Water depth measuring device
First Claim
1. A water depth measuring device comprising:
- a pressure sensor;
an A/D converter operatively coupled to the pressure sensor that converts the sensed signal of the pressure sensor into a digital value, the digital value corresponding to the start of water depth measuring being the initial digital value;
a comparator operatively coupled to the A/D converter that compares the initial digital value output by the A/D converter with a range of values defined by a first predetermined comparative value and a second predetermined comparative value, and determines whether the initial digital value falls within the range and produces a comparison result based thereon;
an initial value setting circuit operatively coupled to the comparator that, in response to the comparison result of the comparator, adopts the first digital value as an initial value corresponding to a zero meter depth when the initial digital value falls within the range defined by the first and second comparative values; and
a water depth computer operatively coupled to the A/D converter and the initial value setting circuit that computes a water depth value based on the initial value and the digital value derived from the A/D converter.
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Accused Products
Abstract
A depth measuring device suitable for use in a dive watch is provided. A water depth measuring device comprising a pressure sensor, an A/D converter that converts the sensed signal of the pressure sensor into a digital value, the digital value corresponding to the start of water depth measuring being the initial digital value, a comparator that compares the initial digital value output by the A/D converter with a range of values defined by a first predetermined comparative value and a second predetermined comparative value, and determines whether the initial digital value falls within the range and produces a comparison result based thereon, an initial value setting circuit that, in response to the comparison result of the comparator, adopts the first digital value as an initial value corresponding to a zero meter depth when the initial digital value falls within the range defined by the first and second comparative values, and a water depth computer that computes a water depth value based on the initial value and the digital value derived from the A/D converter.
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Citations
31 Claims
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1. A water depth measuring device comprising:
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a pressure sensor; an A/D converter operatively coupled to the pressure sensor that converts the sensed signal of the pressure sensor into a digital value, the digital value corresponding to the start of water depth measuring being the initial digital value; a comparator operatively coupled to the A/D converter that compares the initial digital value output by the A/D converter with a range of values defined by a first predetermined comparative value and a second predetermined comparative value, and determines whether the initial digital value falls within the range and produces a comparison result based thereon; an initial value setting circuit operatively coupled to the comparator that, in response to the comparison result of the comparator, adopts the first digital value as an initial value corresponding to a zero meter depth when the initial digital value falls within the range defined by the first and second comparative values; and a water depth computer operatively coupled to the A/D converter and the initial value setting circuit that computes a water depth value based on the initial value and the digital value derived from the A/D converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification