In the introduction of acoustic books and literature, we will introduce books that our R & D representators are always referring to and papers that are attracting attention.
The links to the books and literature introduced are also posted, so please use it if you are interested.
The links to the books and literature introduced are also posted, so please use it if you are interested.
Journal of Aes, feature Article
Volume 67, Number 11, NOV 2019
Page.914-919
https://www.aes.org/e-lib/browse.cfm?elib=20704
Keywords: Hear-Through, noise canceling, bone conduction
Volume 67, Number 11, NOV 2019
Page.914-919
https://www.aes.org/e-lib/browse.cfm?elib=20704
Keywords: Hear-Through, noise canceling, bone conduction
"The future where headphone technology is very active beyond the frame of audio devices is right there!"
By reading this literature, new headphones not only play the role of audio equipment to listen to music, but also provide the functions that are necessary to improve daily life, and realize a human -friendly society. I felt it was more important.
The article mentioned this time is a review of the published papers published in AES International Conference on Headphone Technology in San Francisco in San Francisco. The author is originally a professor at the University of Surrey, the University of Surrey, who is currently a consultant Technical Writer in The Journal of the Audio Engineering Society (JAES).
One of the most interesting themes in this article is about "Hear-Through".
It is sometimes called the outer sound import function, and you may be familiar with the name. If you wear headphones and earphones, your ears will be blocked and you will not be able to hear the surrounding environmental sounds and announcement sounds. Therefore, such issues are solved by incorporating peripheral tones from the microphone implemented in headphones and earphones, and outputting the captured sound to headphones and earphones. Hear-Throothing plays a very important role not only as a function of headphones and earphones, but also in devices that support hearing, such as hearing aids.
The published paper defines Hear-Through that "the result that is perceived by inserting the device into the ears and not operating it is the same." Therefore, it is necessary to achieve the same amplitude frequency characteristics near the eardrum, which is important for high accurate amplitude frequency correction. In order to achieve this, it is necessary to select the optimal microphone and select a SOC that can process low -delay digital signal processing. In addition, in the case of an open -type earphone, the interaction with the processed sound is reflected by the natural sound, the combination filter effect is reduced, the clarity of the sound is reduced, and the external sound is adopted. Therefore, real -time processing is also important, where there is no delay such as a comb -type filter. In addition, it is also referred to as the individuality mainly caused by the influence of the anoperia causes a difference in tone and errors in localization perception. Hear-Through, which is becoming commonplace in recent earphones, is realized by several important elemental technology, and if it can evolve even more technology in each element, in more situations. We can expect to be useful for life.
On the other hand, bone conduction earphones are attracting attention in the market as a device that can listen to music without blocking their ears.
It is useful for jogging and running, and it feels popular. In this article, the results are reported by investigating the relationship between the bone conduction earphones and the spatial perception in relation to the study of the wearable devices that combine hearing and vision. Experiments that investigate the perception of sound image -positioning suggest that the errors in the osteopathic earphones increase the errors in bone conduction earphones compared to the use of normal headphones. It has also been proposed that many errors obtained in this experiment could be improved by adding visual clues. The practical use of hearing and visual complements can be expected to be applied to the extended reality (XR), for example.
The last one in this article is noise canceling technology.
As a function that is commonplace in recent headphones and earphones, it is a noise cancellation technology that has been recognized by general users, but each manufacturer claims to be "maximum ○ DB", etc. for general users. There is also a tendency to express its performance exaggeratedly. In order to correctly understand the performance of noise canceling, it is possible to objectively evaluate how the noise's amplitude frequency characteristics of noise are attenuated by using a proper measurement method as a change in frequency characteristics. I need it. In this article, the use of an average adult head and torso, called Head and Torso Simulators (Hats), the simulation of a noise environment with a variety of non -correlated sound sources, and the headphones to HATS. Proposals have been made, such as using multiple measurements and adopting the average value in order to eliminate the variation of the measured value due to the wearing condition of the earphones. In addition to establishing a measurement method that enables such objective performance evaluation, it is very important to study how people feel the silence realized by noise canceling technology, and these two elements are stuffy every day. I think that if you repeat the verification, you will be able to create products that use -friendly technology development that are kind to the world.
I myself use earphones with noise cancellations and Hear-Through functions, and I realize that the effects and the technologies that support the effects may develop further. I think this article, which can learn about the current status and future prospects of these technologies that support audio devices that are very active over the music listening equipment, are very useful.
Shake
