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| Number | Title | Issue Date |
| 7558389 | Method and system of generating a speech signal with overlayed random frequency signal A method and apparatus utilizing prosody modification of a speech signal output by a text-to-speech (TTS) system to substantially prevent an interactive voice response (IVR) system from understanding the speech signal without significantly degrading the speech signa... | 07/07/2009 |
| 7522730 | Universal microphone for secure radio communication A microphone unit comprising a voice input for receiving a voice input signal, an analog to digital converter for creating a digital signal from voice signal, a voice coding device for creating a voice coded signal output from the digital signal, encryption means fo... | 04/21/2009 |
| 7460671 | Encryption processing apparatus and method for voice over packet networks In one aspect, a device includes an encoder configured to receive a speech sample and generate an encoded voice packet from the speech sample, the encoded voice packet having a packet size and a plurality of bytes. The device also includes an encryption unit configu... | 12/02/2008 |
| 7362867 | Apparatus and method for generating scrambling code in UMTS mobile communication system A scrambling code generating apparatus of a downlink transmitter in a UMTS mobile communication system, which uses one primary scrambling code for separation of base stations and multiple secondary scrambling codes for channel separation. The apparatus includes a fi... | 04/22/2008 |
| 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 |
| 7271640 | Mixer circuit with bypass and mixing modes having constant even order generation and method of operation A mixer circuit configured to operate in a bypass or mixing mode, and which comprises a mixer core, and a mode select circuit. The mixer core includes first and second switches, each of which has an input, and first and second outputs. The mode select circuit is cou... | 09/18/2007 |
| 7260223 | Data transfer system In a data-sending device, a data generation section provides input data itself or a bit-inverted version of the input data as intermediate data and generates an inversion signal that indicates whether or not the intermediate data is the bit-inverted version of the i... | 08/21/2007 |
| 7184952 | Method and system for masking speech A simple and efficient method for producing an obfuscated speech signal which may be used to mask a stream of speech, is disclosed. A speech signal representing the speech stream to be masked is obtained. The speech signal is then temporally partitioned into segment... | 02/27/2007 |
| 7143028 | Method and system for masking speech A simple and efficient method for producing an obfuscated speech signal which may be used to mask a stream of speech, is disclosed. A speech signal representing the speech stream to be masked is obtained. The speech signal is then temporally partitioned into segment... | 11/28/2006 |
| 7120255 | Java applications for secured palm held cellular communications The present invention is a data processing apparatus and method for encrypting, sending, receiving, and decrypting secure transmissions using a cellular telephone. The user may either purchase a cellular telephone which contains the encryption and decryption softwar... | 10/10/2006 |
| 7099568 | Information playback apparatus and electronic pop advertising apparatus An information playback apparatus includes a storage memory removably attached to a main unit and in which compressed moving image file data are electrically stored; an MPEG decoder in the main unit for reading the data and decompressing it; an NTSC encoder in the m... | 08/29/2006 |
| 7065417 | MPEG portable sound reproducing system and a reproducing method thereof Disclosed is an MPEG portable sound reproducing system and a method for reproducing sound data compressed using the MPEG method. The inventive system includes power supply means for supplying operational power to the system, the power supply means being realized thr... | 06/20/2006 |
| 7046809 | Device and method for scrambling/descrambling voice and data for mobile communication system The device and method for scrambling/descrambling voice/data in a mobile communication system involves vocoding or bypassing a signal received from a radio channel interval, scrambling the vocoded or bypassed signal using a random number, sending the scrambled signa... | 05/16/2006 |
| 7047405 | Method and apparatus for providing secure processing and data storage for a wireless communication device Techniques for providing secure processing and data storage for a wireless communication device. In one specific design, a remote terminal includes a data processing unit, a main processor, and a secure unit. The data processing unit processes data for a communicati... | 05/16/2006 |
| 6996237 | Apparatus and methods for including codes in audio signals Apparatus and methods for including a code having at least one code frequency component in an audio signal are provided. The abilities of various frequency components in the audio signal to mask the code frequency component to human hearing are evaluated and based o... | 02/07/2006 |
| 6993321 | Wireless telephone system with mobile instruments for outgoing calls A telecommunication system incorporates individual station instruments simplified by wireless operation, voice dialing, prepaid accounting and out-call operation, all enabled by cooperative system operation including supporting central equipment. Wireless operation ... | 01/31/2006 |
| 6961431 | Analog privacy scrambler and scrambling method A system and method for maintaining privacy in transmission of a high bandwidth analog signal. A preferred system and method breaks an input signal into bands and then uses Walsh codes to overlay many signals on top of each other with a set of phase modulators to es... | 11/01/2005 |
| 6917802 | Mobile keyless telephone instruments and wireless telecommunications system having voice dialing and voice programming capabilities A telecommunication system incorporates individual station instruments simplified by wireless operation, voice dialing, prepaid and custom-programmed operating characteristics, all enabled by cooperative operation with supporting central equipment. Wireless operatio... | 07/12/2005 |
| 6907123 | Secure voice communication system A secure real time voice communication system 70 is provided that allows for the secure transmission of voice communications between a sending device 72 and a receiving device 78 through the public switch telephone network 76. The device ... | 06/14/2005 |
| 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 |
| 6421445 | Apparatus and methods for including codes in audio signals Apparatus and methods for including a code having at least one code frequency component in an audio signal are provided. The abilities of various frequency components in the audio signal to mask the code frequency component to human hearing are evaluated ... | 07/16/2002 |
| 6356638 | Radio wireline interface and method for secure communication An interface between a digital communication system and a PSTN establishes a user configurable secure encrypted link to a digital subscriber unit through the digital communication system, and provides clear (unencrypted) voice to telephone sets through th... | 03/12/2002 |
| 6339646 | Slotted mode code usage in a cellular communications system The downlink channelization code limitation problem encountered in spread spectrum or CDMA cellular systems is resolved by using codes from a different, non-orthogonal code set when operating in the slotted mode. The non-orthogonal code sets can be constr... | 01/15/2002 |
| 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 |
| 6266418 | Encryption and authentication methods and apparatus for securing telephone communications An encryption device for a telephone having a handset and a base unit is disclosed. The device includes a handset interface, a first converter, an encryption processor, a second converter, and a host interface. The handset interface receives analog output... | 07/24/2001 |
| 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 |
| 6260143 | Host-based caching method and system for copy protected content A method and system of read-ahead caching for use in a DVD player utilizing CSS titles is disclosed. The caching system is a host-based read-ahead caching system that utilizes a threaded architecture for caching. One thread is dedicated to retrieving data... | 07/10/2001 |
| 6256491 | Voice security between a composite channel telephone communications link and a telephone An apparatus and method for security of individual communications over a composite communications channel such as T1 or E1. The composite channel is digitized. Individual channels are separated, but identifying information of each channel is retained. A level ... | 07/03/2001 |
| 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 |
| 5852662 | Scrambler bypass system A cordless phone configured to operate in both a scrambling mode and non-scrambling mode comprises a base station and a cordless handset terminal. Both the base station and the cordless handset terminal include voice scrambler circuits for scrambling and ... | 12/22/1998 |
| 5784422 | Apparatus and method for accurate synchronization with inbound data packets at relatively low sampling rates An apparatus and method for accurate synchronization with inbound audio data which packets at relatively low sampling rates. By using previously known information such as the time of arrival of the beginning of the data packet, a reference timer in a digi... | 07/21/1998 |
| 5764763 | Apparatus and methods for including codes in audio signals and decoding Apparatus and methods for including a code having at least one code frequency component in an audio signal are provided. The abilities of various frequency components in the audio signal to mask the code frequency component to human hearing are evaluated ... | 06/09/1998 |
| 5742679 | Optimized simultaneous audio and data transmission using QADM with phase randomization An subsystem processor for converting an input audio signal to complex audio samples for QADM processing by a modem for communication with a remote modem is disclosed. The audio process comprises a decorrelator for processing the input audio to generate a... | 04/21/1998 |
| 5710813 | Digital voice recording/reproducing apparatus A digital voice recording/reproducing apparatus comprises a user identification code memory, provided in a main body, for storing a predetermined user identification code in advance before the apparatus is shipped from a factory, a voice cartridge attachi... | 01/20/1998 |
| 5621800 | Integrated circuit that performs multiple communication tasks An integrated circuit that provides multiple communication functions is accomplished by providing an integrated circuit (24) that includes memory (70) which stores an audio code algorithm, echo cancellation information, a modem processing algorithm, and a... | 04/15/1997 |
| 5617476 | Audio scrambling system for scrambling and descrambling audio signals A scrambling system has a scrambling apparatus and a descrambling apparatus for scrambling and descrambling a digital audio signal having a plurality of 16-bit long sample data units. The scrambling apparatus has a detector for detecting, in each sample d... | 04/01/1997 |
| 5541997 | Method and apparatus for detecting correctly decrypted communications In a receiver (100), an encrypted communication (104) is decrypted using a decryptor (101) and a key (107) to produce a decrypted communication (105). A comparator (103) compares decrypted symbol patterns in the decrypted communication against a set of pr... | 07/30/1996 |
| 5528693 | Method and apparatus for voice encryption in a communications system A world-wide cellular radio telecommunications system utilizing low-earth orbit satellites provides secure transmissions of voice and data even though the length of the signal path of the communications link is dynamic. Crypto-algorithm generators at each... | 06/18/1996 |
| 5450490 | Apparatus and methods for including codes in audio signals and decoding Apparatus and methods for including a code having at least one code frequency component in an audio signal are provided. The abilities of various frequency components in the audio signal to mask the code frequency component to human hearing are evaluated ... | 09/12/1995 |
| 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 |
