JP2018159734A - Timbre controller, timbre control method, program, and electric musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a timbre controller that reduces a sounding lag in timbre switching in a method with less operation restrictions.SOLUTION: A CPU 6 selects in-timbre-1/2-switching filter coefficient arrays [i] and [x] of a note number [nn] of a key, pressed newly during a waveform data transfer period, out of in-timbre-1/2-switching filter coefficient arrays cf1 [nn], [i], and [x]. Filter coefficients x(0)-x(1,023) of respective indexes i changing from [1] to [4] with an elapsed time clocked during a period from the starting point of timbre switching to the end of waveform data transfer are supplied as multiplication coefficients to multipliers m1-mn of a filter part 10 to perform convolutional operation. Consequently, musical sound data that a sound source part 9 generates based upon waveform data of a timbre 1 in response to new keying during the waveform data transfer period has timbres thereof corrected by the filter part 10 to resemble a timbre 2 in steps according to the values [1]-[4] of indexes i.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a timbre control apparatus, a timbre control method, a program, and an electronic musical instrument that correct a timbre.

  In an electronic musical instrument having a sound source configured by a known waveform memory readout method, a flash memory having a low storage capacity and a large storage capacity is used as an external memory (secondary storage device) in order to reduce the product cost. In many cases, a RAM that is more expensive than the above but can be read and written at high speed is used as an internal memory (primary storage device).

  In such an electronic musical instrument, in addition to waveform data of various timbres, rhythm pattern data for automatic accompaniment or registration data for various settings is stored in an external memory, and a musical tone desired by the user is generated from these data. Data necessary for the transfer to the internal memory.

  As this type of device (electronic musical instrument), for example, in Patent Document 1, when transferring a data group to be transferred at the time of activation among various data stored in the first storage unit, to the second storage unit, The waveform data of a predetermined tone color is preferentially transferred among the waveform data constituting the data group, and depending on the transfer situation, for example, the operation is shortened from the start (startup) by reducing the number of simultaneous sounds. A technique for enabling performance in time is disclosed.

Japanese Patent No. 4475323

  By the way, in the apparatus disclosed in Patent Document 1, it is possible to make it possible to perform in a short time from the start of transfer (startup) by operation restriction that reduces the number of simultaneous sounds, but in a method with less operation restriction, It did not provide a method for reducing the delay in pronunciation when switching tones.

  The present invention has been made in view of such circumstances, and relates to a timbre control apparatus, a timbre control method, a program, and an electronic musical instrument that can reduce a pronunciation delay at the time of timbre switching by a method with less operation restriction.

  The tone color control apparatus of the present invention includes a tone generation control unit that performs control to generate a tone by reproducing waveform data of the first tone stored in the first storage unit, and a first tone change control unit according to a tone switching instruction. Waveform data of a second tone color different from the waveform data of the first tone color being reproduced by the tone generation control unit from the waveform data of a plurality of types of tone colors stored in the storage unit 2. A waveform transfer unit for transferring to the storage unit, and the tone generation control unit during the waveform data transfer period until the waveform transfer unit finishes transferring the waveform data of the second tone color to the first storage unit. A timbre correction unit configured to correct the tone color of the musical tone generated by reproducing the waveform data of the first timbre so as to be close to the second timbre.

  According to the timbre control method of the present invention, the timbre control device reproduces the waveform data of the first timbre stored in the first storage unit to generate a musical tone, and the second timbre control apparatus performs the second timbre control device according to the timbre switching instruction. Transferring waveform data of a second tone color different from the waveform data of the first tone color being reproduced from the waveform data of a plurality of types of tone colors stored in the storage unit to the first storage unit; The tone color of the musical tone generated by reproducing the waveform data of the first tone color during the waveform data transfer period until the waveform data of the tone color 2 is completely transferred to the first storage unit is changed to the second tone color. It is characterized by correcting so that it approaches.

  The program of the present invention provides a musical tone generating step for generating a musical tone by reproducing waveform data of the first timbre stored in the first storage unit on a computer mounted on the timbre control device, and a timbre switching instruction. In response, the waveform data of the second timbre different from the waveform data of the first timbre reproduced in the musical tone generation step from the waveform data of the plurality of types of timbres stored in the second storage unit. A waveform transfer step for transferring to the first storage unit, and the generation of the musical sound during the waveform data transfer period until the waveform data of the second tone color is transferred to the first storage unit in the waveform transfer step. And a tone color correcting step of correcting the tone color of the musical tone generated by reproducing the waveform data of the first tone color in the step so as to approach the second tone color.

  In the present invention, it is possible to reduce the sound generation delay at the time of timbre switching by a method with less operation restriction.

FIG. 1A is an external view showing an operation panel P of an electronic musical instrument 100 according to an embodiment of the present invention, and FIG. 1B is a block diagram showing an electrical configuration of the electronic musical instrument 100. FIG. 2A is a memory map showing the data configuration of the timbre ROM 4, and FIG. 2B is a memory map showing the data configuration of the timbre RAM 5. 3A is a memory map showing the data configuration of the ROM 7, and FIG. 3B is a memory map showing the data configuration of the RAM 8, and the filter coefficient array cf1 [i] [x] stored in the filter coefficient area FCA. It is a figure which shows an example. Overview of the three-dimensional filter coefficient array cf1 [nn] [i] [x] obtained by extending the two-dimensional filter coefficient array cf1 [i] [x] illustrated in FIG. 3B in correspondence with the note number nn. FIG. 2 is a block diagram showing a configuration of a filter unit 10. FIG. It is a flowchart which shows the filter coefficient arrangement | sequence production method. FIG. 7A is a diagram for explaining the contents of steps SA1 to SA3 in the filter coefficient array generating method, and FIG. 7B is a diagram for explaining the contents of steps SA10 to SA17 in the filter coefficient array generating method. It is. It is a flowchart which shows operation | movement of the main routine which CPU6 performs. It is a flowchart which shows the operation | movement of the timbre switching process which CPU6 performs.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A. Appearance and Overall Configuration With reference to FIG. 1, an appearance and an overall configuration of an embodiment will be described. FIG. 1A is an external view showing an external appearance of an operation panel P of an electronic musical instrument 100 according to an embodiment provided with a timbre control device according to the present invention. FIG. 1B is a block diagram showing the overall configuration of an electronic musical instrument 100 according to an embodiment including a timbre control device according to the present invention.

  In FIG. 1, a keyboard 1 generates performance input information including a key-on / key-off signal, a key number, a velocity, and the like corresponding to a performance input operation (press / release key operation). The performance input information generated by the keyboard 1 is converted into a MIDI format note-on / note-off event by the CPU 6 and then supplied to the tone generator unit 9.

  The operation unit 2 includes various operation switches disposed on the operation panel P of the musical instrument, and generates a switch event corresponding to a switch type operated by a user (performer). In the present embodiment, as shown in FIG. 1A, in addition to the power switch PS for powering on / off the apparatus power, for example, timbre switches TS1 to TS3 for switching the timbre of the generated musical sound are provided.

  As shown in FIG. 1A, the operation panel P of the musical instrument is provided with an LCD panel constituting the display unit 3. The display unit 3 includes an LCD panel, a driver (not shown) that drives the LCD panel to display, and a controller (not shown) that controls the display of the driver, and each unit of the musical instrument according to a display control signal supplied from the CPU 6. Displays the setting status and operating status of the screen.

  The timbre ROM 4 is composed of a nonvolatile memory such as a flash memory which is inexpensive and has a large storage capacity. In order to simplify the explanation, the timbre ROM 4 has a timbre 1 waveform data area WDA1 and a timbre 2 waveform data area WDA2 in which waveform data of three timbres are stored, respectively, as in the example shown in FIG. And a tone color 3 waveform data area WDA3.

  The timbre RAM 5 is a volatile memory that can be read and written at a higher speed than the timbre ROM 4, and includes a region A and a region B that are two storage areas illustrated in FIG. Area A is a storage area from which sound source 9 reads waveform data under the control of CPU 6. The area B is a storage area in which the waveform data of the timbre selected by the timbre switches TS1 to TS3 operated by the user is read from the timbre ROM 4 and stored under the control of the CPU 6. The areas A and B are not fixed storage areas, but dynamically change so that the area A functions as the area B (or the area B is the area A).

  The CPU 6 sets the operating state of each part of the apparatus based on various switch events supplied from the operation unit 2 and instructs the sound source unit 9 to generate musical tone data based on performance input information supplied from the keyboard 1. Further, the CPU 6 functions as a timbre control device that eliminates any delay in sound generation at the time of timbre switching and changes the musical tone data of the timbre currently being sounded by the sound source unit 9 to a timbre to be switched gradually. The functional configuration of the timbre control device will be described later.

  For example, the ROM 7 composed of a flash memory or the like includes a program data area PA and a control data area CDA as shown in FIG. Various control programs for operating the CPU 6 are stored in the program data area PA of the ROM 7. The various control programs include a main routine described later and a tone color switching process called from the main routine. In the control data area CDA of the ROM 7, various control data and parameters for setting the musical instrument operation are stored.

  As shown in FIG. 3B, the RAM 8 includes a work area WA for temporarily storing various register / flag data used by the CPU 6 and a filter coefficient area FCA. In the filter coefficient area FCA, a three-dimensional data table having a read address of a note number nn, an index i (described later), and a sample number x (described later) of the depressed key is factory preset for each tone color switching pattern. . Specifically, the filter coefficient array cf1 [nn] [i] [x] at the time of timbre 1/2 switching, the filter coefficient array cf2 [nn] [i] [x] at the time of timbre 2/3 switching, and the timbre 3/1 switching. The time filter coefficient array cf3 [nn] [i] [x] is provided, and the purpose of these will be described in detail later.

  The sound source unit 9 is configured by a known waveform memory reading method, and includes a plurality of simultaneous sound generation channels. The tone generator 9 generates (generates) musical tone data based on the waveform data supplied from the CPU 6 and read from the area A of the timbre RAM 5 according to the note-on event based on the performance input information, and silences the musical sound data according to the note-off event ( Stop.

  The filter unit 10 is composed of a known FIR filter used for convolution calculation. The configuration of the filter unit 10 will be described with reference to FIG. The filter unit 10 applies the above-described filter coefficient array cf [nn] [] to the input and output of the delay elements d1 to dn that delay the input signal by one sample and the n delay stages d1 to dn connected in cascade. i] [0] to cf [nn] [i] [xn], and multipliers m1 to mn for outputting, and adders a1 to an for adding the outputs of the multipliers m1 to mn.

  The sound system 11 DA-converts the musical tone data output from the filter unit 10 into an analog musical tone signal, performs filtering such as removing unnecessary noise from the musical tone signal, and then amplifies this to a speaker ( Sound is emitted from (not shown).

B. Description of timbre control device (Summary of Invention)
(1) Configuration of Tone Control Device Next, a functional configuration of the timbre control device included in the electronic musical instrument 100 having the above configuration will be described. In the electronic musical instrument 100, tone 1 waveform data is stored in the area A of the tone color RAM 5 by initialization (initialization processing) at start-up, and tone data based on the tone 1 waveform data according to the user's (key performer) key release operation. For example, the timbre control apparatus executes processing from the time when the user operates the timbre switch TS2 until the waveform data of the timbre 2 is completely loaded into the area B of the timbre RAM 5 when the user operates the timbre switch TS2.

