1
Paul Callens, Claude Galand, Claude Gergaud, Philippe Noailly, Pierre Secondo: Method and system for transmitting digitized voice signals as packets of bits. International Business Machines, John B Frisone, December 16, 1986: US04630262 (212 worldwide citation)

A method of transmitting digitized voice signals as packets of bits in a digital transmission network to which a plurality of terminals acting as sources of voice signals are attached. The method includes, at the transmitting end and for each source, the steps of: a dividing the signal into successi ...


2
Paul Callens, Claude Galand, Guy Platel, Robert Vermot Gauchy: Method of reconstructing lost data in a digital voice transmission system and transmission system using said method. International Business Machines, John B Frisone, March 6, 1990: US04907277 (82 worldwide citation)

A method of reconstructing, at the receiving end, digital data defining an encoded voice signal segment lost in transmission between the transmitter and the receiver in a transmission system wherein a low-frequency signal such as a residual baseband signal is derived at the transmitting end from the ...


3
Paul Callens, Claude Galand: Multirate digital transmission method and device for implementing said method. International Business Machines Corporation, John B Frisone, December 6, 1988: US04790015 (23 worldwide citation)

This coder dispatches the bits resulting from the coding operation of a speech signal into a format for transmission at a rate chosen from a plurality of predetermined transmission rates. More specifically, the contents of at least part of the speech signal frequency bandwidth is split into several ...