Abstract: A music signal processing apparatus includes a frequency spectrum transform unit, a filter, a frequency feature amount generation unit, and a melody feature amount sequence acquisition unit. The frequency spectrum transform unit is configured to transform a music signal into a frequency spectrum, the music signal being a signal of a musical piece containing a part with a melody. The filter is configured to remove a steep peak of the frequency spectrum. The frequency feature amount generation unit is configured to generate, from a signal output from the filter, a frequency feature amount in which a fundamental frequency component of the part is emphasized. The melody feature amount sequence acquisition unit is configured to acquire, based on the frequency feature amount, a melody feature amount sequence that specifies a fundamental frequency of the part at each time.

Abstract: To preferably identify a piece of music corresponding to an input sound signal. Continuous input sound signals are converted into a predetermined characteristic amount sequence. A checking process of the characteristic amount sequence against music information is sequentially executed when a predetermined quantity of the characteristic amount sequence is accumulated and a piece of music having a matching degree greater than a threshold value is conclusively identified. In this case, since the conversion of the continuous input sound signals into a predetermined characteristic amount sequence and the execution of the checking process of the characteristic amount sequence against music information are executed in parallel, a music identification having a great real-time ability can be performed.

Abstract: A content reproduction device including: a microphone that collects noise in the surroundings of a casing; a feature amount extractor that extracts a plurality of feature amounts; a distance calculator that calculates an intervector distance between the extracted feature amount vector and a feature amount vector with the same dimensions which is set in advance as a feature amount of a waveform of a music signal; a determinator that determines whether or not music is included in the sounds collected by the microphone; a processor that processes the signal of the sounds collected by the microphone to change the volume or frequency characteristics of the sounds collected by the microphone; and an adder that adds and outputs the signal of the sounds collected by the microphone and the signal of sounds of reproduced content.

Abstract: A content reproduction device including: a microphone that collects noise in the surroundings of a casing; a feature amount extractor that extracts a plurality of feature amounts; a distance calculator that calculates an intervector distance between the extracted feature amount vector and a feature amount vector with the same dimensions which is set in advance as a feature amount of a waveform of a music signal; a determinator that determines whether or not music is included in the sounds collected by the microphone; a processor that processes the signal of the sounds collected by the microphone to change the volume or frequency characteristics of the sounds collected by the microphone; and an adder that adds and outputs the signal of the sounds collected by the microphone and the signal of sounds of reproduced content.