  The timbre control device is based on the waveform data of timbre 1 during the period from when the timbre switching is started until the waveform data of timbre 2 is completely loaded into the area B of the timbre RAM 5 (hereinafter referred to as the waveform data transfer period). The generated tone data is corrected so that the tone color gradually resembles tone 2.

  That is, during the waveform data transfer period, the tone data generated based on the waveform data of tone 1 read out from the area A of the tone color RAM 5 by the sound source unit 9 is converted into the tone color under the control of the CPU 6 by the filter unit 10 described above. Corrections are made to resemble tone 2 step by step. By doing so, it is possible to add an effect that eliminates any delay in sound generation at the time of timbre switching and changes the timbre being sounded to a timbre to be switched gradually.

  For example, the correction of the timbre when the waveform data of timbre 1 is switched to the waveform data of timbre 2 is applied to each of the multipliers m1 to mn (see FIG. 5) constituting the filter unit 10 in the filter coefficient area FCA (FIG. 3) of the RAM 8. The filter coefficient array cf1 [nn] [i] [0] to cf1 [nn] [i] [xn] read from timbre 1/2 switching read out from (b) is given as a multiplication coefficient to perform a convolution operation. Is done.

  The timbre 1/2 switching filter coefficient array cf1 [nn] [i] [x] configured as a three-dimensional data table is a note number corresponding to each of the 88 keys constituting the keyboard 1, as shown in FIG. A filter coefficient array [i] [x] for each [nn] is assigned, and a filter coefficient array corresponding to a note number nn of a key that is newly pressed during the waveform data transfer period is selected. For example, when the C4 note (note number nn: 60) of the keyboard 1 is pressed, the filter coefficient array cf1 [60] [i] [x] is selected.

  In addition, the filter coefficient array cf1 [nn] [i] [x] at the time of timbre 1/2 switching is the filter coefficient array for each index i of [0] to [4] as illustrated in FIG. Assigned. In this embodiment, when the index i is [0], all the filter coefficient arrays x (0) to x (1023) are “1.0”, which are multiplied by the multipliers m1 to mn of the filter unit 10. Even if the convolution operation is performed, the frequency characteristic of the signal input to the filter unit 10 does not change, so that tone color correction is not performed.

  The index i of [1] to [4] is a value indicating which one of the four divided waveform data transfer periods corresponds to, and according to the elapsed time measured by the timer from the time when the timbre switching is started, 1] to [4]. Accordingly, the filter coefficient arrays [1] [x] to [4] [x] specified by the index i that changes to [1] to [4] as the time elapsed from the time when the timbre switching is started pass. A multiplication coefficient is given to the multipliers m1 to mn of the filter unit 10, and the tone data generated from the waveform data of tone 1 is corrected so as to resemble tone 2 step by step.

  The timbre 1/2 switching filter coefficient array cf1 [nn] [i] [x] factory preset in the filter coefficient area FCA (see FIG. 3B) of the RAM 8 is stored in the area A of the timbre RAM 5 as described above. When the waveform data of timbre 1 has been stored and the user (performer) operates the timbre switch TS2 to instruct switching to the timbre 2, it is referred to by the timbre controller.

  The timbre 2/3 switching filter coefficient array cf2 [nn] [i] [x] indicates that the timbre 2 waveform data is stored in the area A of the timbre RAM 5, and the user (performer) sets the timbre switch TS3. When the operation is instructed to switch to timbre 3, it is referred to by the timbre controller.

  The timbre 3/1 switching filter coefficient array cf3 [nn] [i] [x] indicates that the timbre 3 waveform data is stored in the area A of the timbre RAM 5, and the user (performer) sets the timbre switch TS1. When the operation is instructed to switch to timbre 1, it is referred to by the timbre controller.

  In the present embodiment, the timbre 1/2 switching filter coefficient array cf1 [nn] [i] [x], the timbre 2/3 switching filter coefficient array cf2 [nn] [i] [x], and the timbre 3 / The filter coefficient array cf3 [nn] [i] [x] at the time of 1 switching is factory preset in the RAM 8, but the present invention is not limited to this, and the CPU 6 is used to generate these filter coefficient arrays cf1 to cf3. It doesn't matter.

(2) Method for Generating Filter Coefficient Array cf Next, a method for generating the filter coefficient array cf will be described with reference to FIG. Hereinafter, as an example, a method of generating the timbre 1/2 switching filter coefficient array cf1 [nn] [i] [x] will be described. The generation method shown in FIG. 6 is a technique for acquiring the filter coefficient array cf1 [i] [x] using waveform data of tone color 1 / tone 2 at an arbitrary pitch, and is realized by computer processing.

  In order to generate the timbre 1/2 switching filter coefficient array cf1 [nn] [i] [x] corresponding to all the pitches of the 88 keys constituting the keyboard 1, C8 from the A0 sound (note number: 21) Filter coefficient arrays cf1 [21] [[i] [x] to cf1 [108] [[i] [x] for each pitch up to the sound (note number: 108) are acquired.

  The subject of each processing operation in steps SA1 to SA18 described below is a computer. First, in step SA1 shown in FIG. 6, as an example, FFT processing (fast Fourier transform) is performed on waveform data of tone 1 for a predetermined number of samples in C4 sound (note number: 60). Similarly, in step SA2, FFT processing (fast Fourier transform) is performed on waveform data of tone 2 corresponding to the predetermined number of samples in the C4 sound (note number: 60).

  Subsequently, in step SA3, as shown in FIG. 7A, the amplitude spectrum (1024 points) of the waveform data of timbre 1 from the amplitude spectrum (1024 points) of the waveform data of timbre 2 subjected to frequency analysis by FFT processing. Each difference is calculated. Thereby, the difference data df [0] to df [1023] representing the difference between the frequency amplitudes in each frequency channel is acquired. The difference data df [0] to df [1023] corresponds to the difference between the timbre 2 and the timbre 1 in the frequency domain.

