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% remove internal fields irrelevant to external usage
function output = clean_filter_fields(input)
output = input;
fields_to_remove = {...
    'Hanalog' 'Apass_actual' 'Astop_actual' 'delay' 'grpdelayvar'...
    'Hd1' 'Hd2' 'Hmiddle' 'a1' 'b1' 'a2' 'b2'};

for i = 1:length(fields_to_remove)
    field = char(fields_to_remove(i));
    if isfield(output, field)
        output = rmfield(output, field);
    end
end