The present invention relates to communication technologies and provides a method and a device for FSK/GFSK demodulation, the method comprises: determining a digital information vector group {V.sub.l(i)} of a codeword a[k] to be demodulated and a corresponding phase matching vector group {.sub.i(i)] within the duration of (2M+1)T; determining a received phase vector {tilde over ()}(i) of a received FSK/GFSK baseband signal (t, a); determining an average phase difference .sub.l between {tilde over ()}(i) and .sub.l(i); calculating the phase matching degree Q.sub.l between {tilde over ()}(i) and .sub.l(i) after removing the impact of the average phase difference .sub.l, and determining an l value corresponding to the phase matching degree Q.sub.l being the maximum; and determining the a[k], corresponding to the l value, in the digital information vector V.sub.i(i) as a demodulation result. Because the impact of the average phase difference is removed during phase matching, the accuracy of phase matching is increased, and the performance of the phase domain demodulation technology is improved.

A monitoring device comprising a monitoring pattern signal generating module, a calibration pattern signal generating module, a mixer module for mixing an input signal with the monitoring pattern signal and the calibration pattern signals, a recognition module configured to recognize the monitoring pattern signal, at least one calculation module for calculating at least one offset error and at least one gain error, a transmission module for transmitting a signal of proper operation or of faulty operation to a user device depending on whether the monitoring pattern signal is recognized or not recognized by the recognition module and a transmission module for transmitting a signal representative of the offset error and a signal representative of the gain error.

According to one embodiment, an antenna device includes an antenna, a first circuit, a second circuit and a control processing circuit. The antenna receives a radio wave signal and separates the radio wave signal into a right-hand circularly polarized wave signal and a left-hand circularly polarized wave signal. The first circuit divides the right-hand circularly polarized wave signal into a first right-hand circularly polarized wave signal and a second right-hand circularly polarized wave signal. The second circuit divides the left-hand circularly polarized wave signal into a first left-hand circularly polarized wave signal and a second left-hand circularly polarized wave signal. The control processing circuit detects a phase difference between the first right-hand circularly polarized wave signal and the first left-hand circularly polarized wave signal.

According to one embodiment, an antenna device includes an antenna, a first circuit, a second circuit and a control processing circuit. The antenna receives a radio wave signal and separates the radio wave signal into a right-hand circularly polarized wave signal and a left-hand circularly polarized wave signal. The first circuit divides the right-hand circularly polarized wave signal into a first right-hand circularly polarized wave signal and a second right-hand circularly polarized wave signal. The second circuit divides the left-hand circularly polarized wave signal into a first left-hand circularly polarized wave signal and a second left-hand circularly polarized wave signal. The control processing circuit detects a phase difference between the first right-hand circularly polarized wave signal and the first left-hand circularly polarized wave signal.

A method for demodulation including the following steps: exciting a vibrationally mounted, at least sectionally bar-shaped oscillating element for oscillating in the range of a resonance frequency of the oscillating element, wherein a temporally varying, in particular periodic, excitation signal is used for excitation, and wherein at least the temporal variation of the excitation signal is known or determined; detecting a modulated oscillation of the oscillating element by means of at least one sensor, wherein the sensor supplies a sensor measurement variable that varies versus time as a function of an amplitude and a phase of the modulated oscillation of the oscillating element. According to the present teaching, it is provided that the method includes the following step: generate a first comparison signal by amplitude modulating a known temporally varying, in particular periodic, demodulation signal by means of the temporally varying sensor measurement variable.

A method for demodulation including the following steps: exciting a vibrationally mounted, at least sectionally bar-shaped oscillating element for oscillating in the range of a resonance frequency of the oscillating element, wherein a temporally varying, in particular periodic, excitation signal is used for excitation, and wherein at least the temporal variation of the excitation signal is known or determined; detecting a modulated oscillation of the oscillating element by means of at least one sensor, wherein the sensor supplies a sensor measurement variable that varies versus time as a function of an amplitude and a phase of the modulated oscillation of the oscillating element. According to the present teaching, it is provided that the method includes the following step: generate a first comparison signal by amplitude modulating a known temporally varying, in particular periodic, demodulation signal by means of the temporally varying sensor measurement variable.

A monitoring device comprising a monitoring pattern signal generating module, a calibration pattern signal generating module, a mixer module for mixing an input signal with the monitoring pattern signal and the calibration pattern signals, a recognition module configured to recognize the monitoring pattern signal, at least one calculation module for calculating at least one offset error and at least one gain error, a transmission module for transmitting a signal of proper operation or of faulty operation to a user device depending on whether the monitoring pattern signal is recognized or not recognized by the recognition module and a transmission module for transmitting a signal representative of the offset error and a signal representative of the gain error.

A quadrature ADC feedback compensation system and method for MEMS gyroscope is disclosed. In an embodiment, a MEMS gyroscope comprises an analog processing chain including a drive circuit for generating an analog drive signal and a sense circuit that is configured to generate an analog rate signal and an analog quadrature signal in response to a change in capacitance output by the MEMS gyroscope. A compensation circuit coupled to the sense circuit is configured to null the analog quadrature signal using the analog drive signal and a compensation value, and to adaptively compensate, in a digital processing chain, a quadrature-induced rate offset of a digital rate signal over temperature using a digital quadrature signal, the compensation value and temperature data.

The inventive phase measuring device includes a first A/D converter 2 that digitizes a first periodical input signal X at each predetermined sampling timing and outputs the resultant signal as a digital signal Xd, a first zero-crossing identification means operable to detect a sign of Xd, a counting processing unit 4 that counts a difference in the number of times of zero-crossing detection by the first zero-crossing identification means and calculates the difference at each sampling timing, and a fraction processing unit 5 that computes a fraction of the number of times of zero-crossing detection on the basis of Xd at sampling timings immediately before and immediately after determination of zero-crossing by the first zero-crossing identification means. An averaging processing unit 6 performs averaging by adding up and totalizing the outputs from the counting processing unit 4 and the fraction processing unit 5, thereby computing a phase. The inventive device thus implements a digital phase measuring device and a digital phase difference measuring device that allow input of periodical signals in a wide frequency range and that are capable of accurate and real-time measurement.

The inventive phase measuring device includes a first A/D converter 2 that digitizes a first periodical input signal X at each predetermined sampling timing and outputs the resultant signal as a digital signal Xd, a first zero-crossing identification means operable to detect a sign of Xd, a counting processing unit 4 that counts a difference in the number of times of zero-crossing detection by the first zero-crossing identification means and calculates the difference at each sampling timing, and a fraction processing unit 5 that computes a fraction of the number of times of zero-crossing detection on the basis of Xd at sampling timings immediately before and immediately after determination of zero-crossing by the first zero-crossing identification means. An averaging processing unit 6 performs averaging by adding up and totalizing the outputs from the counting processing unit 4 and the fraction processing unit 5, thereby computing a phase. The inventive device thus implements a digital phase measuring device and a digital phase difference measuring device that allow input of periodical signals in a wide frequency range and that are capable of accurate and real-time measurement.