| 摘要 |
A system for digitally quantizing, at high resolution, relatively small variations of an analog input signal. Initially, a reference level signal having a preselected value close to the average magnitude of the analog signal being quantized is compared with the analog input signal. The difference between these two signals is amplified and then analog to digital converted. By an iterative process, the reference level is adjusted as necessary to closely track the gross magnitude level of the analog input signal. Analog to digital conversion is applied only to the small difference signal, thereby allowing quantization to occur with high resolution. The system automatically keeps track of gross signal excursions so that the magnitude of the quantized signals is also available to the user.
|
