JPH0981135A - Electronic musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb variance of touch data due to key load variation against will and to follow the change in the touch data by generating a correction value and correcting the detected touch data with a correction value before outputting. SOLUTION: CPU 1 is central processing unit which controls the entire electronic musical instrument based on the control program stored in ROM 5. Also, the CPU 1 incorporates a timer circuit and a serial/parallel I/O interface circuit which carries out interruption to CPU 1 at a preset cycle. And, a correction value is generated based on the difference between the detected touch data and last output touch data, and the detected touch data is corrected according to the correction value and outputted. Therefore, for example, when the detected touch data has variance within a prescribed range, correction is made so as to decrease the variation, while bare touch data are outputted without correction when key is depressed rapidly and strong or weekly.

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 having a touch data averaging function capable of following a rapid change in touch.

[0002]

2. Description of the Related Art In a conventional electronic musical instrument such as an electronic piano, as disclosed in, for example, Japanese Unexamined Patent Publication No. 4-376896, a hammer system (weight) is loaded at the time of key-on depending on the strength of a keystroke or repeated hits. Even if the manner of addition changes, the touch data averaging process is performed in order to calculate the keystroke strength (touch data or velocity data) that is not easily affected by the change.

[0003]

In the averaging process of the conventional electronic musical instrument, a fixed weighting coefficient is used and the averaging process with the previous touch data is simply performed. When the touch is changed, there is a problem that the change is not smoothed by the averaging process and the change in the touch cannot be faithfully followed. Further, there is a problem that an arithmetic operation including multiplication is required for the averaging process, resulting in a processing delay. An object of the present invention is to provide an electronic musical instrument having a touch data averaging function capable of solving the above-mentioned problems of the prior art and being able to follow a rapid change in touch with a simple process. is there.

[0004]

According to the present invention, there is provided an electronic musical instrument having touch data detecting means, and correction value generating means for generating a correction value based on a difference between detected touch data and previous output touch data. And a correction unit that corrects the detected touch data with a correction value and outputs the corrected touch data.

The present invention has the above-mentioned structure and, for example,
If the detected touch data has a variation within a predetermined range, correction is performed to reduce the variation,
Further, when the key is suddenly strongly or weakly touched, the touch data is output as it is without correction. Therefore, it is possible to absorb the variation of the touch data due to the unexpected change of the key load and to follow the rapid change of the touch data.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment of an electronic musical instrument of the present invention. CPU1
A central processing unit that controls the entire electronic musical instrument based on a control program stored in the ROM 5. Further, a timer circuit for interrupting the CPU 1 at a predetermined cycle set in advance and a serial / parallel input / output interface circuit are incorporated. The MIDI interface circuit 2 is a circuit that transmits and receives MIDI data to and from an external MIDI device, and is connected to the serial interface circuit of the CPU 1.

The panel circuit 3 and the pedal circuit 4 are composed of various switches for selecting a timbre, a wheel operator, a display device for displaying characters and the like by a liquid crystal or an LED, or a switch equipped on the pedal.
Connected to the parallel interface circuit. R
The OM 5 stores a control program, tone color parameters, frequency information table, and the like. The RAM 6 is used as a work area and a buffer and also stores the panel state and the like. Further, it may be backed up by a battery or the like.

The keyboard 8 is composed of a plurality of keys each having two switches, which are performance operators, and each key realizes a hammer mechanism similar to a piano or a touch feeling similar to the hammer mechanism. In addition, it is equipped with a weight mechanism that simulates a hammer mechanism. The scan circuit 7 is composed of a circuit that scans the states of a plurality of switches on the keyboard 8 and, when detecting a state change, generates information such as key-on, key-off, and touch, and notifies the CPU 1 of the information.

Regarding generation of touch information, for example, a plurality of registers for generating touch information T are provided, and one of the registers is assigned in response to the first switch-on of an arbitrary key, and the registers are assigned to the registers. For example, 32767 (7FFFH) is set as the initial value of T. Then, every predetermined period until the second switch of the key is turned on,
New T = old T * 127/128 is calculated. This operation can be performed by right shifting the value of T by 7 bits and subtracting it from the original T. Then, the upper 8 bits of the register value when the second switch is turned on are output as touch information. Therefore, the more you hit the key, 127 (7FH)
A large value close to is output.

