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True quality judging method and system for music

A quality judgment, real technology, applied in speech analysis, instruments, etc., can solve the problems of high labor and material resources, high quality of music files, huge amount of files in the music library system, etc., to avoid adverse effects.

Inactive Publication Date: 2014-10-15
GUANGZHOU KUGOU COMP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former is basically useless, because the encoding method is not the key to distinguishing sound quality, and music files with high bit rates are not necessarily of higher quality than music files with low bit rates; the latter detection scheme consumes a lot of manpower and material resources, and the music The amount of files in the library system is very large, tens of millions, this kind of solution is no longer applicable

Method used

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  • True quality judging method and system for music

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] figure 1 It is a schematic flow chart of Embodiment 1 of the present invention, such as figure 1 As shown, a method for judging the true quality of music comprises the following steps:

[0027] S100 preprocesses the current audio signal to obtain a preprocessed audio signal;

[0028] S200 divides the preprocessed audio signal into intervals at intervals of the set fixed frequency bands, and calculates the sum of the preprocessed audio signals in each interval to form a sum sequence;

[0029] S300 Search the sum value sequence according to the set threshold, if the difference between the sum value of the preprocessed audio signal in the current interval segment and the next interval segment is greater than the first threshold value, and the current interval segment and its subsequent interval segment The sum values ​​of the preprocessed audio signals in the interior are all less than the second threshold; then the cut-off frequency is calculated according to the curren...

Embodiment 2

[0042] Please refer to Figure 1 to Figure 2 , with reference to Embodiment 1, the process of preprocessing the current audio signal and obtaining the preprocessed audio signal in this embodiment includes the following steps:

[0043] S110 performs frame and window processing on the current audio signal to obtain a processed time-domain audio signal;

[0044] S120 Convert the time-domain audio signal into a frequency-domain audio signal, and perform absolute value processing on the frequency-domain audio signal to obtain a preprocessed audio signal.

[0045] Since the audio signal belongs to a short-term stationary process, it needs to be divided into frames. Each frame signal is regarded as a stationary process, and then windowed to obtain a time-domain audio signal. The window function can be selected according to actual needs. In this example The Hamming window can be selected, that is:

[0046] xw(n)=w(n)*x(n)

[0047] Wherein w(n) is a Hamming window whose length is N....

Embodiment 3

[0076] With reference to Embodiment 1 and Embodiment 2, in the present embodiment, firstly, the audio signal is subjected to frame-by-frame windowing processing to obtain the signal xw(n) after frame b is windowed, and the window function selects a Hamming window, and the length of xw(n) is N, where N is a power of 2.

[0077] Fast Fourier transform is performed on xw(n), and the absolute value is obtained to obtain the frequency domain signal XW(n), namely

[0078] XW(n)=abs(FFT(xw(n)))

[0079] Then follow as image 3 The steps shown obtain a preprocessed audio signal.

[0080] Such as image 3 As shown, the process of obtaining the preprocessed audio signal through the frequency domain audio signal processed by the absolute value includes the following steps:

[0081] S121 acquires the positive frequency frequency domain audio signal of the frequency domain audio signal after the absolute value processing;

[0082] S122 Perform variable substitution processing on the p...

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Abstract

The invention discloses a true quality judging method and system for music. The true quality judging method for the music includes steps of: pre-processing a current audio signal to obtain a pre-processed audio signal; dividing the pre-processed audio signal into several sections through using a set fixed frequency band as an interval, and calculating the sum of the pre-processed audio signals of the sections to form a sum sequence; obtaining a cut-off frequency according to the sum sequence and an audio sampling rate; judging the quality situation of the current music according to the cut-off frequency and a pre-stored mapping table. The true quality judging method and system for the music divide the true quality of the music through judging the cut-off frequency and combining with a coded format; the true quality judging method and system for the music can effectively discover the false high-quality music in a song book and avoid the baneful influence caused by the false high-quality music after hitting the shelves.

Description

【Technical field】 [0001] The invention relates to the technical field of music quality detection, in particular to a method and system for judging the true quality of music. 【Background technique】 [0002] With the improvement of living standards, users' pursuit of music quality is getting higher and higher, but at present, many of the high-quality music provided by record companies are fake high-quality, which is mainly manifested in re-encoding with low bit rate to generate high bit rate or Direct playback of re-recorded generated files. Therefore, it is necessary to detect the music quality in the music library. [0003] There are currently two high-quality music detection solutions. One is to detect whether the file format is standardized. For example, use the name of the encoding such as flac or mp3 to distinguish between high and low quality or use the code rate to distinguish between high and low quality. The other is manual detection. The former is basically useles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L25/60
Inventor 赵伟峰
Owner GUANGZHOU KUGOU COMP TECH CO LTD
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