Speed esimation for digital cordless telephones
First Claim
1. A method of recognizing high speed movement of a digital cordless telephone set, the method comprising:
- measuring a received electric field level of the digital cordless telephone set in a predetermined time;
setting a field strength threshold level by adding an offset value to an average of the received electric field level;
setting a threshold variation cycle period of a received electric field level of the digital cordless telephone set corresponding to a reference speed for the high speed movement judgment;
measuring the variation cycle period of the received electric field level of the digital cordless telephone set between successive times the received electric field level exceeds the field strength threshold level; and
recognizing that the digital cordless telephone set is in high speed movement when the measured variation cycle period of the received electric field level of the digital cordless telephone set becomes shorter than the threshold variation cycle period.
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Accused Products
Abstract
In response to the resetting of a timer 6, a received electric field level measuring unit 3 measures the received electric field level in a predetermined time, and a control unit 4 computes the average level Vav in that time and compares this level Vav with a threshold level Vth. The unit 4 then computes a cycle period Tav of generation of levels in excess of the threshold level Vth in a predetermined time, and compares this cycle period Tav with a threshold cycle period Tth for high speed movement judgment as set in a memory 5. When Tav is shorter than Tth, the unit 4 judges and recognizes that the telephone set is in high speed movement, so that it can give an alarm to the person carying the telephone is set while at the same time changing the received sound level or automatically informing that the telephone set is in high speed movement.
55 Citations
11 Claims
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1. A method of recognizing high speed movement of a digital cordless telephone set, the method comprising:
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measuring a received electric field level of the digital cordless telephone set in a predetermined time;
setting a field strength threshold level by adding an offset value to an average of the received electric field level;
setting a threshold variation cycle period of a received electric field level of the digital cordless telephone set corresponding to a reference speed for the high speed movement judgment;
measuring the variation cycle period of the received electric field level of the digital cordless telephone set between successive times the received electric field level exceeds the field strength threshold level; and
recognizing that the digital cordless telephone set is in high speed movement when the measured variation cycle period of the received electric field level of the digital cordless telephone set becomes shorter than the threshold variation cycle period. - View Dependent Claims (2, 3)
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4. A digital cordless telephone set comprising:
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means for measuring a received electric field level of the digital cordless telephone set in a predetermined time;
means for setting a field strength threshold level by adding an offset value to an average of the received electric field level;
means for setting a threshold variation cycle period of a received electric field level of the digital cordless telephone set corresponding to a reference speed for the high speed movement judgment;
means for measuring the variation cycle period of the received electric field level of the digital cordless telephone set between successive times the received electric field level exceeds the field strength threshold level; and
means for recognizing that the digital cordless telephone set is in high speed movement when the measured variation cycle period of the received electric field level of the digital cordless telephone set becomes shorter than the threshold variation cycle period. - View Dependent Claims (5, 6)
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7. A mobile apparatus receiving radio wave transmitted from a plurality of radio wave transmission apparatuses which are located at a predetermined distance or distances, comprising:
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measuring circuit for measuring variation cycle period of strength of the received radio wave; and
judging circuit for judging high speed movement state of the mobile apparatus when the variation cycle period of the received radio wave is shorter than a threshold cycle period determined based on the predetermined distance or distances, wherein said variation cycle period of strength is determined by a time period that it takes for two successive received radio waves to exceed a field strength threshold, said field strength threshold value is determined by adding a predetermined value to an average received radio wave strength.
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8. A method of judging a high speed moving state of a mobile apparatus which is receiving radio waves transmitted from a plurality of radio wave transmission apparatuses that are located at a predetermined distance or distances, comprising:
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measuring a variation cycle period of the strength of the received radio wave; and
judging a high speed movement state of the mobile apparatus when the variation cycle period of strength of the received radio wave is shorter than a threshold cycle period determined based on the predetermined distance or distances, wherein said variation cycle period of strength is determined by a time period that it takes for two successive received radio waves to exceed a field strength threshold and said field strength threshold is determined by adding a predetermined value to the average received radio wave strength.
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9. A method of recognizing high speed movement of a digital cordless telephone set, the method comprising:
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measuring a received electric field level of the digital cordless telephone set in a predetermined time;
setting a threshold variation cycle period of a received electric field level of the digital cordless telephone set corresponding to a reference speed for the high speed movement judgment;
measuring the variation cycle period of the received electric field level of the digital cordless telephone set between successive times the received electric field level exceeds a field strength threshold level, wherein said field strength threshold is a function of an average field strength level of the receive electric field and a predetermined offset value; and
recognizing that the digital cordless telephone set is in high speed movement when the measured variation cycle period of the received electric field level of the digital cordless telephone set becomes shorter than the threshold variation cycle period.
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10. A digital cordless telephone set comprising:
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means for measuring a received electric field level of the digital cordless telephone set in a predetermined time;
means for setting a threshold variation cycle period of a received electric field level of the digital cordless telephone set corresponding to a reference speed for the high speed movement judgment;
means for measuring the variation cycle period of the received electric field level of the digital cordless telephone set between successive times the received electric field level exceeds a field strength threshold level wherein said field strength threshold is a function of an average field strength level of the receive electric field and a predetermined offset value; and
means for recognizing that the digital cordless telephone set is in high speed movement when the measured variation cycle period of the received electric field level of the digital cordless telephone set becomes shorter than the threshold variation cycle period.
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11. A mobile apparatus receiving radio wave transmitted from a plurality of radio wave transmission apparatuses which are located at a predetermined distance or distances, comprising:
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measuring circuit for measuring variation cycle period of strength of the received radio wave; and
judging circuit for judging high speed movement state of the mobile apparatus when the number of the received radio wave that exceed a given field strength within a predetermined time period is greater than a threshold value determined based on the predetermined distance or distances, wherein said number is determined by counting the number of received radio waves to exceed a field strength threshold within a predetermined time period, where said field strength threshold value is determined by adding a predetermined value to an average received radio wave strength.
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Specification