JP2009031361A - Electronic music instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic music instrument capable of optionally varying a musical scale, volume, and frequency characteristics as three factors of sound by using an infrared sensor. <P>SOLUTION: A signal of an infrared sensor part 1 is amplified by an amplifying circuit part 2, and analog data are converted into digital data X, Y, and Z by an A/D converting circuit part 3. Based on the digital data X, Y, and Z, the electronic music instrument 100 varies the musical scale, volume, and frequency characteristics of the sound by means of a musical scale variation part 4, a volume variation part 5, and a frequency characteristic variation part 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic musical instrument, and more particularly to an electronic musical instrument having a function of arbitrarily changing three elements of sound, that is, scale, volume, and frequency characteristics.

  2. Description of the Related Art Conventionally, in the field of games and the like, an electronic musical instrument that can detect a user's action by some means and play it in a predetermined format based on the detection result is known. As a means for detecting the user's operation, for example, an electronic musical instrument combining an LED and a camera as in Patent Document 1 and an electronic musical instrument using an infrared sensor as in Patent Document 2 have been proposed.

  In Patent Document 1, in order to enable a plurality of musical instruments to be played while saving space, and to enable a performance with a realistic playing method, infrared light is steadily applied to the back side of the translucent surface. Infrared LED panel, CCD camera that picks up only the infrared light incident from the semi-transparent surface, and projector that projects and displays images (not including infrared light) on the semi-transparent surface Is.

  Patent Document 2 relates to an electronic musical instrument that can perform a variety of automatic performances by a simple operation. The operation panel includes a beam controller including an infrared light emitting diode and an infrared sensor. Is provided.

JP-A-11-38967 JP 2005-164857 A

  However, the electronic musical instrument described in Patent Document 1 has a problem that it is inevitably expensive because it requires a camera in addition to the LED as an essential requirement of the system. In addition, there is a problem that very complicated signal processing is required to detect a user's action by the camera. Therefore, as a result, the system becomes very large.

  Further, the electronic musical instrument described in Patent Document 2 requires an infrared light emitting diode together with an infrared sensor, and there is a problem that it is expensive as in Patent Document 1 described above. In addition, the output of the infrared sensor is reflected only in the performance timing of the electronic musical instrument, and is not suitable for devices such as games.

  Generally speaking, in the field of musical instrument performance or game, the above-mentioned Patent Documents 1 and 2 are generally performed using an infrared sensor called a “passive type” that can detect infrared radiation of a human body (user). There is a demand for an electronic musical instrument that can change musical elements other than timing, for example, a scale, volume, and frequency characteristics, generally referred to as three elements of sound, in accordance with the output of an infrared sensor.

  The present invention has been made in view of such problems, and its purpose is to arbitrarily change the scale, volume, and frequency characteristics, which are the three elements of sound, based on the output of a passive infrared sensor. It is providing the electronic musical instrument which has.

  The present invention has been made to achieve such an object, and the invention according to claim 1 is an electronic musical instrument having a function capable of arbitrarily changing the scale, volume, and frequency characteristics of a sound. At least one infrared sensor, amplification means for amplifying an output signal of the infrared sensor, and A / D conversion means for converting analog data obtained by the amplification means into digital data, the A / D conversion It has a function capable of arbitrarily changing at least one of the scale, volume and frequency characteristics of the sound based on the digital data obtained by the means. (Corresponding to Fig. 1)

  The invention according to claim 2 is the invention according to claim 1, wherein a scale change means for changing the scale, a volume change means for changing the volume, and a volume change means, are provided after the A / D conversion means. Frequency characteristic changing means for changing the frequency characteristic is provided. (Corresponding to Fig. 1)

  According to a third aspect of the present invention, in the second aspect of the present invention, the two infrared sensors are provided, and the A / D conversion unit converts each of the two analog data obtained by the amplification unit. Converting into two digital data, based on one of the two digital data, at least one of the scale characteristics by the scale changing means or the frequency characteristics changing by the frequency characteristic changing means It has a function that the volume can be arbitrarily changed by the volume changing means based on the other digital data of the two digital data. (Corresponding to Fig. 3)

  According to a fourth aspect of the present invention, there is provided an electronic musical instrument having a function capable of arbitrarily changing the scale, volume, and frequency characteristics of a sound, and amplifying two or more infrared sensors and an output signal of the infrared sensor. Amplifying means, two or more analog data obtained by the amplifying means, A / D converting means for converting each of them into two or more digital data, and two or more obtained by the A / D converting means Two or more volume changing means for changing the volume based on digital data, and an assigning means for assigning an arbitrary scale to two or more digital data obtained by the A / D conversion means. The volume of two or more musical scales assigned by the assigning means is arbitrarily changed based on the digital data of the infrared sensor by the volume changing means. It characterized by having a function capable. (Corresponding to Fig. 5)

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the maximum value or the minimum value of the digital data of the infrared sensor is assigned to the maximum value or the minimum value by the assigning means. Discriminating means for discriminating the scale, and the volume of the scale assigned to the maximum value or the minimum value by the assigning means is calculated based on the digital data of the infrared sensor of the maximum value or the minimum value by the volume changing means. It is characterized by being arbitrarily changed. (Corresponding to Fig. 5)

  According to the present invention, by using a “passive type” infrared sensor that does not have to have a light emitting unit, it is possible to detect a movement of a human body (user), thereby arbitrarily including three pitches, volume, and frequency. It is possible to easily realize an electronic musical instrument whose characteristics can be changed.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram for explaining a first embodiment of an electronic musical instrument according to the present invention. An electronic musical instrument 100 according to the present invention includes an infrared sensor 1, an amplification circuit unit 2, an A / D conversion circuit unit 3, a scale changing unit 4, a volume changing unit 5, and a frequency characteristic changing unit 6.

  The infrared sensor 1 is of a passive type that can be detected without having a light emitting unit. As the detection principle of the passive infrared sensor, pyroelectric type, quantum type and the like currently exist, but in the present invention, it does not particularly depend on the detection principle.

  The amplification circuit unit 2 amplifies the signal output of the infrared sensor unit 1. Since the normal infrared sensor 1 has a small signal, it is generally amplified electrically using an electronic component such as an operational amplifier (Operational Amplifier).

  The A / D (Analog to Digital) conversion circuit unit 3 converts the analog signal (data) amplified by the infrared sensor unit 1 into a digital signal (data). In the A / D conversion circuit unit 3, the digital data to be converted and output is normally converted into a numerical value that matches the input specifications of the next stage. If A / D conversion is not required, the A / D conversion circuit 3 can be omitted as appropriate.

  The scale changing unit 4 can change the scale of the generated sound based on the digital data X from the A / D conversion circuit unit 3, and the volume changing unit 5 is the A / D conversion circuit unit 3. The frequency characteristic changing unit 6 can change the sound generated based on the digital data Z from the A / D conversion circuit unit 3. It is possible to change the frequency characteristics.

  The electronic musical instrument 100 has a function capable of arbitrarily changing at least one of the scale changing unit 4, the volume changing unit 5, and the frequency characteristic changing unit 6. In general, the input specifications of the electronic musical instrument 100 differ depending on each electronic musical instrument. However, in the present invention, as described above, three types of digital data X, Y, and Z exist independently. When X is changed, the scale of the sound is changed, when Y is changed, the volume of the sound is changed, and when Z is changed, the frequency characteristic of the sound is changed.

  FIG. 2 is a flowchart for explaining the operation in the first embodiment shown in FIG. This flow chart is for the case where the frequency characteristic of sound is changed for one infrared sensor 1, but when there are two or more infrared sensors, or the scale and volume are changed in addition to the frequency characteristic. The same configuration as that described below can be applied to the case of making them. This will be described later.

