I can hear sound from iphone and computer, but I do not hear any
sound from Android phone. It is because some cheap
smartphones and cheap Bluetooth headphones will compress the dynamic range of
the sound, causing in cases with a higher frequency for you to hear nothing at
all. Also, if some devices have an equalizing function, it will cause the sound
to distort and also lead to ineffectiveness.
If it is no sound, its healing is not effect,
however, even if the sound is not too loud, it still works for you. As
conclusion, we recommend that you select a headphone which can play sound from Android
phone, then set it to an audible level and not adjust the volume frequently.
Additional
Information: What is the Hearing Threshold?
Healthy young adults should be able to hear frequencies anywhere
between 20 and 20.000 Hz. The most important frequencies for speech and
language are between 250 and 8000 Hz. What we call the hearing “threshold” is
the lowest intensity where a person begins to hear a sound. Normally, this
threshold for loudness is between 0 dB and 20 dB. But the hearing threshold of
sound frequencies varies from one individual to another. This explains why you
might hear a noise from a near construction site or the neighbors down the
street, but your friend does not.
Hearing range describes the range of frequencies that can be heard
by humans or other animals, though it can also refer to the range
of levels. The human range is commonly given as 20 to 20,000 Hz, although there
is considerable variation between individuals, especially at high frequencies,
and a gradual loss of sensitivity to higher frequencies with age is considered
normal. Sensitivity also varies with frequency, as shown by equal-loudness
contours. Routine investigation for hearing loss usually involves an audiogram
which shows threshold levels relative to a normal. Several animal species are
able to hear frequencies well beyond the human hearing range. Some dolphins and
bats, for example, can hear frequencies up to 100,000 Hz. Elephants can
hear sounds at 14–16 Hz, while some whales can hear infrasonic sounds as
low as 7 Hz.
Additional
Information: Are Intensity and Frequency of
Sound the Same?
The
answer to this question is clearly no. You might suspect, that the higher the
frequency, the louder we perceive a noise, but frequency does not tell us how
loud a sound is. Intensity or loudness is the amount of energy of a vibration
and is measured in decibels (dB). If a sound is loud, it has a high intensity.
