US4425562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for coding signals which are distributed between a number of channels
Assignee: US Philips Corp
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Filing: 1982-02-22
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Granted: 1984-01-10
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Expires: 2002-02-22
Abstract
Abstract A device for introducing digital data into a medium having bivalent or multivalent states and having a coding device and a commutation device. The coding device receives under the control of a first clock pulse series, data signals and forms therefrom a number of code bits which are combined as an input to the commutation device. The coding efficiency is smaller than 1. Under the control of a second clock pulse series, the commutation device switches each input to apply the code bits to a number of channels of the medium, so that for each channel certain code restrictions are satisfied.
Inventors
- 👤 Edmond de Niet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:30
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
205 words
A device for introducing digital signals into a medium having at least bivalent states, comprising: clock means; data input means for serially receiving a flow of data bits under the control of a first clock pulse series at a first frequency generated by said clock means; coding means for receiving said flow of data bits from said data input means and for generating n code bits in parallel based on running selections from said data bits received under control of a second clock pulse series at a second frequency generated by said clock pulse means, said second frequency being n/p times lower than said first frequency, wherein p is greater than 1; commutation means having n inputs connected to said coding means for receiving said generated n code bits, said commutation means being provided for cyclically commuting synchronously with said second clock pulse series the sequence of said n code bits to m=j×n outputs thereof, wherein j is an integer and wherein each of the n code bits received at said inputs is presented to at least one of said m outputs, said m outputs being connected to m input channels of said medium for the transmission of the code bits at said m outputs.
Claim 2
Independent Claim
205 words
A device for introducing digital signals into a medium having at least bivalent states, comprising: clock means; data input means for serially receiving a flow of data bits under the control of a first clock pulse series at a first frequency generated by said clock means; coding means for receiving said flow of data bits from said data input means and for generating n code bits in parallel based on running selections from said data bits received under control of a second clock pulse series at a second frequency generated by said clock pulse means, said second frequency being n/p times lower than said first frequency, wherein p is greater than 1; commutation means having n inputs connected to said coding means for receiving said generated n code bits, said commutation means being provided for cyclically commuting synchronously with said second clock pulse series the sequence of said n code bits to m=j×n outputs thereof, wherein j is an integer and wherein each of the n code bits received at said inputs is presented to at least one of said m outputs, said m outputs being connected to m input channels of said medium for the transmission of the code bits at said m outputs.
Claim 3
Dependent Claim
44 words
A device as claimed in claim 1, wherein said coding means comprise a plurality of serially connected shift registers, each of said shift registers having an output thereof connected to an input of a sub-coding device for generating thereby one of said code bits.
Claim 4
Dependent Claim
29 words
A device as claimed in claim 1 wherein the coding device is adapted to pass on a predetermined selection of the data bits as a code bit without modification.
Claim 5
Dependent Claim
32 words
A device as claimed in claim 1 characterized in that for m=n, an NRZ-1 coding element is connected between the relevant outputs of the commutation device and the inputs of the medium.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |