtone resonance waveform data read from the overtone resonance waveform storage unit 19. The non-periodic resonance sound generator 17 generates a musical signal of non-periodic resonance sound (hereinafter referred to as “non-periodic resonance signal”) based on the waveform data read from the non-periodic resonance sound waveform storage unit 20. The harmonic resonance signal and the non-periodic resonance signal are input to the second adder 22 as a resonance mixing unit.

  The second adder 22 synthesizes and outputs the harmonic resonance signal and the aperiodic resonance signal. The tone signal synthesized by the second adder 22 (hereinafter referred to as “synthetic resonance signal”) is level-changed by the multiplier 23 and input to the first adder 21. The first adder 21 adds and synthesizes the level-changed synthesized resonance signal and the normal tone signal and outputs the synthesized tone signal. The synthesized musical tone signal is input to the digital filter 11.

  The pedal state determination unit 24 determines the on / off state of the pedal sensor 7a when the keyboard sensor, that is, the key switch 8a is on, and sends a determination signal to the aperiodic resonance generation control unit (second resonance generation control means) 25. To enter. The non-periodic resonance generation control unit 25 controls the non-periodic resonance generation unit 17 according to the determination signal.

  The key-on KON of the key switch 8 a is input to the normal sound waveform storage unit 18, the harmonic resonance waveform storage unit 19, and the aperiodic resonance waveform storage unit 20.

  The level control unit 26 inputs a multiplication coefficient corresponding to the output of the pedal sensor 7 a to the multiplication unit 23. The multiplication coefficient is a value that changes from “0” to “1.0” corresponding to the depression amount of the pedal 7.

  The level control unit 26 is not limited to outputting a multiplication coefficient corresponding to the depression amount of the pedal 7, and the multiplication coefficient is changed from “0” to “1. The multiplication coefficient may be switched from “1.0” to “0” when the pedal 7 is no longer depressed (when the pedal is off).

  Further, the level control unit 26 changes the multiplication coefficient from “0” to “1.0” over a predetermined time when the pedal 7 is depressed, and when the pedal 7 is not depressed, The multiplication coefficient may be changed from “1.9” to “0” over a time different from the predetermined time.

  When the level control unit 26 switches between “1.0” and “0” in response to the on / off of the pedal 7 or changes the multiplication coefficient over a predetermined time, the level control unit 26 Instead of the detection signal from the pedal sensor 7a, the on / off state determination result of the pedal 7 is input to the unit 26 from the pedal state determination unit 24 (see the dotted arrow in FIG. 1).

  The normal sound waveform storage unit 18 stores in advance normal sound waveform data corresponding to all keys provided on the keyboard 8. The harmonic resonance waveform storage unit 19 and the non-periodic resonance waveform storage unit 20 store harmonic resonance waveforms corresponding to each normal sound based on the normal waveform data stored corresponding to all keys provided on the keyboard 8. Data and non-periodic resonance sound waveform data are stored in advance.

  Note that the aperiodic resonance may be generated only when a specific key or a key in a specific key range is turned on. For example, it is possible to generate a non-periodic resonance sound only in a high range where the level of the direct sound is large.

  In the above configuration, when the key switch 8a detects key-on, reading of the respective waveform data from the normal sound waveform storage unit 18 and the harmonic resonance waveform storage unit 19 to the normal sound generation unit 15 and the harmonic resonance sound generation unit 16 is started. Is done. If the pedal 7 is on when key-on is detected, readout of waveform data from the aperiodic resonance sound waveform storage unit 20 to the aperiodic resonance generation unit 17 is also started. The multiplication unit 23 changes the level of the synthesized resonance signal in accordance with the depression amount of the pedal 7. The level control unit 26 controls the multiplication coefficient of the multiplication unit 23 so that the level is reduced to the maximum value when the depression is large, and the level is reduced from the maximum value when the depression amount is small.

  When the operation of the pedal 7 is completed while the key is depressed (pedal switch off), the non-periodic resonance generation control unit 25 issues a stop command to the non-periodic resonance generation unit 17 to stop the output of the non-periodic resonance signal. In response to this stop command, reading of the aperiodic resonance sound waveform data into the aperiodic resonance generation unit 17 is stopped.