  Next, in step SA4, the sample number x is reset to zero. In subsequent steps SA5, SA8, and SA9, in the array CF [0] [x] in which the index i is “0”, the sample number x is incremented and incremented, and the sample number x is changed from “0” to “1023”. “1” is set in all the corresponding arrays CF [0] [x]. As a result, the generation of the array CF [1] [x] in which the value of the index i is “0” is completed.

  In step SA6, the value of index i is set to “4”. In the next steps SA7 to SA9, in the array CF [4] [x] where the index i is “4”, the sample number x corresponds to “0” to “1023” while incrementing the sample number x. Difference data df [0] to df [1023] corresponding to the sample number x is set in all the arrays CF [4] [x] to be performed. Thus, the generation of the array CF [4] [x] with the index i of “4” is completed.

  When the incremented sample number x exceeds “1023”, the determination result in step SA9 is “YES”, the process proceeds to step SA10, and the index i is set to “3”. Subsequently, in step SA11, the sample number x is reset to zero. In the next step SA12, a value df [x] / 4 obtained by dividing the difference data df [x] corresponding to the sample number x by “4” is set as a difference value d [x] corresponding to the sample number x.

  Next, in steps SA13, SA14, and SA15, the difference value d [corresponding to the sample number x from the array CF [4] [x] in which the index i + 1 is “4” according to the sample number x incremented and advanced. x] is subtracted. Thereby, the generation of the array CF [3] [x] with the index i of “3” is completed.

  When generation of the array CF [3] [x] is completed and the incremented sample number x exceeds “1023”, the determination result of the above step SA15 becomes “YES”, and the process proceeds to step SA16. Is decremented, and the index i is set to “2”. Next, in step SA17, since the value of the decremented index i is “2”, the determination result is “NO”, and the process returns to step SA11 described above.

  Returning to step SA11 again, when the sample number x is reset to zero, in the next step SA12, a value df [x] / 4 obtained by dividing the difference data df [x] corresponding to the sample number x by “4” is obtained as the sample number. The difference value d [x] corresponding to x is assumed. Thereafter, in steps SA13, SA14, and SA15, the difference value d corresponding to the sample number x from the array CF [3] [x] where the index i + 1 is “3” in accordance with the sample number x to be incremented and advanced. [X] is subtracted. Thus, the generation of the array CF [2] [x] with the index i of “2” is completed.

  When generation of the array CF [2] [x] has been completed and the incremented sample number x exceeds “1023”, the determination result in step SA15 becomes “YES”, and the process proceeds to step SA16. Is decremented, and the index i is set to “1”. Next, in step SA17, since the value of the decremented index i is “1”, the determination result is “NO”, and the process returns to step SA11 described above.

  Returning to step SA11 again, when the sample number x is reset to zero, in the next step SA12, a value df [x] / 4 obtained by dividing the difference data df [x] corresponding to the sample number x by “4” is obtained as the sample number. The difference value d [x] corresponding to x is assumed. Thereafter, in steps SA13, SA14, and SA15, the difference value d corresponding to the sample number x from the array CF [2] [x] where the index i + 1 is “2” in accordance with the sample number x to be incremented. [X] is subtracted. Thereby, the generation of the array CF [1] [x] with the index i of “1” is completed.

  Thus, when the generation of the array CF [1] [x] is completed and the incremented sample number x exceeds “1023”, the determination result in Step SA15 becomes “YES”, and the process proceeds to Step SA16. Then, the value of the current index i is decremented and the index i is set to “0”. In step SA17, since the value of the decremented index i is “0”, the determination result is “YES”, and the process proceeds to the next step SA18.

  In step SA18, IFFT processing (inverse fast Fourier transform) is performed for each of the arrays CF [0] [x] to CF [4] [x] having indexes i of “0” to [4] generated as described above. Apply. By this IFFT processing (inverse fast Fourier transform), the frequency domain arrays CF [0] [x] to CF [4] [x] are converted to the time domain tone color 1/2 switching filter coefficient array cf1 used for the convolution operation. [I] [x].

  Note that, as described above, the values “1” to “4” of the index i are values representing which of the waveform data transfer periods divided into four. In the present embodiment, the value of the index i sequentially changes from “1” to “4” according to the elapsed time measured by the timer from the time when the timbre switching is started.

  As described in the generation method described above, the array CF [4] [x] with the index i of “4” is the difference data df [0] to df [1023] itself representing the difference between the timbre 2 and the timbre 1. On the other hand, the array CF [3] [x] whose index i value is “3” subtracts the difference value d [x] from the array CF [4] [x], and the index i value is “2”. ”Is subtracted from the array CF [3] [x], and the array CF [1] [x] whose index i is“ 1 ”is subtracted from the array CF [2] [x]. , The difference value d [x] is subtracted from the array CF [2] [x].

  Accordingly, as in the example illustrated in FIG. 7B, when the waveform data transfer period is T, the value of the index i is “1” until T / 4 has elapsed from the start of timbre switching. The value of index i is “2” from the time T / 4 elapses until T / 2 elapses, and the value of index i is “3” until 3T / 4 elapses from time T / 2 elapses. The value of the index i is “1” from the time when / 4 has elapsed until T has elapsed.

  Thus, the timbre 1/2 switching filter coefficient array cf1 [i] [i] [i] [x] based on the array CF [i] [x] specified by the index i that changes according to the elapsed time from the time when the timbre switching is started. x] is generated, it is possible to correct the musical tone data generated from the waveform data of tone 1 so as to resemble tone 2 step by step. Further, since the musical tone data generated from the waveform data of tone 1 is made to resemble tone 2 in a stepwise manner, there is also an effect of reducing the sense of incongruity compared to the case of making it suddenly resemble tone 2.

