| 6351222 |
Method and apparatus for receiving an input by an entertainment device |
| Feb-26-2002 |
A method and apparatus for processing acoustic and/or gesture input commands by an entertainment device begins by detecting an acoustic initiation command and/or a gesture initiation command. The initiation... |
| 6330335 |
Audio steganography |
| Dec-11-2001 |
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... |
| 6289108 |
Methods for detecting alteration of audio and images |
| Sep-11-2001 |
The adage "photos don't lie" is no longer reliable. The advent of digital editing tools makes it relatively easy to move, add, or delete features from photographs. Other digital content is similarly susceptible... |
| 6272641 |
Computer network malicious code scanner method and apparatus |
| Aug-7-2001 |
A network scanner for security checking of application programs (e.g. Java applets or Active X controls) received over the Internet or an Intranet has both static (pre-run time) and dynamic (run time)... |
| 6178217 |
Nonlinear digital communications system |
| Jan-23-2001 |
A multiple access communications data and information transport system and methodology for employing the noise present in any conduit as a carrier form using wireless chaotic waveform signals supported... |
| 6175627 |
Apparatus and method for embedding and extracting information in analog signals using distributed signal features |
| Jan-16-2001 |
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... |
| 6148364 |
Method and apparatus for cascading content addressable memory devices |
| Nov-14-2000 |
A method and apparatus for cascading content addressable memory (CAM) devices is disclosed. The method and apparatus may be particularly useful when depth cascading CAM devices that operate in a flow-through... |
| 6101476 |
CD-ROM software protection system |
| Aug-8-2000 |
This Protection System, for PC Software stored in CD-ROM, prevents the illegal copying (hacking) with negligible cost increase of the protected Application. The same CD-ROM that contains the Application... |
| 6078668 |
Apparatus and method for concealing data bursts in an analog scrambler using audio repetition |
| Jun-20-2000 |
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... |
| 6064737 |
Anti-piracy system for wireless telephony |
| May-16-2000 |
A method and system are described for reducing the theft of wireless telephony services, such as cellular systems and PCS systems, altering voice data to steganographically embed verification data therein.... |
| 6035177 |
Simultaneous transmission of ancillary and audio signals by means of perceptual coding |
| Mar-7-2000 |
A communication system for simultaneously transmitting ancillary codes and audio signals via a conventional audio communications channel using perceptual coding techniques is disclosed. An encoder monitors... |
| 6035040 |
System and method for decryption in the symbol domain |
| Mar-7-2000 |
A method of decrypting data comprising encrypting bit-wise data, using a first plural bit mask, modulating the data into symbol format, and transmitting the symbol format data to a receiving apparatus,... |
| 6021203 |
Coercion resistant one-time-pad cryptosystem that facilitates transmission of messages having different levels of security |
| Feb-1-2000 |
A protocol is provided for transmitting low security messages and high security messages with one-time-pad cryptosystem. In one implementation of the present invention, low security messages are encrypted... |
| 5960080 |
Method for transforming message containing sensitive information |
| Sep-28-1999 |
A method for transforming an original message into a final message by including an untrusted service, includes the steps of identifying at least one sensitive term from the original message; replacing... |
| 5832057 |
Lockout device for preventing telephone eavesdropping from an extension device, and method |
| Nov-3-1998 |
Remote telephone coder 10R and local telephone coder 10L provide coding and decoding for voice communication between remote telephone set 11R and local telephone set 11L through telephone line 12. An eavesdropper... |
| 5822429 |
System for preventing global positioning satellite signal reception to unauthorized personnel |
| Oct-13-1998 |
A selective or tailored system for denying global positioning satellite (GPS) signal reception to unauthorized GPS receivers yet enabling authorized receivers to maintain access to the GPS system. The... |
| 5729607 |
Non-linear digital communications system |
| Mar-17-1998 |
A multiple access communications data and information transport system and methodology for employing the noise present in any conduit as a carrier form using wireless chaotic waveform signals supported... |
| 5655019 |
Identity protection method for use with wireless telephone systems |
| Aug-5-1997 |
