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EP0098744A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Improvements in analog to digital converters

Assignee: Pitney Bowes Document Messaging Technologies Ltd
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Filing: 1983-06-30
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Granted: —
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Expires: 2003-06-30
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Abstract

Abstract An analog to digital converter apparatus arranged to convert a plurality C (= 4) of different input signals to digital representations therof. The apparatus comprises a multiplexer arranged sequentially to couple each of the 4 input signals to a fast a-to-d converter (such as a successive approximations converter) at a rate such that each input signal is coupled N (= 8) times in a period M (= 20m secs) of an a.c. series mode interfacing signal (at 50 Hz) and at equal time intervals M/N (20/8 = 2.5m secs). The N (= 8) digital values of each input signal are averaged to provide at the end of a conversion period a digital value for each of the 4 input signals (C) which is the mean magnitude of the signal during the 20m sec period (M).

Inventors

  • 👤 Desmond Wheable
  • 👤 Michael John Attwood

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 00:39
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/1205; H03M1/34; H03M1/38

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 118 words
An analog to digital converter apparatus for converting analog input signals coupled to a plurality C of inputs to digital representations thereof, characterised in that it comprises means (14) arranged sequentially to couple the C inputs (11) to a fast analog to digital converter (22) at a rate such that each input (11) is coupled to the converter (22) N times in a period M of an a.c. series mode signal and at equal time intervals of M/N, averaging means (24, 16) for averaging the N digital values of each input to provide at the end of a conversion period C digital signals representative of the mean magnitude of the C input signals respectively during a period M.
Claim 2
Dependent Claim 118 words
An analog to digital converter apparatus for converting analog input signals coupled to a plurality C of inputs to digital representations thereof, characterised in that it comprises means (14) arranged sequentially to couple the C inputs (11) to a fast analog to digital converter (22) at a rate such that each input (11) is coupled to the converter (22) N times in a period M of an a.c. series mode signal and at equal time intervals of M/N, averaging means (24, 16) for averaging the N digital values of each input to provide at the end of a conversion period C digital signals representative of the mean magnitude of the C input signals respectively during a period M.
Claim 3
Dependent Claim 14 words
Apparatus according to claim 1, characterised in that the converter is a successive-approximations converter.
Claim 4
Dependent Claim 50 words
Apparatus according to claim 1 or 2, characterised in that the averaging means comprises storage means for storing the individual digital signals at predetermined addresses, means for summing the N samples of each input in sequence and for dividing the sum signal by N to provide the said digital representation.
Claim 5
Dependent Claim 27 words
Apparatus according to claims 1, 2 or 3 characterised in that N is a value 2 x where x is an integer thereby to facilitate the averaging.
Claim 6
Dependent Claim 35 words
Apparatus according to claims 1, 2, 3 or 4, characterised in that N is 8 and division by 8 is effected by storing the digital number in a shift register and shifting it three places.

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