Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power; other types are required for radio frequency measurements.
32.
These patterns, varying at rates less than lower audio frequencies, have shapes that can be identified much like patterns in vision.
33.
However, in the Earth's magnetic field the same nuclei resonate at audio frequencies of around 2 kHz and generate very weak signals.
34.
By oversampling by 2.05 kHz, both aliasing and attenuation of higher audio frequencies can be prevented even with less than ideal filters.
35.
The results were reported in BBC Research Report EL-17 1968 / 8 entitled " The Assessment of Noise in Audio Frequency Circuits ".
36.
A disadvantage is the size, weight and cost of the transformer as well as its limited audio frequency response, especially for very powerful transmitters.
37.
The result is determined by the lowest curve which is not touched by the measured spectrum at any position in the audio frequency range.
38.
This introduces a requirement to perform full spectrum operational tests using shake tables that can produce high power mechanical vibration across all anticipated audio frequencies.
39.
Duddell's " musical arc " operated at audio frequencies, and Duddell himself concluded that it was impossible to make the arc oscillate at radio frequencies.
40.
Most early telephone-line modems used audio frequency-shift keying ( AFSK ) to send and receive data at rates up to about 1200 bits per second.
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