SECURE APPARATUS TO PROVIDE SECURE VOICE TELEPHONY VIA A RIGIDLY ATTACHED MICROPHONE AND AN ACOUSTICALLY COUPLED EARPIECE
Original Publication Date: 1997-Sep-01
Included in the Prior Art Database: 2002-Jun-03
Secure Accessories provide Voice and Data Security to commercial Cellular Telephones by attaching externally to a Commercial-Off-The-Shelf cellular telephone, such as the MotorolaaMicroTAC Elitea cellular telephone. Control and Data are passed to the Cellular Telephone through the Accessory port located at the bottom of the telephone. When the Accessory enters the secure mode of operation, the audio from the Cellular accessory port is intercepted, on both transmit and receive sides, and is replaced with encrypted voice. The Cellular Telephone's internal Microphone and Earpiece are disabled when audio is routed in and out of the accessory port during Secure operation. Therefore, an additional Microphone and Earpiece must be provided by the Secure Accessoty to enable voice communication. The apparatus of Figure 1 provides for this external Microphone and Earpiece as shown. The Microphone is enclosed within the Secure Accessory, and the Earpiece is acoustically coupled to an internal speaker, as shown.