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2. Signal generator - Wikipedia

   en.wikipedia.org/wiki/Signal_generator

   A signal generator is one of a class of electronic devices that generates electrical signals with set properties of amplitude, frequency, and wave shape. These generated signals are used as a stimulus for electronic measurements, typically used in designing, testing, troubleshooting, and repairing electronic or electroacoustic devices, though it often has artistic uses as well.

3. DTMF - Wikipedia

   en.wikipedia.org/wiki/DTMF

   The commonly used keypad has four rows and three columns, but a fourth column is present for some applications. Pressing a key sends a combination of the row and column frequencies. For example, the 1 key produces a superimposition of a 697 Hz low tone and a 1209 Hz high tone. Initial pushbutton designs employed levers, enabling each button to ...

4. The Mosquito - Wikipedia

   en.wikipedia.org/wiki/The_Mosquito

   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.

5. Function generator - Wikipedia

   en.wikipedia.org/wiki/Function_generator

   Two such walking ring counters are perhaps the simplest way to generate the continuous-phase frequency-shift keying used in dual-tone multi-frequency signaling and early modem tones. [4] A typical function generator can provide frequencies up to 20 MHz.

6. Additive synthesis - Wikipedia

   en.wikipedia.org/wiki/Additive_synthesis

   Schematic diagram of additive synthesis. The inputs to the oscillators are frequencies and amplitudes .. Harmonic additive synthesis is closely related to the concept of a Fourier series which is a way of expressing a periodic function as the sum of sinusoidal functions with frequencies equal to integer multiples of a common fundamental frequency.

7. High frequency - Wikipedia

   en.wikipedia.org/wiki/High_frequency

   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).