JP2012042842A - Electronic musical sound generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic musical sound generator that can smoothly replace a musical sound waveform with another one during sound production without reducing the number of simultaneous sound productions.SOLUTION: An electronic musical sound generator comprises: a digitally controlled oscillator 3 and a loop buffer 3a for starting to read out a rising portion of a musical sound waveform in response to the start of sound production of musical sound of Cin a channel 1 and subsequently shifts to reading-out of a repeated portion; and a digitally controlled oscillator 4 and a loop buffer 4a for, upon key pushing of C, starting to read out at least a repeated portion of a resonance sound musical sound waveform C+Cdifferent from the musical sound waveform Cread out by the digitally controlled oscillator 3 and loop buffer 3a, in response to a change in the musical sound waveform which has been started to produce. This makes it possible to replace a waveform with another one, such as replacing a musical sound waveform in a non-resonance state with a musical sound waveform in a resonance state.

Description

  The present invention relates to an electronic musical tone generator.

In the following Patent Document 1, the applicant can repetitively read out the musical sound waveform from the waveform memory 1 by the digitally controlled oscillator 3 of the sound source 2 shown in FIG. The repeated portion is buffered in a loop buffer 3a separate from the waveform memory 1, and is repeatedly read out by the digitally controlled oscillator 3 until the generation of the musical tone is completed, and the musical tone is generated. Since access to the waveform memory 1 is released (that is, the bus 10 is free), the next musical sound waveform can be read out, and a configuration for improving the reading speed of the musical sound waveform such as pre-reading has been proposed.
Japanese Patent No. 3636580

  However, although the above configuration describes that two types of musical sound waveforms are read out in the same time-division time slot, this merely indicates that two types of waveforms can be generated simultaneously. For this reason, there has been a problem that the musical sound waveform cannot be easily replaced during the sound generation.

  The present invention has been devised in view of the above problems, and an object of the present invention is to provide an electronic musical sound generating apparatus that can smoothly switch musical sound waveforms during sound generation without reducing the number of simultaneous sounds.

The configuration of the present invention is as follows:
In an electronic musical sound generator capable of simultaneously reading out two or more musical sound waveforms for a plurality of time division time slots and capable of generating a plurality of musical sounds in the time division time slots,
During the time division time slot,
First reading means for reading from one rising portion to a repeating portion of the musical sound waveform;
Second reading means for reading at least a repetitive portion of a musical sound waveform different from the musical sound waveform read by the first reading means;
Weighting means for receiving the musical sound waveform read by the first and second reading means, assigning weights to each of them as time elapses, and sending them out;
A basic feature is that the plurality of musical sounds are generated by a modulating means for generating a musical sound by applying various modulations to the signal transmitted by the weighting means.

  According to the above configuration, when the first reading unit is subjected to the loop reading of the repetitive portion and released from the reading of the rising portion, the second reading unit repeats at least another repetitive portion (of different musical sound waveform). The weighting means that performs reading and receives the outputs from the two reading means in order cross-fades the output that was received first and the output that was received later, and outputs it (according to the passage of time) Therefore, the waveform can be switched smoothly without reducing the number of simultaneous sounds.

  When the first reading means identifies that it has reached the beginning of the repeated portion when reading one of the musical sound data, the first reading means stores the read sound waveform of the repeated portion in the loop buffer and When it is identified that the end has been reached, the waveform can be switched smoothly by switching to the loop buffer and repeatedly reading until the end of the tone generation and switching the tone data reading to the second reading means. It becomes like this.

  Further, the first reading means starts reading the rising portion of the musical sound waveform based on the start of tone generation, and the second reading means performs the first reading based on the waveform change of the tone that has started sounding. By starting the reading of at least the repetitive portion of the musical sound waveform different from the musical sound waveform read by one reading means, it becomes possible to cope with various types of waveform switching.

  As one aspect of such waveform switching, it can be assumed that the waveform change is based on a player's tone color switching instruction.

  That is, the first reading means starts reading the rising portion after the reading of the rising portion, and the second reading means reads the waveform of the rising portion or the repeating portion of the next musical tone waveform to switch the tone color. The first and second musical sound waveforms having different tone colors according to the operation are read out, and the above processing [the output of the one received first by the weighting device receiving the outputs from the two reading devices in order] Then, the output of the one received later is crossfaded and output (send weighted to each time as it is sent), and the waveform switching at the time of timbre switching reduces the number of simultaneous sounds You will be able to do it smoothly.

  As another form of waveform switching, the sound generation start may be a sound generation start of a preceding sound in a portamento performance, and the waveform change may be a waveform switch to an arrival sound in a portamento performance. .

  That is, the first reading means starts loop reading of the repeated portion, and the second reading means reads the waveform of the rising portion or the repeating portion of the next musical sound waveform, and the above processing is performed to generate the preceding sound. By repeating this process repeatedly from the start to the arrival sound in the portamento performance, the waveform can be switched smoothly during portamento without reducing the number of simultaneous sounds.

  Further, as shown in an embodiment described later, as another aspect of waveform switching, the sound generation start is sound generation start in a non-resonant state, and the waveform change is waveform switching to a resonance state, or the sound generation It is also proposed as the present invention that the start is the start of sound generation in a resonance state, and the waveform change is a waveform switch to a non-resonance state.

  That is, when the first reading means starts loop reading of the repetitive portion, the waveform reading is switched to the second reading means, and at least the repetitive portion of the tone waveform different from the first tone waveform is read. For example, when there is another keystroke having a resonance relationship with the first musical sound waveform in loop reading, the repetitive portion of the musical sound waveform having the resonance relationship is read and the above processing [from the above two reading means] The above-mentioned weighting means that received the outputs in order crossfades the output of the first received and the output of the later received and outputs the result (weighting is given to each as time passes) ], The waveform can be switched smoothly when there is another keystroke in a resonance relationship without reducing the number of simultaneous sounds.

  According to the configuration of the present invention as described above, when the first reading unit starts to read the repetitive portion and is released from the reading of the rising portion, the second reading unit has a separate (different musical tone waveform). The weighting means that repeatedly reads at least the repetitive portion and receives the outputs from the two reading means in order cross-fades the output that is received first and the output that is received later, and outputs the result ( Therefore, it is possible to obtain an excellent effect that the waveform can be switched smoothly without reducing the number of simultaneous sounds.

  Hereinafter, an embodiment of an electronic musical tone generator according to the present invention will be described.

  FIG. 1 shows a circuit block configuration of an electronic piano equipped with an electronic musical tone generator according to an embodiment of the present invention, and FIG. 2 shows a tone generator (ToneGenerator) 2 as an electronic musical tone generator shown therein. FIG. 3 is a block diagram showing the entire circuit configuration of the sound source 2, and FIG.

  In FIG. 1, a system bus 102 controls each circuit connected thereto by a CPU 104 (to be described later) to function as an electronic piano.

  The ROM 106 stores a program memory (not shown) for storing a program used in the CPU 104 described later and various necessary data.

  The RAM 108 temporarily stores various parameters and data generated in the control by the CPU 104. In particular, there are a loop counter i, a resonance availability table RES [i], and registers related to various acoustic effects of each timbre series TRK, which will be described later, and the state is referred to or updated as will be described later.

  The interface (I / F) 110 is an input / output interface for a panel scan circuit 112a and a keyboard scan circuit 114a, which will be described later, in addition to a MIDI input / output interface, and controls input / output of data and commands to the system bus 102.

  The electronic piano is provided with an operation panel 112, a keyboard 114, and the like. The operation panel 112 is provided with a tone color switch for selecting a tone color of a musical tone to be generated, a switch for effect setting such as portamento, and the like. Information set from the operation panel 112 is scanned by the panel scan circuit 112a. , The set value is detected and supplied to the CPU 104 via the interface 110 and the system bus 102 to which the interface 110 is connected.

  The keyboard 114 is composed of an 88-key keyboard, and each key is provided with a keyboard sensor (not shown) composed of a touch sensor. The keyboard sensor detects a performance operation performed by the performer on the keyboard 114, and displays various performance information as key press information (including information such as key press timing (key ON) and key release timing (key OFF)). Output. These data are detected by the keyboard scan circuit 114a, and a key map KMP is created from the data, and the data is supplied to the CPU 104 via the interface 110 and the system bus 102 to which the key map KMP is connected.

  The CPU 104 executes the program read from the ROM 106, thereby controlling the circuits connected by the system bus 102 as an electronic piano as a whole, and a sound source (electronic musical sound generator of the present invention described later) Tone Generator) 2 issues a control command. Further, the CPU 104 determines whether or not the musical sound that is simultaneously key-on is in a resonance relationship, determines whether there is a timbre change on the operation panel 112, and similarly, portamento, monophony, etc. on the operation panel 112. Whether the effect (sound effect) is set or not is determined, and various instructions associated with the determination are output to the sound source 2.

  As shown in FIG. 2, the tone generator 2 has tone generator source modules 20a to 20n having n channels that are time-division controlled to perform a plurality of sounds simultaneously, and waveforms by the tone generator source modules 20a to 20n. For the musical sound data (L-Out, R-Out) read out from the memory 1 and output from the CPU 104, each sound effect (L-Send, R-Send) corresponding to them is received. The effect processor 26 adds each sound effect to the musical sound data (L-Out, R-Out).

  More specifically, the sound source 2 includes n sound source source modules 20a to 20n corresponding to n channels, and musical sound waveforms read from the waveform memory 1 via the bus 10 are stored for up to n channels. Output (L-Out, R-Out), and the sound effects (L-Send, R-Send) such as portamento, monophony, resonance, etc. output from the CPU 104 are also output. Each output (L-Out, R-Out) is accumulated by adders (22a, 22b, ˜22an, 22bn) and sent to the effect processor 26. Each acoustic effect (L-Send, R-Send) such as portamento, monophony, and resonance is also accumulated by adders (24a, 24b, ˜24an, 24bn) and sent to the effects processor 26 as well. The effect processor 26 adds each acoustic effect corresponding to the addition output of the above musical sound waveform, mixes n channels as a musical sound waveform to which such acoustic effect is added, and outputs it to the outside (MixedL, MixedR). ).

