Voice encodedecode subsystem in a system for acqu

专利名称：Voice encode/decode subsystem in a system

for acquisition of test data using pulse codemodulation

发明人：Daniel T. Laird申请号：US08/313972申请日：19940928公开号：US05557635A公开日：19960917

摘要：The encode and decode subsystems use a continuously variable slope delta-modulation (CVSD) approach, with either parallel or serial data transfers. To allow forsynchronization with a stable data transfer, the entire subsystem uses the mainacquisition systems bit rate clock (BRC) as a basis. All other clocks required are simplydivided down versions of the BRC and a request pulse from the main system to transferthe data. The delta-modulator is clocked at a rate commensurate with the wordplacement in the minor frame of the data acquisition cycle; the NRZ- L bits are clockedinto serial-to-parallel registers, then latched into the parallel discrete interface (PDI) unitof the main data system. For a serial feed, a similar situation is possible by clocking thedata off the circuit board into a serial discrete interface (SDI) unit. The request pulse thatactivates, the transfer is synchronized with the BRC to ensure a stable transfer. Thedecoder uses the same CVSD integrated circuit to decode the digital data. The decoder isable to lock onto the data stream as a parasitic extension of a standard PCM

decommutator. To locate the data and establish the necessary clocking, the standardword rate clock (WRC), frame rate clock (FRC), and the BRC of the decommutators are

used.

申请人：THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OFTHE AIR FORCE

代理人：Bernard E. Franz,Thomas L. Kundert

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