JP7545733B2 - Noise embedding method, noise embedding device, noise-embedding sound wave generation program, and recording medium storing the noise-embedding sound wave generation program - Google Patents

Description

The present invention relates to a noise embedding method, a noise embedding device, noise-embedding sound waves, a recording medium storing noise-embedding sound waves, a noise-embedding sound wave generation program, and a recording medium storing a noise-embedding sound wave generation program, which can reduce discomfort caused by noise that humans find unpleasant.

In everyday life, people may hear noises that they find unpleasant. If you want to avoid such unpleasant sounds, you can try to deal with the situation by leaving the area or covering your ears. However, there are times when you have to stay close to the source of the sound, and covering your ears with both hands greatly restricts your movements. Therefore, when you encounter an unpleasant situation (environment) caused by abnormal noise, there are many cases where you have to tolerate the situation.

Furthermore, it cannot be denied that continuing to listen to such unpleasant sounds can lead to poor mental health, and if such unpleasant sounds are generated in commercial facilities, many people will avoid visiting the store, which will undoubtedly have an impact on customer numbers. On the other hand, if a product emits noise, there is an extremely high risk that people will avoid using it, even if it is functionally superior, and this will have a negative impact on purchasing behavior.

In the past, so-called noise cancellation methods and devices have been proposed as a way to eliminate such unpleasant sounds. As described in Patent Document 1, this noise cancellation method generates a sound that is in opposite phase to the noise and has the same frequency as the noise, and overlaps this sound with the noise to cancel it out.

JP 2020-177174 A

It is necessary to reduce the discomfort felt by people when they are near noise sources that occur in daily life and that they find unpleasant. By reducing the discomfort felt by noise that is unavoidably generated by the structure of the machine itself, or by noise that is unavoidable due to the environment, it is possible to increase the comfort felt when using the product and create an environment in which people can be comfortable even when they are in that environment.

In this regard, in the noise cancellation method described above, because the noise generated by the device is used to cancel out the noise, outside sounds are barely audible. In other words, sounds that indicate danger, such as the sound of an approaching car or train, or the sound of machinery operating, will not be audible, and there is a risk that the person will not be able to take action to avoid the danger.

Therefore, the present invention has been proposed to solve the problems associated with the above-mentioned noise cancellation method and device, and has an object to provide a noise embedding method, a noise embedding device , a noise embedding sound wave generation program, and a recording medium storing a noise embedding sound wave generation program, which can reduce the discomfort caused by noise that humans find unpleasant and ensure that sounds that alert people to danger are not inaudible.

The present invention has been proposed to solve the above problems, and the first invention (the invention described in claim 1) relates to a noise embedding method, which is characterized by analyzing noise in a target space, performing frequency decomposition and detecting periodicity, determining a chord containing the frequency-resolved frequency components, determining a rhythm that is in tune with the detected periodicity, and generating the determined chord with the determined rhythm.

The noise embedding method according to the first aspect of the invention determines and generates a rhythm that is in tune with the chords and periodicity that contain the frequency components based on the frequency components and periodicity obtained by analyzing the noise, thereby reducing the discomfort caused by noise that people find unpleasant.

The second invention (the invention described in claim 2) relates to a noise embedding device, and is characterized by comprising an analysis unit that receives noise, analyzes the noise, and performs frequency resolution and periodicity detection; a calculation unit that determines a chord containing the frequency components frequency resolved by the analysis unit and a rhythm that is in tune with the detected periodicity; and a generation unit that generates and outputs the chord determined by the calculation unit with the determined rhythm.

The noise embedding device according to the second invention determines, generates and outputs a rhythm that is in tune with the chords and periodicity that contain the frequency components based on the frequency components and periodicity obtained by analyzing the noise, thereby reducing the discomfort caused by noise that people find unpleasant.

The third invention (the invention described in claim 3 ) relates to a noise-embedded sound wave generation program, which is characterized in that noise in a target space is input, the noise is analyzed, frequency decomposition and periodicity detection are performed, a chord containing the frequency-decomposed frequency components is determined, a rhythm that is in tune with the detected periodicity is determined, and the determined chord is generated with the determined rhythm.

The noise-embedding sound wave generation program of the third invention determines and generates a rhythm that is in tune with the chords and periodicity containing the frequency components based on the frequency components and periodicity obtained by analyzing the noise, thereby reducing the discomfort caused by noise that people find unpleasant.

The fourth invention (the invention described in claim 4 ) relates to a recording medium, characterized in that the noise-embedding sound wave generation program according to the third invention (the invention described in claim 3 ) is stored therein.

