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function [ STOPS ] = make_stops(Lh,SYMBOLS)
%
% MAKE_STOPS:
% This code returns a statenumber corresponding to the set of
% legal stop states as found from Lh. The method is to use the table
% of symbolic stop states as it is listed in the report made
% by 95gr870T. For the table lookups are made in SYMBOLS. in
% order to map from the symbol representation to the state number
% representation.
%
% SYNTAX: [ STOPS ] = make_stops(Lh,SYMBOLS)
%
% INPUT: SYMBOLS: The table of symbols corresponding the the state-
% numbers.
% Lh: Length of the estimated impulseresponse.
%
% OUTPUT: STOPS: The number representation of the set of legal stop
% states.
%
% SUB_FUNC: None
%
% WARNINGS: The table of symbolic representations has not been verified
% but is used directly as it is listed in the report made
% by 95gr870T.
%
% TEST(S): The function has been verified to return a state number
% which matches the symbolic representation.
%
% AUTOR: Jan H. Mikkelsen / Arne Norre Ekstrøm
% EMAIL: hmi@kom.auc.dk / aneks@kom.auc.dk
%
% $Id: make_stops.m,v 1.2 1997/09/22 11:44:21 aneks Exp $
% OBTAIN THE SYMBOLS FROM Lh. THIS IS THE TABLE LISTED IN THE REPORT MADE
% BY 95gr870T. (SATEREPRESENTATION IS SLIGHTLY CHANGED).
%
if Lh==1,
stop_symbols = [ -1 ];
count=1;
elseif Lh==2,
stop_symbols = [ -1 j ];
count=1;
elseif Lh==3,
stop_symbols = [ -1 j 1 ];
count=1;
elseif Lh==4,
stop_symbols = [ [ -1 j 1 j ] ; [ -1 j 1 -j ] ];
count=2;
elseif Lh==5,
stop_symbols = [ [ -1 j 1 j -1] ; [ -1 j 1 -j -1] ; [ -1 j 1 j 1] ; [ -1 j 1 -j 1] ];
count=2;
else
fprintf('\n\nError: Illegal value of Lh, terminating...');
end
% NOW THAT WE HAVE THE SYMBOL REPRESENTATION THE REMAINING JOB IS
% TO MAP THE MSK SYMBOLS TO STATE NUMBERS
%
index = 0;
stops_found=0;
while stops_found < count,
index=index+1;
if sum(SYMBOLS(index,:)==stop_symbols(stops_found+1,:))==Lh,
stops_found=stops_found+1;
STOPS(stops_found)=index;
end
end
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