CN110033796B

CN110033796B - Old record recording noise filtering method

Info

Publication number: CN110033796B
Application number: CN201910256693.3A
Authority: CN
Inventors: 熊志远; 乔小兵; 刘京龙; 王文倩; 郭小涛
Original assignee: Huayun Culture Technology Co ltd
Current assignee: Huayun Culture Technology Co ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2021-05-11
Anticipated expiration: 2039-03-29
Also published as: CN110033796A

Abstract

The invention discloses a method for filtering the recording noise of an old record, which realizes mutual cancellation of the noise by overlapping the audio frequency sound of the old record. One of the old record audio frequency superposition modes is to simultaneously play a plurality of old record audio frequencies, simultaneously collect each old record audio frequency, and perform weighted average on the collected audio file signals to obtain a final audio file. The other method of the superposition of the audio frequency of the old record is to record the audio frequency of the old record played each time by repeatedly playing the same old record for multiple times, and carry out weighted average on all the recorded audio frequencies of the old record to obtain a final audio file. The problem that the audio frequency recorded by the vibration of the disc player of the existing disc record contains noise is solved.

Description

Old record recording noise filtering method

Technical Field

The invention relates to an audio processing method of a vinyl record, in particular to a method for filtering recording noise of an old record.

Background

In the field of music, vinyl records produced in the last century are largely applied to recording, storing and playing of music with high fidelity and high cost performance, a plurality of classical music is recorded and stored, along with the development of times, particularly the upgrading and updating of electronic technology, mainstream music recording carriers are changed, the development of electronic technology enables music transmission and recording to obtain better carriers, old vinyl records are still used for recording and appreciating music among professional musicians and nostalgic people, meanwhile, a plurality of classical vinyl records need to be recorded and converted into current music transmission carriers to be obtained by more people, and are used for playing vinyl records directly at a long time, the wear of the vinyl records is large, and the music recording cannot be completed.

Therefore, it is necessary to record the old record to save the old record, but in the recording process, the recorded audio contains noise due to the vibration of the record player, so that the tone quality of the record is greatly impaired, and a recording method is required to be designed to eliminate the noise in the recording process.

Disclosure of Invention

The invention aims to provide a method for filtering the recording noise of an old record, which is used for solving the problem that the audio recorded by the vibration of the record player of the existing record contains noise.

In order to achieve the purpose, the invention adopts the following technical scheme:

a filtering method for the noise generated by recording old record features that the audio sounds of old record are overlapped to cancel out the noise.

One of the above-mentioned superposition modes of the old record audio is to acquire each old record audio simultaneously by playing a plurality of old record audio simultaneously, and to perform weighted average on the acquired audio file signals to obtain a final audio file.

Preferably, the recording device for collecting the audio of the old record includes a microphone, a signal processing circuit and a comprehensive processing module, the microphone is used for converting a sound signal into an electric signal, the converted electric signal is input into the signal processing circuit, the signal processing circuit converts the input electric signal into a digital signal and outputs the digital signal to the comprehensive processing module, the comprehensive processing module receives the digital signal of the multiple signal processing circuits for weighted average, and then the final audio file is uploaded to an upper computer.

Preferably, the signal processing circuit is a circuit module having NSA2860 as a core chip; the comprehensive processing module is a circuit module taking the STM32F407 as a core chip and comprises an SPI communication protocol interface module, a memory module and a display module; during operation, digital information of the signal processing circuit is received through the SPI communication protocol interface module, the acquired digital information is stored in the memory module, the USB module is used for communicating with an upper computer, and the comprehensive processing module transmits signals obtained after weighted averaging of the multiple paths of digital signals to the upper computer through the USB module.

The other mode of the superposition of the audio frequency of the old record is to record the audio frequency of the old record played each time by repeatedly playing the same old record for multiple times, and carry out weighted average on all the recorded audio frequencies of the old record to obtain a final audio file.

Preferably, the recording device for collecting the audio of the old record comprises a microphone, a signal processing circuit and a comprehensive processing module, wherein the microphone is used for converting a sound signal into an electric signal, the converted electric signal is input into the signal processing circuit, the signal processing circuit converts the input electric signal into a digital signal and outputs the digital signal to the comprehensive processing module, the old record audio is played for multiple times, the comprehensive processing module sequentially receives the digital signal of the signal processing circuit, the digital signal received for multiple times is weighted and averaged, and then a final audio file is uploaded to an upper computer.

Preferably, the signal processing circuit is a circuit module having NSA2860 as a core chip; the comprehensive processing module is a circuit module taking the STM32F407 as a core chip and comprises an SPI communication protocol interface module, a memory module and a display module; during operation, digital information of the signal processing circuit is received through the SPI communication protocol interface module, the acquired digital information is stored in the memory module, the USB module is used for communicating with an upper computer, and the comprehensive processing module transmits signals obtained after digital signals received for many times are weighted and averaged to the upper computer through the USB module.

The invention has the following advantages:

after the design of the invention is adopted, the noise filtering of the old record is realized by repeatedly recording for many times, utilizing the orderless of noise and utilizing the weighted average method, so that the recording of the old record obtains better effect.

Drawings

Fig. 1 is a block diagram of a system for filtering recording noise of an old record according to a first embodiment of the present invention.

Fig. 2 is a block diagram of a system of an integrated processing module according to a first embodiment of the method for filtering noise generated during recording of an old record.

Fig. 3 is a block diagram of the system components of a second embodiment of the method for filtering noise generated by recording a legacy record.

Fig. 4 is a block diagram of the system of the integrated processing module according to the second embodiment of the method for filtering noise generated by recording a legacy record.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship may be made without substantial changes in the technical contents.

Example 1

Referring to fig. 1-2, a method for filtering recording noise of an old record includes that audio sounds of the old record are superimposed to cancel each other out.

In the specific implementation, 6 record machines are used for recording at the same time.

Example 2

Referring to fig. 3-4, another way of superimposing the audio of the old record is to repeat playing the same old record multiple times, record the audio of the old record played each time, and perform weighted average on all the recorded audio of the old record to obtain the final audio file.

In specific implementation, a single CD player repeatedly plays for 6 times.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A method for filtering the recording noise of old record is characterized in that: the filtering method is characterized in that the noise cancellation is realized by superposing the audio sounds of old records, the superposition mode of the audio sounds of the old records is realized by simultaneously playing a plurality of audio sounds of the old records, each audio sound of the old records is simultaneously collected, the collected audio file signals are weighted and averaged to obtain a final audio file, the recording equipment for collecting the audio sounds of the old records comprises a microphone, a signal processing circuit and a comprehensive processing module, the microphone is used for converting the sound signals into electric signals, the converted electric signals are input into the signal processing circuit, the input electric signals are converted into digital signals by the signal processing circuit and output to the comprehensive processing module, the comprehensive processing module receives the digital signals of the multi-path signal processing circuit to be weighted and averaged, and the final audio file is uploaded to an upper computer.

2. The method for filtering noise generated by recording old record as claimed in claim 1, wherein: the signal processing circuit is a circuit module with NSA2860 as a core chip; the comprehensive processing module is a circuit module taking the STM32F407 as a core chip and comprises an SPI communication protocol interface module, a memory module and a display module; during operation, digital information of the signal processing circuit is received through the SPI communication protocol interface module, the acquired digital information is stored in the memory module, the USB module is used for communicating with an upper computer, and the comprehensive processing module transmits signals obtained after weighted averaging of the multiple paths of digital signals to the upper computer through the USB module.

3. The method for filtering noise generated by recording old record as claimed in claim 1, wherein: the superposition mode of the old record audio records the old record audio played each time by repeatedly playing the same old record for multiple times, and performs weighted average on all the recorded old record audio to obtain a final audio file.

4. A method for filtering noise generated by recording a legacy record according to claim 3, wherein: gather record equipment of old record audio frequency including microphone, signal processing circuit and comprehensive processing module, the microphone is used for turning into the signal of telecommunication with sound signal, the signal input signal processing circuit after the conversion, signal processing circuit turns into digital signal with the signal of input, output gives comprehensive processing module, the old record audio frequency of repetitious playback, comprehensive processing module receives signal processing circuit's digital signal in proper order, carry out the weighted average to the digital signal of receiving many times, then upload final audio file for the host computer.

5. The method for filtering noise generated by recording old record as claimed in claim 4, wherein: the signal processing circuit is a circuit module with NSA2860 as a core chip; the comprehensive processing module is a circuit module taking the STM32F407 as a core chip and comprises an SPI communication protocol interface module, a memory module and a display module; during operation, digital information of the signal processing circuit is received through the SPI communication protocol interface module, the acquired digital information is stored in the memory module, the USB module is used for communicating with an upper computer, and the comprehensive processing module transmits signals obtained after digital signals received for many times are weighted and averaged to the upper computer through the USB module.