122 results about "Bandwidth compression" patented technology

Transfer functions like Head Related Transfer Functions (HRTF) needed for binaural rendering are implemented efficiently by a subband-domain filter structure. In one implementation, amplitude, fractional-sample delay and phase-correction filters are arranged in cascade with one another and applied to subband signals that represent spectral content of an audio signal in frequency subbands. Other filter structures are also disclosed. These filter structures may be used advantageously in a variety of signal processing applications. A few examples of audio applications include signal bandwidth compression, loudness equalization, room acoustics correction and assisted listening for individuals with hearing impairments.

An amplitude modulated optical communication system and method are disclosed that achieve bandwidth compression by making use of an n level amplitude modulation scheme in one or more frequency bands. A soft decision decoder is disclosed that provides at least two soft slicing levels between each signal level in the multiple level transmission scheme to define an “uncertainty” region therebetween. The soft slicing levels are used to evaluate the reliability of a given bit assignment. In addition to assigning a digital value based on the received signal level, one or more soft bits are assigned indicating a “reliability” measure of the output code.

When a terminal is moved to an area covered by a different switching node RNC of a radio access network, degradation of speech quality is prevented by returning a transcoder insertion connection to a transcoder-free-operation connection. When the terminal is moved and the switching node RNC of the radio access network is changed, a relocation is performed by inserting the transcoder, re-confirmation of parameter information of a bandwidth-compression coding system is requested for a local side switching node RNC and a remote side switching node RNC and, when the transcoder can be bypassed according to the confirmation, the transcoder is removed to return to the transcoder-free-operation connection mode.

Techniques and systems are provided for compressing data in a neural network. For example, output data can be obtained from a node of the neural network. Re-arranged output data having a re-arranged scanning pattern can be generated. The re-arranged output data can be generated by re-arranging the output data into the re-arranged scanning pattern. One or more residual values can be determined for the re-arranged output data by applying a prediction mode to the re-arranged output data. The one or more residual values can then be compressed using a coding mode.

Memory controllers employing memory capacity and/or bandwidth compression with next read address prefetching, and related processor-based systems and methods are disclosed. In certain aspects, memory controllers are employed that can provide memory capacity compression. In certain aspects disclosed herein, a next read address prefetching scheme can be used by a memory controller to speculatively prefetch data from system memory at another address beyond the currently accessed address. Thus, when memory data is addressed in the compressed memory, if the next read address is stored in metadata associated with the memory block at the accessed address, the memory data at the next read address can be prefetched by the memory controller to be available in case a subsequent read operation issued by a central processing unit (CPU) has been prefetched by the memory controller.

Various communication systems may benefit from improved bandwidth compression techniques. For example, certain communication systems may benefit from a radio fronthaul traffic compression on a frequency domain data. A method can include identifying a composite waveform corresponding to a real component and an imaginary component of a frequency domain data at a first device. The method may also include causing a transmission of a value that represents the composite waveform to a second device from the first device.

The invention discloses a bandwidth compressed high-spectral-efficiency multi-carrier communication method, belonging to the field of multi-carrier communication technology. The method comprises the following steps: serially connecting external coding and multi-carrier modulation processing at a transmitter through pseudo-random interleaving, and equalizing to a mode of encoding signals through aserially concatenated Turbo code; performing decoding and interference cancellation at a receiver by using an iterative decoding structure of a serial Turbo code, serially connecting internal decodingprocessing and external decoding processing through pseudo-random interleaving and de-interleaving, and continuously exchanging soft information with each other to achieve iteration, wherein the internal decoding mode performs iterative estimation and cancellation for ICI by using a successive interference cancellation method, the external decoding mode decodes external codes by using a soft input and soft output method, and thus the impact of Gaussian white noises of channels can be resisted. Compared with existing methods, by adopting the method disclosed by the invention, a better detection performance can be obtained by using a lower computation complexity, and meanwhile, a large multi-carrier communication system with more sub-carriers can be adapted.

Providing memory bandwidth compression using adaptive compression in central processing unit (CPU)-based systems is disclosed. In one aspect, a compressed memory controller (CMC) is configured to implement two compression mechanisms: a first compression mechanism for compressing small amounts of data (e.g., a single memory line), and a second compression mechanism for compressing large amounts of data (e.g., multiple associated memory lines). When performing a memory write operation using write data that includes multiple associated memory lines, the CMC compresses each of the memory lines separately using the first compression mechanism, and also compresses the memory lines together using the second compression mechanism. If the result of the second compression is smaller than the result of the first compression, the CMC stores the second compression result in the system memory. Otherwise, the first compression result is stored.

Embodiments of the present invention set forth systems and methods for compressing thread group data written to frame buffer memory to increase overall memory performance. A compression/decompression engine within the frame buffer memory interface includes logic configured to identify situations where the threads of a thread group are writing similar scalar values to memory. Upon recognizing such a situation, the engine is configured to compress the scalar data into a form that allows all of the scalar data to be written to or read from the frame buffer memory in fewer clock cycles than would be required to transmit the data in uncompressed form to or from memory. Consequently, the disclosed systems and methods are able to effectively increase memory performance when executing thread group STORE and LOAD operations.

In the invention, the codec is divided into two parts-encoder and decoder. The encoder comprises: a vector buffer of the inputted message source, an encode index generator; a channel signal outputting unit; a channel signal power and parameter memory; a re-built message source memory; and an encoding channel signal memory. The decoder comprises: a vector buffer of the inputted channel, a decode index generator, a re-built message source outputting unit; a decode channel signal memory and a re-built message source memory. The codec provided can the channel-optimized k-dimension channel signals from L-dimension message source after direct coding so as to implement the bandwidth compression and expansion of message source.

The invention provides a high spectrum efficiency security access method based on dual non-orthogonal characteristics, which supports secure accesses of more users under the same quantity of carriers,and belongs to the technical field of information and communication. The method is applied to an uplink, and comprises the steps as follows: S1, the J users share N non-orthogonal sub-carriers, and Jis more than N; input signals of the J users are separately subjected to non-orthogonally secure mapping according to a security matrix, and thus multiple accesses are achieved; S2, the J signals after non-orthogonally secure mapping are separately subjected to non-orthogonal multiplexing, and a bandwidth compression factor can be changed in the non-orthogonal multiplexing; S3, the J signals after non-orthogonally secure mapping are overlapped into one signal to be transmitted in a channel; S4, a receiver performs non-orthogonal demultiplexing on the received signal; and S5, the non-orthogonally demultiplexed signal is subjected to non-orthogonally secure demapping according to the security matrix, and thus the estimated values of the input signals of the J users are acquired. According to the method provided by the invention, the performance of secure wireless communication and the bandwidth utilization ratio also can be improved, and meanwhile, the same transmission speed of the every carrier is kept.

The invention provides a bandwidth resource processing method and device. The bandwidth resource processing method comprises steps of choosing a suitable LTE standard system bandwidth to match, adopting a PCI screening module and a physical scheduling regulation module to guarantee that an uplink channel and a downlink channel have smallest mapping in a frequency band or fall into the outside of a non-standard bandwidth with a zero limit according to scheduling and resource mapping characteristics of an LTE uplink channel and an LTE downlink channel and a service channel, using an emission power enhancement module to enhance the physical channel power in order to improve channel transmission and obtaining a time domain signal matched with a non-standard bandwidth to emit through an RRU filter. The bandwidth resource processing method and device solve a problem that a limited network spectrum cannot be effectively utilized when a wireless network spectrum is an LTE non-standard bandwidth, realize bandwidth compression emission of the LTE system under a non-standard bandwidth resource and highly effectively use wireless network resource.

A method and computing system for receiving an indication of a first user participating in a videoconference. A determination is made concerning whether bandwidth compression is preferable for the first user of the videoconference. If bandwidth compression is preferable for the first user of the videoconference: an unprocessed video stream associated with the first user is processed to generate a reduced bandwidth video stream, and the reduced bandwidth video stream is provided to a video encoder. Processing the unprocessed video stream includes performing an edge detection procedure on the unprocessed video stream.

The invention discloses a quick signal processing method of an OOFDM (optical orthogonal frequency division multiplexing) transceiver. The quick signal processing method comprises the following steps of: sending and receiving signals; and when the signals are sent, performing serial/parallel conversion of the signals, automatic detection pseudo code addition of channels, bandwidth compression encoding, orthogonal multi-subcarrier generation, inverse Fourier transform, signal crest value interception and quantification, cyclic prefix addition and parallel/serial conversion. Transmitted OFDM signals subjected to photoelectric conversion generates digital electric OFDM signals through an analog-to-digital converter (ADC) at a corresponding receiving end, and a signal processing course opposite to that at an emitting end is performed on the synchronized electric OFDM signals to obtain transmission signals. During the signal processing course, the quick signal processing method disclosed by the invention utilizes the characteristics of a hermite symmetric structure to reduce the realization difficulty of the receiving end and the cost, and the quick signal processing method has a relatively strong self-adaptation capability.

The invention provides a call admission control method based on multistage degradation, comprising the following steps: (1) controlling the call admission service by combining adaptive bandwidth and multi-queue strategy; performing step (2) when the residual bandwidth is less than the minimum bandwidth of the current call admission service; and (2) reducing the bandwidth occupied by audio-video broadcast or/and multicast services for the current call admission service to use. In the step (2), the broadcast or multicast services have degradation states in multiple stages; the degradation statein each stage corresponds to a certain proportion of bandwidth reduction; the audio-video broadcast or/and multicast services are degraded to different stages of degradation states gradually; and thebandwidth occupied by the audio-video broadcast or/and multicast services is gradually reduced until the residual bandwidth meets the requirement of the current call admission service. By degrading the audio-video broadcast and multicast services, the method realizes the requirement of admitting more services to the greatest extent under the condition of changeless total bandwidth.

The invention relates to the technical field of a computer network and particularly discloses an all optical network business restoration method based on bandwidth compression, which comprises the following steps of: S1, reducing a bandwidth required for restoring a failure business from two aspects: 1) first compressing a protection bandwidth between channels through a specific restoration route strategy to obtain a restoration route; 2) utilizing the controllable modulation order characteristics of an all optical network to compress the bandwidth required by the failure business self if network resources for the normal restoration of the failure business are insufficient on the restoration route; S2, allocating required frequency spectrum resources for the failure business in the restoration route so as to restore the transmission of the failure business. The invention has the advantages that with the restoration route strategy, the protection bandwidth between the channels can be compressed, the utilization rate of the resources and the protection restoration success rate are improved, and the network survivability is enhanced; with the mode for improving the modulation order, the bandwidth required by the business self can be compressed as far as possible under the condition of ensuring certain signal quality, and the business restoration success rate can be effectively increased.

A system and method for improving radio communication of frequency or phase modulated transmission and reception. Signal transmission is implemented by suppression of the upper and lower sidebands of a narrowband or very narrowband FM/PM signal from the transmission medium such that transmission is limited to the instantaneous frequency varied about the carrier frequency (center frequency). Suppression may be achieved by adding a bandpass filter between the modulator and the power amplifier of the narrowband FM transmitter. Upon receipt of the suppressed sideband signal, the received signal is converted to a first narrowband IF signal, and then the narrowband or very narrowband frequency deviation IF signal is expanded by frequency multiplication to generate a second wideband or very wideband IF signal. A discriminator may be used to convert the frequency-multiplied signal into a low frequency signal or audio signal for further processing. Through sideband suppression, bandwidth requirements are reduced without affecting sound quality and signal-to-noise ratio is improved.