42 results about "Frequency compression" patented technology

A system and method are provided for improving the quality and intelligibility of speech signals. The system and method apply frequency compression to the higher frequency components of speech signals while leaving lower frequency components substantially unchanged. This preserves higher frequency information related to consonants which is typically lost to filtering and bandpass constraints. This information is preserved without significantly altering the fundamental pitch of the speech signal so that when the speech signal is reproduced its overall tone qualities are preserved. The system and method further apply frequency expansion to speech signals. Like the compression, only the upper frequencies of a received speech signal are expanded. When the frequency expansion is applied to a speech signal that has been compressed according to the invention, the speech signal is substantially returned to its pre-compressed state. However, frequency compression according to the invention provides improved intelligibility even when the speech signal is not subsequently re-expanded. Likewise, speech signals may be expanded even though the original signal was not compressed, without significant degradation of the speech signal quality. Thus, a transmitter may include the system for applying high frequency compression without regard to whether a receiver will be capable of re-expanding the signal. Likewise, a receiver may expand a received speech signal without regard to whether the signal was previously compressed.

The invention relates to one visual frequency compression codes macro block coding mode selection method, which comprises the following steps: predicting move and processing rapid speed and lose estimation after exchange and volume; during computation, processing exchange parameters as zero; in speed estimation computation, establishing non-zero parameters sum, and number and journey sum and relation module; defining one index function to meter non-zero parameter number and journey sum impact on speed with each real code for one block to update index list according to low pass filter; according to speed and aberration estimation to process macro coding module selection.

The invention discloses a time-frequency diagram processing method and system for mechanical equipment monitoring vibration signals. The time-frequency diagram processing method comprises the steps that firstly, linear or bilinear time-frequency transformation is carried out on collected mechanical equipment monitoring vibration signals to obtain a time-frequency diagram TFRs, and average threshold processing is carried out on the time-frequency diagram TFRs to obtain a sparse time-frequency diagram STFRs; secondly, time-frequency compression sampling is carried out on the STFRs in a random sampling mode to obtain a matrix M<STFR > with dimensionality being k times the dimensionality of an original matrix; thirdly, the parallel class FISTA proximal decomposition method is used for reconstructing an STFRs* through iterative computation. The time-frequency diagram processing system comprises a monitoring front-end machine and a server connected with the monitoring front-end machine. The monitoring front-end machine comprises an A/D data collection module, a time-frequency transformation module, an average thresholding module and a time-frequency compression sampling module and is connected with a vibration sensor. The server comprises an on-line data storage module and a reconstruction algorithm module. According to the time-frequency diagram processing method and system, the dimensionality of the reconstructed time-frequency diagram is greatly reduced, data storage and transmission are facilitated, and time-frequency analysis technology can be widely applied for mechanical equipment fault real-time quantitative analysis and diagnosis.

The invention discloses a digital hearing aid loudness compensation method based on frequency compression and movement, which belongs to the technical field of voice signal processing. The digital hearing aid loudness compensation method comprises the following steps of: filtering, and extracting the low-frequency part and the high-frequency part of a signal; compressing and moving the voice high-frequency part according to proportion; simulating a voice signal heard by a patient; designing a four-channel FIR-QMFB (Quadrature Mirror Filter Banks); dividing a frequency range; and carrying out loudness compensation and gain control; and combining voice. The digital hearing aid loudness compensation method is characterized in that the original voice signal is divided into low frequency and high frequency, then, the high-frequency part is compressed and moved to a medium and low frequency range according to proportion, and the overlaid voice signal is subjected to frequency band division and loudness compensation according to a hearing test curve of a hearing impairment patient. Therefore, negative effects brought by carrying out high-gain loudness compensation on the high frequency range in the prior art can be effectively avoided, and the hearing level and the language recognition rate of the patient can be effectively improved.

The invention puts forward the predicting method by combining correlation of motion vector between time domain and space domain as well as the method for describing movement correlation between adjacent macro blocks. The method includes following steps. A video camera converts the state of a target object to video frequency signal. The said video signal through an acquisition card is converted to a digital video frequency sequence stored in a flash memory to be used as input from system for further compression. The computer runs motion compensation/DCT mixed coded subroutine for original video frequency frames for carrying out video frequency compression and creating code stream file. The main point of the invention is the subrouting for predicting motion vector.

A hearing aid-style anti-stuttering device, with a throat microphone to pick up the user's voice while rejecting background noise, and an FM wireless transmitter from the throat microphone to the hearing aid-style anti-stuttering device; or bonded to a tooth in the user's mouth, with sound transmitted via the user's skull to his or her ears; and providing frequency compression to shift the user's voice to a lower frequency in the user's ear, while minimizing loss of audio signal due to the 200 Hz low-frequency cutoff inherent in hearing aids; or with octave-scale, acoustically transparent frequency shifting.

The invention discloses a node data transmitting method of a sensor network and relates to the technical field of a wireless sensor network, wherein the sensor network totally comprises nw network nodes. The method comprises the following steps of: S1: acquiring the node data xj of the nw network nodes in the sensor network; S2: compressing the node data xj of each network node by using a preset random compression matrix to obtain the node compression data tj transmitted by each network node every time, and carrying out transmission frequency compression on the network data formed by tj to obtain mw data, wherein i is equal to 1, 2,..., mw and represents i times of transmission, and wm is less than nw; and S3: transmitting the compression data of the nw network nodes to a fusion center through mw times of transmission. In the fusion center, the data xj originally acquired by each sensor is recovered by a node data reconfiguring method of the sensor network. According to the invention, the quantity of data transmitted and processed in the sensor network can be reduced.

The invention relates to a system and a method for defrosting without stopping a heat-pump air conditioner. The system comprises a compressor, a four-way reversing valve, an indoor heat exchanger, a throttling device, an outdoor heat exchanger and a heat storage module which are sequentially connected through a pipeline to form a circulation loop, wherein the heat storage module comprises a phase-change heat storage material, PTC electrical heating rods, a PTC electrical heating rod temperature control circuit, a refrigerant pipeline and a PTC temperature control system; and the PTC temperature control system is used for setting the heating temperature and controlling the overload temperature. Based on the variable-frequency compression technology, the system and the method provided by the invention are combined with the phase-change heat storage technology and the PTC electrical heating technology, so that waste heat of the compressor can be recycled and the defrosting efficiency can be improved; meanwhile, defrosting can be achieved without stopping the heat-pump air conditioner; and the heating efficiency can be improved by increasing the temperature at an air return port of the compressor.

The invention provides a scene recognition method based on an intelligent mobile terminal. A frequency compression demodulator (FCD) rapid corner point is used for detecting and achieving extraction of image feature points, efficiency of a feature point detecting algorithm is improved, and the defect that calculating capacity of the mobile terminal is poor can be effectively overcome. Through a K-means algorithm, a plurality of pre-set class centers are generated, each class center is used as a visual word and used for a generating method of a follow-up image descriptor, and a limited memory space of the mobile terminal is enabled to achieve large-scaled scene recognition. Further, image descriptors saved in an image data base are clustered through a mean-shift method, the plurality of pre-set class centers are generated, the descriptors input to the images are inserted into one of the plurality of pre-set class centers according the closest distance, a vector distance is calculated, sequence is carried out according to the shortest distance, a method which is used for sequencing first images to be selected by a user is found, and high-efficient quick index of a recognition scene is achieved.

The invention discloses an active radio frequency identification device (RFID) positioning card reader based on a micro-strip secondary array narrow-angle directing antenna array of directing antenna array positioning. The active RFID positioning card reader comprises an antenna and a card reading processing device, wherein the antenna and the card reading processing device are in signal connection, and the antenna is the micro-strip secondary array antenna array. The micro-strip secondary array antenna array is divided into a plurality of narrow solid angle micro-strip array narrow-angle directing antennas, and the plurality of narrow solid angle micro-strip array narrow-angle directing antennas is used for receiving an active RFID card signal of ultrahigh frequency carrier high frequency compression sent information carried by an ambulatory human or a low-speed moving object to carry out positioning card reading. The active RFID positioning card reader is suitable for carrying out the positioning card reading on an active RFID card which is capable of sending information with moderate transmitted power and an ultrahigh frequency carrier in a higher frequency compression mode in a certain range of space. A single active RFID positioning card reader is used, direction and corresponding position of the RFID card in a certain area can be confirmed, and more than two positioning card readers are used to read a card in a networking cross mode, the position of the active RFID card can be confirmed accurately, or a range of positioning card reading can be expanded.

The invention provides a cascade type high-temperature heat pump steam generator, and relates to the high-temperature heat pump technology. The steam generator comprises a low-temperature stage circulation system, a high-temperature stage circulation system and a middle heat exchange device, and is further provided with a water supply preheating and heating system, and the water supply preheatingand heating system comprises a water supply preheater, a water storage tank, a water pump and an electromagnetic oven heater; the inlet end of a circulating working medium of the water supply preheater is connected with a low-temperature stage compressor in the low-temperature stage circulation system, the outlet end of thecirculating working medium of the water supply preheater is connected witha low-temperature stage liquid storage tank, the water inlet end of the water supply preheater is connected with the water storage tank through the water pump, the water outlet end of the water supplypreheater is connected with the water inlet end of a condenser, and the water outlet end of the condenser is connected with the electromagnetic oven heater. According to the steam generator, a preheating water supply mode, a heat pump system, cascade type circulation and the variable frequency compression technology are organically combined, an environment-friendly and feasible circulation process is designed and provided, and the heat economic benefit of the cascade heat pump system is improved.

The invention discloses a heat pipe and steam compression compound type base station energy-saving air conditioner, which is provided with a heat pipe system, a steam variable-frequency compression refrigeration circulating system and a control system, wherein the heat pipe system comprises a heat pipe condenser, a first electric stop valve, a heat pipe evaporator and a second electric stop valve which are sequentially connected to form a loop through pipelines, the variable-frequency compression refrigeration circulating system comprises a condenser, a variable-frequency compressor, an evaporator, a thermal expansion valve and a liquid storage tank which are sequentially connected to form a loop through pipelines, the heat pipe evaporator and the evaporator form an integral indoor heat exchanger, the heat pipe condenser and the condenser form an integral outdoor heat exchanger machine, the control system is connected with an indoor temperature sensor and an outdoor temperature sensor through data wires, and simultaneously control the heat pipe system and the steam variable-frequency compression refrigeration circulating system, the heat pipe condenser and the heat pipe evaporator are in inclined installation, an included angle is formed between the heat pipe condenser and the condenser, and an included angle is formed between the heat pipe evaporator and the evaporator. Outdoor cold sources can be fully utilized, the energy-saving operation of units is realized, and the refrigeration circulation efficiency is high.

The invention provides a time-frequency compression multi-carrier transmitting method, a time-frequency compression multi-carrier receiving method, a transmitter and a receiver. The method comprises the following steps: carrying out modulation transformation on an input binary bit sequence to obtain a modulation symbol sequence transmitted by subcarriers, carrying out orthogonal transformation toobtain a data sequence transmitted by each subcarrier, carrying out Fourier transformation to obtain a first signal sequence, and expanding the first signal sequence into a second signal sequence; generating an FTN time domain compression frequency domain window coefficient according to the frequency domain impulse response of the shaping filter; windowing the second signal sequence by using the coefficient and performing FTN frequency domain compression operation to obtain a third signal sequence; and carrying out inverse discrete Fourier transform to obtain a fourth signal sequence, and increasing a guard interval to obtain an output signal sequence. The problems that time-frequency two-dimensional compression and ISI\ ICI elimination in a multi-carrier system cannot be flexibly and efficiently achieved and the detection complexity is high are solved, data are accurately transmitted, time-frequency two-dimensional compression and ISI\ ICI elimination in the multi-carrier system are flexible and efficient, and the detection complexity is reduced.

A video playback device of decoding encoded video data is additionally provided with a compression circuit and a decompression circuit in an existing encoded video decoding circuit. In the compression circuit, a frequency transform circuit transforms played-back video data obtained from the encoded video decoding circuit into frequency coefficient data, which is in turn subjected to IDCT having a reduced order in a frequency compression circuit to obtain compressed video data. The compressed video data, which is image space data having a reduced image size, is stored in a frame memory. The decompression circuit comprises a frequency decompression circuit and an inverse frequency transform circuit which performs a process inverse to that of the compression circuit. The compressed video data from the frame memory is converted by a video output circuit into data which can be displayed, and the resultant data is output to a video display device. Therefore, the additional components are provided while the existing device is used as it is, thereby reducing the size of a frame memory.

The invention relates to a fault feature extraction method of weak transient zero-sequence current on the background of strong noise. The method comprises the following steps: firstly, transient frequency compression ratio CR is determined, compressive sampling frequency fsc is determined based on the CR, and compression numerical value is determined according to the fsc so as to calculate step length hsc, wherein numerical range of the CR is 1000-2000; secondly, transient zero-sequence current izy(t) under the background of strong noise is input into a bistable system, numerical calculation of the bistable system is carried out by a fourth-order Runge-Kutta method, and an output signal is is(t); thirdly, an initial period of the is(t) is extracted as a characteristic signal ic(t); and finally, a cross correlation coefficient pcz between the characteristic signal ic(t) and an initial period izo(t) of noise-free transient zero-sequence current is calculated, and fault feature extraction of the transient zero-sequence current is finished if the pcz is greater than or equal to 0.7; and if the pcz is less than 0.7, the CR is adjusted until the pcz is greater than or equal to 0.7, so as to finish fault feature extraction of the transient zero-sequence current.

The invention is a compression encoding method that is based on three dimension wavelet transform Shift-set partition in Hierarchical Trees based on time domain multi wavelet basis. It is improvement for video image three dimension wavelet transform compression encoding system. Considering real-time of video process, storage capacity of system, statistic characteristics of coefficient and Spiht encoding algorithm after wavelet transform, the invention introduces a method that is to further utilize time dependency of the video flow and to divide the video flow into OFG and RFG that is taken as encoding unit for processing. Meanwhile the time domain adopts the method combining Haar wavelet basis and Daubechies 9/7 wavelet basis.

The invention relates to a defrosting system and method for a heat pump type air conditioner. The defrosting system comprises a compressor, a four-way directional valve, an indoor heat exchanger, a throttling device, an outdoor heat exchanger and a heat storage module which are sequentially connected through a pipeline to form a circulating loop; the heat storage module comprises a phase-change heat storage material, a PTC electric heating rod, a temperature control circuit of the PTC electric heating rod, a refrigerating agent pipeline and a PTC temperature control system; and the PTC temperature control system is used for setting a heating temperature and controlling an overload temperature. According to the defrosting system and method for the heat pump type air conditioner, a variable-frequency compression technology is combined with a phase-change heat storage technology and a PTC electric heating technology for recycling waste heat of the compressor, so that defrosting efficiency is improved; and meanwhile, defrosting can be realized, and temperature of a gas return hole of the compressor is increased, so that heating efficiency is improved.

The aim of the invention is to reduce the risk of feedback artifacts in a communication system comprising a telephone device (10) and a listening device (11). According to the invention, a communication system is thus provided, in which the signal processing in the telephone device (10) is tuned to the listening device (11) and the listening device (11) is designed to process the voice and data signal inversely to the signal processing. Before the acoustic signal is transmitted from a telephone to a listening unit, a frequency compression can thus be carried out, and in the listening unit an inverse frequency compression can be carried out. This reduces feedback artifacts.

After making motion estimation, motion compensation, DCT transformation and quantization, and entropy coding for input video data at transmission end, the video data is sent to reception end and is mad a reversing process at reception end to recover the video data. The method also includes following steps: the image is divided into foreground image and background image that are identified as foreground macro block and background macro block; the quantify parameter (QP) of current foreground macro block and background macro block is made quantization step regulation.

Artifacts occurring during frequency compression, in particular in the case of hearing aids, are avoided or reduced. The method comprises the frequency of an audio signal having a fundamental frequency and at least one harmonic (30). The audio signal is provided in a plurality of frequency channels (31, 32). The harmonic of the audio signal is shifted or mapped (33) from a first frequency channel (31) of the plurality of frequency channels into a second frequency channel (32). In addition a frequency which is likewise harmonic with respect to the fundamental frequency is estimated in the second frequency channel, the harmonic being shifted or mapped onto the estimated frequency. As a result the harmonic pattern is preserved in the compressed signal and the artifacts are reduced.

The invention belongs to the technical field of sound equipment, and particularly relates to a medium-high frequency composite waveguide horn device which comprises a high-frequency composite waveguide mechanism and medium-frequency compression waveguide mechanisms symmetrically arranged on the two sides of the high-frequency composite waveguide mechanism. The high-frequency composite waveguide mechanism comprises a sound amplification waveguide and a tweeter; the sound amplification waveguide is provided with at least two sound amplification cavities in a penetrating manner, two ends of each sound amplification cavity respectively form a sound outlet and a sound inlet at the front end and the rear end of the sound amplification waveguide, and the sound amplification cavities are gradually enlarged from one end of the sound inlet to one end of the sound outlet; sound inlets of the two sound amplification cavities are respectively provided with a tweeter; the intermediate-frequency compression waveguide mechanism comprises a compression waveguide and an alto horn; the compression waveguide is provided with at least one sound wave compression channel in a penetrating manner, two ends of the sound wave compression channel respectively form a leading-out port and a leading-in port at the front end and the rear end of the compression waveguide, and the width of the sound wave compression channel is reduced from one end of the leading-in port to one end of the leading-in port; the leading-in port is provided with an alto horn; the two sound outlets and the two lead-out ports face the same direction.

The invention discloses a high-pitch horn with a phase plug. The high-pitch horn comprises an inverted-circular-truncated-cone-shaped high-pitch horn and an inverted-cone-shaped phase plug installed in the high-pitch horn. The inner side surface of the high-pitch horn is matched with the side surface of the phase plug; a high-frequency compression driver is arranged at the bottom of the high-pitchhorn, a plurality of positioning nails are evenly distributed on the inner circumferential wall of the high-pitch horn, positioning holes corresponding to the positioning nails are formed in the outer circumferential wall of the phase plug, and notches which are symmetrical left and right are formed in the left side and the right side of the upper portion of the phase plug. The high-frequency compression driver and the high-pitch horn do not generate sound wave resonance, sound waves do not interfere with each other, acoustic paths reaching an outlet are equal, fluctuation of a frequency response curve is small, standing waves and crossover distortion are small, off-axis frequency response diffusion characteristics and axial frequency response diffusion characteristics are smooth, and thehigh-pitch effect is good.