JPH10326095A - Parameter setting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set parameters for obtaining desired musical sound characteristics through easy operation by generating the parameters according to inputted information and setting the generated parameters in a sound source. SOLUTION: A user operates a dial 156 to input a desired frequency value and a gain value. In this state, filter characteristic curve displayed on a display device 166 is referred to and when it is a desired filter characteristic curve, a determination switch 152 is pressed finally. Consequently, parameters corresponding to the filter characteristic curve are generated and sent to a digital filter built in the sound source. Then a filter characteristic setting switch 150 is pressed. Consequently, a filter characteristic setting flag is cleared and the electronic musical instrument enters it normal mode. In this state, when note information is inputted from a note event interface circuit, a sound based upon the note information is generated with a timbre conforming to the changed filter characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parameter setting device for setting a parameter for determining a tone characteristic to, for example, a sound source, and more particularly to a parameter setting device for inputting information for designating a tone characteristic curve. The present invention relates to a technique for setting parameters in a sound source.

[0002]

2. Description of the Related Art Generally, electronic keyboards, electronic pianos,
The timbre, volume, effects, and the like of musical tones generated by an electronic musical instrument such as an electronic organ and a synthesizer are determined by setting parameters for a sound source built in the electronic musical instrument. Then, a parameter setting device is used to set these parameters in the sound source. This parameter setting device is usually configured integrally with the electronic musical instrument.

A conventional parameter setting device generally has a preset memory. In this preset memory, a plurality of parameter sets are stored as preset data. Each parameter set includes a plurality of parameters for controlling a tone. Then, when one parameter set in the preset memory is selected by the user, the parameter set is loaded from the preset memory to the work memory. Next, the parameter set loaded in the work memory is supplied to the sound source. The sound source generates a tone signal based on various parameters included in this parameter set,
Send to headphones.

Incidentally, this kind of parameter setting apparatus generally has a data editing function for editing, for example, adding, deleting, and changing preset data loaded in a work memory. The user can obtain a tone having desired characteristics by editing the contents of the work memory using the data editing function.

[0005]

However, when a musical tone having desired characteristics is to be obtained by the above-mentioned editing, the editing operation may be very difficult depending on the type of the parameter to be edited. As an example, consider a case in which a tone having desired characteristics is obtained by editing the parameters of a filter. In this case, the user changes the parameters of the filter, such as the cutoff frequency and the resonance, and
After that, the musical tone is filtered by the filter characteristic based on the changed parameter to actually generate the sound and then listen to it. Then, if a musical tone having the desired characteristics cannot be obtained, the parameter change and the trial listening are performed again. Hereinafter, the user performs a task of gradually approaching a musical tone having a desired characteristic while repeatedly changing the parameter and listening to the sample.

This method is effective when the types of parameters to be edited are small. That is, if the types of parameters to be edited are, for example, about two types, the user can grasp the relationship between the changed parameters and the musical tone characteristics (for example, tone colors). However, if the number of edited parameters is, for example, three or more, the number of combinations increases, making it difficult to grasp the relationship between the changed parameters and the tone characteristics. Therefore, it is necessary for the user to repeatedly change the values of a large number of parameters and listen to the trial, and set the parameters so that the desired musical tone characteristics can be obtained through trial and error. There is a problem that such a parameter setting operation is very troublesome and requires a lot of time.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a parameter setting device capable of setting parameters for obtaining desired tone characteristics with a simple operation.

[0008]

According to the present invention, when a user sets a parameter for obtaining a desired tone characteristic, the type and value of the parameter are determined while imagining the tone characteristic curve. It was made based on the facts. For example, when a user obtains a musical tone having a desired filter characteristic, the user sets parameters while imagining a frequency characteristic curve of the filter.

In order to achieve the above object, a parameter setting device according to the present invention is a parameter setting device for setting a parameter for determining a tone characteristic in a sound source, and includes information for designating a tone characteristic curve. Input means for inputting, parameter generating means for generating parameters based on the information input by the input means, and setting means for setting the parameters generated by the parameter generating means to the sound source.

The tone characteristics may be frequency characteristics of a filter included in the sound source (hereinafter, may be simply referred to as “filter characteristics”). In the following,
In order to facilitate understanding of the present invention, a case where a filter characteristic is adopted as a tone characteristic will be described as an example.

The input means may be configured to input, for example, a frequency value and a gain value for designating a filter characteristic curve as information for designating a tone characteristic curve. In this case, a device capable of inputting numerical values, such as an up-down switch, a numeric keypad, or a dial, can be used as the input means.

The parameter generating means includes a parameter for realizing a tone characteristic curve based on the information input by the input means, for example, a cutoff frequency for realizing a filter characteristic curve based on the information input by the input means. , Resonance, etc. are generated. In other words, when the user inputs a tone characteristic curve with the input unit, the parameter generating unit generates a parameter corresponding to the tone characteristic curve, and the parameter is set as a sound source by the setting unit. Therefore, the user can easily and easily set a parameter for obtaining a tone characteristic as imaged, for example, a filter characteristic.

[0013] The parameter setting device of the present invention can further comprise display means for displaying a tone characteristic curve based on the information input by the input means. This display means can be constituted by a device capable of displaying, for example, a filter characteristic curve as a tone characteristic curve in a graphic form, for example, an LCD, a CRT or the like. According to this configuration, while watching the tone characteristic curve displayed on the display means, for example, the filter characteristic curve,
Since necessary information can be input, the parameter setting operation is simplified.

In the parameter setting device provided with this display means, for example, a mouse,
A pointing device such as a touch panel and a pen input device can be used. In this case, there is an advantage that necessary information can be input while visually grasping the tone characteristic curve, and the tone characteristic curve can be input quickly with high accuracy.

The parameter generating means of the parameter setting device according to the present invention includes a storage means for storing a plurality of parameter sets, and a plurality of parameter sets each representing a tone characteristic curve corresponding to each of the plurality of parameter sets stored in the storage means. First data generating means for generating first curve data;
Second data generating means for generating second curve data representing a tone characteristic curve corresponding to the information input by the input means; and a plurality of first curve data generated by the first data generating means. And detection means for detecting a curve closest to the second curve data generated by the second data generation means, and outputting a parameter set corresponding to the curve data detected by the detection means. Can be configured.

The storage means can be constituted by, for example, a read only memory (hereinafter, referred to as "ROM") or a random access memory (hereinafter, referred to as "RAM"). When this storage means is constituted by a RAM, a plurality of parameters may be loaded into the RAM when, for example, the power is turned on or a reset operation is performed. In addition, as storage means,
Other than these, for example, a floppy disk, a hard disk, a CD-ROM, and various other storage media can be used.

The first and second curve data generated by the first and second data generating means respectively include: when the tone characteristic curve is a filter characteristic curve, for example,
It can be represented by a set of coordinate values in two-dimensional coordinates with the X axis as the frequency and the Y axis as the gain. The first data generation means generates a plurality of first curve data corresponding to each of the plurality of parameter sets stored in the storage means. The second data generating means generates one second curve data corresponding to the information input by the input means. These first and second data generating means can be constituted by, for example, a central processing unit (hereinafter, referred to as “CPU”).

The detection means can be constituted by, for example, a CPU. This detecting means detects the one closest to the second curve data from the plurality of first curve data. This detection can be performed in various ways. For example, the detection by the detection unit may be performed by dividing the size of the first curve data and the size of the second curve data at all division points when the frequency band defined by the lowest frequency and the highest frequency is divided into a plurality of equal parts. The sum of the differences can be calculated for all the first curve data, and the smallest sum can be selected from the plurality of sums.

In other words, in the detecting means, the first curve data closest to the second curve data calculates the sum S by the following equation (1) for all the first curve data. It can be configured to detect by selecting the smallest one from the sum S.

[0020]

(Equation 1) However, when the tone characteristic is a filter characteristic, n is the frequency (X-axis value), _An is the gain of the second curve data at the frequency n (Y-axis value), and B _n is the first at the frequency n.
The gain of the curve data (Y-axis value), a is the lowest frequency,
b is the highest frequency.

In the detecting means, the size of the first curve data at all division points when the frequency band defined by the lowest frequency and the highest frequency is equally divided into a plurality of parts on a logarithmic axis is determined. The sum of the difference from the size of the two curve data is obtained for all the first curve data, and the smallest one of the plurality of sums is selected, so that the first curve data closest to the second curve data is obtained. Can be configured to detect.

Here, "equally dividing a frequency band into a plurality of parts on a logarithmic axis" means equally dividing a frequency axis (X-axis) represented by a logarithmic scale. According to this configuration, the bass range contributes more to the above-described detection than the treble range. Therefore, the first curve data that is most similar to the second curve data is scaled by a scale suitable for human hearing. Can be detected.

Generally, a human audible band is 20 Hz to 20 k.
It is said to be about Hz. Therefore, the lowest frequency that defines the frequency band is around 20 Hz, and the highest frequency is 20 k
It can be fixedly set to around Hz. In addition, the values of the lowest frequency and the highest frequency are not limited to the above, and can be arbitrarily determined.

Further, the parameter setting device of the present invention can further comprise frequency input means for inputting the lowest frequency and the highest frequency. The frequency input means can be constituted by a device capable of inputting numerical values, such as an up / down switch, a numeric keypad, and a dial. According to this configuration,
Since only an arbitrary part of the tone characteristic curve can be changed, it is possible to set parameters for realizing the tone characteristic curve having a characteristic only in a predetermined band.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. Although the parameter setting device can be configured as an independent device, a case where the parameter setting device is incorporated in an electronic musical instrument will be described below. Further, in this parameter setting device, it is assumed that parameters defining filter characteristics are set in a digital filter incorporated in the sound source 18 described later.

It is assumed that the digital filter is configured by serially connecting two-stage low-pass filters in two stages. Frequency characteristic g of this digital filter
(X) is represented by the following equation (2).

(Equation 2) However, the variable x is the frequency, f _c1 is the cutoff frequency of the first-stage digital filter, Q ₁ is the first stage of the digital filter resonance, f _c2 is the second stage of the digital filter of cut-off frequency, Q ₂ is the second stage This is the resonance of the digital filter. Accordingly, the parameters in the digital filter is a four f _c1, f _c2, Q ₁ and Q _2.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of an electronic musical instrument to which a parameter setting device according to an embodiment of the present invention is applied. In FIG. 1, a CPU 1
0, the program memory 11, the work memory 12, the panel scan circuit 13, the display device 16 included in the operation panel 14, the note event interface circuit 17, and the sound source 18 are mutually connected via a bus 20.

The panel scanning circuit 13 is connected to an operation element 15 included in an operation panel 14. The sound source 18 includes a D / A converter 180 and an amplifier 181.
And speakers are sequentially connected. As described above, the operation panel 15 includes the operation device 15 and the display device 16. The bus 20 is used for mutually transmitting and receiving the address signal, the data signal, and the control signal between the above elements.

The CPU 10 operates in accordance with the processing program stored in the program memory 11, thereby
The entire electronic musical instrument is controlled. The processing performed by the CPU 10 will be described later in detail with reference to a flowchart.

The program memory 11 is constituted by, for example, a ROM. The program memory 11 stores tables, timbre parameters,
In addition, various fixed data and the like are stored. The table includes a parameter table (see FIG. 3) for storing parameters of the digital filter. The timbre parameter is used to generate a predetermined timbre (instrument sound). A plurality of tone color parameters are provided, for example, for each tone color and tone range, and each tone color parameter is composed of, for example, a waveform address, frequency data, envelope data, and the like.

Here, the parameter table will be described with reference to FIG. The parameter table contains four types of parameters f used in the above equation (2).
_c1, the value of f _c2, Q ₁ and Q _2, for each parameter n
+1 are stored at a time. The value of each parameter is
f _1i , q _1i , f _2i and q _2i (i = 0, 1, 2,...)
n). These four types of filter characteristics
All combinations of each value of the kind parameter, ie n
There are only ^four types.

The work memory 12 is composed of, for example, a RAM. The work memory 12 defines a work area for temporarily storing various data processed by the CPU 10, a display data area for storing data to be displayed on the display device 16, and the like. In the work area,
For example, a table, a register, a counter, a flag, and the like are provided.

In this embodiment, a frequency characteristic input table as shown in FIG. 4 is used as the table. The frequency characteristic input table stores information for creating a filter characteristic curve input by the user. This frequency characteristic input table has a plurality of entries, and each entry stores a frequency value and a gain value as one set. Each entry of the frequency characteristic input table is pointed by a pointer. The pointer is the work memory 12
, And is controlled to always point to the entry next to the entry written last.

Hereinafter, main registers, counters, flags and the like used in this embodiment will be described. In addition, other than the following will be described as needed. (1) Filter characteristic setting flag: Stores the filter characteristic setting mode. (2) Input selection flag: In the filter characteristic setting mode, whether the state is a state of inputting a frequency value or a state of inputting a gain value is stored. (3) New panel data register: stores panel data obtained by the current panel scan. (4) Old panel data register: stores panel data obtained by the previous panel scan. (5) Panel event map: The presence or absence of a panel event is stored. (6) Lowest frequency register: stores the lowest frequency of the target frequency band. (7) Maximum frequency register: stores the maximum frequency of the target frequency band. (8) Parameter register: a work register used in a parameter determination process described later, and stores a combination of parameters. (9) Frequency register: This is a register for a work used in the parameter determination processing, and stores a frequency (hereinafter, referred to as a “sweep frequency”) as a variable x in the above equation (2). (10) Accumulator: a register for work used in the parameter determination processing, and stores a difference value (details will be described later). (11) Minimum sum register: This is a work register used in the parameter determination processing, and stores the minimum value of the sum of difference values (details will be described later). (12) Optimal parameter register: stores a parameter set that is finally set in the sound source 18.

Returning to the description of the block diagram of the parameter setting device shown in FIG. The operation panel 14 includes an operator 15 and a display device 16. FIG. 2 shows an example of the operation panel 14. As shown in FIG. 2, the operation element 15 includes a filter characteristic setting switch 150, an input selection switch 151, a decision switch 152, and a volume setting switch 15.
3, a tone color selection switch 154, an effect selection switch 155, a dial 166, and the like. FIG. 2 shows only those necessary for describing the first embodiment.

The filter characteristic setting switch 150 is constituted by, for example, a push button switch, and is used to shift the electronic musical instrument to the filter characteristic setting mode when the user sets the parameters of the digital filter. The setting state of the filter characteristic setting switch 150 is stored by the above-described filter characteristic setting flag. The filter characteristic setting flag is inverted each time the filter characteristic setting switch 150 is pressed. That is, when the filter characteristic setting switch 150 is pressed when the filter characteristic setting mode is not in the filter characteristic setting mode (when the filter characteristic setting flag is "0"), the filter characteristic setting flag is set to "1" and the mode shifts to the filter characteristic setting mode. On the other hand, when the filter characteristic setting switch 150 is pressed in the filter characteristic setting mode (when the filter characteristic setting flag is "1"), the filter characteristic setting flag is cleared to "0" and the mode shifts to the normal mode.

The input selection switch 151 is composed of, for example, a push button switch, and is used by a user to select whether to input a frequency value or a gain value in the filter characteristic setting mode. This input selection switch 151
Is stored by the input selection flag described above. The input selection flag is inverted each time the input selection switch 151 is pressed. That is, when the input selection switch 151 is pressed in a state where a frequency value is input (the input selection flag is “0”), the input selection flag is set to “1”, and the state shifts to a state where a gain value is input. On the other hand, if the input selection switch 151 is pressed while the gain value is being input (the input selection flag is "1"), the input selection flag is cleared to "0" and the state shifts to the state of inputting the frequency value.

The confirmation switch 152 is composed of, for example, a push button switch, and is used by the user to instruct the end of the input of the frequency value and the gain value in the filter characteristic setting mode. When the confirmation switch 152 is pressed, a filter characteristic curve is generated based on the contents of the frequency characteristic input table input by the user, and displayed on the display device 166 described later.

The volume setting switch 153 is constituted by, for example, a push button switch, and is used to shift the electronic musical instrument to a volume setting mode. Tone selection switch 154
Is constituted by, for example, a push button switch, and is used to shift the electronic musical instrument to the tone color selection mode. The effect selection switch 155 is composed of, for example, a push button switch, and is used to shift the electronic musical instrument to the effect selection mode.

The dial 156 is composed of, for example, a rotary encoder.
Control is performed so that the numerical value decreases by turning it to the left.
The dial 156 is used to input various numerical values. For example, in the filter characteristic setting mode, it is used to input a frequency value and a gain value. In addition, they are used to input a volume value in the volume setting mode, a timbre number in the timbre selection mode, and an effect number in the effect selection mode.

The filter characteristic setting switch 150, the input selection switch 151, the volume setting switch 153, the tone selection switch 154, and the effect selection switch 155.
And the indicators 160, 161, 16 respectively
3, 164 and 165 are provided. These indicators are turned on / off in accordance with data from the CPU 10, and indicate whether each switch is on. For example, the indicator 160 is turned on when the electronic musical instrument is in the filter characteristic setting mode, and is turned off when not. The indicator 161 is
Lights off when the frequency value is being input, and lights up when the gain value is being input.

