Telephone call recognition circuit for mobile telephone has connections to contact metallic surfaces of card reader for evaluation of card

摘要

The recognition circuit (31) evaluates electromagnetic waves, which are emitted by the radiotelephone when a connection is set-up or in operation. The recognition circuit is provided on a card-shaped carrier, and has connections (311,314,315,318) to contact surfaces (321,324,325,328) of a card reader (2) for evaluation of a card, e.g. key-card. An Independent claim is also provided for an audio reproduction unit (1) with a device for muting the audio reproduction when a telephone call is received.