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
2026-10-24 21:06
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)
US3021384A
Cited
US3423520A
Cited
US3889063A
Cited
US4052563A
Cited
US4320511A
Cited
US4382266A
Cited
US4484218A
Cited
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 |