JP2010085680A - Simple tuning determination system of musical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple tuning determination system of a musical instrument, which is capable of easily and properly determining the necessity for tuning of the musical instrument. <P>SOLUTION: The system includes: a terminal device 3 which has a microphone 6 for taking in sound of a musical instrument 2 and has a communication means 7 for transmitting the taken-in sound of the musical instrument 2; and a tuning determination device 5 which determines whether tuning of the musical instrument 2 is good or not on the basis of the sound of the musical instrument 2 transmitted from the terminal device 3. The tuning determination device 5 includes: a reception means 15 for receiving the sound of the musical instrument 2; a determination means 11 for determining whether tuning of the musical instrument 2 is good or not on the basis of the received sound of the musical instrument 2; and a transmission means 15 for transmitting information showing the determination result of the determination means 11 to the terminal device 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a musical instrument simple tuning determination system for easily determining the quality of musical instrument tuning.

  As a conventional tuning device used when tuning a musical instrument, for example, the one disclosed in Patent Document 1 is known. This tuner is incorporated in a wristwatch, and is obtained by a microphone that captures the sound of an instrument, a frequency counter that calculates the frequency of the captured instrument sound, a ROM that stores the frequency of the reference sound of the instrument, and a frequency counter. A comparator that calculates the difference between the frequency of the sound and the frequency of the reference sound, and a piezoelectric element that converts the calculated frequency difference into vibration intensity. Therefore, the wristwatch wearer can know that the sound of the musical instrument is deviated by sensing this vibration.

  However, especially when the musical instrument is a piano, special techniques are required for the tuning, so it is not possible to perform tuning on its own, and an expert is requested to tune. On the other hand, the above-mentioned conventional tuning device can know the fact that the sound of the instrument is shifted, but cannot know the degree of the shift, so it appropriately determines the necessity of requesting tuning. Can not.

  The present invention has been made to solve such a problem, and an object thereof is to provide a simple tuning determination system for a musical instrument that can easily and appropriately determine the necessity of tuning a musical instrument. To do.

JP 2007-101803 A

  In order to achieve this object, the invention according to claim 1 is a simple tuning determination system for a musical instrument for simply determining the quality of a musical instrument tuning, and has a microphone that captures the sound of the musical instrument. A terminal device having communication means for transmitting the sound of the musical instrument, and a tuning determination device that determines the quality of the musical instrument tuning based on the sound of the musical instrument transmitted from the terminal device. Receiving means for receiving the sound, determining means for determining the quality of the musical instrument tuning based on the received sound data of the instrument, transmitting means for transmitting information representing a determination result by the determining means to the terminal device, It is characterized by having.

  According to this configuration, when the sound of the musical instrument is captured from the microphone to the terminal device, the captured musical instrument sound is transmitted to the rhythm determination device. The tune determination device receives the sound of the instrument, determines the quality of the tune based on the received sound data of the instrument, and transmits information representing the determination result to the terminal device. Thereby, the necessity for tuning of the musical instrument can be easily and appropriately determined based on the information indicating the determination result transmitted to the terminal device.

  According to a second aspect of the present invention, in the simple tuning determination system for a musical instrument according to the first aspect, the tuning determination device further includes frequency analysis means for obtaining the frequency of the sound by analyzing the data of the received musical instrument sound. And the determining means determines the octave accuracy based on the ratio of the frequencies of two sounds that are octave apart from each other, which is obtained by the frequency analyzing means.

  According to this configuration, the sound frequency of the received musical instrument is analyzed to obtain the sound frequency, and the octave accuracy is determined based on the obtained ratio of the two sound frequencies that are octave apart from each other. Therefore, it is possible to easily and appropriately determine the quality of the musical instrument based on the determined octave accuracy.

  According to a third aspect of the present invention, in the simplified tuning determination system for musical instruments according to the first aspect, the tuning determination device further includes frequency analysis means for obtaining the frequency of the sound by analyzing the data of the received musical instrument sound. And the determining means determines unison accuracy based on the number of frequencies of one sound obtained by the frequency analyzing means.

  According to this configuration, by analyzing the received sound data of the musical instrument, the sound frequency is obtained, and the unison accuracy is determined based on the obtained number of frequencies of one sound. Here, unison accuracy refers to the degree of coincidence of sound pitch between strings when a plurality of strings are provided for one sound. When this unison accuracy is out of order, sound is distorted. Therefore, it is possible to easily and appropriately determine the quality of the musical instrument based on the determined unison accuracy.

  According to a fourth aspect of the present invention, in the simple tuning determination system for musical instruments according to any one of the first to third aspects, the terminal device is a mobile phone.

  According to this configuration, it is possible to capture and transmit the sound of a musical instrument and receive a determination result using a mobile phone, so that the usability of the simple tuning determination system can be improved.

   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The simple tuning determination system 1 of the piano 2 according to the present invention is for the owner of the piano 2 to obtain a determination as to the necessity of requesting tuning of the piano 2 from a business operator.

