JP3026479B2 - Music signal generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tone signal generating apparatus for reading a waveform data stored in advance and generating a tone signal.

[0002]

2. Description of the Related Art A tone generator (sound source) used in a recent electronic musical instrument is provided with a plurality of oscillators. When the plurality of oscillators are simultaneously driven in accordance with a tone generation instruction, a plurality of musical tones are generated simultaneously. It is possible.

[0003] In a natural musical instrument such as an acoustic piano, for example, the degree of tone change based on the difference in keystroke strength differs depending on the key range such as the high range, the middle range, or the low range. That is, the timbre changes greatly in accordance with the keystroke intensity in the low-tone range, and the timbre change according to the keystroke intensity decreases in the high-tone range. This is because the number of harmonics included in a musical tone in the low range greatly changes according to the keystroke strength, but the number of harmonics included in the musical tone does not increase as the keystroke intensity changes as the frequency increases. This is due to the characteristic of the natural musical instrument that it does not change, and the characteristic of the natural musical instrument that the decay rate of the musical tone in the low frequency range is small, but the decay rate increases as the frequency becomes higher.

Therefore, in order to simulate the characteristics of such a natural musical instrument and generate a musical tone having a tone corresponding to the key range and the keying strength,
Various attempts have been made. Generally, the tone color of a tone generated by a tone generator is determined by tone color data (for example, composed of waveform addresses, frequency data, envelope data, filter coefficients, and the like) given to an oscillator. However, there is a limit to the timbre that can be generated by giving such timbre data to one oscillator, and it has been difficult to generate a timbre according to the key range and the keystroke strength.

In an acoustic piano, for example, a string or soundboard as a sound source emits a three-dimensional musical sound over a certain range. On the other hand, in an electronic musical instrument, an electro-acoustic converter such as a speaker or a headphone is used as a sound emission source to emit a musical sound. Normally, one or several such sound sources are provided in one electronic musical instrument. However, since each sound source only emits the same musical sound, the musical sound becomes a flat plate and cannot generate a real musical sound. There was a problem.

Therefore, by simultaneously driving a plurality of oscillators to produce sounds simultaneously, it is possible to obtain a tone corresponding to a key range and a keystroke intensity, and to generate a more realistic musical sound by generating a musical sound in stereo. A tone generator that can be used has been developed.

[0007] Such a tone generator is constituted, for example, as follows. That is, as shown in FIG. 5, for example, as shown in FIG. 5, the waveform memory stores, for each key range (for each treble range, middle range, and low range), the waveform data of a strong strike component, a middle strike component, and a weak strike component. For the left channel and separately for the left channel. Then, when sounding is instructed, three oscillators are assigned to each of the left and right channels.

Each oscillator to which a sound is assigned selects one of the treble range, the middle range and the low range of the waveform memory in accordance with the keying position, and outputs a strong strike component and a middle strike range belonging to the selected tone range. Each of the waveform data of the component and the weak tap component is read, and the level (amplitude) of each waveform data is controlled according to the keying strength, the decay rate, and the like. This level control is performed by adding an envelope corresponding to the keying strength, the decay rate, and the like to the waveform data read from the waveform memory. Then, three tone signals based on the level-controlled waveform data are generated, and these are synthesized to generate a tone signal for one channel. Such a tone signal is generated for both the left and right channels.

Now, assuming that the maximum number (number of oscillators) that can be produced by the tone generator is "P", the division number of the range is "N", the division number of the keying strength is "M", and the number of channels is "C". The number of waveform data and the maximum number of simultaneous tones (polyphonic number) to be prepared by the tone generator configured as described above can be generally expressed as follows. Number of waveform data = N × M × C [waveform data] (1) Polyphonic number = P / (M × C) [sound] (2)

[0010]

In the above-described conventional tone generator, however, it is necessary to prepare waveform data in advance for each range, keystroke intensity, and channel, so that the amount of waveform data becomes enormous. It takes time and effort to create waveform data, and requires large-capacity storage means. Therefore, it is difficult to increase the division number “N” of the gamut, the division number “M” of the keying strength, and the like, and there is a problem that it is not possible to control the tone color finely.

On the other hand, high-frequency waveform data (striking component,
The difference in the frequency characteristics of the musical tone between the left and right channels is small, and even if the left channel and the right channel are separately prepared and sounded separately, the stereo spread feeling is almost unaffected. The Applicant has found that it does not contribute. However, in the conventional tone generator, three oscillators are always assigned to one sounding instruction regardless of the sound range, and sound is generated. Therefore, when sounding in a high frequency range, an oscillator that hardly contributes to the sense of spaciousness of the stereo is used. There is a problem that the oscillator is used wastefully because it is assigned to pronunciation. This can be considered that the originally achievable polyphonic number is reduced by wasteful use of the oscillator.

The present invention has been made in view of such circumstances, and it is possible to reduce the number of waveform data to be prepared in advance and to increase the number of polyphonics by efficiently using a limited number of oscillators. It is an object of the present invention to provide a tone signal generating device.

[0013]

According to a first aspect of the present invention, there is provided:
In order to achieve the above object, a tone signal generating apparatus for generating a tone signal for a plurality of channels includes a common waveform data generator for generating a tone in a specific range. And storage means for storing unique waveform data uniquely used in each channel to generate a musical tone in a range other than the specific range,
Sounding instructing means for instructing sounding, and storing the common waveform data from the storage means when the sounding instruction means instructs sounding in the specific range, and storing the common waveform data in the case where sounding in a sound range other than the specific range is instructed. Means for generating a tone signal by reading unique waveform data from the means.

A tone signal according to a second aspect of the present invention.
The generation device is provided with a plurality of oscillators for the same purpose as described above, and is used in a tone signal generation device that generates a tone signal for a plurality of channels. Storage means for storing waveform data and unique waveform data uniquely used in each channel to generate musical tones in a range other than the specific range, sounding instructing means for instructing sounding, and sounding instructing means. When the pronunciation of the specific range is instructed, the first number of oscillators are generated, and when the pronunciation of a range other than the specific range is instructed, the second number of oscillators greater than the first number are generated. And a first number of oscillators to which sounds are assigned by the assigning means read out common waveform data from the storage means and share the data with each channel. Wherein the second number of oscillators read out unique waveform data from the storage means and generate a tone signal unique to each channel. .

[0015]

According to the present invention, the waveform data of a specific tone range, for example, a high tone range has a small difference in the frequency characteristic of the musical tone between the left and right channels, and is generated separately based on the waveform data prepared for each channel. Are focused on the characteristic that they hardly contribute to the sense of spaciousness of the stereo.

That is, the tone signal according to the first embodiment of the present invention.
In the generation device , the storage means stores common waveform data commonly used in each channel to generate a musical tone in a specific range (for example, a high range) and a range other than the specific range (for example, a middle range and a low range). And the unique waveform data uniquely used in each channel to generate the musical tone. Then, when sounding instruction means such as a keyboard or a MIDI message or the like is instructed to sound a tone in a specific range, the common waveform data is read out to generate a tone signal, and tone generation in a tone range other than the specific range is instructed. In this case, the unique waveform data is read out to generate a tone signal.

Therefore, it is necessary for the storage means to prepare the waveform data of the sound range other than the specific sound range for each channel. However, the waveform data of the specific sound range is, for example, one type of data commonly used for each channel. (You may have more than one type). Accordingly, it is possible to reduce the amount of waveform data prepared in the storage means in advance, to save the time for generating the waveform data, and to reduce the capacity of the storage means for storing the waveform data. This means that if the storage capacity is the same, the number of divisions “N” of the gamut and the number of divisions “M” of the keying strength described in the section of the related art can be increased, and the fine tone Control can be performed.

A tone signal generating device according to a second embodiment of the present invention.
In the storage unit, the storage means stores common waveform data commonly used in each channel to generate a musical tone in a specific range (for example, a high range), and data of a range other than the specific range (for example, a middle range and a low range). Specific waveform data uniquely used in each channel to generate a musical tone is stored.
When a tone in a specific range is instructed by, for example, a keyboard or a MIDI message or the like, a tone is assigned to the first number of oscillators, and when a tone in a range other than the specific range is instructed, a tone is assigned to the first number of oscillators. The pronunciation is assigned to the number 2 oscillators. Here, the first number of oscillators and the second number of oscillators are arbitrary oscillators among a plurality of oscillators provided in advance in the musical sound signal generation device, and sound generation is performed according to a predetermined algorithm by, for example, a known assigner. Is assigned.

The first number of oscillators reads out the common waveform data from the storage means and generates a common tone signal for each channel. Therefore, for example, in an electronic musical instrument that sounds in stereo, the same tone signal is generated as the tone signal for both the left and right channels. Further, the second number of oscillators reads the unique waveform data from the storage means and generates a tone signal unique to the channel. Therefore, for example, in an electronic musical instrument that sounds in stereo, separate tone signals are generated for the left channel or the right channel.

