نتایج جستجو برای: earphone
تعداد نتایج: 175 فیلتر نتایج به سال:
The ARCADE 2 instrument has measured the absolute temperature of the sky at frequencies 3, 8, 10, 30, and 90 GHz, using an open-aperture cryogenic instrument observing at balloon altitudes with no emissive windows between the beam-forming optics and the sky. An external blackbody calibrator provides an in situ reference. Systematic errors were greatly reduced by using differential radiometers a...
We report the results of an effort to measure the low-frequency portion of the spectrum of the cosmic microwave background (CMB) radiation, using a balloon-borne instrument called the Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission (ARCADE). These measurements are to search for deviations from a thermal spectrum that are expected to exist in the CMB as a result of various ...
Pitch of pure tones was measured by absolute magnitude estimation. Results show that the function relating pitch to frequency in log-log coordinates is much steeper below about 250 Hz than at higher frequencies. me results also show that in part of the scale pitch is proportional to the cochlear frequency coordinates. INTRODUCTION The psychological scale of pitch was investigated by a number of...
In this study, we describe a technique for estimating meal times using an earphone-type wearable sensor. A small optical sensor composed of a light-emitting diode and phototransistor is inserted into the ear hole of a user and estimates the meal times of the user from the time variations in the amount of light received. This is achieved by emitting light toward the inside of the ear canal and r...
BACKGROUND No clear evidence is available in the literature regarding the acute effect of different styles of music on cardiac autonomic control. OBJECTIVES The present study aimed to evaluate the acute effects of classical baroque and heavy metal musical auditory stimulation on Heart Rate Variability (HRV) in healthy men. PATIENTS AND METHODS In this study, HRV was analyzed regarding time ...
در ابتدای این تحقیق تلاش شده است تا ویژگی های تقویت کننده کم نویز و مخلوط کننده فرکانس بالا جهت پیاده سازی گیرنده تبدیل مستقیم برای استاندارد dvb-h ، استخراج گردد. به این منظور ابتدا چگونگی ارسال به کوتاهی مورد بررسی قرار گرفت تا الگوهای مورد نیاز برای استخراج ویژگی های گیرنده روشن گردند. به کمک الگوها، حد اقل های عدد نویز و دامنه برخورد مرتبه سوم برای دو واحد تقویت کننده کم نویز و مخلوط کننده ...
BACKGROUND Hearing loss can lead to a number of disabilities, subsequently reducing the quality of life. In general, hearing thresholds of adolescents are better than adults and the elderly. However, occasionally, adolescents acquire hearing loss for a number of reasons. In this study, our goal was to estimate the prevalence of hearing loss in the Korean population and to investigate the factor...
BACKGROUND Occupational hearing loss and its diagnostic methods are one of the subjects of great interest in the field of occupational medicine and hygiene. The primary aim of the work was to determine the characteristics of ready-made filters used to process the brainstem auditory evoked potentials. No data on the properties of these filters have prompted the author to verify the algorithm of ...
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