Nokia Mobile Phones Limited

Samuli Pietil&auml;

Jari Syrj&auml;rinne

Ari Heikkinen

Vesa T Ruoppila

A method and apparatus for coding successive pitch periods of a speech signal. Based on a priori knowledge of statistical properties of successive speech periods, a shaped lattice structure is designed to cover the most probable points in the pitch space. The codebook index search starts with finding an open-loop estimate in the pitch space considering all dimensions and refining the open-loop estimate in a closed-loop search separately in each dimension based on the shaped lattice structure. The closed-loop search for the first subframe is for obtaining an absolute pitch period or a delta pitch while the closed-loop search for each of the other subframes is for obtaining a delta pitch for the respective subframe.

Method and apparatus for coding successive pitch periods in speech signal

The present invention relates to a method for selecting satellites (SV -SV ) to be used for positioning in a positioning system. The positioning system comprises information on the orbits of the satellites (SV -SV ). In the method, at least one satellite (SV -SV ) to be searched for is selected at a time, and a searching step is performed to find out if the signal transmitted by at least one selected satellite (SV -SV ) can be received. In the method, at least a first searching step and at least one continued selection step are performed, wherein in the continued selection step, at least one satellite (SV -SV ) is selected at least partly on the basis of the findings of the previous searching step. The selection step is followed by the satellite searching step.

Growing community of inventors

Tampere, Finland

Samuli Pietilä

Growing community of inventors

Tampere, Finland

Samuli Pietil&auml;

Samuli Pietilä