JP2010020140A - Musical performance controller, performance operation element, program, and performance control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make strength and weakness of musical sound generated in accordance with a movement of a performance operation element approximate a player's sense of shaking the performance operation element. <P>SOLUTION: When a peak detection part 26 detects a peak P having an acceleration magnitude larger than a lower limit value PR<SB>LOW</SB>of a peak detection range and smaller than an upper limit value PR<SB>UPP</SB>thereof from an acceleration waveform showed by acceleration data AS, it delivers the acceleration data AS of the peak P to a performance control part 27. Then, the performance control part 27 maps the acceleration data AS delivered from the peak detection part 26 on a velocity range according to a mapping rule, and outputs performance data in which a velocity of the mapping point is written to a MIDI sound source 40. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a performance control apparatus that performs a performance in response to a swing operation of a performance operator.

There is a performance control device that quantifies the acceleration applied to the performance operator held by the performer's hand with an acceleration sensor and generates a musical tone of velocity corresponding to the acceleration of the peak every time a peak of the acceleration waveform is detected. . According to this performance control device, the performer is able to achieve his intention by performing a simple operation such as `` shake the performance controller strongly to make a loud sound and shake the performance operator weakly to make a small sound. '' You can play the matching performance sound. In addition, this kind of performance control apparatus is disclosed by patent document 1, for example.
JP 2004-53930 A

When this type of performance control device detects the peak of the acceleration waveform, it divides the acceleration of the peak by a preset conversion coefficient to convert the acceleration into velocity, and causes the tone of the converted velocity to be generated from the sound source. . However, if such a linear conversion is performed without taking any measures, a small acceleration that is converted every time a small acceleration that should not be interpreted as the sounding timing intended by the performer is detected as a peak. The sound will be heard and the performance will be far from the performer's intention. In order to avoid such inconvenience, many performance control apparatuses of this type detect acceleration waveform peaks, compare the detected peak acceleration with a relatively small threshold value, and divide only the acceleration exceeding the threshold value by the conversion coefficient. By doing so, conversion control is performed to convert to velocity.
However, when performing such conversion control, depending on how the threshold value is set, it is difficult to produce a sound even if the performance operator is shaken. The problem of sudden pronunciation arises. In addition, if the value of the conversion coefficient used for conversion from acceleration to velocity is too small, a musical sound with a large velocity will be produced even if you intend to shake the performance controller weakly, while if the value of the conversion coefficient is too large, There is also a problem that even if you intend to shake the controller strongly, only a small velocity sound is produced.
The present invention has been devised under such a background, and aims to bring the intensity of a musical sound to be generated in accordance with the behavior of a performance operator closer to that of a player swinging the performance operator. To do.

The present invention provides a peak detecting means for detecting a peak having a physical quantity within a peak detection range having a predetermined width from a physical quantity waveform indicating the behavior of the performance operator, and a physical quantity within the peak detection range having a predetermined width. According to a mapping rule for mapping to a velocity range, there is provided a performance control device comprising performance control means for mapping the magnitude of a physical quantity at a peak detected by the peak detection means to velocity and outputting performance data including the velocity. .
In this invention, the performer performs an improvised performance by holding the performance operator and swinging the performance operator strongly to make a loud sound, and weakly shaking the performance operator to make a small sound. Do. Then, the peak detecting means detects a peak having a physical quantity within a peak detection range of a predetermined width from the physical quantity waveform indicating the behavior of the performance operator, and the performance control means detects the magnitude of the physical quantity at the peak. This is mapped to a velocity range of a predetermined width, and performance data including the mapped velocity is output to the sound source. By this mapping, the correspondence relationship between acceleration and velocity within the peak detection range is optimized, and a musical tone with a strength close to that of a player swinging the performance operator can be generated.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a performance control system including a performance control apparatus 20 according to an embodiment of the present invention. The performance control system includes a performance operator 10, a performance control device 20, and a MIDI (Musical Instrument Digital Interface) sound source 40.
In FIG. 1, a performance operator 10 is a baton-like operator that the player performs operations such as gripping and shaking. The performer performs an improvisational performance in such a manner that when the player wants to make a loud sound, he shakes the performance operator 10 strongly, and when he wants to make a small sound, he shakes the performance operator 10 weakly.
The performance operator 10 includes an acceleration sensor 11 and a wireless communication unit 12. The acceleration sensor 11 detects acceleration, which is a physical quantity indicating the behavior of the performance operator 10. The acceleration sensor 11 detects the acceleration acting on the performance operator 10 by decomposing the acceleration into acceleration components a _x , a _y , a _z in three axis directions orthogonal to each other, and detects these acceleration components a _x , a _y , a _z. Each analog signal indicating is output.

The wireless communication unit 12 samples and digitizes three types of analog signals output from the acceleration sensor 11 at a sampling period of a certain length of time (for example, 5 ms), thereby digitizing the three-axis direction components a _x and a _y. , _Az are generated, and a packet including this data is transmitted to the performance control apparatus 20 via the wireless section.
The performance control apparatus 20 includes an operation display unit 21, a wireless communication unit 22, a control unit 23, and an interface (hereinafter referred to as “I / F”) 28.
The operation display unit 21 receives various instructions from the performer and provides various information to the performer.
The wireless communication unit 22 receives a packet transmitted from the performance operator 10 every sampling period of a certain time length (for example, 5 ms), and data indicating the three-axis direction components a _x , a _y , and a _z from the packet. Is taken out and delivered to the control unit 23.
The control unit 23 includes an acceleration acquisition unit 25, a peak detection unit 26, and a performance control unit 27.
The acceleration acquisition unit 25 inputs the three-axis direction components a _x , a _y , and a _z indicated by the data delivered from the wireless communication unit 22 to the following expression, thereby calculating the acceleration acting on the acceleration sensor 11 of the performance operator 10. The acceleration data AS indicating the magnitude is acquired, and the acceleration data AS is output.
AS = (a _x ² + a _y ² + a _z ² ) ^1/2 (1)

The peak detection unit 26 receives acceleration data from the acceleration acquisition unit 25, detects a peak having the magnitude of acceleration within the peak detection range from the acceleration waveform indicated by the acceleration data, and corresponds to the detected peak. The acceleration data AS is delivered to the performance control unit 27.
Here, the peak detection range will be described. The purpose of this embodiment is to extract the strength of the swing when swinging the performance controller 10 with a willingness to beat, regardless of the habit of the performance operator 10 swinging by the performer and its characteristics. It is to reflect the strength of the performance sound. In order to achieve this object, in the present embodiment, a lower limit value PR _LOW and an upper limit value PR _UPP of acceleration that may be regarded as a player swinging the performance operator 10 with a willingness to beat are obtained in advance, and the lower limit value is obtained. The acceleration range from PR _LOW to the upper limit value PR _UPP is the peak detection range. Of the peaks appearing in the acceleration waveform indicated by the acceleration data AS, only the peak having the magnitude of acceleration within the peak detection range is taken as the peak when the player swings the performance operator 10 with the intention to beat. handle. The lower limit value PR _LOW and the upper limit value PR _UPP of the peak detection range are obtained as follows. First, various people are beaten by the performance operator 10 with various strengths, and the acceleration when the performance operator 10 is swung off at each beat is measured. A value slightly smaller than the minimum value of acceleration collected by the measurement is set as the lower limit value PR _LOW of the peak detection range, and a value slightly larger than the maximum value of acceleration is set as the upper limit value _PRUPP . By setting the lower limit value PR _LOW and the upper limit value PR _UPP obtained in this way, it becomes possible to extract various people's intention to beat various strengths.

