GB1209522A - Non-linear coder - Google Patents
Non-linear coderInfo
- Publication number
- GB1209522A GB1209522A GB269568A GB269568A GB1209522A GB 1209522 A GB1209522 A GB 1209522A GB 269568 A GB269568 A GB 269568A GB 269568 A GB269568 A GB 269568A GB 1209522 A GB1209522 A GB 1209522A
- Authority
- GB
- United Kingdom
- Prior art keywords
- decoder
- signal
- bits
- register
- jan
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/34—Analogue value compared with reference values
- H03M1/38—Analogue value compared with reference values sequentially only, e.g. successive approximation type
- H03M1/46—Analogue value compared with reference values sequentially only, e.g. successive approximation type with digital/analogue converter for supplying reference values to converter
- H03M1/464—Non-linear conversion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/664—Non-linear conversion not otherwise provided for in subgroups of H03M1/66
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/74—Simultaneous conversion
- H03M1/78—Simultaneous conversion using ladder network
- H03M1/785—Simultaneous conversion using ladder network using resistors, i.e. R-2R ladders
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
1,209,522. Analogue/digital converters. INTERNATIONAL STANDARD ELECTRIC CORP. 18 Jan., 1968 [23 Jan., 1967], No. 2695/68. Heading G4H. A decoder having a characteristic curve comprising straight line segments, the slopes of consecutive segments being in a 2 to 1 ratio, e.g. the decoder of Specification 1,154,828, is included in the feedback loop of a non-linear coder in which the feedback signal from the decoder is compared with a signal representing the analogue input in a comparator 2 (Fig. 3), controlling logic circuitry 11 connected to the decoder. The decoder comprises a register RG (Fig. 2) for a seven bit number, the first bit BI of which represents the polarity, a decoder ZD which converts digits B1-B4 to a signal on the one of fourteen lines CM , C<SP>11</SP>... C<SP>17</SP>, CP, C<SP>11</SP>2... C<SP>11</SP>7, this signal opening an associated gate P<SP>1</SP>I ... P<SP>11</SP>7 to determine the point of injection of a current, the value of which depends on the three least significant bits B5-B7 conarolling constant current generators G2-G4 tnd bits B2-B4 controlling via OR gate 1 a constant current generator G1, into one or other of two identical ladder networks SN, SP. The voltage across AB represents the number in register RG, the contents of which are controlled by the logic circuitry 11 so that first the polarity bits B1 is determined and then successive bits B2-B7 of the register are switched in until coincidence between the input signal and the output of the decoder is achieved.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR92069A FR1520485A (en) | 1967-01-23 | 1967-01-23 | Non-linear encoder with discontinuous characteristic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1209522A true GB1209522A (en) | 1970-10-21 |
Family
ID=8624212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB269568A Expired GB1209522A (en) | 1967-01-23 | 1968-01-18 | Non-linear coder |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE709720A (en) |
| FR (1) | FR1520485A (en) |
| GB (1) | GB1209522A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2315802A1 (en) * | 1975-06-24 | 1977-01-21 | Thomson Csf | A-D coder for PCM telephone network - is optimised for eight incoming analog channels (BE231276) |
| US5455582A (en) * | 1992-12-17 | 1995-10-03 | Ulsi Technology, Inc. | Digital to analog converter employing R-2R ladders with substituted shunt arms |
-
1967
- 1967-01-23 FR FR92069A patent/FR1520485A/en not_active Expired
-
1968
- 1968-01-18 GB GB269568A patent/GB1209522A/en not_active Expired
- 1968-01-23 BE BE709720D patent/BE709720A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR1520485A (en) | 1968-04-12 |
| BE709720A (en) | 1968-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
| PCNP | Patent ceased through non-payment of renewal fee |