Motorola Corporation

William Chun-Hung Yip

Timothy Gerard Hall

Paul R Kennedy

Craig R Balogh

A system (,) transmits a digital data stream (,) using a lossy compression service (,) having a communication path (,) through which compressed signals propagate. The system includes a data conditioner (,) configured to condition the received digital data stream (,) to produce data subsets (,). A frame generator (,) expands each of the data subsets (,) to generate distinct signal sets (,). The distinct signal sets (,) are expressed in a data size greater than the data subsets (,) to compensate for lossy compression cause by the lossy compression service (,). A transmitter is in communication with the frame generator (,) and transmits digitized ones of the distinct signal sets (,) in frames of a digital bit stream (,) over the communication path (,).

Method and system for data transmission using a lossy compression service

A secure communications system (501) including a local digital terminal (510) coupled to an interworking function (538). The interworking function (538) couples the digital radio network (121) to a PSTN (542, 546, 548) and a remote analog communication terminal (552). The system (501) includes a novel method of establishing an end-to-end communication channel between local digital (510) and remote analog (552) terminals wherein the local digital terminal establishes (510) a direct digital channel (121) between itself (510) and the interworking function (538) and transmits a message describing its signaling capabilities to the interworking function (538). The interworking function (538) then trains its modem with the modem of the remote analog terminal (552) such that signaling capabilities of the local digital terminal (510) and the remote analog terminal (552) are not violated. By moving modem training procedures to the interworking function (538), signal processing delays in the local digital terminal (510) do not adversely affect the success of establishing the end-to-end communication channel.

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Phoenix, AZ, United States of America

William Chun-Hung Yip