  On the other hand, since the reading of the harmonic resonance sound waveform data is not stopped, when the pedal 7 once turned off is turned back on, the multiplication coefficient input to the multiplication unit 23 increases from “0” and the harmonic resonance sound is increased. The signal is input to the first adder 21. Therefore, when the pedal 7 is depressed again by the red damper during the key depression, the aperiodic resonance sound remains muted, but the overtone resonance sound corresponds to the envelope that changes at the decay rate corresponding to the time from the key depression start. Start generating sound.

  FIG. 3 is a timing chart showing changes in the normal sound signal and the resonance sound signal. As shown in FIG. 3B, when the pedal 7 is depressed at the timing t1 and the pedal switch 7a is turned on, when the key switch 8a is turned on at the timing t2 (FIG. 3A). Each waveform data of the normal sound, the harmonic resonance sound, and the non-periodic resonance sound is read out (FIGS. 3C, 3D, and 3E). Based on these waveform data, a normal sound signal, a harmonic resonance signal, and an aperiodic resonance signal are output (FIGS. 3 (f), (g), and (h)). Further, the synthesized resonance signal of the harmonic resonance signal and the non-periodic resonance signal is output as shown in FIG. 3 (i), and the synthesized musical tone signal is output as shown in FIG. 3 (j).

  When the pedal 7 is turned off at timing t3, the output of the pedal switch 7a is turned off (FIG. 3 (b)). Then, the non-periodic resonance signal is stopped at timing t3 as shown in FIG. Although the output of the harmonic resonance signal is not stopped at the timing t3 as shown in FIG. 3 (g), the level is changed to the minimum by the multiplier 23 because the pedal switch 7a is turned off. It turns off at timing t3. After that, when the pedal 7 is depressed again at timing t4 and the pedal switch 7a is turned on, the harmonic resonance signal can be output, and only the harmonic resonance signal (FIG. 3 (g)) is output as the synthesized resonance signal. (FIG. 3 (i)).

  When the key switch 8a and the pedal switch 7a are turned off at the timing t5, the waveform data of the normal sound is attenuated by a predetermined attenuation envelope, and accordingly, the waveform data of the overtone resonance sound and the aperiodic resonance sound is also attenuated.

  As can be understood from this figure, if the pedal 7 was turned on before the key was pressed, a large synthesized resonance including a non-periodic resonance was generated when the key was pressed, and the pedal 7 was turned on during the key press. Sometimes, it is possible to generate a small synthetic resonance sound that does not include an aperiodic resonance sound due to a string striking impact sound when a key is pressed.

  FIG. 4 is a flowchart showing the entire process of the electronic piano. In step S1, the CPU 1, RAM 4, sound source LSI (DSP), etc. are initialized. In step S2, panel event processing is performed in which the state of the switch or the like of the panel 5 is read and corresponding processing is performed. In step S3, a keyboard event process for generating a normal tone signal based on the output of the key switch 8a is executed. The keyboard event process includes setting an envelope according to the key touch KT.

  In step S4, pedal event processing corresponding to the output of the pedal sensor 7a is performed. Note that the pedal event processing may include processing of pedals other than the pedal (damper pedal). In step S5, other processing is performed.

  FIG. 5 is a flowchart showing details of the keyboard event process (step S3). In step S30, the presence / absence of an on event of the keyboard 8, that is, the presence / absence of key depression is determined based on the presence / absence of key-on KON. If it is an on-event, the process proceeds to step S31, where normal sound waveform data is read from the normal sound waveform storage unit 18 according to the key information, and is input to the sound source LSI in the musical sound generating unit 9, and a normal sound signal is obtained based on this waveform data. Generate normal sound. In step S32, overtone resonance sound waveform data is read from the overtone resonance sound waveform storage unit 19 and input to the sound source LSI, and a harmonic resonance signal is generated based on the waveform data to generate a harmonic resonance.

  In step S33, it is determined whether or not the pedal 7 is turned on, that is, whether or not the output of the pedal sensor 7a is equal to or higher than the pedal-on reference value. If the pedal 7 is operated, the pedal is operated before the key is pressed. Therefore, the process proceeds to step S34, where the aperiodic resonance waveform data is read from the aperiodic resonance waveform storage unit 20 and input to the sound source LSI. An aperiodic resonance signal is generated based on the periodic resonance sound waveform data, and an aperiodic resonance is generated. If the pedal 7 is not turned on, step S33 is negative and step S34 is skipped and the process returns to the main flow.

  On the other hand, if it is not determined to be an on event in step S30, the process proceeds to step S35, and the presence or absence of an off event of the keyboard 8, that is, the presence or absence of key release, is determined based on the presence or absence of key-off KOFF. If it is an off event, the process proceeds to step S36 to determine whether or not the pedal 7 is operated. If the pedal 7 is turned on, the process returns to the main flow. In other words, since the mute process is not performed, the sound being sounded is maintained. If the pedal 7 is not turned on, the process proceeds to step S37, where the normal sound is silenced by being attenuated at a predetermined attenuation rate. Similarly, in step S38, the harmonic resonance sound is silenced, and in step S39, the non-periodic resonance sound is silenced.

  FIG. 6 is a flowchart showing details of the pedal event process (step S4). In step S40, it is determined whether or not the pedal 7 is turned on, that is, whether or not the output of the pedal sensor 7a has changed from zero. If the pedal 7 has been operated, the process proceeds to step S41, and a multiplication coefficient corresponding to the output value of the pedal sensor 7a is input to the multiplication unit 23 to increase the gate level of the resonance series.

  If the pedal 7 has not been turned on, the process proceeds to step S42 to determine whether the pedal 7 has been turned off, that is, whether the output of the pedal sensor 7a has been reduced to zero. If the pedal 7 is turned off, the multiplication coefficient is set to zero in step S43 and the gate level of the resonance series is reduced to zero. Subsequently, the process proceeds to step S44, and all the aperiodic resonance signals being sounded are silenced.

  If the pedal 7 is not turned off, the process proceeds from step S42 to step S45, and it is determined whether or not a pedal other than the pedal 7 has been operated. If step S45 is affirmative, a predetermined process corresponding to the operated other pedal is performed in step S46.

  Next, an example of creating waveform data of overtone resonance sound and aperiodic resonance sound will be described. FIG. 7 is a block diagram illustrating a configuration of a main part of the resonance generator. The resonance generating device includes n filter circuits that generate resonance frequencies corresponding to the frequencies of n harmonics constituting the musical sound of each pitch name for each pitch name. FIG. 7 shows portions corresponding to the pitch names A0 and B0. The resonance circuit 35 includes a filter FA0-1 that generates a resonance frequency corresponding to the fundamental tone of A0, and filters FA0-2 to FA0-n that generate resonance frequencies corresponding to n harmonics. Similarly, the resonance circuit 36 includes a filter FB0-1 that generates a resonance frequency corresponding to the fundamental tone of B0, and filters FB0-2 to FB0-n that generate resonance frequencies corresponding to n harmonics. Adders 37 and 38 synthesize the outputs of the resonance circuit 35 and the resonance circuit 36, respectively. Further, the adder 39 synthesizes outputs of resonance circuits (not shown) provided corresponding to all pitch names including the resonance circuits 35 and 36.

  It should be noted that the resonance sounds are preferably created corresponding to all the pitch names (that is, all the keys of the keyboard 8), but are not necessarily created corresponding to all the keys of the keyboard 8. For example, in an acoustic piano, the names of pitches that are braked by a damper pedal are 69 keys from A0 to F6. Since keys other than the 69 keys have little resonance effect, it is not necessary to create a resonance sound.

  Further, as described above, it is preferable that the generated non-periodic resonance sound waveform data is read in response to a sound generation instruction (key press) of a specific sound or a sound of a specific high range.

  In the configuration of FIG. 7, when creating the waveform data of the harmonic resonance, the harmonic component extracted from the recorded normal sound is used as the input data of the resonance generator. When creating waveform data of a non-periodic resonance sound, the non-periodic component extracted from the recorded normal sound is used as input data of the resonance sound generator.

  For example, when a harmonic component of a normal tone is input, each filter of the resonance circuit 35 outputs basic tone and resonance musical tone information in response to the input harmonic component. However, not only the resonance circuit 35 responds to the waveform data of the normal sound of A0, but other pitch names having the same resonance frequency as the fundamental tone and each harmonic frequency of A0 or a resonance frequency slightly deviated from them. The response filter also outputs resonance tone information in response. For example, resonance musical tone information is also output from a filter having a filter characteristic of the second overtone of A3 (441 Hz) that approximates the fundamental tone of A4 (440 Hz). The resonance musical tone information output from all the responding filters is synthesized by the adder 39, and the waveform data of the overtone resonance is output. This waveform data is stored in the waveform memory 10 in advance. Similarly, waveform data is also generated for non-periodic components and stored in the waveform memory 10 in advance.

  As each filter circuit of the resonance circuit, it is preferable to use an IIR filter, which is designed to have a characteristic in which an output sharply rises in response to each input frequency. That is, the impulse response of the filter simulates the vibration waveform of the harmonic component and the non-periodic component, and can be reproduced by a one-degree-of-freedom viscous damping system model. For a one-degree-of-freedom viscous damping system model, the mass coefficient, damping natural frequency, and damping factor are model parameters. Based on this, the viscosity coefficient and stiffness coefficient that are the coefficients of the equation of motion of the one-degree-of-freedom viscous damping system model are calculated. Ask. Further, the equation of motion is Laplace transformed to obtain a transfer function expression of s expression. Then, the viscosity coefficient, the stiffness coefficient, and the mass are substituted into this transfer function equation, and bilinear transformation is performed to obtain a filter coefficient in z expression.

  The mass is an arbitrary value, the damped natural frequency is the frequency of the harmonic to be simulated, and the attenuation factor is a filter coefficient as an index when the attenuation of the harmonic is approximated by an exponential function.

  One filter is designed to simulate temporal fluctuations of overtone components and non-periodic components. However, if the temporal fluctuations of the resonance frequency and amplitude are sufficiently simulated, the circuit scale becomes too large and can be roughly simulated. .

  Regarding the simulation of the vibration waveform by the one-degree-of-freedom viscous damping system model, a well-known method described in detail in Japanese Patent Application Laid-Open No. 2006-47451 can be applied, and thus detailed description thereof is omitted.

  Note that the waveform data of the harmonic resonance sound and the non-periodic resonance sound is not limited to being simulated by the one-degree-of-freedom viscous damping system model. In short, of the waveform data of harmonic resonance sound and non-periodic resonance sound created in advance, when reading the waveform data of the non-periodic resonance sound or generating the non-periodic resonance signal based on the waveform data, when pedaling again May be configured to stop. In general, in a device that mixes and outputs the resonance sounds generated by two types of resonance sound waveform data, when the pedal is depressed again, the generation of the musical sound signal by one resonance sound waveform data is stopped. To be configured.

  Further, the level of the synthesized resonance signal is controlled by the multiplication unit 23 in accordance with the depression amount of the pedal 7. Similarly, the second sound signal is generated between the normal sound generation unit 15 and the first addition unit 21. A multiplication unit may be provided to change the level of the normal sound according to depression of the pedal 7. For example, the level of the normal sound signal can be lowered in response to the on operation of the pedal 7.

  Furthermore, a third multiplication unit that controls the level of the harmonic resonance signal according to the determination result of the pedal state determination unit 24 may be provided between the harmonic resonance generator 16 and the second addition unit 22. After controlling the third multiplication unit, the pedal 7 is turned off, the level of the harmonic resonance signal is lowered as time elapses, and when the pedal 7 is turned on again, the level at that time is reached. Outputs harmonic resonance signal. Thereby, in addition to the level being lowered according to the decay rate of the harmonic resonance signal set for the sound source, it is possible to provide an effect of speeding up the decay of the harmonic resonance signal. An acoustic piano is suitable for simulating this effect because the resonance noise is reduced when the damper pedal is depressed again.

  In each of the above embodiments, an electronic piano is described as an example of an electronic musical instrument to which the resonance sound generating device is applied. However, the present invention is not limited to the electronic piano, and the present invention can be applied to other musical instruments. It is possible to take the same configuration within the scope of the invention.

It is a block diagram which shows the principal part function of the resonance generator which concerns on 1st Embodiment of this invention. It is a block diagram which shows the hardware component part of the resonance generator which concerns on embodiment of this invention. It is a timing chart which shows change of a normal sound signal and a resonance sound signal. It is a flowchart which shows the main process of a resonance generator. It is a flowchart which shows a keyboard event process. It is a flowchart which shows a pedal event process. It is a block diagram which shows the principal part structure of a resonant sound generation part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... CPU, 7 ... Damper pedal, 7a ... Pedal sensor, 8 ... Keyboard, 8a ... Keith switch, 10 ... Waveform memory, 11 ... Digital filter, 15 ... Normal sound generating part, 16 ... Overtone resonance generating part, 17 ... A non-periodic resonance sound generation unit, 18 ... a normal sound wave shape storage unit, 19 ... a double sound wave shape storage unit, 20 ... a non-periodic resonance sound wave shape storage unit, 24 ... a pedal state determination unit, 25 ... a non-periodic resonance sound generation control unit, 26 ... Level control section

Claims (8)

A normal sound generating means for generating a normal sound in response to a pronunciation instruction;
First resonance generating means for generating a first resonance of the normal sound in response to the sound generation instruction;
Second resonance generating means for generating a second resonance of the normal sound;
When the damper operation element is operated, the second resonance sound is generated in response to the sound generation instruction, and when the operation of the damper operation element is finished, all the second resonance sounds generated at that time are generated. A second resonance generation control means for silencing;
Resonance sound mixing means for adding the first resonance sound and the second resonance sound to form a mixed resonance sound;
Level control means for controlling the output of the mixed resonance sound according to the operation of the damper operator;
A musical sound mixing means for adding the normal sound and the mixed resonance sound whose level is controlled ;
The first resonance sound is a resonance sound when the damper operation element is operated after the sound generation instruction,
The resonance sound generating apparatus according to claim 1, wherein the second resonance sound is a resonance sound added to the first resonance sound, which is a resonance sound when the damper operation element is operated prior to the sound generation instruction . The level control means is configured to change a multiplication coefficient from zero to a predetermined value in a first predetermined time when the damper operation element is turned on, and to multiply the multiplication coefficient when the damper operation element is turned off. Means for changing from a predetermined value to zero at a second predetermined time different from the first predetermined time;
2. The resonance generating apparatus according to claim 1, wherein the output of the mixed resonance is controlled by multiplying the output of the mixed resonance by the multiplication coefficient. The level control means comprises means for changing a multiplication coefficient corresponding to the operation amount of the damper operator;
2. The resonance generator according to claim 1, wherein the output level of the mixed resonance is controlled by multiplying the output of the mixed resonance by the multiplication coefficient. The first resonance generating means and the second resonance generating means are a waveform storage means storing waveform data, and the first resonance sound and the second resonance sound based on the waveform data read from the waveform storage means. resonance generator according to any one of claims 1-3, characterized that you have a tone generator for generating sounds, respectively. The waveform storage means stores waveform data of the first resonance generated from the harmonic component of the normal sound and waveform data of the second resonance generated from the non-periodic component of the normal sound. The resonance generating apparatus according to claim 4, wherein: The second resonance generating control means according to claim 1-5, characterized in that it is configured to generate in response a second resonance to the sound instruction to preset sound or range normal sound of The resonance generator according to any one of the above. The waveform data of the first resonance sound and the waveform data of the second resonance sound are obtained by inputting a musical sound signal to a circuit group in which a plurality of resonance circuits corresponding to overtones of normal sound that can be generated are connected in parallel. Monodea Rukoto resonance generator according to claim 5 or 6, wherein. The resonance circuit has a digital filter, and an impulse response of the resonance circuit simulates a vibration waveform of a harmonic overtone with a one-degree-of-freedom viscous damping system model,
Filter coefficients used in the digital filter are
Given the mass, damping natural frequency, and damping rate as model parameters for determining the behavior of the one-degree-of-freedom viscous damping system model, find the viscosity coefficient and stiffness coefficient that are the coefficients of the equation of motion of the model,
The Laplacian transformation of the equation of motion of the model is obtained to obtain a transfer function expression of s expression, and the obtained viscosity coefficient, stiffness coefficient and mass are substituted into this, bilinear transformation is performed to obtain a filter coefficient of z expression,
The mass is an arbitrary value, the damped natural frequency is the frequency of the harmonic to be simulated, and the damping rate is determined by obtaining the value as an index when the attenuation of the harmonic is approximated by an exponential function. by resonance generator according to claim 7, wherein Rukoto.

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