Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1978-06-02
1981-02-17
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
340347AD, H03K 1302
Patent
active
042518032
ABSTRACT:
Disclosed is a dynamic compensation circuit for correcting the residual offset voltage encountered in an analog-to-digital conversion chain. Samples of an analog signal having an average value equal to 0 are provided to a first input of a comparator, the second input of which receives a reference signal generated through a D to A converter under control of a control logic circuit. A sample and hold circuit with the comparator causes a DC offset of the output signal level which is to be dynamically corrected by the compensating circuit of the invention. The DC offset causes the duty cycle to differ from one by an amount .DELTA.DC which will be the error curve signal of the compensation circuit. The compensating circuit reduces the .DELTA.DC to 0 by adding to the signal a DC voltage opposite to and of equal magnitude to the offset voltage level.
REFERENCES:
patent: 3105230 (1963-09-01), MacIntyre
patent: 3582784 (1971-06-01), Gaunt
patent: 3746990 (1973-07-01), Le Diberder
patent: 3761841 (1973-09-01), Jacquart
patent: 3893103 (1975-07-01), Prill
patent: 3953805 (1976-04-01), Couvillon
patent: 4034366 (1977-07-01), Memishian
Debord Pierre
Marijon Jean-Louis
Duffield Edward H.
International Business Machines - Corporation
Miller Charles D.
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