wavrecord() replacement and sound speed measurement

Question

Michal Rocinski 2020-4-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/521037-wavrecord-replacement-and-sound-speed-measurement

评论： Walter Roberson 2023-9-21

I would like to try to measure sound speed with Matlab. I have two microphones recording sound at the same time. They are both connected to my laptop through stereo input. I have tried to use code from this topic: https://www.mathworks.com/matlabcentral/answers/129171-sound-speed-measurement-with-two-microphones

I replaced 'wavrecord()' to an audiorecorder function but it gives an error. I have no idea what I can change to make the program work properly and start recording a sound.

Here is the code and the error below:

if true
clear; figure; grid on; hold on; 
Fs = 22050;
r = audiorecorder(22050,16,2);
record(r,5);
mySpeech = getaudiodata(r, 'int16');
tmax = length(mySpeech)/Fs; 
t = linspace(0, tmax, 5*Fs); 
plot(t*1000,mySpeech); 
axis([0 tmax*1000 -2 2]); 
xlabel('time (ms)'); 
j = 1; 
for i=1:length(mySpeech) 
    if mySpeech(i)>0.15 
        pick(j) = 1000*i/Fs; 
        fprintf('%3d --> %8.1f ms\n',j, pick(j)); 
        j=j+1; 
    end 
end
end

Error using audiorecorder/getaudiodata (line 765)

Recorder is empty.

Error in program (line 7)

mySpeech = getaudiodata(r, 'int16');

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Answer 1

Walter Roberson 2020-4-27

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/521037-wavrecord-replacement-and-sound-speed-measurement#answer_428639

在 MATLAB Online 中打开

Change

record(r,5);

to

recordblocking(r,5);

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Answer 2

Dian 2023-9-21

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/521037-wavrecord-replacement-and-sound-speed-measurement#answer_1314937

编辑：Walter Roberson 2023-9-21

在 MATLAB Online 中打开

clear all; 
 Fs = 8000; 
 y = wavrecord(5.0*Fs, Fs, 'double'); 
 wavwrite(y,Fs,'aiueo.wav')
y1=wavread('aiueo.wav'); 
t=length(y1); 
y2=y1(1:10000); 
plot(y2) 

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Walter Roberson 2023-9-21

@Dian

Unfortunately, that will not solve @Michal Rocinski's problem, which was happening in R2019b. By R2019b, wavrecord() had been completely removed from MATLAB; wavwrite() had also been removed https://www.mathworks.com/matlabcentral/answers/647743-is-wavwrite-still-used#answer_544418 and probably wavread() had been removed too.

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