Abstract:
Quantizing noise is present whenever analog information is encoded into digital form suitable as an input to any digital system such as a computer or digital transmission...Show MoreMetadata
Abstract:
Quantizing noise is present whenever analog information is encoded into digital form suitable as an input to any digital system such as a computer or digital transmission line. The subjective impairment caused by this noise is frequently measured by the ratio of signal power to frequency-weighted quantizing noise powerS/N_Y. An upper bound onS/N_Yis found such that source encoding systems will always have values ofS/N_Yless than this bound. The bound has the form (in decibels)S/N_Y \leq T_B + T_P + T_S, whereT_Bis a constant that depends on the hit rate of the signal,T_Pdepends on the redundancy (or predictability) of the signal, andT_Sdepends on subjective considerations (as embodied in a subjectively determined frequency-weighting function). The bound is applied to source encoding systems for speech and television signals. By using the frequency-weighting function, bounds on commonly used measures of subjective impairments are possible.
Published in: IEEE Transactions on Information Theory ( Volume: 17, Issue: 3, May 1971)