Abstract: A position detection system, including a memory storing instructions, and at least one processor configured to process the instructions to receive measured waveform signals sent out from an object to be measured via a first sensor and a second sensor, receive the broadcasting radio wave signals sent out from the first sensor and the second sensor, separate the measured waveform signals and the broadcasting radio wave, for each sensor, estimate an offset between the sampling frequencies of the measured waveform signal of the first sensor and the measured waveform signal of the second sensor based on the broadcasting radio wave signals respectively sent out from the first sensor and the second sensor, correct the measured waveform signal sent out from the second sensor based on the estimated offset between the sampling frequencies, and detect a position of the object to be measured based on the measured waveform signal sent out from the first sensor and a signal obtained by correcting the measured waveform sign

Abstract: An measurement terminals include: a sensor that measures pipe vibration in the pipe; a measurement information acquisition unit that acquires measurement position information and measurement time information; a transmitter that transmits the pipe vibration, the measurement position information and the measurement time information to an analyzer; a receiver that receives an analysis result from the analyzer; and an output unit that outputs the analysis result from the analyzer.

Abstract: The present invention is a leakage determination method comprising: comparing a correlation profile including a cross-correlation function obtained from measurement data measured at at least a pair of measurement positions and position information for the measurement positions, and a correlation profile at the time of the leakage determination including the cross-correlation function obtained from the measurement data measured at the pair of measurement positions and the position information for the measurement positions; and determining leakage.

Abstract: 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.

Abstract: 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.

Abstract: The system identifying device preferably includes 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 subtracter, a second subtracter 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 compactor for comparing the first and second output error means.

Abstract: 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.

Abstract: Converter 100 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, uses an estimated crosstalk value indicative of an estimated value of the amount of crosstalk of an echo leaking into the first signal to correct the first signal, and limits the corrected first signal not to be smaller than estimated near-end noise.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A system identifying device for identifying an unknown system interposed between first and second input terminals.

Abstract: 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.

Abstract: In a hands-free mode of speech communication, a loudspeaker produces acoustic energy of a distant signal from a far-end talker and a microphone produces a near-end signal containing a speech component representing the speech activity of a near-end talker or an acoustic echo component, or both. An echo replica is produced from the distant signal and a residual echo representing the difference between the near-end signal and the echo replica. The residual echo is used as a feedback signal to produce the echo replica. Using one of the near-end signal and the residual echo as a first input signal and the echo replica as a second signal, an estimate of the acoustic echo is produced when the speech activity of the near-end talker is low or zero. Using the acoustic echo estimate, the spectrum of the first input signal is shaped to produce a local signal for transmission to the far-end talker.

Abstract: 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.

Abstract: The adaptive digital filter of the present invention includes: a filter unit that includes a plurality of multipliers (3360-336N-1) that are divided into groups of at least one multiplier and the other multipliers based on expected values of filter coefficients and that generates first signals by means of convolution operations of an input signal and filter coefficients; an adder (338) that adds the input signal that is applied to at least one multiplier (336M-1) and first signals and supplies the results as second signals; and coefficient control unit (318 and 3190-319N-1) that control filter coefficients based on error between a target signal and an index value derived from the second signals.

Abstract: Converter 100 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, uses an estimated crosstalk value indicative of an estimated value of the amount of crosstalk of an echo leaking into the first signal to correct the first signal, and limits the corrected first signal not to be smaller than estimated near-end noise.

Abstract: 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.