Class / Patent application number | Description | Number of patent applications / Date published |
708311000 | Frequency detection | 6 |
20090063602 | DEVICE AND METHOD FOR PREVENTING WIRETAPPING ON POWER LINE - Provided are a device and method for detecting a wiretapping device using a power line and nullifying the wiretapping device. More particularly, a device and method for preventing wiretapping, which sense a wiretapping signal from a power line and transmit a noise signal to the power line, are provided. The device for preventing wiretapping includes: a signal detector for receiving signals from a power line and filtering the received signals in at least one frequency band; a controller for receiving the filtered signal from the signal detector and determining whether a wiretapping signal exists; and a noise signal output unit for transmitting a noise signal to the power line according to whether or not the wiretapping signal exists. The device can detect wiretapping and simultaneously nullify the function of the wiretapping device by detecting a wiretapping signal from a power line and transmitting a noise signal having a frequency corresponding to a frequency band of the wiretapping signal. | 03-05-2009 |
20100070550 | METHOD AND APPARATUS OF A SENSOR AMPLIFIER CONFIGURED FOR USE IN MEDICAL APPLICATIONS - A digital data bandpass filter process using digital signal processing processes raw digital data twice using distinct all-pass filters, wherein the two filters perform different frequency-dependent phase shifts of the digital content. The two filter output streams may be subtracted to remove out-of-band energy. The process produces lower levels of noise and conversion artifacts when used for filtering fixed-point data that may have low energy, and thus few non-zero bits, in the analog input signals, than conventional digital bandpass filters. | 03-18-2010 |
20110289129 | METHOD FOR DETERMINING SAMPLING RATE AND DEVICE THEREFOR - A method and a device for determining sampling rate are provided. The device receives an input signal of SPDIF. The method includes following steps. A plurality of multiple values between a plurality of bi-phase clock frequencies of the input signal and a system frequency are obtained, and a first weighted average and a second weighted average are calculated according to a first filter range, a second filter range and the multiple values. When a first difference is greater than a second difference, the sampling rate is set to a first sampling rate. Otherwise, the sampling rate is set to a second sampling rate. The first difference and the second difference are obtained according to the first weighted average, the second weighted average and a frequency threshold. The method determines the sampling rate rapidly according to weighted averages adjusted by filter ranges, reduces a probability of erroneous judgment and saves memory. | 11-24-2011 |
20110314074 | LOW POWER AND LOW COMPLEXITY ADAPTIVE SELF-LINEARIZATION - A digital signal processing system comprising: an input terminal to receive an input signal that includes a distorted component and an undistorted component, the input signal having a sampling rate of R; and an adaptive self-linearization module coupled to the input terminal, to perform self-linearization based at least in part on the input signal to obtain an output signal that is substantially undistorted, wherein: the adaptive self-linearization module is to generate a replica distortion signal that is substantially similar to the distorted component, the generation being based at least in part on a target component having a sampling rate of R/L, L being an integer greater than 1; the adaptive self-linearization module includes a first digital signal processor (DSP) that is adapted to obtain a filter transfer function that approximates a system distortion transfer function, and a second DSP that is configured using configuration parameters of the first DSP. | 12-22-2011 |
20140040340 | WHITENING FILTER CONFIGURATION METHOD, PROGRAM, AND SYSTEM - A system is configured so that signals passed through an all-pass filter using warp parameter λ are whitening-filtered, and so that the frequency axis is restored by an all-pass filter using warp parameter λ. This optimizes the whitening filter by determining the optimum λ. First, the AR order p is automatically estimated using λ=0. A spectral distance dλ is computed using a discrete Fourier transform spectrum value passed through an all-pass filter using warp parameter λ and a discrete AR spectrum value passed through an all-pass filter using warp parameter λ. The λ which minimizes the spectral distance dλ is set as the warp parameter, and a whitening filter is configured in which the warp parameter has been optimized. | 02-06-2014 |
708312000 | Tone detection | 1 |
20130268571 | METHODS AND APPARATUS FOR EFFICIENT TONE DETECTION - An apparatus for determining the presence of a tone in an input signal includes memory circuitry and data processing circuitry coupled to the memory circuitry. The data processing circuitry is operative to receive multiple samples of the input signal, and to determine a first value at least in part by multiplying each of the samples by respective ones of a first set of values for an impulse response and summing the results. The data processing system is also operative to determine a second value at least in part by multiplying each of a portion of the samples by respective ones of a second set of values for the impulse response and summing the results. The data processing system is operative to determine the power of the tone in the multiple samples of the input signal at least in part by utilizing the first value and the second value. | 10-10-2013 |