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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 8165300 | System and method for generalized authentication A system, method, and program product is provided that uses environments to control access to encryption keys. A request for an encryption key and an environment identifier is received. If the encryption key is not associated with the environment identifier, the req... | 04/24/2012 |
| 7340059 | Programmable scrambler and De-scrambler for digital telephony equipment A scrambler circuit for digital telephony equipment receives a sequence of input bits, generates the sequence of output bits based on the input bits and stores the sequence of output bits. The generating of the sequence of output bits includes selecting at least one... | 03/04/2008 |
| 7269564 | Method and apparatus to indicate an encoding status for digital content A method of determining an encoding rate for digital content. According to the method, the a sample of the content data is encoded for a predetermined period of time. The encoding rate is calculated by knowing the size of the sample of content encoded and the length... | 09/11/2007 |
| 7237115 | Authenticating concealed private data while maintaining concealment A method of and system for authenticating concealed and statistically varying multi-dimensional data comprising: acquiring an initial measurement of an item, wherein the initial measurement is subject to measurement error; applying a transformation to the initial me... | 06/26/2007 |
| 7233778 | Apparatus and method for converting a signal from a first analog format to a second analog format An apparatus for converting a signal from a first analog format to a second analog format. The apparatus has an input port, a first converter, filters, first mixers, second converters, and an output port. The input port is configured to receive the signal. The signa... | 06/19/2007 |
| 7088825 | Low I/O bandwidth method and system for implementing detection and identification of scrambling codes A system for detecting and identifying the identity of a base station or cell which transmits a scrambling code is provided. According to one aspect of the system, the system is used to perform scrambling code detection of eight (8) primary cells (each scrambling co... | 08/08/2006 |
| 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 |
| 6690795 | Multiple keys for decrypting data in restricted-access television system An encryption system for restricted-access television systems. Multiple decryption keys are used to decrypt encrypted material which is transmitted to customers of a restricted-access television system.... | 02/10/2004 |
| 6658112 | Voice decoder and method for detecting channel errors using spectral energy evolution A voice decoder detects channel errors and loss of cryptographic synchronization using the change in spectral energy between sequential frames. The change in energy between frames is determined between corresponding LSP's of said successive frames and sum... | 12/02/2003 |
| 6658113 | 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 parts of the audio of a signal in substitution for the data bursts. What otherwise would be periodic data bursts appearing at the audio output are replaced with selected porti... | 12/02/2003 |
| 6498851 | Data encryption and signal scrambling using programmable data conversion arrays A scrambling or encryption method involves analog-to-digital, digital-to-analog, analog-to-analog or digital-to-digital conversions that are constructed from one or more analog-to-digital or digital-to-analog conversions. For example, encryption of an ana... | 12/24/2002 |
| 6272633 | Methods and apparatus for transmitting, receiving, and processing secure voice over internet protocol This disclosure describes systems and methods for processing voice data for secure transmission and secure receipt over a network, such as the Internet. The systems and methods include the processing of analog voice and digital information, including conv... | 08/07/2001 |
| 6266412 | Encrypting speech coder Disclosed is an encrypting speech processor architecture that provides enhanced security without the use of external cryptosync and with minimal speech degradation. This is accomplished by incorporating a block encryptor and a keystream generator (instead... | 07/24/2001 |
| 6131160 | Method and apparatus for an adapter card providing conditional access in a communication system A method and apparatus for an adapter card, for use in a computer, to provide conditional access by the computer to incoming data streams while maintaining the security of information by maintaining a listing of addresses corresponding to data streams whi... | 10/10/2000 |
| 6078666 | Audio signal processing method and related device with block order switching An audio signal processing method and unit for scrambling and descrambling audio signals accompanying video signals. The audio signal processing method comprises steps of dividing digital audio signals into data blocks synchronized to video signals, and t... | 06/20/2000 |
| 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 |
| 5949878 | Method and apparatus for providing voice privacy in electronic communication systems An apparatus and method for creating voice privacy in electronic voice transmission systems includes the steps of digitizing an analog signal and inverting and rotating the frequency spectrum of the digitized audio signal. From the inverted and rotated sp... | 09/07/1999 |
| 5930365 | Digital data shuffling/de-shuffling system The invention provides a digital data shuffling/de-shuffling system so that information data is not understood or deciphered by unauthorized third party. Included are a system for generating plural bits of digital data to be transmitted, a circuit network... | 07/27/1999 |
| 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 |
| 5787180 | Method of connecting a scrambler or encryption device to a hand-held portable cellular telephone An apparatus and method for voice privacy for cellular phones includes generic connection points to make it universal for most cellular phones. The connection points include the speaker and microphone and the microphone input and speaker output of the cel... | 07/28/1998 |
| 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 |
| 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 |
| 5712905 | Sequential digital profile for processing analog signals An object of the present invention is to provide a method for creating an unique digital representation of multiple analog signals, and more particularly to provide a method for development of a sequential digital profile from selective incoming analog si... | 01/27/1998 |
| 5668879 | Audio scrambling system for scrambling and descrambling audio signals A scrambling system includes a scrambling apparatus and a descrambling apparatus for scrambling and descrambling digital audio codes having plural sub-band units. Each sub-band unit includes at least a scale factor and a quantized sample data which is qua... | 09/16/1997 |
| 5488663 | Encoding methods for generating a digital signal containing modulated bit allocation information, and record carriers containing that signal Transmission system for transmitting and receiving, and subband encoding methods for generating for transmission, digital signals containing modulated bit allocation information; and record carriers containing such a signal. The transmission system includ... | 01/30/1996 |
| 5454040 | Digital control of analog systems An audio mixing console incorporates a number of audio modules connected in series, with the first module being serially connected to a digital controller. The digital controller provides digital signals to the audio modules, the digital signals comprisin... | 09/26/1995 |
| 5412719 | Radio paging system with voice transfer function and radio pager A radio paging system with voice transfer function for transmitting a voice message input from an ordinary push-button telephone set to a small-sized receive-only unsophisticated radio pager. A paging station is provided to transmit by radio the message f... | 05/02/1995 |
| 5410599 | Voice and data encryption device A portable voice and data encryption device designed to be used with normal wideband telephone and cellular telephones, computers and facsimile machines to transmit voice and data in encrypted form. The V/DED comprises a voice and data encryption module, ... | 04/25/1995 |
| 5375171 | Transmission system, and transmitter and receiver used in the transmission system for transmitting and receiving digital signals containing modulated bit allocation information Transmission system, and transmitter and receiver for use in the transmission system for transmitting and receiving digital signals containing modulated bit allocation information. The transmitter encodes a wide-band digital signal into subband signals wh... | 12/20/1994 |
| 5199074 | Encryption system A communication system transmits and receives encrypted digital signal samples. The system includes a generator for generating digital signal samples to be encrypted and an encryption memory for storing the encrypted digital signal samples. The digital si... | 03/30/1993 |
| 5101432 | Signal encryption Method and apparatus for encrypting and subsequently decrypting an analog or digital signal are disclosed. During encryption the signal waveform is transformed by a substantially continuous non-linear complex function of frequency. The transformation is c... | 03/31/1992 |
| 5091941 | Secure voice data transmission system In the secure radio transmission system of the present invention the sign bit for each byte of audio digital data is scrambled to generate a scrambled sign bit. By altering the sign bit, the resultant sound is significantly affected regardless of the ampl... | 02/25/1992 |
| 4969191 | Fully digital phase-locked loop A fully digital phase-locked loop comprises a sampler (1), an analog-to-digital converter (2), two quadrature demodulators (3 and 4) and their associated filters (5 and 6), and a decision logic (7) effecting the correction of the sampling phase around the... | 11/06/1990 |
| 4953211 | Encryption apparatus Encryption apparatus mainly intended for encrypting speech signals samples a signal to be encrypted at two differing rates, and reads the sampled signal into storage means at one of said rates and reads it out of said storage at the other of said rates so... | 08/28/1990 |
| 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 |
| 4841571 | Privacy signal transmission system A privacy signal transmission system having a transmitter portion and a receiver portion. The transmitter portion digitizes an analog message signal and enciphers the digitized signal into a privacy signal before modulation and transmission to the receive... | 06/20/1989 |
| 4837821 | Signal transmission system having encoder/decoder without frame synchronization signal A privacy code-type signal transmission system includes a transmitter having a signal sampler for producing analog samples of an analog audio signal, an analog to digital converter, a scrambler, a multi-level analog former and modulator means. The analog ... | 06/06/1989 |
| 4823380 | Voice changer A voice changer for use generally with a telephone includes a first port for receiving signals from a microphone or the hand set, a second port for connection to a microphone or a telphone set, and a voice changer circuit for selectively changing the freq... | 04/18/1989 |
| 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 |
| 4773092 | Speech scramblers A band scrambler which processes only time domain samples is described. The band scrambler has the effect of dividing the input signal spectrum into N sub-bands. The N sub-bands are permuted such that the r th band is mapped onto the k.r th band modulo N,... | 09/20/1988 |
