Abstract: A measuring device includes a stimulation instructing unit and an estimating unit. The stimulation instructing unit is configured to instruct a stimulating device to generate a plurality of stimulations corresponding to at least three fiducial points of brain anatomy data, the at least three fiducial points having been defined in the brain anatomy data. The estimating unit is configured to estimate, based on sensor output signals output from sensors configured to measure a brain activity signal of a subject who is a target to be measured, parts where brain activities occur due to the plurality of stimulations.

Abstract: An amplifier 11 to which transistors 13 and 14 functioning as variable resistors are connected in parallel is used. A burst signal is received by a light receiving element 10 and the received signal is converted into an input current signal Iin. The input current signal Iin is converted in the amplifier 11 into an output voltage Vo. Determination is made in a determining circuit 20 as to whether the output voltage Vo exceeds a current voltage V1 which is a threshold. The result of determination is stored in a register circuit 15. Based on the result of determination outputted from the register circuit 15, a desired voltage is selected from among a number of voltages generated beforehand in a control voltage generating circuit. The selected voltage is used to generate a control voltage Vg1 or Vg2 to be applied to the transistors 13 and 14; and the generated control voltage Vg1 or Vg2 is inputted to the transistor 13 or 14 of the amplifier 11.

Abstract: A superconducting coil system comprising a superconducting coil and a normal conducting coil, the normal conducting coil having a current time constant (L2/R2) which is larger than L1/R1, or the time constant at which the current through the superconducting coil decays rapidly after the conductors in the superconducting coil made a transition to the normal conducting state, in which L1 and L2 represent the self-inductances of the superconducting coil and the normal conducting coil, respectively, R1 represents the resistance for causing rapid decay of the current flow through the superconducting coil, and R2 represents the resistance of the normal conducting coil.

Abstract: An amplifier 11 to which transistors 13 and 14 functioning as variable resistors are connected in parallel is used. A burst signal is received by a light receiving element 10 and the received signal is converted into an input current signal Iin. The input current signal Iin is converted in the amplifier 11 into an output voltage Vo. Determination is made in a determining circuit 20 as to whether the output voltage Vo exceeds a current voltage V1 which is a threshold. The result of determination is stored in a register circuit 15. Based on the result of determination outputted from the register circuit 15, a desired voltage is selected from among a number of voltages generated beforehand in a control voltage generating circuit. The selected voltage is used to generate a control voltage Vg1 or Vg2 to be applied to the transistors 13 and 14; and the generated control voltage Vg1 or Vg2 is inputted to the transistor 13 or 14 of the amplifier 11.

Abstract: A superconducting coil system comprising a superconducting coil and a normal conducting coil, the normal conducting coil having a current time constant (L2/R2) which is larger than L1/R1, or the time constant at which the current through the superconducting coil decays rapidly after the conductors in the superconducting coil made a transition to the normal conducting state, in which L1 and L2 represent the self-inductances of the superconducting coil and the normal conducting coil, respectively, R1 represents the resistance for causing rapid decay of the current flow through the superconducting coil, and R2 represents the resistance of the normal conducting coil.

Abstract: A double surface machining system for machining both side surfaces of a workpiece comprises, in an operational state, a pair of upper and lower spindle heads to be vertically positioned and driven, respectively, a pair of upper and lower spindles provided for the upper and lower spindle heads, respectively, in parallel to each other, to be rotatable about horizontal axes thereof, the upper and lower spindles having front ends to which tools are mounted, respectively, a pair of upper and lower workpiece supports for supporting the workpiece therebetween, which are vertically positioned and driven on one side of the upper and lower spindle heads as viewed from a workpiece feed direction, respectively, and another pair of upper and lower workpiece supports for supporting the workpiece therebetween, which are vertically positioned and driven on another one side of the upper and lower spindle heads as viewed from a workpiece feed direction, respectively.

Abstract: A digital video signal reproducing apparatus comprises a reproducing circuit for reproducing a digital video signal from a recording medium, where the recording medium is time-sequentially recorded with the digital video signal having a signal format in which a header signal is added to each of divided picture element data groups which are obtained by dividing a picture element data group in terms of a predetermined unit, the picture element data group is obtained by subjecting an analog video signal to a digital pulse modulation at a sampling frequency such that a product of a number of picture element data in one scanning line and an effective number of scanning lines in one picture of a standard television system is exceedingly close to 2.sup.18 but less than 2.sup.

Abstract: A digital video signal recording system and reproducing apparatus comprise a circuit for independently subjecting a luminance signal and two kinds of color difference signals of a color picture information to digital pulse modulation, to produce a digital luminance signal and two kinds of digital color difference signals, a circuit for dividing the digital luminance signal and the two kinds of digital color difference signals into picture element data groups, in terms of specific number of rows or columns which are adjacent on a screen, and adding a header signal at least comprising a synchronizing signal, a picture mode identification code, and a picture information quantity identification code to a beginning position of each of the divided picture element data groups comprising the digital luminance signal and the two kinds of digital color difference signals, to produce a digital video signal having a signal format in which the digital luminance, the two kinds of digital color difference signals, and the h

Abstract: A system for obtaining synchronized reproduction from a plurality of reproducing apparatuses by obtaining mutually synchronized reproduced signals from a plurality of reproducing apparatuses, where the plurality of reproducing apparatuses respectively reproduces recorded signals from a recording medium in which mutually identical address signals are recorded for each predetermined data signal block.

Abstract: A monaural signal to artificial stereo signals converting and processing circuit for headphones comprises, a circuit which converts a monaural signal into artificial stereo signals, a circuit which adds localizing information of imaginary sources to the artificial stereo signals thus obtained, and a circuit which adds imaginary indirect sounds to the artificial stereo signals added with the localizing information. Due to the addition of the indirect sounds, the sound expansion felt by a listener listening to a headphone expands to regions outside the listener's head.

Abstract: A dummy head for use in recording binaural sounds includes a pick-up for the sounds in the form of two microphones. The head comprises a pair of simulated ears, each having a single smooth three-dimensional, curved surface extending radially in all directions so the inner surface of an auditory canal is continuous with the curved surface and the junction area between them is smoothly curved, to improve the frequency characteristics of the output signals of the microphones. The microphone is located in each ear.

Abstract: A binaural sound reproducing system includes a transducer for translating the recorded binaural information into an electrical signal on each of separate channels and a convolution integrator on each separate channel connected to receive the output from the transducer to compensate for acoustical differences resulting from the facial difference between the dummy head used for recording the binaural signal and a particular listener.

Abstract: A binaural four-channel stereophony comprises at least two dummy heads each provided with microphones at the ears of the dummy to pick up signals from various sound sources or groups of sound sources. The binaural signals representing each sound source or a group of sound sources are coupled to an acoustic crosstalk cancellation circuit and eventually applied to two front or two rear loudspeakers. Each sound source or group of sound sources is localized between adjacent ones of the four speakers to simulate the binaural effect produced in a closed-circuit type binaural sound reproducing system.