Appeal No. 2006-3182
Application No. 09/883,963
compares the reply security code with the codes stored in registers 100 and 102.
That reply signal includes a function code which is clocked into the
microcomputer 80 and stored in the function code register 108. The function code
now received as part of the reply signal requests that the vehicle door be
unlocked. Thus, when an operator carrying transceiver A enters the range of the
interrogation signal transmitted by transceiver C, the doors of the vehicle
automatically unlock.
2. At column 7, lines 38 through 45, Bates states the following:
More particularly, incoming spread spectrum received by the device 32 or
interrogator 47 are demodulated through cross correlation with a version of the
pseudo random carrier that is generated by the device 32 itself or the interrogator
47 itself, respectfully. Cross correlation with the correct PN sequence unspreads
the spread spectrum signal and restores the modulated message in the same
narrow band as the original data.
3. At column 7, lines 51 through 65, Bates states the following:
A pseudo-noise sequence has many characteristics that are similar to those of
random binary sequences. For example, a pseudo-noise sequence has a nearly
equal number of zeros and ones, very low correlation between shifted versions of
the sequence, and very low cross correlation between any two sequences. A
pseudo-noise sequence is usually generated using sequential logic circuits. For
example, a pseudo-noise sequence can be generated using a feedback shift
register.
A feedback shift register comprises consecutive stages of two state memory
devices, and feedback logic. Binary sequences are shifted through the shift
registers in response to clock pulses, and the output of the various stages are
logically combined and fed back as the input to the first stage.
With the above discussion in mind, we find that the combination of Lambropoulos, Bates
and Ziemer would have not led the ordinarily skilled artisan to the claimed invention.
Particularly, Lambropoulos teaches a transceiver located at a vehicle for transmitting an
9
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 Next
Last modified: November 3, 2007