Abstract: Audio signal processing apparatus is disclosed. The audio signal processing apparatus includes a first audio signal extracting section, a second audio signal extracting section, a sense-of-depth controlling section, a sense-of-sound-expansion controlling section, a control signal generating section, and a mixing section. The first audio signal extracting section extracts a main audio signal. The second audio signal extracting section extracts a sub audio signal. The sense-of-depth controlling section processes the extracted main audio signal to control a sense of depth. The sense-of-sound-expansion controlling section processes the extracted sub audio signal to vary a sense of sound expansion. The control signal generating section generates a first control signal with which the sense-of-depth controlling section is controlled and a second control signal with which the sense-of-sound-expansion controlling section is controlled.

Abstract: An electroacoustic transducer has an cup chamber and a diaphragm made of deformable electrostrictive polymer, which is attached to an opening of the chamber. The electroacoustic transducer also has first and second adaptive electrode layers formed on a front surface and a rear surface of the diaphragm, across which audio signal voltage biased by a direct-current biased voltage is applied. The first and second adaptive electrode layers have shapes that are adjustable according to a change in a shape of the diaphragm. The diaphragm is formed to make maximum a difference in air pressure of the front surface and the rear surface of the diaphragm, thereby forming any one of concave and convex shapes thereof.

Abstract: Audio signal processing apparatus is disclosed. The audio signal processing apparatus includes a first audio signal extracting section, a second audio signal extracting section, a sense-of-depth controlling section, a sense-of-sound-expansion controlling section, a control signal generating section, and a mixing section. The first audio signal extracting section extracts a main audio signal. The second audio signal extracting section extracts a sub audio signal. The sense-of-depth controlling section processes the extracted main audio signal to control a sense of depth. The sense-of-sound-expansion controlling section processes the extracted sub audio signal to vary a sense of sound expansion. The control signal generating section generates a first control signal with which the sense-of-depth controlling section is controlled and a second control signal with which the sense-of-sound-expansion controlling section is controlled.

Abstract: An electroacoustic transducer has an cup chamber and a diaphragm made of deformable electrostrictive polymer, which is attached to an opening of the chamber. The electroacoustic transducer also has first and second adaptive electrode layers formed on a front surface and a rear surface of the diaphragm, across which audio signal voltage biased by a direct-current biased voltage is applied. The first and second adaptive electrode layers have shapes that are adjustable according to a change in a shape of the diaphragm. The diaphragm is formed to make maximum a difference in air pressure of the front surface and the rear surface of the diaphragm, thereby forming any one of concave and convex shapes thereof.

Abstract: An electromagnetic induction type acoustic transducer apparatus including a magnetic gap formed between a plate and a pole piece serving as assemblies of a magnetic circuit, a conductive ring attached to a diaphragm, the diaphragm interposed within the magnetic gap for generating sounds when it is vibrated, and a flat coil disposed in the plate or the pole piece at the position opposing the magnetic gap and of which winding is increased from the vibration direction of the diaphragm to the direction perpendicular to the vibration direction of the diaphragm, wherein a width of the magnetic gap can be reduced.

Abstract: A speaker apparatus capable of reproducing from low-pitched to high-pitched sounds and a voice reproduction system employing the same. The speaker apparatus includes a speaker unit in which a primary coil is mounted in a gap portion between a plate and a center pole of a magnetic circuit, a secondary coil is disposed within the gap in such a manner as to be fixed to a vibration plate, and a secondary electric current is induced in the secondary coil by a signal current flowing through a primary coil, thereby operating the vibration plate; and a speaker driving circuit adapted to drive the primary coil of the speaker unit in accordance with a digital sound signal.

Abstract: An electromagnetic induction type acoustic transducer including a plate as an assembly of a magnetic circuit and having an opening of a predetermined diameter about a central axis, a pole piece as an assembly of the magnetic circuit and protruded on the central axis, having an outer peripheral diameter smaller than the opening of the plate and having an upper surface located lower than a lower surface of an opening peripheral portion of the plate by a predetermined distance, a lower surface portion of the opening peripheral portion of the plate and an upper surface portion of the pole piece constitute a magnetic gap of the magnetic circuit,a diaphragm vibrated in the upper and lower direction on the central axis at the position perpendicular to the central axis in the predetermined distance, an annular ring attached to the diaphragm at the position of the magnetic gap, and a coil attached to the plate and/or pole piece.

Abstract: A vibration sensor includes a substrate (7), a plate-like diaphragm (3) forming a capacitor, and holding assembly (2), (4), (6) for holding the diaphragm so as to be movable in parallel to the substrate. The diaphragm includes a plurality of flexible displacement portions (3c), (3d) for enabling the supporting portion of the diaphragm to be movable in parallel to the substrate. When vibrations are applied to the vibration sensor, the diaphragm portion of the diaphragm is vibrated and electrostatic capacity formed between the substrate and the diaphragm is changed based on the vibrations. Vibrations are detected on the basis of the change of electrostatic capacity. Since the vibration sensor includes the flexible displacement portions, the diaphragm becomes difficult to be vibrated due to a sound pressure and a vibration detected output can be prevented from being disturbed by the sound pressure.

Abstract: The present invention provides an optical disc recycling method for recycling optical disc including at least a light transmitting substrate and at least one metal layer containing a metal such as aluminium and gold provided on one side of the substrate. An adhesive member is adhered to the substrate side having the metal containing layer and the adhesive member adhered to the metal containing layer on the substrate is peeled off so as to separate the metal containing layer from the substrate.

Abstract: A speaker apparatus which drives an electromagnetic-coupling-type speaker in accordance with a digital signal is provided with a speaker unit, and a plurality of amplifiers corresponding to the number of quantization bits of a digital audio signal. The output terminals of the amplifiers are connected to the respective primary coils, respectively, and the output impedances of the plurality of the amplifiers are made equal to those of the respective primary coils to which the amplifiers are connected. Each bit of each sample of the digital audio signal is amplified by the plurality of the amplifiers and supplied to the respective primary coils, respectively.

Abstract: A speaker device driving drive coils of a speaker such as an electromagnetically coupled speaker by digital sound signals, where a primary coil of the speaker unit is constituted by 15 pieces of coils, the coils are made to correspond to respective bits excluding MSB of a digital sound of 16 bits issued from a serial/parallel converter, each of the coils are connected in a bridge connection to 4 pieces of FETs respectively opposed to each other and constant current sources are connected to the bridge connection portions whereby a coil drive circuit is constituted, currents from the constant current sources are respectively supplied to the coils and a variable resistor is adjusted by which voltages are changed and the currents of the constant current sources are commonly controlled whereby the volume of the speaker is finely driven.

Abstract: A vibration sensor includes a substrate (5), a plate-like diaphragm (3) forming a capacitor, and holding means (2), (4), (6) for holding the diaphragm so as to be movable in parallel to the substrate; The diaphragm includes a plurality of flexible displacement portions (3c), (3d) for enabling the supporting portion of the diaphragm to be movable in parallel to the substrate. When vibrations are applied to the vibration sensor, the diaphragm portion of the diaphragm is vibrated and electrostatic capacity formed between the substrate and the diaphragm is changed based on the vibrations. Vibrations are detected on the basis of the change of electrostatic capacity. Since the vibration sensor includes the flexible displacement portions, the diaphragm becomes difficult to be vibrated due to a sound pressure and a vibration detected output can be prevented from being disturbed by the sound pressure.

Abstract: A vibration sensor includes a substrate (5), a plate-like diaphragm (3) forming a capacitor, and holding means (2), (4), (6) for holding the diaphragm so as to be movable in parallel to the substrate. The diaphragm includes a plurality of flexible displacement portions (3c), (3d) for enabling the supporting portion of the diaphragm to be movable in parallel to the substrate. When vibrations are applied to the vibration sensor, the diaphragm portion of the diaphragm is vibrated and electrostatic capacity formed between the substrate and the diaphragm is changed based on the vibrations. Vibrations are detected on the basis of the change of electrostatic capacity. Since the vibration sensor includes the flexible displacement portions, the diaphragm becomes difficult to be vibrated due to a sound pressure and a vibration detected output can be prevented from being disturbed by the sound pressure.

Abstract: A loudspeaker includes a flat plate diaphragm mounted in a speaker frame and which is driven by a plurality of magnetic drivers each having a magnetic gap, a voice coil bobbin connected to the diaphragm at a respective node portion of the divided vibration mode and a voice coil in the respective magnetic gap and being wound around the voice coil bobbin therein. Rotational vibration of the diaphragm is prevented by a pole member which is connected from the center of the diaphragm to a damper supported behind the speaker frame on a damper supporting frame. The leverage due to the longer length of the pole member makes the damper member more effective in resisting rotational vibration. The damper supporting frame is mechanically connected to the speaker frame and/or magnetic drivers to add stiffness to the structure.

Abstract: A diaphragm for a loudspeaker includes first and second sheet members between which a core member is sandwiched and secured so that the core member has peripheral edge portions extending between the edges of the sheet members and at which the core member is of relatively low strength. A strip-like edging member, preferably of a thermosetting resin, is secured to the peripheral edge portions of the core member and to the edges of the sheet members for increasing the rigidity of the diaphragm at its periphery and preventing unwanted vibrations thereat. A damper member may be secured to the diaphragm adjacent the edging member for movably securing the diaphragm to a loudspeaker frame.

Abstract: A dynamic loudspeaker of the plane vibrating-plate, multi-point drive type has a support structure in the rear of the plane plate or diaphragm supporting the forward ends of a plurality of magnetic drivers to a frame. Connecting arms and diagonal connecting arms in the support structure stiffen the support structure to reduce vibration-induced flexure. The rear most ends of the magnetic drivers are also braced together and a transverse brace is connected between the structures at the forward and rear ends of the magnetic drivers.

Abstract: A loudspeaker having a diaphragm including first and second layers and a core sandwiched between the layers, the core being firmly secured to the inner surface of each layer so as to form a unitary structure therewith, a drive assembly causes the diaphragm to vibrate in accordance with a varying electrical input signal fed thereto, and a support is provided for supporting the diaphragm and drive assembly. The layers are formed of materials through which the velocity of propagation of a longitudinal wave is greater than 5000 m/sec, and the core is formed of materials having a shearing elastic modulus Gco which exceeds the value ##EQU1## WHERE E.sub.f is the longitudinal elasticity of each of the layers,t.sub.f is the thickness of each of the layers,t.sub.c is the thickness of the core, andl is the length across the surface of the diaphragm.