EP0148458A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Address encoding system for portable battery - operated devices
Assignee: Motorola Solutions Inc
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Filing: 1984-12-16
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Granted: —
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Expires: 2004-12-16
Abstract
Abstract A two-way radio communications system includes a battery-operated portable unit (12) and a base unit (11) having a receptacle (17) for receiving the portable unit when the portable unit is not in use. A security circuit (51, 52) in each unit allows communication with other units only upon the reception of an address code corresponding to an address code stored in the unit. When the portable unit is seated in the base unit receptacle, the batteries (38) of the portable unit are recharged by current supplied by the base unit. At the same time, the address code of the base unit is entered into the portable unit by encoding circuitry (55, 58, 62, 54) which modulates the battery charging current in accordance with the address code. Circuitry (44) within the portable unit demodulates the charging current to recover the address code for storage in the security circuit of the portable unit. The invention can also be used in systems where data other than address codes must be sent to a unit being charged.
Inventors
- 👤 Daniel R. Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 17:22
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/727
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
An encoding system for use in electronic systems of the type having a base station unit and one or more battery operated portable units in which the base station unit provides a charging current for charging the battery of the portable unit and in which a code stored in the base station unit is compared with a code stored in the portable unit, comprising: means associated with the base station unit for modulating the charging current, said modulation being in accordance with the code stored in the base station unit whereby said code is carried on said modulated charging current; and means associated with the portable unit for demodulating the modulated charging current to retrieve the code information contained thereon for storage within the portable unit.
Claim 2
Dependent Claim
126 words
An encoding system for use in electronic systems of the type having a base station unit and one or more battery operated portable units in which the base station unit provides a charging current for charging the battery of the portable unit and in which a code stored in the base station unit is compared with a code stored in the portable unit, comprising: means associated with the base station unit for modulating the charging current, said modulation being in accordance with the code stored in the base station unit whereby said code is carried on said modulated charging current; and means associated with the portable unit for demodulating the modulated charging current to retrieve the code information contained thereon for storage within the portable unit.
Claim 3
Dependent Claim
43 words
An encoding system as defined in claim 1 wherein said encoding system further includes sensing means for sensing the flow of charging current, said sensing means providing an enable signal in response to the flow of charging current for enabling said modulating means.
Claim 4
Dependent Claim
41 words
An encoding system as defined in claim 2 wherein said modulating means are enabled only when said enable signal provided by said sensing means is produced, whereby said encoding system allows modulation of charging current only when charging current is flowing.
Claim 5
Dependent Claim
26 words
An encoding system_as defined in claim 3 wherein said modulating means periodically interrupt the charging current in accordance with the code stored in the base unit.
Claim 6
Independent Claim
115 words
A method for encoding an encodable battery-operated portable unit used in an electronic system of the type having a base station unit and one or more battery-operated portable units In which a code stored in the base station unit is compared with a code stored in the encoded portable unit, said method comprising the steps of: applying the charge current provided by the base station unit to the encodable portable unit; modulating the charge current in accordance with the code stored in the base station whereby the code is carried on the modulated charge current; demodulating the charge current to retrieve the code transmitted thereon; and storing the retrieved code within the encodable portable unit.
Claim 7
Independent Claim
115 words
A method for encoding an encodable battery-operated portable unit used in an electronic system of the type having a base station unit and one or more battery-operated portable units In which a code stored in the base station unit is compared with a code stored in the encoded portable unit, said method comprising the steps of: applying the charge current provided by the base station unit to the encodable portable unit; modulating the charge current in accordance with the code stored in the base station whereby the code is carried on the modulated charge current; demodulating the charge current to retrieve the code transmitted thereon; and storing the retrieved code within the encodable portable unit.
Claim 8
Dependent Claim
31 words
A method as defined in claim 5 wherein the charge current is modulated by means of periodically interrupting the charge current in accordance with the code stored in the base station.
Claim 9
Dependent Claim
43 words
A method as defined in claim 6 wherein the method further comprises the step of sensing the passage of charging current to the portable unit and allowing said modulation of the charging current only when charging current is passing to the portable unit.
Claim 10
Dependent Claim
148 words
A method as defined in claim 7 wherein the method further comprises the steps of: converting the code stored in the base station unit to form a word, said word comprising a series of logic bits, each of said logic bits being in one or the other of two states whereby each unique code stored in the base station unit results in the formation of a unique series of logic bits; and modulating the charge current in accordance with said word thus formed, said modulation comprising applying charge current in response to each bit of one state of said two states and interrupting the charge current in response to each bit of the other state of said two states whereby each unique code stored in the base station unit results in a unique sequence of application and interruption of the charge current provided by the base station unit.
Claim 11
Dependent Claim
29 words
A method as defined in claim 8 wherein said word further includes a series of synchronization logic bits for signaling the beginning or end of said word thus formed.
References Cited (Backward Citations)
No citation records indexed.
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