C. Operations of Embodiments Next, as operations of the electronic musical instrument 100 having the above-described configuration, operations of the main routine executed by the CPU 6 and tone color switching processing called from the main routine will be described with reference to FIGS. .

(1) Operation of Main Routine FIG. 8 is a flowchart showing the operation of the main routine executed by the CPU 6. When the CPU 6 executes the main routine in response to the power-on of the electronic musical instrument 100, the CPU 6 proceeds to step SB1 and executes initialization processing (initialization). In the initialization process, for example, the waveform data of timbre 1 stored in the timbre ROM 4 is transferred to the area A of the timbre RAM 5, and various register flags provided in the work area WA (see FIG. 3B) of the RAM 8 are set. Reset to zero or set the initial value.

  Next, in step SB2, switch scanning for detecting a switch event of the operation unit 2 is performed, and in subsequent step SB3, it is determined whether or not the switch event detected by this switch scanning is due to a timbre switch operation. If the switch event detected by the switch scanning is something other than the timbre switch operation, the determination result is “NO”, the process proceeds to step SB4, and after performing other switch processing corresponding to the detected switch event, step SB6 is performed. Proceed to

  On the other hand, if the switch event detected by the switch scanning is a timbre switch operation, the determination result in step SB3 is “YES”, and the CPU 6 wakes up the timbre switching process task. In the timbre switching process, as will be described later, the elapsed time from the time when the timbre switch is operated (timbre switching time) starts to be measured by the timer, and the index i is set to “1”.

  Thereafter, until the waveform data of tone 2 stored in the tone ROM 4 is completely loaded into the area B of the tone RAM 5 (waveform data transfer), the waveform data transfer period is divided into four parts every time t. When the value of i is incremented and stepped, and the waveform data transfer period has passed, the timer stops timing, the index i is set to “0”, and then the waveform data of the second tone color is transferred to the tone color RAM 5. The area B is switched to the area A, and the area A of the timbre RAM 5 storing the waveform data of the first timbre is switched to the area B.

  When the task of timbre switching processing is woken up, the CPU 6 advances the processing to step SB6 and performs keyboard scanning for detecting the presence or absence of a key change. Next, in step SB7, the key change is determined based on the result of the keyboard scan in step SB6. That is, when the key pressing operation or the key releasing operation is not performed and no key change occurs, the CPU 6 advances the process to step SB10 to be described later via step SB7.

  On the other hand, when key-on due to a key pressing operation is detected, the process proceeds to step SB8 via step SB7, and based on performance input information generated by the keyboard 1 in response to the key pressing operation by the user (performer). Generate a note-on event. On the other hand, if key-off due to a key release operation is detected, the process proceeds to step SB9 via step SB7, and note-off is performed based on performance input information generated by the keyboard 1 in response to a user (player) key-release operation. Generate an event.

  Then, when proceeding to step SB10, the CPU 6 sends the note-on event generated in step SB8 to the sound source unit 9 to instruct the tone generation of the musical tone designated by the note-on event, or in step SB9. The generated note-off event is sent to the sound source unit 9, and sound source processing for instructing to mute the musical tone having the pitch specified by the note-off event among the already-generated musical sounds is executed.

  Thereafter, in step SB11, the CPU 6 functioning as a timbre control device executes a filter process linked to the timbre switching process in step SB5 described above. For example, assuming that a timbre switch operation for switching from timbre 1 to timbre 2 is performed, the filter processing is configured as a three-dimensional data table and stored in the RAM 8 as described above in the filter processing. Select the filter coefficient array [i] [x] at timbre 1/2 switching of the note number [nn] of the key newly pressed during the waveform data transfer period from cf1 [nn] [i] [x] To do.

  In the selected timbre 1/2 switching filter coefficient array [i] [x], the elapsed time measured by the timer during the period from the start of timbre switching (timing of timbre switch operation) to the end of waveform data transfer. The filter coefficients x (0) to x (1023) of each index i that change to [1] to [4] according to the above are given as multiplication coefficients to the multipliers m1 to mn of the filter unit 10 and are subjected to a convolution operation. For musical tone data generated by the sound source unit 9 based on the waveform data of tone 1 in response to a new key depression during the data transfer period, the filter unit 10 steps the tone according to the values [1] to [4] of the index i. So that it is similar to timbre 2.

  Subsequently, when the filtering process in step SB11 is completed, the CPU 6 proceeds to step SB12 and determines whether or not the power switch is operated. If the power switch is not operated, the determination result is “NO”, and the process returns to step SB2. Thereafter, the processing of steps SB2 to SB12 is repeatedly executed until the power is turned off by the power switch operation.

  On the other hand, for example, when the user (performer) operates the power switch, the determination result in step SB12 is “YES”, the process proceeds to step SB13, and the current setting state is stored in the ROM 7 (rewritable flash memory). Then, a power-off process such as cutting the supplied power is executed, and this process is finished.

(2) Operation of Tone Switching Process Next, the operation of the timbre switching process will be described with reference to FIG. FIG. 9 is a flowchart showing the operation of the timbre switching process executed by the CPU 6. In the following, an example of timbre switching in which the waveform data of timbre 2 is transferred to the area B of the timbre RAM 5 in response to the operation of the timbre switch 2 in a situation where the waveform data of the timbre 1 has already been stored in the area A of the timbre RAM 5. Is assumed. The timbre switching process is performed by a task different from the main routine described above.

  When this process is executed through step SB3 (see FIG. 8) of the main routine described above, the CPU 6 proceeds to step SC1 shown in FIG. 9 and sets a timer Timer for measuring the elapsed time from the start of timbre switching to zero. Reset to start timing, and in the subsequent step SC2, the index i is set to "1".

  In step SC3, under the control of the CPU 6, loading of waveform data of tone color 2 stored in the tone color 2 waveform data area WDA2 of the tone color ROM 4 to the area B of the tone color RAM 5 is started (waveform data transfer). Next, when proceeding to step SC4, the CPU 6 determines whether or not the elapsed time counted by the timer Timer coincides with the time t obtained by dividing the waveform data transfer period into four.

  If the elapsed time measured by the timer Timer does not coincide with the time t obtained by dividing the waveform data transfer period into four, the determination result in step SC4 is “NO”, the process proceeds to step SC6, and whether or not the loading is completed. That is, it is determined whether or not the waveform data transfer period has passed. If the waveform data transfer period has not passed, the determination result is “NO”, and the process returns to step SC4.

  On the other hand, when the elapsed time measured by the timer Timer coincides with the time t obtained by dividing the waveform data transfer period into four, the determination result in step SC4 is “YES”, the process proceeds to step SC5, and the value of the index i is incremented. To advance. Therefore, the index i is “1” until the time t elapses from the time when the timbre switching is started.

  Next, when proceeding to step SC6, the CPU 6 once resets the timer Timer to zero. Then, the process proceeds to step SC7 to determine whether or not the waveform data transfer period has passed. If the waveform data transfer period has not passed, the determination result is “NO” and the process returns to step SC4. When the elapsed time counted again by the timer Timer coincides with the time t obtained by dividing the waveform data transfer period into four, the determination result in the above-mentioned step SC4 becomes “YES”, the process proceeds to step SC5, and the value of the index i is incremented. Then step forward to “2”.

  Thereafter, the value of the index i is incremented and set to “3” and “4” each time a time t obtained by dividing the waveform data transfer period by 4 elapses until the waveform data transfer period has passed. When the waveform data transfer period has passed, the determination result in step SC7 becomes “YES”, and the process proceeds to step SC8, where the CPU 6 resets the timer Timer to zero and stops timing. Subsequently, in step SC9, the index i is set to “0”. Thereafter, when proceeding to step SC10, the CPU 6 switches the area B of the tone color RAM 5 to which the waveform data of tone 2 is transferred to the area A and the area A of the tone color RAM 5 storing the waveform data of tone 1 to the area B. To finish this process.

  As described above, in the timbre switching process, the elapsed time from the timbre switching time point when the timbre switch is operated is started to be measured by the timer Timer, the index i is set to “1”, and the timbre stored in the timbre ROM 4 is thereafter stored. 2 until the waveform data transfer period is divided into four times t until the waveform data of 2 is loaded into the area B of the timbre RAM 5 (waveform data transfer). . Then, after the waveform data transfer period, the timer Timer is stopped, the index i is set to “0”, the area B of the timbre RAM 5 to which the waveform data of the timbre 2 is transferred is set to the area A, and the timbre 1 The area A of the tone color RAM 5 storing the waveform data is switched to the area B.

  As described above, in the present embodiment, for example, assuming that a timbre switch operation for switching from timbre 1 to timbre 2 is performed, the three-dimensional data table illustrated in FIGS. 3B and 4 is configured. Tone 1/2 of the note number [nn] of the key newly pressed during the waveform data transfer period from the filter coefficient array cf1 [nn] [i] [x] at the time of tone 1/2 switching stored in the RAM 8 2. Filter coefficient array [i] [x] at the time of 2 switching is selected.

  Then, in the selected timbre 1/2 switching filter coefficient array [i] [x], according to the elapsed time measured from the time when timbre switching is started (timing timbre switch operation time) to the end of waveform data transfer. The filter coefficients x (0) to x (1023) of each index i changing to [1] to [4] are given as multiplier coefficients to the multipliers m1 to mn (see FIG. 5) of the filter unit 10 to perform a convolution operation. As a result, with respect to the musical tone data generated by the tone generator 9 based on the waveform data of tone 1 in response to a new key depression during the waveform data transfer period, the filter unit 10 assigns the tone to the values [1] to [1] of the index i. 4] is corrected step by step so as to resemble timbre 2. As a result, there is an effect that the sound generation delay at the time of timbre switching is eliminated and the timbre being sounded is changed to the timbre to be switched gradually.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, In the implementation stage, it can change variously in the range which does not deviate from the summary. Further, the functions executed in the above-described embodiments may be combined as appropriate as possible. The above-described embodiment includes various stages, and various inventions can be extracted by an appropriate combination of a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the effect is obtained, a configuration from which the constituent requirements are deleted can be extracted as an invention.

