摘要 |
Frequency components are calculated from the STP-filtered speech signal. The amplitudes of these are combined in a manner such that the resultant values are associated with frequencies which are situated equidistantly on a linear Bark scale. Said components are quantised, possibly after scaling. In the decoder, the components are again distributed over the frequency spectrum. In the coder, the fundamental regularity D is determined with an LTP technique, after which it is transmitted. In the decoder the phases of the reconstructed signal at the spacing D in the past are determined. These phases are combined with the amplitudes already present in the frequency spectrum, after which transformation back to the time domain takes place. Inverse STP filtering is then carried out. |
申请人 |
KONINKLIJKE PTT NEDERLAND N.V., DEN HAAG/'S-GRAVENHAGE, NL |
发明人 |
BEERENDS, JOHN GERARD, NL-2515 NB THE HAGUE, NL;MULLER, FRANK, NL-2623 NJ DELFT, NL;VAN RAVESTEIJN, ROBERTUS LAMBERTUS ADRIANUS, NL-2275 TB VOORBURG, NL |