Communications: electrical – Continuously variable indicating – Plural transmitters
Reexamination Certificate
1997-10-10
2001-05-08
Horabik, Michael (Department: 2635)
Communications: electrical
Continuously variable indicating
Plural transmitters
C340S539230, C340S870110, C600S508000, C607S032000
Reexamination Certificate
active
06229454
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a telemetric measuring method, in which method two or more different variables are measured by different sensors, and the measurement data on each measured variable is transferred by means of telemetric data transmission to the same receiver unit.
The invention also relates to a telemetric measuring method, in which method at least two different variables, i.e. heartbeat, the speed and/or pedalling cadence of a bicycle, are measured by different sensors, and the measurement data on each measured variable is transferred by means of telemetric data transmission to the same receiver unit.
The invention also relates to a telemetric measuring method, in which method at least two different variables, i.e. heartbeat, the speed and/or operating cadence, such as paddling or rowing cadence, of a watercraft, such as a canoe, a surf board or a boat, are measured by different sensors, and the measurement data on each measured variable is transferred by means of telemetric data transmission to the same receiver unit.
The invention also relates to a telemetric measuring method, in which method at least two of the following variables are measured by different sensors: heartbeat, blood pressure, temperature, blood glucose content, blood oxygen content, and the measurement data on each measured variable is transferred by means of telemetric data transmission to the same receiver unit.
The invention also relates to a telemetric measuring system comprising one or more telemetric transmitter units, a least two different sensors in complete or partial connection with said one or more transmitter units for measuring at least two different variables, the system further comprising one telemetric receiver unit to which the measurement results measured by the different sensors can be sent telemetrically by said one or more transmitter units.
The method can be applied to a personal telemetry measuring device, e.g. a pulse meter.
2. Description of the Prior Art
Telemetric measuring methods are used e.g. for measuring a person's heartbeat. Equipment solutions are often such that the unit for measuring and transmitting the heartbeat data is arranged around the person's chest as a transmitter belt, from which the measurement data is transferred telemetrically by means of inductive coupling to a receiver unit, often implemented as a receiver strap on a person's wrist. In cycling, the receiver unit may be arranged e.g. at the bicycle handlebar.
The transmitters of e.g. heartbeat measuring devices typically send a burst of about 5 kHz each time they detect an ECG signal. The transmitter circuit of the transmitter unit consists of a resonance circuit, activated controlled by the heartbeat. The receiver unit calculates the pulse frequency, i.e. the heart rate, on the basis of the time difference between successive transmitted signals, i.e. the time difference of the bursts, the information to be transmitted, i.e. the pulse frequency or heart rate, being included in the transmission coded in the interval between the pulses. In case of a solution is used in which a group of two or more pulses is sent at each heartbeat, the pulse frequency, i.e. heart rate, can be coded inside the pulse group in the length of the interval between the pulses, but in this solution the technical implementation is more complex than usually.
When a plurality of people are using pulse measuring devices near each other, the problem that may arise is that the receiver unit may receive a pulse transmission transmitted by the transmitter unit of another person. To eliminate this drawback, it is known to use a method known from this applicant's patent publication WO 95/05578, in which a pulse group with at least two identifier pulses is used for transmitting the pulse data, the interval between the identifier pulses corresponding to the specific interval determined for each transmitter-receiver pair, the receiver unit being able to identify the transmission pulse groups addressed to it. Said method eliminates said drawbacks.
However, in present usage a need has arisen for telemetric transmission of measurement data on several different measured variables, e.g. heartbeat, pedalling speed and pedalling cadence, to the same receiver.
The characteristics of known solutions are not sufficient in the described case. In known solutions, where measurement data on several different variables is measured and received, a receiver unit may misinterpret the pulse train formed by the received measurement data on several different measured variables, leading to erroneous measurement data.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide a new type of method by means of which the problems with known solutions can be avoided and a method is provided by means of which said drawbacks are eliminated and reliable disturbance-free operation is achieved when transferring the measurement data on several measured variables to a receiver.
This object is achieved with the method of the invention, characterized in that in telemetric data transmission carried out to a receiver unit the transmission pulse groups included in the measurement data on a single measured variable comprise, in the transmission pulse group, at least two intervals formed between at least three identifier pulses, the combination of said intervals being specific to that particular measured variable, whereby for identifying the measurement data on different measured variables, the interval combination of the transmission pulse group of that particular measured variable differs from the interval combinations shown by other measured variables in their specific pulse group or a pulse group sequence formed by their specific pulse groups, and that, once the receiver unit has detected an interval combination according to said at least two intervals in the pulse train it received, the transmission pulse group is identified as an transmission pulse group relating to a specific measured variable, and that a measured variable value concerning each measured variable is determined on the basis of one or more transmission pulse groups identified for the different measured variables in this manner.
The system of the invention is characterized in that, for each measured variable, the system comprises a shaping element for shaping the measured signal before telemetric transmission in such a way that on the basis of each measured signal a sequence is generated for each variable of such specific pulse groups in which a pulse group comprises at least two such intervals confined by at least three pulses that are different from the intervals of the pulse groups of other variables, and that the receiver unit comprises an identifier part for identifying each measured variable on the basis of the intervals of the pulse group, and that said identifier part is in connection with a calculation unit for calculating the values of the different measured variables.
Generally, a method having the characteristics described in the invention may be applied to a case with at least two different measured variables, but it is particularly applicable to bicycle use, the heartbeat of the cyclist, the speed and/or pedalling cadence of the bicycle being the measured variables. The invention is also applied to watercrafts, the measured variables being a person's heartbeat, the speed and operating cadence of the watercraft, such as the paddling or rowing cadence. The invention may also be applied to a case in which a noteworthy part, if not all, of the measured variables are measurements of the human body, such as two or more of the following: heartbeat, blood pressure, temperature, blood glucose content, blood oxygen content.
The method and system of the invention offer several advantages. The method and system of the invention enable telemetric transmission and reception of different measured variables to be carried out in such a way that a receiver unit can identify the pulses of the differe
Heikkila Ilkka
Niemelä Urpo
Hoffmann & Baron , LLP
Horabik Michael
Polar Electro OY
Wong Albert K.
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