Hereinafter, each invention described in the scope of claims at the beginning of the present application will be additionally described.
(Appendix)
[Claim 1]
A musical tone generation control unit for controlling the generation of musical tone by reproducing the waveform data of the first tone color stored in the first storage unit;
In response to a tone color switching instruction, a second tone data different from the first tone color waveform data being reproduced by the musical tone generation control unit from among a plurality of tone color waveform data stored in the second storage unit. A waveform transfer unit for transferring timbre waveform data to the first storage unit;
During the waveform data transfer period until the waveform transfer unit finishes transferring the waveform data of the second tone color to the first storage unit, the tone generation control unit reproduces the waveform data of the first tone color. A timbre control apparatus comprising: a timbre correction unit that corrects a timbre of a musical tone generated in such a manner as to approach the second timbre.
[Claim 2]
The tone correction unit
During the waveform data transfer period until the waveform transfer unit finishes transferring the waveform data of the second tone color to the first storage unit, the tone generation control unit reproduces the waveform data of the first tone color. The timbre of the musical tone generated in this way is corrected so as to gradually approach the second timbre according to the time elapsed from the time when the waveform transfer unit started the transfer. Tone control device.
[Claim 3]
A musical sound utterance instruction unit for instructing the generation of a musical sound with a specified pitch,
The waveform transfer unit transfers waveform data of a plurality of pitches corresponding to the second timbre stored in the second storage unit to the first storage unit in response to the timbre switching instruction. ,
The musical tone generation control unit is configured to specify the first timbre stored in the first storage unit and the specified tone in response to an instruction to generate a musical tone having a pitch specified by the musical tone utterance instruction unit. Play the waveform data of the pitch to generate a musical tone,
The tone correction unit
During the waveform data transfer period until the waveform transfer unit finishes transferring the waveform data of the plurality of pitches corresponding to the second tone color to the first storage unit, the pitch is specified by the musical tone utterance instruction unit In response to an instruction to generate the generated musical tone, the musical tone generation control unit reproduces the waveform data of the first timbre and the designated pitch and generates the timbre of the musical tone as the second timbre. The timbre control apparatus according to claim 1, wherein the timbre control apparatus corrects the timbre so as to approach each other.
[Claim 4]
The tone correction unit
During the waveform data transfer period until the waveform transfer unit finishes transferring the waveform data of a plurality of pitches corresponding to the second tone color to the first storage unit, the transfer to the first storage unit is performed. 4. The plurality of waveform data including the completed waveform data, wherein the tone color of a musical tone generated by reproducing the waveform data of the first tone color is corrected so as to be close to the second tone color. The timbre control device described.
[Claim 5]
The tone correction unit
A filter coefficient storage unit that stores a filter coefficient obtained by converting a difference value corresponding to a timbre difference in the frequency domain between the waveform data of the first timbre and the waveform data of the second timbre into a time domain; ,
A filter unit that performs a convolution operation according to a filter coefficient read from the filter coefficient storage unit,
During the waveform data transfer period until the waveform transfer unit finishes transferring the waveform data of the second tone color to the first storage unit, the tone generation control unit reproduces the waveform data of the first tone color. 2. The timbre control device according to claim 1, wherein the tone to be generated is corrected by the filter unit performing a convolution operation according to the filter coefficient so that the timbre of the musical tone approaches the second timbre.
[Claim 6]
The tone correction unit
A filter coefficient array storage unit that stores a plurality of three-dimensional filter coefficient arrays in which the filter coefficients correspond to pitches and orders;
A filter coefficient array corresponding to the pitch that is sounded during the waveform data transfer period and the order that changes according to the elapsed time from the time when the waveform transfer unit started the transfer is selected from the filter coefficient array storage unit. A selection section;
A filter unit that performs a convolution operation according to a filter coefficient included in the filter coefficient array selected by the selection unit,
During the waveform data transfer period until the waveform transfer unit finishes transferring the waveform data of the second tone color to the first storage unit, the tone generation control unit reproduces the waveform data of the first tone color. A musical tone having a pitch that is instructed to be generated is generated, and the musical tone generated by the filter unit is stepwise corresponding to an order that changes according to a time elapsed from the time when the waveform transfer unit started the transfer. The timbre control apparatus according to claim 1, wherein the timbre control apparatus corrects the timbre so as to approach the timbre of 2.
[Claim 7]
A filter coefficient generation unit for generating a filter coefficient obtained by converting a difference value corresponding to a difference in tone color in the frequency domain between the waveform data of the first tone color and the waveform data of the second tone color into a time domain; The timbre control apparatus according to claim 2, further comprising:
[Claim 8]
A filter coefficient obtained by converting a difference value corresponding to a timbre difference in the frequency domain between the waveform data of the first timbre and the waveform data of the second timbre into a time domain is instructed to be generated during a waveform data transfer period. 4. A filter coefficient array generation unit for generating a three-dimensional filter coefficient array corresponding to a pitch and an order that changes in accordance with a time elapsed from the start of waveform data transfer. The timbre control device described.
[Claim 9]
A method executed by a timbre controller,
Playing the waveform data of the first tone stored in the first storage unit to generate a musical tone;
In response to a tone color switching instruction, waveform data of a second tone color different from the waveform data of the first tone color being reproduced is selected from the waveform data of a plurality of types of tone colors stored in the second storage unit. Transferred to the first storage unit,
During the waveform data transfer period until the waveform data of the second timbre is transferred to the first storage unit, the tone color of the musical tone generated by reproducing the waveform data of the first timbre is generated in the second A timbre control method, wherein correction is performed so that the timbre approaches.
[Claim 10]
In the computer installed in the tone control device,
A tone generation step for generating a tone by reproducing the waveform data of the first tone stored in the first storage unit;
A second tone color different from the waveform data of the first tone color reproduced in the musical tone generation step from the waveform data of a plurality of types of tone colors stored in the second storage unit in response to a tone color switching instruction. A waveform transfer step for transferring the waveform data to the first storage unit;
During the waveform data transfer period until the waveform data of the second tone color is completely transferred to the first storage unit in the waveform transfer step, the waveform data of the first tone color is reproduced in the tone generation step. And a timbre correction step of correcting the timbre of the musical tone generated in such a manner as to be close to the second timbre.
[Claim 11]
A performance input unit for generating performance input information according to the performance input operation;
A musical sound generation instruction unit for instructing generation of musical sounds according to performance input information generated by the performance input unit;
The timbre control device according to any one of claims 1 to 5,
An electronic musical instrument characterized by comprising:

1 Keyboard 2 Operation section 3 Display section 4 Tone ROM
5 tone RAM
6 CPU
7 ROM
8 RAM
9 Sound source section 10 Filter section 11 Sound system 100 Electronic musical instrument

Claims (11)

