Abstract
The wireless recorder for heart and lung sounds is intuitively convenient to the medical doctors and the patients for its portability which makes the auscultation be possible in a certain range. Such a recorder facilitates increased patient movement (postures and exercises) during diagnosis. Therefore, a wireless communication system for lung sound recording has been developed in this study. Two unidirectional microphones (SM35 and Beta 98H/C, Shure), a wireless body pack transmitter (PGXD1, Shure), and a wireless receiver (PGXD4, Shure) were used in our recording system. The detected sound was transmitted to a mixing console (MG06, Yamaha) for amplification. The system characteristics are as follows: (1) offers excellent low-frequency response, (2) has unidirectional microphone sensing, (3) blocks noise from the environment, (4) records sounds of moving and exercising people, and (5) records other physiological sounds. All of SNREN>35 in tests under the environmental noises in the range of 25 to 40 dB encouraged us to neglect the influences of the environmental noise. The findings strongly recommend that the proposed recording system be adopted by groups researching lung sounds because it reduces the number of complex devices and algorithms necessary for noise reduction, offers a high SNR, and facilitates device use in various environments. Furthermore, the developed system can be used to record lung sounds because of its excellent low-frequency response, especially, using the instrumentation microphone.
Highlights
The characteristics of the microphone strongly influence the quality of the recorded lung sounds
The most popular microphones which the research groups employed in lung sound studies were SonyTM ECM77B omnidirectional electret condenser microphone [1,2,3,4,5,6,7] and SonyTM ECM- T140 [8,9,10,11,12,13], and T150 electret condenser microphones with air coupler [14,15,16,17,18]
Observing the time sequence of the cited studies [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18], the findings were that the applications of linguistics and voice recognition at first, and the studies related to the lung sounds were continuously employed the SonyTM ECM-77B, T140, and T150 omnidirectional microphones
Summary
The characteristics of the microphone strongly influence the quality of the recorded lung sounds. The most popular microphones which the research groups employed in lung sound studies were SonyTM ECM77B omnidirectional electret condenser microphone [1,2,3,4,5,6,7] and SonyTM ECM- T140 [8,9,10,11,12,13], and T150 electret condenser microphones with air coupler [14,15,16,17,18]. Many previous studies have recorded sound data by using single-wired and omnidirectional electret condenser microphones. Shaharum et al [19] reviewed the reliability of sound obtained from the trachea using the wheeze data collection method in studies reported between 1985 and 2009.
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