Patent US3801964A successfully refreshed from Google Patents.
Patent US4779129A successfully refreshed from Google Patents.
US4779129A
Expired / Lapsed
US
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FM simultaneous broadcast system for CATV
Assignee: Pioneer Corp
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Filing: 1986-08-29
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Granted: 1988-10-18
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Expires: 2006-08-29
Abstract
Abstract A CATV signal in which a channel allocation for an FM stereo channel is superimposed on the TV audio signal. At the receiving end, the channel allocation is demodulated from the TV audio signal and is used to tune the FM tuner to the allocated channel.
Inventors
- 👤 Nobuo Uee
- 👤 Toru Kawakubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:55
CPC Classifications
H; H04; H04H; H04H60/00; H04H60/09; H04H20/00; H04H20/28; H04H20/65; H04H20/76; H04H60/14; H04H60/23; H04H60/35; H04H60/38; H04H60/41; H04H60/43; H04N; H04N7/00; H04N7/08; H04N7/081; H04N7/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
105 words
A CATV system of the type comprising a cable, a sending side and a receiving side, said sending side comprising: first means for delivering a television signal in a first frequency band, said television signal comprising a video signal and a TV audio signal; second means for delivering an FM stereo signal, corresponding to said television signal, in a frequency channel outside said first freuqency band; a channel data switch for selecting data identifying the channel of the FM stereo signal corresponding to said television signal as an output and means for superimposing said output of said channel data switch on said TV audio signal.
Claim 2
Dependent Claim
105 words
A CATV system of the type comprising a cable, a sending side and a receiving side, said sending side comprising: first means for delivering a television signal in a first frequency band, said television signal comprising a video signal and a TV audio signal; second means for delivering an FM stereo signal, corresponding to said television signal, in a frequency channel outside said first freuqency band; a channel data switch for selecting data identifying the channel of the FM stereo signal corresponding to said television signal as an output and means for superimposing said output of said channel data switch on said TV audio signal.
Claim 3
Dependent Claim
71 words
A CATV system as claimed in claim 1, wherein said receiving side, comprises: means for demodulating said output of said channel data switch superimposed on said TV audio signal from said TV audio signal; an FM tuner receiving said FM stereo signal; means for tuning said FM tuner to said frequency channel according to an output of said demodulating means; and means for receiving said transmitted television signal from said cable.
Claim 4
Dependent Claim
47 words
A CATV system as recited in claim 2, wherein said first delivering means comprises an IF modulator receiving said television signal and a data signal and wherein said superimposing means comprises an FM modulator receiving said output of said channel data switch and providing said data signal.
Claim 5
Dependent Claim
60 words
A CATV system as recited in claim 3, wherein said demodulating means comprises a local oscillator, a mixer receiving said television signal and an output of said local oscillator, a video detector receiving an output of said mixer, an audio detector receiving an output of said video detector and a band pass filter receiving an output of said audio detector
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |