35results about How to "High signal fidelity" patented technology

A Signal Conditioning Filter (SCF) and a Signal Integrity Unit (SIU) address the coupled problem of equalization and noise filtering in order to improve signal fidelity for decoding. Specifically, a received signal can be filtered in a manner to optimize the signal fidelity even in the presence of both significant (large magnitudes of) ISI and noise. The present invention can provide an adaptive method that continuously monitors a signal fidelity measure. Monitoring the fidelity of a multilevel signal can be performed by external means such as by the SIU. A received signal y(t) can be “conditioned” by application of a filter with an electronically adjustable impulse response g(t). A resulting output z(t) can then be interrogated to characterize the quality of the conditioned signal. This fidelity measure q(t) can be used to adjust the filter response to maximize the fidelity measure of the conditioned signal.

A method for measuring characteristics of a transmitter unit of a device under test is described. A signal generator is provided that comprises a baseband processing unit having at least a digital pre-distortion sub-unit. A device under test is provided that has a transmitter unit. A measuring unit is provided. Said signal generator and said device under test are connected with each other via an interface. At least one input signal is generated by using said signal generator, said input signal is forwarded to said device under test. An output signal of said device under test is measured by using said measuring unit. A first pre-distortion parameter for an increasing input amplitude is determined by using said digital pre-distortion sub-unit. A second pre-distortion parameter for a decreasing input amplitude is determined by using said digital pre-distortion sub-unit. Said first and second pre-distortion parameters are determined such that said output signal has a high fidelity. Further, a test system and a radio frequency device are described.

The invention discloses a differential piezoelectric digital geophone. The differential piezoelectric digital geophone comprises a geophone core which comprises a cylindrical shielding case, a base, piezoelectric elements, mass blocks, a signal conditioning unit, a signal preprocessing unit, feed-through capacitors and outgoing cables. The base is arranged in the center of the shielding case and in rigid connection with the shielding case; the two groups of piezoelectric elements are symmetrically attached to two sides of the base, and the two mass blocks are symmetrically attached to the outer sides of one group of piezoelectric elements; the two groups of piezoelectric elements are connected with an input end of the signal conditioning unit through outgaining electrodes at two ends of the piezoelectric elements, an output end of the signal conditioning unit is connected with an input end of the signal processing unit, and an output end of the signal processing unit is connected with the outgaining cables through the feed-through capacitors. By means of the geophone core in the symmetrical structure, differential signal output and direct digital processing of signals, the differential piezoelectric digital geophone has the advantages of high flexibility, high antijamming capability, wide dynamic range, portability, durability and the like.

An envelope detection circuit includes a signal rectifier, first and second capacitors, and first, second and third transistors. The signal rectifier includes an input port coupled to receive a modulated input signal, and an output port. The first capacitor has a first port coupled to the output port of the signal rectifier and a second port for coupling to a signal ground. The first transistor has a first port coupled to the output port of the signal rectifier, a second port for coupling to a signal ground, and a control port. The second transistor has a first port for coupling to a power supply, a second port, and a control port coupled to the output of the signal rectifier. The third transistor has a first port coupled to second port of the second transistor, a second port for coupling to a signal ground, and a control port. The second capacitor has a first port coupled to first port of the third transistor, and a second port for coupling to a signal ground.

Provided are a method and apparatus for encoding/decoding a media signal. The method of encoding a media signal includes: when harmonics exist in a sinusoid of a previous frame section, predicting a harmonic frequency of a current frame section that is to be encoded by using a harmonic frequency of the previous frame section, and generating a residual signal by using a difference between the predicted frequency and an actual harmonic frequency of the current frame section.

Devices and methods to mitigate the erroneous signal imparted by physical and/or chemical process incident upon analyte-selective electrochemical sensors that are non-analyte-related in origin are disclosed herein. A sensing system featuring at least one of an analyte-selective sensor and at least one of an analyte-invariant sensor.

A system and method for amplifying an information carrying signal provided on electrical supply power are provided. An input amplifier unit receives an input signal which contains an information carrying component and a supply power component. A power conversion unit is coupled to the input amplifier unit. The input amplifier unit amplifies the information carrying component of the input signal to generate an amplified signal. The power conversion unit generates at least one complementary set of offset supply levels each referenced to a non-zero offset ground level adaptively defined responsive to the electrical supply power, such that the amplified signal is referenced about the offset ground level. In certain embodiments, an output conditioning unit is employed to generate an output signal comprising an amplified version of the information carrying component of the input signal extracted from the amplified signal.

The invention relates to a device (110) for actuating and reading a group of ultrasound transducers (112) for ultrasound computer tomography, comprising a common substrate (116) having a first region(118) as an input channel (124) and a second region (120), which is electrically separated from the first region by means of n troughs, as an output channel (126); at least one high-voltage signal input (128) on the first region for receiving analog high-voltage signals; at least one high-voltage amplifier (132), which has high-voltage CMOS semiconductor components, on the first region (118) for receiving and amplifying the analog high-voltage signals; at least one group of ultrasound transducers (112) on the first region (118), wherein at least one of the ultrasound transducers (112) is designed to generate ultrasound signals during a transmission phase, and at least one of the ultrasound transducers (112) is designed to receive ultrasound measurement signals (140); at least one multiplexer (156) for combining ultrasound measurement signals (140) from at least two different ultrasound transducers (112) into a common measurement signal (148); at least one low-noise low-voltage pre-amplifier (152), which has CMOS semiconductor components, on the second region (120) for receiving the measurement signal (148); at least one output switch (150) on the second region (120) for canceling the application of the measurement signal (148) to the low-voltage pre-amplifier (152) at least during the transmission phase; and at least one low-voltage signal output (154) for transmitting a pre-amplified measurement signal (148) to an external control and analysis unit (212).

The invention provides a signal acquisition and processing system. The system is used for collecting and processing multiple paths of array element signals received by a phased array feed source. Thesystem comprises: a signal acquisition and preprocessing unit comprising a first preset number of nodes, each node acquiring a preset number of array element signals, preprocessing the array element signals, dividing the preprocessed array element signals into a second preset number of narrowband signals of different frequency bands, and outputting the second preset number of narrowband signals; acorrelation and beam forming unit which comprises a third preset number of nodes, wherein each node synthesizes the narrowband signals of the fixed frequency band in the first preset number of nodesinto a fourth preset number of beams; and a multi-beam astronomical processing unit which is used for analyzing and storing the beams.

The embodiment of the invention discloses a bimodal image signal processor and a bimodal image signal processing system, and the bimodal image signal processor comprises a synchronous image signal processor which is used for processing a synchronous signal in a bimodal image signal; an asynchronous image signal processor used for processing asynchronous signals in the bimodal image signals; and a neural network unit used for processing and outputting the synchronous signal output by the synchronous image signal processor and the asynchronous signal output by the asynchronous image signal processor according to a neural network algorithm. According to the scheme, the dual-mode image signal processor can process synchronous signals and asynchronous signals in the dual-mode image signals at the same time, very high signal fidelity can be achieved when images are shot at a high speed, and meanwhile high dynamic range and high time resolution can be achieved. Moreover, artificial intelligence related tasks such as a region of interest can be marked in real time by utilizing the neural network unit on the basis of ensuring low power consumption.

Optical modulators are described having a Mach-Zehnder interferometer and a pair of RF electrodes interfaced with the Mach-Zehnder interferometer in which the Mach-Zehnder interferometer comprises optical waveguides formed from semiconductor material. The optical modulator additionally comprises a plurality of phase shifters configured to interface with the plurality of interconnected optical waveguides such that at least one phase shifter of the plurality of phase shifters is interfaced with at least one optical waveguide of the plurality of interconnected optical waveguides. A phase shifter controller, including an energy source with a variable output controlled by the controller and a plurality of electrical connections connecting the energy source to each of the plurality of phase shifters, is also included. In various embodiments, the plurality of electrical connections are configured to provide approximately equal power to each of the phase shifting elements from the energy source.

Disclosed herein are biomimetic scaffolds for nervous tissue growth having a plurality of microchannels disposed within a sheath. Each microchannel includes a porous wall formed of a biocompatible and biodegradable material. The biocompatible and biodegradable material may be a poly (ethylene glycol) diacrylate, a methacrylated gelatin, a methacrylated collagen, or a polycaprolactone, and combinations thereof. The bionic stent has a high open volume percentage, can achieve excellent (linear and high fidelity) nervous tissue growth, and meanwhile reduces inflammation near an in-vivo implantation site to the maximum extent.

The invention discloses a radio frequency transmitting device and an earphone. A first amplifying circuit in the radio frequency transmitting device amplifies an initial radio frequency signal to generate a target radio frequency signal; and a first gating circuit feeds back the signal transmission intensity of each wireless transmitting component in the respective signal transmission direction, and correspondingly gates the wireless transmitting component with the maximum signal transmission intensity in the signal transmission direction according to the switching signal, and the component wirelessly transmits the target radio frequency signal. The first control circuit outputs an initial radio frequency signal to the first amplification circuit, and correspondingly outputs a switching signal according to the signal transmission intensity fed back by the first gating circuit. According to the radio frequency transmitting device and the earphone, the signal transmission directions of the wireless transmitting assemblies are different, the target radio frequency signal is only sent outwards in the direction with the maximum signal transmission intensity, and the target radio frequency signal is obtained after the initial radio frequency signal is amplified, so that the effective communication distance is increased, the signal fidelity is high, and the user experience is high.

An apparatus and method for noninvasively measuring intracranial pressure of a subject using an ultrasound transducer. The transducer is used to measure arterial wall movement of an intracranial segment and an extracranial segment of the subject's ophthalmic artery as different external pressure forces are applied to the orbital area of the subject. When the waveforms of arterial wall movement between the intracranial segment and the extracranial segment are similar the intracranial pressure can be determined.