Matches 1 - 50 out of 85 1 2 >
Match Document Document Title
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...
7536014 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...
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...
7505898 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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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...
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...
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...
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...
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...
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...
5365590 System for providing access to digitally encoded communications in a distributed switching network  
A distributed switching network (switch) routes audio and control signals throughout the switch from various audio sources to one or more audio destinations. Audio sources such as mobile/portable...
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...
5278907 Analog scrambling with continuous synchronization  
A device and method for scrambling and de-scrambling audio and voice communications including radio, cellular telephone, and conventional telephone communication. The audio communication can be...
5197098 Secure conferencing system  
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...
5148482 Layered session data unit frame  
A layered session data unit frame (300) is provided wherein a first frame (200), designated a session data unit("SDU"), containing user information (209), a link control field (205) and an...
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...
5065430 Voice band splitting scrambler  
Disclosed is a voice band splitting scrambler. To simplify the hardware thereof, the apparatus comprises a band splitting unit (11) for splitting an input voice signal into a plurality of band...
4981371 Integrated I/O interface for communication terminal  
An integrated I/O interface for a communication terminal, connectable with an external analog communication device and with an external digital communication device, includes an I/O interface...
4964165 Method for the fast synchronization of vocoders coupled to one another by enciphering  
A method for the fast synchronization of vocoders, coupled to each other by means of enciphering and deciphering devices, consists in synchronizing the data frames transmitted by the vocoders with...
4959863 Secret speech equipment  
Disclosed is a secret speech equipment for ensuring the secrecy of an analog voice signal, and used in voice communication systems such as an analog telephone and mobile radio. The equipment...
4937867 Variable time inversion algorithm controlled system for multi-level speech security  
A method for scrambling speech such as in a mobile land based communication system is disclosed. Essentially, variable length time samples of digitized speech are stored and time inversion...
4903298 System for providing encryption and decryption of voice and data transmissions to and from an aircraft  
A data communication system for an aircraft includes a voice encryption unit that is selectably included in the audio path between a user and a radio. The data communication system is...
4888799 Scrambling of signals by inversion  
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...
4873721 Device for starting charging in a pay phone  
The present invention relates to a device for starting telephone charging in a pay phone. The starting device essentially comprises a scrambler circuit (42) which is inserted in the line (26) when...
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 f e , digitized (3), transformed by means of an analysis filter bank...
4827507 Duplex analog scrambler  
An analog frequency inversion scrambler employing an exchange of random number seeds between an originating scrambler and an answering scrambler to create two pseudo-random frequency hopping...
4799257 Wireless transmission system for PM modulation signal  
A wireless transmitter for PM (phase modulation) signal with a spectrum scrambler for relocation of input spectrum for privacy purposes is comprised of a differential circuit coupled with an input...
4790009 Scrambler system  
A scrambler system comprises in a transmitter part thereof as oscillator circuit for generating a local oscillation signal, a frequency dividing circuit for obtaining a frequency divided signal by...
4726064 Wireless reception system  
A wireless receiver for a PM (phase modulation) signal with a spectrum scrambling for relocation of speech spectrums for the privacy of purpose is comprised of an antenna for receiving PM modulated...
4683586 Scrambling system for an audio frequency signal  
A scrambling system for an audio frequency signal is disclosed which employs a timebase-compressing and/or expanding system to measure the compressed and/or expanded amount of a segment time length...
4623919 Method and system for controlling access to transmitted modulated electromagnetic wave carried information  
A method and system for making possible enforceable subscription available electromagnetically transmitted communications. Mailable receiver tuning components are described which serve to make...
4623980 Method of processing electrical signals by means of Fourier transformations  
In order to upgrade input signals for further processing, one or more of the input signals is split up by a decimating technique into spectral component signals which are processed according to the...
Matches 1 - 50 out of 85 1 2 >