Separation method of sp/lp turntable music signal and scratch noise

Abstract

The invention relates to an SP (StandarlPlay) turntable music signal and scratching noise separating method. According to the method, an LP player plays an LP turntable at a speed of 156r / min; audio signals are transmitted to an open reel audio tape sound recorder through a balance interface signal wire; the open reel audio tape sound recorder adopts a twice sound recording speed for recording; the open reel audio tape sound recorder adopts the original speed for playing recorded tape audio signals; and the audio signals are transmitted into a hardware master tape processor through a frequency equalizer. The SP / LP turntable music signal and scratching noise separating method is characterized in that the turntable rotating speed is doubled for playing; then, the open reel audio tape sound recorder adopts the doubled recording speed for recording; the open reel audio tape sound recorder adopts the original speed for playing the recorded tape audio signals; the turntable rotating speed is doubled, and the music signal frequency is doubled; and the scratching noise frequency is improved by 4 times. After the method is adopted, the music signals can be effectively separated from the scratching noise, and the tone quality of the original LP turntable can be enabled not to be interfered by the scratching noise.

Description

technical field [0001] The invention relates to an audio processing method, in particular to a method for separating music signals from SP / LP discs and scratch noises. Background technique [0002] There are still a large number of SP / LP (SP is 78 rpm turntable Standard-Playing referred to as SP; LP is 33 and 1 / 3 turn / min turntable (LongPlay referred to as LP). Over time, these music publications Gradually reveal its precious cultural relic value. [0003] After the digital age, libraries, archives, museums, and teaching institutions in various countries are trying to digitize and use the precious content in SP / LP for a long time. However, most of the remaining SP / LP have scratches and traces of use due to improper use and protection (hereinafter referred to as scratch noise). Not much, but it has a big impact on the replay effect. How to minimize the scratching noise during the whole process of SP / LP digitization, so as to minimize the impact on the replay effect of the ...

AI Technical Summary

Problems solved by technology

At present, in the processing link at the back of the whole digitalization process, the technology of using software to process scratch noise has become increasingly mature, but the effect is still not satisfactory, especially there is still a large gap with the market demand. The main problems are as follows: A large part of the scratch noise is reproduced at the same frequency as the music signal, so that the software cannot distinguish between the music signal and the scratch noise

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