TW201905903A - Audio control device and method thereof - Google Patents

Abstract

An audio control device and method thereof are provided. The audio control device includes a Raspberry Pi microcomputer and a sound card. The Raspberry Pi microcomputer installed an audio plug-in, an audio suite and an instruction layer script. The sound card is connected to the Raspberry Pi microcomputer and inputs a original audio signal. The Raspberry Pi microcomputer bases on the original audio signal to calculate the weighted average loudness value. The Raspberry Pi microcomputer bases on the weighted average loudness value and a limit peak to enhance an overall volume of an input audio signal to produce an enhanced audio signal. The Raspberry Pi microcomputer bases on the enhanced audio signal to produce a text file. The Raspberry Pi microcomputer bases on the text file and with the audio suite and the instruction layer script to suppress a noise of the enhanced audio signal. The sound card outputs the enhanced audio signal after suppressing a noise.

Description

Audio control device and method thereof

The present invention relates to a control device and method thereof, and more particularly to an audio control device and method therefor.

Loudness control is an indispensable part of audio processing. When the music or video with too loud volume dynamic range is played, it is often criticized that when the volume is loud, it often causes frightening; for example, the segment with small volume (such as movie dialogue) often needs to manually adjust the volume to hear clearly, but switch the action scene. When it was unable to adjust the original volume in time, it was suddenly scared by its sound.

In view of the above-mentioned problems, it is an object of the present invention to provide an audio control device for solving the problems faced by the prior art.

Based on the above object, the present invention provides an audio control device, which comprises a Raspberry Pi microcomputer and a sound card. The Raspberry Pi PC is equipped with audio plug-ins, sound effects kits, and command-level scripts. The sound card is connected to the Raspberry Pi microcomputer and the original audio signal is input. The Raspberry Pi microcomputer adjusts the input volume of the original audio signal through the sound plug-in to generate an input audio signal, and reads one of the plurality of input frames in the input audio signal. And a plurality of samples corresponding to the input frame generate a plurality of loudness values, calculate a weighted average loudness value according to the plurality of loudness values, and then generate a boosted audio signal according to the weighted average loudness value and the limit peak to increase the overall volume of the input audio signal, the tree The Raspberry Pi computer captures the noise signal of the audio signal, and then inputs the noise audio signal into the sound effect kit to generate the text file of the 1024-band noise suppression coefficient separated by the left and right channels. The Raspberry Pi microcomputer is based on the text file. And with the sound effect kit and the command layer script to improve the audio signal for advanced noise suppression, and then output by the sound card.

Preferably, the Raspberry Pi microcomputer can include a storage unit that is equipped with an operating system.

Based on the above object, the present invention further provides an audio control method, which is suitable for an audio control device. The audio control device includes a Raspberry Pi microcomputer and a sound card, and the Raspberry Pi microcomputer connects the sound card. The audio control method includes the following steps: installing an audio plug-in, Sound effects suite and command layer scripts. Enter the original audio signal. The input volume of the original audio signal is adjusted by the sound effects plug-in to generate an input audio signal. Read one of the input frames in the input audio signal. A plurality of samples corresponding to the input frame generate a plurality of loudness values. The weighted average loudness value is calculated from a plurality of loudness values. The boosted audio signal is generated by increasing the overall volume of the input audio signal based on the weighted average loudness value and the limit peak. Capture the noise audio signal that enhances the audio signal. The noise audio signal is input to the sound effect kit to generate a text file in which the left and right channels are separated and each has a noise suppression coefficient of 1024 bands. According to the text file and with the sound effect kit and the command layer script, the advanced audio suppression of the audio signal is performed and then output.

As described above, the audio control device of the present invention is coupled with a sound effect card through a Raspberry Pi microcomputer, supplemented by an appropriate system software configuration to achieve an effect of expanding the volume and suppressing audio noise.

The features, contents, and advantages of the present invention, as well as the advantages thereof, will be understood by the present invention. The present invention will be described in detail with reference to the accompanying drawings. The use of the present invention is not intended to be a limitation of the scope of the present invention, and the scope of the present invention is not limited by the scope and configuration of the accompanying drawings.

The advantages and features of the present invention, as well as the technical methods of the present invention, are described in more detail with reference to the exemplary embodiments and the accompanying drawings, and the present invention may be implemented in various forms and should not be construed as limited thereby. The embodiments of the present invention, and the embodiments of the present invention are intended to provide a more complete and complete and complete disclosure of the scope of the present invention, and The scope of the patent application is defined.

Please refer to FIG. 1 , which is a first block diagram of the audio control device of the present invention. As shown, the audio control device 100 of the present invention includes a Raspberry Pi microcomputer 110 and a sound card 120.

In other words, the Raspberry Pi microcomputer 110 mentioned above is equipped with an audio plug-in, a sound effect kit, and an instruction layer script.

The sound card 120 is connected to the raspberry pie microcomputer 110, and the original audio signal is input. The Raspberry Pi microcomputer 110 adjusts the input volume of the original audio signal through the sound plug-in to generate an input audio signal, and reads a plurality of input signals in the input audio signal. One of the frames, and a plurality of samples corresponding to the input frame generate a plurality of loudness values, calculate a weighted average loudness value according to the plurality of loudness values, and then increase the overall volume of the input audio signal according to the weighted average loudness value and the limit peak value. To enhance the audio signal, the Raspberry Pi microcomputer 110 captures the noise signal of the audio signal, and then inputs the noise audio signal into the sound effect kit to generate a text file with left and right channels separated and each containing 1024 frequency band noise suppression coefficients. The Raspberry Pi computer 110 performs advanced noise suppression on the boosted audio signal according to the text file and the sound effect kit and the command layer script, and then outputs the sound card 120.

Please refer to FIG. 2, which is a second block diagram of the audio control device of the present invention. As shown, the Raspberry Pi microcomputer 110 includes a storage unit 111 that is equipped with an operating system.

Further, the present invention aims to implement a portable amplifier (commonly referred to as an "Amp") device by using a Raspberry Pi microcomputer 110 with a sound card 120, supplemented by an appropriate system software configuration. With the built-in ALSA sound driver application, LADSPA plug-in and Bash flow control of the Raspberry Pi Microcomputer 110 operating system, and third-party suites such as SoX and bc processing, the effect of Loudness Equalization is achieved.

In more detail, the present invention uses a Raspberry Pi 3 (Raspberry Pi Microcomputer 110) in combination with a Cirrus Logic sound card (Audio Card 120). First install the sound card 120 to the motherboard GPIO slot of the Raspberry Pi microcomputer 110, and fill the Raspbian operating system to the SD card (the storage unit 111 of the Raspberry Pi microcomputer 110), and then adjust the ALSA configuration settings.

Then use the system's built-in LADSPA (Linux sound effect plug-in) sc4 component (sound plug-in), first adjust the input volume of the original audio signal, and then use fastLookaheadLimiter to increase the overall volume and limit the correlation peak, the implementation will be small Loud and loud dynamics maintain range control.

Then, the noise is captured and recorded as a .WAV audio file as the Noiserprof input source of the SoX (sound suite) to generate a text file with left and right channel separations, each containing 1024 frequency band noise suppression coefficients.

