How to resolve "Invalid sample rate" error when using audioPlayerRecorder

I want to play & record synchronously but this code fails.

Perhaps the error is caused because a driver is not installed or Windows device parameters are not set appropriately.

Forgive the longish progam; I'm not sure how much context is needed for a specific diagnosis.

% PR_trouble.m   Matlab 2019b(9.9.0.1467703)   3.6GHz i9 Dell Win10 PC
clear; close all force; clc;

% Make & verify a wav file
file_name = 'soundfile.wav';
fullfile_name  = fullfile ( pwd, file_name );
fs = 44100;
tone = sin ( 2 * pi * 1000 * (1:51200)/fs );
audiowrite ( fullfile_name, tone, fs );
wav_file_info = audioinfo ( fullfile_name )

% Make AudioFileReader, AudioFileWriter & audioPlayerRecorder
my_Reader = dsp.AudioFileReader ...
    ( fullfile_name, 'SamplesPerFrame',512 );
fs = my_Reader.SampleRate

my_Writer = dsp.AudioFileWriter ...
    ( fullfile(pwd,'output.wav'), 'SampleRate',fs )

available_playRecs = audioPlayerRecorder
my_aPR = audioPlayerRecorder ( 'SampleRate', fs );
devices = getAudioDevices ( my_aPR )

% Play & record
while ~ isDone ( my_Reader )
    audioToPlay = my_Reader ();
    audioRecorded = my_aPR ( audioToPlay );  %%% ERROR HAPPENS HERE -- FIRST EXECUTION
    my_Writer ( audioRecorded );
end

wav_file_info =

struct with fields:

Filename: 'C:\Users\psycuser\Desktop\MatlabPrograms\native_egg_sound\soundfile.wav'

CompressionMethod: 'Uncompressed'

NumChannels: 1

SampleRate: 44100

TotalSamples: 51200

Duration: 1.160997732426304

BitsPerSample: 16

fs =

44100

my_Writer =

dsp.AudioFileWriter with properties:

Filename: 'C:\Users\psycuser\Desktop\MatlabPrograms\native_egg_sound\output.wav'

FileFormat: 'WAV'

SampleRate: 44100

Compressor: 'None (uncompressed)'

DataType: 'int16'

available_playRecs =

audioPlayerRecorder with properties:

Device: 'Default'

SampleRate: 44100

devices =

1×2 cell array

{'Default'} {'Realtek ASIO'}

Error using audioDeviceReader/setup

PortAudio Error: Unanticipated host error

Error using audioDeviceReader/setup

PortAudio Error: Invalid sample rate

Error in audioDeviceReader/setupImpl

Error in audioPlayerRecorder/setupImpl

Error in PR_trouble (line 31)

audioRecorded = my_aPR ( audioToPlay ); - Show complete stack trace

Answer 1

[Saurav Chaudhary]

As can be seen the first error you get is :

PortAudio Error: Unanticipated host error

Go through the following MATLAB answer which aims at resolving this issue-

https://www.mathworks.com/matlabcentral/answers/343367-error-using-audiorecorder-resume-line-609-device-error-unanticipated-host-error?s_tid=answers_rc1-3_p3_Topic

The next error you are getting is :

PortAudio Error: Invalid sample rate

For this one workaround would be to look at the maximum sample rate supported, you can go through the below MATLAB answer to find out about this -

https://www.mathworks.com/matlabcentral/answers/195697-what-is-the-maximum-sample-rate-supported-by-sound

Hope, this helps.