H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/71, 379/9
H03M 1/00 (2006.01) H04M 3/56 (2006.01)
Patent
CA 1235541
METHOD AND APPARATUS FOR OPERATING ON COMPANDED PCM VOICE DATA ABSTRACT A method and apparatus for digitizing audio signals being generated from a plurality of parties (A,B) in order to provide audio communication between the parties with a minimum of interference. Each of the parties has an audio transmitter and receiver (38,58). The audio signals are converted (42) to a PCM companded signal for transmission to a rmote location, and there con- verted (46) to an eight-bit parallel signal. A pre- programmed ROM (48) is located at the remote location and has a plurality of inputs and outputs. Each of the eight-bit parallel signals from the individual parties are fed to the ROM which produces an eight-bit output signal representing the instantaneous sum of the eight- bit parallel signals being supplied to its inputs. The ROM output is converted to a serial-digital signal by a parallel-to-serial converter (50) for transmission over a single line (52) to another serial-to-parallel converter (54) prior to being fed through a DAC to the receiver (58).
487815
Meredith & Finlayson
National Aeronautics And Space Administration
LandOfFree
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