Toshikazu Yoshimi

Piezoelectricity in uniaxially stretched poly(vinylidene fluoride) films and its applications

Abstract Hysteresis characteristics, which are similar to those observed in ferroelectric crystals, are found in uniaxially stretched poly(vinylidene fluoride) under a high electric field above 300 kV/cm at room temperature. Various transducers such as stereophonic headphones, tweeters, microphones and phonograph cartridges have been developed with polarized poly(vinylidene fluoride) films. These transducers have quite simple structures because the diaphragms are piezoelectric films and involve transducing function in themselves.

Study on the Visualization of the Impression of Button Sounds

A lot of attention has been directed at designing various sounds that are treated as noise, such as automobile acceleration sounds and cleaner sounds. The reason is that the idea of sound being a normal part of product operation has permeated society. We focused on sound design and evaluating it for 11 kinds of button sounds. First, an impression was extracted by the semantic differential (SD) method, and the relevance with a time frequency analysis was investigated. Next, we confirmed whether or not the impression changed when a sound that generated a bad impression was processed using adaptive control into a sound that generated a good impression.

A study of evaluating the button sounds

In recent years, much attention has been directed at the sound design which designs various sound treated as noise, such as automobile acceleration sound and cleaner sound, because the point of view sound is a part of products, has permeated. This research considered the sound design and its evaluation about 11 kinds of the button sounds. First, the impression was extracted by the SD method and relevance with time frequency analysis was investigated. Moreover, we also confirmed that an impression changed, when the sound of a bad impression is processed into the sound of a good impression using adaptive control.