Fujitsu Ten Limited

Hideki Matsui

Yuji Tomita

Akira Motojima

Hiroshi Kowaki

Minoru Maehata

Masanobu Maeda

Shinichi Nakaishi

To restrict a loss, or a variation in a loudness, of the sound of a rear speaker if the separation of a two-channel stereo signal degrades in a surround device which generates a four-channel surround signal based on a difference component of the two-channel stereo signal. In a surround device which generates the difference signal based on input left and right channel signal, and generates a driving signal of a front speaker arranged in front of the audience and a driving signal of a rear speaker arranged behind the audience based on the left and right input signals and the difference signal, a part of the driving signal of the front speaker or a part of the two-channel signal is mixed to the driving signal of the rear speaker, and therefore, the loss or the variation in the loudness of the sound of the rear speaker can be restricted even if the separation of the two-channel stereo signal degrades.

Apparatus for generating surround signal from two-channel stereo signal

A navigation apparatus includes a guidance-information creating unit that creates guidance information by acquiring a guiding direction, in which a vehicle should be guided, from preset route information and current position information; an acoustic-image creating unit that creates an acoustic image for notifying a driver of the guidance information; and an acoustic-image control unit that changes at least one of a movement start position of the acoustic image, a direction change position of the acoustic image, a moving amount of the acoustic image, a moving speed of the acoustic image, and a moving locus of the acoustic image according to the current position information and a guiding position in the preset route information.

Navigation apparatus

The present invention was developed in order to realize a multi-channel sound system wherein appropriate output (balance and fader) control can be conducted without adversely affecting the program contents, and a sound system, which can reproduce a plurality of channel signals including at least left and right front channels and a center channel for forward-placed speakers, comprises a gain controller to control the gain of either left or right channel signal and a gain controller to control the gain of the center channel signal depending on the gain control of the left or right channel signal.

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Kobe, Japan

Hideki Matsui