| 摘要 |
A method and device for segmenting an electric (acoustic) signal. A number of parameters, for example "log area" parameters, are derived as a function of time from the electric signal (block 2). For consecutive instants the signals of the parameters located within a time interval around each instant are taken up and transition functions (Oi ) are derived therefrom for each instant (block 3). Subsequently similarity factors (cij) are determined each between two transition functions (Oi and Oj) associated with respective proximate instants (i and j) (block 4) and a replacing transition function (Oijc) is derived (block 6) from the transition functions of at least one group of two transition functions for which the associated similarity factor is larger than a reference value V, the transition function (Oijc) replace the aforementioned transition functions from which it is derived (block 7). A combined transition function (Oijc) replacing one of these transition functions is preferably calculated from the aforementioned transition functions, while the other of these transition functions are omitted. The group of transition functions for which the similarity factor is largest is preferably taken (block 5). The method is subsequently repeated (FIG. 1). Transition functions obtained are very suitable for use in the transmission or recognition of speech signals and for coding diphones. |
