Development of a standard measurement to predict subjective flutter

The old IEEE/ANSI flutter measurement standard did not predict subjective flutter; it also failed to specify several important characteristics of the meter. Comerci proposed a "flutter index" method but it was never adopted. Results of several workers were incorporated in 1962 in a German Standard (DIN) Weighted Peak Flutter measurement. The NAB flutter measurement of 1965 incorporates the frequency weighting of the DIN Standard, and the volume indicator of Comerci. CCIR adopted the DIN method in 1966. Experiments in the U.S.A. comparing the DIN and NAB methods showed the DIN method to be more satisfactory, and this method is incorporated in the new IEEE Standard 193-1971, based on an IEC draft. Circuits to achieve the desired time and frequency responses are given, as well as suppliers of commercial flutter meters and test records to the new standard.