H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/72
H04L 1/00 (2006.01) H03M 3/02 (2006.01) H04B 14/04 (2006.01)
Patent
CA 1178679
PHN. 9970 13 ABSTRACT: A system for the quantization of signals compris- ing in a transmitter section (IR) quantizing means (KW), a difference producer (DF1) and filter means (G1, H1). An in- put signal (X) and a quantized output signal (Y) which is derived from the quantizing means and acts as a feedback signal are applied to the difference producer. The output signal of the difference producer is applied by a network (G1) to the quantizing means having for its object to quan- tize the level of the filtered output signal of the differ- ence producer. Filter means (G1) are connected into the path of the input signal for relatively influencing the spectrum of the quantizing noise. When digital signals are used the indispensable D/A-converters form a source of noise owing to threshold inaccuracy. Here, the quantizing means (KW) are arranged to provide a second quantized output sig- nal (V). In the receiver section RC a first recevied signal (Y') is applied to a first network (H1') and a second received signal (V') is applied to a second network (1/G1'). The output signals of the two networks are combined to one output signal. The number of quantizing levels of the feed- back signal (Y) may in principle amount to two, in which case the relevant D/A-converter is free from noise caused by threshold inaccuracy.
398108
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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