  FIG. 3 is a block diagram showing an internal configuration of each of the sound source modules 20a to 20n shown in FIG. The first sound source module 20 includes a first digitally controlled oscillator 3 and a first loop buffer 3a corresponding to first reading means to be described later, and a second digitally controlled oscillator corresponding to second reading means. 4 and a second loop buffer 4a, a cross fader 5 corresponding to weighting means, a digital controlled filter 6a corresponding to modulation means, a digital controlled amplifier 6b, and a pan / loud control 6c. In the sound source source module 20 assigned as one of the channels, a musical tone waveform corresponding to a waveform memory 1 (to be described later) is read out based on the set tone color by a key pressing operation, and pressed in the assigned channel. A musical sound corresponding to the key operation is generated.

  As described above, the tone waveform output from each channel is subjected to pre-accumulation effect processing such as portamento, monophony, resonance, etc. in each channel before accumulation by a method described later. 22a, 22b to 22an, 22bn) and supplied as a direct sound (dry musical sound) to the first input of the effects processor 26, while each adder (24a, 24b, ~ 24an, 24bn) Each channel is accumulated and supplied as an indirect sound (wet musical sound) to the second input of the effect processor 26. Thus, as described above, the effect processor 26 adds the corresponding accumulated acoustic effects (chorus, reverb, echo, etc.) to the musical sound waveform cumulative calculation force, respectively. As a musical sound waveform to which an acoustic effect is added, n channels are mixed and output to the outside.

  As will be described later, when the musical sound waveform is read out, the portion that is repeatedly read in a loop is the first read-out, and the repeated portion is a first or second, which will be described later, separately from the waveform memory 1. The loop buffer 3a or 4a is buffered and repeatedly read out until the musical tone generation is finished to generate a musical tone. On the other hand, access to the waveform memory 1 via the bus 10 is released, so that the next musical tone is released. When the waveform can be read out and the CPU 104 determines that the sound read out by the next key operation is in a resonance relationship with the previous musical tone, the reading of the musical sound waveform in the resonance relationship between the two musical tones is performed. And so on. In addition, even when there is a tone change or portamento setting, etc., it will be in accordance with the following explanation (when there is a judgment of tone change or effect setting such as portamento (pre-accumulation effect) setting, The tone waveform corresponding to it is read out).

  The sound source 2 performs delay processing (digital filtering processing) using the delay RAM 116 shown in FIG. 1 as necessary, and further converts it into an analog signal by a DA converter (DAC) 118, and then an amplifier 120. The sound is amplified to the outside as an output of the electronic piano from the speaker 122.

The waveform memory 1 is a storage element for storing various musical sound waveforms including at least timbre data. The musical sound waveform is read out once and processed and processed and processed in an electronic piano. Musical sound waveform data is stored, including the sound waveform of the rising part used for sound generation, and the sound waveform of the repeated part that is repeatedly read and processed for sound generation of an electronic piano. Yes. Also, such as C ₃ and C _4, resonances if sound is mutual resonance relationship, resonance, such as C ₄ has been C ₃ tone waveform resonance, or tone waveform of C ₄ that are resonance C ₃ The sound waveform is also stored.

  According to the sound source 2, via the bus 10, stored in the waveform memory 1, according to timbre settings, or corresponding to various effects (acoustic effects), 1 pure tone (non-resonant sound) and 2 or more Various musical sound waveforms corresponding to the resonance sound are read out. At this time, a musical sound waveform that becomes a repetitive portion is buffered in a loop buffer 3a or 4a, which will be described later, corresponding to the first or second reading means, and is also digitally controlled corresponding to the first or second reading means. The oscillator 3 or 4 loops and reads out the tone until the tone generation is completed, and a tone signal is generated in one channel based on the read tone waveform.

  The musical tone signals output from the two reading means are cross-faded by the cross fader 5 corresponding to the weighting means that receives them in order, the output of the first received and the output of the later received one. Is output.

  Thereafter, the amplitude, cutoff frequency, stereo localization, volume, etc. of the output signal from the crossfader 5 are controlled by the digitally controlled filter 6a, the digitally controlled amplifier 6b and the pan / loud control 6c corresponding to the modulation means. These are modulated in accordance with the musical tone parameters given to them to generate musical tones, and the output signals of all the plurality of channels are accumulated and output.

  That is, the configuration of the sound source 2 can read out two or more musical sound waveforms simultaneously for each of a plurality of time-division time slots via the bus 10 to the waveform memory 1 as shown in FIG. An electronic musical tone generator capable of generating a plurality of musical tones in the time-division time slot, wherein the first digital control reads out from one rising portion to a repeating portion of the musical tone waveform in the time-division time slot. A second digitally controlled device that reads out at least a repetitive portion of a first sound reading unit composed of the oscillator 3 and the first loop buffer 3a and a tone waveform different from the tone waveform read by the first read unit; A second reading means comprising an oscillator 4 and a second loop buffer 4a; and the first and second reading means. Generates a musical sound by receiving the read musical sound waveform, assigning weights to each of them as time elapses, and transmitting the weighted means composed of the crossfader 5, and adding the above modulation to the signal transmitted by the weighting means. And a modulation means comprising a digitally controlled filter 6a, a digitally controlled amplifier 6b, and a pan / loud control 6c.

  The digitally controlled oscillators 3 and 4 are internally provided with a wave lead unit WRU (not shown), and a musical sound waveform is read from the waveform memory 1 based on a wave clock WCK (not shown). The musical sound waveform read from there is sent from the selector SEL (not shown) to the wave lead unit WRU and output to the outside as a waveform signal.

