There are many clicks, buzzes and other sounds in the ocean from animals, but the 37.5 kilohertz
pulse was selected for underwater locator beacons on black boxes because there is nothing else in the sea that would naturally make that sound, said William Waldock, an expert on search and rescue who teaches accident investigation at Embry-Riddle Aeronautical University in Prescott, Arizona.
Unless the board is operating in the low kilohertz
range, functional test and part programming must be performed with a minimum number of nails contacting the board.
Depending on the desired direction of motion, the left or right electrode of the piezoceramic plate is excited to produce high-frequency oscillations of hundreds of kilohertz
According to the WHO, electric and magnetic fields in the frequency up to 100 kilohertz
can affect the nervous systems of people exposed at high levels, resulting in acute health effects such as nerve stimulation.
The Mosquito emits a whining sound at 18 kilohertz
that switches on and off four times a second for up to 20 minutes.
A cat can hear sounds with frequencies from 45 to 60,000 vibrations per second (one vibration per second is called a hertz; 1,000 vibrations per second is called a kilohertz
) as opposed to a human who can hear from 20 to 20,000 hertz.
Rise fronts attained values of up to tens kilovolts per microsecond and voltage pulse repetition frequency up to some tens of kilohertz
. However, this technology is an advantage for a drive control; the voltage waveforms generated by power frequency converters may affect significantly the reliability of the electric motor insulation systems.
According to The Merck Manual of Diagnosis and Therapy, this condition begins after the age of 20, first affecting the highest hearing frequencies (18 to 20 kilohertz
), although most common in persons over 65.
Using equipment designed to study the very high-pitched bleeps that bats make, scientists have found that the frog calls also include very high-pitched chirps that topped 20 kilohertz
(20,000 cycles per second)--sound frequencies that people can't hear.
Two integrated analog codecs are also included to support both narrowband 8 Kilohertz
(KHz) and wideband 16 KHz sampling that enables IP phone networks to deliver high-quality voice transmission.
His lyrical, informal prose is accompanied by scientific diagrams of pitches and notes--musical transcriptions written in kilohertz
rather than eighth notes.
Horizontal Scan Rate: The speed in kilohertz
at which the horizontallines of the projected image are created.