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| Number | Title | Issue Date |
| 7844053 | Microprocessor apparatus and method for performing block cipher cryptographic functions A microprocessor apparatus is provided, for performing a cryptographic operation. The microprocessor apparatus includes an x86-compatible microprocessor that has fetch logic, a cryptography unit, and an integer unit. The fetch logic is configured to fetch an applica... | 11/30/2010 |
| 7391867 | Graphical display of QKD system statistics Systems and methods for graphically displaying statistical information relating to the operation of a quantum key distribution (QKD) system. The method includes exchanging quantum photons between first and second QKD stations for each combination of modulator states... | 06/24/2008 |
| 7379878 | Information encoding apparatus and method, information decoding apparatus and method, recording medium utilizing spectral switching for embedding additional information in an audio signal An information encoding apparatus and method, an information decoding apparatus and method, a recording medium, and a program make it possible to embed information without causing an increase in the amount of data of compressed audio signals. A spectrum measurer con... | 05/27/2008 |
| 7333608 | Analog scrambler An analog signal scrambler/de-scrambler includes a receiver for receiving an analog signal and converting the signal into an intermediate frequency signal. A generator generates a pseudo-random gaussian frequency distribution signal, which is multiplied with the int... | 02/19/2008 |
| 7319756 | Audio coding Coding of an audio signal (x) is provided where the coded bitstream (AS) comprises a parametric representation of the audio signal. One component of the parametric representation comprises tracks of linked sinusoidal components (CS) where subsequently linked compone... | 01/15/2008 |
| 7298840 | Method and system for data integrity protection A method of authenticating a message (111) received via a transmission channel (108) using a Message Authentication Code (MAC). The message comprises a message body (114) and a tag (116) and the method comprises the steps of generating a ... | 11/20/2007 |
| 7219082 | Financial management system A financial transaction network includes a customer network serviced by a host processor. The financial transaction network provides customers with a plurality of diverse and interchangeable financial products and financial services that customers may utilize to dir... | 05/15/2007 |
| 7158577 | Communication system At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point g... | 01/02/2007 |
| 7146149 | High isolation switch buffer for frequency hopping radios A local oscillator (LO) circuit is disclosed which provides improved isolation between the unselected LO source and a mixer. The LO circuit includes a first LO source to generate a first periodic signal cycling at a first frequency, a second LO source to generate a ... | 12/05/2006 |
| 7139547 | Integrated direct conversion satellite tuner A direct conversion satellite tuner is fully integrated on a common substrate. The integrated tuner receives an RF signal having a plurality of channels and down-converts a selected channel directly to baseband for further processing. The integrated tuner includes o... | 11/21/2006 |
| 7076659 | Enhanced method for digital data hiding A method is provided for enhanced spread spectrum watermarking. The improved watermarking method includes: receiving host data which is expressed in a transform domain by a plurality of host transform parameters; reducing variance between the plurality of host trans... | 07/11/2006 |
| 7053697 | System for tuning a corner frequency of a low pass filter An integrated circuit formed on a semiconductor chip, comprising a low pass filter circuit having a first resistor of a first resistance value and a capacitor of a first capacitance value, wherein the first resistance value and the first capacitance value determine ... | 05/30/2006 |
| 7051203 | Data watermarks created by using an uneven sampling period Input signals are electronically watermarked using an uneven or non-uniform sampling rate. The uneven or non-uniform sampling may be pseudo-random. The uneven or non-uniform sampling meets the Nyquist criterion so that aliasing and loss of content are avoided. The r... | 05/23/2006 |
| 7042959 | DSP-based variable aperture code generation technique Variable Aperture Coded (VAC) signals for VAC modulation are advantageously generated by a digital signal processor (12) that yields a VAC signal having a single narrow peak in the positive frequency region. A Discrete-Time Hilbert transformer (12) iso... | 05/09/2006 |
| 7039371 | Transmitting device limiting the out-of-band interferences The invention relates to a transmitting device limiting the out-of-band interferences. The modulation is done with or without inversion of the spectrum. Next, frequency transposition is done in supradyne or infradyne fashion such that the parasitic effects originati... | 05/02/2006 |
| 7035320 | Communication apparatus, frequency spectrum inversion method and program storage medium Signals with transmission frequencies from hand sets are received by a receiver. The whole frequency spectrum including the received signals whose frequency is converted by the receivers inverted by a signal processor. Then, the received signals included in the freq... | 04/25/2006 |
| 6993153 | Self-orienting watermarks A watermarking method converts a watermark message into a Frequency Shift Keying (FSK) signal and embeds the FSK signal in a host signal. The spectral properties of the FSK watermark signal facilitate its detection, even in applications where the watermarked signal ... | 01/31/2006 |
| 6973188 | Analog scrambler A method for scrambling/descrambling an analog signal includes receiving an analog signal and converting the signal into an intermediate frequency signal. A Gaussian pseudo-random noise signal is generated and then multiplied with the intermediate frequency signal t... | 12/06/2005 |
| 6973190 | Method for protecting an electronic system with modular exponentiation-based cryptography against attacks by physical analysis The invention concerns a method for protecting an electronic system implementing a cryptographic calculation process involving a modular exponentiation of a quantity (x), said modular exponentiation using a secret exponent (d), characterized in that said secret expo... | 12/06/2005 |
| 6972620 | Post amplifier array integrated circuit An optical communication system that includes a multi-channel post amplifier assembly with flexible output configurations for amplifying optical-to-electrical converted signals on selectable groups of amplifier channels is provided. The post amplifier assembly, when... | 12/06/2005 |
| 6970843 | Financial management system A financial transaction network includes a customer network serviced by a host processor. The financial transaction network provides customers with a plurality of diverse and interchangeable financial products and financial services that customers may utilize to dir... | 11/29/2005 |
| 6823455 | Method for robust watermarking of content One inventive aspect pertains to a watermarking mechanism that allows a watermark to be determined from only a part of the video sequence without human intervention and without reference to the original watermarked frames. This watermark has improved invisibility, d... | 11/23/2004 |
| 6731757 | Multichannel digital signal generation method and apparatus A method of and apparatus for digitally generating a broadband signal comprising a plurality of CW or quadrature modulated signals having incrementally related frequencies wherein said plurality of signals are centered about a center RF frequency is disclosed. The i... | 05/04/2004 |
| 6625297 | Self-orienting watermarks A watermarking method converts a watermark message into a Frequency Shift Keying (FSK) signal and embeds the FSK signal in a host signal. The spectral properties of the FSK watermark signal facilitate its detection, even in applications where the watermar... | 09/23/2003 |
| 6501841 | Method for providing security for a transmission of information through a plurality of frequency orthogonal subchannels One embodiment of the present invention is a method for providing security for a transmission of information in an ADSL environment using a DMT modulation technique. The order of the frequency orthogonal subchannels used in the DMT technique is scrambled ... | 12/31/2002 |
| 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 |
| 6345100 | Robust watermark method and apparatus for digital signals Watermark data is encoded in a digitized signal by forming a noise threshold spectrum which represents a maximum amount of imperceptible noise, spread-spectrum chipping the noise threshold spectrum with a relatively endless stream of pseudo-random bits to... | 02/05/2002 |
| 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 |
| 6078668 | Apparatus and method for concealing data bursts in an analog scrambler using audio repetition An apparatus and method for concealing data bursts in an analog scrambler using audio repetition. What otherwise would be periodic data bursts appearing at the audio output are replaced with samples from audio portions of the multiplexed signal. Preferabl... | 06/20/2000 |
| 5796838 | Method and apparatus for performing frequency spectrum inversion An apparatus and method for creating voice privacy by performing frequency spectrum inversion in electronic voice transmission systems includes the steps of digitizing an analog signal and inverting the frequency spectrum of the digitized audio signal. Fr... | 08/18/1998 |
| 5768374 | Apparatus and method for continuous scrambling while transmitting or receiving synchronization data An apparatus and device for continuously scrambling audio while transmitting or receiving synchronization data. When transmitting, synchronization data will be substituted for scrambled audio but the audio scrambling will continue during those time period... | 06/16/1998 |
| 5757921 | Radio communication apparatus having common oscillator applied for PLL, conversion and scramble/descramble circuits A superheterodyne receiving circuit and a superheterodyne transmitting circuit are provided. A PLL forms a local oscillation signal in the receiving circuit, and a PLL forms a carrier signal in the signal transmitting circuit. A circuit converts digital d... | 05/26/1998 |
| 5671284 | Data encryptor having a scalable clock A method for encrypting and decrypting digital data. The digital data is initially latched by an input register. Sixteen separate cipher stages cascaded in series are used to encrypt the digital data. These cipher stages are operating at a maximum frequen... | 09/23/1997 |
| 5528692 | Frequency inversion scrambler with integrated high-pass filter having autozero to remove internal DC offset A frequency inversion scrambler in a cordless telephone utilizes an integrated high-pass filter (14) between a first stage low-pass filter (12) and modulator (16) to reduce the filter order while maintaining low group delay in the audio signal. The first ... | 06/18/1996 |
| 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 |
| 5400404 | Modulation/demodulation circuit and communication system utilizing the same The present invention provides a modulation/ demodulation circuit and a communication system utilizing the modulation/demodulation circuit. The modulation/ demodulation circuit can be operated in either of a modulation/demodulation mode wherein an input s... | 03/21/1995 |
| 5392354 | Cordless phone system capable of scrambling communication signals A cordless phone system includes a first cordless phone and a second cordless phone which are coupled to each other by a network, the first cordless phone being formed of a first personal station and a first base station, the second cordless phone being f... | 02/21/1995 |
| 5377223 | Notch filtering a spread spectrum signal using fourier series coefficients A transmitter and receiver for spread spectrum communications using a Fourier series coefficients module, a notch gate, a fast Fourier transform module, and memory. The Fourier series coefficient module generates magnitude and phase values of a Fourier se... | 12/27/1994 |
| 5335279 | Digital voice-band spectrum inversion apparatus A digital speech-band spectrum inversion apparatus for use in a cordless telephone system provides transmission security of the voice signal between the handset (10) and the base station (18). The apparatus includes an A/D converter (24) for converting an... | 08/02/1994 |
| 5168522 | Wireless telephone with frequency inversion scrambling The wireless telephone of the present invention is comprised of a base unit, coupled to a land-line telephone system, and a remote unit that communicates with the base unit over radio frequencies. The remote unit has scrambling circuits (207 and 216) for ... | 12/01/1992 |