  At this time, when the CPU 104 is informed that the top of the repetitive portion in the musical sound waveform (the loop top excluding the rising portion) has been applied, the wave lead unit WRU sends the sound waveform of the repetitive portion to the loop buffer 3a or 4a. When the CPU 104 informs the end of the repetitive portion (loop end), the wave lead unit WRU stops the transfer of the musical sound waveform. Then, when the musical sound waveform read from the waveform memory 1 has a repeated portion thereafter, the selector SEL switches to reading from the loop buffer 3a or 4a instead of reading from the waveform memory 1 and outputs a waveform signal. However, the next musical sound waveform readout process is further performed.

  The crossfader 5 is configured to gradually fade in and output the next signal while gradually fading out the previously output signal with respect to the two outputs from the digitally controlled oscillators 3 and 4. . For this purpose, each signal is sent with a weight given to each signal as time elapses (for example, a weight that is inversely proportional to both signals).

  The digitally controlled filter 6a is composed of an IIR filter (not shown), and cuts overtone components other than a predetermined frequency band at a cutoff frequency OFS given by an offset value. In the figure, reference numeral 60 denotes an envelope generator for generating a cutoff frequency for the digital controlled filter 6a.

  The digitally controlled amplifier 6b multiplies the input waveform signal by the amplitude envelope from the envelope generator 62, adjusts the amplitude of the waveform signal, and outputs it.

  The pan / loud control 6c controls the stereo position and volume of the input musical sound waveform according to the musical sound parameters, and accumulates and outputs the output signals subjected to the control of all the plurality of channels. .

  After that, as described above, the delay RAM 116 is used for delay processing as described above, and after being converted into an analog signal by the digital-analog converter (DAC) 118, it is amplified by the amplifier 120. Then, the sound is emitted from the speaker 122 to the outside as the output of the electronic piano.

FIG. 4 (a) shows that in the electronic piano having the above-described configuration, the key depression operations of C ₃ and C ₄ which are different in octave and in resonance relation with piano tone are in a state slightly shifted in time. The key press instruction for both sounds arrives at the sound source 2 and the tone waveform is read out in the channel for C ₃ and the channel for C ₄ while each tone waveform is temporarily in resonance. It is a wave form diagram which shows the state output.

The channel for C _3, with the key-on of C _3, the digital controlled-oscillator 3 corresponding to the first read means, the waveform of rising portion of the C ₃ is read out, followed by repeating part of the reading is made, at that time At the same time, the musical tone waveform stored in the first loop buffer 3a is read out from the first loop buffer 3a. Immediately after key-on of C _3, since no ringing other sounds, the chord key-on of C ₃ is pronounced in a state that is not affected by other sounds.

In this state, when the next C ₄ key pressing operation (key-on occurrence) occurs, the string that is sounding C ₃ is affected by the sound of C ₄ , and the tone waveform of only C ₃ that has been played so far. In addition to this, a resonance sound influenced by C ₄ is generated. Waveform tailored this is a C ₃ + C _4, the musical sound waveform by digital Controlled oscillator 4 corresponding to the second reading means, as shown in FIG. 4 (b), the rise of the C ₃ + C ₄ The waveform of the portion is read, and then the repeated portion is read. At the same time, the waveform is stored in the second loop buffer 4a, and thereafter, the tone waveform of the repeated portion is read from the second loop buffer 4a. .

On the other hand, in the waveform reading in the channel for C ₄ that is key-on slightly shifted, the string of the musical tone C ₄ generates its own musical tone as it is. The waveform showing this is the waveform diagram of C ₄ depicted on the right side of FIG. 4A, and further, even if there is a C ₃ key release, it does not change, only C ₄ . and it remained tone waveform, finally decays with the key-release of C _4.

The channel for C ₄ in this case, the key-on of C _4, the digital Controlled Oscillator 3 corresponding to the first readout means, the waveform of the repeating portion of the C ₄ is read out, at the same time at that time, the first loop The musical sound waveform is stored in the buffer 3a, and thereafter, the repetitive portion of the musical sound waveform is read from the first loop buffer 3a.

In this state, even if there is a previous C ₃ key-off, a musical sound is generated based on the musical sound waveform of C ₄ that has been sounding so far. The musical sound waveform is read out by the digitally controlled oscillator 4 corresponding to the second reading means, and the repetitive portion of C ₄ is read out at the same time and stored in the second loop buffer 4a. Reading of the musical sound waveform is performed from the second loop buffer 4a. Is only tone from the first C ₄ only, since no ringing other sounds, strings C ₄ is pronounced in a state that is not affected by other sounds.

As described above, FIG. 4 (b), in the channel for C _3, pronunciation C ₃ + C _4, shows a state where the realization of the present invention. That is, the two digitally controlled oscillators 3 and 4 of FIG. 3 are assigned to the first DCO = C ₃ and the second DCO = C ₃ + C ₄ , respectively, and when the C ₄ key is turned on, the digital controlled oscillator 6 a corresponding to the modulation means is passed. It shows that the waveform signal is switched from C ₃ to C ₃ + C ₄ .

In this way, when the next key press information is output while the previous musical tone is sounding, if the CPU 104 determines from the next key press information that there is a resonance relationship with the previous musical tone, C _In the channel ₃ , the tone waveform C ₃ + C _{4 in} the resonance state of the previous tone and the next tone is read by the digitally controlled oscillator 4. In the same manner as described above, the musical sound waveform that becomes a repetitive portion is buffered in the loop buffer 4a, and is read out in a loop by the digitally controlled oscillator 4 until the generation of the musical sound is completed. A musical tone signal is generated based on the musical tone waveform data.

