Patent ID: 8914280
Filing Date: 2014-12-16
Classification: G10L

Abstract:
1. An apparatus for encoding a speech signal, the apparatus comprising: a linear predictive (LP) analysis unit/quantization unit to determine an immittance spectral frequencies (ISF) index; a closed loop pitch search unit to determine a pitch index; a fixed codebook search unit to determine a code index; a gain vector quantization (VQ) unit to determine a gain VQ index of each of an adaptive codebook and a fixed codebook; and a bit rate control unit to control at least two indexes of the ISF index, the pitch index, the code index, and the gain VQ index to be encoded at a variable bit rate, wherein the bit rate control unit compares reserved bits with a reference value, and selects a linear predictive coefficient quantizer for control of the variable bit rate of the ISF index, based on a result of the comparison.