Abstract: An audio processing apparatus has converting means for converting n-channel (positive integral number: n?1) audio signals input from at least one sound source into two-channel signals, a pair of correcting filter means to which a pair of two-channel signals converted by the converting means are supplied and which corrects a difference of the sense of hearing due to a difference of headphone characteristics, and an output section for supplying a pair of output signals from the pair of correcting filter means to right and left speaker units of a headphone.

Abstract: An audio signal processing device to enable accurate calculation of angles and displacements and to enable reduction of circuit scales includes a digital signal processing circuit (31) that performs virtual acoustic image localization processing such that an acoustic image is localized at an arbitrary position in the vicinity of the listener by reproducing, using headphones (2) or a plurality of speakers, output signals obtained by signal processing input audio signals, and is characterized in that analog detection signals from a sensor (1) that detects the state of action of the listener are input to the digital signal processing circuit (31) via an A/D converter (30), and the transmission characteristics of these audio signals are modified in realtime, according to values derived by processing the values of analog detection signals from the sensor (1) or by processing the analog detection signals.

Abstract: An audio processing apparatus has converting means for converting n-channel (positive integral number: n?1) audio signals input from at least one sound source into two-channel signals, a pair of correcting filter means to which a pair of two-channel signals converted by the converting means are supplied and which corrects a difference of the sense of hearing due to a difference of headphone characteristics, and an output section for supplying a pair of output signals from the pair of correcting filter means to right and left speaker units of a headphone.

Abstract: An audio processing apparatus has a converter for converting n-channel (positive integral number: n?1) audio signals input from at least one sound source into two-channel signals, a pair of correcting filters to which a pair of two-channel signals converted by converter are supplied and which correct a difference of the sense of hearing due to a difference of headphone characteristics, and an output section for supplying a pair of output signals from the pair of correcting filters to right and left speaker units of a headphone.

Abstract: A transmitting/receiving device and a transmitting/receiving method for transmitting and receiving an acoustic signal through infrared radiation or the like are obtained wherein noise and interruption of the sound due to overmodulation of a transmitting device in compressing/expanding and transmitting the acoustic signal are not generated. In a transmitting/receiving device or a transmitting/receiving method having a receiving device for receiving a signal wireless-transmitted from a transmitting device, demodulating the signal to obtain an analog signal, and outputting the signal, wherein an analog acoustic signal input into the transmitting device is digitized, subjected to signal processing, analog-converted, and output. In the signal processing, the input digital signal is delayed and a level of the delay output signal is compressed or expanded according to a level of the input signal.

Abstract: A signal processor with a small circuit size, a simplified arrangement, and reduced cost and which can generate the same sound field as that in a case of listening to a reproduced sound using speakers to a location outside of a head of the listener has FIR filters and reverberation adding circuits. At an addition point provided to a tap midpoint of one FIR filter, a delay output signal of a tap end from another FIR filter is multiplied by a predetermined multiplication coefficient and then added. Output of one FIR filter is subjected to reverberation adding processing by the reverberation adding circuits and then output of yet another FIR filter is added to the above output to obtain an output signal. Therefore, even if the FIR filters with short tap lengths are used, long impulse response can be reproduced and a scale of signal processing can be reduced substantially.

Abstract: An object is to enable accurate calculation of angles and displacements, and to enable reduction of circuit scales. An audio signal processing device, having a digital signal processing circuit (31) which performs virtual acoustic image localization processing such that an acoustic image is localized at an arbitrary position in the vicinity of the listener, by reproducing, using headphones (2) or a plurality of speakers, output signals obtained by signal processing of input audio signals, is characterized in that analog detection signals from a sensor (1) which detects the state of action of the listener are input to the digital signal processing circuit (31) via an A/D converter (30), and the transmission characteristics of these audio signals are modified in realtime, according to values derived by processing the values of analog detection signals from the sensor (1), or by processing the analog detection signals.

Abstract: A metal hydroxide solid solution and a metal oxide solid solution, wherein the crystal form is an octahedron comprising upper and lower parallel basal planes and six peripheral pyramidal planes, the pyramidal planes consisting of upward-inclined planes and downward-inclined planes which are alternatively located. The ratio of the major axis diameter of the basal plane to the thickness between the upper and lower basal planes (major axis diameter/thickness) if 1 to 9. This improves fluidity, processability and the like when the solid solutions are kneaded into resins and the like.

Abstract: A signal processing circuit for performing predetermined signal processes to input audio signals of four channels, headphones to which an output signal of the signal processing circuit is supplied, and detecting method for detecting a rotation of the head of the listener are provided. Digital filters for convoluting impulse responses obtained by converting head portion transfer functions from sound sources to the right and left ears into time regions to the input audio signals of four channels, time-difference adding circuits, and level-difference adding circuits are provided in the signal processing circuit. In the adding circuits, a time difference and a level difference of the signals which are transmitted through the adding circuits are controlled in accordance with detection outputs of the detecting method.

Abstract: A production method of a magnesium hydroxide solid solution, Mg.sub.1-x M.sup.2+ .sub.x (OH).sub.2 or a resin and/or rubber material having as its effective elements containing said solid solution as its flame retardant, characterized by having M.sup.2+ distributed unevenly in a high concentration in the vicinity of the surface of each crystal, in the magnesium solid represented by the formula Mg.sub.1-x M.sup.2+ .sub.x (OH).sub.2 wherein M.sup.2+ is at least one divalent metal ion selected from the group consisting of Mn.sup.2+, Fe.sup.2+, Ni.sup.2+, Cu.sup.2+, Zn.sup.2+ and x indicates a range of 0.001.ltoreq.x<0.5.

Abstract: A composite metal hydroxide is produced by reacting magnesium-containing aqueous solution (X) including water soluble zinc compound wherein magnesium ion concentration is 0.01 to 1 mol/liter with alkaline material (Y) at a specific reaction equivalent ratio. Further, a composite metal hydroxide represented by the following general formula (1) is produced by hydrothermally treating thus obtained composite metal hydroxide within a temperature range of 100.degree. to 200.degree. C. for aging in chlorine-containing aqueous solution having a specific chlorine ion concentration:Mg.sub.1-x Zn.sub.x (OH).sub.2 (1)wherein x indicates a positive number within a range of 0.003.ltoreq.x.ltoreq.0.1. A uniform metallic solid solution can be obtained as a composite metal hydroxide by the above series of processes. Further, its crystal shape can be controlled thereby so as to restrain occurrence of secondary aggregation.

Abstract: A flame retardant polyolefin compound having low smoking and toxicity comprising 100 parts by weight of polyolefin resin, 100 to 150 parts by weight of a flame retardant, and 2 to 10 parts by weight of zinc stannate as a flame retardant auxilliary agent. The flame retardant polyolefin compound preferably uses a composite metal hydroxide as the flame retardant.

Abstract: A flame retardant polyolefin composition comprising polofin resin and a flame-retarding component which is prepared by adding 1 to 20 parts by weight of fine carbon powder to 100 parts by weight of composite metal hydroxide expressed by the general formula Mg.sub.1-x M.sup.+2.sub.x (OH).sub.2 in which M.sup.+2 is at least one element selected from the group consisting of bivalent metallic ions Mn.sup.+2, Fe.sup.+2, Co.sup.+2, Ni.sup.+2, Cu.sup.+2 and Zn.sup.+2, and x has a value satisfying 0.001.ltoreq.x.ltoreq.0.9.