A NEW FAMILY OF LOW OVERHEAD ERROR REDISTRIBUTING (LOER) CODING TECHNIQUES WILL BE EXPLORED.

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$49,680.00
Award Year:
1984
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
1788
Agency Tracking Number:
1788
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
3410 Central Expressway, Santa Clara, CA, 95051
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
LON RADIN
INVESTIGATOR
() -
Business Contact:
() -
Research Institute:
n/a
Abstract
A NEW FAMILY OF LOW OVERHEAD ERROR REDISTRIBUTING (LOER) CODING TECHNIQUES WILL BE EXPLORED. CODES IN THIS FAMILY INTRODUCE A SMALL BIT ERROR RATE BUT CONCENTRATE THE TRANSMISSION BIT ERRORS ON SOME OF THE BITS WHILE SHIELDING CERTAIN OTHER BITS. THIS LOER CODING TECHNIQUE IS COMBINED WITH A DATA QUALITY INDICATOR (DQI) SIGNAL FROM THE MODEM TO YIELD AN ALGORITHM FOR TRANSMISSION OF LINEAR PREDICTIVE CODING (LPC) SPEECH OVER FADING MOBILE SATELLITE CHANNELS. THIS ALGORITHM USES LOER CODING TO MINIMIZE THE EFFECT OF BIT ERRORS AND THE DQI SIGNAL TO TRIGGER INTER-FRAME SMOOTHING OF LPC MODEL PARAMETERS. THE LOER CODING SCHEME IS IMPLEMENTED IN A REAL TIME VOICE DIGITIZER. THE DQI SIGNAL IS IMPLEMENTED IN A MOBILE SATELLITE MODEM. THESE DEVICES ARE INTERFACED AND THE OVERALL EFFECT OF THE ERROR PROTECTION ALGORITHMS IS MEASURED IN ACTUAL LISTENING TESTS.

* information listed above is at the time of submission.

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