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One of these things is not like the other...
AIFF is the acronym for Audio Interchange File Format, an uncompressed digital file. An interchange format would be useless if it could not resolve sound data that preserves the full characteristics of the original recording. Two of the standard AIFF specifications most affect sound quality of the resulting file. Larger word lengths (sample size setting) generally result in a higher quality representation of the original sound. CDs are encoded in 16 bit chunks, and is the default import word length in iTunes. Sampling frequency (sample rate setting) is the number of times the sound event is quantized within a given time period, given in Khz, or the number of samples per second. The Nyquist sampling theorem states the highest possible pitch in a sound is one-half the sampling frequency. A sample rate of 44.1, the frequency used for CD sound and as iTunes default sample rate, allows for a 22.05 Khz maximum pitch, considered the average top frequency audible to humans. Therefore, an iTunes AIF file using the default settings should have no discernible difference in quality to the human ear. An MP3 or ACC encoded from an AIF file would be sonically identical to an MP3 or ACC encoded directly from the CD, as they are both the same resolution, and uncompressed. It would be quite interesting if you could provide data that showed this interchange format is not suitable for interchanging formats. only re-encoding a lossy format (MP3, ACC, JPEG) to another will result in further degradation of the file. |
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