21ic News ROHM (ROHM) has recently developed a demonstration experience machine for smartphones and mobile phones that use "cartilage conduction" technology.
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The demonstration experience machine was successfully developed under the guidance of Professor Hirai Yusuke (hereinafter referred to as Professor Hirai), the discoverer of cartilage conduction phenomenon, Nara Prefectural Medical University, Japan. This is a new call mode for answering calls through the vibration of the corner of the phone. From then on, it is possible to make smooth and comfortable calls in a noisy environment.
<Mechanism of cartilage conduction>
Usually, the sound emitted by a speaker or the like is transmitted from the ear hole through the air and then transmitted to the eardrum. In addition, the bone conduction that was discovered early on is that the vibration transmitted to the bone is transmitted directly to the inner ear.
"Cartilage conduction" is the sound that is transmitted from the vibration source of the contact ear cartilage (the portion shown in the cross section of the red outline in the right figure) to the inner ear through direct air conduction, cartilage bone conduction, and cartilage gas conduction. "Direct air conduction" is the usual sound; "Cartilage bone conduction" is through the cartilage, but ultimately comes down to bone conduction. The "cartilage gas guide" is a newly discovered phenomenon of Professor Jingi. The vibration transmitted to the cartilage forms a sound in the external auditory canal and is transmitted to the tympanic membrane, which plays an important role in cartilage conduction. It is characterized by the sound that you want to hear will be emitted near the tympanic membrane. Moreover, as the vibration source increases the volume of the contact pressure of the ear cartilage, the volume increases. When the contact pressure is increased and the ear hole is blocked by the tragus (the cartilage protrusion in front of the ear hole), the volume becomes maximum while The external noise is cut off, and it has the unique feature of being able to listen clearly even in noisy environments.
<Summary and Features of the Demo Experience Machine>
The demonstration experience machine is a brand-new creative form that touches the ear at the upper corner of the smartphone (both left and right), and maximizes the role of cartilage conduction. It has the following four characteristics.
1 Easily increase the volume of the person's voice is small and difficult to hear, it is easy for people to unconsciously put the phone (handset) close to the ear. The cartilage conduction phone raises the contact pressure with the ear cartilage according to the habit of the person, and increases the volume with a natural motion. The touch of the cell phone (handset) is the best form of cartilage conduction.
2 Interrupt the external noise, the volume is louder. The phone (handset) is tighter. When the ear is close to the ear, the ear cartilage (the tragus) will naturally block the ear hole. Therefore, while the external noise is blocked, the volume is louder, and smooth conversation in a noisy environment becomes possible. The touch of a corner is the best form of answering that naturally blocks the ear hole.
3 Prevent the dirty LCD screen from touching the ear with only one corner, so the LCD screen will not be dirty due to sebum or cosmetics on the ear or face. It is an answering form that matches the characteristics of cartilage conduction.
4 Comfortable listening Because the speaker is only used at one corner, the earpiece is comfortable and close to the ear. Even if you use force, it will not flatten your ears like a normal mobile phone. This also achieves an answering form that matches the characteristics of cartilage conduction.
In order to put the "one-point answering form" into practical use, ROHM's demonstration experience machine uses a unique structure that concentrates the vibration source in one corner, achieving more effective cartilage conduction. In addition, by concentrating the vibration source at one corner, the leakage sound of the air-conducting sound from other parts such as the back of the mobile phone is relatively reduced, and the surrounding person is not disturbed, and the privacy-protected call form is also possible.
Regarding the demonstration experience machine, ROHM has not only proposed more than 30 related patent applications, but also plans to cooperate with many machine manufacturers to commercialize them. In addition, it is expected that the cartilage conduction smartphone and the application technology in the mobile phone will be further developed. Therefore, according to the principle of cartilage conduction, ROHM will continue to promote the development of an optimal driver for driving a vibration source and a power supply IC with a driver.
In the future, Roma will work with Prof. Hidei and various machine manufacturers to promote related development and enter the practical stage as soon as possible.
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