Frequency musical scales

Like sound ascending a musical scale, the radiance increases, passing even beyond the frequency visible to spirit, until all is absolute blackness, yet pervaded with the iridescence of a raven s plumage. Here, within the thrice-radiant Darkness of Ain, you are alone with the Alone, the All-One. 

Another study was designed to determine how neural circuits are organized to provide a perception of sound. Specifically, Williamson wanted to find whether individuals have a tone map across the auditory cortex—that is, whether tones of different frequencies evoke neural activity at different locations. While Williamson s subjects listened to notes of a scale, the sensors hunted for magnetic field variations, and the researchers were able to monitor the movement of nerve impulses from cell group to cell group inside the brain. It appeared that the brain assigned equal numbers of neurons to each octave of the musical scale, much like the arrangement of keys on a piano. This... 

The notes used in a musical score belong to a musical scale, divided by the octave. In a given scale the sounds associated with successive notes are in specific frequency ratios (or intervals in a logarithmic scale). Notes differing by a frequency factor of 2 sound similar and therefore bear the same name, with a number specifying the octave rank. Table I displays the octave corresponding to the middle part of the piano. Piano keys can play sounds extending over 8 octaves there is a factor 2 = 256 between the fi equencies of the sounds played by the farthest piano keys (about 20 to 5,000 Hz). 

Attenuation and Speed of Sound in Air as a Function of Humidity and Frequency Speed of Sound in Dry Air Musical Scales... 

Electromagnetic waves are not to be confused with soimd waves that are generated by explosions, thunder, and musical instruments. Sound waves are compression waves of relatively low frequency (256 Hz for middle C on the musical scale) that travel at much lower speeds than electromagnetic waves (about 331 m/s = 12 mi/min in air). 

In addition to waves in strings, other oscillations such as sound waves obey wave equations. The speed of sound in air at sea level and 20°C is 343 ms . Find the wavelength of a sound wave with a frequency of 440 s, or 440 Hertz. (This frequency is the frequency of A above middle C in the musical scale.)... 

Human loudness perception depends in a complex manner on both frequency and the overall loudness of sound. (For example, bass is more difficult to hear in music played at low volume than in the same music played at high volume.) To capture this behavior, two weighting scales have been developed for use in sound hazard analysis. The most common of these is the A weighting scale, which is commonly used to assess occupational and environmental noise. The A scale weights sounds in the 1000-6000 Hz range much more heavily than low-frequency sounds. The A-weighted intensities (dBA) of some common sounds are listed in Table 5. By contrast, the C weighting scale is used for very loud sounds and is a much flatter function of frequency. 

It is well known that human sensitivity to the frequency scale is not linear for instance we know that musical relationships are clearly logarithmic. Studies into the low-level perception of sounds have resulted in a number of auditory scales which define a new frequency range that is more in... 

Table III. - The transformation of data from the photoelectron spectrum of phosphabenzene into musical notes. Column 1 gives the measured ionization potentials in eV. Column 2 gives the successive differences of ionization potentials in Hz. These latter are rescaled into audible frequencies Vj (column 3) by using the scaling factor k. The frequency v i of the closest note in the even tempered scale is given in column 4. Column 5 gives the names of the notes in the international (CDEFGABC) or roman do re mi fa sol la si do) notations, the frequency of A3 la3) being assigned the value 440 Hz. Note durations (column 6) are taken proportional to the intensities of the peaks in the spectrum, the unit being the sixteenth.

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