The consequences of the fact that the human auditory system is the final receiver in almost all cases of sound recording, transmission, and reproduction are discussed. The strategies of processing and transmitting sound as effectively as possible on one hand, and also as -undistorted- as possible on the other need adaption to the perception characteristics of the auditory system. The transformation of frequency to critical-band rate as well as the transformation of level to specific loudness are the tools used for this adaption. Examples for practical applications of the basic idea are illustrated.
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