39 results about "Universal filter" patented technology

The invention relates to a method for lowering the peak-to-average power ratio of universal filtering multicarrier signals. The method comprises the following steps of: (1) establishing a system model; (2) setting that the sampling points are mutually independent and identical in distribution, and utilizing numerical calculation to analyze the system model; (3) theoretically analyzing a high peak-to-average power ratio (PAPR) of universal filtering multicarriers (UFMC), and obtaining a complementary cumulative distribution function (CCDF); (4) analyzing system parameters of the universal filtering multicarriers (UFMC); (5) utilizing a Largrange method to obtain an optimal solution of the complementary cumulative distribution function; and (6) establishing the relation between filter parameters and the complementary cumulative distribution function (CCDF). According to the invention, the relation between the UFMC peak-to-average power ratio statistic characteristics and the filter coefficients is analyzed, a Largrange optimization method is utilized to obtain the CCDF optimal solution of the UFMC and the expressions of theoretical relations of the filter parameters, the design of a filtering multicarrier system is guided, and the peak-to-average power ratio is further lowered.

The invention discloses a multi-channel pipeline FIR filter, including a channel merging device, a zero-order filtering unit, a plurality of universal filtering units connected in series and a channel splitting device. M paths of input data pass through the channel merging device and are merged into one path to be output; a path of output signal of the zero-order filtering unit enters a buffering shifter, after buffering shifting, enters a second multiplier, multiplication operation is carried out on the output signal and an output signal of a second coefficient storage unit, a result is output to a multiplication output register block, a delayed signal and the other path of output signal of the zero-order filtering unit are added through an adder, and are then output to an addition output register block; and the channel splitting device is used for extracting parallel M paths of data from serial filtering signals to be output. The multi-channel pipeline FIR filter provided by the invention has high operation efficiency, supports input data interruption transmission, has a simple cascade mode, the order is easy to expand, and the universality is high.

An analytical Synthesis Method (ASM) is clearly and effectively demonstrated in the realization of current / voltage-mode Operational Trans-conductance Amplifier and Capacitor (OTA-C) circuits, where a complicated nth-order transfer function is manipulated and decomposed by a succession of innovative algebra operations until a set of simple equations are produced, which are then realized using n integrators and a constraint circuitry. The circuits realized includes voltage-mode nth-order OTA-C universal filter structures, tunable voltage / current-mode OTA-C universal biquad filters, voltage-mode odd / even-nth-order OTA-C elliptic filter structures, voltage / current-mode odd-nth-order OTA-C elliptic high-pass filter structures, and OTA-C quadrature oscillators. Some realized OTA-C circuits can be simplified to be OTA-only (OTA-parasiic C) circuits which fit for the operation at high frequencies.

The invention relates to a compressed sensing and high-speed mobility-based universal filtered multicarrier (UFMC) system wireless channel estimation method, belonging to the field of wireless communication. The method comprises the steps of building a system model, analyzing a UFMC system parameter of an inserted PN sequence, and determining sending and receiving signal models in a multi-path channel; analyzing a temporal correlation and a sparse characteristic of the multi-path channel; performing self-related channel coarse estimation based on the PN sequence; estimating a channel delay position accurately based on a compressed sensing algorithm; performing channel amplitude accurate estimation of an LS algorithm; and analyzing performance and a simulation result. According to the method, the impact of noise of CIR of R<g> consecutive symbols in an average correlation time in the channel coarse estimation process on the signal is lowered by fully utilizing channel temporal correlation, so that the coarse estimation accuracy of the channel time domain impulse response is further improved; and the channel time delay and sparsity accuracy estimated by an improved SAMP algorithm are further improved by fully utilizing information obtained through coarse estimation, and the traditional SAMP algorithm is less complex.

In an embodiment, a computer-implemented method detects updates to a domain name system record system. In the method, a stream of data points is received with each data point describing a record of a domain name system. For respective data points, a processor is selected from a plurality of processors. The processors are each configured to apply a data point against a common filter that assesses whether the data point is in a set. At the selected processor, the respective data point is applied to the common filter to determine whether the record is included in the set. When the record is determined not to be included in the set, a message is provided to indicate that the domain name system includes a new record, and the common filter is updated to include the data point in the set.

The invention discloses a power windowing sending method applicable to UFMC (universal filtered multicarrier) waveforms. The method includes: firstly, a sending end sets sub-bands requiring filtering in a frequency domain according to system requirements, wherein the sub-bands are formed by adjacent sub-carriers; secondly, each sub-band is subjected to N-point Fourier inverse transformation to a time domain; thirdly, the sending end multiplies power of a time domain signal of each sub-band by a window function being N in length; finally, generated signals are processed by a filter to form UFMC baseband signals which are modulated to a carrier frequency prior to being sent.

