Accession Number : ADA314629

Title :   Short Segment Data Base.

Descriptive Note : Final rept. Apr-Aug 96,

Corporate Author : NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA

Personal Author(s) : Lay, R.

PDF Url : ADA314629

Report Date : AUG 1996

Pagination or Media Count : 29

Abstract : The objective of this project was to construct the Short Segment Data Base, a data base of short speech segments with various dwell times and various periods. This was accomplished by switching a receiver back and forth between an occupied and an unoccupied frequency. There must be no audio signal present when the receiver is tuned to the unoccupied frequency. This switching technique simulates a scanning receiver recording the audio on a specified frequency during each scan cycle. These audio segments are recorded on one channel of a digital audio tape (DAT) deck. The original, nonsegmented audio is recorded on the other channel. A Short Segment Data Base has been developed, with dwell times of 4, 8, 16, 32, 64, 128, and 256 ms. For each dwell time, the number of frequencies scanned per scan cycle (simulated) was 5, 10, and 20 frequencies. The data base was recorded on 14 DAT tapes. Part one of the Short Segment Data Base consists of seven DAT tapes, and is derived from the KING data base. The second part, consisting of the remaining seven DAT tapes, is derived from the TIMIT data base. Of the seven DAT tapes in each part, there is one for each dwell time.

Descriptors :   *DATA BASES, *SYSTEMS ENGINEERING, *SPEECH, *AUDIO TAPES, SCANNING, DIGITAL SYSTEMS, VALIDATION, CYCLES, SHORT RANGE(TIME), CONSTRUCTION, CONFIGURATIONS, RECEIVERS, ACOUSTIC SIGNALS, RECORDING SYSTEMS, CHARTS, SWITCHING, CHANNELS, DWELL TIME, MAGNETIC TAPE.

Subject Categories : Computer Systems
      Recording and Playback Devices
      Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE