DEVICE FOR MASKING ELECTROMAGNETIC CHANNELS OF LEAKAGE OF SPEECH SIGNALS OF SOUND AMPLIFICATION EQUIPMENT Russian patent published in 2006 - IPC H04K3/00 H04M1/58 

FIELD: technology for creating artificial interference for masking speech information in industrial network of alternating current.

SUBSTANCE: device (dwg. 1) contains rectifier 2 and, connected serially, noise signal generator 4, noise signal power amplifier 5 and emitter 6, in noise signal amplifier 5, mode B or AB is implemented, between rectifier 2 and power chain of noise signal generator 4 and power amplifier of noise signal, impulse automatic-compensation voltage stabilizer 8 is inserted, at output of which upper frequency filter is mounted, lower cut frequency of which is higher than upper frequency of audible spectrum, but lower than clock frequency of impulse automatic-compensation voltage stabilizer 8.

EFFECT: increased protection of sound amplification equipment from possible electromagnetic leakage of sound information along power chains.

2 dwg