The tone generator circuit 9 is a circuit for generating a musical tone signal by, for example, a waveform reading method, and sequentially generates musical tone waveforms at an address interval proportional to a pitch to be generated from a waveform memory 10 in which digital musical tone waveform information is stored. Is read out and interpolation calculation or the like is performed to generate a tone waveform signal. Further, it has an envelope signal generating circuit, multiplies the musical tone waveform signal by the envelope signal generated based on the set envelope parameter to give an envelope, and outputs the musical tone signal. The tone generator circuit 9 has a plurality of tone generation channels. However, in practice, one tone generation circuit is time-division multiplexed to simultaneously generate a plurality of tone signals independently. There is.

The D / A converter 11 converts the digital tone signal into an analog signal, and the tone signal amplified by the amplifier 12 is sounded by the speaker 13. The bus 14 connects each circuit in the electronic musical instrument. If necessary, a floppy disk drive circuit, a memory card interface circuit, etc. may be provided.

FIG. 2 is a flow chart showing the main processing of the CPU 1. When the power of the electronic musical instrument is turned on, the data in the tone generator circuit 9 and the RAM 6 are initialized in step S1. In step S2, the status information of various switches on the panel is fetched, the status change is detected, and if there is a status change, that is, a panel event,
Perform the corresponding process. In step S3, the state information of the pedal switch is fetched, the state change is detected, and if there is a state change, that is, a pedal event,
Perform the corresponding process.

In step S4, the scan circuit 7
From this, it is determined whether or not any key event is notified, and if the result is negative, the process proceeds to step S2.
In the affirmative case, the process proceeds to step S5. Step S5
In step 1, it is determined whether or not the key event is a key-on event. If the result is affirmative, a publicly-known key assign process (not shown) is performed, and then the process proceeds to step S7. In S6, the key-off process, that is, the process of attenuating the assigned tone generation level of the tone generation channel and opening the tone generation channel is performed.

In step S7, the manipulator speed (touch information T) input from the scan circuit 7 is converted into velocity data Vi using, for example, a data table. This conversion process converts the touch characteristic peculiar to the keyboard device 8 into standard touch information, and by this process, it becomes unnecessary to consider the touch characteristic peculiar to the keyboard in the subsequent processes.

In step S8, an averaging process described later is performed, and the velocity data Vi is corrected to Vo. In step S9, the corrected velocity data Vo is set as an envelope parameter (attack level parameter) in the parameter storage area corresponding to the sounding channel assigned to the tone generator circuit 9. As a result, the tone generation level of the tone signal is controlled by a known method. In step S10, other tone generation parameters are set in the parameter storage area of the tone generator circuit 9, and in step S11, a tone generation start instruction is transferred to the tone generation channel to start tone generation processing.

FIG. 3 is a flow chart showing the contents of the averaging process in step S8 of FIG. In step S20, the correction value J is calculated using the conversion table based on the value obtained by subtracting the previous averaged velocity data VA from the velocity data Vi converted in step S7.
Ask for.

FIG. 4 is an explanatory diagram showing an example of the contents of the conversion table used in step S20. The horizontal axis is (Vi-VA) and can take values from -127 to +127. However, as shown in the figure, when the absolute value is 16 or more, the correction values J are all 0. Therefore, only the correction value J when the absolute value is 15 or less is stored in the conversion table,
The correction may be performed only when the absolute value of (Vi-VA) is 15 or less. When the absolute value of the difference is 5 or less, the correction value J is a value obtained by inverting the sign of the difference, that is, J = − (V
i-VA). And the absolute value is 6 to 15
The absolute value linearly decreases from-(Vi-VA) to 0 with the transition to. In the example shown in FIG. 4, the correction value J has a characteristic that it changes linearly.
Since the conversion table is used, an arbitrary curve characteristic can be realized as the characteristic of the correction value J.

Returning to FIG. 3, in step S21, a new VA is obtained by adding the correction value J to Vi.
Ask for. This VA becomes the same value as the original VA by the correction when Vi is within the original VA ± 5 range, and when Vi is outside the original VA ± 15 range,
It has the same value as i.

In step S22, it is determined whether or not the key-on is the same continuous hit within a predetermined time. If the result is negative, the process proceeds to step S25, but if the result is affirmative, the process proceeds to step S23. . In step S23, the correction value K is calculated using the second conversion table based on the value obtained by subtracting Vm, which is the previous output velocity value at the same key number as the current key-on, from the velocity data VA corrected in step S21. Ask for.

