Patent US4353088A successfully refreshed from Google Patents.
US4353088A
Expired / Lapsed
US
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Coding and decoding system for video and audio signals
Assignee: TV/COM TECHNOLOGIES Inc
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Filing: 1980-05-14
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Granted: 1982-10-05
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Expires: 2000-05-14
Abstract
Abstract A coding and decoding system for video signals includes means at the transmitter for applying sine wave amplitude modulation of approximate line frequency to the aural carrier to prevent the chrominance subcarrier from providing receiver synchronization.
Inventors
- 👤 Pieter den Toonder
- 👤 Pieter J. Fondse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:12
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/167; H04N7/171; H04N7/1713
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
62 words
Means for coding video and audio signals including: (a) means for suppressing synchronizing information during video horizontal blanking intervals, (b) means for inserting digital sound data and decoder clock data into the suppressed horizontal blanking intervals, (c) and means for applying sine wave amplitude modulation of approximate line frequency to the aural carrier to prevent the chrominance subcarrier from providing receiver synchronization.
Claim 2
Dependent Claim
62 words
Means for coding video and audio signals including: (a) means for suppressing synchronizing information during video horizontal blanking intervals, (b) means for inserting digital sound data and decoder clock data into the suppressed horizontal blanking intervals, (c) and means for applying sine wave amplitude modulation of approximate line frequency to the aural carrier to prevent the chrominance subcarrier from providing receiver synchronization.
Claim 3
Dependent Claim
33 words
The coding system of claim 8 further characterized in that said sine wave amplitude modulation has a center frequency of 15.75 KHz and frequency variation therefrom on the order of about ±30 Hz.
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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) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |