Onkyo Corporation

Takamine Gakki Co., Ltd.

Sadatoshi Hisamoto

Yushi Ono

Takeru Inoue

Norio Umezu

Kazutaka Murayama

Koichi Sadaie

Shuichi Hiza

Joji Kasai

Hiroyasu Kumo

Kazumasa Takemura

Tetsuro Nakatake

Hajime Yoshimura

Atsushi Minakawa

Koji Takatori

Yoshitaka Handa

Kosuke Heki

Tetsuya Toyama

Hiroyuki Mizutani

There is provided a diaphragm or a dust cap configured to emit a sound wave and an electrodynamic speaker unit including the diaphragm or the dust cap. The speaker unit is configured so that a great peak dip of sound pressure frequency characteristics due to influence of a divided vibration mode can be prevented and excellent reproduced sound quality can be provided. In the diaphragm or the dust cap, a recessed-raised portion imitating a wing of an insect is formed at least on one surface of a diaphragm portion configured to emit a sound wave. Preferably, the recessed-raised portion is formed based on data obtained by measurement of an actual shape of a wing vein of the insect or data of a Voronoi diagram imitating the wing vein of the insect.

Diaphragm or dust cap and speaker unit

A controlling unit includes: a memory unit that stores information in which the multiple clock frequencies that satisfy conditions for predetermined reception interferences to a part of multiple carrier frequencies included in a band frequency of the broadcast wave are previously set so that not all clock frequencies satisfy the conditions for the reception interferences to the same carrier frequencies, the information indicating a relation between each clock frequency and the carrier frequency that includes the reception interference; a reception frequency setting unit that sets the carrier frequency to be received to the broadcast wave receiving unit; a clock frequency determining unit that refers to the information stored in the memory unit and determines a clock frequency that does not include a reception interference to the carrier frequency that is set by the reception frequency setting unit, the determined clock frequency being out of the multiple clock frequencies; and a clock frequency setting unit that sets the clock frequency determined by the clock frequency determining unit to the reference clock generating unit, so that the reference clock generating unit generates a reference clock having the determined clock frequency.

Broadcast wave receiving system

A speaker cabinet according to an embodiment of the present invention includes: a pair of side plates whose outer peripheral portions define no apexes; and a bent plate curved in conformity with the outer peripheral portions of the pair of side plates and mounted to the pair of side plates.

Speaker cabinet and speaker using the same

A speaker diaphragmincludes a first diaphragm portion, a second diaphragm portionintegrally molded with the first diaphragm portion, and a bobbin-receiving portionprotruding from a back side of a connecting portion between the first diaphragm portionand the second diaphragm portion, with one end of a voice coil bobbinbeing bonded to the bobbin-receiving portion. The bobbin-receiving portionincludes a first extensionextending backwards from the first diaphragm portionand a second extensionextending backwards from the second diaphragm portion. A bobbin-receiving grooveis defined between the first extensionand the second extension. The voice coil bobbinis inserted in and bonded to the bobbin-receiving groove

Speaker diaphragm and speaker using the same

A pulse-width modulation circuit converts an input signal into a pulse signal to be supplied to a switch amplifying circuit. The modulation circuit includes a comparison signal generator, an amplitude controller for modulating a comparison signal from the signal generator, and a comparator for comparing the modulated comparison signal and the input signal. The comparator outputs a signal whose level is inverted in accordance with the level of the input signal. The signal outputted from the comparator is supplied to the switch amplifying circuit.

Pulse-width modulation circuit and switching amplifier using the same

A heatsink arrangement attached to a semiconductor device includes: a first heatsink placed in close contact with the semiconductor device; and second heatsink placed in close contact with the first heatsink, wherein the first heatsink and the second heatsink are connected to a power supply circuit for the semiconductor device via first connector and second connector, respectively. Thus, the present invention provides a heatsink arrangement for a semiconductor device used in an electric/electronic circuit that radiates less high-frequency noise even when a large current flows through the semiconductor device and that provides a high heat-radiating efficiency.

Heatsink arrangement for semiconductor device

Surround-effect, providing no unnatural feeling to the listeners who sit next to each other under side-by-side basis through virtual sound sources, is realized. A surround left channel signal SL and a surround right channel signal SR are mixed with an adderand are in monaural. A first monophonic signal and a second monophonic signal thus resulted are supplied to a virtual localization processor. A first virtual localization output of the processoris supplied to a front left speaker SPL and a front right speaker SPR and a second virtual localization output thereof is supplied to a front center speaker SPC. In this way, virtual sound sources can be created at the right and the left to the listener. Similarly, virtual sound sources can also be created at the right and the left to the listener. Sound fields from the virtual surround sources are in reverse to the listenerand the listener. However, no substantial drawbacks caused by the reversal are observed because monophonic signals are reproduced as the surround signals in this embodiment. In this way, surround-effect with natural feeling can be achieved.

Surround-sound processing system

A pulse width modulation circuit of the present invention includes: pulse generation means being provided with a first power supply and charged with a first current and a second current between which a constant current is distributed to turn ON/OFF a switching element, thereby generating a pulse from a first output section; pulse modulation means for controlling the charging while controlling a distribution ratio between the first current and the second current based on an input signal, thereby changing a pulse width of the output pulse; and first short circuit means for shorting the first output section with the first power supply when the pulse being output from the first output section transitions to a voltage of the first power supply.

Growing community of inventors

Neyagawa, Japan

Sadatoshi Hisamoto