Speech-encoding rate decision apparatus and method in a variable rate
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United States of America Patent
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May 28, 2002
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app pub date -
Mar 10, 1999
filing date -
Mar 10, 1999
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Abstract
An apparatus and method for determining a speech-encoding rate in a variable rate vocoder are disclosed. A set of thresholds are computed based on background noise energy and its variation. A signal energy value of an input signal is computed, and a rate decision is made based on comparisons of the computed signal energy value with the computed thresholds. In one embodiment, a preliminary rate and a hangover interval are first computed based on the comparisons. The preliminary rate decision is then modified to take into account hangover constraints, a long term prediction gain and minimum and maximum rate constraints.
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