Therefore, the present invention provides the following advantages in addition to the advantages of the tone signal generating apparatus according to the first aspect of the present invention, which can reduce the amount of waveform data prepared in advance in the storage means. Has advantages. That is, for example, in an electronic musical instrument that sounds in stereo, a first number of oscillators are assigned to generate musical tones in a specific range, and musical tone signals generated by these oscillators are used as musical tone signals for both left and right channels. As a result, it is possible to prevent a useless oscillator that does not contribute to the sense of spaciousness from being assigned to sound generation. This means that the number of polyphonics can be increased.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following embodiment, the tone generator (sound source) provided in the electronic musical instrument has 30 tone generators.
Assume that there are oscillators. However, in the present invention, the number of oscillators is not limited to 30.
It can be arbitrarily determined according to the scale of the electronic musical instrument, required specifications, and the like.

FIG. 1 is a block diagram showing a schematic configuration of an electronic musical instrument to which a tone signal generating apparatus according to the present invention is applied.

In the present electronic musical instrument, the system bus 20
Via a central processing unit (hereinafter, referred to as “CPU”).
10, a read only memory (hereinafter referred to as "ROM") 11, a random access memory (hereinafter referred to as "RA").
M ”. 12, a panel scan circuit 14, a touch detection circuit 16, and a tone generator 17 are interconnected. The system bus 20 is configured by a bus line for transmitting and receiving, for example, an address signal, a data signal, a control signal, and the like.

The CPU 10 corresponds to an assigning means, and controls each section of the electronic musical instrument according to a control program stored in the ROM 11. Details of the processing performed by the CPU 10 will be described later.

As described above, the ROM 11 has a CPU
In addition to storing the ten control programs, various fixed data used by the CPU 10 are stored. Also, this RO
M11 stores timbre data for generating a tone of a predetermined timbre for each timbre.

The RAM 12 temporarily stores various data processed by the CPU 10, and defines various registers, counters, flags, and the like for controlling the electronic musical instrument.

The panel scanning circuit 14 includes an operation panel 1
3 are connected. The operation panel 13 is a set of various controls for controlling the electronic musical instrument and switches that operate in conjunction with the controls. These switches include, for example, a tone selection switch, a rhythm selection switch,
It includes a volume control switch, a sound effect switch, and the like. The operation panel 13 is connected to the CPU 10 via a panel scan circuit 14 and a system bus 20.

The panel scan circuit 14 includes the operation panel 1
3 controls data transmission and reception between the CPU 3 and the CPU 10. That is, when the panel scan circuit 14 sends a scan signal to the operation panel 13, the operation panel 13
In response to the scan signal, a signal indicating the open / closed state of the switch (hereinafter, referred to as “panel data”) is returned to the panel scan circuit 14. The panel scan circuit 14
The panel data received from the operation panel 13 is transmitted to the CPU 10 via the system bus 20. This panel data is used to determine the presence or absence of a panel event (details will be described later).

The keyboard 15 is connected to the touch detection circuit 16. The keyboard 15 has a plurality of keys (in the present embodiment, 88 keys from note names A0 to C8 as shown in FIG. 2) for instructing a pitch. As the keyboard 15, for example, a two-contact keyboard is used. That is, each key of the keyboard 15 has two key switches that open and close in conjunction with key press / key release operations, and can detect key touches.
The keyboard 15 is connected to the CPU 10 via a touch detection circuit 16 and a system bus 20.

In this embodiment, as shown in FIG. 2, the keyboard 15 sets the range of pitch names A0 to B2 to a low range and the pitch name C3.
The range from B5 to B5 is defined as the middle range, and the range from pitch names C6 to C8 is defined as the high range.

The touch detection circuit 16 detects touch data indicating a note number and a key pressing speed of a key pressed or released. That is, the touch detection circuit 16
A scan signal is sent to the keyboard 15, and the keyboard 15 responds to the scan signal by the first and second scan signals.
The signal indicating the open / closed state of the key switch is returned to the touch detection circuit 16.

The touch detection circuit 16 detects the presence or absence of a key event and the type of the key event (ON event or OFF event) from the signal indicating the open / close state of the first and second key switches received from the keyboard 15. A signal is generated and sent to the CPU 10. Further, the touch detection circuit 16 receives the first and second
The key number detected or released from the signal indicating the open / closed state of the key switch is detected and sent to the CPU 10.

