Did You Know...
...that Robert Adler has the dubious distinction of being the Father of the Couch Potato? Back in 1955 Adler was employed by what was then Zenith Radio Corp., where he was charged to invent something that would allow viewers to turn down the TV volume without leaving their chairs. After a series of flops (such as a wired contraption that people tripped over), Adler hit on the idea of using sound waves. Thus the Remote Control was born...
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| Number | Title | Issue Date |
| 7949131 | Digital security system A system and method for processing a digital audio signal is disclosed. The system includes an input to receive a digital audio signal and a first output to provide a first digital output signal. The digital audio signal has a first fidelity characteristic and the f... | 05/24/2011 |
| 7545929 | Analog encryption The ability to securely transmit information between two locations is of paramount importance in today's communication systems. Before the invention of digital transmission methods, analog transmission was commonplace. However, today's communication systems rely alm... | 06/09/2009 |
| 7343292 | Audio encoder utilizing bandwidth-limiting processing based on code amount characteristics A mapping transform unit subjects input audio signals to a mapping transform and generates frequency region signals that take frequency as a variable; a code amount designation unit supplies a preset coding bit rate as a code amount output; a frequency region signal... | 03/11/2008 |
| 7310421 | Particular plaintext detector An object is to enhance the difficulty in decrypting ciphertext. In order to do input into an encryption algorithm that receives plaintext to output ciphertext, a particular plaintext detector for detecting that the plaintext satisfying a predetermined condition is ... | 12/18/2007 |
| 7277546 | Methods and apparatus for multi-level dynamic security system Methods and apparatus for converting original data into a plurality of sub-bands using wavelet decomposition; encrypting at least one of the sub-bands using a key to produce encrypted sub-band data; and transmitting the encrypted sub-band data to a recipient separat... | 10/02/2007 |
| 7236595 | Integrated optics encryption device The present invention relates generally to an integrated optics encryption device. The preferred embodiment of the invention is an integrated optics encryption device comprising a coherent light source connected to a multi-functional integrated optics chip (MIOC). T... | 06/26/2007 |
| 7197156 | Method and apparatus for embedding auxiliary information within original data The present invention relates generally to embedding and/or encoding auxiliary information within original data. For example, in one embodiment, a method of embedding auxiliary information in data is provided. The auxiliary information is not lost with compression o... | 03/27/2007 |
| 7100199 | Systems and methods for secure transaction management and electronic rights protection The present invention provides systems and methods for secure transaction management and electronic rights protection. Electronic appliances such as computers equipped in accordance with the present invention help to ensure that information is accessed and used only... | 08/29/2006 |
| 7013388 | Vault controller context manager and methods of operation for securely maintaining state information between successive browser connections in an electronic business system Techniques for use in establishing a secure exchange of information between an end user and a server in a distributed network environment are provided in accordance with a context manager. The context manager is manageable within a vault process and maintains state ... | 03/14/2006 |
| 7006634 | Hardware-based encryption/decryption employing dual ported key storage A system for the encryption and decryption of data employing dual ported RAM for key storage to accelerate data processing operations. The on-chip key storage includes a dual-ported memory device which allows keys to be loaded into memory simultaneous with keys bein... | 02/28/2006 |
| 6898288 | Method and system for secure key exchange A method for secure transmission of a data message locks, at the sender, the data message using a first lock. The locked data message is transmitted to the receiver. Next, the locked data message is double-locked, at the receiver, using a second lock. Then, this dou... | 05/24/2005 |
| 6834157 | Information signal processing apparatus An information signal processing apparatus according to the present invention is arranged to receive, as an input, an information signal to temporarily store therein the input information signal and to temporarily store therein management information prepared during... | 12/21/2004 |
| 6175639 | Digital data encode system A digital data encode system for inserting water mark data into digital data signals having a series of field data by use of a water mark data inserting device, the digital data encode system has a field judging unit dividing the digital data signals by a... | 01/16/2001 |
| 5995629 | Encoding device An encoding device includes an encoding unit and an output register downstream of the encoding unit. During a second time period, encoded output data are formed from input data fed to the encoding unit and are written into the output register. After the s... | 11/30/1999 |
| 5991416 | Scrambling and descrambling circuit for a cordless telephone A scrambling and a descrambling circuit for cordless telephone provides a higher security level than current phone scrambling circuitry. The higher security level is accomplished by separating an audio signal into low and high frequency bands. The frequen... | 11/23/1999 |
| 5778073 | Method and device for speech encryption and decryption in voice transmission A digitized real voice signal is converted via complex filtering into a complex signal that is subjected to sampling rate reduction, the bandwidth of the respective complex filter corresponding to the sampling rate. The complex signal is phase-modulated b... | 07/07/1998 |
| 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 |
| 5446795 | Universal decoder for television signal scramble systems A universal decoder for scrambled television signals in which the signals are processed in a circuit by converting them to other frequencies and then removing the scrambling signal. One method uses one or more narrow filters at a fixed frequency with the ... | 08/29/1995 |
| 5235640 | Master decoder for television signal scramble systems A master decoder for scrambled television signals in which the signals are processed in a circuit by converting them to other frequencies and then removing the scrambling signal. One method uses one or more narrow filters at a fixed frequency with the tel... | 08/10/1993 |
| 5018198 | Speech privacy processing method and apparatus therefor A speech privacy processing apparatus is disclosed including: a unit for obtaining the number of coefficients commonly included in a set of coefficients obtained by Fourier transformation and corresponding to high-frequency spectrum components of an input orig... | 05/21/1991 |
| 5008937 | Scrambled-communication system using adaptive transversal filters for descrambling received signals 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 scrambling noise to the information signal, whereby... | 04/16/1991 |
| 4949378 | Toy helmet for scrambled communications A toy helmet that permits the wearer to speak as to generate unintelligible noise so far as bystanders are concerned but which can be understood by another child wearing an identical helmet. Each helmet is equipped with internal and external microphones a... | 08/14/1990 |
| 4852166 | Analogue scrambling system with dynamic band permutation An analogue scrambling system with dynamic band permutation in which the speech signal is filtered (1), sampled (2) at the rate fe, digitized (3), transformed by means of an analysis filter bank (4) into N sub-band signals sampled at fe | 07/25/1989 |
| 4817141 | Confidential communication system The respective feature parameters extracted from a speech signal is converted into the corresponding line spectrum data in a first frequency band obtained by dividing the speech signal frequency band. Each of the line spectrum data is allocated previously... | 03/28/1989 |
| 4723246 | Integrated scrambler-encoder using PN sequence generator Simplified method and apparatus for performing integrated scrambling and encoding or descrambling and decoding of block code digital transmissions is disclosed. The method involves setting the scrambling length equal to an integer multiple of the block le... | 02/02/1988 |
| 4623918 | Pay television system utilizing multi-frequency passive filters Selected interference frequency signals are inserted into the video or RF signal at the transmitter for scrambling purposes, either singly or in pairs. At the receiving end the signals are decoded by use of filters matched to the transmitted signal. The s... | 11/18/1986 |
| 4519083 | Bilateral digital data transmission system A digital data transmission system for transmitting digital data from digital data handling hardware over a transmission line by analog signal representation and for receiving analog signal representation for reception of digital signals by the digital da... | 05/21/1985 |
| 4228321 | Privacy transmission system with remote key control In the prior art key control signals are produced at a scrambling location, used at that location for scrambling and then transmitted along with the scrambled message to the unscrambling location. In accordance with the present disclosure, improved privac... | 10/14/1980 |
| 4221931 | Time division multiplied speech scrambler A privacy communication system in which increased security is provided in the scrambling of speech signals. Input speech is separated into a high frequency band and a low frequency band, and each band is time scrambled independently and recombined prior t... | 09/09/1980 |
| 4206462 | Secure communication and ranging system 15. In a secure communication system a transmitter comprising first means to modulate a carrier wave with a sub-carrier wave and a desired signal, a code generator synchronized to said sub-carrier wave, second means to modulate the output of said first mo... | 06/03/1980 |
| 4058677 | Sound scrambling equipment Intelligence, such as voice signals, is scrambled for secrecy communication by translating the frequency spectrum of the intelligence by mixing the signals within the frequency spectrum with a local oscillator signal having a frequency that varies between... | 11/15/1977 |
| 3967067 | Secret telephony 1. In a system of secret transmission of speech, means to subdivide speech waves constituting a message into a plurality of narrow frequency bands, means to integrate the energy in each band, means individual to said bands to subdivide the integrated ener... | 06/29/1976 |
| 3936749 | Matched filter communication systems In a wideband matched filter communication system for transmitting digital nformation identified by initial sharp pulses from a transmitter thru a communication channel to a receiver, a filter network comprising a multiplicity of filter sections of differi... | 02/03/1976 |
