US3886456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wired broadcasting systems providing telephone communication
Assignee: Communications Patents Ltd
•
Filing: 1972-11-28
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Granted: 1975-05-27
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Expires: 1992-11-28
Abstract
Abstract A wired broadcasting system in which subscribers are connected to a programme exchange through their own individual pairs of twisted conductors. Each pair is associated with an intersticial pair of conductors suitable for low frequency signals. Provision is made for connecting conventional telephone instruments at the subscriber station which is linked to a telephone exchange through a pair of the said conductors.
Inventors
- 👤 Eric John Gargini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:29
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/173; H04N7/17345
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
254 words
A wired broadcasting system in which each of a plurality of subscribers is connected to a programme exchange through the intermediary of a cable with a twisted pair of high frequency conductors suitable for the transmission of high frequency television signals and having associated therewith a twisted pair of intersticial audio frequency conductors suitable for the transmission of audio frequency signals and in which means are provided including a central programme exchange with programme selection means and a telephone exchange, a telephone instrument at the subscribers premises connected to said telephone exchange through said pair of intersticial conductors, means at said subscribers premises for sending DC signals over at least one of the high frequency conductors to operate said programme selection means, a television programme selector switch, means effecting signalling and control of the television programme selector switch at the programme exchange through the high frequency conductors in conjunction with a return path formed by a cable screen about the conductors between the programme exchange and the subscriber, a dial selector having off normal contacts connected to mute the audio, means to introduce direct current signalling pulses into one of the high frequency conductors, and means providing that audio frequency signals for television or radio sound programmes are carried by the high frequency conductors and are coupled to the subscriber''s equipment through a transformer having an audio path blocked by said off normal muting contacts during operation of said dial selector to apply direct current signalling pulses into one of the high frequency conductors.
Claim 2
Dependent Claim
254 words
A wired broadcasting system in which each of a plurality of subscribers is connected to a programme exchange through the intermediary of a cable with a twisted pair of high frequency conductors suitable for the transmission of high frequency television signals and having associated therewith a twisted pair of intersticial audio frequency conductors suitable for the transmission of audio frequency signals and in which means are provided including a central programme exchange with programme selection means and a telephone exchange, a telephone instrument at the subscribers premises connected to said telephone exchange through said pair of intersticial conductors, means at said subscribers premises for sending DC signals over at least one of the high frequency conductors to operate said programme selection means, a television programme selector switch, means effecting signalling and control of the television programme selector switch at the programme exchange through the high frequency conductors in conjunction with a return path formed by a cable screen about the conductors between the programme exchange and the subscriber, a dial selector having off normal contacts connected to mute the audio, means to introduce direct current signalling pulses into one of the high frequency conductors, and means providing that audio frequency signals for television or radio sound programmes are carried by the high frequency conductors and are coupled to the subscriber''s equipment through a transformer having an audio path blocked by said off normal muting contacts during operation of said dial selector to apply direct current signalling pulses into one of the high frequency conductors.
Claim 3
Dependent Claim
47 words
A wired broadcasting system as claimed in claim 1, including a subscriber''s control switch with a dial selector and springset, and means including the springset adapted to apply a direct current path between one of the high frequency conductors and the cable screen to effect programme selection.
Claim 4
Dependent Claim
64 words
A wired broadcasting system as claimed in claim 1, including a program selection switch with means resetting it to a datum position, wherein a reset switch is provided for operation by the subscriber which is adapted to apply a direct current path between one of the high frequency conductors and the cable screen for returning the subscriber''s programme selection switch to a datum position.
Claim 5
Dependent Claim
221 words
A wired broadcasting system in which each of a plurality of subscribers is connected to a programme exchange through the intermediary of a cable with a twisted pair of high frequency conductors suitable for the transmission of high frequency television signals and having associated therewith a twisted pair of intersticial audio frequency conductors suitable for the transmission of audio frequency signals and in which means are provided including a central programme exchange with programme selection means and a telephone exchange, a telephone instrument at the subscribers premises connected to said telephone exchange through said pair of intersticial conductors, and means at said subscribers premises for sending DC signals over at least one of the high frequency conductors to operate said programme selection means having a television programme selecTor switch and including means effecting signalling and control of the television programme selector switch at the programme exchange by polarised direct current signalling through the high frequency pair and polarised responsive devices at the programme exchange responding to said polarised direct current to operate said selector switch, wherein the polarised responsive devices comprise two relays, one being arranged to effect selection of television programmes by means of the subscriber'' s television programme selector switch and the other being arranged to effect return of the subscriber''s television programme selector switch to a datum position.