The text file is paired with SoX's Noisered effect, and the command layer script is used to implement basic noise suppression. Among them, the command layer script can be plural, as shown below (it is only an example, not limited to this): "init" script: #!/bin/bash /home/pi/bin/Reset_paths.sh /home /pi/bin/rpi-cirrus-functions.sh /home/pi/bin/Record_from_Linein.sh /home/pi/bin/Playback_to_Headset.sh sudo modprobe snd-aloop pcm_substreams=1 "leafpad" script: sudo leafpad | sudo pcmanfm "main" script: #!/bin/bash IFS=', ' read -r -a noise < "/home/pi/Desktop/target.noise" for ((;;)) do #sox -r 48000 -t Alsa hw:1,1 -r 48000 -t wav "/home/pi/Desktop/bar.wav" trim 0 0.00003 #sox -r 48000 -t alsa hw:1,1 -r 48000 -t wav "/home/ Pi/Desktop/bar.wav" trim 0 0.1908 sox -r 48000 -t alsa hw:1,1 -r 48000 -t wav "/home/pi/Desktop/bar.wav" trim 0 1.2 sox "/home/pi /Desktop/bar.wav" -n noiseprof "/home/pi/Desktop/tmp.noise" IFS=', ' read -r -a now < "/home/pi/Desktop/tmp.noise" diff0=$( Echo "(${noise[4]})-(${now[4]})"|bc) ratio0=$(echo "scale=6;$diff0 / (${noise[4]})"|bc ) diff1=$(echo "(${noise[7]})-(${now[7]})"|bc) ratio1=$(e Cho "scale=6;$diff1 / (${noise[7]})"|bc) diff2=$(echo "(${noise[10]})-(${now[10]})"|bc ) ratio2=$(echo "scale=6;$diff2 / (${noise[10]})"|bc) diff3=$(echo "(${noise[21]})-(${now[21] })"|bc) ratio3=$(echo "scale=6;$diff3 / (${noise[21]})"|bc) diff4=$(echo "(${noise[31]})-($ {now[31]})"|bc) ratio4=$(echo "scale=6;$diff4 / (${noise[31]})"|bc) diff5=$(echo "(${noise[90] })-(${now[90]})"|bc) ratio5=$(echo "scale=6;$diff5 / (${noise[90]})"|bc) diff6=$(echo "($ {noise[175]})-(${now[175]})"|bc) ratio6=$(echo "scale=6;$diff6 / (${noise[175]})"|bc) diff7=$ (echo "(${noise[415]})-(${now[415]})"|bc) ratio7=$(echo "scale=6;$diff7 / (${noise[415]})"| Bc) if [[ $(echo "$ratio0 < 0"|bc) -eq 1 ]]; then ratio0=$(echo "($ratio0) * (-1)"|bc) fi if [[ $(echo "$ratio1 < 0"|bc) -eq 1 ]]; then ratio1=$(echo "$ratio1 * (-1)"|bc) fi if [[ $(echo "$ratio2 < 0"|bc) - Eq 1 ]]; then ratio2=$(echo "$ratio2 * (-1)"|bc) fi if [[ $(echo "$ratio3 < 0"|bc) -eq 1 ]]; then ratio3=$( Echo "($ratio3) * (-1)"|bc) fi if [[ $(ech o "$ratio4 < 0"|bc) -eq 1 ]]; then ratio4=$(echo "$ratio4 * (-1)"|bc) fi if [[ $(echo "$ratio5 < 0"|bc) -eq 1 ]]; then ratio5=$(echo "$ratio5 * (-1)"|bc) fi if [[ $(echo "$ratio6 < 0"|bc) -eq 1 ]]; then ratio6=$ (echo "$ratio6 * (-1)"|bc) fi if [[ $(echo "$ratio7 < 0"|bc) -eq 1 ]]; then ratio7=$(echo "($ratio7) * (- 1)"|bc) fi if [[ $ratio0 == "" ]]; then continue fi if [[ $ratio1 == "" ]]; then continue fi if [[ $ratio2 == "" ]]; then Continue fi if [[ $ratio3 == "" ]]; then continue fi if [[ $ratio4 == "" ]]; then continue fi if [[ $ratio5 == "" ]]; then continue fi if [[ $(echo "$ratio5 == .102654"|bc) -eq 1 ]]; then continue fi if [[ $ratio6 == "" ]]; then continue fi if [[ $(echo "$ratio6 == . 