Abstract: An apparatus for testing a device including a plurality of elements each having contact surface and a non-contact surface, the apparatus comprising a base for holding the device, the base having a contact surface engageable with the contact surface of each element, an actuator, a plurality of compliant members carried by the actuator to engage the non-contact surface of each element, each compliant member further including an aspect ratio of at least 1:1, and means for exerting a force against the actuator, the aspect ratio for allowing the compliant members to compensate for physical variations of the elements, provide compliance between the apparatus and the elements and substantial coplanarity between the contact surface of each element and the contact surface of the base while allowing a sufficient focusing of force by the compliant members against the non-contact surface of each element to provide contact between the contact surface of each element and the contact surface of the base without damaging the

Abstract: A system and method are disclosed for preventing intelligible interception of information signals transmitted over a two-direction line. A masking signal is applied through a hybrid circuit at the receiving end of the line, and this masking signal, which appears on the line together with the information signal, prevents intelligible decoding. Only at the receiving end of the line, where the hybrid circuit attenuates the masking signal which it receives at its receive port, can intelligible decoding take place. Signal processing techniques used at the receiving end permit larger amplitude masking signals to be used, thus creating even greater confusion for an unauthorized detecting mechanism which is coupled to the line.

Abstract: A technique for inhibiting intelligible interception of information signals transmitted over a line from a first site to a second site. A masking signal is applied to the line immediately upon the detection of the information signal at the second site, but prior to the time at which the validity of the signal is verified. As long as the information signal remains on the transmission line, the masking signal is repeatedly turned on and off to thereby inhibit decoding of the signal by an eavesdropping device.

Abstract: A system and method are disclosed for preventing intelligible interception of information signals transmitted over a two-direction line. A masking signal is applied through a hybrid circuit at the receiving end of the line, and this masking signal, which appears on the line together with the information signal, prevents intelligible decoding. The masking signal includes a series of frequencies which are sequentially applied. Only at the receiving end of the line, where the hybrid circuit attenuates the masking signal which it receives at its receive port, can intelligible decoding take place. The amplitude of the information signals is sensed at the receiving end and the amplitude of the masking signals on the line is adjusted to be great enough to provide security, by confusing an eavesdropping detector, yet small enough at the receiving end so that the receiving detector is not confused.

Abstract: A message storage system (104) deletes trailing silence from messages stored therein. Voice messages are converted to digital signals and stored as data blocks in a digital storage system (114a). Voice signals are detected in messages to be stored and voice present bits are generated and included in the individual data blocks to indicate whether voice signals are present in the data blocks. During storage of the data blocks, the voice present bits which identify data blocks containing no voice signals increment a counter (311), and voice present bits which identify data blocks containing voice signals clear the counter (311). The final count in the counter is representative of the trailing data blocks which do not contain voice signals, i.e., silence, and these data blocks are deleted from the digital storage system.