284 results about "Signal chain" patented technology

To activate an interactive multimedia station (BN) providing facilities of a mobile office to a user of a mobile radio terminal (TM), the mobile terminal (TM) signals its presence in the vicinity of the station (BN), either by local radio link to the station itself, or by short messages to a management server (SB) when the terminal is a radiotelephone. An identifier of the terminal is transmitted from the station (BN) to the management server, or to a location recorder of the radiotelephony network (RR) to activate the station after validating the identifier.

A method and system to calibrate a motor circuit protection device is disclosed. An example method calibrates a signal chain of a circuit breaker. The signal chain includes a current transformer, a burden resistor, a stored energy circuit and a controller. The circuit breaker includes a memory coupled to the controller. A calibration instruction routine is written in a first location of the memory. A test current is injected in the circuit breaker signal chain. The test current peak of the test current in the circuit breaker signal chain is measured. Data indicative of the test current peak is stored in a second location of the memory. The test current peak data is read from the second location of the memory. The test current peak data is compared with nominal current data related to the signal chain remotely from the circuit breaker. A calibration factor is determined based on the comparison.

The transponder comprises an antenna and a receiver circuit (2) for receiving RF signals, this receiver circuit is implemented with a control mechanism to activate it at least periodically in a listening mode. This receiver circuit is comprises a decoding circuit (4), formed at least by a demodulator (8) and a decoder (10), and a wake-up circuit (14B) to analyze received RF signals in the listening mode and arranged for controlling the activation of the decoding circuit in this listening mode. The wake-up circuit comprises a frequency discriminator (17) and a digital modulation or preamble detector (18) downstream from a field clock generator (28). The wake-up circuit receives as entry an alternating signal branched from the signal chain through the receiver circuit upstream from the demodulator and it activates the decoding circuit only when a modulation or a preamble is detected in a received RF signal by the digital modulation or preamble detector.

Designs and operational methods to increase the dynamic range of image sensors and APS devices in particular by achieving more than one integration times for each pixel thereof. An APS system with more than one column-parallel signal chains for readout are described for maintaining a high frame rate in readout. Each active pixel is sampled for multiple times during a single frame readout, thus resulting in multiple integration times. The operation methods can also be used to obtain multiple integration times for each pixel with an APS design having a single column-parallel signal chain for readout. Furthermore, analog-to-digital conversion of high speed and high resolution can be implemented.

An CMOS active pixel sensor (APS) imaging system include circuitry to compensate for different analog offset levels from the CMOS pixel array. More specifically, the compensation is performed in the analog (charge) domain. A digital correction value, which may be measured as part of the operation or testing of the CMOS APS system, is provided to a offset correction block circuit, to generate an analog electrical signal. The analog electrical signal is supplied to a sample-and-hold circuit including a charge amplifier. The signal read from the pixel array, after conditioning through an analog signal chain, is also supplied to the charge amplifier, which has a linear transfer function and outputs the compensated signal.

Traffic service signaling data in signaling chain of stored-program control exchange in each telecom dept. are corrected through signaling correction unit in real time. Signaling correction unit through network port transfers corrected data to signaling corrector. The signaling corrector stores traffic service signaling data onto storage. Signaling decoder in call ticket generation module decodes signaling data in the signaling corrector; and based on signaling data flow, call data record (CDR) is generated. According to time period, CDR is converted to file CDR so as to generate original call ticket data. File transferring server in the call ticket generation module saves signaling data (original call ticket data) decoded by signaling decoder in a designated directory for computer to down load. Further, voice service analysis module and assistant balance module can be added to the system in order to carry out voice service analysis and settling accounts.

A wideband signal processing receiver system including an interface for connecting to an analogue to digital converter (ADC) of a broader signal chain lineup, wherein the interface receives digital data from the ADC, and a field programmable gate array (FPGA) and associated configuration for converting the digital data into two digital signal paths. The two digital signal paths include a frequency domain path and an optionally decimated time domain path. A memory and / or high speed bus stores or transfers high speed bus / link data from the frequency domain path and the time domain path.

The invention provides a digital television single frequency network radio frequency adapter and a broadband network system thereof. The adapter comprises a programmable module, and a broadband radio-frequency signal FM is subjected to down-conversion filtering to acquire a broadband intermediate frequency signal IF1. IF1 is switched in an intermediate frequency gain control module to acquire a broadband intermediate frequency signal IF2 with constant signal power. A / D conversion is performed to acquire a digital signal DATA1, which is switched in the programmable module to form DATA2=DATA1+delta t according to set time delay. The IF2 is subjected to D / A conversion to become a broadband intermediate frequency signal IF3 having accordant frequency domain with the IF2 and delayed time domain, and then the IF3 is subjected to up-conversion filtering to acquire a delayed broadband radio-frequency signal. The broadband network system is provided with the single frequency network radio frequency adapter. A multipath audio / video program source is processed by a front-end information source processing module, a channel processing module and a small signal broadband synthesizer into a small signal broadband radio-frequency signal FM. A signal chain transmits to each node, the single frequency network radio frequency adapter of each node adjusts the signal time delay and each broadband transmitter amplifies and transmits the signal FM, so the stability and covering effect of the system are improved and the cost is lowered.

A claimed utility box design that can be connected to a mobile phone with V.92 data modem function and a landline house telephone which is unsupported by local telephone service provider. The utility box houses a claimed circuit design to control signal currents for both in-coming and out-going phone calls, and a claimed controller program to utilize the data modem function of a mobile phone for making out-going phone call for voice communication. With this utility box, a mobile phone user can answer and make phone call on a connected house landline telephone set that is not supported by the traditional landline phone company service.

Cognitive radios by dynamically detecting available channels and changing their transmission or reception parameters allow increased concurrent wireless communications within a given spectrum band. It would be beneficial for such cognitive radios to exploit orthogonal frequency division multiplexing (OFDM) and accordingly establishing a spectrum monitoring technique suitable for OFDM-based cognitive radios an essential element for this. The inventors have established a technique allowing for the detection of the reappearance of the primary user within a reception period within an OFDM-based cognitive radio network and beneficially does so quickly without requiring received bit decoding and allows for different signal chain impairments to be considered. Further, the technique is applicable to address other important OFDM challenges for cognitive radios such as power leakage as well as extending the embodiments of the invention to multiple antenna systems.

The invention provides methods and apparatus for improving the direct current (DC) offset performance of an oversampling analog-to-digital (A / D) converter, including A / D converters that include an oversampling quantizer such as a single or multi-bit Δ-Σ modulator, successive approximation quantizer, flash quantizer, pipelined quantizer or other suitable oversampling quantizer. A customized buffer / amplifier may be inserted between an analog chopper and a signal processing chain. The customized buffer / amplifier is optimized for input noise and the signal chain compensates for poor DC performance. The result is a buffered analog-to-digital converter with both low input noise and very good DC accuracy.