H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/15, 354/69
H04J 3/04 (2006.01) H03M 7/00 (2006.01) H04B 14/06 (2006.01) H04J 3/02 (2006.01)
Patent
CA 1037168
ABSTRACT OF THE DISCLOSURE A device is disclosed for converting an incoming analog signal into an outgoing PCM signal. The device includes a .DELTA. M- encoder in which a comparator circuit has a first and a second analog input of which the first analog input is arranged to be fed with the incoming signal. The comparator circuit includes a digital output adapted to supply a delta signal with a clock fre- quency considerably higher than the upper limit frequency of the incoming signal, a feedback filter for the delta signal being con- nected between the digital output and the second analog input of the comparator circuit. The device also includes a digital .DELTA. M- PCM converter in which a digital filter is connected to the digital output of the comparator circuit in the ? M-encoder and is arrang- ed to generate an average signal corresponding to the delta signal. A PCM word generator is connected in cascade with the digital filter and is adapted to generate the outgoing PCM signal with a sampling frequency considerably lower than the clock frequency.
216255
Na
Telefonaktiebolaget Lm Ericsson
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