
Using apps to analyze COVID-19 sounds for diagnosis is a rapidly evolving field, with several apps already available that can help identify the disease based on lung sounds.
These apps use advanced algorithms to analyze the sounds, which can be recorded using a smartphone or a stethoscope.
Researchers have found that certain sounds are more prevalent in COVID-19 patients, such as crackles and wheezes, which can be detected using these apps.
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COVID-19 Sound Analysis
Several apps have been developed to analyze COVID-19 sounds, with the goal of establishing diagnostic potential. These apps collect audio data from coughs, breathing, and voices, among other sounds.
Researchers at the University of Cambridge developed the COVID-19 Sounds App, which collected 6,000 audio samples by May 1st, 2020. The app is available on web, Android, and iOS platforms.
New York University's Breathe for Science app collects audio data from coughs and medical histories, with the aim of establishing diagnostic potential.
Coughvid, developed by École Polytechnique Fédérale de Lausanne, collects audio data from coughs and is available on web and Android platforms.
Deep learning has been used to analyze COVID-19 sounds, achieving high levels of accuracy in discriminating between COVID-19 and healthy subjects.
A study using deep learning achieved 94.58% accuracy in discriminating between COVID-19 and healthy subjects, with a 100% accuracy in predicting asymptomatic COVID-19 subjects.
ResApp, developed by Australian scientists, uses machine learning to analyze the sounds of cough and can detect COVID-19 with 92% accuracy.
The app was tested on 741 patients in the US and India, including 446 with COVID-19, and showed high specificity in detecting COVID-19, with 90% specificity.
Here is a list of some of the apps mentioned:
App Performance and Accuracy
The proposed deep learning model achieved an accuracy of 94.58% in discriminating between COVID-19 and healthy subjects using the shallow breathing dataset.
In terms of performance, the model correctly predicted 113 COVID-19 subjects and 114 healthy subjects out of 120 total subjects.
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Using the deep breathing dataset, the model's accuracy dropped slightly to 92.08%, correctly predicting 109 COVID-19 subjects and 112 healthy subjects.
The model's sensitivity and specificity measures were 94.21% and 94.96% for the shallow dataset, and 93.16% and 91.06% for the deep dataset.
The precision was highest for the shallow dataset at 95.00%, while the deep dataset had the lowest precision value at 90.83%.
The model's AUROC was 0.90 for the shallow breathing dataset, while it was slightly lower at 0.86 for the deep breathing dataset.
The app ResApp, which uses machine learning to analyze cough sounds, achieved a 92% accuracy rate in detecting COVID-19 in a study of 741 patients.
The app was also tested on 1,007 patients with other respiratory conditions, and it was able to accurately detect COVID-19 with 90% specificity.
The proposed deep learning framework had high levels of accuracy in discriminating between COVID-19 and healthy subjects, with a 100.00% accuracy in predicting asymptomatic COVID-19 subjects.
The model's simplicity and effective performance make it suitable for real-time and direct connectivity between the subject and family or healthcare authorities.
Data Collection and Recording
Using a smartphone to record breathing sounds allows for a faster data acquisition process from subjects or patients, while also providing highly comparable and acceptable diagnostic performance.
Smartphone-based lung auscultation ensures better social distancing behavior during lockdowns, making it a valuable tool for rapid and time-efficient detection of diseases despite strong restrictions.
By visually inspecting COVID-19 and healthy subjects' breathing recordings, an abnormal nature was usually observed in COVID-19 subjects, while healthy subjects had a more regular pattern during breathing.
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Methodologies
Speech and sound analysis by artificial intelligence has the potential to help with data collection and recording. Machine learning methods have been explored to recognize and diagnose coughs from different diseases.
Convolutional neural networks (CNNs) have been used to detect cough within environment audio and diagnose three potential illnesses: bronchitis, bronchiolitis, and pertussis. These illnesses have unique cough audio features.
A large-scale crowdsourced dataset of respiratory sounds has been collected to aid diagnosis of COVID-19. Coughs and breathing sounds are sufficient to distinguish users affected by COVID-19 from those affected by asthma or healthy controls.
Automated systems to screen for respiratory diseases based on voice, raw cough, or other sound data have positive medical applications in both clinical and public health arenas.
Smartphone-Based Breathing Recordings
Smartphone-Based Breathing Recordings offer a faster data acquisition process from subjects or patients, allowing for a rapid and time-efficient detection of diseases despite strong restrictions.
Utilizing a smartphone device to acquire breathing recordings allows for a better social distancing behavior during lock downs due to pandemics such as COVID-19.
The visual inspection of COVID-19 and healthy subjects' breathing recordings revealed an abnormal nature in COVID-19 subjects, with a more regular pattern observed in healthy subjects.
The MFCC transformation of COVID-19 and healthy subjects' recordings returned similar observations, indicating the importance of extracting internal attributes carried by the recordings.
Asymptomatic subjects had a distribution of values that was close in shape to the distribution of healthy subjects, but skewed towards the right side of the zero mean, making it easier to discriminate them from healthy subjects.
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Deep Learning and Diagnosis
Deep learning is a powerful tool that's helping us diagnose COVID-19 more accurately. This technology is particularly useful in situations where medical experts are overwhelmed, as it can reduce the dependency on clinicians and nurses.

The proposed deep learning framework has shown high levels of accuracy in discriminating between COVID-19 and healthy subjects, with an accuracy measure of 94.58% using the shallow dataset.
One of the key strengths of this deep learning approach is its ability to extract features from 1D signals, such as breathing recordings, which makes it simple and not memory exhausting. This simplicity also allows the model to be easily embedded within smartphone applications and internet-of-things tools.
The model's performance is impressive, with a sensitivity and specificity measures of 94.21% and 94.96%, respectively, using the shallow dataset. This high performance level is also supported by the area under the receiver operating characteristic (AUROC) curve, which is 0.90.
Here are some of the apps that are using deep learning to analyze COVID-19 sounds:
The model's decision boundary of 0.5 is used to discriminate between COVID-19 and healthy subjects, with values representing a normalized probability regarding the confidence in predicting these subjects as carrying COVID-19.
Comparison and Discussion
Analyzing COVID-19 sounds with apps can be a fascinating topic.
Some apps, like Sound Health, use machine learning algorithms to identify coughs and other COVID-19-related sounds. These algorithms can be trained on large datasets of audio recordings to improve accuracy.
The accuracy of these apps can be affected by background noise and the quality of the audio recording. This is because background noise can mask or distort the sounds being analyzed.
App developers are working to improve the accuracy of their apps by incorporating additional features, such as noise reduction algorithms. This can help to reduce the impact of background noise on the analysis.
While some apps may have a higher accuracy rate than others, it's essential to note that no app is 100% accurate. This is because the analysis is only as good as the data it's trained on.
The COVID-19 sounds apps can be a useful tool for healthcare professionals, but they should not be relied upon as the sole means of diagnosis.
Description and Overview

This app is designed to collect data on sounds of the voice, breathing, and coughing to help develop machine learning algorithms for diagnosing COVID-19.
The data will be collected through an application that participants can download, which will ask for basic demographics and medical history, as well as voice samples and a few seconds of breathing and coughing.
The app will only collect data when participants actively interact with it, and it won't be tracking them. The data will be stored on University servers and used solely for research purposes.
The app will be available in multiple languages, including English, French, German, Italian, and Spanish, making it accessible to a wider range of participants.
Participants will be asked if they have tested positive for the virus, and the data will be used to develop a dataset that can be shared with other researchers after initial analysis and pre-processing.
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