161569"|bc) -eq 1 ]]; then continue fi if [[ $ratio7 == "" ]]; then continue fi comp0=$(echo "(($ratio0)>=1.2) && (($ratio0) <=3.4)"|bc) comp1=$(echo "(($ratio1)>=1.8) && (($ratio1)<=5.0)"|bc) comp2=$(echo "(($ratio2)>= 1.7) && (($ratio2)<=6.1)"|bc) comp3=$(echo "(($ratio3)> =2.1) && (($ratio3)<=6.8)"|bc) comp4=$(echo "(($ratio4)>=3.2) && (($ratio4)<=11.3)"|bc) comp5=$( Echo "(($ratio5)>=24) && (($ratio5)<=52)"|bc) comp6=$(echo "(($ratio6)>=12.5) && (($ratio6)<=25) "|bc) comp7=$(echo "(($ratio7)>=2.5) && (($ratio2)<=4.8)"|bc) # comp8=$(echo "(($ratio3)>=1.6) && (($ratio3)<=5.1)"|bc) # comp9=$(echo "(($ratio4)>=2.5) && (($ratio4)<=9.4)"|bc) # if [[ $comp2 - Eq 1 ]]; then # continue # fi if [[ $(echo "($comp0) && ($comp1) && ($comp2) && ($comp3) && ($comp4) && ($comp5) && ($comp6 ) && ($comp7)"|bc) -eq 1 ]]; then amixer -c 0 -- sset "HPOUT1 Digital" playback -120dB else vol=$(cat /home/pi/Desktop/volume.ctl) amixer - c 0 -- sset "HPOUT1 Digital" playback $vol ## echo "$ratio0" >> /home/pi/Desktop/ratio0.txt ## echo "$ratio1" >> /home/pi/Desktop/ratio1.txt ## echo "$ratio2" >> /home/pi/Desktop/ratio2.txt ## echo "$ratio3" >> /home/pi/Desktop/ratio3.txt ## echo "$ratio4" >> /home/ Pi/Desktop/ratio4.txt ## echo "$ratio5" >> /home/pi/Desktop/ratio5.txt ## echo "$ratio6" >> /home/pi/Desktop/ratio6.txt fi done "newprobe" script: #!/bin/bash # interval=22050Hz/1024 =21.533Hz, mono array starts from 2 to 1026. IFS=', ' read -r -a noise < "/home/pi/Desktop/target.noise" for ((;;)) do #sox -r 48000 - t alsa hw:1,1 -r 48000 -t wav "/home/pi/Desktop/bar.wav" trim 0 0.00003 #sox -r 48000 -t alsa hw:1,1 -r 48000 -t wav "/home /pi/Desktop/bar.wav" trim 0 0.1908 sox -r 48000 -t alsa hw:1,1 -r 48000 -t wav "/home/pi/Desktop/bar.wav" trim 0 0.3 sox "/home/ Pi/Desktop/bar.wav" -n noiseprof "/home/pi/Desktop/tmp.noise" IFS=', ' read -r -a now < "/home/pi/Desktop/tmp.noise" diff0=$ (echo "(${noise[415]})-(${now[415]})"|bc) ratio0=$(echo "scale=6;$diff0 / (${noise[415]})"| Bc) diff1=$(echo "(${noise[7]})-(${now[7]})"|bc) ratio1=$(echo "scale=6;$diff1 / (${noise[7 ]})"|bc) diff2=$(echo "(${noise[10]})-(${now[10]})"|bc) ratio2=$(echo "scale=6;$diff2 / ( ${noise[10]})"|bc) diff3=$(echo "(${noise[21]})-(${now[21]})" |bc) ratio3=$(echo "scale=6;$diff3 / (${noise[21]})"|bc) diff4=$(echo "(${noise[31]})-(${now[ 31]})"|bc) ratio4=$(echo "scale=6;$diff4 / (${noise[31]})"|bc) if [[ $(echo "$ratio0 < 0"|bc) - Eq 1 ]]; then ratio0=$(echo "($ratio0) * (-1)"|bc) fi if [[ $(echo "$ratio1 < 0"|bc) -eq 1 ]]; then ratio1= $(echo "$ratio1 * (-1)"|bc) fi if [[ $(echo "$ratio2 < 0"|bc) -eq 1 ]]; then ratio2=$(echo "$ratio2 * (-1 )"|bc) fi if [[ $(echo "$ratio3 < 0"|bc) -eq 1 ]]; then ratio3=$(echo "($ratio3) * (-1)"|bc) fi if [ [ $(echo "$ratio4 < 0"|bc) -eq 1 ]]; then ratio4=$(echo "$ratio4 * (-1)"|bc) fi echo "$ratio0" >> /home/pi/ Desktop/ratio7.txt # echo "$ratio1" >> /home/pi/Desktop/ratio6.txt # echo "$ratio2" >> /home/pi/Desktop/ratio2.txt # echo "$ratio3" >> / Home/pi/Desktop/ratio3.txt # echo "$ratio4" >> /home/pi/Desktop/ratio4.txt done "noiseprobe" script: #!/bin/bash # interval=22050Hz/1024=21.533Hz, mono Array starts from 2 to 1026. IFS=', ' read -r -a noise < "/home/pi/D Esktop/target.noise" for ((;;)) do #sox -r 48000 -t alsa hw:1,1 -r 48000 -t wav "/home/pi/Desktop/bar.wav" trim 0 0.00003 #sox -r 48000 -t alsa hw:1,1 -r 48000 -t wav "/home/pi/Desktop/bar.wav" trim 0 0.1908 sox -r 48000 -t alsa hw:1,1 -r 48000 -t wav "/home/pi/Desktop/bar.wav" trim 0 0.03 sox "/home/pi/Desktop/bar.wav" -n noiseprof "/home/pi/Desktop/tmp.noise" IFS=', ' read - r -a now < "/home/pi/Desktop/tmp.noise" diff0=$(echo "(${noise[4]})-(${now[4]})"|bc) ratio0=$( Echo "scale=6;$diff0 / (${noise[4]})"|bc) diff1=$(echo "(${noise[7]})-(${now[7]})"|bc ) ratio1=$(echo "scale=6;$diff1 / (${noise[7]})"|bc) diff2=$(echo "(${noise[10]})-(${now[10] })"|bc) ratio2=$(echo "scale=6;$diff2 / (${noise[10]})"|bc) diff3=$(echo "(${noise[21]})-($ {now[21]})"|bc) ratio3=$(echo "scale=6;$diff3 / (${noise[21]})"|bc) diff4=$(echo "(${noise[31] })-(${now[31]})"|bc) ratio4=$(echo "scale=6;$diff4 / (${noise[31]})"|bc) if [[ $(echo "$ Ratio0 < 0"|bc) -eq 1 ]]; then ratio0=$(echo "($ratio0) * (-1)"|bc) fi if [[ $(echo "$ratio1 < 0"|bc) -eq 1 ]]; then ratio1=$(echo "$ratio1 * (-1)"|bc) fi if [[ $(echo "$ratio2 < 0 "|bc) -eq 1 ]]; then ratio2=$(echo "$ratio2 * (-1)"|bc) fi if [[ $(echo "$ratio3 < 0"|bc) -eq 1 ]]; Then ratio3=$(echo "($ratio3) * (-1)"|bc) fi if [[ $(echo "$ratio4 < 0"|bc) -eq 1 ]]; then ratio4=$(echo "$ Ratio4 * (-1)"|bc) fi echo "$ratio0" >> /home/pi/Desktop/ratio5.txt #echo "$ratio1" >> /home/pi/Desktop/ratio1.txt #echo "$ Ratio2" >> /home/pi/Desktop/ratio2.txt #echo "$ratio3" >> /home/pi/Desktop/ratio3.txt #echo "$ratio4" >> /home/pi/Desktop/ratio4.txt Done "snd-aloop" script: #!/bin/bash for ((;;)) do #arecord -M -t wav -f S16_LE -B 0.01 -F 64 -r48000 -c2 -D hw:0 | sox - L -twav -r48000 -c2 - -L -twav -r48000 -c2 - noisered /home/pi/Desktop/mod.prof 0| aplay -B 0.01 -F 64 -M arecord -M -t wav -f S16_LE -B 0.01 -F 64 -r48000 -c2 -D hw:0 | aplay -B 0.01 -F 64 -M done "start" script: /home/pi/Desktop/init.sh sleep 10 ; /home/pi/Desktop/snd - Aloop.sh & sleep 15 ; /home/pi/Desktop/main.sh &

