Abstract:
To provide an oil type discrimination method and an oil type discriminator capable of accurately discriminating a type of oil even when light-shielding components exist in the oil and of preventing in advance erroneous discrimination of a mixture of oil.There are provided step S1 in which the transmission spectrum of near infrared light is measured, step S2 in which the transmission spectrum is converted into an absorbance spectrum, a first discrimination step S3 in which between gasoline type and non-gasoline type is discriminated by comparing the difference in absorbance between two wavelengths existing in the vicinities of respective attribute wavelengths of predetermined chemical bonds with 0.0, step S4 in which the first derivative spectrum of the absorbance is found, a second discrimination step S5 in which a value, which is obtained by multiplying respective first derivative values of absorbance of at least four wavelengths existing in the vicinities of respective attribute wavelengths of predetermined chemical bonds by respective coefficients and further adding a constant to the sum, is compared with 0.0 and thus between regular gasoline and high-octane gasoline is discriminated, and a third discrimination step S6 in which the difference in absorbance between two wavelengths existing in the vicinities of respective attribute wavelengths of predetermined chemical bonds is compared with 0.0 and thus between kerosene and diesel oil is discriminated.
Abstract:
To provide an oil type discrimination method and an oil type discriminator capable of accurately discriminating a type of oil even when light-shielding components exist in the oil and of preventing in advance erroneous discrimination of a mixture of oil.There are provided step S1 in which the transmission spectrum of near infrared light is measured, step S2 in which the transmission spectrum is converted into an absorbance spectrum, a first discrimination step S3 in which between gasoline type and non-gasoline type is discriminated by comparing the difference in absorbance between two wavelengths existing in the vicinities of respective attribute wavelengths of predetermined chemical bonds with 0.0, step S4 in which the first derivative spectrum of the absorbance is found, a second discrimination step S5 in which a value, which is obtained by multiplying respective first derivative values of absorbance of at least four wavelengths existing in the vicinities of respective attribute wavelengths of predetermined chemical bonds by respective coefficients and further adding a constant to the sum, is compared with 0.0 and thus between regular gasoline and high-octane gasoline is discriminated, and a third discrimination step S6 in which the difference in absorbance between two wavelengths existing in the vicinities of respective attribute wavelengths of predetermined chemical bonds is compared with 0.0 and thus between kerosene and diesel oil is discriminated.
Abstract:
A wide dispersion speaker system 1 comprises a cone type speaker unit 2, and a restricting element 10A. The restricting element 10A is provided with a center hole 11 at a center section thereof, and a peripheral hole 12 located outward relative to the center hole 11. The restricting element 10A has an annular sound travel inhibiting portion 19 positioned radially outward relative to the center hole 11 and radially inward relative to the peripheral hole 12. An outer end in a radial direction of the sound travel inhibiting portion 19 is positioned at a substantially middle point between an outer end in the radial direction of the center hole 11 and an outer end in the radial direction of the peripheral hole 12 or positioned radially outward relative to the substantially middle point.
Abstract:
A receiving unit (2) receives a modulated signal resulting from modulating a carrier signal with a digital encoded train resulting from error-correction encoding a digital signal train. A demodulating unit (4) demodulates the digital encoded train from the received modulated signal. A decoding unit (8) decodes the digital signal train from the demodulated digital encoded train. The receiving unit (2) outputs a received-signal strength indicative signal indicative of the received-signal strength of the modulated signal. During demodulating, a bit error rate computing unit (18) of the decoding unit (8) computes a bit error rate. The received-signal strength indicative signal and the bit error rate are inputted to a control unit (14), and, on the basis of these inputs, it is judged which one of the receiving conditions defined by received-signal strength indicative signals and bit error rates, the current receiving condition corresponds to.
Abstract:
A howling margin measuring device 20 comprises processing means 28 composed of gain controlling means 21 and a compressor 22 which are connected in series and controlling means 23. The gain controlling means 21 outputs an input sound signal after giving a gain thereto. If the level of a sound signal input to the compressor 22 is equal to or higher than a threshold level, the compressor 22 outputs the sound signal after compressing it with a specified ratio. The controlling means 23 is capable of controlling the gain of the gain controlling means 21 and reading the compression level of the compressor 22. The controlling means 23 reads the compression level of the compressor 22 while gradually increasing the gain of the gain controlling means 21, determines whether or not howling has been generated based on whether the read compression level has a value equal to or higher than a specified value, and calculates a howling margin based on the gain of the gain controlling means 21 when it is determined that howling has been generated.
Abstract:
A wireless microphone communication system 1 comprises one or more controllers 21 to 24 having LAN interfaces, one or more receivers 11 to 18 having the LAN interfaces and being configured to receive a radio wave from a transmitter of a wireless microphone. The one or more receivers 11 to 18 are coupled to the one or more controllers 21 to 24 on LAN. Each controller 21 to 24 is coupled to a corresponding display device. Each controller 21 to 24 receives, from the one or more receivers 11 to 18, information of the receiver through the LAN. Each controller 21 to 24 causes the received information of the receiver to be displayed on the corresponding display device.
Abstract:
Resonant frequencies f2 and f3 detected in a resonant space are determined as center frequencies of a dip. Based on measurement values at a speaker and a microphone in the resonant space, a basic amplitude frequency characteristic Ca and a target amplitude frequency characteristic Cd are found. A smoothness degree on a frequency axis is larger in the target amplitude frequency characteristic Cd than the basic amplitude frequency characteristic Ca. A damping level and quality factor of the dip are determined based on a difference between the basic amplitude frequency characteristic Ca and the target amplitude frequency characteristic Cd in the center frequencies f2 and f3 of the dip and frequencies near the center frequencies.
Abstract:
A wide dispersion speaker system 1 comprises a cone type speaker unit 2, and a restricting element 10A. The restricting element 10A is provided with a center hole 11 at a center section thereof, and a peripheral hole 12 located outward relative to the center hole 11. The restricting element 10A has an annular sound travel inhibiting portion 19 positioned radially outward relative to the center hole 11 and radially inward relative to the peripheral hole 12. An outer end in a radial direction of the sound travel inhibiting portion 19 is positioned at a substantially middle point between an outer end in the radial direction of the center hole 11 and an outer end in the radial direction of the peripheral hole 12 or positioned radially outward relative to the substantially middle point.