The performance controller 27 changes the magnitude of the acceleration indicated by the acceleration data AS within the peak acceleration range delivered from the peak detector 26 from “30” which is the minimum value VL _MIN to “127” which is the maximum value VL _MAX. The performance data describing the velocity of the mapping destination is output from the I / F 28 to the MIDI sound source 40, and the volume level corresponding to the velocity is output. The sound of
The mapping from the magnitude of acceleration indicated by the acceleration data AS to the velocity is performed according to a mapping rule that maps the acceleration within the peak detection range to the velocity range. More specifically, the performance control unit 27 inputs the acceleration data AS into the following equation (2), and uses VL obtained by this input as the mapping destination velocity.
VL = (AS−PR _LOW ) / (PR _UPP −PR _LOW ) × (VL _MAX −VL _MIN ) + VL _MIN (2)

According to the performance control device 20 described above, it is possible to bring the intensity of the musical sound that the performer produces from the MIDI sound source 40 in accordance with the behavior of the performance operator 10 closer to the feeling that the performer shakes the performance operator 10.
This action will be specifically described with reference to FIG. The peak detection unit 26 of the performance control device 20 calculates a peak P having an acceleration magnitude that is larger than the lower limit value PR _LOW of the peak detection range and smaller than the upper limit value PR _UPP from the acceleration waveform indicated by the acceleration data AS. Then, the acceleration data AS of the peak P is delivered to the performance control unit 27. Then, the performance control unit 27 maps the acceleration data AS delivered from the peak detection unit 26 to the velocity range according to the above mapping rule, and outputs performance data describing the velocity of the mapping destination to the MIDI sound source 40. Here, when mapping is performed according to the above mapping rule, the acceleration data AS in the peak detection range and the velocity in the velocity range correspond linearly as shown in FIG. Therefore, the strength close to the sensation of the force of shaking the performance operator 10 without giving the player the impression that the volume does not change as expected even though the force of shaking the performance operator 10 is increased or decreased. The sound of can be pronounced.

Although one embodiment of the present invention has been described above, the present invention may have other embodiments. For example, it is as follows.
(1) In the above embodiment, the performance control device 20 performs the mapping from the acceleration data AS to the velocity range according to the above equation (2). However, this may be done according to another mapping rule. For example, VL obtained by inputting acceleration data AS into the following equation (3) may be used as the velocity of the mapping destination. In this mapping rule, the performance control unit 27 inputs the acceleration data AS into the following equation (3), and compares VL obtained by this input with “127” which is the maximum value VL _MAX of the velocity range. If VL is “127” or less, the VL is the velocity of the mapping destination, and if VL is larger than “127”, “127” is the velocity of the mapping destination.
_{VL = (AS-PR LOW)} / (PR UPP -PR LOW) × VL MAX + VL MIN ... (3)
(2) In the above embodiment, the minimum value VL _MIN of the velocity range is “30”, and the maximum value VL _MAX thereof is “127”. However, the minimum value VL _MIN and the maximum value VL _MAX may each be larger or smaller.
(3) In the above embodiment, the player may be able to set the minimum value VL _MIN and the maximum value VL _MAX of the velocity range through the operation of the operation display unit 21.
(4) The performance control system according to the above embodiment may be applied to an application as an exercise support system that expresses the intensity of exercise as a volume. In this aspect, the athlete who performs the exercise holds the performance operator 10 and performs exercises such as dance and aerobics. Then, the performance control device 20 causes the MIDI sound source 40 to generate a musical sound having a strength corresponding to the strength of the performance operator 10 every time the performance operator 10 is swung through the athlete's movement. According to this aspect, the athlete can grasp his / her own body cut by relying on the volume of the musical sound generated from the MIDI sound source 40 during exercise.
(5) In the above embodiment, a sensor other than the acceleration sensor 11 such as a magnetic sensor, a gyro sensor, a pressure sensor, and a tilt sensor is built in the performance operator 10, and peak detection is performed from the waveform of the physical quantity detected by the sensor. Peaks within the range may be detected.
(6) A control program for realizing the same functions as those of the acceleration acquisition unit 25, the peak detection unit 26, and the performance control unit 27 of the performance control device 20 in the above embodiment is installed in a computer, and the computer is used as the performance control device 20. It may be operated. In this case, for example, a control program may be installed in a mobile phone incorporating an acceleration sensor and a sound source so that the casing of the mobile phone itself functions as the performance operator 10. In this embodiment, the control program causes the CPU of the mobile phone to realize the acceleration acquisition unit 25, the peak detection unit 26, and the performance control unit 27. When the performer grips and shakes the case of the mobile phone, the acceleration indicating the behavior of the case is detected by the built-in acceleration sensor, and the peak with the magnitude of the acceleration within the peak detection range is the waveform of the acceleration. Performance data including the velocity mapping the acceleration is output to the sound source.

