Method for calibration of step length and arrangement utilizing the method
First Claim
1. A method for measuring the length of a person'"'"'s (1) steps, in which method the distance covered (S) and the number of steps (N) used is measured, wherein in the method the distance covered (S) is measured by transit time measurement of sound frequency pulses (12a, 12b, 12c), which are transmitted using a delay (T) between the pulses;
- the transit time of each sound pulse is measured between the moving person (1, B) and a fixed point (A); and
where before measuring the distance covered a measuring time (M) (300) used for measuring the length of steps is determined and clocks of a transmission means (11) and a reception means (10) of the sound pulses are synchronized before the transmission of a first sound pulse for the overall measuring time (M), whereby the reception means (10) of the sound pulses know both the moments of reception of the sound pulses (12a, 12b, 12c) and the moment of transmission (300) of each sound pulse (12a, 12b, 12c) and that number of steps (N) taken during the measurement are measured by an acceleration transducer (48) carried along by the person.
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Accused Products
Abstract
The invention relates to a method for measuring the length of steps, a measuring arrangement utilizing the method and a sound transmitter and a sound receiver utilized in the measuring arrangement. In the method according to the invention, the distance of the person performing the measurement from a certain fixed point is measured by means of synchronized sound frequency pulses. The number of steps is measured by means of an acceleration transducer carried along by the person. The length of steps is obtained by dividing the distance advanced by the number of steps.
15 Citations
22 Claims
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1. A method for measuring the length of a person'"'"'s (1) steps, in which method the distance covered (S) and the number of steps (N) used is measured, wherein in the method
the distance covered (S) is measured by transit time measurement of sound frequency pulses (12a, 12b, 12c), which are transmitted using a delay (T) between the pulses; -
the transit time of each sound pulse is measured between the moving person (1, B) and a fixed point (A); and
wherebefore measuring the distance covered a measuring time (M) (300) used for measuring the length of steps is determined and clocks of a transmission means (11) and a reception means (10) of the sound pulses are synchronized before the transmission of a first sound pulse for the overall measuring time (M), whereby the reception means (10) of the sound pulses know both the moments of reception of the sound pulses (12a, 12b, 12c) and the moment of transmission (300) of each sound pulse (12a, 12b, 12c) and that number of steps (N) taken during the measurement are measured by an acceleration transducer (48) carried along by the person. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A measuring arrangement for measuring the length of a person'"'"'s (1) steps, which arrangement comprises means for measuring the distance covered (S) and number of steps (N) used, wherein the measuring arrangement—
- the distance covered (S) is arranged to be measured by transit time measurement of sound frequency pulses (12a, 12b, 12c), which are transmitted using a delay (r) between the pulses;
the transit time of each sound pulse is arranged to be measured between a moving person (1, B) and a fixed point (A) and where before measuring the distance covered a measuring time (M) (300) to be used has been determined and clocks of a transmission means (11) and a reception means (10) of the sound pulses have been synchronized before the transmission of a first sound pulse for the overall measuring time (M), whereby the reception means (10) of the sound pulses have knowledge of both the moments of reception of the sound pulses (12a, 12b, 12c) and the moments of transmission (300) of each sound pulse (12a, 12b, 12c), and that number of steps (N) taken during the measurement of the length of steps is arranged to be calculated from acceleration pulses caused by the steps, measured by an acceleration transducer (48) carried along by the person. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
- the distance covered (S) is arranged to be measured by transit time measurement of sound frequency pulses (12a, 12b, 12c), which are transmitted using a delay (r) between the pulses;
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16. A sound receiver (10), wherein it comprises—
- a central processing unit (CPU);
a memory;
a clock function (41) for calculating the transit time of a received sound pulse and for performing the calculation of the distance (S) on the basis of that;
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a means for synchronizing the clock function (41) before a first received sound pulse for the overall measuring time (M);
a user interface (43) for inputting the initial information of the step length measurement and for presenting the measurement result of the calculated length of steps;
a sound frequency receiver (42) for receiving and indicating a sound signal of essentially the frequency of 1,000-2,000 Hz and a power source (44). - View Dependent Claims (17, 18)
- a central processing unit (CPU);
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19. A sound transmitter (11), comprising
a central processing unit (CPU); -
a memory;
a clock function (45) for transmitting a sound pulse used in the measurement at the intervals of a certain delay (r);
for detecting the end of the time (M) defined for the measurement;
for sending a measurement ending pulse;
a means for synchronizing the clock function (45) before transmitting a first sound pulse for the overall measuring time (M);
a user interface (47) for starting the step length measurement;
a sound frequency transmitter (46) for transmitting a sound signal of essentially the frequency of 1,000-2,000 Hz;
a means (48) for detecting an acceleration peak caused by a step and for saving the number (N) of the acceleration peaks detected and—
a power source (44). - View Dependent Claims (20, 21, 22)
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Specification