FIG. 5 is an explanatory diagram showing an example of the contents of the second conversion table used in step S23. The horizontal axis is (VA -Vm), which is also -127 to +127.
Can take values up to. However, as shown in the figure, when the absolute value is 21 or more, the correction values K are all 0. Therefore, only the correction value K when the absolute value is 20 or less is stored in the second conversion table, and the absolute value of (VA-Vm) is 20.
The correction may be performed only in the following cases. The correction value K is J =-(VA-V when the absolute value of the difference is 5 or less.
m) is a value. Then, as the absolute value shifts from 6 to 21, the absolute value linearly decreases from − (VA −Vm) to 0. In the example shown in FIG. 5, the correction value K has a characteristic that changes linearly, but since a conversion table is used, an arbitrary curve characteristic can be realized as the characteristic of the correction value K. .

Returning to FIG. 3, in step S24, a new VA is obtained by adding the correction value K to VA.
Ask for. This VA becomes the same value as Vm by the correction when the original VA is within the range of Vm ± 5, and
If the original VA is outside the range of Vm ± 20, the original V
It has the same value as A. In step S25, VA is substituted for the output velocity data Vo of the averaging process and Vm corresponding to the current key number of the plurality of Vm stored for each key number, and both data are updated.

When the touch strength is within the predetermined range by the above-described processing, the averaging processing suppresses unintentional fluctuations and facilitates replay, and the touch strength exceeds the predetermined range. In this case, the rounding due to the averaging process is eliminated, and the actual touch strength is faithfully followed. Further, since the correction value is generated by the conversion table, a time-consuming calculation such as multiplication is unnecessary, and the processing delay is reduced.

Next, a second embodiment will be described. In the averaging process of FIG. 3 in the first embodiment, if the same key is repeatedly hit within a predetermined time after performing the correction once in steps S20 and S21, step S2
In 3 and 24, the correction is performed again. Here, when the same key is repeatedly hit, Vm is the immediately preceding Vo and V
Same as A. Therefore, the corrections in steps S20 and S21 and the corrections in steps S23 and S24 can be performed by one correction process based on (Vi-VA) or (Vi-Vm). In the second embodiment, the condition is first branched, and the correction is performed by one-time correction processing.

FIG. 6 is a flowchart showing a second embodiment of the averaging process. In step S30, it is determined whether or not the same key is repeatedly hit. If the result is negative, the process proceeds to step S33, but if the result is affirmative, the process proceeds to step S31. In step S31,
It is determined whether or not the interval of repeated hits is within a predetermined T1 time. If the result is negative, the process proceeds to step S33, but if the result is affirmative, the process proceeds to step S32.

In step S32, it is determined whether or not the interval between repeated hits is within a predetermined T2 time shorter than T1. If the result is negative, the process proceeds to step S34, but if the result is affirmative, step S35 is performed. Move to. In step S33 (Vi-VA), step S34,
In step 35, the correction value L is calculated based on the value of (Vi-Vm) using Table 1, Table 2 or Table 3, respectively. Table 1 has, for example, the contents shown in FIG. 4 in the first embodiment.
Is a combination of the contents of the conversion table of FIG. 4 and the contents of the second conversion table of FIG. 5, and Table 3 is a combination of the contents of the second conversion table of FIG. 5 twice. May be.

In step S36, a new VA is obtained by adding the correction value L to Vi. In step S25, VA is substituted for the output velocity data Vo of the averaging process and Vm corresponding to the current key number among the plurality of Vm stored for each key number, and both data are updated. With such processing, the correction is completed by one correction processing. Further, in the case of continuous hitting of the same key, it becomes possible to perform correction with different characteristics for each time range.