The key depression of the first C ₃ is completed, there is no output of the key release has been tone waveform of C _3, the channel for C _4, key depression information on the next C ₄ is continuously output In the meantime, the next musical tone waveform C ₄ is read out by the digitally controlled oscillator 4 in accordance with an instruction from the CPU 104. Similar to the above, the tone waveform to be repeated portions, are buffered in the loop buffer 4a, the digital Controlled oscillator 4, the tone of C ₄ is read out in a loop until the end of the channel for the C ₄ Thus, a musical sound signal is generated based on the read musical sound waveform C ₄ .

  5-17 is a flowchart which shows the processing flow in this electronic piano.

  FIG. 5 is a flowchart showing a main processing flow of the electronic piano. As shown in the figure, when the power is turned on, first, each part of FIG. 1 is initialized (step S100). Then, it is checked whether there is an event (step S102).

  If there is no event (step S102; N), the routine proceeds to step S106, which will be described later. On the other hand, if there is an event (step S102; Y), event processing is executed (step S104), and then the routine proceeds to steady processing (step S106).

  FIG. 6 is a flowchart showing a process flow of the event process in step S104 of FIG. As shown in the figure, first, it is checked whether or not the event is a key pressing event (step S200). If the event is a key pressing event (step S200; Y), the process proceeds to a key pressing process (step S202).

  On the contrary, if the event is not a key pressing event (step S200; N), it is checked whether or not the event is a key release event (step S204).

  If the event is a key release event (step S204; Y), the process proceeds to a key release process (step S206).

  On the other hand, if the event is not a key release event (step S204; N), it is checked whether the event is a timbre event for selecting a timbre (step S208). If the event is a timbre event (step S208; Y), the process proceeds to timbre processing (step S210).

  On the contrary, if the event is not a timbre event (step S208; N), it is checked whether or not the event is a portamento event for performing a portamento process (step S212). If the event is a portamento event (step S204; Y), the process proceeds to portamento processing (step S214).

  On the contrary, if the event is not a portamento event (step S212; N), it is checked whether or not the event is a monophony event for performing monophony processing (step S216). If the event is a monophony event (step S216; Y), the process proceeds to monophony processing (step S218).

  On the contrary, if the event is not a monophony event (step S216; N), other processing is executed (step S220).

  FIG. 7 is a flowchart showing a process flow of the key pressing process in step S202 of FIG. As shown in the drawing, first, it is checked whether or not the monophony of the corresponding timbre series TRK among the sound source modules 20a to 20n is in an ON state (step S300). If the monophony of the corresponding timbre series TRK is in the ON state (step S300; Y), the process proceeds to a mono sound generation process to be described later (step S318).

  On the contrary, if the monophony of the corresponding timbre series TRK is not in the ON state (step S300; N), the value of the key number KNO in the key map KMP is rewritten to ON (step S302).

  Thereafter, the process proceeds to a normal sound generation process to be described later (step S304). Then, “0” is set to the loop counter i (step S306).

  Further, the difference between the key number KNO of the pressed key and the loop variable i is taken and substituted into the temporary variable j (step S308).

  Further, it is checked whether or not the resonance availability table RES [j] is in an ON state (step S310).

  If the resonance availability table RES [j] is not in the ON state (step S310; N), the process proceeds to step S316 described later.

  On the other hand, if the resonance availability table RES [j] is in the ON state (step S310; Y), it is checked whether the key i is in the ON state on the key map KMP (step S312). If the key i is not in the ON state on the key map KMP (step S312; N), the process proceeds to step S316 described later.

  On the other hand, if the key i is in the ON state on the key map KMP (step S312; Y), the resonance sound corresponding to the key number KNO is additionally generated by the sound source module 20 that is generating sound corresponding to the key i. That is, a resonance sounding process is performed (step S314).

  Then, 1 is added to the loop counter i (incremented), and it is checked whether or not the value has reached the maximum value KMAX (for example, 128) of the key number KNO (step S316). If not reached (step S316; N), the difference between the key number KNO of the pressed key and the loop variable i is taken, and the process returns to the temporary variable j (step S308) to return to the above process. repeat. On the contrary, if it has reached (step S316; Y), the routine proceeds to the steady process of step S106 of the main routine.

  FIG. 8 is a flowchart showing the normal sound generation processing flow of step S304 of FIG. First, both the two digitally controlled oscillators 3 and 4 are searched for (unused) free sound source module 20 (step S400).

  Next, the sound generation data is stored in an assignment memory (not shown), and the sound generation data corresponding to the key depression is assigned to the first digitally controlled oscillator 3, and at the same time, the second digitally controlled oscillator 4 is made empty. (Step S402).

  Then, the data is transferred to the sound source 2 (step S404).

FIG. 9 is a flowchart showing the resonance sound processing flow of step S314 in FIG. First, the sound source module that is sounding is searched for corresponding to the key (C _{3 in} the example of FIG. 4) when step S314 is called, and the free digitally controlled oscillator 3 or 4 of the source module is searched. Is acquired (step S500). The structure of the resonance sound so far (C _{3 in} the example of FIG. 4) is acquired (step S502). Depressed key of the key numbers KNO (in the example of FIG. 4, C ₄₎ resonance tone data of intervals corresponding to is added to the resonance tone data of the assignment memory (not shown) (step S504).