  As shown in FIG. 1, this simple tuning determination system 1 includes a mobile phone 3 as a terminal device that captures the sound of a piano 2 and a tuning determination device on the operator side connected to the mobile phone 3 via a communication line 4. And 5.

  The mobile phone 3 includes a microphone 6 for capturing the sound of the piano 2, a communication device 7 for transmitting the sound of the piano 2 and receiving information such as a determination result from the rhythm determination device 5, and the received information. Has a display screen 8 or the like.

  The communication line 4 only needs to be capable of transmitting and receiving voice and image data, and includes, for example, a public telephone line and the Internet. Public telephone lines include ISDN lines and IP telephone lines in addition to analog lines.

  As shown in FIG. 2, the tuning determination device 5 includes a ROM 9, a RAM 10, a CPU 11, a frequency analysis unit 12, an input / output interface (I / F) 13, and the like, which are connected via a bus 14. The ROM 9 stores reference sound data, owner data, message data, and the like in addition to programs executed by the CPU 11.

  The reference sound data includes sound data representing the pitch name and pitch corresponding to each key of the piano, and the frequency (for example, fc1 = 32.7 Hz, fc2 = 65.) Of the tuned reference sound (for example, C1 to C8). 4 Hz... Fc8 = 4186.0 Hz).

  The owner data includes information data such as an ID number for specifying the purchaser of the piano 2 and the date of manufacture and serial number of the piano 2. As will be described later, the message data is composed of message information (for example, “Tuning is required”) to inform the owner of the necessity of tuning when the quality of the tuning of the piano 2 is determined. Yes.

  A communication device 15 such as a modem, a display device 16 such as a display, and an input device 17 such as a keyboard and a mouse are connected to the input / output interface (I / F) 13. The communication device 15 receives a plurality of piano 2 sounds (hereinafter referred to as “input sounds”) captured by the mobile phone 3.

  The RAM 10 temporarily stores calculation results obtained by the CPU 11 and is also used as a work area for the CPU 11.

  Under the control of the CPU 11, the frequency analysis unit 12 performs Fourier analysis on the signal representing the input sound to detect a spectrum corresponding to a plurality of frequencies set for each pitch name, and from the peak of the detected spectrum, Find one or more frequencies of the input sound.

  The CPU 11 uses the frequency obtained by the frequency analysis unit 12 and executes octave accuracy determination processing and unison accuracy determination processing in accordance with a program stored in the ROM 9. Here, octave accuracy refers to the degree of correctness of pitch between two input sounds that are separated from each other by an octave. The unison accuracy refers to the degree of coincidence of the pitches generated by these strings when a plurality of strings are provided for one sound in the middle and high pitch range of the piano. In the present embodiment, the CPU 11 corresponds to a determination unit.

  FIG. 3 is a flowchart showing the octave accuracy determination process described above. Prior to this determination processing, an instruction is sent from the tuning determination device 5 to the owner's mobile phone 3 to sequentially generate, for example, C-series sounds (C1 to C8). The sound of the piano 2 generated in response thereto is transmitted to the rhythm determination device 5 via the mobile phone 3 and the communication line 4. The transmitted input sound is analyzed by the frequency analysis unit 12, thereby obtaining the frequency of the input sound.

  In the determination process of FIG. 3, first, in step 1 (shown as “S1”, the same applies hereinafter), the frequency of the input sound obtained by the frequency analysis unit 12 is acquired. Next, it is determined whether or not the frequency of the acquired input sound is substantially equal to the frequency of the reference sound (step 2). If this determination result is NO and the frequency of the input sound is different from the frequency of the reference sound, it is determined that the C-sequence sound according to the operator's instruction has not been transmitted, and an instruction requesting re-input of the correct sound is given to the mobile phone 3 (step 3).

  When the determination result in step 2 is YES, frequency ratios cf2 / cf1, cf3 / cf2,... Cf8 / cf7 between two C sounds separated by one octave are calculated (step 4). Next, it is determined whether or not all the calculated frequency ratios are substantially equal to 2 (step 5). When the determination result is NO, since octave accuracy is not obtained, it is determined that tuning is necessary (step 6), and a message representing the determination result is transmitted to the mobile phone 3 (step 8). On the other hand, when the determination result in step 5 is YES, since octave accuracy is obtained, it is determined that tuning is not necessary (step 7), and a message representing the determination result is transmitted (step 8).

  FIG. 4 is a flowchart showing the unison accuracy determination process executed by the CPU 11. Prior to this processing, the rhythm determination device 5 causes the mobile phone 3 to sequentially generate typical sounds in the middle and high range where a plurality of strings are provided for one sound, for example, C sound and G sound. Instructions are sent to The sound of the piano 2 generated in response thereto is analyzed by the frequency analysis unit 12, thereby obtaining the frequency of the input sound.