Although the embodiment has been described above, the following modifications are also possible. In the correction process for the same repeated hits in steps S22 to S24, the correction is performed based on the difference from the previous velocity data of the same key, but instead of this process, for example, from the previous key-on or key-off of the same key to this time. The correction may be performed based on the time until the key is turned on. In this case, first, the time t from the previous key-off of the same key is obtained. For this purpose, for example, at each key-off, a key-off timer that can measure at least the time when the hammer returns and stops is activated, and when the key is turned on, it is checked whether or not the key-off timer is operating for the same key. Then, if the timer is operating, the measured value t of the timer is read. Then, the measured value t is converted into a velocity correction value D using a conversion table or the like, and VA
The correction value D is added to. The velocity correction value is obtained from the change in the detected touch information when the time interval is changed by actually hitting the key repeatedly. By doing so, it is possible to more accurately obtain the touch information at the time of the same continuous hit.

In the first embodiment, an example in which the first conversion table and the second conversion table have different characteristics is disclosed, but the characteristics of each table are arbitrary and the contents of both tables are They may be the same or may be corrected twice using one table. Further, since the hammer system has different weights and operating characteristics depending on the range, a conversion table is provided for each range or for hammer systems with different characteristics so that different correction values are output for each range depending on the hammer system. May be.

In the embodiment, the example in which the correction value is generated by the conversion table is disclosed, but the correction value can be calculated by calculation. For example, in the case of the characteristics shown in FIG. 4, the range is divided according to the value of (Vi-VA), and when | Vi-VA | <6, J =-(Vi-V
If A), 5 <(Vi-VA) <16, then J =
[(Vi-VA) / 2] -8, -16 <(Vi-VA)
<=-5, J = [(Vi-VA) / 2] +8,
The correction value J can be obtained by performing the following calculation.

When a predetermined time has passed since the last key-on, the values of VA, Vm, etc. may be initialized. Alternatively, the values of VA, Vm, etc. may be corrected so as to approach the initial values with the passage of time. The initial values of VA, Vm, etc. may be intermediate values of velocity values, for example. Further, the averaging process may not be performed for the first key-on after a predetermined time has passed from the last key-on or key-off. The present invention can be applied not only to keyboard musical instruments such as electronic pianos, but also to any electronic musical instruments having operators for performance.

[0031]

As described above, according to the present invention, in the electronic musical instrument having the touch data detecting means, based on the difference between the detected touch data and the previous output touch data,
Since the correction value generation means for generating the correction value and the correction means for correcting the detected touch data with the correction value and outputting the correction result are provided, for example, when the detected touch data has a variation within a predetermined range, Correction is performed so as to reduce variations, and when keys are suddenly strongly or weakly touched, the touch data is output as it is without being corrected. Therefore, it is possible to absorb the variation in the touch data due to the unexpected change in the key load and to follow the rapid change in the touch data.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of an electronic musical instrument of the present invention.

FIG. 2 is a flowchart showing a main process of a CPU.

FIG. 3 is a flowchart showing the contents of averaging processing in S8 of FIG.

FIG. 4 is an explanatory diagram showing an example of contents of a conversion table.

FIG. 5 is an explanatory diagram showing an example of contents of a second conversion table.

FIG. 6 is a flowchart showing a second embodiment of the averaging process.

[Explanation of symbols]

1 ... CPU, 2 ... MIDI interface circuit, 3 ...
Panel circuit, 4 ... Pedal circuit, 5 ... ROM, 6 ... RA
M, 7 ... Scan circuit, 8 ... Keyboard, 9 ... Sound source circuit, 10
... Waveform memory, 11 ... D / A converter, 12 ... Amplifier, 1
3 ... speaker, 14 ... bus

Claims (3)

[Claims] 1. An electronic musical instrument having touch data detection means, correction value generation means for generating a correction value based on a difference between detected touch data and previous output touch data, and correction value for the detected touch data. An electronic musical instrument characterized by comprising: 2. The correction value generating means comprises a conversion table, and the correction value stored in the conversion table has a sign of the difference when the absolute value of the difference is equal to or smaller than a first predetermined value. The electronic musical instrument according to claim 1, wherein the electronic musical instrument has an inverted value and is zero when the absolute value of the difference is equal to or larger than a second predetermined value that is larger than the first predetermined value. 3. A second correction value generation means for generating a second correction value based on the difference between the output touch data of the correction means and the previous output touch data of the same operator, and the correction means. A second correction unit that corrects and outputs the output touch data according to the second correction value, and determines whether or not the touch data to be processed is due to the operation of the same operator within a predetermined time, The electronic musical instrument according to claim 1, further comprising: a second correction value generation means and a determination means for activating the second correction means when the operation is performed by the same operator within a predetermined time.