This paper presents an automatic gain control circuit in which the time constant varies continuously and automatically. Its physical process is first explained

and then its transient state and stable state are analysed. Finally it is pointed out that the system is a generalization of the general automatic gain control circuit in which the time constant is fixed. Not only can the system suppress high level interference pulse and its output dynamic range

but also ensure a sufficiently low countermodulation distortion of useful signal at low level.An additional device is chiefly made up of the automatic gain control system of varying time constant. Connecting the device with the terminal of the short wave receiving equipment EKV-12

Berlin

1975

it can lower error code rate by and raise signal-noise ratio by 10 dB with respect to the EKV-12.