# By convolution

## Subclass of:

## 708 - Electrical computers: arithmetic processing and calculating

## 708100000 - ELECTRICAL DIGITAL CALCULATING COMPUTER

## 708200000 - Particular function performed

## 708300000 - Filtering

### Patent class list (only not empty are listed)

#### Deeper subclasses:

Class / Patent application number | Description | Number of patent applications / Date published |
---|---|---|

708315000 | By convolution | 7 |

20080250092 | SYSTEM FOR CONVOLUTION CALCULATION WITH MULTIPLE COMPUTER PROCESSORS - A system for calculating a convolution of a data function with a filter function utilizing an array of processors including first and last processors. A coefficient value based on a derivation of the filter function and a data value representative of the data function are multiplied to produce a current intermediate value. Except in the first processor, a prior intermediate value is then added to the current intermediate value. Except in the last processor, the data and current intermediate values are then sent to the next processor. Then the last processor's prior intermediate value, if any, is added to its current intermediate value to produce a result value, wherein the result values collectively are representative of the convolution of the data function with the filter function. | 10-09-2008 |

20090070396 | WAVEFORM EQUALIZING DEVICE - Tap coefficients for a filter for removing a ghost signal are converged to optimum values in a short time. The waveform equalizing device includes: an initial tap coefficient generation section for determining and outputting the initial values of tap coefficients for a FIR filter and an IIR filter based on a plurality of correlation values; and a tap coefficient updating section for outputting the initial values of tap coefficients for the FIR filter and the IIR filter to these filters and updating tap coefficients for these filters based on error information. The initial tap coefficient generation section reverses the order of values, among the plurality of correlation values, corresponding to delays within a predetermined range to determine the order-reversed values as the initial values of tap coefficients for the FIR filter corresponding to the delays within the predetermined range, and also reverses the signs of values, among the plurality of correlation values, corresponding to delays exceeding the predetermined range to determine the sign-reversed values as the initial values of tap coefficients for the IIR filter. | 03-12-2009 |

20120131079 | METHOD AND DEVICE FOR COMPUTING MATRICES FOR DISCRETE FOURIER TRANSFORM (DFT) COEFFICIENTS - A method of computing matrices of discrete-frequency Discrete Fourier Transform (DFT) coefficients, the method including the steps of (a) for a first frame ( | 05-24-2012 |

20120246211 | SYNTACTICAL SYSTEM AND METHOD FOR CHROMATOGRAPHIC PEAK IDENTIFICATION - A system and method identifies data peaks representative of empirical data of a sample. The system and method assign a grammar type to correspond to data points represented on a data plot such as a chromatogram and identify the presence of a peak syntax based on an analysis of the grammar element types assigned to the data points of the chromatogram. | 09-27-2012 |

20130031152 | METHODS AND APPARATUSES FOR CONVOLUTIVE BLIND SOURCE SEPARATION - Methods and apparatuses for convolutive blind source separation are described. Each of a plurality of input signals is transformed into frequency domain. Values of coefficients of unmixing filter corresponding to frequency bins are calculated by performing a gradient descent process on a cost function at least dependent on the coefficients of the unmixing filters. In each iteration of the gradient descent process, gradient terms for calculating the values of the same coefficient of the unmixing filters are adjusted to improve smoothness of gradient terms across the frequency bins. With respect to each of the frequency bins, source signals are estimated by filtering the transformed input signals through the respective unmixing filter configured with the calculated values of the coefficients. The estimated source signals on the respective frequency bins are transformed into time domain. The cost function is adapted to evaluate decorrelation between the estimated source signals. | 01-31-2013 |

20130117342 | COMBINED RF EQUALIZER AND I/Q IMBALANCE CORRECTION - Software implementations are provided for performing IQ imbalance correction and/or RF equalization. An input signal, x, is processed in software by executing a vector convolution instruction to apply the input signal, x, to a first complex FIR filter that performs one or more of RF equalization and IQ imbalance correction; and executing a vector convolution instruction to apply a conjugate x* of the input signal, x, to a second complex FIR filter that performs the one or more of RF equalization and IQ imbalance correction, wherein the second complex FIR filter is in parallel with the first complex FIR filter. The first and second complex FIR filters have complex coefficients and the input signal comprises a complex signal. | 05-09-2013 |

20190149134 | FILTER OPTIMIZATION TO IMPROVE COMPUTATIONAL EFFICIENCY OF CONVOLUTION OPERATIONS | 05-16-2019 |