Patent US4513315A successfully refreshed from Google Patents.
US4513315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Community antenna television arrangement for the reception and distribution of TV - and digital audio signals
Assignee: US Philips Corp
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Filing: 1982-06-01
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Granted: 1985-04-23
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Expires: 2002-06-01
Abstract
Abstract Community antenna television arrangement for the reception and distribution of TV signals and digital audio signals, in particular signals which are transmitted per satellite, including a head-end connected to a receiving antenna and a signal distribution network, a time-division multiplex signal which comprises the digital audio signals in a time-multiplex distribution, being applied to the head-end, which time-division multiplex signal is modulated on a sound carrier, the bit rate of the digital audio signals to be distributed being reduced in the head-end of the community antenna television arrangement by a TDM/FDM conversion in order to reduce signal echoes.
Inventors
- 👤 Cornelis B. Dekker
- 👤 Lodewijk B. Vries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:28
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/65; H04H20/76; H04H20/77; H04H20/78; H04H20/79; H04H40/00; H04H40/18; H04H40/27; H04H40/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
A community antenna television arrangement for the reception and distribution of TV signals and digital audio signals, particularly those signals which are transmitted by satellite, comprising a head-end, connected to a receiving antenna and a signal distribution network, a time-division multiplex signal which incorporates said digital audio signals in a time-division multiplex distribution being applied to said head end, which time-division multiplex signal is modulated on a sound carrier, characterized in that the head-end comprises a demodulation arrangement for demodulating the time-division multiplex signal to the baseband, a demultiplexing arrangement for demultiplexing the time-division multiplex signal, this demultiplexing arrangement having parallel outputs at which the digital audio signals are available in parallel, which outputs are connected to modulators of a modulation arrangement for modulating the digital audio signals on separate audio carriers, the modulation arrangement being connected to the signal distribution network for applying the digital audio signals to a plurality of subscribers' connecting points.
Claim 2
Dependent Claim
155 words
A community antenna television arrangement for the reception and distribution of TV signals and digital audio signals, particularly those signals which are transmitted by satellite, comprising a head-end, connected to a receiving antenna and a signal distribution network, a time-division multiplex signal which incorporates said digital audio signals in a time-division multiplex distribution being applied to said head end, which time-division multiplex signal is modulated on a sound carrier, characterized in that the head-end comprises a demodulation arrangement for demodulating the time-division multiplex signal to the baseband, a demultiplexing arrangement for demultiplexing the time-division multiplex signal, this demultiplexing arrangement having parallel outputs at which the digital audio signals are available in parallel, which outputs are connected to modulators of a modulation arrangement for modulating the digital audio signals on separate audio carriers, the modulation arrangement being connected to the signal distribution network for applying the digital audio signals to a plurality of subscribers' connecting points.
Claim 3
Dependent Claim
38 words
A community antenna television arrangement as claimed in claim 1, characterized in that the modulation frequencies of the said modulators are located in several, mutually separated, non-occupied frequency regions in or near the standard VHF and UHF bands.
Claim 4
Dependent Claim
53 words
A community antenna television arrangement as claimed in claim 1 or claim 2, characterized in that between the demultiplexing arrangement and the demodulation arrangement an encoding circuit is arranged for coding the digital audio signals into discrete multi-level signals, which after modulation are adapted to the transmission properties of the signal distribution network.
Claim 5
Dependent Claim
39 words
A community antenna arrangement as claimed in claim 3, the digital audio signals of the received time-division multiplex signals having been coded in an error-correcting code, characterized in that the demultiplexing arrangement is connected to an error-correcting decoding arrangement.
Claim 6
Dependent Claim
15 words
A receiver for connection to a community antenna television arrangement as claimed in claim 1.
Claim 7
Dependent Claim
30 words
A receiver as claimed in claim 5, characterized in that said receiver comprises an echo canceller connected to a tuning unit for reducing echoes in the received digital audio signal.
References Cited (Backward Citations)
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US3423520A
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US3889063A
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US4052563A
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US4320511A
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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) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |