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devices for implementing a pcm encoded input signal in a pulsdichtemoduliertes output and application of this decodierers in a digital analog converter
devices for implementing a pcm encoded input signal in a pulsdichtemoduliertes output and application of this decodierers in a digital analog converter
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机译:用于在脉冲二分调制器输出中实现pcm编码输入信号的设备,以及该分频器在数字模拟转换器中的应用
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摘要
A decoder for converting a linear p.c.m. input at a pulse density modulated (p.d.m.) sampling rate to a sigma-delta type p.d.m. binary stream, which can be demodulated by a simple R.C. filter, or otherwise, provides an analogue output as in a digital-to-analogue converter if required. The decoder basically comprises first and second recursive filters (F', G'), the output of the first (F') being applied to the input of the second (G'), which in turn outputs to digital comparator (13). Depending on the output of the comparator, a signal Q' has one of two values and is applied wholly or proportionally to the first recursive filter (F') and proportionally (as P') to the second recursive filter (G'). Each recursive filter comprises a respective multiplier (21, 22) and a respective storage register (11, 12) clocked at the same clock rate (fc), and with an input comprised by a respective adder (9, 10). Other circuit configurations (Figs. 3 to 7) conforming to the same simulation formulae as Fig. 8 are described. IMAGE
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