The invention discloses an interception agent for reducing the phenol content in cigarette smoke, which is prepared by blending water, glycerol and essence in a volume ratio of 2.5:(1.2-5):(0.1-0.125), stirring and evenly mixing the mixture. The invention further discloses a filter stick provided with the interception agent, which is prepared by the following steps: (1), adopting a preparation technology for an officinal capsule, taking the interception agent as the capsule core material and wrapping the agent inside the capsule; and (2), applying one or more capsules in fixed positions in a shred forming process, applying a universal filter stick forming technology , and obtaining the filter stick formed once and provided with a total addition quantity of the interception agent ranging from 0.01 mg to 0.5 mg. The interception agent and the filter stick can reduce the phenol content in the cigarette smoke remarkably, improve the cigarette smoke moisture simultaneously, enhance the moist feeling of the smoke, improve the quantity and the quality of the smoke, and endow the smoke with special aroma and smoking flavor, and have the advantages of simple formula, wide raw material source and low cost.

The invention provides a multi-band parallel filtering type hybrid carrier transmission method and belongs to the field of multi-carrier transmission. The method solves the problems in the prior art that due to the fact that when an inverse filter is performed at the receiving end of an existing universal filtering multi-carrier system, the noise on each sub-carrier at the edge of a sub-band is amplified, so that the error rate is increased and the peak-to-average power ratio of the existing universal filtering multi-carrier system is too high. To-be-transmitted baseband data are divided into K sub-bands by a transmitting end, and the data of sub-bands of at least one access are pre-coded and then converted to a time domain. A receiving end converts the baseband data after down-conversion from the time domain to the frequency domain, and then the data of each sub-band of the transmitting end are recovered. After that, the data of each sub-band of the transmitting end also need to be subjected to inverse pre-coding. The pre-coding is used for transmitting the data of sub-bands in a single-carrier mode, and is also used for converting the data of sub-bands from the time domain to the frequency domain. The inverse pre-coding is used for converting the symbol decision position of the data of each sub-band from the frequency domain to the time domain. The method is mainly used for multi-band parallel filtering type transmission.

In an embodiment, a computer-implemented method detects updates to a domain name system record system. In the method, a stream of data points is received with each data point describing a record of a domain name system. For respective data points, a processor is selected from a plurality of processors. The processors are each configured to apply a data point against a common filter that assesses whether the data point is in a set. At the selected processor, the respective data point is applied to the common filter to determine whether the record is included in the set. When the record is determined not to be included in the set, a message is provided to indicate that the domain name system includes a new record, and the common filter is updated to include the data point in the set.

The invention provides a video image deblocking filter method and a video image deblocking filter device. According to the method, a video or image frame is divided into a plurality of 16*16 macro blocks, and each macro block is divided into 16 4*4 subblocks. The method comprises the following steps of: reading the pixel data of the current macro blocks from a first storage device and a second storage device to a specified buffer group according to the instruction information described by a control vector when the pixel data of the current macro blocks is read; and executing operations of determining the number of corresponding subblocks, calculating the filter strength, determining the filter type, performing filtering operation processing and performing data write-back processing according to the instruction information described by the control vector in the process of executing filtering processing of each current subblock. The essence is that the universal filtering processing operation on different coding and decoding standards is executed according to the instruction information described by the universal control vector in a control table. According to the video image deblocking filter method and the video image deblocking filter device, standard deblocking filter processing can be performed on different videos, the universality is high, and the filtering speed is increased.

The invention discloses a synchronous symbol design method applicable to a UFMC (Universal Filtered Multi-Carrier) waveform. The method comprises the following steps: S1, generating a time domain sequence A having the length (N-L) / 2, and then adding L zeros behind to form a B sequence having the length (N+L) / 2; S2, duplicating the B sequence, then putting the duplicated sequence behind the B sequence to form front and back halves of equal synchronous symbols, and sending the synchronous symbols via a filter; S3, a receiving end converting received signals down to a baseband, and storing the signals; S4, taking the i sampling point of the received signals as a starting point, sampling (N+L) / 2 sampling points behind, and saving the sampling points as a row vector V1; S5, taking the (i+(N+L) / 2) sampling point of the received signals as a starting point, sampling (N+L) / 2 sampling points behind, and saving the sampling points as a row vector V2; S6, calculating the result of V1V2<H>, and obtaining module values rhoi; and S7, comparing the value of each rhoi in an observation window, and selecting the sampling position corresponding to the maximum as the starting position of the UFMC symbols. The synchronous symbol design method can be applied to a UFMC waveform technology which may be adopted in next generation communication system, and does not need to change the existing communication system and standard.

The invention concerns a method for conditioning a multicarrier transmit signal using a first or a second set of subgroups of time-frequency resource elements, with a subgroup of the first set of subgroups and a subgroup of the second set of subgroups having common time or frequency resources and being neighboured in time or frequency, wherein a first filter module (FILT1) filters the first set of subgroups using a first filter characteristic by a first set of filter coefficients, and a second filter module (FILT2) filters the second set of subgroups using a second filter characteristic by a second set of filter coefficients, and a base station and a transmitter apparatus (TA) therefor.

The invention discloses a universal filter element structure for water purification equipment and belongs to the technical field of water purification equipment. The universal filter element structurecomprises a moving device, the rear surface of a first stop block of the movable device is fixedly connected with the front end of the annular face of the movable cover, a third circular groove is provided with a filter screen for preventing activated carbon from leaking downwards, so that water can be purified for the first time, the movable cover is rotated to enable the first stop block to rotate to a square groove, the movable cover can be pulled out from a second circular groove, so that the invalid activated carbon can be conveniently poured out for replacement, after the replacement isfinished, a baffle block I is aligned with the square groove and is pressed down, the movable cover is rotated, a semicircular block is extruded to push the movable block to downwards compress a spring, so that the movable cover is not easy to fall off, water purified by the activated carbon for the first time flows to the third cylinder below through the second cylinder, a transverse block is clamped on the upper surface of a third stop block through rotation and is prevented from falling off, a fifth stop block and a clamping groove are staggered at the moment, so that the upper filter device and the lower filter device are further prevented from falling off, and compared with a common filter element replacement mode, the saving mode is simple, and the use cost is reduced.

A complimentary single-ended-input OTA-C universal filter structures in terms of integrated circuits is provided. The integrated circuit comprises a plurality of amplifiers and a plurality of capacitors. In some capacitors, one electrode is electrically connected to the positive input of its corresponding amplifier, and the other electrode can be electrically connected to an electrical source. In addition, the negative input of one amplifier is electrically connected to the negative input of another amplifier. Besides, there are a head amplifier and a tail amplifier. The output of the head amplifier is electrically connected to the negative input of the head amplifier, and the positive input of the tail amplifier can be electrically connected to an electrical source.

The invention provides a selective mapping-based universal filtering multi-carrier method, which comprises the following steps: dividing a sub carrier into B sub bands, extending each sub band into Udifferent candidate sub bands, multiplying each of the candidate sub bands with a group of randomly generated twiddle factors, filtering the sub carrier of each sub band with an FIR filter, selectingone sub band with the minimum peak-to-average power ratio (PAPR) from the sub bands of a sending end for transmission, superposing transmission signals, in a time domain, in the B sub bands selected from the sub bands to form a new sending signal, performing fast Fourier transform on received signals, removing an interference signal, directly recovering the sending signal from the received signalsthrough a linear equalization method, and performing twiddle factor reversing operation on an equalized signal to reconstruct an original sending signal. The PAPR performance of the selective mapping-based universal filtering multi-carrier method is effectively improved, and the selective mapping-based universal filtering multi-carrier method has a certain engineering application value.

A complimentary single-ended-input OTA-C universal filter structures in terms of integrated circuits is provided. The integrated circuit comprises a plurality of amplifiers and a plurality of capacitors. In some capacitors, one electrode is electrically connected to the positive input of its corresponding amplifier, and the other electrode can be electrically connected to an electrical source. In addition, the negative input of one amplifier is electrically connected to the negative input of another amplifier. Besides, there are a head amplifier and a tail amplifier. The output of the head amplifier is electrically connected to the negative input of the head amplifier, and the positive input of the tail amplifier can be electrically connected to an electrical source.

The present invention provides a thick and fine smoke filter cigarette holder, which includes a cigarette holder body, the cigarette holder body includes a smoke return pipe, a filter pipe, a filter, a top cover, and the smoke return pipe, filter pipe, filter and The top cover is sequentially connected with the inside to form a connected cavity. The flue gas return pipe is provided with a ventilation sheet, the ventilation sheet is provided with an air inlet, the filter tube is provided with a hole for placing a thick cigarette holder, and the filter is provided with a hole for placing a thin cigarette holder. The setting of the hole for placing the thick and thin cigarette holder meets the needs of cigarettes of different thicknesses and improves the use value. At the same time, the setting of the air inlet hole allows the air to enter the cigarette holder and mix with the smoke, thereby converting part of the carbon monoxide in the smoke into carbon dioxide and reducing the user's fatigue. Inhalation of carbon monoxide.

The invention particularly relates to a universal filtering shower head with an inductive switch. The universal filtering shower head with the inductive switch comprises a handle part, a connecting part, a shower head part and a control switch; the two ends of the connecting part are correspondingly connected with the handle part and the shower head part; the connecting part is a double-layer universal joint; the shower head part comprises a filtering element; and the control switch comprises a main discharge valve and the inductive switch. According to the universal filtering shower head withthe inductive switch, with the adoption of the filtering element, the filtering effect is good; with the adoption of a universal connector, the water spraying directions can be adjusted convenientlyand freely; and with the adoption of the inductive switch, water can be discharged automatically through induction, and the universal filtering shower head is more water-saving and energy-saving.

The invention discloses a self-cleaning universal filtering device, which comprises a filtering box body, the filtering box body is provided with an air inlet pipe for waste gas to enter and an air outlet pipe for filtered gas to be discharged, the device also comprises a filtering barrel which is arranged in the filtering box body, wherein the filtering barrel is of a hollow structure with an opening in one end, the filtering barrel comprises a back-flushing air pipe arranged inside and a metal filtering structure arranged outside the back-flushing air pipe, an air inlet cavity communicated with the air inlet pipe and an air outlet cavity communicated with the air outlet pipe are formed in the filtering box body, an opening in one end of the filtering barrel is communicated with the air outlet cavity, and the metal filtering structure is located in the air inlet cavity. The filtering structure can be in contact with an internal backflushing gas pipe, the backflushing effect is good, waste gas containing oil and water can be filtered, and accumulated ash is efficiently removed. One group of filtering structures are arranged side by side, one filtering structure is closed for backflushing cleaning, other filtering structures operate normally, and the filtering structures do not need to be taken out and production does not need to be stopped during cleaning.

The invention relates to water treatment, and provides a universal water filtering device and water purification transverse rod water filtering faucet. The faucet comprises a faucet body, a hot and cold filter element, a direct drinking filter element, a first shell, a second shell, a three-inlet and two-outlet valve and a universal water outlet hose; the first shell comprise a left shell and a right shell which are detachably connected in a sealed mode; the end, connected to the faucet body, of the left shell is provided with a water inlet flow channel, and the end, away from the three-inletand two-outlet valve, of a second water outlet channel communicates with the water inlet flow channel of the left shell; the direct drinking filter element is detachably arranged in an accommodating cavity formed by the left shell and the right shell in a penetrating mode; a water inlet of the direct drinking filtering element is detachably connected with the water inlet flow channel of the left shell; the end of the free end of the right shell extends outwards to form a hollow positioning ring matched with the end, away from the universal water outlet hose, of the second shell; and the end, away from the universal water outlet hose, of the second shell is detachably embedded in the hollow positioning ring of the right shell. The problems of complex structure, inconvenient application andhigh manufacturing cost of existing water purification faucets are solved.

The invention provides a universal wall-hanging stove filter, and belongs to the technical field of filters. The problem that an existing universal filter is poor in safety is solved. The universal wall-hanging stove filter comprises a shell and a three-way connector, a filter element assembly is arranged in the shell, the shell is provided with a water passing end right facing the filter element assembly, the three-way connector is connected to the water passing end, an inner pipe extending towards the interior of the water passing end is arranged in the three-way connector, the three-way connector and the water passing end are sealed in the circumferential direction, the inner pipe extends into the water passing end, and an axially-fixed clamping structure is arranged between the inner pipe and the inner wall of the shell. According to the design, the fixing position between the three-way connector and the shell is hidden in the water passing end, so that outside people cannot be in contact with the fixing position, the possibility of accidental manual opening does not exist, and the safety of the filter is improved.

An embodiment of the invention discloses a signal processing method, receiving terminal equipment and transmitting terminal equipment to improve flexibility of a narrow-band interference inhibition method. The method includes: a receiving terminal acquires first signals, wherein the first signals are signals transmitted in sub-bands within a receiving range of the receiving terminal and are signals in a UFMC (universal filtered multicarrier) waveform, and the sub-bands no less than two are obtained by splitting of preset wideband channels; the receiving terminal filters the first signals to obtain second signals; the receiving terminal subjects the second signals to AGC (automatic gain control) adjustment to obtain third signals; the receiving terminal judges whether the third signals meet preset conditions or not; if yes, the receiving terminal confirms that the third signals are free of interference; if not, the receiving terminal sends instructions to a transmitting terminal, wherein the transmitting terminal is a device which sends the first signals, and the instructions are used for indicating that the receiving terminal fails to complete filtering of interferences caused to the first signals. Consequently, flexibility of the narrow-band interference inhibition method can be improved.

The invention discloses a general purpose filter multicarrier system based on non-orthogonal multiple access, comprising a transmitter and a receiver. At atransmit end, each user simultaneously occupiestwo sub-bands for information transmission, namely, signals of two users are simultaneously transmit on the same sub-band; at areceiving end, the received signals of all users in frequency domain are equalized simultaneously by the parallel interference cancellation technology to recover the original data information sent by all users. Compared with the prior universal filter multicarrier system, the invention can fully realize the frequency diversity gain of the channel bandwidth, and has the advantages of excellent performance, low time delay and the like.