Murata Manufacturing Co., Ltd.

Yoshihiro Iwasaki

Shuichi Kawata

Kazuya Nakatera

Shinsuke Shichi

Yoshiaki Katagiri

Yasutada Tanimoto

Katsuhito Omote

A sound transmission system that includes a sound transmission device that is brought into contact with a human body and a sound signal generation device connected to the sound transmission device. The sound transmission device includes an insulator that is brought into contact with the human body, a conductor that is in contact with the insulator, and an input that is provided on the conductor and inputs a driving voltage. One end of the sound signal generation device is connected to the input, and the sound signal generation device supplies the driving voltage based on a sound signal to the sound transmission device.

Sound transmission device and sound transmission system

In an elastic-wave filter device that includes a band-pass filter and a band-eliminate filter connected to the band-pass filter, insertion loss in a pass band is significantly reduced and attenuation in a stop band is significantly increased. The elastic-wave filter device has a pass band and a stop band at frequencies higher than the pass band. The band-pass filter and the first band-eliminate filter are connected in series between an input terminal and an output terminal. A first parallel-arm resonator of the first band-eliminate filter includes a first resonance frequency in the stop band. A second parallel-arm resonator includes a second resonance frequency in the stop band, the second resonance frequency being higher than the first resonance frequency. An impedance value of the first parallel-arm resonator is larger than an impedance value of the second parallel-arm resonator.

Elastic-wave filter device having a band-pass filter and a band-reject filter

Growing community of inventors

Nagaokakyo, Japan

Yoshihiro Iwasaki