Abstract: A rate determination apparatus 1 includes a reception unit 2 configured to receive a transmission frame modulated by an FSK modulation scheme, a symbol rate detection unit 3 configured to detect a symbol rate based on a period of a preamble portion in the received transmission frame, a multilevel symbol detection unit 4 configured to detect a multilevel-modulated multilevel symbol based on a frequency deviation in the received transmission frame, and a bit rate determination unit 5 configured to determine a bit rate based on the detected symbol rate and the detected multilevel symbol. Then, the bit rate can be determined during communication.

Abstract: A radio frequency signal can be received in an intermediate frequency mode suitable for radio wave reception conditions. An oscillator has a variable oscillation frequency. A quadrature demodulator includes a frequency mixer and generates an intermediate frequency signal having an intermediate frequency lower than the frequency of the radio frequency signal. An ADC receives the intermediate frequency signal passed through an analog filter and converts the received intermediate frequency signal to a digital signal. A channel selection signal processing section generates a demodulated signal from the intermediate frequency signal converted to the digital signal. A mode control section switches the operating mode of the quadrature demodulator between a zero intermediate frequency mode and a low intermediate frequency mode in accordance with the radio wave reception conditions.

Abstract: There are included a standard deviation calculation unit that receives a plurality of acceleration data and calculates a standard deviation of the plurality of acceleration data for each specified time period, an average calculation unit that receives the plurality of acceleration data and calculates an average value of the acceleration data for each specified time period, a phase estimation unit that estimates a phase of the average value in a space having a first coordinate axis and a second coordinate axis by using the average value when the standard deviation is smaller than a specified threshold, and a phase correction unit that performs phase correction of the average value by using the estimated phase.

Abstract: A radio frequency signal can be received in an intermediate frequency mode suitable for radio wave reception conditions. An oscillator has a variable oscillation frequency. A quadrature demodulator includes a frequency mixer and generates an intermediate frequency signal having an intermediate frequency lower than the frequency of the radio frequency signal. An ADC receives the intermediate frequency signal passed through an analog filter and converts the received intermediate frequency signal to a digital signal. A channel selection signal processing section generates a demodulated signal from the intermediate frequency signal converted to the digital signal. A mode control section switches the operating mode of the quadrature demodulator between a zero intermediate frequency mode and a low intermediate frequency mode in accordance with the radio wave reception conditions.

Abstract: A rate determination apparatus 1 includes a reception unit 2 configured to receive a transmission frame modulated by an FSK modulation scheme, a symbol rate detection unit 3 configured to detect a symbol rate based on a period of a preamble portion in the received transmission frame, a multilevel symbol detection unit 4 configured to detect a multilevel-modulated multilevel symbol based on a frequency deviation in the received transmission frame, and a bit rate determination unit 5 configured to determine a bit rate based on the detected symbol rate and the detected multilevel symbol. Then, the bit rate can be determined during communication.

Abstract: There are included a standard deviation calculation unit that receives a plurality of acceleration data and calculates a standard deviation of the plurality of acceleration data for each specified time period, an average calculation unit that receives the plurality of acceleration data and calculates an average value of the acceleration data for each specified time period, a phase estimation unit that estimates a phase of the average value in a space having a first coordinate axis and a second coordinate axis by using the average value when the standard deviation is smaller than a specified threshold, and a phase correction unit that performs phase correction of the average value by using the estimated phase.

Abstract: To improve a quality of a combined signal obtained by maximum ratio combining performed when a transmission signal of OFDM system is diversity-received with a small computation amount or a small circuit size. In a receiving apparatus, a combining unit corrects, when combining a sub-carrier signal of each branch obtained by performing Fourier transform on a reception signal of each branch at a maximum ratio for each sub-carrier, a weighting coefficient of each branch according to a magnitude relation of an intensity of the reception signal of each branch before Fourier transform. Specifically, the combining unit corrects the weighting coefficient of each branch so as to weaken an influence of a transmission path response estimated for a sub-carrier signal of the branch in branches with smaller reception signal intensities.

Abstract: To improve a quality of a combined signal obtained by maximum ratio combining performed when a transmission signal of OFDM system is diversity-received with a small computation amount or a small circuit size. In a receiving apparatus, a combining unit corrects, when combining a sub-carrier signal of each branch obtained by performing Fourier transform on a reception signal of each branch at a maximum ratio for each sub-carrier, a weighting coefficient of each branch according to a magnitude relation of an intensity of the reception signal of each branch before Fourier transform. Specifically, the combining unit corrects the weighting coefficient of each branch so as to weaken an influence of a transmission path response estimated for a sub-carrier signal of the branch in branches with smaller reception signal intensities.

Abstract: To improve a quality of a combined signal obtained by maximum ratio combining performed when a transmission signal of OFDM system is diversity-received with a small computation amount or a small circuit size. In a receiving apparatus, a combining unit corrects, when combining a sub-carrier signal of each branch obtained by performing Fourier transform on a reception signal of each branch at a maximum ratio for each sub-carrier, a weighting coefficient of each branch according to a magnitude relation of an intensity of the reception signal of each branch before Fourier transform. Specifically, the combining unit corrects the weighting coefficient of each branch so as to weaken an influence of a transmission path response estimated for a sub-carrier signal of the branch in branches with smaller reception signal intensities.

Abstract: To improve a quality of a combined signal obtained by maximum ratio combining performed when a transmission signal of OFDM system is diversity-received with a small computation amount or a small circuit size. In a receiving apparatus, a combining unit corrects, when combining a sub-carrier signal of each branch obtained by performing Fourier transform on a reception signal of each branch at a maximum ratio for each sub-carrier, a weighting coefficient of each branch according to a magnitude relation of an intensity of the reception signal of each branch before Fourier transform. Specifically, the combining unit corrects the weighting coefficient of each branch so as to weaken an influence of a transmission path response estimated for a sub-carrier signal of the branch in branches with smaller reception signal intensities.

Abstract: There discloses a reel spring used in a magnetic tape of a video tape cassette comprising a base portion having apertures for installing a reel spring in an upper housing of a tape cassette and a pair of end portions extending at a certain angle to the plane of the base portion wherein first embossments are made longitudinally to improve a spring tension and second embossments are made to hold protruding pivots of tape reels between tips of the reel spring, spacing from the first embossments. The size of the second embossments is formed to be broad enough for the pivots' running smoothly and the second embossments project in a contrary direction to the bend of the end portions.