A cellular phone identity protection system that protects the identities of cellular telephones as they initiate calls through a cellular telephone system. The identity protection is provided through the... |
| 5530390 |
Random clock generating circuit and method for control of electrical systems thereof |
| Jun-25-1996 |
A digital controller provides digital signals to audio modules; the digital signals include both clock signals and data. All of the logic circuits of the controller and of the modules are clocked on the... |
| 5394274 |
Anti-copy system utilizing audible and inaudible protection signals |
| Feb-28-1995 |
A system for preventing the unauthorized copying of audio or video recording by (1) processing the recorded material so as to identify the protected material in a manner that does not audibly distort the... |
| 5341423 |
Masked data transmission system |
| Aug-23-1994 |
A method and apparatus for masking the presence and content of data transmissions includes a mobile transmitter which encodes the data by means of a pseudorandom spreading (PRS) code having a chip rate,... |
| 5297201 |
System for preventing remote detection of computer data from tempest signal emissions |
| Mar-22-1994 |
A system for preventing the remote detection and decoding of computer data from RF or conducted signal emissions is disclosed. A simulator is coupled to the computer for emulating signal emissions in order... |
| 5267311 |
Intelligent diskette for software protection |
| Nov-30-1993 |
A device for protection of computer software installed on hard disks against unauthorized copying and use, and particularly a device of such type that is embedded inside an ordinary diskette cartridge.... |
| 5243648 |
Protective device for computers and the like |
| Sep-7-1993 |
In order to protect computers and the like against the pick up, the recording and the unauthorized use of data from the computers during the working thereof, and to protect them against high energy transient... |
| 5197098 |
Secure conferencing system |
| Mar-23-1993 |
An audio system for conducting confidential multi-person conferences without the need for secure meeting facilities. Means for silently accepting spoken speech from a number of participants and making... |
| 5086467 |
Dummy traffic generation |
| Feb-4-1992 |
In a secure communication system, a method for generating dummy traffic to forestall cryptanalytic attack by traffic analysis. Both the dummy traffic signal and certain characteristics of the dummy transmissions,... |
| 5008937 |
Scrambled-communication system using adaptive transversal filters for descrambling received signals |
| Apr-16-1991 |
In a scrambled-communication system, a transmitting station generates a scrambling noise having a periodically-recurrent series of noise patterns and scrambles an information signal by simply summing the... |
| 5003598 |
Secure communication system |
| Mar-26-1991 |
A secure communication system comprising signal manipulation and inverse signal manipulation means at the sending and receiving locations respectively, the signal manipulation processes being controlled... |
| 4932057 |
Parallel transmission to mask data radiation |
| Jun-5-1990 |
Aircraft often include a central memory which distributes data to a number of communication, navigational and other utilization devices. In order to achieve a high degree of security for data transmission... |
| 4932053 |
Safety device against the unauthorized detection of protected data |
| Jun-5-1990 |
The disclosure concerns the safety of the confidential information contained in integrated circuits. In a certain number of integrated circuit applications and, more particularly, in the circuits contained... |
| 4888799 |
Scrambling of signals by inversion |
| Dec-19-1989 |
The present invention is directed to an inversion scrambler and unscrambler having pseudo-randomly controlled polarity-reversing switches to invert and re-invert, respectively, an audio signal so as to... |
| 4802213 |
Sound masking in phase reversal TV scrambling system |
| Jan-31-1989 |
A TV scrambling system includes means for scrambling a TV signal by phase reversing the carrier at a horizontal rate. A sound masking circuit includes a phase locked loop which operates at five times the... |
| 4777529 |
Auditory subliminal programming system |
| Oct-11-1988 |
An auditory subliminal programming system includes a subliminal message encoder that generates fixed frequency security tones and combines them with a subliminal message signal to produce an encoded subliminal... |
| 4638357 |
Audio scrambler |
| Jan-20-1987 |
A method and apparatus are disclosed for scrambling and descrambling an audio signal. An interference signal is generated and is intermittently, preferably pseudo-randomly, added to the program audio as... |
| 4623919 |
Method and system for controlling access to transmitted modulated electromagnetic wave carried information |
| Nov-18-1986 |
A method and system for making possible enforceable subscription available electromagnetically transmitted communications. Mailable receiver tuning components are described which serve to make receivers... |
| 4573205 |
Technique for secure communications on FM radio channels |
| Feb-25-1986 |
This present invention relates to a system for providing secure communications without bandwidth expansion using an encryption method called masking whereby a masking signal is generated at the transmitter... |
| 4563546 |
Method for preventing "compromising radiation" |
| Jan-7-1986 |
A method of preventing "compromising radiation" when processing and transmitting secret data information in data processing and long-distance data transmission systems. In addition to direct, physical... |
| 4397034 |
Low probability of intercept transmitting apparatus |
| Aug-2-1983 |
A system for transmitting desired information is provided which has a very low probability of being intercepted. The system combines a well known narrow bandwidth directional antenna for limiting the interception... |
| 4225962 |
Mosaic printer |
| Sep-30-1980 |
A mosaic printer is made secure from unauthorized interception of data by falsifying the needle drive pulse current magnitude and sequence so that electromagnetic leakage radiation cannot be used to determine... |
| 4214126 |
Cadence suppression system |
| Jul-22-1980 |
1. A secret telecommunication system including a source of communication signals, a signal cadence suppression circuit including means responsive to the envelope of said communication signals for generating... |
| 4188506 |
Method and installation for masked speech transmission over a telephone channel |
| Feb-12-1980 |
A method and an installation for masked or scrambled speech transmission utilize a time-scrambling unit for dividing the speech band into at least two sub-bands, for delaying the one sub-band with respect... |
| 4098370 |
Vibration masking noise system |
| Jul-4-1978 |
A vibration masking noise system for delivering masking noise into a room or building is designed to vibrate part of the building structure so that masking noise is extended into the room. The system includes... |
| 4086634 |
Method and apparatus for preparing recorded program material to prevent unauthorized duplication by magnetic tape recording |
| Apr-25-1978 |
Unauthorized duplication of recorded audible program material upon magnetic tape, commonly known as tape piracy, is prevented and rendered detectable by the present method and apparatus for preparing the... |
| 4059726 |
Process and apparatus for speech privacy improvement through incoherent masking noise sound generation in open-plan office spaces and the like |
| Nov-22-1977 |
The invention involves the use of a plurality of incoherent noise generators distributed, in one embodiment, along ceilings in open-plan and partitioned office spaces and the like, to diffuse masking sound... |
| 4054751 |
Masking noise generator |
| Oct-18-1977 |
There is disclosed a masking noise generator which includes a digital means such as a shift register for generating noise signals wherein the output of the shift register is fed via a filtering means to... |
| 4040099 |
Method and apparatus for preparing recorded program material to render detectable unauthorized magnetic tape duplications, and method and apparatus for detecting such duplications |
| Aug-2-1977 |
Unauthorized duplication of recorded program material upon magnetic tape, commonly known as tape piracy, is rendered detectable by the present method and apparatus for preparing the program material. The... |
| 4024535 |
Sound generating system for a sound masking package |
| May-17-1977 |
A self-contained sound masking package including a housing having an interior forming a loudspeaker enclosure in the bottom of which is disposed an electric circuit arranged to be connected to an associated... |
| 3985200 |
Background sound system and apparatus for masking speech |
| Oct-12-1976 |
Background sound system provides audiofrequency energy in a large office space for masking speech. The system includes a plurality of downwardly directed speakers in speaker enclosures mounted on the top... |
| 3980827 |
Diversity system for noise-masking |
| Sep-14-1976 |
Masking-noise speakers are positioned in an array of lines and rows to direct masking noise into a space. Two separate noise generators provide noise signals respectively to two equalizer-amplifiers which... |
| 3958214 |
Encoded echo-ranging signal generator |
| May-18-1976 |
1. An encoded echo-ranging signal generator comprising in combination; A digital shift register having a plurality of binary encoded stages, A shift pulse generator coupled to said digital shift register... |
