| 摘要 |
PURPOSE:To reduce the quantizing distortion by giving the quantization to the information signals by dividing them into several units of level quantum groups featuring the quantization level shift. CONSTITUTION:Waveforms 3 and 4 of signals 1 and 2 are led into quantizers 5 and 5' and then quantized at quantization levels 15 and 16 to be led to coders 6 and 7. In this case, levels 15 and 16 shift by about 1/2 quantum to each other. The signals encoded through encoders 5 and 6 are led to decoders 9 and 10 via track 8 of the memory unit or the transmission line. Decoders 9 and 10 restore the shift of the quanta of the encoded signals for demodulation. The demodulated signal is then regenerated to the original information signal or its related signal through compounder 11. Thus the quantization levels are shifted when the information signal is quantized, and as a result the quantizing distortion of nearly one bit can be reduced. |
