Telegraphy – Systems – Printing
Patent
1974-12-05
1976-06-08
Safourek, Benedict V.
Telegraphy
Systems
Printing
178 68, H03K 1322
Patent
active
039626369
ABSTRACT:
The invention relates to a device for converting an incoming analog signal into an outgoing PCM signal, comprising 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 and a digital output arranged to supply a delta signal with a clock frequency considerably higher than the upper limit frequency of the incoming signal and in which a feedback filter for the delta signal is connected between the digital output and the second analog input of the comparator circuit, and a digital .DELTA. M-PCM converter in which a digital filter is connected to the digital output of the comparator circuit in the .DELTA. M-encoder and is arranged to generate an average signal related to the delta signal and a PCM word generator is connected in cascade with the digital filter and is arranged to generate the outgoing PCM signal with a sampling frequency considerably lower than the clock frequency.
REFERENCES:
patent: 3710056 (1973-01-01), Tomozawa
patent: 3822404 (1974-07-01), Crossier et al.
patent: 3825831 (1974-07-01), Ishiguro
Safourek Benedict V.
Telefonaktiebolaget L M Ericsson
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