Pedometer
According to an embodiment, a pedometer includes an acceleration detecting circuit configured to detect acceleration from an output of an acceleration sensor and output an acceleration signal, a band-pass filter configured to remove, from the acceleration signal, a frequency component generated by arm swinging during walking and included in the acceleration signal, and a step counter configured to count a number of steps based on the acceleration signal outputted from the band-pass filter.
1. A pedometer comprising:
an acceleration detecting circuit configured to detect acceleration from an output of an acceleration sensor, which detects acceleration in one or more directions, and output an acceleration signal;
a first band-pass filter configured to remove, from the acceleration signal, a frequency component generated by arm swinging during walking and included in the acceleration signal;
a first counter configured to count a number of steps based on the acceleration signal outputted from the first band-pass filter;
a second band-pass filter configured to remove, from the acceleration signal, a frequency component generated by arm swinging during running and included in the acceleration signal; and
a second counter configured to count a number of steps based on the acceleration signal outputted from the second band-pass filter.
2. The pedometer according to claim 1 , further comprising:
a first energy detecting circuit configured to detect first energy based on the acceleration signal outputted from the first band-pass filter; and
a selecting and outputting circuit configured to output a count value of the first counter when the first energy detecting circuit outputs a value of the first energy.
3. The pedometer according to claim 1 , wherein the first band-pass filter is a filter that transmits a frequency component of 1.5 Hz to 2.5 Hz.
4. The pedometer according to claim 1 , wherein the second band-pass filter is a filter that transmits a frequency component of 2.5 Hz to 4 Hz.
5. The pedometer according to claim 1 , wherein the pedometer is provided in a wristband or a watch wound around an arm of a user.
6. The pedometer according to claim 1 , further comprising a communication interface for outputting, by wireless or by wire, information concerning the number of steps counted by the first counter that counts the number of steps.
7. A pedometer comprising:
an acceleration detecting circuit configured to detect acceleration from an output of an acceleration sensor, which detects acceleration in one or more directions, and output an acceleration signal;
a first band-pass filter configured to remove, from the acceleration signal, a frequency component generated by arm swinging during walking and included in the acceleration signal;
a first counter configured to count a number of steps based on the acceleration signal outputted from the first band-pass filter;
a first energy detecting circuit configured to detect first energy based on the acceleration signal outputted from the first band-pass filter;
a selecting and outputting circuit configured to output a count value of the first counter when the first energy detecting circuit outputs a value of the first energy;
a second band-pass filter configured to remove, from the acceleration signal, a frequency component generated by arm swinging during running and included in the acceleration signal;
a second counter configured to count a number of steps based on the acceleration signal outputted from the second band-pass filter; and
a second energy detecting circuit configured to detect second energy based on the acceleration signal outputted from the second band-pass filter, wherein
when the second energy detecting circuit outputs a value larger than a value outputted by the first energy detecting circuit, the selection and outputting circuit selects and outputs a count value of the second counter and, when the first energy detecting circuit outputs a value larger than a value outputted by the second energy detecting circuit, the selecting and outputting circuit selects and outputs the count value of the first counter.
8. The pedometer according to claim 7 , wherein the first band-pass filter is a filter that transmits a frequency component of 1.5 Hz to 2.5 Hz.
9. The pedometer according to claim 7 , wherein the second band-pass filter is a filter that transmits a frequency component of 2.5 Hz to 4 Hz.
10. The pedometer according to claim 7 , wherein the pedometer is provided in a wristband or a watch wound around an arm of a user.
11. The pedometer according to claim 7 , further comprising a communication interface for outputting, by wireless or by wire, information concerning the number of steps counted by the first counter that counts the number of steps.