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.

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.

Abstract: It is an object of the present invention to provide an electrochemical sensor which can prevent occurrence of cracks at the welding portion between a support tube made of lead-free glass and a sensitive glass membrane or ceramics, and a method for manufacturing the same. The electrochemical sensor 100 has a configuration such that the sensitive glass membrane 2A is welded to the support tube 1 made of lead-free glass with a lead glass layer 3A between the sensitive glass membrane 2A and the support tube 1. According to the present invention, there is also provided the electrochemical sensor in which the ceramics 2B for a junction is welded to the support tube 1 made of lead-free glass with a lead glass layer 3B between the ceramics 2B and the support tube 1.

Abstract: A noise eliminating apparatus includes a first microphone, a second microphone and a signal processing unit, the signal processing unit includes a linear prediction filter and a noise resynthesis filter, the linear prediction filter receives an output signal of the first microphone, predicts the output signal of the first microphone by linear prediction and generates a prediction signal, and the noise resynthesis filter is an adaptive filter which receives, as a main input signal, a first difference signal obtained by subtracting one of the output signal of the first microphone and the prediction signal from the other, receives, as an error signal, a second difference signal obtained by subtracting one of an output signal of the second microphone and an output signal of the noise resynthesis filter itself from the other, and updates a filter coefficient so that the error signal is minimized.

Abstract: To provide a wireless microphone device that enables a circuit board, which is to be provided with an oscillation circuit, to be decreased in size without deteriorating radiation characteristics. The wireless microphone device is configured to include: a circuit board 5 that is sectioned into circuit areas 11a and 11b and makes the respective circuit areas function as antenna elements of a dipole antenna; an oscillation circuit 21 that is arranged in the circuit area 11b and generates a high frequency signal on the basis of a voice signal from a microphone 2a; a feeding path for feeding the high frequency signal to an electrically conductive layer 11 in the circuit area 11b through a feeding point positioned on the circuit area 11a side distant from the oscillation circuit 21; and a high frequency shield covering at least a part of the feeding path.

Abstract: A transmitter (1) converts an input signal from a microphone (2) into a plural-bit digital signal by means of an A/D converter (4) at predetermined time intervals. An encoder (6) divides the digital signal into plural blocks and adds a parity bit to each block to thereby form a coded signal. A transmitting unit (8) modulates a carrier with the coded signal and transmits the modulated carrier through an antenna (10). A receiver (12) includes two tuning units (18A, 18B). Corresponding coded signals outputted from the tuning units (18A, 18B) are inputted to a decoder (20). The decoder (20) makes a parity check on respective blocks of the corresponding coded signals and selects and outputs an error-free one of the corresponding blocks of the corresponding coded signals.

Abstract: Digital audio data with error detection bits added thereto is inputted to an error detecting and correcting device (4). The correcting device (4) corrects an error when the error is detected in the digital audio data. The digital audio data outputted from the error detecting and correcting device (4) is inputted to an impulse noise suppressing circuit (6). The suppressing circuit (6) operates for a predetermined time period when the correcting device (4) detects an error.

Abstract: A method and an apparatus are provided for measuring trace ingredients in water, which make it possible to perform detection and quantitative determination of silica, phosphorus or arsenic in a sample solution. The method includes adding a molybdate ion to a sample solution under an acidic condition, then adding a fluorescent counter cationic pigment thereto, and measuring the time required for the fluorescence emitted by the resultant solution to be attenuated to a prescribed intensity. The measuring apparatus includes an excitation light source which irradiates excitation light to the above-modified solution; a fluorescence detector which detects the fluorescence emitted by the solution; means for measuring the time required for the fluorescence detected by the fluorescence detector to be attenuated to a prescribed intensity; and control means for determining the concentration of silica, phosphorus or arsenic in the sample solution from the time measurement.

Abstract: In some cases, constant directivity of a speaker system is desirably obtained in a wider frequency range. However, a speaker system using a constant directivity horn is frequently used in combination with a box speaker containing a woofer unit. Such a system becomes large in size. Furthermore, constant directivity is desirably obtained in a lower frequency. A speaker system 10 includes an enclosure 20, a first speaker unit 30 for low frequency and a plurality of second speaker units 31, 32, and 33 for high frequency. The enclosure 20 includes a front plate portion 21 which is a baffle plate and a rear plate portion 23. A length of the rear plate portion 22 in a first direction perpendicular to a forward and backward direction is shorter than a length of the front plate portion 21 in the first direction. The first speaker unit 30 and the second speaker units 31, 32, and 33 are mounted to the front plate portion 21. The plurality of second speaker units 31, 32, and 33 are arranged in the first direction.

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 broadcasting system which can monitor all input devices for their operating conditions, the broadcasting system includes input devices 11-1M for receiving sound, output devices 31-3N for broadcasting sound, and a controller 4. These features are interconnected through a network 2. In response to a broadcasting request from an arbitrary input device, the controller 4 delivers routing data indicative of a combination of the input device, which has made the broadcasting request, with an output device which should broadcast the sound from the input device to all the input devices 11-1M. The routing data includes priority data indicative of a priority thereof, so that a display unit of each input device makes a display based on the priority data included in the routing data when it receives the routing data from the controller 4.

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 device 1 for measuring a propagation time of a sound wave comprises a sound source means 11 and a calculation means 12. The sound source means 11 outputs a time stretched pulse as a sound source signal input to a speaker 3. The calculation means 12 calculates a cross-correlation function of the time stretched pulse and the sound signal which is output from the speaker 3 and is received in a microphone 4. Based on the cross-correlation function, the propagation time of the sound wave between the speaker 3 and the microphone 4 is found.