What is the principle of music rhythm lamp?

The principle of light changing with the rhythm of music is to calculate the rhythm by detecting the frequency and period of the signal, and then judging the length of the tone.

The lighting controller is used to control the lighting rhythm of the luminaire according to the sound signal of the external environment.
The light controller includes a sound acquisition module, a processing module and a signal output module. Through the processing module, the sound signal collected by the sound acquisition module is identified for notes and beats, and then the control signal corresponding to this note and beat is sent to the lamp through the signal output module, so that the lamp can cooperate with the change of music melody or rhythm of the external environment. Let the flashing rate of the light echo the current music melody or rhythm, and achieve the beautiful effect of the unity of the music rhythm and the flashing rhythm of the light.

However, this method can only make the lights change according to the appearance and disappearance of the notes, and it is limited to the solos of single instruments.

The note length is because it may occupy a different length of time such as 1/4 beat, half beat, or 1 beat, and the beat of the note is not the same thing as the beat of the music, so the method of identifying the length of the note cannot synchronize the light with the rhythm of the music.

Moreover, when a variety of Musical Instruments, singing sounds, rhythm sounds exist at the same time, the frequency component of the note may be submerged and cannot be identified, and a variety of components with the same frequency as the note rather than from the note itself are mixed at the same time, resulting in the accurate identification of the note. Or when the music is played with no notes and only the sound of rhythmic instruments, it is even more difficult to recognize the rhythm.