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Class Information
Number: 380/31
Name: Cryptography > Communication system using cryptography > Wireless communication > Plural modulation of single carrier
Description: Subject matter which modulates a carrier with more than one signal or varies more than one signal parameter.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7512237 |
Encryption for optical communications using dynamic subcarrier multiplexing |
Mar. 31, 2009 |
| 7421075 |
Wireless online cryptographic key generation method |
Sep. 2, 2008 |
| 7415043 |
Code division multiple access (CDMA) method and apparatus for protecting and authenticating wirelessly transmitted digital information |
Aug. 19, 2008 |
| 7356141 |
Baud rate modulation encoding/decoding method and device for remote controller |
Apr. 8, 2008 |
| 7333614 |
System and method for encypting spread spectrum carrier |
Feb. 19, 2008 |
| 7308104 |
Forward multiple scrambling code generating method and apparatus |
Dec. 11, 2007 |
| 7228131 |
IPv6/IPv4 tunneling method |
Jun. 5, 2007 |
| 6980657 |
Communications system using chaotic synchronized circuits |
Dec. 27, 2005 |
| 6683958 |
Apparatus and method for embedding and extracting information in analog signals using distributed signal features and replica modulation |
Jan. 27, 2004 |
| 6427012 |
Apparatus and method for embedding and extracting information in analog signals using replica modulation |
Jul. 30, 2002 |
| 6389138 |
Method and apparatus for generating a complex scrambling code sequence |
May. 14, 2002 |
| 6363325 |
Automotive emergency awareness system |
Mar. 26, 2002 |
| 6249583 |
On-line signal processing method |
Jun. 19, 2001 |
| 6229897 |
Apparatus and method of secured analog voice communication |
May. 8, 2001 |
| 5864625 |
Methods and apparatus for secure optical communications links |
Jan. 26, 1999 |
| 5790591 |
Spread spectrum transmitter and communications system using multiple spreading codes |
Aug. 4, 1998 |
| 5642397 |
Paging system which combines a paging signal with a standard broadcast baseband signal |
Jun. 24, 1997 |
| 5471531 |
Method and apparatus for low cost audio scrambling and descrambling |
Nov. 28, 1995 |
| 5379345 |
Method and apparatus for the processing of encoded data in conjunction with an audio broadcast |
Jan. 3, 1995 |
| 5305384 |
Apparatus, system and method for transmitting secure signals over narrow spaced channels |
Apr. 19, 1994 |
| 5268926 |
Method and apparatus for the simultaneous transmission of separate data signals |
Dec. 7, 1993 |
| 5258996 |
Spread spectrum apparatus |
Nov. 2, 1993 |
| 5228055 |
Spread spectrum communication device |
Jul. 13, 1993 |
| 4972479 |
Method and apparatus for providing privacy/security in a communication system |
Nov. 20, 1990 |
| 4908860 |
System for the secret transmission of audio signals and television receiver for receiving such signals |
Mar. 13, 1990 |
| 4841571 |
Privacy signal transmission system |
Jun. 20, 1989 |
| 4799257 |
Wireless transmission system for PM modulation signal |
Jan. 17, 1989 |
| 4658436 |
Disguised transmission system and method |
Apr. 14, 1987 |
| 4652838 |
Phase randomization to reduce detectability of phase or frequency-modulated digital signals |
Mar. 24, 1987 |
| 4653069 |
Spread spectrum correlation receiver |
Mar. 24, 1987 |
| 4652699 |
Voice scrambler using frequency-inversion and band-splitting technique |
Mar. 24, 1987 |
| 4538281 |
Adaptive acquisition of multiple access codes |
Aug. 27, 1985 |
| 4516078 |
Variable frequency passband circuit |
May. 7, 1985 |
| 4411017 |
Secure mobile telephone system |
Oct. 18, 1983 |
| 4410911 |
Multiple signal transmission method and system, particularly for television |
Oct. 18, 1983 |
| 4398216 |
Multiple signal transmission method and system, particularly for television |
Aug. 9, 1983 |
| 4398214 |
Wired television broadcasting system |
Aug. 9, 1983 |
| 4365110 |
Multiple-destinational cryptosystem for broadcast networks |
Dec. 21, 1982 |
| 4358857 |
Communication system |
Nov. 9, 1982 |
| 4245346 |
Communication system |
Jan. 13, 1981 |
| 4206462 |
Secure communication and ranging system |
Jun. 3, 1980 |
| 4052565 |
Walsh function signal scrambler |
Oct. 4, 1977 |
| 3970791 |
Voice controlled disappearing audio delay line |
Jul. 20, 1976 |
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