Abstract: A sound volume operation device configured to amplify and output an inputted acoustic signal includes: at least one sound volume adjuster configured to adjustably amplify an inputted acoustic signal; an output level detector configured to detect an output sound volume level of the acoustic signal amplified by the at least one sound volume adjuster; and an illuminator provided at or adjacent to the at least one sound volume adjuster and configured to provide a different illumination state according to the output sound volume level detected by the output level detector.

Abstract: A headphone includes: a headband; a sound emitter having a sound-emitting unit therein; and a connector connecting the sound emitter to the headband. The connector includes: a support for supporting the sound emitter so that the sound emitter is rotatable in a predetermined rotation range including a reference position; a restoring portion for applying a restoring force on the sound emitter for urging the sound emitter to return to the reference position; and a switcher for switching a state in which the restoring force acts on the sound emitter and a state in which the restoring force does not act on the sound emitter.

Abstract: A music piece analyzer includes: a beat interval acquiring unit configured to acquire a beat interval in music piece data; a candidate detector configured to detect sounding positions where a change amount for sounding is equal to or more than a predetermined threshold in the music piece data, as candidates for sounding positions of a snare drum; and a sounding position determination unit configured to determine that the candidates for the sounding positions at a two-beat interval acquired by the beat interval acquiring unit in the music piece data are the sounding positions of the snare drum, among the candidates for the sounding positions of the snare drum.

Abstract: A music piece analyzer includes: a beat-position-acquiring-unit configured to detect beat positions in music piece data; a snare drum detector configured to detect sounding positions of a snare drum in the music piece data; a bass drum detector configured to detect sounding positions of a bass drum in, the music piece data; a one-beat-shift-determination-unit configured to determine whether a bar beginning of the music piece data is shifted by one beat based upon the sounding positions of the snare drum detected by the snare drum detector; a two-beat-shift-determination-unit configured to determine whether the bar beginning of the music piece data is shifted by two beats on a basis of the sounding positions of the bass drum detected by the bass drum detector; and a bar-beginning-setting-unit configured to set the bar beginning of the music piece data on a basis of results determined by the one-beat-shift-determination-unit and the two-beat-shift-determination-unit.

Abstract: A device includes: an information acquisition unit configured to obtain music piece information containing at least information on a beat position in music piece data; a lighting control unit configured to control a lighting fixture with reference to a change point of a lighting effect, whose minimum unit is defined by the beat position; and an operation interlock control unit configured to apply, in response to an operation performed on a music piece reproduction apparatus configured to reproduce the music piece data or a music piece reproduction controller configured to control the music piece reproduction apparatus, the lighting effect corresponding to the operation to the control of the lighting fixture.

Abstract: A lighting controller includes: an information acquiring unit configured to acquire music piece information including at least information on a beat position in music piece data; a lighting controller configured to control a lighting fixture with reference to a lighting-effect change point, a minimum unit of the lighting-effect change point being defined by the beat position; and an operation interlock control unit configured to apply, in response to a predetermined operation applied on a music piece reproduction apparatus configured to reproduce the music piece data as a music piece or a music piece reproduction controller configured to control the music piece reproduction apparatus, a predetermined lighting effect corresponding to the operation or a process executed by the operation to the control of the lighting fixture.

Abstract: A headphone includes: a headband; at least one sound-emitting unit including a sound emitter located therein; at least one connector connecting the sound-emitting unit to the headband such that the sound-emitting unit is rotatable around a rotation axis along an up-down direction, and at least one adjuster configured to adjust a rotation range of the sound-emitting unit.