Further, the touch detection circuit 16 generates touch data indicating the key pressing speed by measuring the time from when the first key switch is turned on to when the second key switch is turned on. And sends it to the CPU 10. The technique of detecting a key touch is well known and will not be described in detail. For example, a technique described in Japanese Patent Application Laid-Open No. 3-171197 can be used.

The tone generator 17 is a sound source provided with, for example, 30 oscillators. The tone generator 17 includes a left channel tone generator 30, an envelope generator 31 for generating an envelope signal to be provided to the left channel tone generator 30, a right channel tone generator 32, and an envelope signal to be provided to the right channel tone generator 32. , And a waveform memory 40 storing waveform data read out by the left channel tone generator 30 and the right channel tone generator 32.

The waveform memory 40 corresponds to storage means, and is constituted by, for example, a ROM. The waveform memory 40 stores waveform data in a format as shown in FIG. 3, for example. That is, as low frequency range waveform data,
The waveform data of the strong hit component, the middle hit component, and the weak hit component are stored for both the left and right channels. Similarly, as the middle-tone-range waveform data, the waveform data of the strong-hit component, the middle-hit component, and the weak-hit component are stored for both the left and right channels. Further, as high-frequency-range waveform data, waveform data of a strong-hit component, a middle-hit component, and a weak-hit component is stored for one channel. Although FIG. 3 shows only waveform data corresponding to one tone color, the waveform memory 4
In 0, a plurality of waveform data of the above format is stored corresponding to each tone color.

The high frequency range waveform data stored in the waveform memory 40 is created, for example, as follows.
That is, the emitted musical tone is converted into an electric signal, which is subjected to pulse code modulation (PCM). The pulse code-modulated waveform data is passed through a high-pass filter to extract a musical tone waveform containing a plurality of overtones (for example, 13 or more harmonics) of a predetermined frequency or higher, to obtain original waveform data.
Next, the original waveform data is used as it is as the waveform data for the heavy strike component, and the original waveform data is passed through a low-pass filter, so that the number of harmonics limited to within a predetermined range is used as the waveform data for the medium strike component, and the number of harmonics is further increased. The limited data is used as the weak hit component waveform data. Since this data is shared by both the left and right channels, only three types of waveform data are created.

Similarly, the mid-range waveform data is created, for example, as follows. That is, the emitted musical tone is converted into an electric signal, and this is converted to a pulse code (PC code).
M). The pulse code-modulated waveform data is passed through a band-pass filter to extract a musical tone waveform including a plurality of overtones (for example, 6 to 12 harmonics) in a predetermined frequency range to obtain original tone data for the mid-range. Next, the original waveform data is used as it is as the waveform data for the heavy strike component, and the original waveform data is passed through a low-pass filter, so that the number of harmonics limited to within a predetermined range is used as the waveform data for the medium strike component, and the number of harmonics is further increased. The limited data is used as the weak hit component waveform data. This operation is performed for both the left and right channels to create a total of six types of waveform data.

Similarly, waveform data for the low frequency range is created, for example, as follows. That is, the emitted musical tone is converted into an electric signal, and this is converted to a pulse code (PC code).
M). The pulse code modulated waveform data is passed through a low-pass filter to extract a tone waveform including a plurality of overtones (for example, a fundamental tone to a fifth harmonic) of a predetermined frequency or less, and to obtain original waveform data for a low frequency range. . Then
This original waveform data is used as it is as the waveform data for the high-strike component, and the original waveform data is passed through a low-pass filter, so that the number of harmonics within a predetermined range is defined as the waveform data for the medium-strike component, and the number of harmonics is further limited. These are used as waveform data for a weak hit component. This operation is performed for both the left and right channels to create a total of six types of waveform data.

More specifically, the left channel tone generator 30 comprises a weak component tone signal generator 50, a middle component tone signal generator 51, a strong component tone signal generator 52, and an adder 53. I have. Envelope signals are separately supplied from the envelope generation unit 31 to the weak hit component tone signal generation unit 50, the middle hit component tone signal generation unit 51, and the high hit component tone signal generation unit 52. The envelope signal generated by the envelope generator 31 is transmitted to the CPU 10
It is created based on the envelope data included in the tone color data sent from. With this envelope signal, the amplitude of the waveform data read out by the weak beating component tone signal generator 50, the middle hit component tone signal generator 51, and the strong hit component tone signal generator 52 is adjusted. As a result, the mixing ratio of the weak-hit component tone signal, the middle-hit component tone signal, and the strong-hit component tone signal is adjusted.

The low-strike component tone signal generator 50 constitutes one oscillator, and when tone generation is instructed by sending timbre data from the CPU 10, a low-strike for the left channel of the waveform memory 40 is generated. The component waveform data is read out, multiplied by the envelope signal sent from the envelope generating section 31, and sent to the adder 53 as a weakly hit component tone signal. At this time, if the sounding instruction is related to a key belonging to the low range, the weak hit component waveform data stored for the left channel and the low range in the waveform memory 40 is read out, and the key belonging to the middle range is read. , The weak hit component waveform data stored for the left channel and for the middle tone range of the waveform memory 40 is read out,
If it is related to a key belonging to the treble range, the waveform memory 4
The weak-hit component waveform data stored for the high-frequency range is read regardless of the 0 channel. Note that the tone range to which the key belongs to is determined by the waveform address included in the timbre data. The same applies to the following.

The middle strike component tone signal generator 51 constitutes one oscillator. When tone generation is instructed by sending timbre data from the CPU 10, the middle strike for the left channel of the waveform memory 40 is performed. The component waveform data is read out, multiplied by the envelope signal sent from the envelope generating section 31, and sent to the adder 53 as a middle-hit component tone signal. At this time, if the sounding instruction is for a key belonging to the low range, the middle hit component waveform data stored for the left channel and for the low range in the waveform memory 40 is read out, and the key belonging to the middle range is read. , The middle hit component waveform data stored for the left channel and the middle tone range of the waveform memory 40 is read out,
If it is related to a key belonging to the treble range, the waveform memory 4
The medium-hit component waveform data stored for the high-frequency range is read regardless of the channel 0.

The bang component tone signal generation unit 52 constitutes one oscillator. When a tone is instructed by sending timbre data from the CPU 10, a bang component waveform for the left channel in the waveform memory 40 is generated. The data is read out, multiplied by the envelope signal sent from the envelope generating section 31, and sent to the adder 53 as a high-strength component tone signal. At this time, if the sounding instruction is related to a key belonging to the low range, the high-strength component waveform data stored for the left channel and for the low range in the waveform memory 40 is read out, and the key belonging to the middle range is read. If this is the case, the strong-hit component waveform data stored in the waveform memory 40 for the left channel and for the midrange is read out,
If it is related to a key belonging to the treble range, the waveform memory 4
The high-strength component waveform data stored for the high-frequency range is read regardless of the 0 channel.

The adder 53 is provided with a low-strength component tone signal and a middle-strength component tone signal transmitted from the low-strength component tone signal generator 50, the middle-strength component tone signal generator 51, and the high-strength component tone signal generator 52. And by adding the high-strength component tone signal. The signal added by the adder 53 is converted to a digital tone signal for the left channel by a D / D signal.
It is sent to the A converter 18.

More specifically, the right channel tone generator 32 comprises a weak component tone signal generator 60, a middle component tone signal generator 61, a strong component tone signal generator 62, and an adder 63. I have. Envelope signals are separately supplied from the envelope generation unit 33 to the low hit component tone signal generation unit 60, the middle hit component tone signal generation unit 61, and the high hit component tone signal generation unit 62. The envelope signal generated by the envelope generation unit 33 is
It is created based on the envelope data included in the tone color data sent from. With this envelope signal, the amplitude of the waveform data read out by the low-strength component tone signal generation unit 60, the middle-throw component tone signal generation unit 61, and the high-strength component tone signal generation unit 62 is adjusted. As a result, the mixing ratio of the weak-hit component tone signal, the middle-hit component tone signal, and the strong-hit component tone signal is adjusted.

The right-channel tone generator 32 includes a low-strength component tone signal generator 60, a middle-strength component tone signal generator 61, a hard-strike component tone signal generator 62, and an adder 63.
Are the same as those of the above-described left-channel tone generator 30, the soft-beat component tone signal generator 50, the middle-hit component tone signal generator 51, the hard-hit component tone signal generator 52, and the adder 53. Except that the operation is performed by reading out the waveform data from the waveform memory 40, these operations are the same, and a description thereof will be omitted. The signal output from the adder 63 of the right channel tone generator 32 is sent to the D / A converter 18 as a right channel digital tone signal.

The D / A converter 18 converts the digital tone signal for the left channel and the tone signal for the right channel output from the tone generator 17 into an analog tone signal. The output of the D / A converter 18 is supplied to a sound system 19.

The sound system 19 comprises an amplifier and a speaker or headphones. The sound system 19 amplifies the input analog musical tone signal at a predetermined amplification rate and sends out the amplified signal to a speaker or headphones.
It is well known that an analog musical tone signal as an electric signal is converted into an acoustic signal by a speaker or headphones and output.

Next, the operation of the electronic musical instrument in the above configuration will be described. FIG. 4 is a flowchart showing the operation of the electronic musical instrument, which is realized by the processing of the CPU 10. This flowchart is started when the power is turned on. That is, when the power is turned on, first, an initialization process is performed (step S10).

In this initialization process, the internal state of the CPU 10 is set to the initial state, and the registers, counters, flags, etc. defined in the RAM 12 are set to the initial state. Further, in this initialization process, by transmitting predetermined data to the tone generator 17, a process for preventing generation of unnecessary sound when the power is turned on is performed.

When the initialization process is completed, it is checked whether there is a panel event (step S11). In the process of determining the presence / absence of a panel event, first, the panel scan circuit 14 scans the operation panel 13 to acquire panel data indicating the setting state of each switch as a bit string corresponding to each switch. Next, the previously read panel data (already stored in the RAM 12) is compared with the currently read panel data,
Check whether a different bit exists. If there is a different bit, it recognizes that a panel event has occurred, and creates an event map in which the bit corresponding to the changed switch is set to ON. The presence or absence of a panel event is determined by referring to this event map.

When it is determined in step S11 that a panel event has occurred, a panel event process is performed (step S12). In this panel event processing,
Processing for a switch on the operation panel 13 that has changed,
For example, a tone change process corresponding to a tone select switch, a rhythm change process corresponding to a rhythm select switch, a volume change process corresponding to a volume control switch, or a process for giving a predetermined musical effect corresponding to a sound effect switch, and the like. Done. Note that the content of the processing corresponding to each switch is not directly related to the present invention, and thus the description is omitted.

On the other hand, if it is determined in step S11 that there is no panel event, the processing in step S12 is skipped. Next, it is checked whether a key event has occurred (step S13). The presence / absence of the key event is determined by examining a signal indicating the presence / absence of an event included in the event signal output from the touch detection circuit 16.

If it is determined that there is no key event, the process returns to step S11, and the same processing as described above is repeated. In the course of this repetitive execution,
If it is determined in step S13 that a key event has occurred, then it is checked whether the event is a key-on event (step S14). This is performed by checking a signal indicating the type of event included in the event signal output from the touch detection circuit 16.
At this time, the note number and touch data of the key at which the key event occurred are also fetched and stored in a predetermined area of the RAM 12.

When it is determined that the event is a key-on event, an assignment process is performed (step S).
15). This assignment processing is performed by C
This is a process realized by the PU 10. That is, CPU1
When a note number is sent from the touch detection circuit 16 and stored in the RAM 12, a sound of 0 is assigned to a different number of oscillators according to the range of the note number.

That is, when the note number belongs to the low tone range or the middle tone range, sound is assigned to a total of six oscillators, three for the left channel and three for the right channel. On the other hand, when the note number belongs to the high frequency range, sound is assigned to three oscillators shared by both the left and right channels. The process of assigning pronunciation to this oscillator is
This can be performed using various known assigners. The oscillator number of the assigned oscillator is stored in a predetermined area of the RAM, and is referred to at the time of sound generation processing.

Next, a tone generation process is performed (step S).
16). This means that the timbre data is transferred to the oscillator to which the tone is assigned in the assignment process (the oscillator number is stored in a predetermined area of the RAM 12),
This is a process for activating the oscillator to generate a digital tone signal.

That is, when three oscillators are assigned in the above-mentioned assignment process in order to generate a high frequency range, each of the waveforms for the high frequency range, the middle frequency range, and the low frequency range included in the common waveform data is used. In order to perform sound generation based on the data, predetermined tone color data is transferred to the three assigned oscillators. In addition, in the above assignment processing, when six oscillators are assigned to generate the middle or low range sound, the high frequency range, the middle frequency range, and the low frequency range for both the left and right channels included in the unique waveform data are included. In order to generate a sound based on each waveform data for the tone range, predetermined tone color data is transferred to three oscillators of each of the assigned left and right channels. At this time, as the envelope data included in each tone color data, one having a value (level) corresponding to the touch data is used.

Thus, when generating a musical tone in the high frequency range, a digital musical tone signal common to both the left and right channels is generated by the three oscillators, and when generating a musical tone in the middle frequency range or the low frequency range, the digital tone signal for the left channel is generated. Are generated by three oscillators, and the digital tone signal for the right channel is generated by the other three oscillators.
Then, as described above, the digital tone signal generated by the tone generator 17 is converted into an analog tone signal by the D / A converter 18 and sent to the sound system 19 to emit a predetermined tone. . Thereafter, the process returns to step S11, and the same processing as described above is repeated.

On the other hand, if it is determined in step S14 that the event is not a key-on event, it is recognized that the event is a key-off event, and a mute process is performed (step S1).
7). This silencing process is a process of adding a release envelope to a tone being sounded to stop sounding. This silencing process is not directly related to the present invention, and thus the details are omitted. Then, step S11
And the same processing as described above is repeated.

As described above, the above steps S11 to S17
When an event based on a panel operation or a keyboard operation occurs in the process of repeatedly executing, various functions of the electronic musical instrument are realized by performing processing corresponding to the event.

As described above, according to this embodiment, as shown in FIG. 3, for example, as shown in FIG. Waveform data (consisting of waveform data of a strong strike component, a middle strike component, and a weak strike component), and a unique signal used separately for the left channel and the right channel to generate a mid-range or low-range tone Waveform data (each constituted by waveform data of a strong hit component, a middle hit component, and a weak hit component) is stored. When a high-tone tone is designated by the keyboard 15, the common waveform data is read to generate a tone signal, and when a middle-tone or low-tone tone is designated, the unique waveform data is read to generate a tone signal. Is generated.

Therefore, it is necessary to prepare the waveform data of the middle or low frequency range in the waveform memory 40 separately for the left and right channels, but the waveform data of the high frequency range is commonly used for both the left and right channels. Since it is sufficient to prepare the types, it is possible to reduce the amount of the waveform data prepared in advance in the waveform memory 40, thereby saving the time for creating the waveform data and reducing the capacity of the waveform memory 40 for storing the waveform data. can do. This means that if the storage capacity is the same, the division number “N” of the range described in the section of the related art will be described.
And the number of divisions “M” or the like of the keying strength can be increased, and it is possible to perform fine-grained tone control.

In the above embodiment, when a high-tone musical tone is designated by the keyboard 15, sound is assigned to three (first number) oscillators, and a mid-range or low-tone musical tone is designated. 3 for left channel
And three for the right channel, a total of six (second number) oscillators are assigned to sound generation. The three oscillators for generating high-tone musical tones read out common waveform data from the waveform memory 40 and generate common musical tone signals for both the left and right channels. Therefore, the same tone signal is used as the tone signal for both the left and right channels. Each of the three oscillators for the left and right channels for generating a middle tone or low tone tone reads the unique waveform data from the waveform memory 40 and generates separate tone signals on the left channel or the right channel.

Therefore, in the present embodiment, three oscillators are assigned to generate high-tone musical tones, and the musical tone signals generated by these oscillators are used as musical tone signals for both the left and right channels. It is possible to prevent a useless oscillator that does not contribute to the sense of spread of sounds from being assigned to sound generation, and increase the number of polyphonics.

Here, assuming that the number of divisions of the range is "N = 3", the number of divisions of the keying strength is "M = 3", and the number of oscillators of the tone generator 17 is "P = 30", the tone signal generating apparatus of the present embodiment is used. (1), (2)
Let's apply the formula and compare. <Conventional Tone Signal Generating Device> Number of Waveform Data = 3 × 3 × 2 = 18 [Waveform Data] Polyphonic Number = 30 / (3 × 2) = 5 [Sound] <Tone Signal Generating Device of the Present Embodiment> Waveform Number of data = 2 × 3 × 2 + 1 × 3 × 1 = 15
[Waveform data] Polyphonic number (maximum) = 30 / (3 × 1) = 10
[Sound] Polyphonic number (minimum) = 30 / (3 × 2) = 5
[Sound] That is, the number of waveform data is 18 waveform data in the conventional tone signal generation device, but is 15 waveform data in the present embodiment, and can be reduced by 3 waveform data. The polyphonic number is conventionally five tones, but in the present embodiment is between five and ten tones (depending on the number of keys pressed in the high range), and can be increased by a maximum of five tones.

In the above embodiment, the keyboard 15
As shown in FIG. 2, the range of pitch names A0 to B2 is defined as a low range, the range of pitch names C3 to B5 is defined as a middle range, and the range of pitch names C6 to C8 is defined as a high range, and a waveform is defined for each range. Although the sound is prepared by preparing the data, the boundaries of the respective sound ranges are not limited to the above. An arbitrary position can be set as a boundary of each range as needed. Also, the number of divisions of the sound range is not limited to the three ranges of the low range, the middle range, and the high range, and can be divided into an arbitrary number, for example, two ranges, four ranges, or more. If the number of divisions of the sound range is increased and optimal waveform data is prepared for each sound range, there is an advantage that fine-grained tone control becomes possible.

Further, in the above-described embodiment, the three types of waveform data of the strong hit component, the middle hit component, and the weak hit component are provided for each tone range. However, the present invention is not limited to this. 1
The same operation and effect as those of the above-described embodiment can be obtained even with a configuration including two types of waveform components, two types of waveform components, or four or more types of waveform components.

In the above embodiment, the case where the tone signal is generated in stereo (two channels) has been described. However, the present invention can be similarly applied to the case where a tone is generated on three or more channels. In this case, the low frequency range waveform data for the number of channels, the mid frequency range waveform data and 1
What is necessary is just to store two treble-range waveform data in the waveform memory 40.

In the above embodiment, the waveform data for the high frequency range is shared by each channel. However, the waveform data of an arbitrary frequency range may be shared by each channel as needed. .

Further, in the above-described embodiment, the case where the tone signal is generated based on the data sent from the keyboard 15 has been described. However, data for instructing a tone sent from outside, for example, sent from a MIDI device. Coming M
It is also possible to generate a tone signal similar to the above by the note-on message of IDI or the note-on data sent from the sequencer.

Further, it goes without saying that the tone signal generating apparatus of the present invention can be variously modified in addition to the configuration described above.

[0072]

As described in detail above, according to the present invention,
It is possible to provide a musical tone signal generation device capable of reducing the number of waveform data to be prepared in advance and increasing the number of polyphonics by efficiently using a limited number of oscillators.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an electronic musical instrument to which a tone signal generating device of the present invention is applied.

FIG. 2 is a diagram for explaining a keyboard and its sound range division in an embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration of a waveform memory according to an embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a waveform memory in a conventional tone signal generation device.

[Explanation of symbols]

 Reference Signs List 10 CPU 11 ROM 12 RAM 13 Operation panel 14 Panel scan circuit 15 Keyboard 16 Touch detection circuit 17 Tone generator 18 D / A converter 19 Sound system 20 System bus 30 Left channel tone generator 31 Left channel envelope generator 32 Right Channel tone generator 33 Right channel envelope generator 40 Waveform memory 50, 60 Weak component tone signal generator 51, 61 Medium hit component tone signal generator 52, 62 Strong hit component tone signal generator 53, 53 Adder

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-19464 (JP, A) JP-B-4-13717 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) G10H 7/02 G10H 1/00

Claims (2)

(57) [Claims] (1) Left and right to generate a musical tone in a specific range
Storage means for storing common waveform data commonly used in the right channel, and unique waveform data uniquely used in the left and right channels to generate musical tones in a range other than the specific range. Sounding instructing means for instructing sounding; and when the sounding instructing means instructs sounding in the specific range, the common waveform data read out from the storage means is used.
Based generates a tone signal for the left and right channels, the case where range of sound other than the specific range is designated used uniquely in a left and right channel is read from the storage means
Left and right channels based on the unique waveform data used.
A tone signal generating means for generating a tone signal for a channel . (2) Left and right to generate a musical tone in a specific range
Storage means for storing common waveform data commonly used in the right channel, and unique waveform data uniquely used in the left and right channels to generate musical tones in a range other than the specific range. Sounding instructing means for instructing sounding; and a sounding instruction means for instructing sounding of the specific range, a first number of oscillators. Second more than the number of one
Allocating means for allocating sounds to the number of oscillators, respectively, and the first number of oscillators to which sounds are allocated by the allocating means comprises a common waveform read from the storage means.
Generating tone signals for the left and right channels based on the data , wherein the second number of oscillators are
The specifics used for the read left and right channels
For left and right channels respectively based on waveform data
A tone signal generating means for generating the tone signal of the above.