| 摘要 |
<p>A speech coding device having a first input for receiving a first error word determined upon an ideal and an estimated excitation word itself determined from a speech signal, said first input being connected to a second input of a first unit, a third input of which being connected to a code word generator, an output of said first unit being connected to a filter unit which is close looped with said code word generator, said said code word generator being provided for generating a first series of first code words having a substantially periodic character with a period associated with an input pitch period, said code word generator being also provided for generating a second series of second code words having a substantially non-periodic character, said coding device comprises processing means provided for determining upon words output by said filter unit an energy value and for selecting among said code words the one having produced the lowest energy value.</p> |
