Method and apparatus for error reduction in digital information

Details Method and apparatus for error reduction in digital information Method and apparatus for error reduction in digital information

1975-04-16

1976-12-21

Griffin, Robert L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

325 65, 340347AD, H04B 100

Patent

active

039991296

ABSTRACT:
A method and apparatus for reducing idle channel noise, cross talk and quantizing error noise in a digital information transmission system designed for operation over a predetermined frequency spectrum and having an analog-to-digital converter, an information transmission medium, and a digital-to-analog converter all located between a transmitting station and a receiving station. A controlled noise signal having an amplitude lying in the range from about 1/4 to 1/2 of the magnitude of a quantizing interval of the ADC and DAC and a frequency content concentrated at (n+1/2) times the ADC and DAC sampling frequency but outside the system frequency spectrum is added to the analog information input signals prior to conversion to digital form. The injected controlled noise signal predominates whenever the amplitude of spurious noise signals is less than the amplitude of the controlled noise signal and the level of the input to the ADC is near a quantizing interval transition point so that the subsequent analog output signals from the DAC have frequencies concentrated outside the frequency spectrum of the system. The DAC output signals are subsequently filtered by a post sampling filter having a pass band coextensive with the system frequency spectrum so that the controlled noise signal components are removed before coupling to the receiving station.

REFERENCES:
patent: 3244808 (1966-04-01), Roberts
patent: 3562420 (1971-02-01), Thompson
patent: 3614622 (1971-10-01), Holsinger
patent: 3656152 (1972-04-01), Gundersen
patent: 3877022 (1975-04-01), Lehman et al.
patent: 3881097 (1975-04-01), Lehmann et al.
"Dithering Increases Dynamic Range and Improves Linearity", Federal Scientific Corporation, Aug. 24, 1973; pp. 1-8.

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