Abstract: A flight speaker 1 firstly outputs an inspection sound while flying on a first route R1 in a linear shape connecting a position of a sound collecting microphone M disposed inside a concert hall P1, and identifies an optimal volume position where a volume of a received sound collected by the sound collecting microphone M becomes an expected volume. The flight speaker 1 outputs an inspection sound while flying on a second route R2 in an arc shape with a distance between the identified optimal volume position and a position of the sound collecting microphone M as a diameter, and identifies an output position where a sound waveform of the received sound from the sound collecting microphone M becomes an expected sound waveform.

Abstract: An electronic musical instrument includes: a plurality of keys; a detection part, detecting, by a plurality of detectors provided for each of the keys, a state of depression or release of the key; a musical tone controller, controlling a musical tone according to the state of the key detected by the detection part; a scanning part, sequentially executing detection of the state of the key by the detection part for each of the keys; an operation key acquisition part, acquiring the key that is in the middle of being depressed or being released based on a detection result obtained by the detection part; and a priority part, giving priority to the detection of the state of the key acquired by the operation key acquisition part by the detection part in the scanning part.

Abstract: A video processing device, which inputs a piece of music and selects and outputs one video of a plurality of video sources, is provided. The video processing device includes a music analyzing part, which analyzes a progress of the piece of music; a video selecting part, which selects the one video from the plurality of video sources; and an output part, which outputs the one video at a timing corresponding to the progress of the piece of music that has been analyzed by the music analyzing part.

Abstract: An information processing device, a tempo detection device and a video processing system are provided. A beat of a piece of performed music is detected from a musical viewpoint. The information processing device includes: an acquisition part that acquires samples of musical sound signals in a time series; an evaluation part that has an adaptive filter using the acquired samples of the musical sound signals as reference signals and using samples of musical sound signals acquired a predetermined time earlier than the samples of the musical sound signals as input signals; and a tempo determination part that sequentially inputs the samples of the musical sound signals to the adaptive filter and determines a tempo corresponding to a musical sound based on a filter coefficient when a value of the filter coefficient of the adaptive filter converges.

Abstract: An information processing device, a tempo detection device and a video processing system are provided. A beat of a piece of performed music is detected from a musical viewpoint. The information processing device includes: an acquisition part that acquires samples of musical sound signals in a time series; an evaluation part that has an adaptive filter using the acquired samples of the musical sound signals as reference signals and using samples of musical sound signals acquired a predetermined time earlier than the samples of the musical sound signals as input signals; and a tempo determination part that sequentially inputs the samples of the musical sound signals to the adaptive filter and determines a tempo corresponding to a musical sound based on a filter coefficient when a value of the filter coefficient of the adaptive filter converges.