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Using his children as test subjects, he determined the frequency of "The Mosquito". [7] The Mosquito was released to the mainstream market in 2005, through Stapleton's company Compound Security Solutions. [8] The current device has two settings: the high frequency sound targeted at youth, and another that can be heard by everyone.
English: The so called "mosquito noise", a 17.4 kHz sine wave, sampled at 48 kHz, created on Audacity in a lossless quality to avoid high frequency cut off and compression artifacts.
A ringtone is the sound made ... The ringing signal in North America is normally specified at ca. 90 volts AC with a frequency of ... in which the high voltage ring ...
Many European, Asian, and Latin American countries use tones that follow or take inspiration from the ETSI recommendations. Almost all of these tones have a frequency of 425 Hz. France uses a slight variation with a higher pitch 440 Hz tone and a cadence of one second of tone followed by three to five seconds of silence.
High frequency (HF) is the ITU designation [1] for the band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters).
Ringing is a telecommunication signal that causes a bell or other device to alert a telephone subscriber to an incoming telephone call.Historically, this entailed sending a high-voltage alternating current over the telephone line to a customer station which contained an electromagnetic bell.
Isochronic tones can quantitatively be distinguished by both the frequency or pitch of the tone itself, and by the interval or frequency of repetition of the tone. While listening to isochronic tones is a technique often employed in the theoretical practice of brainwave entrainment, reliable scientific research into the effectiveness of this ...
The high frequencies may be the same volume as – or louder than – the low frequencies when sent across the line. The loudness difference between the high and low frequencies can be as large as 3 decibels (dB) and is referred to as "twist." The duration of the tone should be at least 537 ms. [1]