Error reduction in conversion of analog quantities to digitized time intervals

Conclusions

1. It is possible to reduce the systematic errors in analog-time-digital conversion if additional parallel conversion channel is used for a reference quantity comparable with the input. 2. Coincidence between regular pulse trains enables one to eliminate the quantization error (in the usual sense) from the conversion result. One uses as quantization step not the quantization period but the length of the quantizing pulses. 3. This coincidence method allows one to raise the frequency of the scan function considerably, while greatly improving the linearity and reducing the level quantization frequency. 4. This analog-to-digital converter with parallel systematic-error elimination using coincidence can be used to advantage not only in instruments such as voltmeters, frequency meters, and so on, but also in complex multichannel data systems linked to computer processing.