The recording medium of the fourth invention can store and execute a program that determines and generates rhythms that are in tune with chords and periodicities containing frequency components based on the frequency components and periodicity obtained by analyzing noise, thereby reducing the discomfort caused by noise that people find unpleasant.

The noise embedding method according to the first invention (the invention described in claim 1) can reduce the discomfort caused by noise that people find unpleasant, and ensure that sounds that alert people to danger are not inaudible.

In addition, the noise embedding device according to the second invention (the invention described in claim 2) can reduce the discomfort caused by noise that people find unpleasant, and does not prevent people from being unable to hear sounds that alert people to danger.

According to the noise-embedding sound wave generating program of the third invention (the invention described in claim 3 ), the discomfort caused by noise that people find unpleasant can be reduced, and sounds that alert people to danger can be heard without being inaudible.

According to the recording medium of the fourth aspect of the invention (the invention described in claim 4 ), it is possible to reduce discomfort caused by noise that people find unpleasant, and sounds that alert people to danger will not become inaudible.

1 is a procedure for explaining a noise embedding method according to the present invention. 1 is a graph showing an example of frequency components and periodicity obtained by analyzing noise. FIG. 13 is a diagram showing the results of period analysis of noise components. FIG. 13 is a diagram showing the results of equalizing and analyzing noise components. This is a diagram showing the results of composing music using material in which the noise components have been decomposed. FIG. 13 shows the results of adjusting the composed music. FIG. 13 is a diagram showing the result of generating a musical score of composed music. 1 is a block diagram showing a configuration of a noise embedding device according to the present invention for executing a noise embedding method according to the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBEDDED Noise embedding method, noise embedding device , noise embedding sound wave generating program, and recording medium storing the noise embedding sound wave generating program according to the present invention will be described in detail below with reference to the drawings.

When viewed as components of sound, whether it is noise or not, it can be broken down into multiple musical scales. Furthermore, in many cases, noise itself has a certain periodicity. Reasons why humans find noise unpleasant include discordant combinations of musical scales and sounds that are unfamiliar to the ear. This invention is a service that provides a mechanism that physically breaks down the components of noise, reconstructs it as music using the resulting musical scales and periods, and plays this music in the space where the noise is generated, thereby reducing the elements that people find unpleasant.

[Noise Concealment Method]
FIG. 1 is a procedure for explaining the noise embedding method according to the present invention.

(1) Acquire and analyze the abnormal sound to determine its period and frequency.
In this noise embedding method, as shown in Fig. 1, first, noise in a target space is analyzed, and periodicity is detected and frequency decomposition is performed (step 1). The frequency decomposition can be performed by Fourier transform using a spectrum analyzer.

Figure 2 is a graph showing an example of frequency components and periodicity obtained by analyzing noise. Figure 3 shows the results of periodic analysis of noise components.

For example, in the case of a motor, as shown in Figures 2 and 3, there is a "swell" (periodicity) created by the motor's rotation speed, and this "swell" (periodicity) (e.g., 25 BPM) is considered to be the rhythm of musical tempo (BPM) (lower diagram of Figure 2).

Figure 4 shows the results of equalizing and analyzing the noise components.

The waveform of the motor sound (top of Figure 2) is analyzed and broken down into the frequencies present in it, as shown in Figure 4, and these are assigned to musical notes, for example, D, F#, G, and B (bottom of Figure 2). Sounds that are heard by the ear as noise can also be broken down into a combination of multiple frequencies (musical notes) by analyzing the waveform.

(2) Create (compose) a new rhythm that is synchronized with the detected periodicity (tempo (BPM)). As shown in Figure 1, a chord containing frequency-resolved frequency components (scale) is determined, and a rhythm that is synchronized with the detected periodicity is determined (composed) (step 2).

Figure 5 shows the results of composing music using material that has had the noise components broken down.

As shown in Figure 5, ambient sounds that are similar to noise waveforms are created from sample sounds of various musical instruments, and are combined with sounds in the detected frequencies (scales) to create several types of chords (harmonies).

(3) Based on the rhythm of the detected tempo (BPM), a new rhythm that synchronizes with that tempo is created.

Also, based on this new rhythm, a loop will be created using music software (pro tools).

In the case of a motor, a rhythmic loop that is synchronized with the rotation speed can be created by combining samples of musical instruments or natural sounds that have waveforms and sound qualities similar to the components of the noise. In the case of a compressor, a sound that is similar to the waveform of the noise can be created by combining the sounds of various musical instruments, and the compressor's noise period and timing can be programmed to match randomly.