Further, in order to realize the instant play function, arecord, sox and aplay are connected in series using a simple pipeline instruction, and the noise suppression coefficient of the Loopback device is immediately returned through the additionally executed SoX, and then the operation is performed to perform advanced noise suppression. The volume is controlled by the amixer to instantly control the volume output to balance the loudness in real time.

In addition, if the mobile phone is connected to the USB jack of the Raspberry Pi microcomputer 110, and the line input of the sound card 120 is connected to play, the current noise can be obviously heard; the invention can adjust the gain degree of the noise source recording file, and is produced. Noiseprof's Noisered effect preserves most of the sound detail and eliminates the louder parts of the low-frequency noise that still appear after the phone stops playing music. The remaining less obvious but still audible noise is eliminated through the command layer script and the third-party bc math plugin.

Although the concept of the audio control method of the present invention has been described in the foregoing in the description of the audio control device of the present invention, for the sake of clarity, the flowchart will be described in detail below.

Please refer to FIG. 3, which is a flow chart of the audio control device of the present invention. As shown in the figure, the audio control method of the present invention is applicable to the above audio control device. The audio control device includes a Raspberry Pi microcomputer and a sound card, and the Raspberry Pi microcomputer connects the sound card. The audio control method includes the following steps:

In step S31: an audio plug-in, a sound effect kit, and an instruction layer script are installed.

In step S32: the original audio signal is input. The input volume of the original audio signal is adjusted by the sound effects plug-in to generate an input audio signal.

In step S33, one of the plurality of input frames in the input audio signal is read.

In step S34, a plurality of samples corresponding to the input frame generate a plurality of loudness values.

In step S35: the weighted average loudness value is calculated based on the plurality of loudness values.

In step S36, the boosted audio signal is generated according to the weighted average loudness value and the limit peak boosting the overall volume of the input audio signal.

In step S37, the noise audio signal for boosting the audio signal is captured.

In step S38, the noise audio signal is input to the sound effect kit to generate a text file in which the left and right channels are separated and each has a noise suppression coefficient of 1024 bands.

In step S39, according to the text file and the sound effect kit and the command layer script, the advanced audio signal is suppressed by the audio signal and then output.

The detailed description and embodiments of the audio control method of the present invention have been described above in connection with the audio control device of the present invention, and will not be described again for the sake of brevity.

As described above, the audio control device of the present invention is coupled with a sound effect card through a Raspberry Pi microcomputer, supplemented by an appropriate system software configuration to achieve an effect of expanding the volume and suppressing audio noise.

The embodiments described above are merely illustrative of the technical spirit and the features of the present invention, and the objects of the present invention can be understood by those skilled in the art, and the scope of the present invention cannot be limited thereto. That is, the equivalent variations or modifications made by the spirit of the present invention should still be included in the scope of the present invention.

100‧‧‧Optical control device

110‧‧‧Raspberry pie microcomputer

111‧‧‧ storage unit

120‧‧‧ sound card

Steps S31 to S39‧‧

Figure 1 is a first block diagram of the audio control device of the present invention. Figure 2 is a second block diagram of the audio control device of the present invention. Figure 3 is a flow chart of the audio control method of the present invention.

Claims (3)

An audio control device comprises: a raspberry pie microcomputer, which is provided with an audio plug-in, a sound effect kit and a command layer script; and a sound card, which is connected to the Raspberry Pi microcomputer and inputs an original audio signal, the tree The raspberry micro computer adjusts the input volume of one of the original audio signals by the sound effect plug-in to generate an input audio signal, and reads one of the plurality of input frames in the input audio signal, and corresponds to the plural of the input frame. The samples generate a plurality of loudness values, calculate a weighted average loudness value according to the plurality of loudness values, and then increase the overall volume of the input audio signal according to the weighted average loudness value and a limit peak to generate a boosted audio signal, the raspberry Sending a microcomputer to capture a noise audio signal of the boosted audio signal, and then inputting the noise audio signal into the sound effect kit to generate a text file in which the left and right channels are separated and each has a noise suppression coefficient of 1024 bands, the Raspberry Pi The microcomputer advances the elevated audio signal according to the text file and the sound effect kit and the instruction layer script. Inhibition information, and then outputted from the sound card. The audio control device of claim 1, wherein the raspberry pie microcomputer comprises a storage unit, and the operating system is installed. An audio control method is applicable to an audio control device, the audio control device includes a raspberry pie microcomputer and a sound card, and the Raspberry Pi microcomputer connects the sound card, and the audio control method comprises the following steps: installing an audio plug-in a sound effect kit and a command layer script; inputting an original audio signal; adjusting an input audio volume of the original audio signal by the sound effect plug-in to generate an input audio signal; and reading a plurality of input frames of the input audio signal One of the plurality of samples of the input frame generates a plurality of loudness values; calculating a weighted average loudness value according to the plurality of loudness values; and increasing the overall volume of the input audio signal according to the weighted average loudness value and a limit peak value Generating a boosting audio signal; capturing a noise audio signal of the boosted audio signal; inputting the noise audio signal to the sound effect kit to generate a text file of one of 1024 frequency noise suppression coefficients separated by left and right channels; According to the text file and the sound effect suite and the instruction layer script The audio signal is then output for advanced noise suppression.