Further, tone data matching the resonance sound data (C ₃ + C _{4 in} the case of FIG. 4) is read and assigned to the digitally controlled oscillator 3 or 4 side where the sound generation data is free (step S506). Further, the previous sound generation data remains on the other (previous) digitally controlled oscillator 4 or 3 side.

  The CPU 104 outputs an instruction for crossfading to the sound source 2 from the previous digitally controlled oscillator 4 or 3 side to the digitally controlled oscillator 3 or 4 side to which the resonance sound data is assigned, and the data transfer Is performed (step S508). After the above processing, the process proceeds to step S316 in FIG.

  FIG. 10 is a flowchart showing a process flow of mono sound generation in step S318 of FIG. First, 0 is set to the value of the loop counter i (step S600), and it is checked whether or not the key map KMP of the key number i is in an ON state (step S602). If the key map KMP of the key number i is not in the ON state (step S602; N), the process proceeds to step S612 described later.

  On the other hand, if the key map KMP of the key number i is in an ON state (step S602; Y), the sound source module 20 that is sounding corresponding to the key number i is searched, and if the sound source module is found, the key map KMP is found. The state of the other key is rewritten to OFF, and the value of i is changed to the maximum value-1 (for example, 127) (step S604).

  A free digitally controlled oscillator 3 or 4 is acquired (step S606). The pronunciation data is stored in an assignment memory (not shown), and the pronunciation data corresponding to the key depression is assigned to the empty digitally controlled oscillator 3 or 4 (step S608).

  It is checked whether or not the portamento of the corresponding timbre series TRK among the sound source modules 20a to 20n is in an ON state (step S610). If the portamento of the corresponding timbre series TRK is in the ON state (step S610; Y), the crossfade speed and the pitch transition speed (XFD) are set to slow (step S612), and conversely, the portamento of the corresponding timbre series TRK. If is not ON (step S610; N), the crossfade speed and the pitch transition speed (XFD) are set to fast (step S614).

  Then, 1 is added to the loop counter i (incremented), and it is checked whether or not the value has reached the maximum value KMAX (for example, 128) of the key number KNO (step S616). If not reached (step S616; N), the process returns to the process of setting the value of the loop counter i to 0 (step S600), and the above process is repeated. On the contrary, if it has reached (step S616; Y), the routine proceeds to the steady process of step S106 of the main routine.

  FIG. 11 is a flowchart showing the process flow of the key release process in step S206 of FIG. First, the value of the key number KNO in the key map KMP is rewritten to OFF (step S700), and normal mute processing is performed (step S702).

  FIG. 12 is a flowchart showing the normal mute processing flow in step S702 of FIG. First, the sound source module 20 that is sounding corresponding to the key number i is searched (step S800).

  Thereafter, the mute data is stored in the assignment memory, and the key-released envelope is acquired (step S802). Then, data is transferred to the searched sound source source module 20 (step S804).

  FIG. 13 is a flowchart showing the processing flow of the timbre processing in step S210 of FIG. First, among the sound source modules 20a to 20n, the timbre number of the corresponding timbre series TRK is updated and set (step S900). Then, it is checked whether or not the timbre of the key being pressed is a timbre that is re-sounded to the timbre after switching (step S902). If the timbre of the key being pressed is not a timbre that is re-sounded to the timbre after switching (step S902; N), the process proceeds to step S906 described later.

  On the other hand, when the tone color of the key being pressed is a tone color that is re-sounded to the tone color after switching (step S902; Y), a re-sounding process described later is executed (step S904).

  Thereafter, the resonance availability table RES [i] is changed according to the tone color (step S906).

  FIG. 14 is a flowchart showing the process flow of the re-sounding process in step S904 of FIG. First, 1 is set to the variable i of the loop counter (step S1000), and it is checked whether or not the key map KMP of the key number i is in the key depression state (step S1002).

  If the key map KMP of the key number i is not in the depressed state (step S1002; N), the process proceeds to step S1010 described later.

  On the other hand, if the key map KMP of the key number i is in the depressed state (step S1002; Y), the vacant digitally controlled oscillator 3 or 4 is acquired (step S1004).

  Then, sound generation data of a new tone color is acquired and assigned to a free digitally controlled oscillator 3 or 4 (step S1006). However, the waveform read data uses a loop top point instead of the start point.

  Thereafter, data transfer is performed in the sound source 2, and a crossfade from the previous digitally controlled oscillator to the resonant digitally controlled oscillator is executed (step S1008).

  Then, 1 is added (incremented) to the loop counter i, and it is checked whether or not the value has reached the maximum value KMAX (for example, 128) of the key number KNO (step S1010). If not reached (step S1010; N), the process returns to the check process (step S1002) for checking whether or not the key map KMP of the key number i is in the depressed state, and the above process is repeated. If it has reached the opposite (step S1010; Y), the process proceeds to a process in which the resonance availability table RES [i] in step S906 in the timbre process of FIG. 13 is changed according to the timbre.

  FIG. 15 shows Pol. In step S214 of FIG. It is a flowchart which shows the processing flow of a process (portamento process). First, it is checked whether or not portamento is in an ON state in the corresponding timbre series TRK (step S1100). In the corresponding timbre series TRK, when portamento is in the ON state (step S1100; Y), the portamento of the corresponding timbre series TRK is inverted to OFF (step S1102).

  On the other hand, if the portamento is not in the ON state in the corresponding timbre sequence TRK (step S1100; N), the portamento of the corresponding timbre sequence TRK is inverted to ON (step S1104), and whether the corresponding timbre sequence TRK is a single tone sequence. It is checked whether or not (step S1106).

  When the corresponding timbre series TRK is a single tone series (step S1106; Y), the routine proceeds to the steady process of step S105 in FIG. On the contrary, if the corresponding tone color sequence TRK is not a single tone sequence (step S1106; N), the corresponding tone color sequence TRK is converted into a single tone sequence, and all keys are muted (step S1108). Then, in the same manner as described above, the routine proceeds to step S105 in FIG.

  FIG. 16 shows Mon. in step S218 in FIG. It is a flowchart which shows the processing flow of a process (monophony process). First, it is checked whether or not monophony is ON in the corresponding timbre series TRK (step S1200). When the monophony is not in the ON state in the corresponding timbre series TRK (step S1200; N), the monophony of the timbre series TRK is inverted to ON (step S1204), and the process proceeds to the steady process of step S105 in FIG.

  On the contrary, if the monophony is ON in the corresponding timbre series TRK (step S1200; Y), the monophony of the corresponding timbre series TRK is inverted to OFF and all keys are muted (step S1202).

  Then, in the corresponding timbre series TRK, it is checked whether portamento is in an ON state (step S1206). If the portamento is not in the ON state in the corresponding timbre series TRK (step S1206; N), the routine proceeds to the steady process of step S105 in FIG.

  On the other hand, if the portamento is in the ON state in the corresponding timbre series TRK (step S1206; Y), the portamento in the corresponding timbre series TRK is inverted to OFF (step S1208). And it transfers to the steady process of step S105 of FIG.

  FIG. 17 is a flowchart showing the process flow of the steady process in step S105 of FIG. First, the sound source module 20 whose attenuation envelope has already sufficiently approached zero is set to be empty (described here as a sound generation end process; step S1300).

  The pitch transition of the sound source module 20 in which portamento is on is advanced (step S1302).

  Subsequently, a volume update process (step S1304), a localization update process (step S1306), an envelope phase update process (step S1308), and other update processes such as a modulation transmitter (LFO) are executed ( In step S1310), the process returns to step S102 in FIG. 5 and the subsequent processing is repeated.

In the embodiment described above in detail, while the previous musical sound (for example, C ₃ ) is being played (during this time, the loop portion of the previous musical sound is stored in the loop buffer, and the bus 10 accessing the waveform memory 1 is connected to the sound source source. When the next key press information (for example, C ₄ ) is output when the next key press information (for example, C ₄ ) is output, if the CPU 104 determines that there is a resonance relationship with the previous musical tone, _In the channel ₃ , the musical sound waveform C ₃ + C _{4 in} the resonance state of the previous musical tone and the next musical tone is waveform-controlled by the digitally controlled oscillator 3 via the bus 10 at the timing of the sound source module. Read from. In the same manner as described above, the musical sound waveform that becomes a repetitive portion is buffered in the loop buffer 3a, and is read out in a loop by the digitally controlled oscillator 3 until the generation of the musical sound is completed. A musical tone signal is generated based on the musical tone waveform data. That is, since the timing of the other sound source modules is not affected, the sound can be switched from a non-resonant tone to a resonant tone without reducing the number of simultaneous sounds.

That is, the digital Controlled Oscillator 3 and loop buffer 3a corresponds to a first readout means, one of the channels, the reading of the rising portion of the musical tone waveform to start based on the start of sounding the tone of C _3, then repeatedly moves to parts of the read, and in the key depression timing of C _4, the digital controlled oscillator 4 and the loop buffer 4a correspond to the second reading means, said digital control based on a waveform change of the musical tone the sound start By starting to read at least the repetitive portion of the resonance music sound waveform C ₃ + C ₄ different from the sound sound waveform C ₃ read by the oscillator 3 and the loop buffer 3a, the resonance sound waveform from the non-resonance sound waveform is changed to the resonance sound waveform. As you can see, it can be used for waveform switching. It becomes possible corresponding to the waveform switching without inhibiting timing.

  In addition to the waveform switching mode as described above, as another mode of waveform switching, it can be assumed that the waveform change is based on a player's tone color switching instruction.

  That is, the digitally controlled oscillator 3 corresponding to the first reading means and the loop buffer 3a start reading the repeated portion following the reading of the rising portion, and start the loop reading of the repeated portion, and the digitally controlled oscillator 4 corresponding to the second reading means. The loop buffer 4a reads out the waveform of the rising or repeating portion of the next musical sound waveform having different timbres, whereby two or more musical sound waveforms having different timbres associated with the timbre switching operation can be read out. The cross fader 5 corresponding to the weighting means that received the outputs from the means in turn cross-fades the output of the first received and the output of the later received and outputs it (each as time elapses). Waveform at the time of timbre switching Exchange, but it will be able to smoothly without decreasing the number of simultaneous pronunciation.

  As another mode of waveform switching, the sound generation start may be the sound generation of the preceding sound in portamento performance, and the waveform change based on portamento may be the waveform switching to the arrival sound in portamento performance. It is.

