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AssigneeLucent Technologies Inc.
InventorsKeith Eugene Hollenbach, Donald Raymond Laturell, Steven Brooke Witmer
Estimating the term…
A method and apparatus to receive and demodulate call related information, e.g., Caller ID information, in an audio codec placed on the line side and powered by current drawn from the telephone line. The audio codec includes a 1st order Σ/Δ A/D converter to digitize the signal from the telephone line with Σ/Δ modulation. The 1st order Σ/Δ A/D converter may be a scaleable component capable of alternative operation in a 2nd order. The Σ/Δ encoded digitized signal is digitally processed by a DSP including an amplifier module, a digital filter, a limit/slice module, and an FSK decoder to receive and output the call related information. Placement of the audio codec on the line side and the scaleable Σ/Δ A/D converter provides significantly reduced power requirements for the audio codec, thus allowing operation from power derived from the telephone line. In another embodiment, to further reduce power consumption of the audio codec, the 1st order Σ/Δ A/D converter is sampled at a slower rate than is conventional, e.g., by first dividing or otherwise providing a slower sampling clock.
A device for receiving data from a telephone line in an on-hook condition, said device comprising:
A method of receiving information from a telephone line, said method comprising:
A scaleable codec for receiving information from a telephone line, said scaleable codec comprising:
A device for receiving data from a telephone line, said device being adapted and arranged to be powered from current drawn from said telephone line in an on-hook state, said device comprising:
A method of receiving data from a telephone line in an on-hook state, comprising:
Apparatus to receive data from a telephone line in an on-hook state, comprising:
Dependencies are inferred from the claim text.