This document discusses how analog voice signals are measured, the units used, and the points of reference used when you measure. The quality of a transmission system is defined by the difference between spoken voice at one end and reproduced voice at the other end.
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The extinguishment of debt. While defeasance technically refers to extinguishment by any method (for example, by payment to the creditor), in practice it is generally used to mean discharging debt by presenting a portfolio of securities (usually, Treasury obligations) to a trustee who will use the cash flow to service the old debt.