Patent ID: 6138090
Filing Date: 2000-10-24
Classification: G10L

Abstract:
A encoded-sound-code decoding method of performing a decoding process starting from some midpoint of a sequence of codes formed by a coding method of performing a sound-signal coding process on a difference between an input signal x.sub.n and a prediction value y.sub.n for the input signal by using a quantization step size .DELTA..sub.n, the encoded-sound-code decoding method comprising the steps of:a first step of defining a predetermined value as an initial value of a sound parameter necessary for the decoding process;a second step of performing the decoding process on a predetermined number of sample codes starting from a sound-reproduction start position at some midpoint of the code sequence based on the initial value of the sound parameter defined at the first step;third step of comparing a judgment parameter value in correspondence to a decoding result with a predetermined threshold value thereby determining whether the decoding result is proper or not;a fourth step in which, in response to a determination that the decoding result is proper, codes are sequentially decoded from said sound-reproduction start position at some midpoint of the code sequence based on the initial value of the sound parameter defined at the first step;a fifth step in which, in response to a determination that the decoding result is not proper, the initial value of the sound parameter defined at the first step is modified and then the processes of the second and third steps are performed; anda sixth step in which, after repetitions of the process of the fifth step until the decoding result is determined to be proper, codes are sequentially decoded from said sound-reproduction start position at some midpoint of the code sequence based on the modified initial value of the sound parameter.