Ultrasound is a cyclic sound pressure wave with a frequency greater than the upper limit of human hearing. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults. The production of ultrasound is used in many different fields, typically to penetrate a medium and measure the reflection signature or supply focused energy. The reflection signature can reveal details about the inner structure of the medium, a property also used by animals such as bats for hunting. The most well known application of ultrasound is its use in sonography to produce pictures of fetuses in the human womb. There are a vast number of other applications as well.
The upper frequency limit in humans (approximately 20 kHz) is due to limitations of the middle ear, which acts as a low-pass filter. Ultrasonic hearing can occur if ultrasound is fed directly into the skull bone and reaches the cochlea through bone conduction without passing through the middle ear.
So coward I am
In my world
Many gorgeous men
Courageous hearts
With stolen coats
And frozen hands
And stingers
'Mong them fingers.
What do you want for me.
I'm not a hero.
Just a cero-plastic puppet.
A stain on a carpet.
I cannot kill.
This is my will.
"No beast so fierce but knows some touch of pity,
But I know none, therefore I'm no beast."
That's all what I know.
I cannot see the end of the road.
It's surrounded by haze.
The consequence is clear: my mind
Is settled down by daze.
Every little voice I hear
Must be ultrasound
Everything I managed to clear
Will be all over (with) mud
I cannot see the end of the road.
It's surrounded by haze.
The consequence is clear: my mind
Is settled down by daze.
This could be the human race.
I can't see your pretty face.
I can't kiss you, I won't kill.
This is my will.
You know, I know I'm no beast.
It's not a gun I'm holding my fist.
(So the teacher's trying to teach you the fucking alphabet?
Well I got a little alphabet of my own, motherfucker and it goes a little something like this)
B is for brain, 'cause I've got brain damage,
I'm deranged, insane, got cerebrum like a cabbage.
H is for honesty, I'm not gonna hide it,
The doc gave me some Prozac 'cause my life is undecided.
R is for relationships and mine are non-existent,
'Cause my friends and my women, I like to keep them distant.
S is for solitude, I live in isolation,
Building beats, cooking treats, making waves like radiation.
My sound travels through walls,
Beats drop like waterfalls.
Stand tall, never fall,
Razorblades and shopping malls.
Suicide, DJs die,
Cut like vinyl super fly.
Time to die, close my eyes,
All I want is for my sound
To multiply
(They're only gonna multiply)
My sound
To multiply
(They're only gonna multiply)
(I hope you learned your times tables bitch!)
D is for death because death is certain,
Even free houses sometimes have to close their curtains.
G is for glory because my fate will be gory
If I do a Kurt Cobain to leave behind my story.
N is for notorious from England to Mauritius,
Biggie Smalls, number one, it's a shame he's now fictitious.
Zed (Z) is for zoo, it's where I belong,
Because my life is like a prison with the music industry lookin' on.
My sound travels through walls,
Beats drop like waterfalls.
Stand tall, never fall,
Razorblades and shopping malls.
Suicide, DJs die,
Cut like vinyl super fly.
Time to die, close my eyes,
All I want is for my sound
To multiply
(They're only gonna multiply)
My sound
To multiply
(They're only gonna multiply)
They're getting bigger
They're getting bigger
They're... they're getting
They're growing
My sound travels through walls,
Beats drop like waterfalls.
Stand tall, never fall,
Razorblades and shopping malls.
Suicide, DJs die,
Cut like vinyl super fly.
Time to die, close my eyes,
All I want is for my sound
To multiply
(They're only gonna multiply)
My sound
To multiply
(They're only gonna multiply)
(I know my ABCs bitch)
Well, well, they multiplied
Well, they multiplied
Ultrasound, can you hear?
Everybody hit the ground
Ultrasound, can you hear?
Everybody hit the ground
Ultrasound, listen up
Cemetery salvation
Ultrasound, listen up
Cemetery salvation
Ultrasound,
Ultrasound.
Ultrasound,
Ultrasound.