US3736374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wired broadcasting systems
Assignee: Communications Patents Ltd
•
Filing: 1970-06-02
•
Granted: 1973-05-29
•
Expires: 1990-06-02
Abstract
Abstract A hybrid coupling transformer system is used in wired broadcasting systems with two transformers coupled through a pair of series windings on the respective transformers carrying TV signals. A second winding is coupled in series anti-phase and output windings are coupled to subscriber stations. Audio signals are separately connected in some embodiments to centertopped output windings.
Inventors
- 👤 E Gargini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:06
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/10; H04N7/108
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
159 words
A wired broadcasting system including a hybrid arrangement having a pair of input terminals and four pairs of output terminals which includes two transformers each having a first winding, a second winding and a third, tapped, winding, the first windings of said transformers being connected in series between the pair of input terminals, the second windings being connected in series anti-phase between the terminals of an impedence and the third windings each being connected between one of each of a corresponding two of said four pairs of output terminals, the other terminal of each of said four pairs being connected to a common conductor, the tapping point of each third winding being connected to said common conductor through two impedences in series one of which has an impedence which is appreciable in the audio frequency range but is low in the high frequency range, and means for connecting in shunt with said one impedence an audio frequency signal source.
Claim 2
Dependent Claim
159 words
A wired broadcasting system including a hybrid arrangement having a pair of input terminals and four pairs of output terminals which includes two transformers each having a first winding, a second winding and a third, tapped, winding, the first windings of said transformers being connected in series between the pair of input terminals, the second windings being connected in series anti-phase between the terminals of an impedence and the third windings each being connected between one of each of a corresponding two of said four pairs of output terminals, the other terminal of each of said four pairs being connected to a common conductor, the tapping point of each third winding being connected to said common conductor through two impedences in series one of which has an impedence which is appreciable in the audio frequency range but is low in the high frequency range, and means for connecting in shunt with said one impedence an audio frequency signal source.
Claim 3
Dependent Claim
26 words
A wired broadcasting system as claimed in claim 1, wherein the audio frequency source is connected to said one impedence through a high frequency filter arrangement.
Claim 4
Dependent Claim
26 words
A wired broadcasting system as claimed in claim 2, wherein said one impedence is arranged to have one of its terminals connected to the common conductor.
Claim 5
Dependent Claim
89 words
A wired broadcasting system as claimed in claim 1, wherein the audio frequency signal source is applied to the input terminals of the hybrid arrangement and is coupled to its output terminals by means which include an impedence arranged in series with the input terminals which is appreciable over the audio frequency range but low in the high frequency range and a connection extending between said impedence and the junction between the series pairs of impedences connected between the tapping point on the third windings and the common conductor.
Claim 6
Dependent Claim
77 words
A wired broadcasting system as claimed in claim 4, wherein the impedence in series with the input terminals has one of its terminals connected to the common conductor thereby also simultaneously to form one of those associated with the high frequency filters through which the audio frequency signals are supplied across said one impedences which may also have one terminal connected to the common conductor and each form a further part of the corresponding high frequency filter.
Claim 7
Dependent Claim
105 words
A wired broadcasting system as claimed in claim 1, wherein the hybrid arrangement has associated with at least one of the output terminals thereof an impedence transformer the output impedence of which is arranged to feed the input terminals of a further hybrid arrangement, the impedence transformer having connected in series with its primary winding an impedence which is low in the high frequency range but is high in the audio frequency range, whilst its secondary winding is connected between an auxiliary output terminal and one of the junctions between the pairs of series impedences associated with the tapped third windings of the hybrid transformers.
References Cited (Backward Citations)
US3244809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |