Pilot signal recording and reproducing system
US4414586A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1981 |
| Grant date | Nov 8, 1983 |
| Priority date | — |
| Expiry date | Oct 5, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/103
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pilot signal recording and reproducing system comprises a frequency generating circuit for successively generating a first frequency, a third frequency, a second frequency, and a fourth frequency in this order or in a reverse order for every recording unit of one track, where the first and second frequencies are mutually separated frequencies, selected from a first frequency group, and the third and fourth frequencies respectively are frequencies approximately equal to the first and second frequencies, selected from a second frequency group, a recording device for recording a frequency obtained from the frequency generating circuit as a pilot signal together with an information signal onto a recording medium, a comb filter for frequency-selecting pilot signals recorded on both sides of a track which is to be reproduced, where these pilot signals have mutually different frequencies and are included as crosstalk within a reproduced signal reproduced from the recording medium, a control circuit for controlling a delay time of a delay circuit within said comb filter and first and second filter circuits for respectively discriminating and separating pilot signals having mutually diffe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.