Abstract: An electrical circuit has, for measuring the frequency of laser Doppler signals, at least one counter for counting the signal pulses and a microprocessor for evaluating the counter reading which is produced within a measuring interval. A high degree of accuracy in the frequency measurement of laser Doppler signals is achieved, in that for controlling the pulse count a blocking element, such as an And-gate (2), which is controlled by means of an additional signal, for example by an automatic band pass, is connected in series with the laser signal pulse counter (4), and also in that there is arranged a time pulse counter (7) which is connected for example to a quartz pulse generator (8) and determines the measuring interval by means of a predetermined number of pulses, and finally in that the laser signal pulse counter (4) and the time pulse counter (7) are connected to a microprocessor (14) for reading the counter readings on completion of a measuring interval.