GB1404587A - Interpolation circuits - Google Patents
Interpolation circuitsInfo
- Publication number
- GB1404587A GB1404587A GB5055171A GB5055171A GB1404587A GB 1404587 A GB1404587 A GB 1404587A GB 5055171 A GB5055171 A GB 5055171A GB 5055171 A GB5055171 A GB 5055171A GB 1404587 A GB1404587 A GB 1404587A
- Authority
- GB
- United Kingdom
- Prior art keywords
- time constant
- filter
- oct
- input signals
- counter
- 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
- H03M1/66—Digital/analogue converters
- H03M1/661—Improving the reconstruction of the analogue output signal beyond the resolution of the digital input signal, e.g. by interpolation, by curve-fitting, by smoothing
Abstract
1404587 Digital to analogue converters EMI Ltd 30 Oct 1972 [30 Oct 1971] 59551/71 Heading H3H In forming an audio signal from digitally coded input signals using interpolation to reduce noise, the difference between successive pairs of input signals is converted to an analogue signal, integrated at 6 and fed through a low pass filter, 7, 14, 15, the time constant of which is varied in dependence on the time elapsed since the last non-zero output from the subtraction circuit 4. The sampling periods are counted in a counter 20 which is cleared whenever a non- zero difference occurs, the output of the counter controlling field effect transistors 11, 12, 13 to switch in or out resistances 8, 9, 10 to control the time constant of the filter. The time constant of 14, 15 alone is about 1/3 of the sampling period. To avoid loss of early portions of changes occuring after a long steady state, a delay may be included in the main channel between the subtracting circuit 4 and the filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5055171A GB1404587A (en) | 1971-10-30 | 1971-10-30 | Interpolation circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5055171A GB1404587A (en) | 1971-10-30 | 1971-10-30 | Interpolation circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1404587A true GB1404587A (en) | 1975-09-03 |
Family
ID=10456326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5055171A Expired GB1404587A (en) | 1971-10-30 | 1971-10-30 | Interpolation circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1404587A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0840096A1 (en) * | 1996-10-29 | 1998-05-06 | Mitutoyo Corporation | Interpolation circuit for encoder |
-
1971
- 1971-10-30 GB GB5055171A patent/GB1404587A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0840096A1 (en) * | 1996-10-29 | 1998-05-06 | Mitutoyo Corporation | Interpolation circuit for encoder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |