58results about How to "Increase signal bandwidth" patented technology

A radio geolocation system is described in which a plurality of moving platforms such as aircraft concurrently receive a signal from a remote transmitter and the geolocation of the transmitter is determined. At each platform every thirty seconds a plurality of samples of the received signal are taken over a one second period. The samples are digitized and a time and GPS location stamp are added to each sample. The digitized samples with time and location stamps from all platforms are transmitted to a central location and stored in covariance matrices, one matrix per one second sample period. The signal samples in each matrix are processed utilizing a unique algorithm to generate a data set which defines a correlation surface. The data from a plurality of data sets are summed together on a point by point basis and normalized to yield a summation data set which defines a summation correlation surface. The summation correlation surface has a well defined peak that defines the geolocation of the remote transmitter.

A non-contact system utilizing an air-propagated ultrasound for monitoring biometric parameters is disclosed. A non-contact sensor transmits an ultrasonic wave toward a subject. The wave is reflected by the subject's skin surface back toward the sensor. Electronics in the sensor measure the small changes in displacement of the skin surface to derive a plurality of biometric parameters, including but not limited to respiration rate, heart rate, eye motion, and limb movement.

An echo cancellation invention which does away with the need for an accurate double-talk detector, while maintaining a higher adaptation gain for quicker convergence and also providing increased stability. It does this by operating two filter models of the acoustic path in parallel. One model is adapted continuously to find the most accurate model of the echo path, while the other is not. The echo canceller output is taken from the filter that is not adapted. A comparison of the residual error (echo) is done between the model being adapted and the model being listened to at regular intervals. When the model being adapted has less error (echo) than the model being listened to its filter coefficients are copied to the other model. If the model being adapted has greater error (echo) than the other model (caused by noise diverging the adaptation process) then the adapted model has its coefficients overwritten by the filter that is listened to. This process keeps error from accumulating in the adapted filter by removing divergence at regular intervals (improving overall convergence). Since the output is taken from the filter that is not adapted, higher adaptation gains may be used without fear of the user hearing any effects of adapting with a higher gain in the presence of noise.

A block-based image restoration system and method is provided. The image restoration system, including: an edge processing unit to perform a color shifting in an edge of an image and process the edge of the image; a restoration parameter extraction unit to segment the image into at least one domain and extract a restoration parameter for each block included in the segmented domain; and an image restoration unit to apply a block-based transform domain filtering according to the restoration parameter and perform an image restoration.

The present invention relates to a method for determining a relative position between a first device and a second device. A plurality of measurement signals is transmitted from the first device to the second device. Each measurement signal of the plurality of measurement signals is associated with a corresponding radio frequency spectrum in which the measurement signal is transmitted. A first radio frequency spectrum associated with a first measurement signal has a different frequency range than a second radio frequency spectrum associated with a second measurement signal of the plurality of measurement signals. At the second device the relative position based on at least the first and second measurement signals is determined.

A technique is provided to increase signal bandwidth of data processing signals by providing a plating stub as a filter using multiple line segments of different widths to filter the reflected high frequency components bouncing from the stub end toward the signal path. This stub-filter shifts the resonance point to a much higher frequency, placing that point of resonance beyond the bandwidth of interest without sacrificing a low frequency loss. Accordingly, there is provided an apparatus comprising a stub filter of a substrate, comprising a multi-segmented stub comprising a plurality of stub portions, where one of the stub portions has a different impedance than another of the stub portions.

The invention relates to a radar active interference signal parameter extraction and interference pattern recognition method and device and belongs to the technical field of signal processing. The method of combining broadband frequency domain processing and narrowband time domain processing is adopted, signals are accurately detected in real time by adopting a double-threshold signal detection algorithm, the method is advantaged in that signal bandwidth and frequency estimation precision is improved, pulse pressure data deviation rate calculation and peak value correction are carried out, pulse pressure peak value determination accuracy is improved, interference signal identification accuracy is substantially improved, the method is simple and convenient in application realization mode and strong in practicality, and simultaneous different-frequency multi-interference identification capability is realized.

An semiconductor integrated circuit includes a plurality of first pads having first size, a plurality of second pads having second size smaller than the first size, a switch circuit which couples the first pads to respective first core circuits in a first switching state, and couples the first pads to respective second core circuits in a second switching state, the second core circuits being connected to the second pads, wherein the first pads and the second pads are mixed and arranged in line.

Audio signal bandwidth expansion is performed on a narrow bandwidth signal received from a far end source. The far end source may transmit the signal over the audio communication network. The narrow band signal bandwidth is expanded such that the bandwidth exceeds that of the audio communication network. The signal may be expanded by performing frequency folding on the signal. One or more features are determined for the narrow bandwidth signal, and the expanded signal is modified based on a feature. The feature may be signal band energy slope, narrow band signal energy, or some other feature. The modification may be performed by a shelf filter selected based on the feature. The modified signals are provided for additional processing. In some embodiments, a noise component is added to the narrow band signal prior to folding to create an excitation that reduces the appearance of a fully harmonic signal characteristic.

