47results about How to "Accurate gain" patented technology

The present invention provides an apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals, where the apparatus includes M receive antennas, receiving M high data rate wideband packetized wireless communication signals, where each of the signals includes N frequency bins. The apparatus, in an exemplary embodiment, includes (1) a joint timing recovery units that perform joint coarse signal timing estimation, joint frequency offset estimation, and joint fine timing estimation on each of the signals, (2) M Fast Fourier Transform units (FFTs) that each convert the digital data for each of the M signals into frequency domain information for each of the N received frequencies and that output Q pilots for each of the signals, where Q is a positive integer, and (3) a combiner that weights and combines the outputs of the M FFTs for each of the N received frequencies.

An automatic gain control device for an electronic endoscope is provided and comprises a controllable gain amplifier, an A / D converter, a histogram circuit, and a CPU. The controllable gain amplifier amplifies image signals from an imaging device. Amplified image signals from the controllable gain amplifier are input to the A / D converter. A histogram of the amplified image signals from the controllable gain amplifier is produced by the histogram circuit when an image taken in a white-balance test accessory is taken. By using the CPU, the gain of the controllable gain amplifier is adjusted in accordance with the determination of whether a saturated pixel exists for signals in the tolerance range of the A / D converter, so that a linear region of the image signals from the controllable gain amplifier substantially coincides with the tolerance range.

In a sensor fusion apparatus and method for optical and magnetic motion capture systems and a record medium capable of being read through a computer having a writing of a program to realize the inventive method, in which a shortcoming of respective systems can be overcome and merits can be led by simultaneously using the optical motion capture system (OMCS) and the magnetic motion capture system (MMCS) to obtain motion capture data more precisely, the method includes a first step of obtaining an optical marker signal and a magnetic sensor signal for the motion capture object; a second step of converting the magnetic sensor signal into a corresponding optical marker signal, and acquiring a virtual optical marker signal; a third step of modeling a relation between the virtual optical marker signal and the optical marker signal to a dynamic model through a system identification; and a fourth step of using the optical marker signal as it is, when the optical marker signal is normal, and using a signal gained by inputting the virtual optical signal into the dynamic model, as a usage for a correction of the optical marker signal, by using the dynamic model when the optical marker signals are discontinuous, according to a normal or abnormal state of the optical marker signal.

Actual ultrasound attenuation in tissue is used to calculate gain compensation profiles which are used to create a uniform image. Axial, lateral, elevation gain profiles are used to correct the attenuation and ultrasound variation in each direction. In addition, automatic activation of the automatic gain compensation is described.

A control signal generating means of a sound effect generating device sets the reference volume that is the reference value of the volume of a sound effect when a vehicle is in a predetermined travel state, compares the measured volume of the sound effect detected by a sound effect detecting means when the vehicle is in the predetermined travel state and the reference volume, and corrects the gain of a control signal on the basis of the result of the comparison.

The invention provides robust and non-invasive calibration of an adaptive signal conditioning system having a signal conditioning block in the signal path to a signal conversion system, and a feedback path with a number of feedback components for enabling adaptation, by means of a parameter adaptation block, of the parameters used in the signal conditioning. In order to calibrate the feedback path, a well-defined reference signal is inserted into the feedback path, and an appropriate calibration coefficient is then determined by a coefficient calibrator in response to the received reference signal. The calibration coefficient is provided to a compensator, which effectively compensates for changes in the transfer characteristics of the feedback path due to factors such as variations in ambient temperature and component aging. Accordingly, the feedback signal transferred over the calibrated feedback path will be an accurate representation of the output signal of the signal conversion system, thus allowing accurate adaptive signal conditioning.

Disclosed herein are embodiments of an auto ranging system and method for an analog signal. A microprocessor is configured to digitally control the programmable gains of an operational amplifier based on the digital output of an A / D converter which may reside on or packaged along with the microprocessor. The amplifier receives a raw analog signal from a sensor and provides an amplified analog signal to the A / D converter. The gain of the amplifier generally corresponds to some range of the sensor signal. The A / D converter outputs a number of bits representative of the input signal. A microprocessor which is configured to digitally control the programmable gains of the amplifier receives and examines the output from the A / D converter and automatically adjusts the gain of the amplifier accordingly and as needed to keep or maintain the output from the A / D converter in a predetermined range.

An image capturing device includes: at least two field limiting parts which limit a field of view to a dot-like section to define a passage of light; a light sensor which detects light passing through the field limiting parts; a scanning device which moves a scanning spot defined by the dot-like section in two-dimensional directions within a scanning area of an image to be captured; and a control device which controls movements of the scanning spot by the scanning device while receiving detection signals from the light sensor.

This invention is about a readout apparatus and method for time-of-flight and energy measurements with silicon photomultipliers (SIPM) coupled to a scintillator. The timing measurement can be as accurate as 50 ps or below, after calibration. The energy is measured using a time-over-threshold technique, and the energy resolution is only constrained by the scintillation statistics. In order to achieve low power of 10 mW per channel, a low impedance input amplifier and analogue time-to-digital converters (TDCs) based on time interpolation are used. The readout circuit can be triggered by a single photoelectron (p.c.) with a signal-to-noise ratio (SNR) above 20 dB. The said readout circuit operates with SiPMs of different gain, polarity and matrix size. The preferred embodiment of the readout apparatus is a multi-channel application specific integrated circuit (ASIC) with 64 channels.

A level detector includes a comparing circuit and an integrating circuit. The comparing circuit generates pulses each having its width corresponding to the length of a time period during which the strength of an input signal is higher than a reference value. Alternatively, the comparing circuit may generate pulses each having its width corresponding to the length of a time period during which the strength of the input signal is lower than the reference value. The comparing circuit successively outputs the pulses. The integrating circuit outputs a signal having its strength corresponding to an integration value obtained by temporally integrating the signal from the comparing circuit.

The present invention relates to a mass flow controller for a control purge and a managing method of the same. When a user sets the mode to a control purge mode capable of controlling a maximum flowing amount for constantly maintaining a maximum flowing amount when performing a purge function after the user sets a purge function mode based on a purpose of use of a mass flow controller, a control circuit compares a set value of a flowing amount inputted based on a user's selection with a previously set threshold value and controls a valve for constantly maintaining a maximum flowing amount by switching to a gain resistor for a purge mode having a gain value capable of performing a purge function and controls a valve for thereby accurately controlling a small flowing amount by switching to a gain resistor for a common control mode having a gain value capable of performing a common control function. When a user sets the mode to a purge function mode based on a state of use of a mass flow controller, fully opens a valve and sets a valve open purge mode for obtaining a maximum flowing amount, a control circuit compares a set value of a flowing amount inputted by a user with a previously set threshold value and controls a valve for fully opening a valve for thereby implementing a maximum flowing amount and accurately controlling a small flowing amount.

The invention relates to a call quality control method and device and a mobile terminal. The method comprises following steps of obtaining the environment type of a current environment of the terminal; determining gain of a microphone corresponding to the environment type according to the environment type and preset mapping relationships, wherein the mapping relationships comprise corresponding relationships of different environment types and different microphone gains; and amplifying the voice signals collected by the microphone according to the gain of the microphone corresponding to the environment type. According to the method of the embodiment provided by the invention, the currently collected voice signals can be rationally amplified by the microphone; therefore, distortion of the voice heard by an opposite side resulting from excessively amplifying the voice signals is avoided; a condition that the opposite side cannot hear the voice clearly because the voice signals are not amplified enough is avoided; and the call quality when a local side and the opposite side carry out a call is improved.

Present invention relates to a fast automatic gain control method for receiving data short distance wireless networks, belonging to wireless communication technology field. It contains first receiving radio-frequency signal sent from short distance wireless networks in a time section, after frequency conversion processing to obtain a group of baseband receive digit signal, amplifying amplitude of a group of baseband receive digit signal according to current gain value. Proceeding statistics sampling point number whose signal amplitude is greater than target amplitude value in baseband receive digit signal, comparing said sampling point number with an ideal number range, circulation large or small amplitude adjusting gain value to continuously several time section signal, to make receiving signal amplitude approaching to A / D convertor full scale at automatic gain control ending. Said method reduces adjusting time and ensures accuracy of alignment.

A circuit for performing arithmetic operations includes a differential capacitive transimpedance amplifier (CTIA) and a cross-multiplexer. The cross multiplexer forwards the current to be integrated out of a plurality of current sources either to the positive input port of the differential CTIA for positive integration in direct mode or to the negative input port of the differential CTIA for negative integration in reverse mode.

The present invention provides a ΔΣ modulator of a frequency modulation system that can lessen the requirement of linearity for an oscillator.A ΔΣ modulator comprises an oscillating apparatus that changes a frequency thereof according to an input signal, a quantizing means for quantizing a frequency modulation signal output from the oscillating apparatus, and an operation means for applying an operation to a digital signal output from the quantizing means. The oscillating apparatus comprises an oscillator that changes a frequency thereof according to the input signal, a reference signal source that outputs a reference signal at a predetermined frequency, a mixer that receives the signals from the oscillator and the reference signal source, and a low-pass filter that passes a low frequency component of a signal output from the mixer. The center oscillation frequency of the oscillator is set higher than a target center oscillation frequency of the frequency modulation signal.

The present invention provides a ΔΣ modulator of a frequency modulation system that can lessen the requirement of linearity for an oscillator.A ΔΣ modulator comprises an oscillating apparatus that changes a frequency thereof according to an input signal, a quantizing means for quantizing a frequency modulation signal output from the oscillating apparatus, and an operation means for applying an operation to a digital signal output from the quantizing means. The oscillating apparatus comprises an oscillator that changes a frequency thereof according to the input signal, a reference signal source that outputs a reference signal at a predetermined frequency, a mixer that receives the signals from the oscillator and the reference signal source, and a low-pass filter that passes a low frequency component of a signal output from the mixer. The center oscillation frequency of the oscillator is set higher than a target center oscillation frequency of the frequency modulation signal.

The invention discloses a multi-channel signal amplifying circuit of a low-duty ratio narrow pulse signal and a control method. The multi-channel signal amplifying circuit of the low-duty ratio narrow pulse signal comprises a variable gain amplifying circuit, an adder circuit, a sampling keeping circuit and a master control unit module, wherein the master control unit module comprises a micro-control module; and an analogue-digital conversion module, a trigger circuit and a digital-analogue conversion module are integrated inside the micro-control module. According to the control method of the multi-channel signal amplifying circuit based on the low-duty ratio narrow pulse signal, the adder circuit can merge a plurality of paths of output signal amplitudes of the variable gain amplifying circuit into a path of signal; the micro-control module in the master control unit module judges the signal amplitude output by the adder circuit, and adjusts the voltage change output by the digital-analogue conversion module, so that the gain of a voltage-programmed variable gain amplifier is correspondingly changed, and the adder circuit outputs the pulse signal amplitude to stabilize at a set numerical value, so that a dynamic range output by the variable gain amplifier is reduced.

A control signal generating means of a sound effect generating device sets the reference volume that is the reference value of the volume of a sound effect when a vehicle is in a predetermined travel state, compares the measured volume of the sound effect detected by a sound effect detecting means when the vehicle is in the predetermined travel state and the reference volume, and corrects the gain of a control signal on the basis of the result of the comparison.

The acoustic properties of so-called instant fit ear tips, which in contrast to otoplastics are not produced individually, should be able to be better taken into consideration when adjusting a hearing aid for an individual wearer. To this end a method is proposed in which an OLG measurement, in other words an open loop gain measurement, is performed on the hearing aid when it is being worn. The OLG measurement curve obtained is compared with an OLG reference curve. A value is ascertained from the comparison which represents the level of closure of the hearing aid or of its otoplastic in the ear of the wearer. On the basis of this value the gain of the hearing aid is finally corrected. Furthermore, a corresponding adjustment device is provided. It is thus possible in a simple manner to take into consideration the individual, current level of closure during the adjustment.

The invention discloses a multi-channel bandwidth and gain adjustable signal processing system and method, and belongs to the technical field of electronics. The system comprises a low-pass module which is used for the low-pass filtering of a microwave voltage signal; a control module which performs channel gating on a first analog switch chip signal according to an upper computer signal and a '1'or '0' signal transmitted by a voltage comparator, and selects different to-ground resistances of an adjustable gain amplifier; the adjustable gain amplifier which amplifies the microwave voltage signal after gain and bandwidth selection and transmits an output voltage signal to the voltage comparator; and the voltage comparator which is used for judging whether the output voltage signal reachesa reference level or not, outputting the '1' signal to the control module if the output voltage signal reaches the reference level, and outputting the '0' signal if the output voltage signal does notreach the reference level. According to the present invention, the gain and the bandwidth are independently adjusted, the dynamic range of a microwave receiver is wider, and the signal stability is not influenced.

This invention relates to a method for carrying out first step searching to the initial areas of a user terminal including the following steps: dividing data of each sub-frame into M time slices, receiving signals in the M time slices in the continuous sub-frames and using the received signals of the sub-frames to slide the down synchronous codes orderly to accumulate the related results to get the maximum value of the related results of the time slices and its related down synchronous code and the position, taking the down synchronous code corresponding to the maximum value in M maximum values as the detected one for the first step of area research and getting the head position of the sub-frame detected for the area searching by the time slice and position information corresponding to the maximum value.

A reference voltage adjustment unit (212) calculates gain from a DA converter (121) to an offset calculating unit (123) by detecting the output of the offset calculating unit (123), adjusts the reference voltage (V3) from a reference voltage generation unit (211) so that the value becomes a predetermined value, and feeds the post-adjustment reference voltage (V4) to the DA converter (121) and offset calculating unit (123). Due to this, the gain from the DA converter (121) to the offset calculating unit (123) can be corrected. Fluctuation in the lower limit level of the output of a differential-to-single conversion unit (124) can be minimized as a result, so, the addition of unnecessary offset to the amplitude data at the amplifier unit (140) can be minimized. Thus, deterioration in modulation characteristics when the amplitude control unit (210) takes a differential circuit configuration can be minimized.

A speech recognition system includes a collector for collecting speech data of a speaker, an articulation pattern classifier for extracting feature points of the speech data of the speaker and selecting an articulation pattern model corresponding to the feature points, a parameter tuner for tuning a parameter which is a reference for recognizing a speech command by using the selected articulation pattern model, and a speech recognition engine for recognizing the speech command of the speaker based on the tuned parameter.

The invention provides a power supply system used for a silicon photomultiplier of a PET system. The power supply system comprises a data processing module, a temperature monitoring module, an operation module and a voltage supply chip. The system is used for providing stable and efficient voltage for the silicon photomultiplier.

The invention relates to a howling suppression method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring a current audio signal corresponding to a current time period, and performing frequency domain transformation on the current audio signal to obtain a frequency domain audio signal; dividing the frequency domain audio signal to obtain sub-bands, and determining a target sub-band from the sub-bands; obtaining a current howling detection result and a current voice detection result corresponding to the current audio signal, and determining a sub-band gain coefficient corresponding to the current audio signal based on the current howling detection result and the current voice detection result; obtaining a historical sub-band gain corresponding to the audio signal in the historical time period, and calculating a current sub-band gain corresponding to the current audio signal based on the sub-band gain coefficient and the historical sub-band gain; and performing howling suppression on the target sub-band based on the current sub-band gain to obtain a first target audio signal corresponding to the current time period. By adopting the method, the howling suppression accuracy is improved.

Attenuation cell comprising first and second differential pairs of bipolar transistors. A gain control device applies a voltage VA−VB between the bases of both differential pairs and comprises a set of three diodes in which a current IA, a current IB and the sum IA+IB of both preceding currents flow, respectively. The two diodes seeing current IB and IA+IB generate a voltage, respectively VB and VC, and the difference between these two voltages is used to generate a value Iz used in a control loop. A desired value Vct is transformed into information Ix, then into information Iy proportional to absolute temperature T, and an error amplifier uses information Iy−Iz and generates currents IA and IB by minimizing this difference.