Abstract: An object is to prevent eavesdropping in quantum key distribution. A decoding unit decodes a quantum signal incident thereinto. A plurality of detect photons of the decoded quantum signal output from the decoding unit. A signal processing unit detects bits of the decoded quantum signal based on photon detection results of the plurality of detectors. A control unit perform switching processing by switching destinations to which two decoded quantum signals corresponding to one encoding basis are output between the plurality of detectors, and switching the bits detected by the signal processing unit based on the respective photon detection results of the plurality of detectors.

Abstract: An object is to prevent eavesdropping in quantum key distribution. A photon detector outputs an output current indicating a result of detecting a quantum signal. A current-voltage conversion unit converts the output current into an output voltage signal. An analog-to-digital converter outputs an output voltage signal obtained by analog-digital conversion of the output voltage signal. A signal processing unit performs predetermined signal processing on the output voltage signal, and outputs a photon detection signal indicating a result of detecting the quantum signal. When a time difference between a timing at which the quantum signal is incident into the photon detector and a reference timing determined based on a clock signal is not within a determination range, the photon detection signal is not output from the signal processing unit.

Abstract: The present invention addresses the problem of enabling another person to easily acquire the current status of a person who has difficulty transmitting information indicating the current status of said person's body to the other person. A detection unit 12 detects a physical amount based on pressure from at least a portion of a person's leg. A management unit 11 transmits prescribed information from a transmission unit 112 when the physical amount detected by the detection unit 12 satisfies a prescribed standard. The transmission unit 112 can also transmit, as prescribed information, information that is used to specify a position at which a transmission device 1 is present. Through this, the abovementioned problem is solved.

Abstract: A computer system having a PSG, a volume control circuit, a sound data output unit containing two channels of an ADPCM decoder each using a 32 kHz sampling frequency, a 32 bits CPU, an output control unit, and memories connected to the sound data output unit, the CPU, and the output control unit, respectively. So that the computer system has a high quality sound output function and can reproduce a sound data at high quality.

Abstract: Image data are transmitted for each unit of predetermined rasters. A start timing of transmission is controlled by a control unit to provide a suitable vertical position on a screen.

Abstract: A computer system having a control unit, a rounding circuit, and an ADPCM decoder. The control unit generates ADPCM sound data. The rounding circuits rounds a calculating value of the ADPCM sound data so that the ADPCM decoder reproduces original sound from the rounding value of the ADPCM sound data provided by the rounding circuit.

Abstract: Sound data are transmitted to an ADPCM decoder in synchronization with a horizontal synchronizing signal, according to which image data are transmitted.

Abstract: A computer system having a control unit, a storage, a first register for storing a scale value transmitted from the storage, a second register for storing ADPCM sound data transmitted from the storage, and an ADPCM decoder for reproducing sound in accordance with calculating the ADPCM sound data and the scale value and holding the ADPCM sound data and the scale value therein until next ADPCM sound data are transmitted thereto normally. The ADPCM decoder reproduces the sound from the middle of the ADPCM sound data by using the ADPCM sound data and scale value held therein.

Abstract: A computer system having a storage, calculating portion, an ADPCM decoder, and recovery portion. The recovery portion calculates a recovery value based on control data and an initial scale value and replaces a reproduced value with the recovery value if a reproducing operation stops halfway through a sound data. Thus, the ADPCM decoder reproduces sound from the middle of the sound data.

Abstract: Sound data are transmitted to an ADPCM decoder in synchronization with a horizontal synchronizing signal, according to which image data are transmitted.

Abstract: A RAM is accessed for each dot of an image to be displayed in accordance with a dot clock signal, and is accessed for each block in accordance with a system clock signal. These clock signals are selected to be used depending on the type of image data to be displayed in accordance with a microprogram.