Pulse or digital communications – Repeaters – Testing
Patent
1986-03-28
1988-04-05
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
340347C, H04B 1404
Patent
active
047363878
ABSTRACT:
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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Chin Stephen
Griffin Robert L.
GTE Laboratories Incorporated
Keay David M.
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