Spurious ting suppression device particularly for auxiliary ringers in socket telephone systems

摘要

An acoustic feedback suppression system, particularly for auxiliary ringers in socket telephone systems, comprising a first terminal (L1) and a second terminal (L2) of a telephone line, an internal ringer (9), and an auxiliary ringer (50) that is connected between said first and said second telephone lines; the particularity of the system is that it comprises activation means (12, 13) adapted to activate first (15) and second (16) switching means that reduce the voltage at the terminals of the auxiliary ringer (50), the activation means (12, 13) being controlled by an activation signal (14) generated by call, control, and signalling means (2) when a user dials a telephone number.