The invention provides an SMA link double spreading code signal multiplexing method, which can significantly improve the relay satellite system S-band phased array multi-access link SMA transmission ability and the multi-target service ability and increase the signal bandwidth utilization rate. According to the technical scheme of the invention, in an uplink modulator at the relay satellite transmitting end, primary spreading code signals generated by N paths of array elements are subjected to secondary spreading treatment to generate double spreading code signals, one path of single-carrier reference signals generated by a crystal oscillator are subjected to the same spreading treatment, the N paths of array elements of double spreading code signals which keep synchronization are additively synthesized into one path of signals; and a relay satellite ground receiving system guides the N paths of secondary spreading signals to despread through firstly despreading the reference signals, the signals are combined into one path of signals through a digital beam synthesizer, the synthesized one path of signals are outputted to a baseband of the receiving end for primary spreading signal dispreading and demodulation, and each path of array element signals is restored.

A method for increasing the number of channels amplified by an optical amplifier arrangement is provided. The optical amplifier arrangement includes at least one optical amplifier stage amplifying a first number of channels at a given average gain level. The method begins by selecting a second number of channels to be amplified by the optical amplifier arrangement. At least one additional optical amplifier stage is serially coupled to an input or output of the at least one optical amplifier stage to form a multistage optical amplifier arrangement. The gain shape of the multistage optical amplifier is adjusted to maintain, at the given average gain level or greater, a prescribed degree of gain flatness over an operating bandwidth in which the second number of channels are located.

A repeater according to the present invention includes a plurality of excitation light sources with varying center wavelengths for use as an excitation light source to achieve Raman amplification; and comprises a flatness monitoring circuit which monitors the flatness of signal light on a transmission line; a monitor control circuit which controls externally said excitation light sources based on a remote supervisory control signal and which determines which of said excitation light sources to control as appropriate according to the flatness of signal light identified by said flatness monitoring circuit; and a bandwidth selective reflector or LD modules which, under the control of said monitor control circuit, outputs said flatness information to another repeater as a remote supervisory control signal with a specific wavelength, via said transmission line.

The present invention is directed to communication systems and electrical circuits. More specifically, an embodiment of the present invention provides a termination circuit that includes a programmable gain attenuation section, a T-coil section, and a termination resistor. The characteristic resistance of the programmable gain attenuation section matches the resistance of the termination resistor. There are other embodiments as well.

The invention provides a radar signal source system of a frequency stepping system, and the system comprises a step frequency baseband subsignal circuit which outputs a step frequency baseband subsignal B1; a first-stage signal conditioning circuit which outputs a step frequency signal B4; a second-stage signal conditioning circuit which carries out the frequency mixing with the step frequency signal B4 in a frequency mixer, successively adjusts the central frequency and bandwidth of the step frequency baseband subsignal, and obtains a UWB (ultra wide band) step frequency signal with the bandwidth B. The first-stage signal conditioning circuit and the second-stage signal conditioning circuit respectively comprise a frequency mixer, a local oscillator, a high-speed switch, and a filter. Through the successive adjustment of the central frequency and bandwidth of the step frequency baseband subsignal, the UWB step frequency signal is obtained, and the system can achieve the quick switching of the frequency.

A balancing circuit which may compensate for bandwidth attenuation introduced by interference between signals includes an amplifying circuit, a rising edge detection circuit and/or a falling edge detection circuit. By means of detecting the rising/falling edge of an original signal, the resulting pulse signal contains the phase information of a single “0” bit and a single “1” bit in the original signal, thus the phase of a rising edge or the phase of a falling edge of the original signal may be compensated respectively, so as to compensate for the high-frequency attenuation caused by interference between signals.

The invention discloses a composite amplifier. Voltage amplification is carried out on a direct current signal, a low-frequency signal and a high-frequency signal of input signals through a direct current amplification module and a broadband amplification module respectively, wherein the direct current amplification module adopts a high-precision operational amplifier. The amplification times of the direct current and low-frequency signals are adjusted through a first feedback module. The characteristic of high direct current precision is realized. The broadband amplification module amplifiesthe high-frequency signal and an output signal of the direct current amplification module by adopting amplification devices such as a transistor and the like. The characteristic of high bandwidth is realized. The transistor has good heat dissipation performance, can bear higher voltage , and has the characteristic of high voltage. The impedance of an output signal of the amplified signal is reduced through an output driving module. The output driving capability of the composite amplifier is improved, and the amplification factor of a high-frequency signal is adjusted through a second feedbackmodule, so that the composite amplifier has the characteristics of high bandwidth, high precision, high driving capability and high direct current precision at the same time.

A broadband planar inverted-F antenna includes a first radiation conductor, a second radiation conductor and a third radiation conductor. The first radiation conductor includes a first inclined-plane portion and a feeding point. The feeding point is located at one end of the first inclined-plane portion. The second radiation conductor is connected to the first radiation conductor at the feeding point. The third radiation conductor is connected to the first radiation conductor, and includes a second inclined-plane portion and a ground point. The second inclined-plane portion is separated from and facing to the first inclined-plane portion. The ground point is located at one end of the second inclined-plane portion and facing to the feeding point, wherein the distance between the first inclined-plane portion and the second inclined-plane portion is gradually increased from the part near the feeding point along a direction departing from the feeding point.