Analog-to-digital conversion apparatus including a circuit to su

Details Analog-to-digital conversion apparatus including a circuit to su Analog-to-digital conversion apparatus including a circuit to su

1983-10-17

1985-12-31

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358141, 340347AD, H03K 13175

Patent

active

045624569

ABSTRACT:
The quantizing resolution of an analog-to-digital converter is effectively enhanced for sinusoidal input signals by (a) sampling the signal at 90 degree intervals of the sinusoid; (b) establishing the input range of the converter to be less than the dynamic range of the signal but arranged so that at least three of four successive samples are true or correct values; (c) detecting the occurrence of saturated fourth sample values; (d) calculating correct values for saturated sample values from preceding samples; and (e) substituting calculated values for saturated incorrect values.

REFERENCES:
patent: 3027079 (1962-03-01), Fletcher et al.
patent: 3699325 (1972-10-01), Montgomery, Jr. et al.
patent: 3930256 (1975-12-01), Amemiya
patent: 3967269 (1976-06-01), Fletcher
patent: 3981006 (1976-09-01), Takayama et al.
patent: 4244004 (1981-01-01), Yamada
patent: 4251802 (1981-02-01), Horna
patent: 4308524 (1981-12-01), Harrison et al.
A. R. Balaban, U.S. patent application Ser. No. 443,929, filed 11/23/82, entitled "Digital Television Receiver With Analog-to-Digital Converter Having Time Multiplexed Gain".
J. F. Schanne, U.S. patent application Ser. No. 316,658, filed 10/30/81, entitled "Adaptive Analog-to-Digital Converter System".

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