Method and circuit for analog to digital conversion of a noisy D

Details Method and circuit for analog to digital conversion of a noisy D Method and circuit for analog to digital conversion of a noisy D

1987-04-21

1988-02-16

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

358 36, H03M 120

Patent

active

047258144

ABSTRACT:
A steady or slowing changing analog signal affected with noise is sampled and held at the sampling rate of a following analog to digital converter and has a rectangular a.c. signal superimposed on it before it is supplied to the converter. This is done in such a way that when the analog signal is in the middle range between quantization steps, the least significant bit (LSB) is well defined. When the analog signal is close to a quantization threshold, the superimposed rectangular pulses change the LSB values back and forth and comparison of successive values is used to suppress changes in LSB value. On the other hand, if the analog signal is changing more rapidly through quantization steps, the circuit does not interfere with digital output changes. The system can be used during the vertical blanking intervals of a television signal for digitizing an analog voltage corresponding to a blending voltage for a video signal.

REFERENCES:
patent: 4183016 (1980-01-01), Sawagata
patent: 4334237 (1982-06-01), Reitmeier
patent: 4621254 (1986-11-01), Belcher

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