1 is an overall configuration diagram of a performance control system including a performance control device according to an embodiment of the present invention. It is a figure which shows the mode of the mapping from the acceleration data to the velocity range by the performance control apparatus of the performance control system of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Performance operator, 11 ... Acceleration sensor, 12, 22 ... Wireless communication part, 21 ... Operation display part, 20 ... Performance control apparatus, 23 ... Control part, 25 ... Acceleration acquisition part, 26 ... Peak detection part, 27 ... Performance controller, 28 ... interface, 40 ... MIDI sound source.

Claims (6)

Peak detecting means for detecting a peak having a physical quantity within a peak detection range of a predetermined width from a physical quantity waveform indicating the behavior of the performance operator;
In accordance with a mapping rule for mapping a physical quantity in the peak detection range to a velocity range of a predetermined width, performance control for mapping the magnitude of the physical quantity at the peak detected by the peak detection means to velocity and outputting performance data including the velocity And a performance control device. The performance control means includes
The lower limit value of the peak detection range is PR _LOW , the upper limit value of the peak detection range is PR _UPP , the minimum value of the velocity range is VL _MIN , the maximum value of the velocity range is VL _MAX , and the peak detected by the peak detection means The velocity VL is calculated according to the following formula (1), and the velocity to be included in the performance data is specified based on the calculated velocity VL when the physical quantity size in AS is AS. The performance control apparatus as described.
_{VL = (AS-PR LOW)} / (PR UPP -PR LOW) × (VL MAX -VL MIN) + VL MIN ... (1) The performance control means includes
The lower limit value of the peak detection range is PR _LOW , the upper limit value of the peak detection range is PR _UPP , the minimum value of the velocity range is VL _MIN , the maximum value of the velocity range is VL _MAX , and the peak detected by the peak detection means The velocity VL is calculated according to the following formula (2), and the velocity to be included in the performance data is specified based on the calculated velocity VL, where AS is the physical quantity size in The performance control apparatus as described.
VL = (AS−PR _LOW ) / (PR _UPP −PR _LOW ) × VL _MAX + VL _MIN (2) A sensor for detecting a physical quantity indicating the behavior of the performance operator;
4. A performance operator comprising: a communication unit configured to transmit a signal indicating a physical quantity detected by the sensor to the performance control device according to claim 1. On the computer,
Peak detection means for detecting a peak having a magnitude of acceleration within a peak detection range of a predetermined width, from a physical quantity waveform indicating the behavior of the performance operator;
According to a mapping rule for mapping acceleration within the peak detection range to a velocity range of a predetermined width, performance control for mapping the magnitude of acceleration at the peak detected by the peak detection means to velocity and outputting performance data including the velocity A program that realizes the means. A performance operator comprising a sensor for detecting a physical quantity indicating the behavior of the performance operator and a communication means for transmitting a signal indicating the physical quantity detected by the sensor;
Peak detecting means for detecting a peak having a physical quantity within a peak detection range of a predetermined width from the waveform of the physical quantity indicated by the signal transmitted by the communication means, and a physical quantity within the peak detection range having a predetermined width A performance control device having performance control means for mapping the physical quantity at the peak detected by the peak detection means to velocity and outputting performance data including the velocity in accordance with a mapping rule for mapping to a velocity range of A performance control system characterized by that.

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