| 摘要 |
PURPOSE:To decrease a necessary arithmetic quantity and to realize a small voice encoder on a real time basis by storing a white noise system thinned to a first linearity prediction analytic processing part, which extracts a first linearity predicting parameter, as a code. CONSTITUTION:A noise wave form outputted from a white noise code book 4, which has been thinned by 1/3, passes through an amplifier 34, pitch periodicity is predicted by a long term predicting device 33, further the section between neighboring samples is predicted by a short-term predicting device 32, a regenerative signal is generated, it is weighted so as to conform to the voice spectra of a human being by an acoustic sense weight processing part 31, and applied to a comparator 61. Since an input signal to have passed through an acoustic sense weight processing part 22 is applied to the comparator, an error signal is fetched, and applied to an error evaluating part 62. Presently error power is evaluated in a subframe by obtaining the square sum of the error signal. The same processings are executed for the all codes in the white noise code book, the codes are evaluated, and the optimal code to apply the minimum error power is selected. |
