Accession Number:

ADA289212

Title:

Distributrd Interactive Simulation Virtual Cassette Recorder (DIS VCR); A Datalogger with Variable Speed Replay.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

• Fortner, Jonathan L.

Report Date:

1994-12-01

Pagination or Media Count:

106.0

Abstract:

The overall objective of the Distributed Interactive Simulation Virtual Cassette Recorder DIS VCR is to add a flexible replay capability to any DIS environment and specifically to the Remote Debriefing Tool RDT. The DIS VCRs abilities include selective filtering of incoming DIS Protocol Data Units PDUs, variable-speed replays, ability to pause, fast-forward, rewind, efficient data storage and retrieval, and an interface that simplifies the execution of those functions. The thesis includes a DIS VCR-compatible design for concurrent replay of audio extracted from signal PDUs and an extension to the replay design that supports unmodifiable rendering or receiving applications. For variable-speed replays, we created a scalable simulation clock and a new PDU the Replay PDU. Applications modified for replays use the simulation clock to govern their dead reckoning algorithms while the DIS VCR uses it to control the timed release of stored PDUs. The Replay PDU communicates mode and speed changes between the DIS VCR and replay-modified applications. The DIS VCRs full functionality was successfully demonstrated at the 1994 AFA convention.

Descriptors:

• *DATA STORAGE SYSTEMS
• *CASSETTES
• VELOCITY
• ALGORITHMS
• SIMULATION
• CLOCKS
• EFFICIENCY
• THESES
• FILTERS
• DEAD RECKONING

Subject Categories:

• Recording and Playback Devices

Distribution Statement:

APPROVED FOR PUBLIC RELEASE