JP2008253470A5

JP2008253470A5 -

Info

Publication number: JP2008253470A5
Application number: JP2007097986A
Authority: JP
Filing date: 2007-04-04
Publication date: 2010-04-22
Anticipated expiration: 2027-04-04

Claims

A setting unit for setting a one-way distance when the swimmer swims in a round trip;
  A direction change detection unit for detecting that the swimmer has changed direction;
  Each time the direction change detection unit detects that the direction has changed, a swimming distance calculation unit that calculates a swimming distance obtained by cumulatively adding the one-way distance;
  A notification unit for reporting the swimming distance calculated by the swimming distance calculation unit;
  The said direction change detection part determines whether a swimmer changed the direction based on the change of the acceleration signal of a swimmer's predetermined part, The swimming distance measuring device characterized by the above-mentioned.

The swimming distance measuring device according to claim 1,
The direction change detection unit includes a frequency analysis unit that performs frequency analysis on the acceleration signal to obtain a frequency spectrum, and determines whether the swimmer has changed direction based on a change in the frequency spectrum. A swimming distance measuring device.

The swimming distance measuring device according to claim 2,
The said direction change detection part specifies a swimmer's stroke pitch from the said frequency spectrum, and determines whether a swimmer changed the direction based on the change of this stroke pitch, The swimming distance measuring device characterized by the above-mentioned.

In the swimming distance measuring device according to claim 3,
The said direction change detection part specifies a swimmer's stroke pitch from the said frequency spectrum, and determines whether a swimmer changed the direction based on ratio of the front and back stroke pitch, The swimming distance measuring device characterized by the above-mentioned.

In the swimming distance measuring device according to any one of claims 1 to 4,
It has a water detector that detects water landing and water separation,
The swimming distance calculation unit starts swimming distance calculation processing when the water detection unit detects landing, and ends swimming distance calculation processing when the water detection unit detects water separation. A swimming distance measuring device.

In the swimming distance measuring device according to claim 5,
When the water detection unit detects water separation during the swimming distance calculation process, the water detection unit detects water separation until a predetermined set period elapses from this detection time. In such a case, the swimming distance measuring device is characterized by terminating the calculation process of the swimming distance.

In the swimming distance measuring device according to any one of claims 1 to 6,
It has a swimming time measurement unit that measures swimming time,
When the swimming distance calculation unit detects that the direction change detection unit has changed direction, the swimming distance calculation unit calculates a movement distance per unit time based on a ratio of the swimming distance and the swimming time until then, and the unit time Each time elapses, the swimming distance is calculated by accumulatively adding the moving distance to the swimming distance.