US4156256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for the recording and reproduction of wide frequency band video signals
Assignee: Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Filing: 1977-09-08
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Granted: 1979-05-22
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Expires: 1997-09-08
Abstract
Abstract Method of recording and reproduction of wide frequency band video signals onto or from a magnetizable recording carrier, carried out by the following means: means for separating of the video frequency signals into first and second signals of lower and upper frequency range respectively, for converting said second signal into a third signal the frequency range of which equaling that of said first signal, for frequency modulating a carrier wave frequency by said first and third signals and for recording the frequency modulated signals by means of a twin head, for reproducing the recorded signals by means of a twin head and for amplifying, limiting and demodulating the recorded signals and reconverting the third signal into its original frequency range and combining the so reconverted third signal and said first signal.
Inventors
- 👤 Michael Obremski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:09
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/917; H04N5/919; H04N11/00; H04N11/24; H04N11/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
An apparatus for the recording and reproducing of wide frequency band color video signals onto or from two adjacent tracks of a magnetizable recording carrier, whereat the color video signal to be recorded is separated into a lower and upper frequency range, said lower frequency range frequency modulating a carrier wave, said apparatus further comprising: a. means for converting said upper frequency range into said lower frequency range; b. means for frequency modulating said carrier wave by said converted upper frequency range; c. twin head means for simultaneously recording both said frequency modulated signals; and, d. means for reproducing the recorded signals encoding the twin head, means for amplifying, limiting and demodulating the recorded signals and for reconverting the converted upper frequency range into its original frequency range and for combining the reconverted signal and the lower frequency range signal.
Claim 2
Independent Claim
140 words
An apparatus for the recording and reproducing of wide frequency band color video signals onto or from two adjacent tracks of a magnetizable recording carrier, whereat the color video signal to be recorded is separated into a lower and upper frequency range, said lower frequency range frequency modulating a carrier wave, said apparatus further comprising: a. means for converting said upper frequency range into said lower frequency range; b. means for frequency modulating said carrier wave by said converted upper frequency range; c. twin head means for simultaneously recording both said frequency modulated signals; and, d. means for reproducing the recorded signals encoding the twin head, means for amplifying, limiting and demodulating the recorded signals and for reconverting the converted upper frequency range into its original frequency range and for combining the reconverted signal and the lower frequency range signal.
Claim 3
Dependent Claim
30 words
The apparatus in accordance with claim 1 wherein the mixing frequency used for the converting and reconverting of the upper frequency range is an integral multiple of the line frequency.
Claim 4
Dependent Claim
31 words
The apparatus in accordance with claim 1 wherein the individual recording heads of the twin head have azimuth-angles which are different from zero and are equal in value but oppositely inclined.
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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) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |