Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7421075 | Wireless online cryptographic key generation method A system and method for wireless cryptographic key exchange among participants in a wireless computing network is presented. This allows the authorized participants in the wireless communication session not have the same key before the wireless computing session beg... | 09/02/2008 |
| 7415043 | Code division multiple access (CDMA) method and apparatus for protecting and authenticating wirelessly transmitted digital information A spread spectrum method and apparatus for protecting and authenticating wirelessly transmitted digital information using numerous techniques. The apparatus may be a wireless code division multiple access (CDMA) communication system, a base station, a wireless trans... | 08/19/2008 |
| 7356141 | Baud rate modulation encoding/decoding method and device for remote controller A encoding/decoding method and device for a remote controller utilizing a baud rate to encrypt data for transmission. The encoding device includes an encoder encoding an identification code into an encrypted code; and an interpreter interpreting the un-encoded porti... | 04/08/2008 |
| 7352862 | Encryption method, communication system, transmission device, and data input device An encryption method includes the steps of (a) generating random data including a first part and a second part, the first part specifying an operation to be performed on plain text data and the second part being used in the operation, (b) performing the specified op... | 04/01/2008 |
| 7333614 | System and method for encypting spread spectrum carrier A system and method for encrypting all channels of a wireless spread spectrum communication at the chip level. The PN sequence is encrypted with one or more encryption sequences and then used to spread the signal. ... | 02/19/2008 |
| 7330661 | Method and apparatus for optical communication between devices A method and apparatus for processing a data signal for transmission to a remote device transmits at least two synchronized copies of the data signal, in optical form, in different directions. To that end, the data signal first is synchronized to a clock signal to p... | 02/12/2008 |
| 7308104 | Forward multiple scrambling code generating method and apparatus Disclosed are a forward multiple scrambling code generating method and apparatus in a communication system. Each base station uses primary scrambling codes and an associated one of secondary scrambling code sets, each consisting of a plurality of secondary scramblin... | 12/11/2007 |
| 7228131 | IPv6/IPv4 tunneling method A mobile host MH and its home network HN correspond to both the Internet Protocol version 4 (IPv4) and the Internet Protocol version 6 (IPv6). An authentication server (RS) is accommodated in the home network HN. A corresponding host H corresponds to the IPv6 and is... | 06/05/2007 |
| 7200338 | Method and system for communicating a clock signal over an optical link A method and system for communicating a clock signal over an optical link includes receiving a multimodulated optical information signal including non-intensity modulation for a data signal and intensity modulation for a clock signal. The clock signal is recovered b... | 04/03/2007 |
| 7170996 | Random number generation for encrypting cellular communications In wireless communications, transmission devices require continuous supplies of random data for encryption processes. The invention provides a method for generating a continuos pool of truly random data with hardware that is already available in conventional CDMA ph... | 01/30/2007 |
| 7146553 | Error correction improvement for concatenated codes An enhanced forward error correction system is disclosed. Transmitted data is encoded into codewords in multiple dimensions. The decoding of received data by a decoder is performed in multiple passes in each dimension, with corrected data provided as an output from ... | 12/05/2006 |
| 7142819 | Circuits and methods for controlling switching noise in switched-mode circuits A method of controlling noise in a pulse width modulation circuit includes varying a sample frequency and a range of information levels, wherein each sample within a data sample stream at the sample frequency represents a level within the range of information levels... | 11/28/2006 |
| 7130354 | Method and apparatus for improving error control properties for encoding and decoding data A method, and apparatus implementing the method, encodes bits to be transmitted over a channel. The channel may be a single carrier or a multi-carrier channel. Bits are encoded based on a constellation that has a self-similarity property and also has an improved bit... | 10/31/2006 |
| 7099292 | Spread spectrum communications using a reference and a message signal system and method A spread spectrum remote unit produces a message signal having message data. A reference signal is produced. The reference signal is used to recover the message data from a combined spread spectrum signal. The reference signal and the message signal is combined as a... | 08/29/2006 |
| 7079780 | Linearized optical link using a single Mach-Zehnder modulator and two optical carriers An improved analog optical system which provides improved dynamic range as well as sensitivity relative to known analog optical systems. The analog optical system includes a Mach-Zehnder modulator (MZM) operated with a low bias to improve sensitivity. In accordance ... | 07/18/2006 |
| 7058006 | OFDM communication apparatus Synchronization symbol insertion section 102 inserts a synchronization symbol into a signal digital-modulated by modulation section 101. 0 symbol insertion section 103 inserts a 0 symbol into the signal with the synchronization symbol inserted. ... | 06/06/2006 |
| 7020114 | Spread spectrum communication system and method using a reference signal and a plurality of message signals A spread spectrum communication system produces a reference signal. A plurality of message signals are produced. Each message signal has message data. The reference signal and the plurality of message signals are combined as a combined spread spectrum signal. The co... | 03/28/2006 |
| 7010022 | Spread spectrum receiver The spread spectrum receiver employs circuits based on direct conversion techniques. These circuits enable realization of spread spectrum receivers of greatly reduced complexity and of much higher chip rates that can be implemented with the standard approach of a fu... | 03/07/2006 |
| 6980657 | Communications system using chaotic synchronized circuits A chaotic communication system employs transmitting and receiving chaotic oscillating circuits. In an embodiment of the invention employing a Chua circuit as the basic chaotic circuit, the transmitter has a tank circuit portion and a Chua diode portion linked throug... | 12/27/2005 |
| 6978131 | Testing mobile phones An apparatus for testing a cellular phone comprising an RF signal generator (122) for transmitting an RF signal (RF10) to said cellular phone, said RF signal generator receiving an input digital signal (DSIG10) which determines the characteristi... | 12/20/2005 |
| 6959386 | Hiding encrypted messages in information carriers An identification code signal is hidden in a carrier signal (such as an electronic data signal or a physical medium) in a manner that permits the identification signal later to be discerned. The carrier signal can thereby be identified, or some machine responsive ac... | 10/25/2005 |
| 6937643 | ROM-based PN generation for wireless communication A device includes a request arbitration unit that (1) receives a number of requests for PN vectors from a number of processing units and (2) provides a control indicative of each request selected for processing. An address generator provides one or more addresses (w... | 08/30/2005 |
| 6925071 | Spread spectrum base station A spread spectrum remote unit produces a message signal having message data. A reference signal is produced. The reference signal is used to recover the message data from a combined spread spectrum signal. The reference signal and the message signal is combined as a... | 08/02/2005 |
| 6917601 | Spread spectrum remote unit A spread spectrum remote unit produces a message signal having message data. A reference signal is produced. The reference signal is used to recover the message data from a combined spread spectrum signal. The reference signal and the message signal is combined as a... | 07/12/2005 |
| 6683958 | Apparatus and method for embedding and extracting information in analog signals using distributed signal features and replica modulation Apparatus and methods are provided for embedding or embedding digital data into an analog host or cover signal. A distributed signal feature of the cover signal in a particular domain (time, frequency or space) is calculated and compared with a set of pre... | 01/27/2004 |
| 6427012 | Apparatus and method for embedding and extracting information in analog signals using replica modulation Apparatus and methods are provided for embedding or encoding auxiliary signals into an analog host or cover signal. A replica of the cover signal or a portion of the cover signal in a particular domain (time, frequency or space) is generated according to ... | 07/30/2002 |
| 6389138 | Method and apparatus for generating a complex scrambling code sequence A complex spreading and/or scrambling code sequence generation system uses a first complex code sequence having at least two components and a second complex code sequence having at least two components. The components of the first complex code sequence ar... | 05/14/2002 |
| 6363325 | Automotive emergency awareness system A vehicular emergency awareness system and method is provided. A vehicle is provided with an onboard computer system adapted to receive and process signals generated at an external source. Under predetermined conditions, the emergency awareness system ale... | 03/26/2002 |
| 6249583 | On-line signal processing method A method for encryption and decryption of analog signal, wherein encryption and decryption are performed in analog domain. The transmitter creating digital representations with unique behavior; producing computation instructions for each digital represent... | 06/19/2001 |
| 6229897 | Apparatus and method of secured analog voice communication An apparatus and method for improved security in wire or wireless communication systems includes scrambling the audio signal, combining a masking signal with the scrambled audio signal, and then transmitting the scrambled masked signal. To recover the ori... | 05/08/2001 |
| 5864625 | Methods and apparatus for secure optical communications links Methods and apparatus for providing a secure optical communications link are disclosed. Communications information is encrypted with a security key. An optical beam is then modulated with both the security key and the encrypted communications information,... | 01/26/1999 |
| 5790591 | Spread spectrum transmitter and communications system using multiple spreading codes A spread spectrum transmitter for generating a plurality of spread spectrum codes comprises a shift register having a plurality of stages, with a plurality of tap sets connected to selected ones of said stages. Each tap set defines a different spread spec... | 08/04/1998 |
| 5642397 | Paging system which combines a paging signal with a standard broadcast baseband signal An electronic paging system and method for transmitting paging signals over a broadcast network, such as a standard pre-existing commercial radio broadcast system, adds paging signals to a normal radio baseband signal for non-interferential co-transmissio... | 06/24/1997 |
| 5471531 | Method and apparatus for low cost audio scrambling and descrambling Audio signals are descrambled by double sideband modulating the scrambled audio signal with a modulation carrier having a carrier frequency slightly above the highest audio signal present in the scrambled audio. This produces a double sideband signal that... | 11/28/1995 |
| 5379345 | Method and apparatus for the processing of encoded data in conjunction with an audio broadcast A method and apparatus for the identification and verification of audio transmission segments, such as may be broadcast by a radio station, consists of the generation of a data stream corresponding in duration to the length of the program segment and incl... | 01/03/1995 |
| 5305384 | Apparatus, system and method for transmitting secure signals over narrow spaced channels An encryption/decryption device, system and method for providing secure communication over a communication channel. The encryption device includes a radio interface unit connected to a conventional radio, wherein the interface unit selectively couples a c... | 04/19/1994 |
| 5268926 | Method and apparatus for the simultaneous transmission of separate data signals A method of simultaneously transmitting first and second data signals by the technique of spectrum spreading by direct sequence, comprises using the first data signal to modulate a spreading code produced by a code generator from a code clock and using th... | 12/07/1993 |
| 5258996 | Spread spectrum apparatus For use in a spread spectrum communication system there is provided in an embodiment of the invention a spread spectrum transmitter which uses a voltage controlled oscillator (VCO) for generating a carrier signal wherein the frequency of the oscillator is... | 11/02/1993 |
| 5228055 | Spread spectrum communication device On the transmitter side of a spread spectrum communication device according to the present invention, transmission date are converted into a plurality of parallel data sets by a serial-parallel convertor and spread-spectrum-modulation is effected by means... | 07/13/1993 |
| 4972479 | Method and apparatus for providing privacy/security in a communication system Apparatus and methods are disclosed for providing privacy on communications systems which include radio links, such as cellular telephone, marine radiotelephone, IMTS, and RDSS systems, in a manner which does not require a scrambler/descrambler at each ca... | 11/20/1990 |