  First, it waits until the measurement timing for acquiring digital data Z for changing the frequency characteristic (step S1). In this measurement timing, a user generally sets a data acquisition cycle or frequency, but the measurement timing is not particularly limited to this method.

  When the measurement timing is reached, the electronic musical instrument 100 acquires the output of the infrared sensor 1 as digital data Z (step S2). In the present embodiment, the acquired digital data Z takes values from 0 to 20000 by processing up to the A / D conversion circuit unit 3.

  Subsequently, in step S3, a sound having a frequency indicated by the digital data Z is reproduced (played) at a predetermined volume. For example, when Z = 1000, a 1 kHz sine wave may be reproduced, or a synthesized sound having a frequency based on 1 kHz may be used.

  When step 3 is completed, the process waits until the measurement timing for acquiring the digital data Z again. Hereinafter, it is possible to realize an electronic musical instrument that can arbitrarily change the frequency characteristics by repeating the above steps. Note that. Similarly, the scale and pitch can be realized based on the digital data X and Y.

  Next, a second embodiment of the present invention will be described below with respect to an electronic musical instrument that can change the scale and volume of two infrared sensors.

  FIG. 3 is a block diagram for explaining a second embodiment of the electronic musical instrument according to the present invention. In the second embodiment, the two infrared sensors 1-1 and 1-2 are referred to as an infrared sensor A and an infrared sensor B. The outputs of the two infrared sensors A and B are amplified by the amplification circuit unit 2, and analog data is converted into digital data X and Y by the A / D conversion circuit unit 3. An electronic musical instrument 100 in which the scale changing unit 4 can change the frequency characteristic with the scale changing unit 4 based on one digital data X, and the volume changing unit 5 can change the volume based on the other digital data Y. Is feasible.

  FIG. 4 is a flowchart for explaining the operation in the second embodiment shown in FIG. First, similarly to the flowchart shown in FIG. 2, the process waits until the measurement timing (step S1). At the measurement timing, the output of the infrared sensor A is converted to digital data X in step S2, and then the output of the infrared sensor B is converted to digital data Y in step S3. The scale or frequency characteristic is changed based on the digital data X, and the volume is changed based on the digital data Y (step S4).

  In the above description, the amplification circuit unit 2 and the A / D conversion circuit unit 3 are one system, and the method of processing the infrared sensor A and the infrared sensor B in a time division manner has been described. However, the method is not particularly limited to this method. Alternatively, for example, two amplifier circuit units 2 and two A / D conversion circuit units 3 may be provided and arranged in parallel and processed simultaneously.

Next, a third embodiment of the present invention will be described below with respect to an electronic musical instrument that can change the scale and volume of four infrared sensors.
FIG. 5 is a block diagram for explaining a third embodiment of the electronic musical instrument in the present invention. In the third embodiment, the four infrared sensors 1-1, 1-2, 1-3, and 1-4 are referred to as an infrared sensor A, an infrared sensor B, an infrared sensor C, and an infrared sensor D. Further, the four volume changing sections 5-1, 5-2, 5-3, and 5-4 are referred to as volume changing sections A, B, C, and D.

  The outputs of the four infrared sensors A, B, C, and D are amplified by the amplification circuit unit 2, and the analog data is converted into digital data Y1, Y2, Y3, and Y4 by the A / D conversion circuit unit 3. That is, the digital data obtained by converting the output of the infrared sensor A is Y1, the digital data obtained by converting the output of the infrared sensor B is Y2, the digital data obtained by converting the output of the infrared sensor C is Y3, and the output of the infrared sensor A is converted. The obtained digital data is set as Y4. The volume of the converted digital data Y1, Y2, Y3, Y4 is changed by the volume changing sections A, B, C, D, respectively.

