A method of data compression performed by at least one core communicating with a central memory. The input data presents a two-dimensional input array formed by a plurality data items stored contiguously in the central memory according to a contiguous direction. The method comprises a step of wavelet transform comprising the following sub-steps: forming from the input array at least one tile comprising a plurality of consecutive data block columns, each data block column being formed by a plurality of lines of consecutive data items according to the contiguous direction, the length of each line being a multiple of the cache line length; and for each data block column computing dot products between a filter vector and each group of N lines using fused multiply-add instructions for the core.

The present disclosure relates to a compression/encoding apparatus and method, a decoding apparatus and method, and a program that allow for provision of a lossless compression technology with higher compression ratio. A GOB data configuration section configures GOB data with a group of digital data that includes a plurality of blocks by treating a frame of delta-sigma-modulated digital data as a block. A table generation section generates a conversion table for encoding the GOB data. An encoding section compresses and encodes the digital data of each block included in the GOB data by using the conversion table. The present technology is applicable, for example, to audio signal compression and encoding, and so on.

A first value of a first data element in a first set of data elements is obtained, the first set of data elements being based on a first time sample of a signal. A second value of a second data element in a second set of data elements is obtained, the second set of data elements being based on a second, later time sample of the signal. A measure of similarity is derived between the first value and the second value. Based on the derived measure, a quantisation parameter useable in performing quantisation on data based on the first time sample of the signal is determined. Output data is generated using the quantisation parameter.

The described technology is generally directed towards selecting a compression and/or quantization function for communicating data to and from an analog front end of a radio unit of a base station coupled to a digital baseband processor of a central unit of the base station. The compression function and/or quantization function can be adaptively and/or otherwise selected based on various criteria, such as the amount of data being transmitted, whether the data corresponds to reference signals or other data, the network architecture (e.g., digital beamforming or hybrid beamforming) in use, and so on.

The present application discloses a forward and backward smooth decoding method and device suitable for an OvXDM system, and a system. Importance weights of particles in a particle set corresponding to a symbol are calculated by using a forward process and a backward process, and screening is performed with reference to forward importance weights of particles and backward importance weights of particles, to output a final decoding sequence.

A first value of a first data element in a first set of data elements is obtained, the first set of data elements being based on a first time sample of a signal. A second value of a second data element in a second set of data elements is obtained, the second set of data elements being based on a second, later time sample of the signal. A measure of similarity is derived between the first value and the second value. Based on the derived measure, a quantisation parameter useable in performing quantisation on data based on the first time sample of the signal is determined. Output data is generated using the quantisation parameter.

The present technology relates to a signal processing apparatus, a signal processing method, and a program that make it possible to cope with an output of a PCM signal using one DSD signal. A distribution apparatus includes an extraction section that, in a case where a PCM signal having a predetermined sampling frequency is generated from a DSD signal, extracts a predetermined number of samples from the DSD signal around samples at a predetermined interval determined by the predetermined sampling frequency, and a filtering section that generates the PCM signal having the predetermined sampling frequency by filtering the extracted predetermined number of samples. The present technology is applicable to, for example, a distribution apparatus, etc., that distributes the PCM signal to a client apparatus.

Quantisation methods are provided which employ dither techniques to reduce the noise penalty in certain circumstances whilst still removing noise modulation. One method relates to reducing the wordwidth of audio by one bit, while another method relates to burying one bit of data in a pair of signal samples.

Disclosed is a digital stereo multiplexing-demultiplexing system based on the use of delta-sigma modulation. Creation of left (LR) and right (L+R) channels is achieved using a binary delta adder IC circuit. Delta adder is an ordinary binary adder with an interchanged role of the Sum and Carry-Out terminals. Two channel multiplexer and demultiplexer are implemented with ordinary binary logic gates. Output of the multiplexer is modulated and transmitted to the receiver where demultiplexing is performed. The proposed method can combine two or more digital stereo channels. This method is not application limited, and can be used in acoustic, video, or photo applications.

A digital microphone device includes circuitry that can reduce the risk of noise caused due to an idle tone frequency component in a digital signal output by the digital microphone device. In stereo mode and other applications where interference occurs between two or more such microphones, each microphone device includes a digital output having a corresponding idle tone frequency, one of which is offset to shift noise components outside of a desired frequency range.