Sony Ericsson Mobile Communications Ab

Sony Mobile Communications Ab

Markus Mimer

Stefan Gustavsson

Dag Glebe

Dan Anders Edgren

The invention relates to a portable device with an enhanced stereo image, and more particularly a device in which an unsymmetrical placement of loudspeakers is compensated by means of electronic adjustment of the phase and level of the sound. The present invention provides a device () comprising a sound source outputting audio channels in stereo, a sound reproduction system delivering electronic sound signals based on the audio channels to at least two loudspeakers () for sound reproduction with a stereo image. The device further comprises means for adjusting the level and phase of one of the sound signals to one loudspeaker ().

Portable device with enhanced stereo image

A speaker arrangement is described, suitable for improving the sound quality of a small size first speaker. The arrangement comprises a cavity, to which the first speaker is acoustically coupled. A second speaker is also acoustically coupled to the cavity, and the first and second speakers are excited in phase with each other. The first speaker may be an earphone speaker tuned to be held to a user's ear, whereas the second speaker may be a larger ring alert speaker with lower compliance than the first speaker, both of which are incorporated in the same mobile phone. By exciting the second speaker in phase with the first speaker, the second speaker will aid the smaller first speaker's reproduction of sound, particularly in the lower frequency range.

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Stockholm, Sweden

Markus Mimer