GB1457556A - Coil arrangement for relay - Google Patents
Coil arrangement for relayInfo
- Publication number
- GB1457556A GB1457556A GB694574A GB694574A GB1457556A GB 1457556 A GB1457556 A GB 1457556A GB 694574 A GB694574 A GB 694574A GB 694574 A GB694574 A GB 694574A GB 1457556 A GB1457556 A GB 1457556A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sample
- information
- circuit
- predicted
- difference
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
1457556 Television INTERNATIONAL STANDARD ELECTRIC CORP 15 Feb 1974 [26 Feb 1973] 6945/74 Heading H4F In a differential pulse code modulation system for the transmission of picture information, if the difference between two compared signal sample values exceeds a predetermined magnitude then the difference between the present sample value and a value predicted (i.e. interpolated) from previous sample values is transmitted, this difference signal being added to a similarly predicted value at a receiver in response to a flag bit transmitted with the location and difference amplitude value bits forming the DPCM signal. In a standard DPCM transmitter, sample values of the video signal delayed by one sampling period by delay V1 are subtracted (Diff) from the input sample values, the differences being quantized (Qu), encoded (Cod), and combined with sync. code words generated G from separated (Au) sync. pulses in a transmitting circuit (Sk). As shown the output from delay V1 is fed back to adder (Su1) in the conventional manner. According to the invention if the difference output from quantizer (Qu) exceeds a predetermined magnitude as determined by a threshold circuit SW a gate circuit T is enabled to pass the sample output from adder Su1 and sample position information (from a counter Za) to a circuit VA which compares this sample magnitude information with corresponding sample information from the previous line (or picture) stored in store Sp. This sample information is then stored in the store Sp together with predicted sample information and associated flag bit for use in the next line (or picture). A location comparator circuit VP continuously compares the sample position information signal from counter Za with those stored in store Sp corresponding to predicted samples and when they agree a circuit St is actuated to switch contact u to pass the predicted sample value to the subtractor (Diff). A receiver is described with reference to Fig. 2 (not shown) in which the subtractor is replaced by an adder.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2309444A DE2309444C3 (en) | 1973-02-26 | 1973-02-26 | System for digital image transmission using differential pulse code modulation (DPCM) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1457556A true GB1457556A (en) | 1976-12-08 |
Family
ID=5873085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB694574A Expired GB1457556A (en) | 1973-02-26 | 1974-02-15 | Coil arrangement for relay |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5250097B2 (en) |
| DE (1) | DE2309444C3 (en) |
| GB (1) | GB1457556A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0775974A3 (en) * | 1995-11-22 | 1998-04-29 | Cirrus Logic, Inc. | Apparatus for image scaling using interpolation |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2460580A1 (en) * | 1979-06-29 | 1981-01-23 | France Etat | DEVICE FOR TRACKING AND ESTIMATING RECURSIVE LOCAL STATUS OF IMAGE CONTOURS AND APPLICATION TO ADAPTIVE PREDICTION IN DIFFERENTIAL CODING OF TELEVISION SIGNALS |
| JPS58179897A (en) * | 1982-04-14 | 1983-10-21 | 日本電気株式会社 | Coding method and apparatus for adaptive forecasting type adpcm |
| DE3310824A1 (en) * | 1983-03-24 | 1984-09-27 | Zdzislaw Toronto Ontario Gulczynski | Video processor |
| US5883976A (en) * | 1994-12-28 | 1999-03-16 | Canon Kabushiki Kaisha | Selectively utilizing multiple encoding methods |
-
1973
- 1973-02-26 DE DE2309444A patent/DE2309444C3/en not_active Expired
-
1974
- 1974-02-15 GB GB694574A patent/GB1457556A/en not_active Expired
- 1974-02-26 JP JP49022022A patent/JPS5250097B2/ja not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0775974A3 (en) * | 1995-11-22 | 1998-04-29 | Cirrus Logic, Inc. | Apparatus for image scaling using interpolation |
| US5850207A (en) * | 1995-11-22 | 1998-12-15 | Cirrus Logic, Inc. | Method and apparatus for minimizing effects of slope overload condition when using differential pulse code modulation scheme |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2309444C3 (en) | 1980-06-04 |
| JPS502413A (en) | 1975-01-11 |
| JPS5250097B2 (en) | 1977-12-22 |
| DE2309444B2 (en) | 1979-09-20 |
| AU6583974A (en) | 1975-08-21 |
| DE2309444A1 (en) | 1974-08-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |