| 摘要 |
A long term predictor (107) for use in speech coding and decoding has delay and gain parameters controlled by bits of an incoming signal. However, the long term predictor (107) is simplified in that a single delay word also controls the gain, this reducing the bits necessary to control the long term predictor (107) and therefore making available more bits elsewhere in the apparatus, for instance for use in the codebook store (200). The gain may simply have two values, zero and 0.95, the long term predictor (107) effectively being switched off when the gain is set to zero. This may be set by a delay word in which all but the least significant bit of the bits in the delay word are zero, the delay in the long term predictor (107) then anyway being minimum. <IMAGE> |