  In the determination process of FIG. 4, first, in step 11, the frequency of the input sound obtained by the frequency analysis unit 12 is acquired. Next, it is determined whether or not the acquired frequency is 1 for all input sounds (step 12). When the determination result is YES, unison accuracy is obtained for all input sounds, so it is determined that tuning is not necessary (step 17), and a message representing the determination result is transmitted (step 16). When the determination result of step 12 is NO and a plurality of frequencies are obtained for at least one input sound, a difference Δf between the plurality of frequencies of the input sound is calculated (step 13).

  Next, it is determined whether or not the absolute value | Δf | of the calculated frequency difference Δf is smaller than a predetermined determination value (step 14). If the determination result is YES, it is determined that tuning is not necessary because the unison accuracy has shifted, but it is within the allowable range (step 17), and a message representing the determination result is transmitted (step 16). . On the other hand, when the determination result is NO, it is determined that tuning is necessary because the deviation in unison accuracy exceeds the allowable range (step 15), and a message representing the determination result is transmitted (step 16).

  As described above, according to the present embodiment, the tuning determination device 5 receives the sound of the piano 2 and analyzes the received sound (input sound) by the frequency analysis unit 12 to acquire the frequency. Further, a frequency ratio between two sounds separated by one octave is obtained based on the acquired frequency, octave accuracy is determined based on the frequency ratio, and the determination result is transmitted to the mobile phone 3. Further, when a plurality of frequencies are obtained for one input sound, it is determined that the unison accuracy is shifted, and the determination result is transmitted to the mobile phone 3.

  Therefore, the owner of the piano 2 can easily and appropriately know the necessity of tuning of the piano 2 based on the transmitted octave accuracy and unison accuracy determination results.

  In addition, the business operator stores information regarding the customer's piano 2 by storing the determination result of the tuning quality of the piano 2 obtained as described above for each owner identification data and the serial number of the piano 2. It can also be accumulated and used for its management.

  In addition, this invention can be implemented in various aspects, without being limited to embodiment described. For example, in the embodiment, the piano 2 is shown as a musical instrument, but the present invention is not limited to the piano 2 and may be applied to a musical instrument such as a harpsichord that requires tuning. In addition, octave accuracy and unison accuracy are used as parameters indicating the quality of tuning, but other parameters may be used. For example, by directly comparing the frequency of the input sound with the frequency of the reference sound, The quality of the tuning may be determined. In this case, the frequency may be not only an equal temperament but also a classical rhythm, or may be based on a rhythm curve peculiar to a piano (for example, a tune based on an equal temperament, with low tones being high and high tones being high).

  Furthermore, the C-series sound is generated when the octave accuracy is determined, and the C sound and G sound are generated when the unison accuracy is determined. It may be determined whether or not the tuning of the instrument is good. Further, although the octave accuracy and unison accuracy are determined based on the frequency obtained by Fourier analysis of the input sound, other appropriate determination methods may be used.

  Furthermore, in the embodiment, the mobile phone 3 is used as the terminal device. However, any other terminal device such as a personal computer or a fixed device can be used as long as it can capture and transmit the sound of the piano 2 and receive the determination result of the tuning. A telephone or the like may be used. In addition, it is possible to change the configuration of details within the scope of the gist of the present invention.

It is a figure which shows the outline | summary of a structure of the simple tuning determination system of the piano by one Embodiment of this invention. 3 is a block diagram illustrating a configuration of a rhythm determination device 5. FIG. It is a flowchart which shows the determination process of an octave precision. It is a flowchart which shows the unison precision determination process.

Explanation of symbols

1 Simple tuning judgment system 2 Piano (musical instrument)
3 Mobile phones (terminal equipment)
5 Tuning determination device 6 Microphone 7 Communication device (communication means)
11 CPU (determination means)
12 Frequency analysis unit (frequency analysis means)
15 Communication device (reception means and transmission means)

Claims (4)

A simple tuning determination system for a musical instrument for simply determining the quality of a musical instrument tuning,
A terminal device having a microphone that captures the sound of the instrument and a communication unit that transmits the captured sound of the instrument;
A tuning determination device that determines the quality of the tuning of the musical instrument based on the sound of the musical instrument transmitted from the terminal device,
The tuning determination device is
Receiving means for receiving the sound of the instrument;
Determining means for determining the quality of the instrument based on the received sound data of the instrument;
A simple rhythm determination system for a musical instrument, comprising: a transmission unit configured to transmit information representing a determination result by the determination unit to the terminal device. The tuning determination device further includes frequency analysis means for obtaining the frequency of the sound by analyzing the received sound data of the instrument,
2. The simple rhythm determination of an instrument according to claim 1, wherein the determination unit determines octave accuracy based on a ratio of frequencies of two sounds that are octaves apart from each other, which is obtained by the frequency analysis unit. system. The tuning determination device further includes frequency analysis means for obtaining the frequency of the sound by analyzing the received sound data of the instrument,
2. The simple rhythm determination system for an instrument according to claim 1, wherein the determination means determines unison accuracy based on the number of frequencies of one sound obtained by the frequency analysis means.   4. The simple tuning determination system for musical instruments according to claim 1, wherein the terminal device is a mobile phone.

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