Abstract: A pneumatic tire (1010) has a circumferential groove (1020) that extends in the tire circumferential direction (Tc), and a land part (1040) that is adjacent to the circumferential groove (1020) and extends in the tire circumferential direction (Tc). Formed in the circumferential groove (1020) is an inner groove (1110) on the bottom (1020b) of the circumferential groove (1020) and recessed more in the tire radial inward direction than the bottom (1020b). The inner groove (1110) includes an inclined part (1120) that extends so as to be inclined in the tire circumferential direction (Tc). The land part (1040) has a hook-like groove portion (1210) formed along the direction (A11) in which the inclined part (1120) extends. The extension direction ends (1210a, 1210b) of the hook-like groove portion (1210) end within the land part.

Abstract: A hearing optimization device and hearing optimization method having a high boost frequency characteristic reference live for high frequency range enhancement and a low boost frequency characteristic reference live for low frequency range enhancement to achieve separate gain control of input audio signal according to frequency. An audio signal processing and generating means is also included, along with synthesized audio signal output structure.

Abstract: A tyre wherein a first bulge part and a second bulge part are formed in a circumferential direction groove. The first bulge part has a narrow-tip shape such that, in the tyre tread plan view, the size in the tread width direction diminishes along a first direction in the tyre circumferential direction. The second bulge part has a narrow-tip shape such that, in the tyre tread plan view, the size in the tread width direction diminishes along a second direction opposite to the first direction in the tyre circumferential direction. A plurality of first bulge parts and second bulge parts are provided at predetermined intervals in the tyre circumferential direction. A groove part which extends in the tyre circumferential direction is provided between the first bulge part and the second bulge part which opposes the first bulge part in the tread width direction.