The display device 166 is, for example, an LCD
It is composed of a display device. This display device 16
Reference numeral 6 is used to display various messages according to display data from the CPU 10. The display device 166 is used to display the filter characteristics in a diagram.

An operator 15 included in the operation panel 14
Are connected to the bus 20 via the panel scan circuit 13. The panel scan circuit 13 scans the operation device 15 and generates panel data based on the obtained signals. This panel data is composed of switch data and dial data. The switch data is composed of a bit string in which each switch corresponds to one bit.
The dial data is composed of data indicating the rotation direction of the dial 156 and the presence or absence of displacement. The panel scan circuit 13 sends the panel data to the CPU 10.

Note event interface circuit 17
Controls transmission and reception of note information between the electronic musical instrument and an external device. Examples of the external device include a device capable of transmitting / receiving note information, such as a keyboard device, a MIDI device, and a sequencer. The note event interface circuit 17 can be configured according to an interface conforming to the MIDI standard, a unique serial or parallel interface, or the like. The above note information includes
A note number for specifying the pitch and a velocity for specifying the strength of the sound are included. Note information having a velocity value of zero is treated as note information instructing mute, and other note information is treated as note information instructing sound generation.

The sound source 18 has a plurality of tone generation channels and is configured to generate a plurality of musical tones simultaneously. The sound source 18 generates a digital tone signal based on the tone color parameters sent from the CPU 10. The sound source 18 includes, in addition to the digital filter according to the present invention, a digital effect adding circuit that applies an effect such as reverb or chorus to a musical sound.

The digital tone signal generated by the tone generator 18 is converted into an analog tone signal by the D / A converter 180 and sent to the amplifier 181. The amplifier 181 amplifies the input analog musical tone signal at a predetermined amplification factor. The signal from the amplifier 181 is supplied to a speaker 182. Then, the electric signal is converted into an acoustic signal in the speaker 181 to generate a musical sound.

Next, a procedure for operating the parameter setting device to set parameters in the digital filter included in the sound source 18 will be described. The user first presses the filter characteristic setting switch 150 in the normal mode.
Thereby, the indicator 160 is turned on and the filter characteristic setting flag is set to “1”, and the electronic musical instrument shifts to the filter characteristic setting mode. Immediately after entering the filter characteristic setting mode, the input selection flag is cleared to “0”, and the state is in which a frequency value is input. Immediately after the electronic musical instrument is set to the filter characteristic setting mode, the display device 166 displays only the frequency axis (X axis) and the gain axis (Y axis) of the graph representing the filter characteristic. That is, the display device 166 displays an image in which, for example, a straight line and a broken line connecting between * and * are removed from the diagram shown in FIG.

[0048] In this state, the user inputs a desired frequency value by operating the dial 156, for example, the f ₁ in FIG. Next, the user presses the input selection switch 151. As a result, the indicator 161 is turned on and the input selection flag is set to “1”, and the electronic musical instrument shifts to a state of inputting a gain value. In this state, the user inputs a desired gain value by operating the dial 156, for example, the g ₁ in FIG. Accordingly, an asterisk is displayed at the intersection of f ₁ and g _{1 on} the screen of the display device 166. Further, these f ₁ and g ₁ are stored at the positions indicated by the pointers in the frequency characteristic input table (see FIG. 4),
Thereafter, the pointer is incremented.

Next, the user operates the input selection switch 151.
push. As a result, the indicator 161 is turned off and the input selection flag is cleared to “0”, and the electronic musical instrument shifts to a state of inputting a frequency value. In this state, the user inputs a desired frequency value by operating the dial 156, for example, f ₂ in FIG. Next, the user presses the input selection switch 151. Thereby, the indicator 16
When 1 lights up, the input selection flag is set to "1", and the electronic musical instrument shifts to a state where a gain value is input. In this state, the user inputs a desired gain value by operating the dial 156, for example, the g ₂ of FIG. This allows
The screen of the display device 166, * with indicia appears at the intersection of the f ₂ and g _2, between the intersection of the f ₁ and g ₁ of intersection and f ₂ and g ₂ are connected by a straight line. Further, at the position indicated by the pointer of the frequency characteristic input table (see FIG. 4), these f ₂ and g ₂ are stored, then the pointer is incremented.

Hereinafter, similarly, the input selection switch 15
By operating 1 and the dial 156, f ₃ , g ₃ , f ₄ and g ₄ are sequentially input. Thereby, as shown in FIG.
The line between the * marks is connected by a straight line, and the filter characteristic curve is displayed in a diagram. Further, as shown in FIG. 4, the frequency value and the gain value are written in four entries of the frequency characteristic input table. In this state, the user refers to the filter characteristic curve (strictly, a broken line) displayed on the display device 166, and finally presses the determination switch 152 when the desired filter characteristic curve is obtained. Thereby, a parameter corresponding to the filter characteristic curve is generated,
The signal is sent to a digital filter built in the sound source 18.

Thereafter, the user presses the filter characteristic setting switch 150. As a result, the indicator 160 is turned off, the filter characteristic setting flag is cleared to “0”, and the electronic musical instrument shifts to the normal mode. In this state, when the note information is input from the note event interface circuit 17, the tone based on the note information is produced in a tone according to the changed filter characteristics. In the first embodiment, the * mark is connected by a straight line, but may be connected by a curve by approximation using, for example, the least square method.

Next, the operation of the electronic musical instrument to which the parameter setting device according to the first embodiment of the present invention is applied will be described in detail with reference to flowcharts. The processing shown in the following flowchart is executed by the CPU 10.

