JP2940763B2 - Electronic musical instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical instrument, and more particularly, to an electronic musical instrument.
The present invention relates to an electronic musical instrument capable of simulating a resonance effect in a musical instrument using strings such as a piano.

[0002]

2. Description of the Related Art In a real piano, while a key (key) is pressed, a part called a damper for muting a string corresponding to the key is apart from the string. Therefore, when many keys are depressed, resonance occurs by a plurality of strings, and for example, a phenomenon of a resonance effect in which the frequency of a musical tone slightly changes occurs. However, a conventional electronic musical instrument such as an electronic piano does not have a configuration in which a tone signal to be emitted changes depending on the number of key-ons or the number of sounds.

[0003]

Therefore, the conventional electronic musical instrument as described above has a problem that the resonance effect cannot be simulated.

[0004] It is an object of the present invention to improve the above-mentioned problems of the prior art and to provide an electronic musical instrument capable of simulating a resonance effect.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided an electronic musical instrument capable of simultaneously generating a plurality of musical tones, detecting means for detecting the number of currently generated tones, and musical tones generated based on the detected number of tones. wherein the frequency of a amendments means for positive Fix.

[0006]

According to the present invention, by detecting the number of sounds that are sounding simultaneously by such means, and by correcting or correcting the frequency of the tone being generated in accordance with the number of sounds,
Simulation of the resonance effect can be performed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an electronic musical instrument to which the present invention is applied will be described below in detail. FIG. 1 is a block diagram showing the configuration of the electronic musical instrument. The CPU 1 controls the entire electronic musical instrument according to a program stored in the ROM 2. It also has a built-in timer interrupt circuit. In addition to the control program, the ROM 2 stores, for example, music data for demo music or various timbre data. The RAM 3 is used as a work area for the CPU 1 and stores various control data such as a key assignment table and a sound source control information table. The panel 4 has various switches such as a tone setting switch and a demo music performance switch, a volume for adjusting a tempo and a volume, or an LED or liquid crystal display device. , And a drive circuit for driving the display device.

The MIDI interface 5 is connected to an external MIDI
Connect to DI device. The keyboard 6 is composed of a plurality of keys (keys) each having a switch.
The switch of the key is scanned by the control of PU1. The tone generator circuit 8 can generate, for example, 16 channels of independent digital tone signals by time division multiplexing processing under the control of the CPU 1.

The waveform memory 9 is a memory for storing musical tone waveform information corresponding to various timbres. As a waveform of one timbre, for example, in the case of a piano, a key is strongly struck for each key group within a certain pitch range. Waveform information for a period from the attack portion of time to the decay and sustain portions is stored. Note that there is also a method of storing only a waveform for a half cycle or a quarter cycle and repeatedly reading the waveform. D / A converter 1
0 performs digital-to-analog conversion of the digital signal output from the tone generator 8. The amplifier 11 amplifies the analog musical tone signal and is output from the speaker 12. The bus 13 connects each circuit of the electronic musical instrument.

FIG. 2 is a functional block diagram showing the functions of a control section comprising a CPU, a ROM and a RAM and the tone generator circuit 8.
The read speed data table 20 converts a key-on key number, which is pitch information, into waveform read speed (read address interval) data. The read speed determining unit 21 corrects the read speed data based on the number of sounds generated by the sound counter 22 and outputs the corrected data to the waveform read circuit 23 of the tone generator 8. The waveform read circuit 23 accumulates the read speed (read address interval) data to generate a waveform memory read address, and according to the address information, generates the waveform memory read address.
A waveform signal of a desired pitch is read out from the.

The envelope data table outputs parameters such as an envelope speed and a target level for each period such as attack and decay based on timbre information and touch information, and the envelope generator 25 generates an envelope signal based on these parameters. I do. The multiplier 26 multiplies the waveform signal by an envelope signal and outputs a tone signal. With such a configuration, the frequency of the generated tone signal can be corrected according to the value of the tone generation counter.

Next, the processing of the CPU will be described in detail.
FIG. 3 is a flowchart showing the main processing of the CPU 1. When the power of the electronic musical instrument is turned on, in step S1, various hardware such as a CPU and a tone generator LSI,
Alternatively, data in the RAM is initialized. In step S2, it is checked whether or not a switch on the panel has changed. If a change has occurred, a process corresponding to the switch or the like that has changed is performed. In step S3, it is checked whether or not the state of the foot pedal has changed. If the state has changed, a corresponding process is performed. In step S4, it is checked whether or not the state of the key has changed, and if there has been a change, a corresponding process is performed. After step S4, the process returns to step S2, and the process is repeated.

FIG. 4 is a flowchart showing the pedal event process in step S3. In step S10, it is checked whether or not the damper pedal has changed to off.
If it has changed to off, the process proceeds to step S11, and in step S11, the damper pedal on flag is reset. In step S12, the assigned key is in the key-off state, but the envelope is attenuated at the release speed and the sound generation is stopped for the channel in which sound generation is continued because the damper pedal is on. In step S13, step S12
The sound generation counter is decremented by the number of channels whose sound generation has been stopped. This processing will be described later.

If there is no damper pedal off event in step S10, the process proceeds to step S14,
In step S14, it is checked whether or not the damper pedal has been turned on. If there is an ON event, the process proceeds to step S15, and a damper pedal ON flag is set. In step S14, there is no damper pedal on event, or after the processing in step S13 or S15, the process proceeds to step S16, where processing related to other pedals is performed.

FIG. 5 is a flowchart showing the key event processing in step S4 of FIG. In step S20, it is checked whether there is a key-on event (key-on change), and if so, the process proceeds to step S21. In step S21, a sounding counter is incremented. This will be described later. In step S22, a so-called key assignment process is performed, and the tone generation control parameters are set in the channel assigned to the tone generator circuit. In step S23, the tone generator circuit is activated, and sound generation is started.

If there is no key-on event in step S20, the process proceeds to step S24, and step S2
At 4, it is checked whether there is a key-off event. If there is a key-off event, step S2
The process goes to 5 to check whether the damper pedal is on or not by looking at the damper pedal on flag. If the damper pedal is on, the damper pedal is attenuated at the sustaining speed. When the damper is turned off, the process proceeds to step S26, in which the release speed is set to the envelope generator of the channel assigned to the key that has been turned off, and the tone is rapidly attenuated. In step S27, the sound generation counter is decremented.

FIG. 6 is a flow chart showing the increment and decrement processing of the tone generation counter. In step S30 of the increment processing, the sound generation counter is incremented. This processing corresponds to step S2 in FIG.
1, the value of the sounding counter is not changed if a newly keyed-on key is assigned to the currently sounding channel at the time of key assignment. In step S31 of the decrement processing, step S1
The sound generation counter is decremented by 2 or the number of sounds erased in step S26. Also, if the sound source channel is released from the assignment due to sufficient attenuation even while the damper is on, the sound generation counter is also decremented. In short, the value of the tone generation counter is controlled to be equal to the number of currently sounding channels.

In step S32, tuning data in which the frequency of the musical tone is corrected from the counter value is obtained. There are various methods for obtaining the correction rate. For example, a conversion table may be used, or the correction rate may be obtained by calculation from a counter value. FIG. 7 is an explanatory diagram showing an example of the contents of the conversion table between the counter value and the correction rate. In the figure, when the count value becomes 2 or more, the correction rate slightly increases from 1 according to the count value. The read speed determining unit 21 of FIG. 2 incorporates this conversion table, obtains a correction rate from the value of the sounding counter, and corrects the read speed data by multiplying the read speed data by the correction rate.

In step S33, the corrected tuning data is set in the waveform reading circuit of the tone generator circuit. The processing in steps S32 and S33 is performed for all currently sounding channels. With the above configuration and processing, the resonance effect can be simulated by correcting the frequency of the musical tone according to the number of sounds.

Next, a second embodiment will be described. In the resonance effect of the actual piano, the fundamental wave hardly changes, and only the frequency of the harmonic wave changes. Therefore, in order to more faithfully simulate the resonance effect, it is necessary to divide the bands and perform control for each band. The second embodiment is for more faithfully simulating the resonance effect. The band is divided into three, and the frequencies of the signals in the two bands of the harmonic part are corrected by the sound count value. Things.

FIG. 8 is a functional block diagram showing functions of the control unit and the tone generator circuit in the second embodiment. The read speed data table 30 converts a key number into waveform read address interval data. This data is supplied to the first waveform readout circuit 37 as it is, and the circuit reads out low-frequency waveform data mainly corresponding to the fundamental wave from the waveform memory L34 and outputs it to the multiplier 40. Therefore, the frequency of the fundamental wave is not modified by the sounding counter.

The read speed determining section A31 corrects the waveform read address interval data output from the read speed data table 30 in the same manner as in the first embodiment, and supplies the corrected data to the second waveform read circuit 38. This circuit mainly reads the middle-range waveform data corresponding to the lower-order harmonics from the waveform memory M35, and outputs the data to the multiplier 41.
Therefore, the frequency of the harmonic in this band is corrected by the sounding counter. The read speed determining unit B32 also corrects the waveform read address interval data and supplies the corrected data to the third waveform read circuit 39. The circuit mainly reads out high-frequency waveform data corresponding to higher-order harmonics from the waveform memory H36, and outputs it to the multiplier. Therefore, the frequency of the harmonic in this band is also corrected by the sounding counter. Each waveform data is multiplied by a different envelope by each of the multipliers 40, 41, and 42.
Are added and synthesized.

Here, if the correction rate stored in the conversion table used by the reading speed determination units A and B is set to a larger value in the table corresponding to B, for example, the correction rate is changed depending on the band. It is possible to more faithfully simulate the resonance effect. In the second embodiment, an example in which the band is divided into three is shown. However, if the band is divided into two or more arbitrary numbers, the effect of the present invention can be obtained. Although the example in which the band of the fundamental wave is not modified has been described, the band of the fundamental wave may be modified at a modification rate different from that of the other bands.

Although the embodiment has been described above, the following modifications are also conceivable. Although the example of correcting the correction rate in the direction in which the frequency increases as the count value increases has been described, the correction may be performed so that the frequency decreases with the count value. FIG. 7 shows an example in which the correction rate gradually increases with an increase in the count value and saturates at a certain value. However, the correction rate increases linearly, or a fixed value is set for each range of the count value. It may be a function that increases likewise.

In this embodiment, an example is shown in which the correction rate is multiplied. However, the correction can be made by adding a correction value. Also, it can be controlled by the same mechanism in accordance with the effect of vibrato or the like. Further, the envelope may be controlled simultaneously with the frequency. Since the resonance effect is different between the case where the damper is on and the case where it is off, a conversion table having a different correction rate may be used depending on whether the damper is on or off.

In the case where the count value changes, the frequency of all musical tones being generated is corrected again. However, only a part of the frequency, for example, a high-level one or a newly-generated one is changed. The frequency may be corrected, and the frequency may be gradually shifted instead of changing the frequency at once.

[0027]

As described above, according to the present invention, the following effects can be obtained. 1. By modifying the frequency of the generated musical tone according to the number of sounds, it is possible to simulate the resonance effect of an actual piano. 2. By dividing the band of the generated musical tone and making different corrections, a more faithful simulation can be performed. 3. Using the hardware of conventional electronic musical instruments as it is,
It can be easily realized simply by adding a control function.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an electronic musical instrument.

FIG. 2 is a functional block diagram illustrating functions of a control unit and a tone generator circuit.

FIG. 3 is a flowchart illustrating main processing of a CPU.

FIG. 4 is a flowchart showing a pedal event process.

FIG. 5 is a flowchart showing key event processing.

FIG. 6 is a flowchart showing a sounding counter update process.

FIG. 7 is an explanatory diagram showing an example of the contents of a correction value table.

FIG. 8 is a functional block diagram illustrating functions of another embodiment.

[Explanation of symbols]

1 CPU, 2 ROM, 3 RAM, 4 panel, 5
... MIDI interface, 6 ... Keyboard, 7 ... Scan circuit, 8 ... Sound generator circuit, 9 ... Waveform memory, 10 ... D
/ A converter, 11 amplifier, 12 speaker, 13 bus

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G10H 7/02 G10H 7/00

Claims (5)

(57) [Claims] 1. A plurality of generating an electronic musical instrument tone simultaneously, and detecting means for detecting a number of sound currently sound, based on the number of detected sound, the frequency of the generated musical tone high
An electronic musical instrument, comprising: a correction means for correcting the number of pronunciations , wherein the correction rate increases as the number of pronunciations increases . 2. When the number of sounds exceeds a predetermined number, the correction is performed.
2. The method according to claim 1, wherein the rate of increase of the rate is reduced.
Electronic musical instrument as described. Wherein the correction means, according to the number of sound, the electronic musical instrument according to claim 1 or 2, characterized in that to correct the waveform reading interval from the waveform memory. 4. An electronic musical instrument for synthesizing a plurality of waveform signals in order to generate one musical tone, wherein said correcting means corrects the frequency of at least one of said waveform signals. The electronic musical instrument according to any one of claims 1 to 3, wherein: 5. The method according to claim 1, wherein the plurality of waveform signals are in a plurality of frequency bands.
Correction of the frequency of a waveform signal that is classified and belongs to one band
Rate is different from the correction rate of the frequency of the waveform signal belonging to the other band.
The electronic musical instrument according to claim 4, wherein: