On Monday, October 20, 2003, at 04:24 AM, Grigory Abuladze wrote:
Xr = is^(4/3) * 2^(exp) (sign not discussed)
What value exp can be and what step? -88.5 <= exp <= 11.5, 0 <= is[i] <= 8207 are this equation true?
I calculate -81.5 <= exp <= 11.25 based on the theoretical limits of the requantization formula variables.
Also 0 <= is[i] <= 8206, although there is some debate over whether ISO/IEC 11172-3 actually permits values greater than 8191.
Thanks for answer!
and one more Does it true |Xr|<1 ? and is[i] & exp managed so above statement is always correct?
In general, no, you cannot assume this is true although it usually is. When |Xr|>1 it is usually not much greater than 1, but there are no technical boundaries. The end goal is to have the PCM after synthesis also |s|<1, but this too is not guaranteed, and leads to the need for clipping or other reduction mechanisms outside the decoder.