circuit_logic(cur_State,n,m)

function [o,next_State] = circuit_logic(cur_State,n,m)
%Function:  This defines the circuit logic for a specific convolution
%           encoder.  For now, I hand code the n outputs, but this can be
%           easily done automatically via the generator impulse responses.

%cur_State - The current state of the filter
%n         - number of output words [y(1),y(2),...,y(n)]
%m         - number of memory elements

%Define output (n bit) in terms of states
y{1} = mod(cur_State.in + cur_State.m{2} + cur_State.m{3},2);
y{2} = mod(cur_State.in + cur_State.m{1} + cur_State.m{3},2);
y{3} = mod(cur_State.in + cur_State.m{1} + cur_State.m{2} + cur_State.m{3},2);

%Initialize Output Word
o = zeros(1,n*length(y{1}));
for i = 0:n-1; o(1+i:n:end) = y{i+1}; end
o(o==0) = -1;
next_State.st = 0;

%Convert binary vec to state value, and Update State.
for i = 0:m-1
    if(i+1==1); next_State.m{i+1} = cur_State.in;
    else;       next_State.m{i+1} = cur_State.m{i};
    end
    next_State.st = next_State.st+ (2^i)*next_State.m{i+1};
end
next_State.st = next_State.st+1;
end