On measuring frequency variations

The major proposals for the measurement of frequency variations are discussed. It is shown that the measurement of peak value offers considerable practical advantages over an rms measurement. A curve is shown of the subjective evaluation of flutter as a function of flutter frequency; this curve is a compromise between several proposals. These proposals have now been adopted nationally in Germany and the U.S.A., internationally by the International Radio Consultative Committee (CCIR), and are under consideration by the International Electrotechnical Commission (IEC).