Patent application number | Description | Published |
20090041263 | Echo Suppressing Method and Apparatus - Coefficient generator generates a crosstalk coefficient that is a predetermined value and that is used to calculate the amount of crosstalk of an echo. Converter uses either the output signal of a sound pickup device or the signal obtained by subtracting the output signal of an echo canceller from the output signal of the sound pickup device as a first signal, corrects the first signal based on the crosstalk coefficient generated in coefficient generator, and produces a near-end signal obtained by removing the echo from the first signal. | 02-12-2009 |
20090122931 | Adaptive Digital Filter, Signal Processing Method, FM Receiver, and Program - An adaptive digital filter is provided with a filter unit for generating and supplying an output signal by means of a convolution operation of an input signal and a filter coefficient, or a filter unit for taking as input signal a complex signal in which one of two signals that are generated from one real signal and that have phases that differ by 90° is a real part and the other signal is an imaginary part for generating and supplying an output signal that is a complex signal by means of a convolution operation of the input signal and a filter coefficient that is the real signal; and the update amount of the filter coefficient is controlled based on the estimated value of the amplitude of at least one of the input signal and output signal of the adaptive digital filter. | 05-14-2009 |
20090122932 | Adaptive digital filter, signal processing method, fm receiver, and program - A complex signal in which one of two signals that are generated from one real signal and that have phases shifted from each other by 90° is a real part and the other signal is an imaginary part is applied as input to an input terminal. A filter unit generates an output signal that is a complex signal by means of a convolution operation of this input signal and filter coefficients that are real signals and supplies the result to an output terminal. A coefficient control unit composed of a common unit and separate units controls the envelope target value based on the input signal and updates the filter coefficients such that the value of the envelope derived from the output signal approaches the envelope target value. | 05-14-2009 |
20090154717 | Echo Suppressing Method and Apparatus | 06-18-2009 |
20090207955 | Adaptive Digital Filter, FM Receiver, Signal Processing Method, and Program - The adaptive digital filter of the present invention includes: a filter unit that includes a plurality of multipliers ( | 08-20-2009 |
20090285335 | Adaptive Digital Filter, FM Receiver, Signal Processing Method, and Program - A complex signal in which one of two signals that have been generated from a single real signal and that have phases that are shifted 90° with respect to each other is a real part and the other signal is an imaginary part is applied as input to an input terminal. A filter unit generates an output signal that is a complex signal by means of a convolution operation of the input signal, and a filter coefficient that is a real signal and supplies this output signal to an output terminal. A coefficient control unit made up from a common unit and separate units updates the filter coefficients such that the value of the envelope of the output signal approaches a target signal. | 11-19-2009 |
20100208908 | ECHO SUPRESSING METHOD AND APPARATUS - The coefficient generating section receives a first signal which is the output signal of the microphone of a signal generated by subtracting the output signal of a linear echo canceller from the output signal of the microphone and a second signal which is the output signal of the linear echo canceller. The coefficient generating section detects the minimum value of the variation with time of the ratio of the amplitude of the first signal to that of the second signal and outputs the value of constant times the detected minimum value as a crosstalk coefficient indicating the degree of crosstalk of the echo. The converting section corrects the first signal according to the crosstalk coefficient and the second signal to generate a near-end signal which is the resultant signal of when the echo is removed from the first signal and outputs the near-end signal to an output terminal. | 08-19-2010 |
20100260352 | SYSTEM IDENTIFICATION DEVICE AND SYSTEM IDENTIFICATION METHOD - A system identifying device for identifying an unknown system interposed between first and second input terminals. The system identifying device preferably comprises adaptive and dependent filters which receive a signal supplied through a first input terminal, a dependent filter factor updating unit for updating the filter factor of the dependent filter according to the filter factor of the adaptive filter, a first subtracter for subtracting the output signal outputted from the adaptive filter from the signal supplied through a second input terminal, a first output error mean computing section for computing a first output error mean from the output signal outputted from the first subracter, a second subracter for subtracting the output signal outputted from the dependent filter from the signal supplied through the second input terminal, a second output error mean computing section for computing a second output error mean from the output signal outputted from the second subtracter, and a comparator for comparing the first and second output error means. The first output error mean computing section computes the first output error mean from the components which are the remainder of reduction of the components of at least part of the frequency band superposed on the frequency band of the observed noise applied to the second input terminal out of the frequence band of the output signal outputted from the first subracter. The second output error mean computing section computes the second output error mean from the components which are the remainder of reduction of the components of at least part of the frequency band superposed on the frequency band of the observed noise applied to the second input terminal out of the frequency band of the output signal outputted from the second subtracter. At least either update of the filter factor of the adaptive filter by the output signal outputted from the first subracter or of the filter factor of the dependent filter by the dependent filter factor updating unit is controlled depending on the result of the comparison by the comparator. | 10-14-2010 |
20100283536 | SYSTEM, APPARATUS, METHOD AND PROGRAM FOR SIGNAL ANALYSIS CONTROL, SIGNAL ANALYSIS AND SIGNAL CONTROL - A signal analysis control system is provided with a signal analyzing section for analyzing signals inputted to a transmission section and generating analysis information, and a signal control section for controlling signals inputted to a receiving section by using the analysis information. | 11-11-2010 |
20110002225 | SIGNAL ANALYSIS/CONTROL SYSTEM AND METHOD, SIGNAL CONTROL APPARATUS AND METHOD, AND PROGRAM - A signal analysis/control system includes: a signal analysis unit which analyzes an input signal of a transmission unit and generates analysis information; and a signal control unit which controls the input signal of a reception unit by using the analysis information. Thus, the signal analysis is performed in the transmission unit. This reduces the calculation amount concerning the signal analysis in the reception unit. Furthermore, the reception unit can control each of the constituent elements of the input signal according to the signal analysis information obtained in the transmission unit. | 01-06-2011 |