| 摘要 |
Quantizing apparatus for producing binary quantized values of increasingly closer approximation to a real-valued signal being quantized. A look-up table of threshold values are stored in a memory which is addressed by a shift register. A comparator compares a selected threshold value from the memory with the real-valued signal and produces a bit depending on which is greater. The bit is entered in the shift register causing an appropriate threshold value to be selected for the next comparison cycle with the real-valued signal. Over successive cycles the accumulated bits provide a quantized representation of the real-valued signal of increasing precision. The bits are dequantized to provide a reconstructed value by dequantizing apparatus having a memory containing a look-up table of reconstructed values. The memory is addressed by a shift register which accumulates the bits as they are received. A more precise reconstructed value is produced by the memory as the contents of the shift register accumulates more bits.
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