Boots – shoes – and leggings
Patent
1990-03-26
1993-07-06
Lee, Thomas C.
Boots, shoes, and leggings
395800, 3649269, 364940, 3649401, 364DIG2, 364264, G06F 906, G06F 300, G06F 700
Patent
active
052261239
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an addressing device as described in the claims.
Addressing devices of the described kind are used for diverse applications. An example of such an application is found in DE-A-28 00 185, where the cable is used for leakage detection in district heating pipelines by temperature measurement by thermistors. It is evident that the present invention is not restricted to such applications, but can be used in any application where the selection of multiple addressable units is necessary.
U.S. Pat. No. 4,162,484 proposes to select the addressable unit by encoded addresses. Consequently, electronic circuitry to code and decode the address signal is necessary. In EP-A-0 043 431 one can find a proposition for a simplified circuitry where the address code is a predetermined number of pulses, but even here a selecting means for the received pulses and means to code and decode them are necessary.
SUMMARY OF THE INVENTION
The objective of the present invention is to offer the same functions with less electronic circuitry.
A first approach toward the accomplishment of this goal is the insight, that an implicit coding is already done by the alignment of the addressable units along the cable, as one can unambiguously attribute an individual cable length between the cell and the cable terminal processor, to each cell. This insight constitutes the starting point for the invention as described in claims.
As set forth in claims, all the units are now addressable by a standardized signal. The coding of the individual unit's address is accomplished by the cable length, and one address follows automatically after the previous one, and, in consequence, there is no more need for special address encoding. Even when the decoding is considered, the device is greatly simplified, since all the address detectors of the addressable units are now identical which makes them simpler to produce and cheaper.
When the various addressable units are selected, information may be trasmitted via the data wire either from the addressable unit towards the cable terminal processor, as described in the above-mentioned papers, or information may be directed to the various addressable units. One may, for example, transmit a current signal, the value of which is proportional to the information one wants to transmit. When measurement is concerned, one considers the sensing of physical information at the location of the addressable unit and its transmission to the cable terminal processor. In the general case of information gathering, information that is present at the location of the addressable unit is transmitted to the cable terminal processor. The way how the information gathering process is accomplished, either by sensing or by measurement, is arbitrary and of no importance for the present invention. As we will consider the example of temperature sensing in the following text, this constitutes in no way a constraint to the present invention.
Furthermore it may prove advantageous to transmit information that is present in analog or digital format by modulation of a high frequency carrier signal.
The standardized signals need no smooth parameters; it may be advantageous to build the address generator in order to improve the addressing precision and the addressing security. This provides a means to address the next and only the next active addressable unit.
As set forth in the claims a means to provide for better security, as errors may be prevented. Furthermore the reset circuitry provides the transition of all addressable units 14 to their standard configuration which is their starting position for the beginning of an addressing cycle.
A means to address succeeding addressable units when their separation in terms of the impedance of the cable length between them would otherwise be insufficient to sufficiently attenuate the parameter of the standardized signal, that is used to recognize the addressing, between the first unit 14 with closed switching means 8, that follows the cable terminal processor
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An Meng-Ai T.
Coyne Patrick J.
Lee Thomas C.
Massaroni Kenneth M.
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