Multi-state speech encoder and decoder
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United States of America Patent
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Nov 3, 1987
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N/A
app pub date -
Mar 12, 1984
filing date -
Mar 12, 1984
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Expired
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Abstract
Audio signals are analyzed for predictable components (reflection coefficients) and non-predictable (residual) components. The original signal state, over a short-term interval of samples (packet) is defined as one of four states: Silence, Hiss, Sigma, or Peaky. The state determines the step-size encoding of the residual quantized signal, which can therefor be encoded more efficiently.
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