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7609614 |
Uplink modulation and receiver structures for asymmetric OFDMA systems
The present invention centers upon uplink communication protocols for use primarily with orthogonal frequency division multiple access (OFDMA) communication systems. Aspects of the invention relate...
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7558326 |
Method and apparatus for sending auxiliary data on a TMDS-like link
A communication system including a transmitter, a receiver, and a TMDS-like link, in which video data and auxiliary data (typically including timing data associated with other auxiliary data) are...
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7555061 |
Optical communication device
An optical sender is disclosed that operates in a Differential Quadrature Phase Shift Keying modulation scheme for high speed optical transmission and is capable of performing logical calculations...
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7472057 |
Detector for use in voice communications systems
One or more methods and systems of detecting or identifying one or more types of algorithms used in the encoding of a voice or speech waveform is presented. The system and method may be used as a...
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7453855 |
Multiuser detection and interference suppression techniques for direct sequence spread spectrum systems in which all users employ same spreading code
The present invention considers a direct sequence spread spectrum system wherein every user employs the same spreading code. In a preferred embodiment, received signal is correlated with the...
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7391813 |
Digital wireless communications device
A digital wireless communications device enabling call distance to be increased while avoiding mute processing as far as possible, even if code error occurs in an ADPCM code. The digital wireless...
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7376555 |
Encoding and decoding of overlapping audio signal values by differential encoding/decoding
Coding a signal is provided, wherein a first set of values is provided related to subsequent times in a first time interval of the signal, a second set of values is provided related to subsequent...
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7336713 |
Method and apparatus for encoding and decoding data
A DPCM operation which can reduce the size of differential data and a method and an apparatus for encoding data using the DPCM operation are provided. A method for generating differential data...
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7299012 |
Circuit to add and subtract two differential signals
An electrical circuit to add and subtract differential input signals may be implemented using distributed differential transmission lines having a length substantially equal to one quarter of a...
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7298783 |
Method of compressing sounds in mobile terminals
A method of compressing sounds in mobile terminals according to the present invention transforms pulse code modulations (PCM) codes, which are source data of bell sounds using recorded sounds or...
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7266152 |
Digital signal processing device and digital signal processing method
A device for performing predetermined processing on an input signal that may have a signal amplitude of more than one bit. The input signal is obtained by subjecting one-bit serial signals to...
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7184483 |
Technique for emulating differential signaling
A technique for emulating differential signaling is disclosed. In one exemplary embodiment, the technique is realized by encoding a plurality of input signals so as to generate a plurality of...
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7142597 |
Full bridge integral noise shaping for quantization of pulse width modulation signals
Systems and methods are described for full bridge integral noise shaping for quantization of pulse width modulated signals. A method for full bridge integral noise shaping comprises: receiving a...
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7092682 |
Electronic circuit, modulation method, information processing device, and information processing method
A shaped-wave application section inputs a first pulse signal corresponding to transmission data output from a transmission data output section, and applies, to a modulation and amplification...
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7088779 |
Method and apparatus for reducing the word length of a digital input signal and method and apparatus for recovering a digital input signal
A method and signal processing apparatus for reducing the number of bits of a digital input signal (M i ), includes adding a pseudo-random noise signal (N a ) to the digital input signal (M i ) to...
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7020208 |
Differential clock signals encoded with data
The number of pins on an integrated circuit chip is reduced by encoding control signals into a differential clock. The differential clock has two clock lines with complementary signals that...
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7006568 |
3D wavelet based video codec with human perceptual model
A video encoding/decoding system based on 3D wavelet decomposition and the human perceptual model is implemented. JND is applied in quantizer design to improve the subjective quality of compressed...
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6985531 |
Dual domain differential encoder/decoder
A method and apparatus that differentially encodes and decodes data symbols in dual domains is taught. Data packets are encoded, transmitted, and decoded during a plurality of symbol intervals on a...
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6898201 |
Apparatus and method for inter-node communication
A first set of signals is transformed into a second set of signals having a more stable set of current requirements. The more stable current requirements of the second set of signals are achieved...
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6882296 |
Method of encoding a digital data stream
A method of encoding a digital data stream which comprises providing a first stream of clock pulses at a first rate; deriving a second stream of clock pulses from the first stream at a second rate...
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6865230 |
Filter system with reduced switch thermal noise and a ΣΔ modulator using such a filter
A filter system with reduced switch thermal noise includes an input circuit for receiving an input signal and a feedback signal and providing a signal representative of the difference; a filter...
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6862317 |
Modulation technique providing high data rate through band limited channels
A digital data modulator is coupled to a source of a digital data signal. An encoder encodes the digital data using a variable pulse width code. A pulse signal generator generates pulses...
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6850572 |
Encoding/decoding apparatus and method for orientation interpolator node data
An encoding/decoding apparatus and method for an orientation interpolator node are provided. The encoding/decoding apparatus for an orientation interpolator node, which provides rotational...
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6768776 |
Transcoder-codec circuit arrangement and method that supports voice-switched hands-free radio operation
A transcoder-codec circuit arrangement that supports voice-switched hands-free radio operation. A first register is arranged to store a value indicative of a peak signal in a receive signal path, a...
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6738428 |
Apparatus and methods for decoding a predictively encoded signal and removing granular noise
A predictive decoder removes granular noise from the decoded signal by one of the following methods: discarding a predetermined number of least significant bits of the decoded signal; taking the...
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6727833 |
Adaptive &Sgr &Dgr modulation with one-bit quantization
An adaptive sigma delta modulator has an input stage, a conventional sigma delta modulator, and adaptation stage, and an output stage. The input stage produces a difference signal representing the...
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6707855 |
Digital delta sigma modulator in a fractional-N frequency synthesizer
A digital delta-sigma modulator for controlling a multi-modulus divider in a fractional-N frequency synthesizer features cascaded delta-sigma modulator stages in a feed-forward circuit topology to...
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6658383 |
Method for coding speech and music signals
The present invention provides a transform coding method efficient for music signals that is suitable for use in a hybrid codec, whereby a common Linear Predictive (LP) synthesis filter is employed...
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6594304 |
Adaptive configurable class-A/class-B transmit DAC for transceiver emission and power consumption control
A power efficient and reduced electromagnetic interference (EMI) emissions transmitter for unshielded twisted pair (UTP) data communication applications. Transmit data is processed by a digital...
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6590945 |
Method and apparatus for frequency offset compensation
A simplified method for frequency offset estimation in a TDMA cellular PCS environment using π/4-shifted DQPSK comprises the steps of multiplying a complex conjugate of a received complex-valued...
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6578162 |
Error recovery method and apparatus for ADPCM encoded speech
A method and apparatus for reducing the audible “clicks” or “pops” which occur when an ADPCM encoding and decoding system is employed in a communications system in which communication...
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6574281 |
Voice recording and playback mode using the G.726 half-rate within the personal handy phone system
Voice recording and playback mode using the G.726 half-rate within the personal handy phone system (PHS). When a portable station within the PHS operates as a voice recorder (e.g., functioning as...
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6549580 |
Subset averaged median predictor for differential pulse code modulation
A predictor for differential pulse code modulation that designates a subset averaged median (SAM) predictor, which removes transmission errors and/or minimizes error propagation. The SAM predictor...
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6546055 |
Carrier offset determination for RF signals having a cyclic prefix
A method of determining an integral portion of a carrier offset Δf c of an RF signal transmitted from a transmitter at a transmit carrier frequency f ct and an apparatus for carrying out the...
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6535153 |
Adaptive sigma-delta modulation with one-bit quantization
An adaptive sigma delta modulator has an input stage, a conventional sigma delta modulator, and adaptation stage, and an output stage. The input stage produces a difference signal representing the...
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6522662 |
Method and apparatus for providing a 10BASE-T compatible home network over a single twisted-pair phone line
A device for seamlessly providing 10BASE-T compatible data communications over an ordinary single twisted pair home phone line between multiple computers, between computers and peripherals, and...
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6463092 |
System and method for sending and receiving data signals over a clock signal line
The system preferably includes a unique transmitter that sends both clock and data signals over the same transmission line. The receiver uses the same transmission line to send data signals back to...
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6445745 |
Phase encoding methods for handling multiple phase modulated signals on a single channel
A method for phase encoding DPSK and N-PSK which maintains phase continuity and which does not require any reference symbols when using N-PSK. A sequence of known DPSK phases are encoded with...
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6418170 |
Method and apparatus for achieving 180° phase invariant transmission in a PCM modem system
In a PCM modem system in which equivalence classes are used to communicate information from a transmitter to a receiver, a method is provided to solve the problem of 180° phase reversals in the...
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6384753 |
High density analog interface
An interface module includes a high density analog interface (HAI) for electrical interconnection between a programmable logic controller (PLC) and an analog to digital converter (ADC) or a digital...
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6212238 |
Selective by-pass of analog mode in communication between digital devices
A device having alternative intercommunication formats, and an automated method of selecting the appropriate format to use, in dependence upon the ability of the device to which it is...
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6172965 |
Duplex transmission scheme
This invention relates to duplex and to half duplex transmission schemes and more particularly to the application of such schemes in TDMA and other multiple access environments. In accordance with...
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6125139 |
Narrowband digital cordless telephone
A digital cordless telecommunications unit that serves for communications when paired with a similar unit and connected with a network is disclosed. The unit receives analog receive voice signals...
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6112236 |
Method and apparatus for making quality of service measurements on a connection across a network
The quality of service provided by a connection in transferring data units (19) between first and second points (A, B) across a network (10), is measured by a method involving monitoring the normal...
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6097760 |
Data communications system
A data communications system includes a standard telecommunications apparatus (1) arranged to transport analogue signals in a form of Adaptive Differential Pulse Code Modulated (ADPCM) digital...
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6094458 |
Arrangements and methods for generating a radio frequency signal
The present invention relates to arrangements and methods for radio frequency modulation and power amplification of an information signal (X IF ). Modulation and amplification of the information...
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6078620 |
Method and apparatus for performing adaptive differential pulse code modulation
A method and apparatus for performing adaptive differential pulse code modulation. The method and apparatus is particularly adapted for compliance with the ITU-T G.726 international standard....
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6064699 |
Wireless speaker system for transmitting analog and digital information over a single high-frequency channel
A wireless speaker system that transmits and receives both analog and digital audio signals simultaneously over a single channel at frequencies above 900 MHz. The present invention advantageously...
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6055275 |
ADPCM transcoder
Known ADPCM transcoders use processors for coding and decoding, which are time and power consuming. Such a known ADPCM transcoder comprising one processor for coding and decoding can handle four...
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5982817 |
Transmission system utilizing different coding principles
In a transmission system for transmitting speech and music signals, an input signal is coded in a coder (11) by a time domain coder (4). The output signal of the time domain coder (4) is decoded by...
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