Abstract: A physiological signal processing apparatus for converting a physiological signal into sampling data having a predetermined frequency that is set according to the physiological signal includes an A/D converter and a computation unit. The A/D converter is configured to convert the physiological signal into high-speed sampling data by sampling the physiological signal at a frequency that is higher than the predetermined frequency. The computation unit is configured to convert the high-speed sampling data into sampling data having the predetermined frequency by setting time windows for the high-speed sampling data and calculating one representative value for each of the windows on the basis of high-speed sampling data in the window.

Abstract: A power supply device includes: a power supply circuit configured to supply power to a vital sensor; a capacitor electrically connected to the power supply circuit; a connector configured to supply power for charging the capacitor; and a shield case covering at least the power supply circuit and the capacitor to shield an electromagnetic wave.

Abstract: A differential amplifier is constituted of first emitter-follower transistors, second emitter-follower transistors, and amplification transistors whose bases are alternately connected to the emitters of the second emitter-follower transistors and whose collectors are connected to the emitters of the first emitter-follower transistors, as well as emitter resistors and constant current sources, whereby it is possible to reduce distortions of output signals in response to large-amplitude input signals, thus ensuring high-speed operation. It is possible to further incorporate base-grounded transistors and diodes, by which substantially the same collector-emitter voltage is applied to the emitter-follower transistors and amplification transistors, thus achieving the same power consumption and the same temperature variations with respect to these transistors.

Abstract: A differential amplifier is constituted of first emitter-follower transistors, second emitter-follower transistors, and amplification transistors whose bases are alternately connected to the emitters of the second emitter-follower transistors and whose collectors are connected to the emitters of the first emitter-follower transistors, as well as emitter resistors and constant current sources, whereby it is possible to reduce distortions of output signals in response to large-amplitude input signals, thus ensuring high-speed operation. It is possible to further incorporate base-grounded transistors and diodes, by which substantially the same collector-emitter voltage is applied to the emitter-follower transistors and amplification transistors, thus achieving the same power consumption and the same temperature variations with respect to these transistors.