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7606363 |
System and method for context switching of a cryptographic engine
A cryptographic system, method, and device for implementing cryptographic functions designed to protect data is provided. The method includes (a) providing an algorithm processing unit, (b)...
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7592937 |
CABAC decoding unit and method
A context-based adaptive binary arithmetic coding (CABAC) method. The CABAC method for a bitstream comprises: detecting a control signal (Sig_first); decoding a first bin representing one of a...
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7584259 |
System and method for providing service technicians access to dispatch information
A secondary source of dispatch information is provided in the event of a failure of a primary source of dispatch information. The second source of dispatch information can be accessed...
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7583701 |
Apparatus and method for transmitting or receiving an uncompressed packet followed by compressed packets
A data transmission apparatus for sequentially transmitting data in units of packets each containing transmission data to the receiving end, comprises: a reception unit for receiving the...
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7489621 |
Adaptive puncturing technique for multicarrier systems
Various embodiments are described for adaptive puncturing techniques involving an adaptive bit loading block to select a modulation scheme and a puncturing pattern for each of a plurality of...
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7486700 |
Data transmission method for sequentially transmitting packets, data transmission apparatus, and data reception apparatus
A data transmission apparatus is provided for sequentially transmitting data in units of packets each containing transmission data to the receiving end, the apparatus including: a reception unit...
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7417943 |
Dynamic compression training method and apparatus
An apparatus for communicating between an access endpoint and a mobile device endpoint comprising a network service center attached to the access endpoint. A memory stores a prototype corpus...
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7372871 |
Techniques to reduce information loss and translation costs in a system populated with data sources and sinks communicating with multiple data representations
Techniques for reducing overall information loss and processing costs due to data translation in a network populated with communicating data sources and sinks of multiple data representations is...
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7224739 |
Controlled frequency signals
In some embodiments, a transmitter includes first encoding controlled frequency output circuitry to creates a magnitude encoded controlled frequency signal (CFS) and second encoding controlled...
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6920188 |
Method and apparatus for processing a multiple-component wide dynamic range signal
An apparatus is provided for processing a wide dynamic range analog signal which comprises multiple components such as a signal with an in-phase component and a quadrature-phase component in for...
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6643714 |
Modification and use of configuration memory used during operation of a serial bus
Information stored in configuration memory of a first device coupled to a communication bus is exposed to other devices allowing the other devices to ascertain the functionality of the first...
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6385656 |
Selective recompression of files in a network system
A recompression server that automatically decompresses selected pre-compressed data streams and recompresses the decompressed data to a greater degree than the original pre-compressed data. In one...
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6317613 |
Audio in a mobile receiver
A system and method are disclosed whereby, in order to achieve a desired receive audio dynamic range compression factor (e.g., 2:1) at higher background noise levels, an analog mobile station's...
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6111935 |
Adaptive expansion table in a digital telephone receiver
A digital telephone (60) comprises send equipment (40) and receive equipment (50), coupled via a signal splitter/combiner (61) onto a digital telephone line (62) for communication with a remote...
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5907584 |
System and method for transmitting and receiving a Lincompex signal having information encoded thereon through angle modulation
The system and method of the present invention include a modulator which encodes data on a communication signal using angle modulation. The demodulator, receiving the angle modulated communication...
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5689440 |
Voice compression method and apparatus in a communication system
The present invention comprises a method for compressing a plurality of voice signals within a voice communication resource (see FIG. 6) having a given bandwidth within a voice communication system...
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5678198 |
System for controlling signal level at both ends of a transmission link, based upon a detected value
The present invention is directed to a dynamic range enhancing system for increasing the dynamic range of a transmission link, characterized as either an analog or digital link. The system includes...
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5652782 |
Digital telephone overcoming international incompatibilities
A digital telephone (60) comprises send equipment (40) and receive equipment (50), coupled via a signal splitter/combiner (61) onto a digital telephone line (62) for communication with a remote...
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5631648 |
Signal compression or expansion circuit for mobile communication
A signal-processing circuit adapted for signal compression and expansion performed in the transmitter and receiver of mobile communication equipment. The signal-processing circuit comprises a...
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5495468 |
System and method for transmitting plural information waveforms over a single communications channel using lincompex techniques
At least two information waveforms are transmitted over the same communications channel using Lincompex techniques. Each of the information waveforms are modulated using Lincompex techniques to...
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5491685 |
System and method of digital compression and decompression using scaled quantization of variable-sized packets
A system and method of compressing and decompressing a digital signal using scaled quantization of variable-sized packets of difference samples. Difference samples are generated and subdivided into...
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5377255 |
RF repeaters for time division duplex cordless telephone systems
An RF repeater for interfacing with a base station for exchanging transmit and receive signals in a time division duplex cordless telephone system comprises a multicarrier amplifier having an input...
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5363207 |
Adaptor device for a facsimile
Data produced from a transmission source facsimile are received by a simulated communication circuit network, and thus received data are compressed and temporarily stored into a memory. After the...
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5249174 |
Time-division communication method for mobile bodies and system using said method
A mobile body communication method using a gateway exchanging unit for exchanging a communication between a radio base station and a plurality of mobile radio units, the radio station constituting...
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5182762 |
Modem having speed notifying means
A modem is connected to a terminal equipment and couples to another modem via a transmission line. The modem includes a data transmission and reception part for making data transmission and...
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5058202 |
System and method of transmitting and receiving a licompex modulated signal over a communication channel utilizing frequency modulation techniques
A system for transmitting and receiving frequency modulated signals utilizes linked compressor/expander (Lincompex) techniques. The signal to be transmitted is first processed by a Lincompex...
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4907217 |
System and method of transmitting a complex waveform over a communication channel utilizing lincompex techniques
Complex waveforms may be transmitted using Lincompex techniques by frequency shifting either the complex waveform, its envelope, or both, in order to ensure that the compressed complex waveform and...
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4823342 |
Time division exchange system having functions of compressing and expanding information
A time division exchange provided with a plurality of compression circuits for carrying out signal compression in accordance with a plurality of compression laws and a plurality of expansion...
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4740993 |
Digital companding circuit
A circuit for companding digital signals, incorporating a bidirectional barrel shifter in the form of an array of transmission gate cells for shifting step bits of a compressed PCM signal a...
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4597073 |
Full-duplex split-speed data communication unit for remote DTE
The disclosed data communication equipment (DCE) provides full-duplex, split-speed data communication over 2-wire dial-up telephone circuits, typically between a host processor and data terminal...
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4562571 |
Speech processing device for radioelectric equipment adapted for speech transmission and reception
The device is of the type comprising a circuit for compressing the dynamic of the speech signal before transmission of the signal at constant level and an expander for re-establishing at reception...
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4549304 |
ADPCM Encoder/decoder with signalling bit insertion
In an ADPCM transmission system, signalling frames of an incoming multiplexed PCM signal are identified and signalling bits extracted therefrom. During each signalling frame, an ADPCM...
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4542265 |
Echo canceller dynamic range extension
Echo cancellers provide echo return loss enhancement by subtracting a replica of the echo signal from the echo returned via the two-wire to four-wire transition. The echo replica is derived from...
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4535471 |
Compression/expansion device
A compression/expansion device is adapted to compress and expand gains of additive and subtractive signals at each level of at least two audio signals, characterized in that each audio signal or...
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4531208 |
Apparatus and method for reducing telephone channel power loading
Conventional telephone systems including terminal equipments interconnected by a communications channel typically employ a supervisory tone transmitted by each terminal equipment to indicate its...
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4513279 |
Charge redistribution mu-law PCM decoder
An integratable mu-law PCM decoder including only a single operational amplifier having a unit valued feedback capacitor C1, and second and third unit valued switched capacitors C2 and C3. Switch...
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4507650 |
Charge redistribution A-law PCM decoder
An integratable mu-law PCM decoder including only a single operational amplifier having a unit valued feedback capacitor C1, and second and third unit valued switched capacitors C2 and C3. Switch...
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4486876 |
Broadband transmission on limited bandwidth digital line
To insure timing recovery, T carrier requires that the signal contain no more than fifteen consecutive zeros and a "1"s density of at least one out of eight. When a 15 kHz audio program signal is...
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4396907 |
Digital to analog converter which uses main and auxiliary resistor networks
A digital-analog converter functioning according to the μ-law wherein a sequence control receives an input digital signal and controls the position of a plurality of switches so as to selectively...
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4388729 |
Systems for reducing noise in video signals using amplitude averaging of undelayed and time delayed signals
Noise reduction of a signal such as a video signal is effected by averaging a plurality of relatively delayed replica signals, e.g. with line or field delays therebetween, in a decoding processor,...
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4324000 |
Termination circuit for FDM/TDM processors
An interface circuit is provided to convert serial, 30 channel, compressed, sign magnitude FDM-PCM data provided by a pair of voice communication codecs (code/decode) into parallel, 60 channel,...
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4309676 |
Instantaneous compressor and instantaneous expandor
An instantaneous compressor and an instantaneous expandor both of which use the logarithmic characteristics of diodes to provide compression and expansion, respectively, of uncompressed analog PAM...
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4295223 |
Digital signal/noise ratio amplifier apparatus for a communication system
The signal-to-noise ratio of a signal to be transmitted through a communication channel having an upper and lower limit in magnitude is sampled digitally and a common corrective factor for the...
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4271499 |
Method and apparatus for digitally implementing a linked compressor-expander telecommunications system
A linked compressor-expander (LINCOMPEX) circuit for use in telecommunications is implemented digitally. A speech compressor circuit in a modulator and a speech expander circuit in a demodulator...
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4250492 |
Non-uniform weighting circuitry
A non-uniform weighting circuitry which is effective for enhancing speed and accuracy in the operations of encoders and decoders comprises in a cascade connection a constant current switch, a...
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RE30468 |
Signal compressors and expanders
The invention concerns a dynamic range compressor type encoder or expander type decoder, in which a main signal component in a main path is boosted or bucked by a further signal component derived...
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4234761 |
Method of communicating digital speech data and a memory for storing such data
A method of communicating Digital Speech Data to a speech synthesis circuit. The data is compressed to on the order of 1000-1200 bits, per second for normal human speech. The speech synthesis...
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4221934 |
Compandor for group of FDM signals
A system to individually compress the volume range of each voice signal in a group of frequency-division-multiplexed voice signals, without frequency dividing the voice signals into separate...
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4208740 |
Adaptive delta modulation system
An adaptive delta modulation system is disclosed which features an improved digital compandor which may be used with a digital integrating network. The compandor executes a companding algorithm...
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4205241 |
Quantized modulation systems
A system for modulation of the amplitude of a d-c voltage, the amplitude of an a-c carrier, or the frequency of an a-c carrier by signal, in which the signal amplitude is continuously compared...
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