  That is, the digitally controlled oscillator 3 and the loop buffer 3a corresponding to the first reading means start the loop reading of the repeated part following the reading of the rising part, and the digitally controlled oscillator corresponding to the second reading means. 4 and the loop buffer 4a read out the waveform of the rising portion or the repeating portion of the next musical sound waveform, and repeat the processing from the start of the preceding sound to the arrival sound in the portamento performance, By alternately performing between the first reading means and the second reading means, the waveform switching during portamento can be smoothly performed without reducing the number of simultaneous sounds.

  The monophony processing is also executed in the same manner as described above when the next key depression is performed before the previous sound release.

  It should be noted that the electronic musical tone generator of the present invention is not limited to the illustrated example described above, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

  The electronic musical sound generating device of the present invention can edit musical sounds as long as electronic musical sounds are generated regardless of an electronic musical instrument, and switching can be performed musically as if it were related to video morphing. Application to an apparatus or the like is also possible.

It is a circuit block diagram which shows the circuit block structure of the electronic piano which equipped the electronic musical tone generator which concerns on one Embodiment of this invention. It is a block diagram which each shows the circuit structure of the sound source 2 as an electronic musical sound generator including the sound source module 20a-20n. It is a block diagram which shows the internal structure of each sound source module 20a-20n. It is a wave form diagram which shows the state which the sound in resonance relation was output from each channel in the state which shifted | deviated a little in time in this electronic piano. It is a flowchart which shows the main process flow of this electronic piano. It is a flowchart which shows the processing flow of the event process of step S104 of FIG. It is a flowchart which shows the processing flow of the key pressing process of step S202 of FIG. It is a flowchart which shows the processing flow of the normal sound generation of step S304 of FIG. It is a flowchart which shows the resonance flow of the process of step S314 of FIG. It is a flowchart which shows the processing flow of the mono sound production | generation of step S318 of FIG. It is a flowchart which shows the processing flow of the key release process of step S206 of FIG. It is a flowchart which shows the process flow of the normal mute of step S702 of FIG. It is a flowchart which shows the processing flow of the timbre process of step S210 of FIG. It is a flowchart which shows the processing flow of the re-sounding process of step S904 of FIG. In step S214 of FIG. It is a flowchart which shows the processing flow of a process (portamento process). In step S218 of FIG. It is a flowchart which shows the processing flow of a process (monophony process). It is a flowchart which shows the process flow of the steady process of FIG.5 S105. It is a functional block diagram of a conventional configuration.

DESCRIPTION OF SYMBOLS 1 Waveform memory 2 Sound source 3, 4 Digitally controlled oscillator 3a, 4a Loop buffer 5 Crossfader 6a Digitally controlled filter 6b Digitally controlled amplifier 6c Pan / Loud control 10 Bus 20, 20a-20n Sound source module 22a, 22b, 22an, 22bn Adder 24a, 24b, 24an, 24bn Adder 26 Effect processor 60, 62 Envelope generator 100 Sound processing unit (SPU)
102 System bus 104 CPU
106 ROM
108 RAM
110 Interface 112 Operation Panel 112a Panel Scan Circuit 114 Keyboard 114a Keyboard Scan Circuit 116 Delay RAM
118 Digital-to-analog converter (DAC)
120 Amplifier 122 Speaker

Claims (6)

In an electronic musical sound generator capable of simultaneously reading out two or more musical sound waveforms for a plurality of time division time slots and capable of generating a plurality of musical sounds in the time division time slots,
During the time division time slot,
First reading means for reading from one rising portion to a repeating portion of the musical sound waveform;
Second reading means for reading at least a repetitive portion of a musical sound waveform different from the musical sound waveform read by the first reading means;
Weighting means for receiving the musical sound waveform read by the first and second reading means, assigning weights to each of them as time elapses, and sending them out;
An electronic musical sound generating apparatus characterized in that the plurality of musical sounds are generated by a modulating means for generating a musical sound by applying various modulations to the signal transmitted by the weighting means.   When the first reading means identifies that it has reached the beginning of the repeated portion when reading one of the musical sound data, the first reading means stores the read sound waveform of the repeated portion in the loop buffer and 2. The method according to claim 1, wherein when it is identified that the end has been reached, switching to the loop buffer is repeated until the generation of the musical sound is completed, and the reading of the musical sound data is switched to the second reading means. The electronic musical sound generator as described.   The first reading means starts reading the rising portion of the musical sound waveform based on the start of tone generation, and the second reading means is configured to change the first waveform based on the change in waveform of the tone that has started sounding. 3. The electronic musical sound generator according to claim 1, wherein reading of at least a repetitive portion of a musical sound waveform different from the musical sound waveform read by the reading means is started.   4. The electronic musical tone generator according to claim 3, wherein the waveform switching is based on a player's tone color switching instruction.   4. The electronic musical sound generator according to claim 3, wherein the sounding start is a sounding start of a preceding sound in a portamento performance, and the waveform change is a waveform switching to an arrival sound in a portamento performance. .   The sounding start is a sounding start in a non-resonant state, and the waveform change is a waveform switch to a resonance state, or the sounding start is a sounding start in a resonance state, and the waveform change is a non-resonant state. 4. The electronic musical tone generator according to claim 3, wherein the electronic musical tone generator is one of waveform switching.

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