A new definition of S/N is proposed in order to evaluate systems whose noise is a function of the signal, such as compressors, expanders, and dynamic noise filters. This new definition defines S/N as the ratio of short-term average signal-to-noise, instead of the usual definition of the maximum signal to the noise in the absence of signal. A pilot psychophysical investigation shows that a system need have only 52 dB S/N in order for the noise to remain undetectable. For wide dynamic-range classical music this translates into a ratio of 79 dB using the classical definition. The data also predict the optimum compander characteristics for noise reduction systems.
(See document for exact affiliation information.)
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member Join the AES. If you need to check your member status, login to the Member Portal.
