Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
56 words
An active device comprising a memory (31) for storing and supplying coded information and a transmitter (24) arranged to transmit an output signal including said coded information, characterised in that the device also comprises data means (161; 162;BO-B7) for supplying further information independently of the memory,and that the transmitter output signal also includes said further information.
Claim 2
Dependent Claim
56 words
An active device comprising a memory (31) for storing and supplying coded information and a transmitter (24) arranged to transmit an output signal including said coded information, characterised in that the device also comprises data means (161; 162;BO-B7) for supplying further information independently of the memory,and that the transmitter output signal also includes said further information.
Claim 3
Dependent Claim
39 words
An active device according to claim 1, wherein the outputs of the memory and the data means are connected to corresponding inputs of data selector means, (32;163) the input of the transmitter being connected to the data selector means.
Claim 4
Dependent Claim
40 words
An active device according to claim 1 or 2, said data means comprising one or more input connections (Bo-B7) connected to means for providing signals representing the updated values of one or more parameters, said values constituting said further information.
Claim 5
Dependent Claim
89 words
An active device according to claim 2 and 3 wherein said input connections are connected to respective inputs of said data selector means (32) via respective further data selector means, (310 - 317) said further data selector means also being connected to respective outputs (DO - D7) of the memory, and select input means (319) being provided for said further data selector means whereby said inputs of said first mentioned data selector means (32) receive information either from said input connections or from said respective outputs of the memory.
Claim 6
Dependent Claim
21 words
An active device according to any preceding claim comprising a battery, wherein said further information relates to the battery voltage level.
Claim 7
Dependent Claim
42 words
An active device according to claim 5 comprising means (161) for detecting that the battery voltage has fallen below a predetermined level and altering a part of said further information in said output signal, the remainder of said output signal remaining unaltered.
Claim 8
Dependent Claim
38 words
An active device according to claim 5 comprising means (162) for detecting that the battery voltage has fallen below a predetermined level and means, (163) connected to said detecting means, for preventing said coded information reaching the transmitter.
Claim 9
Dependent Claim
54 words
An active device according to any of claims 5 to 7 comprising first means (161) for detecting that the battery voltage has fallen below a first predetermined level and second means (162) for detecting that the battery voltage has fallen below a second predetermined level, said second level being lower than said first level.
Claim 10
Dependent Claim
93 words
An active device according to any preceding claim comprising signal input means (41) and a memory protection cicuit (410) for preventing undesired changing of the coded information stored in the memory wherein when it is desired to change the stored information a predetermined series of pulses must be applied via the signal input means to the memory protection circuit and wherein the memory protection circuit includes means for comparing both the number and the timing of pulses actually applied to the input means with the number and the timing of the predetermined series.
Claim 11
Dependent Claim
20 words
An active device according to any preceding claim comprising frequency division circuitry, (134) the division ratio of which is adjustable.
Claim 12
Dependent Claim
52 words
An active device according to any preceding claim comprising a first circuit for supplying regular pulse trains and a second circuit for supplying spaced pulses, the first and second circuits having a single input (21) for receiving modulated signals, and the second circuit being connected to the input via a demodulator (250).
Claim 13
Dependent Claim
196 words
A coded information detecting system comprising: (i) a plurality of active devices according to any preceding claim, each comprising a receiver, and a transmitter for transmitting in response to an input signal received by the receiver an output signal including said coded information and said further information, (ii) an interrogator unit (210) which is arranged to provide said input signal and detect said output signal, and which includes decoding means, (223) and (iii) a polling unit (211) which is arranged to supply said input signal from said interrogator unit successively to each one of a plurality of aerial units (231 - 234) at separate sites, and to return any received output signal from a transponder to the interrogator unit, wherein the decoding means includes means for detecting whether an initial transponder output signal is received from an aerial unit and means responsive to said detecting means which, in the presence of a transponder output signal, allows the polling unit to supply the coded information from the memory of the transponder to the interrogator unit and which, in the absence of a transponder output signal, instructs the polling unit to skip immediately to the next aerial unit.