Telephone interface circuit

Abstract

Abstract The present invention relates to a telephone interface circuit, unconnected to a power source, disposed on a telephone line (L1, L2) connected to at least one connector (1, 2) which can be connected to a telephone set, this circuit being connected to various terminals, and comprising first means (10) of ringing-signal detection, second means (32) of line seizure to seize the line once the ringing signal has been detected for a specified period, and third means (12) of temporisation, selection and switching. Each connector of this circuit is connected directly to the line, connected up in order to disable the ringing of the corresponding telephone set and associated with a sound transducer (21, 22) connected to the said third means and which can be actuated by a signal under low voltage. <IMAGE>

Inventors

• 👤 Christian Dupillier

Bibliographic Details