Suunto Oy

Tapani Nevalainen

Tero Koivisto

Mikko Pänkäälä

Kati Sairanen

According to an example aspect of the present invention, there is provided an apparatus comprising two charge amplifiers configured to receive input from an acceleration sensor and to each produce one first output signal, a differential amplifier configured to receive the first output signals and to amplify a difference between the first output signals to produce two second outputs signals.

Seismocardiography

According to an example aspect of the present invention, there is provided an apparatus for heartbeat detection, comprising: means for forming a first amplified signal and a second amplified signal on the basis of an input signal representative of heartbeat, means for forming a third signal by inverting the second signal and adding a base voltage, and means for indicating an overlap of the first signal and the third signal.

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Turku, Finland

Tapani Nevalainen