(1-1) Main Processing FIG. 5 is a flowchart showing the main processing. When the power of the electronic musical instrument is turned on, the CPU 10 first performs an initialization process (step S10). In this initialization process,
The sound source 18 is initialized, and initial values of tables, registers, counters, flags, and the like provided in the work area of the work memory 12 are performed. In the part related to the first embodiment, the frequency characteristic input table is all cleared to zero, and the pointer is set to point to the head of the table. Further, the filter characteristic setting flag and the input selection flag are cleared to “0”.

Next, a panel event process is performed (step S11). In this panel event process, it is checked whether any of the switches in the operation unit 15 included in the operation panel 14 has been operated, and when it is determined that the switch has been operated, the process corresponding to the operated switch is performed. Done. The details of the panel event process will be described later.

Next, note event processing is performed (step S12). In this note event process, it is checked whether or not note information has been received. If it is determined that the note information has been received, a sound generation process and a mute process according to the received note information are performed. In the sound generation process, a tone color parameter corresponding to the received note information is read from the program memory 11 and sent to the sound source 18.
As a result, a musical tone corresponding to the note information is generated with a tone color corresponding to the tone color parameter, a pitch specified by the note number, and a strength specified by the velocity. On the other hand, in the mute processing, a sound channel corresponding to the sound designated by the note number is searched, and predetermined data is sent to this sound channel. As a result, the sound being produced is muted.

Next, other processing is performed (step S13). In this "other processing", for example, automatic accompaniment processing, pedal processing, and the like, which are not shown, are performed. afterwards,
Returning to step S11, the same processing is repeated thereafter. When the panel operation or the note information is received in the process of repeatedly executing steps S11 to S13, the processes corresponding to these events are performed, thereby realizing various functions as the parameter setting device and the electronic musical instrument. I have.

(1-2) Panel Event Processing In the panel event processing, first, a panel scan processing is performed (step S20). In this panel scan process, panel data (hereinafter, referred to as “new panel data”) is read from an operator 15 included in the operation panel 14 via the panel scan circuit 13 and stored in a new panel data register. Then, the panel data (hereinafter, referred to as the panel data) read from the operator 15 in the previous panel event process and already stored in the old panel data register
An exclusive OR operation of the “old panel data” and the new panel data is performed. This calculation result is stored in the panel event map. If all the bits of the panel event map are zero, it is determined that no panel event has occurred, and if not, it is determined that a panel event has occurred.

Next, the presence or absence of a panel event is checked (step S21). When it is determined that there is no panel event, the sequence returns from the panel event processing routine to the main processing routine. On the other hand, if it is determined that there is a panel event,
Next, it is checked whether there is an ON event of the filter characteristic setting switch 150 (step S22). This is because the bit corresponding to the filter characteristic setting switch 150 in the panel event map is “1”, and the bit corresponding to the filter characteristic setting switch 150 in the switch data included in the new panel data is “1”. It is done by checking whether or not. The presence / absence of an ON event of each switch described below is checked in a similar manner.

Then, the filter characteristic setting switch 150
Is determined, the filter characteristic setting flag is inverted (step S23). Thus, each time the filter characteristic setting switch 150 is pressed, the normal mode and the filter characteristic setting mode are alternately set. Thereafter, the sequence returns from the panel event processing routine to the main routine.

If it is determined in step S22 that there is no ON event of the filter characteristic setting switch 150, then it is checked whether there is an ON event of the input selection switch 151 (step S24). Then, when it is determined that there is an ON event of the input selection switch 151, the input selection flag is inverted (step S25). Thus, each time the input selection switch 151 is pressed, the state of inputting a frequency value and the state of inputting a gain value are alternately set. Thereafter, the sequence returns from the panel event processing routine to the main routine.

If it is determined in step S24 that there is no ON event of the input selection switch 151, then it is checked whether or not there is an ON event of the confirmation switch 152 (step S26). Then, when it is determined that there is an ON event of the confirmation switch 152, it is checked whether or not the mode is the filter characteristic setting mode (step S27). This is performed by checking the filter characteristic setting flag, and is the same in the following.

If it is determined that the mode is the filter characteristic setting mode, a filter characteristic curve data creation process is performed (step S28). In the filter characteristic curve data creation processing, data representing the filter characteristic curve is generated from the frequency value and the gain value set in the frequency characteristic input table. More specifically, the range from the lowest frequency (for example, 10 Hz) to the highest frequency (20 kHz) is determined based on the intersection of a plurality of frequency values and gain values stored in the frequency characteristic input table, for example, by the least square method. Curve approximation. Next, the obtained curve is equally divided into, for example, 200 on a logarithmic axis, and a gain value at each division point is obtained. Thus the gain value obtained is stored in a predetermined area of the work area of the work memory 12 as the filter characteristic curve data A _n.

Next, filter parameter determination processing is performed (step S29). The filter parameter determination process, the filter parameters to realize a filter characteristic curve that best approximates the filter characteristic curve data A _n obtained in step S28 is determined.
Details of this filter parameter determination processing will be described later.

Next, the filter parameters obtained in step S29 are sent to a digital filter built in the sound source 18 (step S30). Thus, the setting of the filter parameters is completed. Thereafter, the sequence returns from the panel event processing routine to the main processing routine.

If it is determined in step S27 that the mode is not the filter characteristic setting mode, other processing is performed (step S31). In this "other processing"
For example, if the electronic musical instrument is in the volume setting mode, a process of changing the volume in accordance with the contents of a volume register provided in the work area of the work memory 12 is performed. In the effect selection mode, processing for applying an effect such as reverb or chorus is performed according to the contents of the effect number register provided in the work area. Will be Thereafter, the sequence returns from the panel event processing routine to the main processing routine.

In the above step S26, the decision switch 152
Then, if it is determined that there is no ON event, it is checked whether there is an event of the dial 156 (step S32). This is performed by checking whether the portion corresponding to the dial data in the panel event map is zero. Then, when it is determined that there is an event of the dial 156, it is checked whether or not the mode is the filter characteristic setting mode (step S33). Then, when it is determined that the current mode is the filter characteristic setting mode, it is checked whether or not the input selection flag is “0” (step S34). here,
When it is determined that the input selection flag is "0", it is recognized that the frequency value is being input, and the frequency value in the frequency characteristic input table is updated (step S3).
5). That is, in the frequency value column of the frequency characteristic input table,
The dial data portion in the new panel data is stored at the position pointed by the pointer. Thereafter, the sequence returns from the panel event processing routine to the main processing routine.

If it is determined in step S34 that the input selection flag is "1", it is recognized that a gain value is being input, and the gain value in the frequency characteristic input table is updated (step S34). S36). That is, the dial data portion in the new panel data is stored at the position indicated by the pointer in the gain value column of the frequency characteristic input table. Next, the pointer is incremented (step S37). This updates the pointer to point to the next entry. Next, a filter characteristic display process is performed (step S38). In this filter characteristic display processing, the X input in step S35
An asterisk is displayed at the intersection of the frequency value on the axis and the gain value on the Y axis input in step S36, and two data consisting of the frequency value and the gain value input to the frequency characteristic input table are displayed. In the case of above, between these (*
A process of displaying a straight line between the mark and the mark * is performed. Thereafter, the sequence returns from the panel event processing routine to the main processing routine.

If it is determined in step S33 that the mode is not the filter characteristic setting mode, other processing is performed (step S40). In this “other processing”, for example, if the electronic musical instrument is in the volume setting mode, the dial 1
The dial data input at 56 is stored in a volume register as a volume value, in the tone selection mode, the dial data is stored in a tone number register as a tone number, and in the effect selection mode, the dial data is stored in an effect number register as an effect number. , Respectively. The contents of these registers are referred to at the time of sound generation. Thereafter, the sequence returns from the panel event processing routine to the main processing routine.

If it is determined in step S32 that there is no event of the dial 156, another switch process is performed (step S39). In this “other switch processing”, processing associated with operation of switches (not shown) is performed. Thereafter, the sequence returns from the panel event processing routine to the main processing routine. Although illustration and description are omitted, when the sequence returns from the panel event processing routine to the main processing routine, the contents of the new panel data register are transferred to the old panel data register.

(1-3) Filter Parameter Determination Processing Next, the filter parameter determination processing performed in step S29 of the panel event processing will be described with reference to the flowchart of FIG.

In this filter parameter determination process, first, an initialization process is performed (step S50). In this initialization process, first, "10" is set in the lowest frequency register.
However, “20000” is set in the highest frequency register. The initial parameter set f _10, q _10, f ₂₀ and q ₂₀ is stored in the parameter register. Further, a value “10” corresponding to the lowest frequency is stored as the sweep frequency n in the frequency register. Further, the content C _{sum of} the accumulator is cleared to zero. Furthermore,
The maximum value (for example, data of all “1”) is set in the content C _sumold of the minimum sum register.

Next, the filter characteristic curve data A _n created in step S 28 of the panel event processing and stored in the work area of the work memory 12 (the initial value of n is “10” which is the content of the lowest frequency register) Is read (step S51). Next, filter characteristic curve data B _n (the initial value of n is “10” which is the content of the lowest frequency register) is calculated (step S5).
2). In this calculation, the parameter sets f _1i , q _1i , f _2i, and q _2i stored in the parameter register and the sweep frequency n stored in the frequency register are respectively converted into f _c1 , Q _{1 in the} above-described equation (2). , it is performed by substituting the f _c2, Q ₂ and x.

Next, the absolute value C _n of the difference between the filter characteristic curve data _An and the filter characteristic curve data B _n at the current sweep frequency _n is obtained (step S5).
3). Next, the absolute value C _n is accumulated in the content C _sum of the accumulator (step S54). Thereafter, it is checked whether or not the sweep has been completed (step S5).
5). This is performed by checking whether or not the sweep frequency n has exceeded the highest frequency (the content of the highest frequency register, "20000").

If it is determined in step S55 that the sweep has not been completed, the sweep frequency n is updated (step S56). That is, the lowest frequency (10 Hz)
, The value obtained by dividing the highest frequency (20 kHz) into 200 equal parts on the logarithmic axis is added to the sweep frequency n stored in the frequency register. Thereafter, the sequence returns to step S51, and the same processing is repeated thereafter.

On the other hand, if it is determined in step S55 that the sweep has been completed, then it is checked whether or not the content C _{sum of} the accumulator is smaller than the content C _sumold of the minimum sum register (step S57). Here, the contents C _{su m} of the accumulator that is judged smaller than the content C _Sumold minimum sum register, the contents of the accumulator C _sum is transferred to the minimum sum register is the minimum sum value up to the present (step S58). Then, the parameter set used at that time, that is, the contents of the parameter register are saved in the optimum parameter register (step S59). On the other hand, if it is determined in step S57 that the content C _sum of the accumulator is _{equal to} or greater than the content C _sumold of the minimum sum register, the processing in steps S58 and S59 is skipped. Thereby, the parameter set f when the content C _{sum of} the accumulator becomes the smallest is stored in the optimum parameter register.
_1i, so that q _{1 i,} f _2i and q _2i is left.

