GB1187868A - Improvements in Digital Counters. - Google Patents

Improvements in Digital Counters.

Info

Publication number
GB1187868A
GB1187868A GB5290867A GB5290867A GB1187868A GB 1187868 A GB1187868 A GB 1187868A GB 5290867 A GB5290867 A GB 5290867A GB 5290867 A GB5290867 A GB 5290867A GB 1187868 A GB1187868 A GB 1187868A
Authority
GB
United Kingdom
Prior art keywords
stage
change
cell
state
gate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB5290867A
Inventor
Marie Alphonse Paul Diederich
Norman Darwood
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Decca Ltd
Original Assignee
Decca Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Decca Ltd filed Critical Decca Ltd
Priority to GB5290867A priority Critical patent/GB1187868A/en
Publication of GB1187868A publication Critical patent/GB1187868A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
    • H03K23/004—Counters counting in a non-natural counting order, e.g. random counters
    • H03K23/005—Counters counting in a non-natural counting order, e.g. random counters using minimum change code, e.g. Gray Code
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K21/00—Details of pulse counters or frequency dividers
    • H03K21/02—Input circuits

Landscapes

  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

1,187,868. Electric counters. DECCA Ltd. 14 Nov., 1968 [21 Nov., 1967], No. 52908/67. Heading G4A. A counter designed to count in Gray code has a number of stages 19, 20, 21 connected by And gates 23, 25, the input being from a moving scale member having alternate opaque and translucent portions sensed by photo-cells 16, 17 spaced one unit distance apart, the scale portions being twice this distance in length. If the position shown represents an even number, the cell 16 changes from "0" to "1" when the number changes to the odd number above it, but does not change when the number changes to the odd number below it. Cell 17 does not change in the first case, and does change in the second. The lowest significance stage 19 responds directly to the input from cell 16 which is shown as i in Fig. 3. The output from photo-cell 17 is differentiated at 22 and applied to And gates 23 and 24. The "1" output from stage 19 is applied to And gate 23 and the "0" output to gate 24. Stages 20, 21 &c. change state whenever a "1" input is received. State 20 can therefore change only when stage 19 is in the "1" state, and cell 17 changes from "1" to "0". If stage 19 is in the "0" state, gate 24 is enabled so that an output from differentiator 22 is transmitted to stage 21 instead of stage 20. If both stages 19 and 20 are in the "0" state, the change signal is passed on to the next stage again by gate 26. Specification 1,176,556 is referred to.
GB5290867A 1967-11-21 1967-11-21 Improvements in Digital Counters. Expired GB1187868A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5290867A GB1187868A (en) 1967-11-21 1967-11-21 Improvements in Digital Counters.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5290867A GB1187868A (en) 1967-11-21 1967-11-21 Improvements in Digital Counters.

Publications (1)

Publication Number Publication Date
GB1187868A true GB1187868A (en) 1970-04-15

Family

ID=10465784

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5290867A Expired GB1187868A (en) 1967-11-21 1967-11-21 Improvements in Digital Counters.

Country Status (1)

Country Link
GB (1) GB1187868A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456193A2 (en) * 1990-05-09 1991-11-13 Matsushita Electric Industrial Co., Ltd. Image pickup apparatus and counter circuit used therein
WO1993018588A1 (en) * 1992-03-10 1993-09-16 Art Tech Gigadisc 'atg' Incremental-decremental counter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456193A2 (en) * 1990-05-09 1991-11-13 Matsushita Electric Industrial Co., Ltd. Image pickup apparatus and counter circuit used therein
EP0456193A3 (en) * 1990-05-09 1992-11-25 Matsushita Electric Industrial Co., Ltd. Image pickup apparatus and counter circuit used therein
US5191425A (en) * 1990-05-09 1993-03-02 Matsushita Electric Industrial Co., Ltd. Image pickup apparatus having a gray counter
EP0674391A3 (en) * 1990-05-09 1995-11-02 Matsushita Electric Ind Co Ltd
WO1993018588A1 (en) * 1992-03-10 1993-09-16 Art Tech Gigadisc 'atg' Incremental-decremental counter
FR2688610A1 (en) * 1992-03-10 1993-09-17 Atg Sa COUNTER-COUNTERPACKING DEVICE.
US5461375A (en) * 1992-03-10 1995-10-24 Art Tech Gigadisc Forward/backward counting device

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees