Abstract: A sleep state monitoring system is provided a pressure sensor, an optical sensor, and a controller. The pressure sensor detects a change in pressure of a pulse wave propagating through a blood vessel to measure a voltage value as a first voltage value of arterial pressure, and the optical sensor detects a change in pressure of a pulse wave propagating through the blood vessel by use of an optical signal to measure a voltage value as a second voltage value of a vascular pulse wave signal. The controller determines a sleep state of the human body, based on the first voltage value and the second voltage value.

Abstract: A fade state determination unit (5) determines that the target picture is in a fade state when a feature value A is equal to or larger than a threshold value TH_A. If the target picture has been determined to be in the fade state, a fade-in determination unit (6) determines that the target picture is of a fade-in type when a feature value B is equal to or larger than a threshold value TH_B1 and a feature value C is less than a threshold value TH_C. If the target picture has been determined to be in the fade state, a fade-out determination unit (7) determines that the target picture is of a fade-out type when the feature value B is less than a threshold value TH_B2 that is smaller than the threshold value TH_B1. A cross-fade determination unit (8) determines that the target picture is of a cross-fade type when the target picture has been determined to be in the fade state and be not of the fade-in type nor of the fade-out type.

Abstract: A fade state determination unit (5) determines that the target picture is in a fade state when a feature value A is equal to or larger than a threshold value TH_A. If the target picture has been determined to be in the fade state, a fade-in determination unit (6) determines that the target picture is of a fade-in type when a feature value B is equal to or larger than a threshold value TH_B1 and a feature value C is less than a threshold value TH_C. If the target picture has been determined to be in the fade state, a fade-out determination unit (7) determines that the target picture is of a fade-out type when the feature value B is less than a threshold value TH_B2 that is smaller than the threshold value TH_B1. A cross-fade determination unit (8) determines that the target picture is of a cross-fade type when the target picture has been determined to be in the fade state and be not of the fade-in type nor of the fade-out type.

Abstract: A vessel pulse wave measurement system performs vessel pulse wave measurement using an optical probe circuit provided with an optical probe including a light emitting element and a light receiving element, a drive circuit, and a detection circuit. A measurement device directly and synchronously feeds back an electrical signal from the optical probe to the drive circuit as a drive signal to generate a self-oscillation signal from the detection circuit, and measures the self-oscillation signal as a vessel pulse wave signal. A controller controls an operating point of at least one of the detection circuit and the drive circuit such that the self-oscillation signal substantially reaches a maximum level thereof.

Abstract: A vessel pulse wave measurement system performs vessel pulse wave measurement using an optical probe circuit provided with an optical probe including a light emitting element and a light receiving element, a drive circuit, and a detection circuit. A measurement device directly and synchronously feeds back an electrical signal from the optical probe to the drive circuit as a drive signal to generate a self-oscillation signal from the detection circuit, and measures the self-oscillation signal as a vessel pulse wave signal. A controller controls an operating point of at least one of the detection circuit and the drive circuit such that the self-oscillation signal substantially reaches a maximum level thereof.

Abstract: A vessel pulse wave measurement system performs vessel pulse wave measurement using an optical probe circuit provided with an optical probe including a light emitting element and a light receiving element, a drive circuit, and a detection circuit. A measurement device directly and synchronously feeds back an electrical signal from the optical probe to the drive circuit as a drive signal to generate a self-oscillation signal from the detection circuit, and measures the self-oscillation signal as a vessel pulse wave signal. A controller controls an operating point of at least one of the detection circuit and the drive circuit such that the self-oscillation signal substantially reaches a maximum level thereof.