Record carrier, method of producing the record carrier and method for reproducing stored signal therefrom
US3936867A · kind A · utility
1Cited by
2References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1974 |
| Grant date | Feb 3, 1976 |
| Priority date | — |
| Expiry date | Jan 28, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/80
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of producing a record carrier with stored signals thereon and the record made thereby. The method comprises applying to a flexible record carrier hill and dale undulations which correspond to a broadband signal in the form of a frequency modulated carrier frequency oscillation, further applying at least one further signal of lower frequency superimposed on the broadband signal, and selecting an amplitude for the further signal such that in playback of the stored signals by a skid-shaped pickup operating by compression of the hills, even the lowest hills contact the skid-shaped pickup and are compressed thereby.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.