Next, all the parameter sets f _1i , q
_It is checked whether or not the processing for _1i , f _2i and q _2i , that is, processing for all combinations of parameters has been completed (step S60). If it is determined that the process has not been completed, the next parameter set is set in the parameter register (step S61). Thereafter, the sequence returns to step S51, and the same processing is repeated thereafter.
On the other hand, when it is determined in step S60 that processing for all parameter sets has been completed, the sequence is:
The process returns from the filter parameter determination processing routine to the panel event processing routine. At this point, a parameter set for realizing a filter characteristic curve most similar to the filter characteristic curve input by the user is:
It is set in the optimal parameter register.

According to the parameter setting device according to the first embodiment, when the user operates the operation panel 14 and inputs a filter characteristic curve, a parameter corresponding to the filter characteristic curve is generated. Since the setting is performed, the user can easily and quickly set a parameter that can obtain a filter characteristic as imagined in a short time. Further, since necessary information can be input while looking at the filter characteristic curve displayed on the display device 166, the filter characteristics can be intuitively grasped, and the parameter setting operation is simplified.

In the first embodiment, the sweep frequency n ranges from 10 Hz to 20 kHz on the logarithmic axis.
Although the value is sequentially incremented in units of values obtained by equally dividing into 0, the value is not limited to 200 and can be equally divided into any number. Also, the sweep frequency n
May be a value obtained by equally dividing a plurality on a normal frequency axis instead of on a logarithmic frequency axis. Further, the frequency band to be processed is not limited to the range from 10 Hz to 20 kHz, and can be arbitrarily determined.

(Embodiment 2) Next, a parameter setting device according to Embodiment 2 of the present invention will be described with reference to the drawings. This parameter setting device allows the user to arbitrarily set the minimum frequency and the maximum frequency.

The configuration of this parameter setting device is the same as that shown in the block diagram of FIG. 1, except for the configuration of the operation panel 14 '. That is, as shown in FIG. 10, the operation panel 14 'according to the second embodiment is different from the operation panel 14 according to the first embodiment shown in FIG.
57, an indicator 167 indicating ON / OFF of the highest frequency switch 158 and the lowest frequency switch 157, and an indicator 168 indicating ON / OFF of the highest frequency switch 158 are additionally provided.

In the work area of the work memory 12, a lowest frequency flag and a highest frequency flag are further provided. The lowest frequency flag is a flag for storing whether or not the lowest frequency is set, and is inverted each time the lowest frequency switch 157 is pressed. Similarly,
The highest frequency flag is a flag for storing whether or not the highest frequency is set, and is inverted each time the highest frequency switch 158 is pressed.

Next, the procedure for setting the lowest frequency and the highest frequency by operating this parameter setting device will be described. The user first presses the lowest frequency switch 157. As a result, the indicator 167 is turned on, the lowest frequency flag is set to “1”, and the electronic musical instrument enters a state of inputting the lowest frequency. In this state, the user operates dial 156 to input the lowest frequency. This lowest frequency is stored in the lowest frequency register.

Next, the user sets the highest frequency switch 15
Press 8. As a result, the indicator 168 is turned on, the highest frequency flag is set to “1”, and the electronic musical instrument enters a state of inputting the highest frequency. In this state,
The user operates dial 156 to input the highest frequency. This highest frequency is stored in the highest frequency register.

Next, the operation of the electronic musical instrument to which the parameter setting device according to the second embodiment of the present invention is applied will be described in detail with reference to flowcharts. The processing shown in the following flowchart is executed by the CPU 10.

(2-1) Main Processing The main processing of the parameter setting device according to the second embodiment is the same as that of the first embodiment.

(2-2) Panel Event Processing In the panel event processing according to the second embodiment, processing corresponding to the operation of the lowest frequency switch 157 and the highest frequency switch 158 is added to the panel event processing of the first embodiment. That is, steps S70 to S73 and steps S80 to 83 are added.

In the following, the same portions as those of the panel event process of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted or simplified, and the description will focus on the added steps. This panel event processing is started, and step S
If it is determined at 26 that there is an ON event of the decision switch 152, a process of setting the filter parameters in the sound source 18 from step S27 onward is performed.

On the other hand, if it is determined in step S26 that there is no ON event of the decision switch 152, then it is checked whether there is an ON event of the lowest frequency switch 157 (step S70). Here, when it is determined that there is an ON event of the lowest frequency switch 157, the lowest frequency flag is inverted (Step S).
71). Thus, each time the lowest frequency switch 157 is pressed, the state of inputting the lowest frequency value and the state of not inputting the lowest frequency value are reversed. Thereafter, the sequence returns from the panel event processing routine to the main routine.

If it is determined in step S70 that there is no ON event of the lowest frequency switch 157, then it is checked whether there is an ON event of the highest frequency switch 158 (step S72). Here, when it is determined that there is an ON event of the highest frequency switch 158, the highest frequency flag is inverted (step S).
73). Thus, each time the highest frequency switch 158 is pressed, the state of inputting the highest frequency value and the state of not inputting the highest frequency value are reversed. Thereafter, the sequence returns from the panel event processing routine to the main routine.

If it is determined in step S72 that there is no ON event of the highest frequency switch 158, then it is checked whether there is an event of the dial 156 (step S32), and it is determined that there is a dial event. Then, it is checked whether the mode is the filter characteristic setting mode (step S33). here,
If it is determined that the mode is not the filter characteristic setting mode, then it is checked whether or not the lowest frequency flag is "1" (step S80). If it is determined that the lowest frequency flag is "1", it is recognized that the lowest frequency is currently being input, and the dial data in the new panel data is stored in the lowest frequency register (step S81). ). Thereafter, the sequence returns from the panel event processing routine to the main routine.

If it is determined in step S80 that the lowest frequency flag is not "1", then it is checked whether the highest frequency flag is "1" (step S32). If it is determined that the highest frequency flag is "1", it is recognized that the highest frequency is currently being input, and the dial data in the new panel data is stored in the highest frequency register (step S8).
3). Thereafter, the sequence returns from the panel event processing routine to the main routine.