Using these methods, we create 10-20 types of loops whose main components are made up of decomposed noise sounds.

(4) The determined chord is generated (performed) with the determined rhythm (step 3).
FIG. 6 shows the results of adjusting the composed music.

As shown in Figure 6, a loop created based on the noise components and a recording of actual motor or compressor noise can be assigned to channels on a music software and overlaid on the noise to verify the combination of loops that can reduce the noise. It is preferable to edit each assigned channel by applying effects such as equalizer and reverb, and adjust the volume for each channel.

(5) Each track is composed as a piece of music. Figure 7 shows the result of the composed music being generated as a musical score.

As shown in Figure 7, by composing each track created using noise components as if it were a piece of music, the sound source composed by converting the noise into a musical form and incorporating it can eliminate the unpleasantness of noise.

[Noise-embedding sound wave generation program]
The noise embedding method according to the present invention may be executed in a noise embedding device, with the above-mentioned analysis and determination being performed by a computer device according to a program. Also, the above-mentioned chord generation (performance) may be performed by an automatic performance device.

In other words, the noise-embedded sound wave generation program of the present invention inputs noise in a target space, analyzes the noise, performs frequency resolution and detects periodicity, determines a chord containing the frequency-resolved frequency components, determines a rhythm that is in tune with the detected periodicity, and generates the determined chord with the determined rhythm.

[Recording medium storing a noise-embedding sound wave generation program]
A recording medium according to the present invention is a recording medium on which the above-mentioned noise-embedding sound wave generating program is stored.

The noise embedding method according to the present invention is implemented by loading and executing the noise embedding sound wave generation program from this recording medium.

[Noise Concealment Device]
FIG. 8 is a block diagram showing the configuration of a noise embedding device according to the present invention for executing the noise embedding method according to the present invention.

As shown in Figure 8, this noise embedding device includes an analysis unit 1 that receives noise, analyzes the noise, and performs frequency resolution and periodicity detection. This noise embedding device also includes a calculation unit 2 that determines a chord containing the frequency components frequency resolved by the analysis unit 1 and a rhythm that is in tune with the detected periodicity. This noise embedding device also includes a generation unit 3 that generates and outputs the chord determined by the calculation unit 2 with the determined rhythm.

In this noise embedding device, the noise embedding sound wave generation program according to the present invention is executed.

[Noise-embedding sound waves]
The noise-embedding sound wave is generated in a space containing a specific noise whose frequency components and periodicity have been analyzed as described above, and serves to embed the specific noise.

This noise-embedding sound wave is the sound wave generated (played) by step 3 in Figure 2, as described above. This noise-embedding sound wave is composed of chords that contain the frequency components of the specific noise, and thus creates a rhythm that is synchronized with the periodicity of the specific noise, making it possible to eliminate the unpleasantness of the specific noise.

As described above, according to the present invention, by using the elements that make up noise to compose and layer music that matches the atmosphere of the space, the components of the noise blend into the music, and the listener can experience it as "music" rather than as noise. In particular, when the music is layered from the beginning in a space where noise is generated, the noise is less likely to be recognized as noise, and stress caused by noise can be greatly reduced.

According to the present invention, it is possible to investigate and analyze noise, and compose and provide music using its constituent elements. In addition, by investigating and analyzing noise, it is possible to select existing music with similar elements from the obtained constituent elements, and automatically select music that can reduce noise for music distribution services such as the Internet and cable broadcasting, where the user selects the music to be played.

1 Step 1: Analysis section 2 Step 2: Calculation section 3 Step 3: Generation section

Claims (4)

Analyze the noise in the target space, perform frequency decomposition and detect periodicity,
determining a chord including the frequency components obtained by the frequency decomposition;
determining a rhythm entrained to said detected periodicity;
generating said determined chord with said determined rhythm. an analysis unit that receives noise, analyzes the noise, and performs frequency resolution and periodicity detection;
a calculation unit for determining a chord including the frequency components frequency-resolved by the analysis unit and a rhythm synchronized with the detected periodicity;
a generating unit that generates and outputs the chord determined by the calculation unit with the determined rhythm. Noise in the target space is input, the noise is analyzed, frequency decomposition and periodicity detection are performed,
determining a chord including the frequency components obtained by the frequency decomposition;
determining a rhythm entrained to said detected periodicity;
A noise-embedding sound wave generating program, which generates the determined chord with the determined rhythm . A computer program storing the noise-embedding sound wave generating program according to claim 3.
A recording medium comprising: