195 results about "Bandwidth expansion" patented technology

A novel bandwidth extension technique allows information to be encoded and decoded using a fractal self similarity model or an accurate spectral replacement model, or both. Also a multi-band temporal amplitude coding technique, useful as an enhancement to any coding / decoding technique, helps with accurate reconstruction of the temporal envelope and employs a utility filterbank. A perceptual coder using a comodulation masking release model, operating typically with more conventional perceptual coders, makes the perceptual model more accurate and hence increases the efficiency of the overall perceptual coder.

A communications system includes a multiple-input / multiple-output (MIMO) architecture for high capacity switched mesh networks. The MIMO architecture has a plurality of radio frequency chains. One of the plurality of radio frequency chains is configured to apply a first frequency offset to a base frequency of an output signal to generate a first transmitting frequency; and another of the plurality of radio frequency chains being configured to apply a second frequency offset to the base frequency to generate a second transmitting frequency. The system uses the carrier frequency offset to lock the clock of the master subsystem to the clock of the slave subsystem, thereby enabling bandwidth expansion to be employed on the MIMO data streams.

The invention provides audio bandwidth expansion coding and decoding devices which can reconstruct a high frequency signal by using the lower code rate so as to improve the quality of the output audio signal. The audio bandwidth expansion coding device comprises a frequency division module, a core coder module, a linear prediction analysis module, a spectrum envelope quantization module, a high and low frequency correlation computation module and a gain computation module; and the audio bandwidth expansion decoding device comprises a core decoder module, a high-frequency spectrum envelope reconstruction module, a high-frequency residual error reconstruction module, a high-frequency gain adjustment module, a high-frequency signal synthesis module and a wideband signal reconstruction module.

Aspects of the present disclosure relate to methods and apparatus for bandwidth expansion in channel co-existence situations. An example method generally includes determining information regarding loading of at least one of downlink (DL) or uplink (UL traffic at a first base station that can share at least some bandwidth with at least one neighbor base station, and modifying bandwidth of one or more channels used by the first base station based, at least in part, on the loading information.

Systems and methods for flexible spectrum, or bandwidth, support in a cellular communications network are disclosed. In one embodiment, a base station for a cellular communications network is configured to transmit a non-standardized bandwidth carrier and information that identifies a standardized bandwidth and additional information that, together with the information that identifies the standardized bandwidth, defines a non-standardized bandwidth of the non-standardized bandwidth carrier. In one embodiment, the additional information defines a bandwidth adjustment for the standardized bandwidth that defines the non-standardized bandwidth. In one embodiment, the bandwidth adjustment is a symmetric bandwidth restriction. In another embodiment, the bandwidth adjustment is an asymmetric bandwidth restriction. In yet another embodiment, the bandwidth adjustment is a symmetric bandwidth expansion. In yet another embodiment, the bandwidth adjustment is an asymmetric bandwidth expansion.

Techniques for applying artificial bandwidth expansion to a multichannel signal are described. Aspects of a system for applying artificial bandwidth expansion to a multichannel signal include an estimation component for receiving a multichannel signal and estimating delay and energy level differences for each channel of the multichannel signal. An artificial bandwidth expansion component artificially expands the bandwidth of each of the channels of the multichannel signal separately. Each one of a plurality of adjustment components are configured to modify a different one of the artificial bandwidth expanded channels of the multichannel signal based upon the estimated delay and energy level differences. The multichannel signal may be a binaural speech signal.

A Channel State Information (CSI) request / feedback method and apparatus for a wireless communication system supporting carrier aggregation or bandwidth extension are provided. A base station sets a CSI request field of an Uplink (UL) grant for scheduling UL transmission on a UL Component Carrier (CC) corresponding to a Downlink (DL) CC of which CSI is requested, to a request value. The UL grant is transmitted to a terminal.

A signal bandwidth expanding apparatus configured to expand a bandwidth of an input signal. The apparatus includes: a time acquiring section configured to acquire time information; a priority holding section configured to hold priority information of processes, each process divided from a process of bandwidth expansion; a controller configured to: sequentially perform the processes from a process having a higher priority using the priority information held by the priority holding section, calculate a time taken for the process using the time acquiring section when the process is ended, and control whether or not a next process having a secondary priority is performed according to the time taken for the process; and a frequency balance correcting section configured to change a frequency characteristic of a signal expanded in a bandwidth according to the process performed by the controller.

Disclosed is a speech receiving apparatus. A low-band PLC module and a synthesis filter reconstructs a low-band speech signal of a lost frame from a previous good frame. A high-band PLC module reconstructs a high-band speech signal of the lost frame from the previous good frame. A transforming part transforms the low-band speech signal into a frequency range. A bandwidth extending part generates at least an extended MDCT coefficient as information for the high-band speech signal from the low-band speech signal transformed by the transforming part. A smoothing part smoothes the extended MDCT coefficient. An inverse transforming part inversely transforms the extended MDCT coefficient smoothed by the smoothing part to a time domain. A synthesizing part synthesizes the low-band speech signal, and the high-band speech signal which is inverse-transformed by the inverse transforming part and reconstructed, to output a wideband speech signal.

The invention relates to a base station antenna and a dual polarized antenna oscillator thereof. The dual polarized antenna oscillator comprises a radiation piece and a loading branch, wherein the surface of the radiation piece is provided with a hollow part. The dual polarized antenna oscillator has the beneficial effects that: when a feeding network is adopted to feed the radiation piece, a capacitance effect is formed between a tail end of the loading branch and the feeding network, and the capacitance effect is focused on a low frequency end of an operating frequency band; in addition, a capacitance parameter is connected in parallel with an input impedance parameter of the radiation piece, thus the operating frequency band expands towards the lower frequency band; moreover, the hollowpart is beneficial to bandwidth expansion towards a high frequency band, in this way, under the function of the loading branch and the hollow part, the dual polarized antenna oscillator can achieve wide frequency band coverage with one layer of radiation piece, thus the dual polarized antenna oscillator is simple in structure and low in section, and therefore, when the dual polarized antenna oscillator is applied to the base station antenna, miniaturization of the base station antenna can be facilitated.

The invention discloses an FPGA (field programmable gate array)-based permanent magnet synchronous motor current loop bandwidth expansion device. The device comprises a current sampling module, a Clark conversion module, a Park conversion module, a PI (proportional-integral) module, an iPark conversion module, an SVPWM (space vector pulse width modulation) module and a time sequence control module, wherein the current sampling module is used for reading current sampling values ia and ib of a phase A and a phase B; the Clark conversion module is used for converting the ia and the ib into an alpha-beta coordinate system to obtain ialpha and ibeta, the Park conversion module is used for converting the ialpha and the ibeta into a d-q coordinate system to obtain a direct axis current id and a quadrature axis current iq; the PI module is used for comparing a command current with feedback currents id and iq to obtain a current deviation value, and computing to obtain command voltages Vd and Vq in the d-axis and the q-axis; the iPark conversion module is used for converting the Vd and the Vq into an alpha-beta coordinate system to obtain Valpha and Vbeta; the SVPWM module is used for calculating a three-phase PWM duty ratio according to the Valpha and the Vbeta, and generating six paths of PWM waveforms; the time sequence control module is used for starting or closing a corresponding module according to a current control time sequence, and completing the control of the current of a permanent magnet synchronous motor. According to the device, the delay in a current control loop is greatly reduced through the optimization of a control time sequence and the design of an FPGA-based current controller, so that the bandwidth of the current loop is improved.

Methods and apparatus are disclosed for dynamic bandwidth expansion for wireless clients of a wireless wide-area network (WWAN), wherein each client has an allocated bandwidth for communicating over the WWAN and the clients are within wireless signal reception of each other. The WWAN clients may voluntarily or in a predetermined manner join a pool of bandwidth-sharing clients. A wireless aggregation server and a wireless pool boss work in cooperation to utilize unused transmit and receive bandwidth from each of the pool members.

The invention provides a service bandwidth expansion method in cloud computing network virtualization. The service bandwidth expansion method comprises the following steps: associating logic network cards, corresponding to a plurality of physical network cards of a physical server, in an operating system with a virtual network card; writing the name of the virtual network card into a management database of a virtual switch to enable the virtual network card to be a port for communicating the virtual switch with a physical switch; writing the name of a network card of at least one virtual machine into the management database of the virtual switch to enable the network card of at least one virtual machine to be a port for communicating the virtual switch with at least one virtual machine. According to the method, by writing the network card of the virtual machine and the virtual network card into the management database of the virtual switch, any one data stream of the virtual machine is split and is sent to the physical network cards, so that the network bandwidth can be elastically expanded by services of any protocol in the virtual machine according to the quantity of users and the change of bandwidth requirements of the users under the condition that the total bandwidth is unchanged.

The invention discloses a training method of a voice bandwidth expansion model and a voice bandwidth expansion method, wherein the voice bandwidth expansion method comprises the following steps: acquiring to-be-expanded narrowband voice; calculating an amplitude spectrum and a phase spectrum of the to-be-expanded narrowband voice, and extracting auxiliary characteristics of the to-be-expanded narrowband voice ; processing the amplitude spectrum and the auxiliary characteristics of the to-be-expanded narrowband voice by virtue of the voice bandwidth expansion model which is obtained from training, so that the amplitude spectrum of a reconstructed bandwidth voice high-frequency band can be obtained; conducting mirror image reversing on the phase spectrum of the to-be-expanded narrowband voice in a frequency domain, and determining the phase spectrum of the bandwidth voice high-frequency band; and on the basis of the amplitude spectrum and the phase spectrum of the narrowband voice, and in combination with the amplitude spectrum and the phase spectrum of the reconstructed bandwidth voice high-frequency band, determining a bandwidth voice signal. With the application of the voice bandwidth expansion method provided by the invention, an effect of improving the tone quality and naturalness of the narrowband voice can be achieved.

The invention discloses a multi-server system in load-balancing environment and a file transmission method thereof. The load-balancing network environment comprises load-balancing servers and a plurality of load machines, and a file server system is established in parallel on the basis. The invention can upload the file data of a large file to a static file storage server by FTP service, no longer relies on the load-balancing environment because of the adoption of an independent file server system, solves the problems of storage and load balance, can effectively solve the problem of file transmission in the load-balancing environment, enables the system to have better load-balancing performance, is beneficial to the bandwidth expansion of network equipment and the servers, increases the throughput, enhances the data-processing capability of a network and improves the flexibility and the usability of the network.

The invention belongs to the field of technologies related with ultra-precision active vibration isolation, and discloses an active vibration isolation controller and a design method thereof. The design method comprises the following steps: (1) designing a feedback controller based on an equivalent model after acoustic emission sensor is extended to determine a bandwidth extension frequency pointof a feedback control error sensor; (2) designing the feedforward controller, and determining a bandwidth extension frequency point of a feedforward reference sensor according to a noise constraint condition, noise performance constraint condition being that the rVPSD of a load caused by noise in a feedback strategy is smaller than or equal to 0.707 times of the rVPSD of the load without the feedback strategy, and the noise constraint condition being that the noise equivalence speed of the feedforward reference sensor noise is smaller than or equal to 0.707 times of the rVPSD of foundation vibration. As low-frequency extension of the sensor and an active vibration isolation controller are unified, the stability is improved, and the control loss caused by insufficient or excessive bandwidthextension of the sensor is avoided.

The invention relates to a metropolitan area network planning method. The method comprises the following steps of: collecting metropolitan area network output peak flow, BRAS (Broadband Remote Access Server) peak flow, IPTV (Internet Protocol Television) peak flow and SR peak flow through a network manager of the metropolitan area network, and calculating to obtain metropolitan area network exit proportion of each local area network; calculating the metropolitan area network output peak flow according to the metropolitan area network exit proportion; collecting public broadband user number, government and enterprise dial-in user number, public broadband peak user number and government and enterprise dial-in peak user number of the local area network through the network manager of the metropolitan area network, and calculating a broadband user on-line concentration ratio; calculating on-line average bandwidth used by public broadband and government and enterprise dial-in users; according to the past planning data, reckoning the average bandwidth used by public users in the few next years by using a flow curve extrapolation method. The method can accurately predict the future metropolitan area network flow, saves the network bandwidth of the metropolitan area network to the greatest extent, ensures the development of data service, greatly saves the metropolitan area network bandwidth expansion investment for operators, and has relatively good economic values and social values.

