Post by founder on Apr 5, 2009 22:48:03 GMT -5
Electronic Voice Phenomena and megahertz
While it is a true general statement that the frequency of the human voice is
about 300 to 3000 Hz, this statement is generalized, over-simplified,
and not entirely accurate. In fact, the human voice ranges from 20 Hz to about 14,000
Hz.
ELF = Extremely Low Frequency (30 to 300 Hertz)
Measuring terms: 1,000,000 cycles per second = Megahertz (MHz)
1,000 cycles per second = Kilohertz (KHz)
1 cycle per second = Hertz (Hz)
These frequency numbers are in Hertz (cycles per second)
1 Approx. beginning of brain waves
6.66 Theta brain waves
7.85 Alpha brain waves
15.7 Beta brain waves
50 Approx. Upper limit of brain wave frequencies
*** 60 Produces an audible sound ***
~`~.`~
The human ear can nominally hear sounds in the range 20 Hz to 20,000 Hz (20 kHz). This upper limit tends to decrease with age, most adults being unable to hear above 16 kHz. The ear itself does not respond to frequencies below 20 Hz, but these can be perceived via the body's sense of touch. Some recent research has also demonstrated a hypersonic effect which is that although sounds above 20 kHz cannot consciously be heard, they can have an effect on the listener.
Radio Rod
While it is a true general statement that the frequency of the human voice is
about 300 to 3000 Hz, this statement is generalized, over-simplified,
and not entirely accurate. In fact, the human voice ranges from 20 Hz to about 14,000
Hz.
ELF = Extremely Low Frequency (30 to 300 Hertz)
Measuring terms: 1,000,000 cycles per second = Megahertz (MHz)
1,000 cycles per second = Kilohertz (KHz)
1 cycle per second = Hertz (Hz)
These frequency numbers are in Hertz (cycles per second)
1 Approx. beginning of brain waves
6.66 Theta brain waves
7.85 Alpha brain waves
15.7 Beta brain waves
50 Approx. Upper limit of brain wave frequencies
*** 60 Produces an audible sound ***
~`~.`~
The human ear can nominally hear sounds in the range 20 Hz to 20,000 Hz (20 kHz). This upper limit tends to decrease with age, most adults being unable to hear above 16 kHz. The ear itself does not respond to frequencies below 20 Hz, but these can be perceived via the body's sense of touch. Some recent research has also demonstrated a hypersonic effect which is that although sounds above 20 kHz cannot consciously be heard, they can have an effect on the listener.
Radio Rod
