Patent ID: 8849658

Claim:
A device comprising: at least one processor; and one or more computer-readable storage memory devices comprising processor-executable instructions which, responsive to execution by the at least one processor, are configured to enable the device to: receive an input signal associated with speech; supply the input signal to a first instance of a prediction filter effective to generate a first predicted signal; subtract the first predicted signal from the input signal effective to generate a modified input signal; supply the modified input signal and a second input signal to an addition stage effective to generate a first addition stage output signal, wherein the second input signal to the addition stage comprises: a first filtered signal subtracted from a second filtered signal, wherein the first filtered signal comprises the first addition stage output signal filtered with a first noise shaping filter comprising a first set of filter coefficients, and wherein the second filtered signal comprises a quantized version of the first addition stage output signal filtered with a second noise shaping filter comprising a second set of filter coefficients; quantize the first addition stage output signal; and supply the quantized first addition stage signal and a third filtered signal to a second addition stage effective to generate an output signal, wherein the third filtered signal comprises the output signal filtered with a second instance of the prediction filter.