If it is determined in step S82 that the highest frequency flag is not "1", other processing is performed (step S40), and then the sequence returns from the panel event processing routine to the main routine. Note that if it is determined in step S32 that there is no event of the dial 156, and
The processing in the case where it is determined that the mode is the filter characteristic setting mode is the same as that in the first embodiment described above.

With the above processing, the user can input the lowest frequency by operating the lowest frequency switch 157 and the dial 156, and input the highest frequency by operating the highest frequency switch 158 and the dial 156, respectively.

As described above, according to the parameter setting device according to the second embodiment, the user can specify the band for which the frequency characteristic of the filter is to be changed by the lowest frequency and the highest frequency. Can be set to realize a filter characteristic having a characteristic in an arbitrary part of.

In the above-described parameter setting device according to the embodiment of the present invention, a case has been described in which a parameter defining a filter characteristic is set as one of the tone characteristics. However, the present invention is not limited to this. This can be applied when setting parameters for realizing various musical sound characteristics.

Further, the present invention is not limited to the above-described embodiment, and various changes can be made based on the technical idea of the present invention.

[0097]

As described in detail above, according to the present invention,
It is possible to provide a parameter setting device capable of setting parameters for obtaining a desired tone characteristic with a simple operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an electronic musical instrument to which a parameter setting device according to Embodiments 1 and 2 of the present invention is applied.

FIG. 2 is a diagram showing a configuration of an operation panel of the electronic musical instrument to which the parameter setting device according to the first embodiment of the present invention is applied.

FIG. 3 is a diagram showing a parameter table used in an electronic musical instrument to which the parameter setting device according to the first and second embodiments of the present invention is applied.

FIG. 4 is a diagram showing a frequency characteristic input table used in an electronic musical instrument to which the parameter setting device according to the first and second embodiments of the present invention is applied.

FIG. 5 is a flowchart showing a main process commonly used in an electronic musical instrument to which the parameter setting device according to the first and second embodiments of the present invention is applied.

FIG. 6 is a flowchart (part 1) illustrating panel event processing of the electronic musical instrument to which the parameter setting device according to the first embodiment of the present invention is applied;

FIG. 7 is a flowchart (part 2) illustrating panel event processing of the electronic musical instrument to which the parameter setting device according to the first embodiment of the present invention is applied.

FIG. 8 is a flowchart showing details of a filter parameter determination process shown in FIGS. 6 and 11;

FIG. 9 is a diagram for explaining a parameter setting operation in an electronic musical instrument to which the parameter setting device according to the first and second embodiments of the present invention is applied.

FIG. 10 is a diagram showing a configuration of an operation panel of an electronic musical instrument to which the parameter setting device according to the second embodiment of the present invention is applied.

FIG. 11 is a flowchart (part 1) illustrating panel event processing of an electronic musical instrument to which the parameter setting device according to the second embodiment of the present invention is applied.

FIG. 12 is a flowchart (part 2) illustrating panel event processing of the electronic musical instrument to which the parameter setting device according to the second embodiment of the present invention is applied.

FIG. 13 is a flowchart (part 3) illustrating panel event processing of the electronic musical instrument to which the parameter setting device according to the second embodiment of the present invention is applied.

[Explanation of symbols]

 10 CPU 11 Program Memory 12 Work Memory 13 Panel Scan Circuit 14 Operation Panel 15 Operator 16 Display 17 Note Event Interface Circuit 18 Sound Source 20 Bus 150 Filter Characteristics Setting Switch 151 Input Selection Switch 152 Confirmation Switch 153 Volume Setting Switch 154 Tone Selection Switch 155 Effect selection switch 156 Dial 157 Lowest frequency switch 158 Highest frequency switch 160, 162 Indicator 166 Display device 163 to 168 Indicator 180 D / A converter 181 Amplifier 182 Speaker

Claims (7)

[Claims] 1. A parameter setting device for setting parameters for determining a tone characteristic in a sound source, comprising: input means for inputting information for designating a tone characteristic curve; A parameter setting device comprising: parameter generation means for generating a parameter based on the parameter; and setting means for setting the parameter generated by the parameter generation means in the sound source. 2. The parameter setting device according to claim 1, further comprising display means for displaying a tone characteristic curve based on the information input by said input means. 3. The parameter generation means includes: storage means for storing a plurality of parameter sets; and a plurality of first curve data representing a tone characteristic curve corresponding to each of the plurality of parameter sets stored in the storage means. First data generating means for generating; second data generating means for generating second curve data representing a tone characteristic curve corresponding to the information input by the input means; and generating by the first data generating means. Detecting means for detecting, from among the plurality of first curve data obtained, the data most similar to the second curve data generated by the second data generating means, wherein the curve detected by the detecting means is provided. The parameter setting device according to claim 1, wherein the parameter setting device outputs a parameter set corresponding to the data. 4. The parameter setting device according to claim 1, wherein the tone characteristics are frequency characteristics of a filter included in the sound source. 5. The method according to claim 1, wherein said detecting means detects the magnitude of said first curve data and said second curve data at all division points when a frequency band defined by a lowest frequency and a highest frequency is divided into a plurality of equal parts. 5. The parameter setting device according to claim 4, wherein the sum of the differences from the magnitudes is calculated for all the first curve data, and the smallest one is selected from the plurality of sums. 6. The detection by said detecting means includes determining the size of said first curve data at all division points when a frequency band defined by a lowest frequency and a highest frequency is equally divided on a logarithmic axis. 5. The parameter setting device according to claim 4, wherein a total sum of a difference from the size of the second curve data is obtained for all the first curve data, and the smallest one is selected from the plurality of total sums. 7. The parameter setting device according to claim 5, further comprising frequency input means for inputting a lowest frequency and a highest frequency.