Abstract: An information terminal device according to the present disclosure includes a reception unit that receives, from a refrigerator, operating information having outline information and analysis information, a display unit that switchably displays a first display screen for displaying the outline information and a second display screen for displaying the analysis information, and a switching unit of switching between the first display screen and the second display screen. The analysis information includes at least some of the outline information. The outline information includes a history of detected values of a temperature detector that detects a temperature of a storeroom of the refrigerator. The analysis information includes the history of the detected values of the temperature detector and a history of operations of a functional component of the refrigerator.

Abstract: An information processing device includes a question provider that outputs questions for specifying a cause of a defect of a device or a countermeasure for the cause of the defect, a response receiver that receives responses to the questions output by the question provider, a defect cause specifier that specifies the cause of the defect of the device or the countermeasure for the cause of the defect on the basis of the responses received by the response receiver, and an operation history information receiver that receives operation history information of the device. The question provider varying the questions that are to be output, on the basis of the operation history information received by the operation history information receiver.

Abstract: An information processing device includes a question provider that outputs questions for specifying a cause of a defect of a device or a countermeasure for the cause of the defect, a response receiver that receives responses to the questions output by the question provider, a defect cause specifier that specifies the cause of the defect of the device or the countermeasure for the cause of the defect on the basis of the responses received by the response receiver, and an operation history information receiver that receives operation history information of the device. The question provider varying the questions that are to be output, on the basis of the operation history information received by the operation history information receiver.

Abstract: An information notification apparatus includes a first reception unit that receives a first state change notification indicating that the operating state of an electrical appliance has changed to a first state, a transmission unit that transmits a state notification indicating that the operating state of the electrical appliance is the first state to an information terminal, and a second reception unit that receives an acknowledgement notification. The first reception unit further receives a second state change notification indicating that the electrical appliance has been changed to a second state from the electrical apparatus.

Abstract: An AGC unit starts a gain control of the variable gain amplifying unit when a bit saturation occurs in the digital baseband signal output from the A/D converting unit, and starts a gain control of the variable gain amplifying unit when a detection of STS from the digital baseband signal output from the A/D converting unit is started. The AGC unit performs the gain control of the variable gain amplifying unit once when the detection of STS is started, and performs the gain control of the variable gain amplifying unit twice when the bit saturation occurs, namely a larger number of times than when the detection of STS is started.

Abstract: An information notification apparatus includes a first reception unit that receives a first state change notification indicating that the operating state of an electrical appliance has changed to a first state, a transmission unit that transmits a state notification indicating that the operating state of the electrical appliance is the first state to an information terminal, and a second reception unit that receives an acknowledgement notification. The first reception unit further receives a second state change notification indicating that the electrical appliance has been changed to a second state from the electrical apparatus.

Abstract: In a receiver, a channel estimation unit estimates channel characteristics of each channel, and a weight generation unit generates a weight matrix used in equalization processing by an equalizer in accordance with the estimated values of channel characteristics for each channel as estimated by the channel estimation unit. Furthermore, a likelihood calculation unit calculates a likelihood indicating a degree of certainty for each transmission stream using the weight matrix generated by the weight generation unit, and an adaptive control unit determines a transmission rate appropriate for transmission of a signal from a transmitter to the receiver in accordance with the likelihood of each transmission stream calculated by the likelihood calculation unit, notifying the transmitter of the determined transmission rate.

Abstract: The noise amount information storage unit 161 stores noise amount information which indicates relationships between gain value of the variable gain amplification units 121 and 125 and the amount of noise included in BB signals output from the down converters 131 and 135. The AGC unit 140 controls the gain value of the variable gain amplification units 121 and 125 so that the power of BB signals output from the down converters 131 and 135 becomes constant. The noise amount estimation unit 162 estimates noise amount of noise corresponding to the controlled gain value of the variable gain amplification units 121 and 125 by referring to the noise amount information stored in the noise amount information storage unit 161. The weight generation unit 170 generates weight matrix based on results of estimations performed by the channel characteristic estimation unit 150 and the noise estimation unit 162.

Abstract: An FFT unit (170) separates a received symbol by Fourier conversion into a plurality of subcarriers, and a phase difference detection unit (193) detects a phase difference between 4 pilot carriers and data carriers adjacent to the pilot carriers (adjacent carriers) The decision unit (194) decides whether the phase differences between the pilot carriers and the adjacent carriers detected by the phase difference detection unit (193) fulfill a phase difference condition. Then, the decision unit (194) decides that the received symbol is an HTSIG if the number of phase differences that fulfill the phase difference condition is greater than or equal to a predetermined number, and decides that the received symbol is either a SIG or a DATA if the number of phase differences that fulfill the phase difference condition is less than the predetermined number.

Abstract: At a time T131, a wireless communication apparatus 11A determines to transmit a data packet, and then performs interference signal detection for a period TA. At a time T132, which precedes a time T133 at which the period TA has elapsed since the time T131, the wireless communication apparatus 11A detects a data packet d21 (an interference signal). At a time T134, at which a period TB has elapsed since the time T132 at which the interference signal has been detected, the wireless communication apparatus 11A starts transmitting a data packet d11 to a wireless communication apparatus 12A. At a time T136, the wireless communication apparatus 11A completes the transmission of the data packet d11.

Abstract: Interfering signals coming at random timings from different radio stations are identified. In order to attain this, a method for storing the characterizing quantity of an interfering signal included in a received signal includes calculating the characterizing quantity of the received signal, determining a probability that a desired signal is included in the received signal, determining that the received signal is an interfering signal when determining that there is no probability that the desired signal is included in the received signal, and storing the characterizing quantity of the received signal as an interfering signal characterizing quantity when it is determined at the received signal determination step that there is no probability that the desired signal is included in the received signal.

Abstract: A correlation unit (32) sequentially obtains correlation values between a baseband signal and a reference signal and outputs the obtained reference signal to a section division unit (33). The output of the correlation unit (32) is divided into symbol time periods by the section division unit (33). A section position detection unit (34) detects a largest correlation value in each of sections resulting from the division by the correlation unit (32) and outputs, to a synchronization judgment unit (35), first position information that indicates a relative position of each detected largest correlation value. The synchronization judgment unit (35) detects an arrival of a packet signal and estimates a symbol timing based on the first position information of the sections.

Abstract: A radio communication device that, even if it is interfered by a radio transmission station other than a radio transmission station with which it intends to communicate, estimates a signal transmitted from the intended radio transmission station by taking into account the influence of the interference, by obtaining an estimator of “s” that denotes a column vector representing a signal transmitted from the radio transmission station, in accordance with a following expression: s=RssHH(HRssHH+Ruu)?1r, where “Rss” denotes a covariance matrix of the column vector “s”, “r” denotes a column vector representing the signal received by the signal receiving unit, “H” denotes a matrix being the numerical sequence calculated by the first calculating unit, “Ruu” denotes a covariance matrix being the numerical sequence calculated by the second calculating unit, “H” denotes a complex conjugate transposition, and “?1” denotes an inverse matrix.

Abstract: A CPU 14 detects a value of an output bit rate of media data output from a buffer 17, detects a value of a free space of the buffer 17, and divides a value resulted from subtracting a decrease ratio set value from the detected value of the free space by a saved period. As a result, a value of a decrease ratio is obtained. In order to decrease a value of an input bit rate of media data input to the buffer 17 in accordance with the value of the output bit rate, the CPU 14 decreases the value of the input bit rate based on an upper limit of the input bit value that is a value resulted from adding the detected value of the output bit rate and the calculated value of the decrease ratio.

Abstract: The noise amount information storage unit 161 stores noise amount information which indicates relationships between gain value of the variable gain amplification units 121 and 125 and the amount of noise included in BB signals output from the down converters 131 and 135. The AGC unit 140 controls the gain value of the variable gain amplification units 121 and 125 so that the power of BB signals output from the down converters 131 and 135 becomes constant. The noise amount estimation unit 162 estimates noise amount of noise corresponding to the controlled gain value of the variable gain amplification units 121 and 125 by referring to the noise amount information stored in the noise amount information storage unit 161. The weight generation unit 170 generates weight matrix based on results of estimations performed by the channel characteristic estimation unit 150 and the noise estimation unit 162.

Abstract: In a receiver 20, a channel estimation unit 203 estimates channel characteristics of each channel, and a weight generation unit 204 generates a weight matrix used in equalization processing by an equalizer 206 in accordance with the estimated values of channel characteristics for each channel as estimated by the channel estimation unit 203. Furthermore, a likelihood calculation unit 205 calculates a likelihood indicating a degree of certainty for each transmission stream using the weight matrix generated by the weight generation unit 204, and an adaptive control unit 211 determines a transmission rate appropriate for transmission of a signal from a transmitter to the receiver 20 in accordance with the likelihood of each transmission stream calculated by the likelihood calculation unit 205, notifying the transmitter of the determined transmission rate.

Abstract: An AGC unit 111 starts a gain control of the variable gain amplifying unit 102 when a bit saturation occurs in the digital baseband signal output from the A/D converting unit 104, and starts a gain control of the variable gain amplifying unit 102 when a detection of STS from the digital baseband signal output from the A/D converting unit 104 is started. The AGC unit 111 performs the gain control of the variable gain amplifying unit 102 once when the detection of STS is started, and performs the gain control of the variable gain amplifying unit 102 twice when the bit saturation occurs, namely a larger number of times than when the detection of STS is started.

Abstract: In a transfer apparatus to which MIMO-OFDM is applied, a data transmission method and a data reception method are provided in which, even when there are frequency errors varying among transfer paths, the precision of estimation of an inverse propagation coefficient function can be improved, thereby making it possible to suppress a degradation in characteristics. Among symbols composed of a plurality of subcarriers orthognal to each other, the transfer apparatus uses, as a synchronization symbol, a symbol in which predetermined amplitudes and phases are assigned to a plurality of subcarriers spaced at predetermined frequency intervals. The synchronization symbol is divided into transmission antennas to generate a plurality of synchronization subsymbols, which are in turn simultaneously transmitted from a plurality of transmission antennas.

Abstract: An FFT unit (170) separates a received symbol by Fourier conversion into a plurality of subcarriers, and a phase difference detection unit (193) detects a phase difference between 4 pilot carriers and data carriers adjacent to the pilot carriers (adjacent carriers) The decision unit (194) decides whether the phase differences between the pilot carriers and the adjacent carriers detected by the phase difference detection unit (193) fulfill a phase difference condition. Then, the decision unit (194) decides that the received symbol is an HTSIG if the number of phase differences that fulfill the phase difference condition is greater than or equal to a predetermined number, and decides that the received symbol is either a SIG or a DATA if the number of phase differences that fulfill the phase difference condition is less than the predetermined number.

Abstract: A correlation unit (32) sequentially obtains correlation values between a baseband signal and a reference signal and outputs the obtained reference signal to a section division unit (33). The output of the correlation unit (32) is divided into symbol time periods by the section division unit (33). A section position detection unit (34) detects a largest correlation value in each of sections resulting from the division by the correlation unit (32) and outputs, to a synchronization judgment unit (35), first position information that indicates a relative position of each detected largest correlation value. The synchronization judgment unit (35) detects an arrival of a packet signal and estimates a symbol timing based on the first position information of the sections.