Sony Corporation

Masao Horie

Yoshimi Makino

Akihisa Narimatsu

Yusuke Sunada

Junta Inari

A microphone output transmission circuit for a capactive microphone such as an electret microphone employs a differential amplifier to provide a transformerless balanced connection to a microphone transmission line, either at the transmission end or at the reception end thereof. Power is applied in a phantom connection by superimposing a DC voltage on two balanced signal conductors of the transmission line, and using the shield thereof as a ground return line. A pair of microphones with oppositely-directed sound-gathering planes can be connected to respective inputs of a differential amplifier at the transmission end, so that the two microphones together have a bidirectional characteristic.

Microphone output transmission circuit

A multiple magnetoresistance element includes a first stripe group and a second stripe group which comprise a plurality of stripes electrically connected in series with each other and spaced from each other by a predetermined distance. The stripes are made of ferromagnetic material having an anisotropic effect of magnetoresistance and have a plurality of main current path portions. The first stripe group and the second stripe group are electrically connected to each other and spaced from each other by a predetermined distance. An output terminal is connected to a connecting point of the first stripe group and the second stripe group. Current supply terminals are connected to ends of the first stripe group and the second stripe group.

Growing community of inventors

Tachikawa, Japan

Masao Horie