A musical tone generation control unit for controlling the generation of musical tone by reproducing the waveform data of the first tone color stored in the first storage unit;
In response to a tone color switching instruction, a second tone data different from the first tone color waveform data being reproduced by the musical tone generation control unit from among a plurality of tone color waveform data stored in the second storage unit. A waveform transfer unit for transferring timbre waveform data to the first storage unit;
During the waveform data transfer period until the waveform transfer unit finishes transferring the waveform data of the second tone color to the first storage unit, the tone generation control unit reproduces the waveform data of the first tone color. A timbre control apparatus comprising: a timbre correction unit that corrects a timbre of a musical tone generated in such a manner as to approach the second timbre. The tone correction unit
During the waveform data transfer period until the waveform transfer unit finishes transferring the waveform data of the second tone color to the first storage unit, the tone generation control unit reproduces the waveform data of the first tone color. The timbre of the musical tone generated in this way is corrected so as to gradually approach the second timbre according to the time elapsed from the time when the waveform transfer unit started the transfer. Tone control device. A musical sound utterance instruction unit for instructing the generation of a musical sound with a specified pitch,
The waveform transfer unit transfers waveform data of a plurality of pitches corresponding to the second timbre stored in the second storage unit to the first storage unit in response to the timbre switching instruction. ,
The musical tone generation control unit is configured to specify the first timbre stored in the first storage unit and the specified tone in response to an instruction to generate a musical tone having a pitch specified by the musical tone utterance instruction unit. Play the waveform data of the pitch to generate a musical tone,
The tone correction unit
During the waveform data transfer period until the waveform transfer unit finishes transferring the waveform data of the plurality of pitches corresponding to the second tone color to the first storage unit, the pitch is specified by the musical tone utterance instruction unit In response to an instruction to generate the generated musical tone, the musical tone generation control unit reproduces the waveform data of the first timbre and the designated pitch and generates the timbre of the musical tone as the second timbre. The timbre control apparatus according to claim 1, wherein the timbre control apparatus corrects the timbre so as to approach each other. The tone correction unit
During the waveform data transfer period until the waveform transfer unit finishes transferring the waveform data of a plurality of pitches corresponding to the second tone color to the first storage unit, the transfer to the first storage unit is performed. 4. The plurality of waveform data including the completed waveform data, wherein the tone color of a musical tone generated by reproducing the waveform data of the first tone color is corrected so as to be close to the second tone color. The timbre control device described. The tone correction unit
A filter coefficient storage unit that stores a filter coefficient obtained by converting a difference value corresponding to a timbre difference in the frequency domain between the waveform data of the first timbre and the waveform data of the second timbre into a time domain; ,
A filter unit that performs a convolution operation according to a filter coefficient read from the filter coefficient storage unit,
During the waveform data transfer period until the waveform transfer unit finishes transferring the waveform data of the second tone color to the first storage unit, the tone generation control unit reproduces the waveform data of the first tone color. 2. The timbre control device according to claim 1, wherein the tone to be generated is corrected by the filter unit performing a convolution operation according to the filter coefficient so that the timbre of the musical tone approaches the second timbre. The tone correction unit
A filter coefficient array storage unit that stores a plurality of three-dimensional filter coefficient arrays in which the filter coefficients correspond to pitches and orders;
A filter coefficient array corresponding to the pitch that is sounded during the waveform data transfer period and the order that changes according to the elapsed time from the time when the waveform transfer unit started the transfer is selected from the filter coefficient array storage unit. A selection section;
A filter unit that performs a convolution operation according to a filter coefficient included in the filter coefficient array selected by the selection unit,
During the waveform data transfer period until the waveform transfer unit finishes transferring the waveform data of the second tone color to the first storage unit, the tone generation control unit reproduces the waveform data of the first tone color. A musical tone having a pitch that is instructed to be generated is generated, and the musical tone generated by the filter unit is stepwise corresponding to an order that changes according to a time elapsed from the time when the waveform transfer unit started the transfer. The timbre control apparatus according to claim 1, wherein the timbre control apparatus corrects the timbre so as to approach the timbre of 2.   A filter coefficient generation unit for generating a filter coefficient obtained by converting a difference value corresponding to a difference in tone color in the frequency domain between the waveform data of the first tone color and the waveform data of the second tone color into a time domain; The timbre control apparatus according to claim 2, further comprising:   A filter coefficient obtained by converting a difference value corresponding to a timbre difference in the frequency domain between the waveform data of the first timbre and the waveform data of the second timbre into a time domain is instructed to be generated during a waveform data transfer period. 4. A filter coefficient array generation unit for generating a three-dimensional filter coefficient array corresponding to a pitch and an order that changes in accordance with a time elapsed from the start of waveform data transfer. The timbre control device described. A method executed by a timbre controller,
Playing the waveform data of the first tone stored in the first storage unit to generate a musical tone;
In response to a tone color switching instruction, waveform data of a second tone color different from the waveform data of the first tone color being reproduced is selected from the waveform data of a plurality of types of tone colors stored in the second storage unit. Transferred to the first storage unit,
During the waveform data transfer period until the waveform data of the second timbre is transferred to the first storage unit, the tone color of the musical tone generated by reproducing the waveform data of the first timbre is generated in the second A timbre control method, wherein correction is performed so that the timbre approaches. In the computer installed in the tone control device,
A tone generation step for generating a tone by reproducing the waveform data of the first tone stored in the first storage unit;
A second tone color different from the waveform data of the first tone color reproduced in the musical tone generation step from the waveform data of a plurality of types of tone colors stored in the second storage unit in response to a tone color switching instruction. A waveform transfer step for transferring the waveform data to the first storage unit;
During the waveform data transfer period until the waveform data of the second tone color is completely transferred to the first storage unit in the waveform transfer step, the waveform data of the first tone color is reproduced in the tone generation step. And a timbre correction step of correcting the timbre of the musical tone generated in such a manner as to be close to the second timbre. A performance input unit for generating performance input information according to the performance input operation;
A musical sound generation instruction unit for instructing generation of musical sounds according to performance input information generated by the performance input unit;
The timbre control device according to any one of claims 1 to 5,
An electronic musical instrument characterized by comprising:

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