摘要:
A digital signal receiving apparatus includes a detection-judging portion having a first smoothing filter generating a first smoothed signal by smoothing an auto-correlation signal and judging a possible presence of a desired signal when a signal level of the first smoothed signal is greater than a reference level and an absence of the desired signal when being smaller than the reference level. The smoothing filter includes a limiting portion limiting a fluctuation width of the first smoothed signal; and an adjusting portion configured to adjust the fluctuation width of the first smoothed signal limited by the limiting portion to be reduced while an elapsing time after the detection-judging means judges the possible presence of the desired signal is increasing.
摘要:
A frequency shift keying digital signal receiving apparatus includes a detecting portion detecting a new signal on the basis of a signal, from which a correlated ambient noise is filtered out by an adaptive filter, a holding portion holding a first electric power for the signal received before a new signal is detected, a calculating portion calculating a second electric power for the signal received after the new signal is detected, a comparing portion comparing levels of the first and second electric powers, a selector selecting the signal, from which the correlated ambient noise is filtered out, when the first electric power is higher than the second electric power and selecting the signal bypassing the adaptive filter when the first electric power is lower than the second electric power, and a demodulating portion demodulating a desired signal on the basis of the signal selected by the selecting portion.
摘要:
A nanocrystalline bolt, which serves as a high-strength bolt, is manufactured by the steps of compacting powder formed of nanocrystalline metal particles having a nanometer-scale grain size, extruding a resultant compact so as to obtain a rod stock, and subjecting the rod stock to a bolt-forming process (heading, machining, and form rolling) without involvement of heat treatment. Examples of metal material include JIS SUS410, precipitation-hardening-type 13Cr-8Ni-2Mo, and other stainless steels.
摘要:
An optical attenuator which provides almost the same degree of attenuation even when the difference in wavelength of two different kinds of input optical signals is small. Another optical attenuator is provided with a dopant concentration in a technically realizable range which increases the difference in optical attenuation of two different kinds of input optical signals. Almost the same degree of attenuation may be obtained even when the difference between wavelengths is small by canceling the wavelength dependency of attenuation of the dopant by raising the refractive index of an axially central portion of the core as compared to that of the peripheral portion of the core and by taking into account the type and area of the dopant and the ratio of the difference &Dgr;2 between the refractive indexes of the cladding and the axial portion of the core and the difference &Dgr;1 between the refractive index of the cladding and the refractive index of the peripheral portion, i.e., &Dgr;1/&Dgr;2. On the other hand, the difference of attenuation is increased while suppressing the concentration of dopant to the realizable range.
摘要:
An Amplitude Shift Keying (ASK) modulating circuit includes an oscillation circuit generating a pulse oscillation having a given frequency. A frequency divider is provided having a binary counter unit and having at least an input terminal, an output terminal and a reset terminal. The frequency divider is active and inactive when the reset terminal thereof is applied with low and high levels of a transmission signal wave, respectively, and divides the pulse oscillation while the frequency divider is active. The transmission signal wave is modulated together with a carrier frequency which is identical to the divided frequency.
摘要:
A remote control apparatus comprises a vehicle-mounted unit including a transmitter (26, 28, 23) for transmitting an ID request, a receiver (32, 33) for receiving a reply ID transmitted in response to the ID request, controller (31) for controlling the operation state of equipment (40, 60) depending on whether the receiver (32, 33) receives the ID, as well as a portable unit (10) for transmitting a reply ID in response to the ID request. When a hand sensor (1) provided in a door handle of a vehicle senses no hand and the receiver (32, 33) receives an ID, the controller (31) decreases the transmission power of the ID request. The hand sensor (1) comprises a slot antenna having an outside door handle, the surface of which is formed of a conductive material, a slit formed in the conductive material, and feeding points. The antenna is used for transmission of the ID request.
摘要:
A microstrip antenna device is disclosed as having three resonance frequencies comprising, a dielectric sheet whose thickness is smaller than the used wave length, a radiating conductor sheet which is disposed on one surface of the dielectric sheet and which is a rectangular shape and has line load in the center of one side of the rectangle, and a ground conductor sheet disposed on the other surface of the dielectric sheet.
摘要:
A GPS signal receiver has a PN code generator for producing a PN code identical to a PN code in a received GPS signal which is transmitted from a GPS satellite, the PN code produced by the PN code generator being controllable in phase, a PN code correlator for correlating the received GPS signal with the PN code produced by the PN code generator so as to code-strip the received GPS signal, a signal search unit for monitoring a correlated output signal from the PN code correlator and controlling the phase of the PN code produced by the PN code generator to search for a correlated output signal in excess of a predetermined value, a signal determining unit for determining the correlated output signal in excess of the predetermined value as being produced by a direct wave of the GPS signal, and a signal tracking unit for controlling the phase of the PN code produced by the PN code generator to track a peak of the correlated output signal that is determined as being produced by the direct wave of the GPS signal.
摘要:
A plug-type sealing assembly for hermetically closing a filler hole 24 of a lid 19 of a container 20, comprises: a plug 1 having a rod portion 3 in an upper part of which a large-diameter head portion 2 is formed, the rod portion 3 having a male screw 5 in its outer peripheral surface; and, a sleeve 8 provided with an axial through-hole together with a countersunk head portion 10 and a slit skirt portion 11 extending downward from a lower end of said countersunk head portion 10. In the through-hole, a female screw 15a, 15b is formed. In the container 20: through the filler hole 24 a sealant 23 is supplied between joint portions of the container 20 so that the container 20 is hermetically sealed; and, the sealing assembly is easily removed from the filler hole 24 to ensure that the sealant 23 is supplemented or replaced with a new one through the filler hole 24 in an easy and a safety manner, and easily mounted again in the filler hole 24 after completion of such supplementing or replacing operation of the sealant 23, by threadably engaging the male screw 5 of the plug 1 with and disengaging from the female screw 15a, 15b of the sleeve 8.
摘要:
The arm on which the idler pulley is supported as well as the tensioner which biases the arm to tension a timing belt or the like are both mounted on a common base plate. The plate is pivotally supported on the engine block and selectively secureable in a desired position. A stopper mechanism which can be used to temporarily disable the biasing and damping functions of the tensioner enables automatic tension setting.