  At this time, unlike the case of the second embodiment described above, the scale changing unit 4 ′ (corresponding to the assigning means) causes the infrared sensor A to have, for example, the pitch name “do” and the infrared sensor B to The pitch name “Mi” is assigned to the infrared sensor A, for example, and the pitch name “S” is assigned to the infrared sensor D, for example.

  Further, the maximum value or the minimum value of the digital data of the infrared sensors A, B, C, D is assigned to the maximum value or the minimum value by the arithmetic unit (not shown) and the scale changing unit 4 ′ (assignment means). A discriminating unit (not shown) for discriminating the scale, and the volume of the scale assigned to the maximum value or the minimum value by the scale changing unit 4 ′ is set to the maximum value or by the volume changing units A, B, C, D. It can be arbitrarily changed based on the digital data of the minimum value of the infrared sensors A, B, C, and D.

  FIG. 6 is a flowchart for explaining the operation of the third embodiment in the block diagram shown in FIG. In contrast to the above-described setting, in the case of the third embodiment, as shown in the flowchart of FIG. 6, the pitch name “do” is the volume of Y1, the pitch name “mi” is the volume of Y2, and the pitch name “ “So” is played at the volume of Y3, and the pitch name “Sh” is played at the volume of Y4. If all the sounds are reproduced at a volume sufficiently high for the user, the electronic musical instrument 100 will generally play Cmaj7 (Sea Major Seven), which is a chord.

  That is, first, similarly to the flowchart shown in FIG. 4, the process waits until the measurement timing (step S1). At the measurement timing, the output of the infrared sensor A is converted into digital data Y1 in step S2, the output of the infrared sensor B is then converted into digital data Y2 in step S3, and then the infrared sensor C is converted in step S4. Is converted into digital data Y3, and then in step S5, the output of the infrared sensor D is converted into digital data Y4. Plays the pitch name “Do” with the volume data Y1, plays the pitch name “Mi” with the volume data Y2, plays the pitch name “So” with the volume data Y3, and plays the pitch name “S” with the volume data Y4. (Step S6).

  Finally, in the case of the fourth embodiment of the present invention, an electronic musical instrument that can change the volume only for the scale that takes the maximum or minimum value for the four infrared sensors will be described below. The block diagram is exactly the same as FIG.

  As described above, the scale changing unit 4 ′ causes the infrared sensor A to have, for example, the pitch name “DO”, the infrared sensor B, for example, the pitch name “MI”, and the infrared sensor A, for example, The pitch name “seo” is assigned to the infrared sensor A, for example, the pitch name “si” is assigned, and the digital data obtained by converting the output of the infrared sensor A is converted to Y1 and the output of the infrared sensor B is converted. The digital data is Y2, the digital data obtained by converting the output of the infrared sensor C is Y3, and the digital data obtained by converting the output of the infrared sensor A is Y4.

  FIG. 7 is a diagram showing a flowchart for explaining the operation of the fourth embodiment in the block diagram shown in FIG. In contrast to the setting described above, in the case of the fourth embodiment, first, the maximum values of the digital data Y1 to Y4 from the infrared sensors A to D are searched as shown in the flowchart of FIG. If Y1 has the maximum value, the pitch name “do” is reproduced at the volume of Y1. Similarly, for other settings, only the scale assigned to the maximum value of the digital data is reproduced at the maximum volume. If all the sounds are reproduced at a volume sufficiently high for the user, the electronic musical instrument 100 can realize an instrument that plays only one sound, that is, a melody, unlike the above.

  That is, first, similarly to the flowchart shown in FIG. At the measurement timing, the output of the infrared sensor A is converted to digital data Y1 in step S2, then the output of the infrared sensor B is converted to digital data Y2 in step S3, and then the infrared sensor C is converted in step S4. Is converted into digital data Y3. Next, in step S5, the output of the infrared sensor D is converted into digital data Y4. Next, in step S6, the maximum value of the digital data Y1 to Y4 from the infrared sensors A to D is searched. Next, only the pitch name “do” is reproduced with the volume data Y1 (step S7-1), only the pitch name “mi” is reproduced with the volume data Y2 (step S7-2), and only the pitch name “seo” is reproduced. Reproduction is performed with the volume data Y3 (step S7-3), and only the pitch name “si” is reproduced with the volume data Y4 (step S7-4).

  In the case of the third embodiment and the fourth embodiment described above, four infrared sensors have been described, but this number is not limited to four and can be arbitrarily set. It is.

It is a block diagram for demonstrating the 1st Example of the electronic musical instrument in this invention. It is a figure shown in the flowchart for demonstrating the operation | movement in 1st Example shown in FIG. It is a block diagram for demonstrating 2nd Example of the electronic musical instrument in this invention. It is a figure shown in the flowchart for demonstrating the operation | movement in 2nd Example shown in FIG. It is a block diagram for demonstrating the 3rd Example of the electronic musical instrument in this invention. It is a figure shown in the flowchart for demonstrating operation | movement of 3rd Example in the block diagram shown in FIG. It is a figure shown in the flowchart for demonstrating operation | movement of 4th Example in the block diagram shown in FIG.

Explanation of symbols

1 Infrared sensor part 1-1 Infrared sensor A
1-2 Infrared sensor B
1-3 Infrared sensor C
1-4 Infrared sensor D
2 Amplifying circuit section 3 A / D conversion circuit section 4 Scale changing section 4 'Scale changing section (assignment means)
5 Volume change part 5-1 Volume change part A
5-2 Volume change part B
5-3 Volume change section C
5-4 Volume change part D
6 Frequency characteristic changing unit 100 Electronic musical instrument

Claims (5)

In an electronic musical instrument having a function that can arbitrarily change the scale, volume, and frequency characteristics of a sound,
At least one infrared sensor;
Amplifying means for amplifying the output signal of the infrared sensor;
A / D conversion means for converting analog data obtained by the amplification means into digital data,
An electronic musical instrument having a function capable of arbitrarily changing at least one of the scale, volume, and frequency characteristics of the sound based on digital data obtained by the A / D conversion means.   A scale changing means for changing the scale, a volume changing means for changing the volume, and a frequency characteristic changing means for changing the frequency characteristic are provided downstream of the A / D conversion means. Item 2. The electronic musical instrument according to Item 1. Two infrared sensors are provided,
The A / D conversion means converts the two analog data obtained by the amplification means into two digital data respectively;
Based on one digital data of the two digital data, at least one of the frequency characteristics can be arbitrarily changed by the scale changing means by the scale changing means or the frequency characteristic changing means, and the two digital data can be changed. 3. The electronic musical instrument according to claim 2, wherein the electronic musical instrument has a function capable of arbitrarily changing a volume by the volume changing unit based on the other digital data. In an electronic musical instrument having a function that can arbitrarily change the scale, volume, and frequency characteristics of a sound,
Two or more infrared sensors;
Amplifying means for amplifying the output signal of the infrared sensor;
A / D conversion means for converting two or more analog data obtained by the amplification means into two or more digital data respectively;
Two or more volume changing means for changing the volume based on two or more digital data obtained by the A / D conversion means;
Assigning means for assigning an arbitrary scale to two or more digital data obtained by the A / D conversion means,
An electronic musical instrument having a function capable of arbitrarily changing the volume of two or more musical scales assigned by the assigning means based on digital data of the infrared sensor by the volume changing means. Computation means for obtaining the maximum value or minimum value of the digital data of the infrared sensor, and determination means for determining the scale assigned to the maximum value or the minimum value by the assignment means,
The sound volume of the scale assigned to the maximum value or the minimum value by the assigning means is arbitrarily changed by the sound volume changing means based on the digital data of the infrared sensor of the maximum value or the minimum value. 4. The electronic musical instrument according to 4.

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