Signal quantizer with reduced output fluctuation

Details Signal quantizer with reduced output fluctuation Signal quantizer with reduced output fluctuation

1995-06-07

1996-10-22

Chin, Stephen

Pulse or digital communications

Pulse code modulation

Differential

375243, 348405, 395 239, H04B 1406

Patent

active

055685145

ABSTRACT:
A new signal quantization scheme is proposed which reduces fluctuation of the output signal by a signal quantizer (10) providing a quantized output signal and multiplying (18) said input signal X by a factor (1-w.sub.1)and finding a difference signal .DELTA..sub.in (11) between both the input signal and the previous input signal and multiplying (16) that by a weighting factor w.sub.2 from a control (13). The previous quantizer output signal Q.sub.prev is summed (17) with the weighted difference signal .DELTA..sub.in w.sub.2 and the sum is weighted by a weighting factor w.sub.1 at a multiplier (19) to yield w.sub.1 (Q.sub.prev +w.sub.2 .DELTA..sub.in). This signal is then summed at an adder (21) and applied to the quantizer (10) so that the quantizer is forced to match the fluctuation in the input signal as well as the signal itself. When applied to speech encoding algorithms such as the North American digital cellular telephone standard VSELP, the new quantizer results in more natural sounding background noise.

REFERENCES:
patent: 4817157 (1989-03-01), Gerson
patent: 5233660 (1993-08-01), Chen

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