Abstract: An electronic device includes: a detection circuit to detect a voltage difference between both ends of a wiring portion which is at least a portion of a power supply wiring that connects a power supply circuit and a receiver circuit; a current supply circuit to supply a pilot current having a first current value which is smaller than a second current value of a main current to the power supply wiring; and a control circuit to control supply of the pilot current and stop of the supply of the pilot current, to calculate a wiring resistance value of the wiring portion based on a first value of the voltage difference when the supply is stopped, a second value of the voltage difference when the pilot current is supplied, and the first current value and to calculate the second current value based on the first value and the wiring resistance value.

Abstract: An electronic device includes: a detection circuit to detect a voltage difference between both ends of a wiring portion which is at least a portion of a power supply wiring that connects a power supply circuit and a receiver circuit; a current supply circuit to supply a pilot current having a first current value which is smaller than a second current value of a main current to the power supply wiring; and a control circuit to control supply of the pilot current and stop of the supply of the pilot current, to calculate a wiring resistance value of the wiring portion based on a first value of the voltage difference when the supply is stopped, a second value of the voltage difference when the pilot current is supplied, and the first current value and to calculate the second current value based on the first value and the wiring resistance value.

Abstract: An optical transmission system (1) alters quantity of incident light by reflecting an optical signal by a micro mirror (11) to enter an optical fiber (13) and by controlling an angle of the micro mirror (11), so that attenuation of the optical signal is controlled. An optical filter (14) is disposed between the micro mirror (11) and the optical fiber (13), for correcting a relationship between a control angle or control voltage of the micro mirror (11) and attenuation of the optical signal to be close to a linear relationship.

Abstract: An electrode includes a fixed electrode and a movable electrode. The electrode drives a mirror disposed on the side of the movable electrode by generating electrostatic force between the fixed electrode and the movable electrode when voltage is applied. The fixed electrode and the movable electrode are formed so that a distance between the fixed electrode and the movable electrode increases as an overlapping area between the fixed electrode and the movable electrode increases.

Abstract: An optical switch system has a plurality of micro mirrors arranged in a plane, and an angle of each of the micro mirrors can be controlled for reflecting an optical signal entered from one or more input ports so that the reflected optical signal enters a selected output port of one or more output ports. The optical switch system includes a storage portion for storing connection information between the input port and the output port, a correction quantity obtaining portion for obtaining a correction quantity for a cross talk generated between neighboring micro mirrors among the plurality of micro mirrors, a computing portion for determining a controlling quantity of the micro mirror in accordance with the connection information and the correction quantity, and a drive output portion for driving the micro mirror in accordance with the controlling quantity.

Abstract: In a digital filter device which filters a plurality of signals by a single digital filter, an input data memory stores the input data strings generated by computing processors, and a digital filter reads the input data strings in a predetermined sequence to be filtered and generates output data strings. An output data memory stores the output data strings, and a data processor reads the output data strings in a predetermined sequence to be processed. Furthermore, a filter memory and coefficient memories respectively store data-under-calculation and a filter coefficient in a delay circuit included in the digital filter.

Abstract: An optical transmission system (1) alters quantity of incident light by reflecting an optical signal by a micro mirror (11) to enter an optical fiber (13) and by controlling an angle of the micro mirror (11), so that attenuation of the optical signal is controlled. An optical filter (14) is disposed between the micro mirror (11) and the optical fiber (13), for correcting a relationship between a control angle or control voltage of the micro mirror (11) and attenuation of the optical signal to be close to a linear relationship.

Abstract: An optical switch system has a plurality of micro mirrors arranged in a plane, and an angle of each of the micro mirrors can be controlled for reflecting an optical signal entered from one or more input ports so that the reflected optical signal enters a selected output port of one or more output ports. The optical switch system includes a storage portion for storing connection information between the input port and the output port, a correction quantity obtaining portion for obtaining a correction quantity for a cross talk generated between neighboring micro mirrors among the plurality of micro mirrors, a computing portion for determining a controlling quantity of the micro mirror in accordance with the connection information and the correction quantity, and a drive output portion for driving the micro mirror in accordance with the controlling quantity.

Abstract: A stabilization apparatus according to the present invention comprises a stopper which is in contact under pressure with one side face of a movable body capable of swinging around a torsion bar, this one side face being vertical to an axial direction of the movable body, to damp the movable body. The stopper is displaced between a first position at which the stopper is in contact under pressure with the side face of the movable body, and a second position apart from the side face, according to a drive voltage applied to a stopper electrode. The drive voltage for the stopper electrode is controlled by a control section at the appropriate timing according to a drive condition of the movable body. As a result, the resonance operation can be reliably suppressed even when an angle of the movable mirror is changed at a high speed, and thus, it becomes possible to stabilize the movable mirror to be in a desired state in a short time.

Abstract: In a digital filter device which filters a plurality of signals by a single digital filter, an input data memory stores the input data strings generated by computing processors, and a digital filter reads the input data strings in a predetermined sequence to be filtered and generates output data strings. An output data memory stores the output data strings, and a data processor reads the output data strings in a predetermined sequence to be processed. Also, a switch table for associating an address of the input data memory in which the input data strings are stored with an address of the output data memory in which the output data strings are stored is provided, and based on this switch table, a switching controller provides timings of reading the input data strings out of the input data memory and of writing the input data strings as the output data strings into the output data memory through the digital filter.

Abstract: A transmission system is provided having a sender side apparatus, a receiver side apparatus, and a transmission line connecting the sender and receiver side apparatuses. The sender side apparatus provides a selector for receiving image data signals of a plurality of channels in parallel and, frame by frame, selects an image data signal of one of the plurality of channels for each frame. The selector discards the image data signals of the other of the plurality of channels. A coding unit codes the image data signal which is selected for each frame by the selector, by interframe difference coding. A monitoring unit monitor data amounts of interframe differences in the image data signals of the respective channels. A control unit determines which one of said plurality of channels is to be selected by the selector, based on the data amounts of interframe differences in the image data signals of the respective channels, and adaptively controls the selector in accordance with this determination.