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Figure 2 shows the time-frequency plot of the short-time Fourier transform (in particular, Gabor transform) results of the audio file. In this plot, horizontal lines with frequencies not greater than 230 Hz represent the fundamental frequencies while horizontal lines with frequencies above 230 Hz represent the harmonic components.
Very high power levels of 160 dB were achieved at frequencies of 2–3 Hz. Test frequencies ranged from 0.5 Hz to 40 Hz. Test subjects suffered motor ataxia, nausea, visual disturbance, degraded task performance and difficulties in communication. These tests are assumed by researchers to be the nucleus of the current urban myth. [2] [3]
The sound appears to pulsate only when heard through both earphones. Time duration of 10 seconds Binaural Beats Base tone 200 Hz, beat frequency from 7 Hz to 12.9 Hz. Time duration of 9 minutes. "Binaural beats were first discovered by physicist Heinrich Wilhelm Dove in 1839.
The frequency range often specified for audio components is between 20 Hz to 20 kHz, which broadly reflects the human hearing range. Well-designed solid-state amplifiers and CD players may have a frequency response that varies by only 0.2 dB between 20 Hz to 20 kHz. [4]
1 hertz (Hz) 1 to 1.66 Hz: Approximate frequency of an adult human's resting heart beat: 1 Hz: 60 bpm, common tempo in music 2 Hz: 120 bpm, common tempo in music ~7.83 Hz: Fundamental frequency of the Schumann resonances: 10 1: 10 hertz 10 Hz: Cyclic rate of a typical automobile engine at idle (equivalent to 600 rpm) 12 Hz
The other, the sum frequency, (F if + F bfo) = 89000 or 91000 Hz, is unneeded. It can be removed by a lowpass filter, such as the radio's speaker, which cannot vibrate at such a high frequency. f BFO = 44000 or 46000 Hz produces the desired 1000 Hz beat frequency and either could be used.
An audio frequency or audible frequency (AF) is a periodic vibration whose frequency is audible to the average human. The SI unit of frequency is the hertz (Hz). It is the property of sound that most determines pitch. [1] The generally accepted standard hearing range for humans is 20 to 20,000 Hz.
Some non-mel auditory-frequency-scale formulas use the same form but with much lower break frequency, not necessarily mapping to 1000 at 1000 Hz; for example the ERB-rate scale of Glasberg and Moore (1990) uses a break point of 228.8 Hz, [15] and the cochlear frequency–place map of Greenwood (1990) uses 165.3 Hz.