The branch of
psychoacoustics examines the concept of auditory masking and its effect on compression.
Within each subband where blurring occurs the presence of a strong tonal signal can mask a
region of weaker signals. This is evidenced in the following figure.
If the noise resulting from approximation of sound data can be kept below the masking
threshold for each partition, then the compression result should be indistinguishable from
the original audio data.
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