Call related information reception using sigma/delta modulation

摘要: Apparatus for receiving and demodulating call related information, e.g., Caller ID includes an audio codec (104) placed on the line side powered by current drawn from telephone line. The a 1st order Σ/Δ A/D converter (140) to digitize signal with modulation. may be scaleable component capable of alternative operation in 2nd order. encoded digitized is digitally processed DSP (110) including amplifier module, digital filter, limit/slice FSK decoder receive output information. Placement provides significantly reduced power requirements codec, thus allowing derived In another embodiment, further reduce consumption sampled at slower rate than conventional, first dividing or otherwise providing sampling clock.