Method and device for extracting main melody of music signals and terminal equipment

Abstract

The embodiment of the invention belongs to the technical field of signal processing and provides a method and device for extracting the main melody of music signals and terminal equipment. The methodcomprises the steps that: to-be-processed music signals are obtained, wherein the music signals comprise a plurality of frames of audio data; each frame of audio data is preprocessed, so that valid frames and invalid frames can be distinguished from each other; the invalid frames are identified as fundamental-frequency-free frames; for the valid frames, a frame frequency spectrum is calculated, and a main frequency is determined according to the frame frequency spectrum; a plurality of candidate fundamental frequencies of the valid frames are determined according to the main frequency of the valid frames and a preset harmonic energy cross-correlation algorithm; a fundamental frequency is identified from the plurality of candidate fundamental frequencies of the valid frames according to a preset rule; and based on the fundamental frequency of all the invalid frames, a fundamental frequency contour line matched with the music signals, i.e., the main melody of the music signals, is generated. With the method and device provided by the embodiments of the invention adopted, the main melody of the music signals can be accurately extracted in real time, and a calculated amount is small. The method can be used in various kinds of hardware containing microprocessors.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to a method, device and terminal equipment for extracting the main melody of a music signal. Background technique [0002] The rhythm of the music signal, accurately called the melody, refers to the main pitch at each moment in the audio data and the variation of each pitch at all times. Melody is related to human auditory perception and is the basic feature of audio data. There is no strict definition in the study of music signal science. The commonly used definition of melody refers to a set of ordered pitch sequences in music signals, but it needs separate from harmonics. It is generally understood that a melody is a sequence of fundamental frequencies of audio data. Specifically, for a pure musical instrument signal, the main melody refers to the situation in which the dominant fundamental frequency changes over time; when someone sings, that is, when a human voice a...

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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a method, device and terminal equipment for extracting the main melody of the music signal, so as to solve the problem that the process of extracting the main melody of the music signal in the prior art is very complicated and cannot be extracted in real time

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