JP3662112B2 - Electronic musical instruments - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic musical instrument, and more particularly to an electronic musical instrument having a localization correction unit suitable for improving the separation of each sound when a plurality of sounds are simultaneously generated.
[0002]
[Prior art]
In general, in a keyboard musical instrument such as a piano, when a plurality of sounds are simultaneously generated in a chord performance or the like, each sound is generated from different positions and mixed (mixed) in a space and enters a human ear. On the other hand, in an electronic musical instrument, chord performance information input at the same time is mixed into one musical tone signal as a digital or analog signal, and then is emitted from a speaker and enters a human ear.
[0003]
Therefore, in a keyboard instrument such as a piano, each sound is clear and the chords are well separated, so that each sound can be distinguished and has a spatial spread. On the other hand, in an electronic musical instrument, each sound becomes muddy due to phase interference, cross modulation distortion, etc. when mixing musical sound signals, and since the separation of chords is poor, each sound is difficult to distinguish and does not have a spatial spread.
[0004]
In general, panning, stereo sampling, or the like is used to provide a spatial expansion of sound. In panning, the sound from a single sound source is separated into two left and right channels, and the sound image is distributed to the left and right by changing the output ratio between the left and right. In addition, it is possible to prevent the high and low sounds from overlapping each other by assigning the two channels to the low sound range and the high sound range, for example, by assigning the low sound to the left channel and the high sound to the right channel.
[0005]
On the other hand, in the stereo sampling method, when recording the sound of a musical instrument, the left and right channels are used to record the sound including the spatial expansion of the sound, and this is reproduced on each of the two channels. That is, since a sound source is provided for each of the left and right channels from the beginning, a plurality of sounds do not overlap with one output.
[0006]
[Problems to be solved by the invention]
The above-described method for providing spatial expansion of the sound is effective when a plurality of sound ranges that are simultaneously generated are separated from each other. However, when a plurality of sounds that are simultaneously generated are in a sound range close to each other, there is no effect because the sound concentrates on one channel. For example, when the output ratio is changed by panning to give a spatial spread, if the sound to be generated is a medium sound, it is the same as monaural.
[0007]
Therefore, when multiple sounds of close scales such as chords are generated simultaneously, it is difficult to make each chord sound easy to hear by the conventional method, and it is not possible to have a spatial spread of sound. There was a problem.
[0008]
It is an object of the present invention to provide an electronic musical instrument that can solve the above-described problems and can have a spatial sound spread by a plurality of sound systems when a sound generation instruction is given at the same time.
[0009]
[Means for Solving the Problems]
In order to solve the above problems and achieve the object, the present invention has a plurality of sound systems respectively arranged at different positions, and responds to one sounding instruction from the sound source device through the plurality of channels. In an electronic musical instrument configured to supply a musical sound signal to the sound system corresponding to each of the sound systems, the pitch between the sound that is instructed to be sounded and the sound that is instructed to be sounded before the scheduled time elapses from Pitch calculating means for calculating, and means for changing the localization of sound generated by a sound system corresponding to two preset channels of the plurality of channels according to the pitch calculated by the pitch calculating means. There is a feature in the point.
[0010]
According to this feature, when a plurality of pronunciations are performed within the scheduled time, particularly when the pitch, that is, the pitch difference is large, the output of the musical sound signal output to each channel is corrected and the localization is changed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 2 is a block diagram showing a configuration of an electronic musical instrument including a performance effect applying apparatus according to an embodiment of the present invention. In the figure, the CPU 1 inputs tone color information inputted from the control panel 2, pitch information (key number) corresponding to key depression of the keyboard 3, and touch (key depression strength) information to the sound source device 4. The control panel 2 is also provided with a power on / off switch, a localization correction mode selection switch, which will be described later, and the like (both not shown). The sound source device 4 has a function of synthesizing a musical tone by, for example, a sine wave addition method, and outputs a musical tone signal based on the timbre information, pitch information, touch information, and the like.
[0012]
The sound source device 4 outputs two musical sound signals respectively supplied to the sound systems 5 and 6. The sound systems 5 and 6 each include a left speaker and a right speaker. The two outputs are musical sounds for left and right channels (hereinafter referred to as “L channel” and “R channel”, respectively) after panning is applied when the sound source device 4 is a monaural sound source. In the case of a stereo sound source, it is a tone signal for the L channel and R channel generated by each sound source. Since the tone signal output from the tone generator 4 is a digital signal suitable for computer processing, D / A converters 7 and 8 are provided to convert the tone signal into an analog signal suitable for the sound systems 5 and 6. ing.
[0013]
The CPU 1 has a localization correction calculation unit 9 for changing the localization of the output of the sound source device 4 as its function. Based on the key depression information supplied from the keyboard 3, the localization correction calculation unit 9 corrects the output of the musical sound signals output to the L channel and the R channel to change the localization. Specifically, the localization correction calculation unit 9 calculates the L channel multiplication coefficient MultL and the R channel multiplication coefficient MultR based on the key depression information, and supplies them to the multipliers 10 and 11.
[0014]
FIG. 1 is a block diagram showing main functions of the localization correction calculation unit 9. In the figure, a key-on switch 30 is provided corresponding to each key of the keyboard 3, and outputs a key number and touch information when a key is pressed. The key-on detector 90 detects the occurrence of key-on and the key-on number based on the output of the key-on switch 30. The key number KeyNum detected by the key-on detection unit 90 is stored in the key number storage unit 91. The key number storage unit 91 has an area for storing one key number, and is configured so that when one data is input, the previously stored data is output. The initial data in the key number storage unit 91 may be an arbitrary key number.
[0015]
The key number KeyNum detected by the key-on detection unit 90 is also input to the pitch calculation unit 92. When the key number KeyNum is newly input, the key number storage unit 91 sends the previously stored key number KeyBuf to the pitch calculation unit 92. That is, the pitch calculation unit 92 calculates the difference between the key number at the previous key-on and the key number at the current key-on, that is, the pitch.
[0016]
The timer 93 starts counting time (t) by the signal s1 output at the same time as the pitch is output from the pitch calculation unit 92. When the counting is started, the output of the timer 93 changes to “1”, and the output changes to “0” when the time is up.
[0017]
The pitch calculation unit 92 calculates a pitch only when key-on is detected when the output of the timer 93 is “1”, and when key-on is detected when the output of the timer 93 is “0”, Outputs a fixed fixed pitch. The fixed pitch is set such that the multiplication coefficient calculation unit 96 calculates the value “1” as the multiplication coefficients MultL and MultR. That is, if the time from the previous key-on to the current key-on is equal to or longer than time (t), the output of the sound source device 4 is not changed and the localization is not changed.
[0018]
The signal s 1 is input to the timer 93 through the AND gate 94. The AND gate 94 uses the output of the timer 93 inverted by the inverter 95 as the other input. Therefore, the AND gate 94 is not opened during the operation of the timer 93, and the signal s1 is not input to the timer 93. That is, even if the key-on is detected and the pitch is calculated by the pitch calculation unit 92 during the operation of the timer 93, the timer 93 does not newly start counting time (t), and the output of the timer 93 is “1”. Is maintained.
[0019]
The output of the pitch calculation unit 92 is input to a multiplication coefficient calculation unit 96, which uses a predetermined calculation formula (described later) according to the input pitch to the multipliers 10 and 11. The supplied multiplication coefficient MultL and multiplication coefficient MultR are calculated.
[0020]
FIG. 1 shows an example of the function of the localization correction calculation unit 9, and modifications are possible. For example, the key number storage unit 91 is configured to immediately input the key-on number detected by the key-on detection unit 90 and to output the previously stored key number to the pitch calculation unit 92. However, this is because the key number detected when key-on is detected is stored in another buffer, the multiplication coefficient is output to the multipliers 10 and 11, and then the key number is transferred from the buffer to the key number storage unit 91. It can be modified to update the stored contents.
[0021]
The processing of the localization correction calculation unit 9 will be described with reference to the flowchart of FIG. The processing of FIG. 3, that is, the processing of the localization correction mode, starts when at least one preset operation is performed among power-on, localization correction mode selection switch on the control panel 2 and depression of the damper pedal, etc. Is done. In step S1, a time (t) for determining whether or not to correct the output signal of the sound source device 4 is set. This is performed by reading preset time data from the RAM in the CPU 1. As the time (t) for determining whether or not a plurality of keys have been pressed almost simultaneously in the RAM, for example, 0. 5 seconds is set.
[0022]
In step S2, it is determined whether or not the keyboard 3 is pressed (key-on) depending on whether or not the key-on switch 30 has been turned on. If step S2 is positive, the process proceeds to step S3, and it is determined whether or not the key-on is the first key-on. If it is the first key-on, the process proceeds to step S4 and timer processing is started to measure time (t). This timer process is performed so that the timer 93 is monitored by a timer routine (not shown) and a flag indicating the time up is set when the time (t) has elapsed.
[0023]
If it is not the first key-on, the process proceeds to step S5, and it is determined whether or not the time (t) has elapsed since the previous key-on, that is, whether or not the flag indicating that the timer 93 has timed up is set. If step S5 is positive, that is, if time (t) has elapsed, the process proceeds to step S4.
[0024]
If it is the first key-on, and if the time (t) has elapsed since the previous key-on, there is no need to change the localization and improve the separation of the sound from the previous pronunciation, so proceed to step S6. Multiplication coefficients MultL and MultR to be given to the multipliers 10 and 11 are set to “1”, respectively. In step S7, the multiplication coefficient MultL and the multiplication coefficient MultR are transmitted to the multipliers 10 and 11. In step S8, the key number KeyBuf is updated with the key number KeyNum corresponding to the current key-on.
[0025]
After step S8, the process proceeds to step S12, where it is determined whether or not to end the localization correction mode. This determination is affirmative when at least one preset operation, such as turning off the power, turning off the correction mode selection switch on the control panel 2, and releasing the depression of the damper pedal, is performed. If step S12 is negative, the process proceeds to step S2. If step S2 is negative, that is, no key-on is detected, the process immediately proceeds to step S12.
[0026]
If step S5 is negative, that is, if the time (t) has not elapsed since the previous key-on, the process proceeds to step S9. In step S9, the difference between the key number KeyBuf at the previous key-on and the key number KeyNum at the current key-on, that is, the pitch KeyDif (= KeyNum-KeyBuf) of two consecutive sounds within the scheduled time (t) is calculated.
[0027]
In step S10, it is determined whether the pitch KeyDif is "0" or "12", that is, whether the previous key-on and the current key-on have the same pitch or a difference of one or more octaves. In step S9, the pitch KeyDif is determined by an absolute value that is not positive or negative.
[0028]
If step S10 is positive, the process proceeds to step S6. In step S6, since the multiplication coefficients MultL and MultR are set to “1”, the tone signal output to the left and right speakers, that is, the sound systems 5 and 6 is maintained in the state generated by the sound source device 4. If the pitch of multiple music signals (here, two) is “0”, there is no need to change the panning. If the pitch is more than one octave, it can be heard by the human ear without changing the panning. It is easy. When the multiplication coefficients MultL and MultR are set to “1”, the output of the sound source device 4 does not change. Therefore, when the sound source is monaural and panning is applied, the output ratio of the panning is maintained. When the sound source is stereo, the left and right channel outputs are maintained.
[0029]
If step S10 is negative, that is, if the previous key-on and the current key-on are not the same pitch but are within one octave, the process proceeds to step S11, and the multiplication coefficients MultL and MultR are represented by the equations shown in the figure. Calculate according to (1) and (2). When the pitch KeyDif is “positive”, that is, when the current key-on is higher than the previous key-on, the multiplication coefficients MultL and MultR are calculated using the equation (1), and the pitch KeyDif is “negative”. In this case, that is, when the key-on of this time is lower than the previous key-on, the multiplication coefficients MultL and MultR are calculated using Equation (2). If the multiplication coefficients MultL and MultR are calculated, the process proceeds to step S7, and the calculated multiplication coefficient MultL and the multiplication coefficient MultR are transmitted to the multipliers 10 and 11.
[0030]
Expressions (1) and (2) are set such that the difference between the multiplication coefficient MultL and the multiplication coefficient MultR becomes larger as the pitch KeyDif is smaller (however, “0” or more). Therefore, if the pitch of the musical sound that is pronounced almost simultaneously is small within the time (t), the localization will be greatly changed, and it will be easy to distinguish both sounds.
[0031]
In the above embodiment, the multiplication coefficient is calculated based on the time difference from the immediately preceding pronunciation instruction and the pitch. However, the above-described embodiment can be modified so that the multiplication coefficient is calculated based on the time difference from the two or more previous sound generation instructions and the pitch.
[0032]
For example, in step S5, it is determined whether or not the scheduled time (t) has elapsed since the previous key-on. This is the first key-on, that is, the key-on that triggered the time (t) to be counted by the timer 93. It can be modified to determine whether or not the time (t) has elapsed since At the same time, step S9 is modified to calculate the pitch with the key-on number at the first key-on instead of calculating the pitch with the key-number at the previous key-on. In addition, the key number storage unit 91 needs to be modified so as to be able to store a key number for each key-on from a plurality of previous times.
[0033]
In short, it may be configured such that when two or more pronunciations having a small pitch occur within a preset time (t) for determining that the keys are turned on almost simultaneously, the localization can be changed for the subsequent pronunciations. If this viewpoint is maintained, the localization correction range is not limited to the above-mentioned one octave, and may be further enlarged or reduced. Furthermore, the calculation formulas (1) and (2) for the multiplication coefficients MultL and MultR can be modified to other formulas if the viewpoint that the localization is changed greatly as the pitch is small is maintained.
[0034]
In addition, the present invention is not limited to an electronic musical instrument having only two sound systems on the left and right, and also in a sound system having a central speaker, the present invention can be used when changing the localization by changing the outputs of the two left and right sound systems. Can be applied.
[0035]
In the present embodiment, an example in which a sounding instruction is detected in response to a key-on generated by an actual key depression by the keyboard 3 and the localization is changed is shown. However, for example, the present invention can also be applied to the case where the pitch of two consecutive sounds is detected based on the musical sound information stored in the ROM or the musical sound information input as MIDI data and the localization is changed.
[0036]
【The invention's effect】
As is clear from the above description, according to the present invention, it is possible to change the localization of a plurality of musical sounds produced within a scheduled time. Therefore, for example, if a very short time is set as the scheduled time, the localization of each of a plurality of sounds that are pronounced almost simultaneously such as chords is made different from each other, thereby improving the sense of separation of each sound, The feeling of spread can be increased.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating main functions of an electronic musical instrument according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a hardware configuration of an electronic musical instrument according to an embodiment of the present invention.
FIG. 3 is a flowchart of localization correction control according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... CPU, 2 ... Control panel, 3 ... Keyboard, 4 ... Sound source device, 5, 6 ... Sound system, 7, 8 ... D / A converter, 9 ... Localization correction | amendment calculating part, 10, 11 ... Multiplier, 30 ... Key-on switch, 90 ... Key-on detection unit, 91 ... Key number storage unit, 92 ... Pitch calculation unit, 93 ... Timer, 96 ... Multiplication coefficient calculation unit

Claims (3)

Each has a plurality of sound systems arranged at different positions, and is configured to supply a musical sound signal to the sound system corresponding to each of the channels from the sound source device through the plurality of channels in response to one sounding instruction. Electronic musical instruments
A pitch calculation means for calculating a pitch between a sound instructed to be sounded and a sound instructed to sound until a predetermined time elapses from the sounding instruction ;
Means for changing the localization of a sound generated by a sound system corresponding to two preset channels of the plurality of channels according to the pitch calculated by the pitch calculating means. Musical instrument. In order to change the localization, a multiplication means for multiplying the output of the two channels by a coefficient corresponding to the calculated pitch,
It said coefficients are, the more pitch the calculated small (where pitch> 0), according to claim 1, wherein it is set such that the output difference of the tone signal between the two channels is larger Electronic musical instrument. 3. The electronic musical instrument according to claim 1, wherein the coefficient is set so that the localization is not changed when the calculated pitch is equal to or more than a predetermined value.

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