Claim 6
Dependent Claim
221 words
A wired broadcasting system in which each of a plurality of subscribers is connected to a programme exchange through the intermediary of a cable with a twisted pair of high frequency conductors suitable for the transmission of high frequency television signals and having associated therewith a twisted pair of intersticial audio frequency conductors suitable for the transmission of audio frequency signals and in which means are provided including a central programme exchange with programme selection means and a telephone exchange, a telephone instrument at the subscribers premises connected to said telephone exchange through said pair of intersticial conductors, and means at said subscribers premises for sending DC signals over at least one of the high frequency conductors to operate said programme selection means having a television programme selecTor switch and including means effecting signalling and control of the television programme selector switch at the programme exchange by polarised direct current signalling through the high frequency pair and polarised responsive devices at the programme exchange responding to said polarised direct current to operate said selector switch, wherein the polarised responsive devices comprise two relays, one being arranged to effect selection of television programmes by means of the subscriber'' s television programme selector switch and the other being arranged to effect return of the subscriber''s television programme selector switch to a datum position.
Claim 7
Dependent Claim
20 words
A wired broadcasting system as claimed in claim 4, wherein the signalling potential is derived locally at the subscriber''s premises.
Claim 8
Dependent Claim
42 words
A wired broadcasting system as claimed in claim 5, wherein the subscriber''s equipment comprises an AC driven DC power supply with means connecting output terminals to the high frequency conductors with one or other polarity depending upon the relay to be selected.
Claim 9
Dependent Claim
43 words
A wired broadcasting system as claimed in claim 4, including means wherein at the programme exchange signals received from the high frequency pair are extracted through a vision and sound balancing transformer and are arranged to operate either of said two polarised relays.
Claim 10
Dependent Claim
25 words
A wired broadcasting system as claimed in claim 7, wherein the polarised relays are formed by non polarised relays each having associated therewith a diode.
Claim 11
Dependent Claim
168 words
A wired broadcasting system in which each of a plurality of subscribers is connected to a programme exchange through the intermediary of a cable with a twisted pair of high frequency conductors suitable for the transmission of high frequency television signals and having associated therewith a twisted pair of intersticial audio frequency conductors suitable for the transmission of audio frequency signals and in which means are provided including a central programme exchange with programme selection means and a telephone exchange, a telephone instrument at the subscribers premises connected to said telephone exchange through said pair of intersticial conductors, and means at said subscribers premises for sending DC signals over at least one of the high frequency conductors to operate said programme selection means having a subscriber''s television programme selector switch and including means effecting signalling and control of the subscriber''s television programme selector switch at the programme exchange, and means coupled with the subscriber''s selector switch disconnecting the telephone circuit during the period required for television programme selection.
Claim 12
Dependent Claim
168 words
A wired broadcasting system in which each of a plurality of subscribers is connected to a programme exchange through the intermediary of a cable with a twisted pair of high frequency conductors suitable for the transmission of high frequency television signals and having associated therewith a twisted pair of intersticial audio frequency conductors suitable for the transmission of audio frequency signals and in which means are provided including a central programme exchange with programme selection means and a telephone exchange, a telephone instrument at the subscribers premises connected to said telephone exchange through said pair of intersticial conductors, and means at said subscribers premises for sending DC signals over at least one of the high frequency conductors to operate said programme selection means having a subscriber''s television programme selector switch and including means effecting signalling and control of the subscriber''s television programme selector switch at the programme exchange, and means coupled with the subscriber''s selector switch disconnecting the telephone circuit during the period required for television programme selection.
Claim 13
Dependent Claim
31 words
A wired broadcasting system as claimed in claim 9, including means selectively connecting the telephone instrument and the subscriber''s programme selector switch to the conductor pairs through a subscriber actuable switch.
Claim 14
Dependent Claim
52 words
A wired broadcasting system as claimed in claim 10, wherein the subscriber actuable switch is biased to a position in which the telephone instrument is connected to the audio frequency pair and is actuable to connect the programme selector switch thereto at those times when the subscriber desires to effect programme selection.
Claim 15
Dependent Claim
33 words
A wired broadcasting system as claimed in claim 11, including means connected to said subscriber actuable switch effective to mute the audio feed to the subscriber''s equipment whilst the telephone is in use.
Claim 16
Dependent Claim
29 words
A wired broadcasting system as claimed in claim 9, including means responsive to actuation of the subscriber''s selector switch effective to apply DC signals to the high frequency pair.
Claim 17
Dependent Claim
53 words
A wired broadcasting system as claimed in claim 9, wherein at the programme exchange a control relay having change over contacts is provided, and means operating said contacts in the normal position to connect the audio frequency pair to the telephone exchange and in the other position to the television programme selection equipment.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |