7 results about "Prototype filter" patented technology

This invention discloses an optimal pairwise pilot design method for a filter bank multicarrier communication system. First, based on the pairwise pilot channel estimation method, a pilot optimization model is established, and expressions for inherent interference and prototype filters are given in the model. Then, using differentiation analysis, the optimal pilot values ​​are determined under constraint boundary conditions, thus transforming the constraints of the pilot optimization model into equality constraints. Finally, optimal pairwise pilot structures applicable to different prototype filters are provided, and these structures are used as pilot designs for the pairwise pilot channel estimation method. Using this method, only two columns of pilot symbols are needed for channel estimation, and different pilot structures are adopted according to the type of prototype filter, thereby reducing pilot load while adapting to different communication scenarios.

A decoding method and an encoding method applying filter coefficient update are provided. The decoding method includes: determining a plurality of reference samples for a prediction mode; determining a prototype filter; acquiring an updated filter based on the prototype filter by trimming and / or truncating one or more coefficients of the prototype filter; and filtering the plurality of reference samples with the updated filter to generate predicted samples of a current block.

A method of processing audio is provided. The method includes determining modulated filter bank, MFB, domain broad band gains for fading an audio signal in accordance with a time domain target gain, so that application of the broad band gains in the MFB domain emulates application of the target gain in the time domain. Determining the broad band gains includes computing the broad band gains using the target gain, an MFB analysis prototype filter, and an MFB synthesis prototype filter. Also provided are corresponding apparatus, programs, and computer-readable storage media.

The present invention relates to a cascaded filter and a fundamental wave extraction method thereof, belonging to the technical field of digital signal processing. The method includes: determining an initial value of an interpolation factor M; substituting the interpolation factor into the cascaded filter to obtain a filtering result corresponding to the initial value; the cascaded filter includes a shaping filter and a masking filter, the shaping filter is an FIR filter, and the shaping filter is obtained by interpolating M - 1 zeros between adjacent impulse response coefficients of a prototype filter; the masking filter is a recursive filter; adjusting the magnitude of the interpolation factor, comparing the filtering results corresponding to different interpolation factors, and taking the value of the interpolation factor with the best filtering result as the final value of the interpolation factor; the cascaded filter performs fundamental wave extraction according to the final value of the interpolation factor. In the present invention, the increase of the M value does not affect the computational amount of the recursive filter, and thus does not affect the computational amount of the overall cascaded filter. Therefore, when the M value is relatively large, the extraction efficiency of the fundamental wave is improved.

The present invention provides a dynamic digital channelization receiving method, including: establishing a mathematical model of a WOLA analysis filter bank; establishing a mathematical model of a WOLA synthesis filter bank; determining the passband cut-off frequency and the stopband start frequency of a prototype filter according to a channel division method; designing the prototype filter using the FRM technique; performing spectrum detection on the output signal of the analysis filter bank using energy detection, and inputting the detected cross-channel signal into the synthesis filter bank for reconstruction; The present invention considers the entire implementation process of dynamic channelization. By improving the FRM technique, a novel FRM is proposed for designing filters with power complementary characteristics, which are then used as the prototype filters of the dynamic channelization structure of the WOLA filter bank, reducing the computational complexity of directly designing such filters and overlapping channels to reduce signal distortion caused by blind spots.

The invention discloses a sound field control method, a measurement device, electronic equipment and a readable storage medium, and relates to the technical field of spatial audio, and the method comprises the steps: obtaining the propagation time delay from a plurality of sound sources to at least one target listening point in a target listening area; performing pulse response modeling based on each propagation time delay to obtain a prototype filter model; performing optimization solution on the prototype filter model according to a preset target response function to obtain a target filter coefficient; wherein the objective of the optimization solution is to minimize an error between a system response function of the prototype filter model after the prototype filter model is processed by a target filter coefficient and a target response function; the target filter coefficient is used for filtering the audio input signal so as to reconstruct or form a sound field in the target listening area. According to the invention, the robustness of sound field control is improved.

A method of processing an audio signal is disclosed. According to embodiments of the method, magnitude response information of a prototype filter is determined. The magnitude response information includes a plurality of gain values, at least one of which includes a first gain corresponding to a first frequency. The magnitude response information of the prototype filter is stored. The magnitude response information of the prototype filter at the first frequency is retrieved. Gains are computed for a plurality of control frequencies based on the retrieved magnitude response information of the prototype filter at the first frequency, and the computed gains are applied to the audio signal.