Bandwidth expansion for audio signals by frequency band translations plus adaptive gains to create higher frequencies; use of a common channel for both stereo channels limits computational complexity. Adaptive cut-off frequency determination by power spectrum curve analysis, and bass expansion by both fundamental frequency illusion and equalization.

A monolithic integrated laser chip based on amplification feedback to realize straight-strip bandwidth expansion comprises a lower limiting layer, an active layer, an upper limiting layer, a waveguide layer, a P+electrode layer and an N+electrode layer. The active layer is manufactured on the lower limiting layer, the upper limiting layer is manufactured on the active layer, the waveguide layer is strip-shaped and longitudinally manufactured in the middle of the front of the upper limiting layer, the P+electrode layer is divided into three sections by isolating grooves and manufactured on the waveguide layer, the N+electrode layer is manufactured on the back of the lower limiting layer, the three sections of the P+electrode layer are a DFB (distributed feedback Bragg) laser area, a passive phase adjusting area and an active amplification feedback area respectively, a distribution feedback Bragg grating layer is manufactured on a portion, corresponding to the upper limiting layer, of the DFB laser area, and gain peak between the active layer corresponding to the passive phase adjusting area and the active layer corresponding to the DFB laser area and the active amplification feedback area has 90nm of blue shift. The monolithic integrated laser chip can break through limitation of straight-strip bandwidth of a common laser chip, and laser straight-strip bandwidth expansion can be realized through a method which is ingenious, effective and low in cost.

The invention discloses an artificial speech bandwidth expansion method and device based on K-SVD. The method is characterized by including 1, training original wideband speech signals at the bandwidth expansion transmitting end, and acquiring a wideband speech dictionary, a narrowband speech dictionary and narrowband speech sparse matrix; 2, at the bandwidth expansion receiving end, performing bandwidth expansion on original narrowband speech signals through the wideband speech dictionary and the narrowband speech dictionary, and acquiring the expanded final wideband speech signals. By the aid of the method, the wideband speech quality is improved, the training time and prior knowledge usage are reduced greatly, the accuracy of the original narrowband speech sparse matrix is improved effectively, practicality is high, and the method can be applied to the field of speech communication widely.

The invention relates to a 1553B digital communication device. In order to expand the communication capacity, expand the data-transfer capacity and enhance the communication properties such as property in resisting interference and the like in a 1553B bus, the invention provides the technical scheme: a receiving method for bandwidth expansion of a 1553B communication bus. The following method sub-modules: an analog front end (AFE), a frame detecting module, a symbol synchronizing module, an inverse FFT (fast Fourier transformation) module, a block floating point module, a channel balancing module, a frequency offset synchronizing module, a QAM (quadrature amplitude modulation) de-mapping module of a dynamic threshold and a base-band processing module are provided in the receiving method, wherein the AFE is used for performing signal amplification and AD (analog-to-digital) conversion, sampling an analog signal into a digital signal and transmitting; the frame detecting module is used for detecting the access situation of a frame; the IFFT module is used for processing a base-band signal. The method provided by the invention is mainly used for 1553B digital communication.

The present invention provides a blank sub-band filling method, which comprises: receiving a code stream, and obtaining the encoding index for the first reinforcement layer and the encoding index for the second reinforcement layer; determining the decoding information according to the encoding index for the first reinforcement layer, and determining the decoding information according to the encoding index for the second reinforcement layer; filling and smoothing the unquantized sub-band according to the decoding information, filling preliminarily the high-frequency part of the second reinforcement layer that can't be decoded according to the decoding information of the first reinforcement layer, and smoothing the filled sub-band and adjacent sub-bands. A bandwidth expansion parameter encoding method is used for the first reinforcement layer to create the encoding index; for the second reinforcement layer, the low-frequency residual error signal and high-frequency signal are converted to the frequency domain and then quantized, and the vector quantization encoding index is used as the encoding index for the second reinforcement layer. The present invention can effectively reduce the adverse effect of frequency spectrum cavity phenomenon to the decoded signals, and thereby improve the acoustic quality of the decoded signals.

An actively compensated CML circuit includes a CML buffer circuit and a bandwidth expansion circuit. The CML buffer circuit includes a first MOS transistor and a second MOS transistor in a differential pair configuration. A first load resistor is coupled to a first MOS transistor drain at a first output terminal and a second load resistor is coupled to a second MOS transistor drain at a second output terminal. The bandwidth expansion circuit is coupled to the CML buffer circuit in a source follower configuration. The bandwidth expansion circuit includes a third MOS transistor and a fourth MOS transistor. A capacitor is coupled across a third MOS transistor source and a fourth MOS transistor source. The fourth MOS transistor and the third MOS transistor generate a high pass function at the first output terminal and the second output terminal.

The invention concerns a method (400) and system (100) for bandwidth extension of voice for improving the quality of voice in a communication system. The method can include the steps of receiving (412) an unknown voice signal (105), identifying (414) the voice bandwidth (625) of the received unknown voice signal and establishing (418) a region of support (636) in view of the spectral content of the received voice signal. The method can further include the step of selecting (428) a combination of mapping databases (210, 212, 214) from a plurality of mapping databases. Each mapping database can be associated with a predetermined bandwidth extension range for extending the voice bandwidth.

The present invention provides methods for noise reduction and bandwidth expansion in wireless communication and the devices thereof. The method in accordance with the present invention may include identifying a plurality of neighbor nodes with respect to a central node; sending a first communication signal to the plurality of neighbor nodes, wherein the first communication signal is only sent to the nodes that are considered as the plurality of neighbor nodes by the central nodes; and based on the first communication signal, when the central node is transmitting data to one of the plurality of neighbor nodes, the other nodes of the plurality of neighbor nodes do not send data in the same channel, thereby reducing the noise in the wireless network.

A method and apparatus are provided for controlling connection to a communication path in a communication network. The apparatus receives a bandwidth request and determines a value of bandwidth expansion factor from information relating to transmission of data over the communication path, which may include the type of channel, the type of connection, the sizes of packet payload and the distribution of the size of packet payload for transmission on the communication path. The actual bandwidth being requested is determined using the bandwidth expansion factor and this information is used by a connection admission controller to allow or deny the requested connection, and / or by a scheduler to control data transmission.

The invention discloses a method for reducing a peak-to-average power ratio of frequency domain forming OFDM (Orthogonal Frequency Division Multiplexing) without bandwidth expansion and mainly solves the problem that the peak-to-mean ratio performance of an OFDM signal showed in the prior art is too low. The method disclosed by the invention comprises the following steps of: (1) carrying out a serial-to-parallel conversion on input signals by a signal processor and obtaining signal sequences in parallel transmission; (2) multiplying a diagonal matrix and a square matrix, made up of different Chu sequences, to acquire a pre-coding matrix, and weighing the signal sequences by using the pre-coding matrix; (3) constructing a Gaussian-like function as a frequency domain forming function, and weighing the signals; (4) after carrying out a zero insertion operation and a rapid inverse Fourier transform on each data symbol, performing a parallel-to-serial conversion on the signal sequences andacquiring OFDM transmission signals suitable for transmission. The method for reducing the peak-to-average power ratio of frequency domain forming OFDM (Orthogonal Frequency Division Multiplexing) without bandwidth expansion, disclosed by the invention, has the advantages of low complexity and high utilization rate of frequency spectrum; and the peak-to-average ratio of the signals can be reducedremarkably without losing bit error rate of received signals, and the power utilization rate of a transmitter of a communication system is improved.

A system and method for providing ancillary data over compressed multimedia packets. Ancillary data may be added to encoded or compressed packets without increasing the bandwidth required to transmit the packets over a transmission medium. After transmission, the ancillary data can be recovered and the packets restored to their original form without any loss of data or damage to original content. The ancillary data can be presented to a user on-demand, or in response to an event. The content of the ancillary data can also be correlated to the type of event that initiated the delivery or to the content of the encoded or compressed packets.

The invention relates to a multi-channel digital audio coding method based on a DRA coder, which is characterized by comprising the following steps of: firstly downmixing a plurality of channels into less channels by using a parameter multi-channel coding method; processing a low frequency part of the channels subjected to the downmixing by using the DRA coder; and carrying out bandwidth expansion processing on a high frequency part of the channels subjected to the downmixing.