Patent US5222141A successfully refreshed from Google Patents.
US5222141A
Expired / Lapsed
US
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Apparatus and method for encoding data
Assignee: Motorola Mobility LLC
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Filing: 1992-03-25
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Granted: 1993-06-22
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Expires: 2012-03-25
Abstract
Abstract A first bit of the communication signal is encrypted and forwarded to a CRC where it is processed in parallel with the encryption of the second bit. The first bit is then passed to the scrambler and the second bit is passed to the CRC where they are processed in parallel with a third bit which is encrypted. This process continues until the last bit is scrambled.
Inventors
- 👤 Maverick M. Killian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:28
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/06; H04L9/065; H04L2209/00; H04L2209/12; H04L2209/125; H04L2209/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
A method of encoding a communication signal having a plurality of bits, said method comprising the steps of: encrypting a first bit of a data block of said communication signal; cyclically redundancy checking said first bit while encrypting a second bit of said data block of said communication signal; and scrambling said first bit and cyclically redundancy checking said second bit while encrypting a third bit of said data block of said communication signal.
Claim 2
Independent Claim
74 words
A method of encoding a communication signal having a plurality of bits, said method comprising the steps of: encrypting a first bit of a data block of said communication signal; cyclically redundancy checking said first bit while encrypting a second bit of said data block of said communication signal; and scrambling said first bit and cyclically redundancy checking said second bit while encrypting a third bit of said data block of said communication signal.
Claim 3
Dependent Claim
72 words
The method of claim 1 further comprising the steps of: scrambling a third to last bit of said data block of said communication signal and cyclically redundancy checking a next to last bit of said data block of said communication signal while encrypting a last bit of said data block of said communication signal; scrambling said next to last bit while cyclically redundancy checking said last bit; and scrambling said last bit.
Claim 4
Independent Claim
273 words
An apparatus for encoding a communication signal comprising: encrypting means for encrypting said communication signal, said encrypting means comprising: a first register having a data input coupled to receive said communication signal and a clock input coupled to receive a clock signal; an encrypting device having an input coupled to an output of said first register; a first multiplexer having a first input coupled to said output of said first register, and a second input coupled to an output of said encrypting device; cyclic redundancy checking (CRC) means for calculating a cyclic redundancy value of said communication signal, said CRC means comprising; a second register having a data input coupled to receive an output from said encrypting means and a clock input coupled to receive said clock signal; an cyclic redundancy checker having an input coupled to an output of said second register; a second multiplexer having a first input coupled to said output of said second register, and a second input coupled to an output of said cyclic redundancy checker; scrambling means for scrambling said communication signal, said scrambler comprising; a third register having a data input coupled to receive an output from said cyclic redundancy checking means and a clock input coupled to receive said clock signal; an scrambler having an input coupled to an output of said third register; a third multiplexer having a first input coupled to said output of said third register, and a second input coupled to an output of said scrambler; and a fourth register having an input coupled to receive an output of said scrambling means and an output coupled to provide an encoded signal.
Claim 5
Independent Claim
273 words
An apparatus for encoding a communication signal comprising: encrypting means for encrypting said communication signal, said encrypting means comprising: a first register having a data input coupled to receive said communication signal and a clock input coupled to receive a clock signal; an encrypting device having an input coupled to an output of said first register; a first multiplexer having a first input coupled to said output of said first register, and a second input coupled to an output of said encrypting device; cyclic redundancy checking (CRC) means for calculating a cyclic redundancy value of said communication signal, said CRC means comprising; a second register having a data input coupled to receive an output from said encrypting means and a clock input coupled to receive said clock signal; an cyclic redundancy checker having an input coupled to an output of said second register; a second multiplexer having a first input coupled to said output of said second register, and a second input coupled to an output of said cyclic redundancy checker; scrambling means for scrambling said communication signal, said scrambler comprising; a third register having a data input coupled to receive an output from said cyclic redundancy checking means and a clock input coupled to receive said clock signal; an scrambler having an input coupled to an output of said third register; a third multiplexer having a first input coupled to said output of said third register, and a second input coupled to an output of said scrambler; and a fourth register having an input coupled to receive an output of said scrambling means and an output coupled to provide an encoded signal.
Claim 6
Dependent Claim
33 words
The apparatus of claim 3 wherein said encrypting device further comprises a key input for receiving a key code and a load input for directing said encrypting device to load said key code.
Claim 7
Dependent Claim
21 words
The apparatus of claim 3 wherein said cyclic redundancy checker further comprises a load input to reset said cyclic redundancy checker.
Claim 8
Dependent Claim
31 words
The apparatus of claim 3 wherein said scrambler further comprises an initialization input for receiving an initialization code and a load input for directing said scrambler to load said initialization code.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-21 | 1996-12-21 | 1997-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-21 | 2000-12-21 | 2001-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-21 | 2004-12-21 | 2005-06-22 | $7700.00 | Window Closed / Lapsed |