KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Author: search.filters.author.Chunhakam, PuripakSubject: search.filters.subject.Bluetooth

Search Results

Now showing 1 - 2 of 2
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Bluetooth Breathing Sound Detection Device Based on Time and Frequency Domain Analyze
    (2022-04-20)
    Chunhakam, Puripak
    ;
    Panpho, Phakakorn
    ;
    Wardkein, Paramote
    In this paper, a wearable and simple system for breathing sounds detection from the left and right External Auditory Canal (EAC) was proposed. This system consists of two main parts: 1) Hardware design for detecting input breathing sound signal and 2) software design for processing and displaying the output results. Two condenser microphones are used to detect breathing sound and the detected signal is transmitted to the main processor by a Bluetooth channel. Two main proposed algorithms to detect breathing sounds and evaluate the number of respirations were presented: the first algorithm employs sound signals in the time domain to detect breathing sound with power window threshold scanning and count breathing pulses. For the second one, Fast Fourier transforms (FFT) along with detecting the maximum magnitude of its low-frequency elements in the breathing frequency band is presented and it is interpreted as respiration rate. The results of both algorithms show that the system can accurately monitor breathing. The percentage of error for the 1st and 2nd algorithms was 6.77% and 5.00%, respectively. The experimental results presented that this breathing detection system can measure and provide the breathing and respiration rate as expected.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    A New Bluetooth Wireless Speech Microphone from the Outer Ears
    (2022-01-01)
    Chunhakam, Puripak
    ;
    Wardkien, Paramote
    ;
    Boonjan, Surapol
    Today, microphones are essential equipment in variety of activities such as meetings, conferences, remote online learning. One problem with today's microphones is that ambient noise makes audio data unclear. In this article, we present a microphone that picks up sound of speech from the outer ear. It consists of two condenser microphone sensors mounted on the left and right ears like an earphone. Two different signals for the left and right ears are amplified by an instrumentation amplifier. Because it is attached to the outer ear, environmental noise is reduced. Moreover, the amplified signal is transmitted with a Bluetooth transmitter to transmit signals without wires causing comfort and flexibility to use. The results show that speech frequencies can be obtained over a wide frequency range and that environmental noise is canceled as expected.