Made up of 80 bits per frame, where there may be 24, 25 or 30 frames per second, LTC timecode varies from 960 Hz ( binary zeros at 24 frames / s ) to 2400 Hz ( binary ones at 30 frames / s ), and thus is comfortably in the audio frequency range.
12.
If the oscillator operates above the audio frequency range ( > 20 kHz ), the generator will often include some sort of modulation function such as amplitude modulation ( AM ), frequency modulation ( FM ), or phase modulation ( PM ) as well as a second oscillator that provides an audio frequency modulation waveform.
13.
In the audio frequency range ( below 1 100 kHz ), " 1 / " f " " noise becomes dominant, which rises like 1 / " f " . ( This is the reason for the relatively high noise resistamnce of the EF86 in the above example . ) Thus, tubes with low noise at high frequency do not necessarily have low noise in the audio frequency range.
14.
In the audio frequency range ( below 1 100 kHz ), " 1 / " f " " noise becomes dominant, which rises like 1 / " f " . ( This is the reason for the relatively high noise resistamnce of the EF86 in the above example . ) Thus, tubes with low noise at high frequency do not necessarily have low noise in the audio frequency range.
