Abstract: A wireless plethysmogram sensor unit is capable of obtaining a plethysmogram from a living tissue of a measuring object and of transmitting the plethysmogram to a processing unit outside the wireless plethysmogram sensor unit. The sensor unit includes a light source to emit measuring light into the living tissue and a light receiving element to receive light emerging from the tissue, which is accompanied by pulsation caused by absorption by arteries in the tissue. A memory stores a plethysmogram obtained in accordance with the light received by the light receiving element. A short range wireless communicator transmits the plethysmogram to the processing unit. A power source provides power to other elements in the sensor unit, and a controller controls the elements of the sensor unit.

Abstract: The plethysmogram sensor disclosed in this specification includes a light emitting portion whose output is variable, a light receiving portion to detect a light emitted from the light emitting portion and penetrates a living body of a measured person, and a processing unit to acquire information about the plethysmogram of the measured person based on a measured value provided from the light receiving portion.

Abstract: Disclosed herein is a signal processing apparatus including a plurality of frame head detection sections configured to determine whether a frame head complying with any one of a plurality of different communication methods is detected by comparing the waveform of a signal sent from an external apparatus with a plurality of predetermined different symbol patterns; a communication method selection section configured to select the communication method for communicating with the external apparatus based on results of the determination by the frame head detection sections and on the priority of each of the plurality of communication methods; and a priority changing section configured such that if a second communication method different from an initially selected first communication method is selected anew, then the priority changing section changes the priority of each of the plurality of communication methods based on the newly selected second communication method.

Abstract: Disclosed herein is a signal processing device including: a correlation signal output unit configured to, about a received signal transmitted from another device, calculate a correlation value between the received signal and a pattern of a waveform of a known signal and output the calculated correlation value as a correlation signal in a time corresponding to one symbol; a known signal determiner configured to determine, based on the correlation signal, whether or not the received signal is modulated by the known signal in a first interval defined when the time corresponding to one symbol is divided into a plurality of intervals; and an identifier configured to identify a series of the symbol based on a result of the determination.

Abstract: Disclosed herein is a demodulation apparatus including: an operation determination block configured to determine whether the demodulation apparatus operates as part of either a first device or a second device with which the demodulation apparatus communicates, the first device being configured to ASK-modulate and transmit data, the second device being configured to load-modulate and transmit data; and first and second demodulation control blocks.

Abstract: A decoding apparatus includes a memory and a receiving unit and is adapted to decode data in units of codewords each including a parity part. The memory has a storage capacity capable of storing at least data with a length equal to the length of one codeword. The receiving unit receives, as received values, elements of a codeword in a bit-interleaved form, performs bit deinterleaving and parity permutating on the received values, and stores the resultant received values in the memory.