function [C,desc] = get_F0_rule_conditions_frame(F);
%
%  [C,desc] = get_F0_rule_conditions_frame(F);
%
%  Calculate fundamental frequency rule conditions 'C' of sentences 
%  given as phonological structure 'F'. The output argument 'desc' 
%  contains a description of each rule condition.
%  
%  Elements of 'F':   F.sentence_number
%                     F.syllable_number
%                     F.syllable_size 
%                     F.phone_number 
%                     F.phone_position 
%                     F.phone_id 
%                     F.accent
%                     F.phrase_type 
%                     F.phrase_boundary
%                     F.phrase_size
% 


%===== mittlere Grundfrequenz =====

                                   % find indices of all syllable nuclei
nucleusIndexes = find(phone_has_properties(F,'nucleus')); 
C = ones(size(nucleusIndexes,1),1);
desc{1} = ['mittlere Grundfrequenz'];


%===== Position der Silbe in der Phrase =====


%===== Phrasentyp ===== 


%===== Staerke des Silbenakzents =====


%===== Lautliche Eigenschaften der Silbe ======



