US3715673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise suppression for communication cables
Assignee: BAUM ELEKTROPHYSIK GmbH
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Filing: 1971-02-17
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Granted: 1973-02-06
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Expires: 1991-02-17
Abstract
Abstract Noise developed along the sheath (or shield) of a communications cable, is bucked out by means of an amplifier-transformer combination located in proximity to the terminal facility which receives a cable. The bucking voltage is applied to the sheath itself. The sheath itself may be wound so as to constitutes the secondary winding of the transformer.
Inventors
- 👤 W Baum
- 👤 M Still
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:45
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/28
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
196 words
A communications device comprising, in combination, a communications cable having first and second ends, said first end being adapted for connection to signal sources, a terminal facility, said second end being connected to said terminal facility, said cable comprising at least one signal communications conductor for transferring communications signals, at least one neutral potential conductor coextensive therewith, means for connecting the end of said neutral potential conductor adjacent said signal sources to ground, and a conductive sheath at least shielding said signal communications conductor, a signal amplifier having an input side and an output side, means for connecting the input side of said amplifier to the end of said neutral potential conductor adjacent said second end of said communications cable connected to said terminal facility, a transformer having a primary winding connected to the output side of said amplifier and a secondary winding electromagnetically coupled to the end of said signal conductor adjacent said secondend of said communications cable connected to said terminal facility, the phasing of said signal amplifier and the winding sense of said secondary winding being such as to cause the bucking out of noise potentials at the input of said terminal facility.
Claim 2
Dependent Claim
196 words
A communications device comprising, in combination, a communications cable having first and second ends, said first end being adapted for connection to signal sources, a terminal facility, said second end being connected to said terminal facility, said cable comprising at least one signal communications conductor for transferring communications signals, at least one neutral potential conductor coextensive therewith, means for connecting the end of said neutral potential conductor adjacent said signal sources to ground, and a conductive sheath at least shielding said signal communications conductor, a signal amplifier having an input side and an output side, means for connecting the input side of said amplifier to the end of said neutral potential conductor adjacent said second end of said communications cable connected to said terminal facility, a transformer having a primary winding connected to the output side of said amplifier and a secondary winding electromagnetically coupled to the end of said signal conductor adjacent said secondend of said communications cable connected to said terminal facility, the phasing of said signal amplifier and the winding sense of said secondary winding being such as to cause the bucking out of noise potentials at the input of said terminal facility.
Claim 3
Dependent Claim
196 words
A communications device comprising, in combination, a communications cable having first and second ends, said first end being adapted for connection to signal sources, a terminal facility, said second end being connected to said terminal facility, said cable comprising at least one signal communications conductor for transferring communications signals, at least one neutral potential conductor coextensive therewith, means for connecting the end of said neutral potential conductor adjacent said signal sources to ground, and a conductive sheath at least shielding said signal communications conductor, a signal amplifier having an input side and an output side, means for connecting the input side of said amplifier to the end of said neutral potential conductor adjacent said second end of said communications cable connected to said terminal facility, a transformer having a primary winding connected to the output side of said amplifier and a secondary winding electromagnetically coupled to the end of said signal conductor adjacent said secondend of said communications cable connected to said terminal facility, the phasing of said signal amplifier and the winding sense of said secondary winding being such as to cause the bucking out of noise potentials at the input of said terminal facility.
Claim 4
Dependent Claim
196 words
A communications device comprising, in combination, a communications cable having first and second ends, said first end being adapted for connection to signal sources, a terminal facility, said second end being connected to said terminal facility, said cable comprising at least one signal communications conductor for transferring communications signals, at least one neutral potential conductor coextensive therewith, means for connecting the end of said neutral potential conductor adjacent said signal sources to ground, and a conductive sheath at least shielding said signal communications conductor, a signal amplifier having an input side and an output side, means for connecting the input side of said amplifier to the end of said neutral potential conductor adjacent said second end of said communications cable connected to said terminal facility, a transformer having a primary winding connected to the output side of said amplifier and a secondary winding electromagnetically coupled to the end of said signal conductor adjacent said secondend of said communications cable connected to said terminal facility, the phasing of said signal amplifier and the winding sense of said secondary winding being such as to cause the bucking out of noise potentials at the input of said terminal facility.
Claim 5
Dependent Claim
36 words
A communications device as claimed in claim 1, wherein a portion of the cable itself is wound about the transformer so that the thereto related portion of said sheath constitutes the secondary winding of the transformer.
Claim 6
Dependent Claim
26 words
A communications device as claimed in claim 1, wherein said sheath and said neutral potential conductor of the cable are maintained at a nominal neutral potential.
Claim 7
Dependent Claim
35 words
A communications device as claimed in claim 3, wherein said neutral potential conductor which is maintained at the nominal neutral potential, is grounded remotely from the terminal facility and, the signal amplifier is grounded locally.
Claim 8
Dependent Claim
25 words
A communications device as claimed in claim 1, wherein said signal amplifier is a wide-band amplifier capable of amplifying substantially the entire audio frequency spectrum.
Claim 9
Dependent Claim
30 words
A communications device as claimed in claim 1, wherein said signal amplifier is a band-pass amplifier capable of amplifying a relatively narrow frequency band centered about a power line frequency.
Claim 10
Dependent Claim
40 words
A communications device as claimed in claim 3, wherein a portion of said neutral potential conductor which is maintained at nominal neutral potential, is wound about said transformer so that the last-mentioned portion constitutes said secondary winding of the transformer.
Claim 11
Dependent Claim
49 words
A communications device as claimed in claim 1, wherein said neutral potential conductor is an internal ''''ground-return'''' conductor which is maintained at the nominal neutral potential, a portion of said ''''ground-return'''' conductor being wound about said transformer so that the last-mentioned pOrtion constitutes the secondary winding of said transformer.
Claim 12
Dependent Claim
50 words
A communications devices as claimed in claim 1, wherein said cable is provided with an external mechanically supporting conductor which is maintained at the nominal neutral potential, a portion of the last-mentioned conductor being wound about said transformer so that the last-mentioned portion constitutes the secondary winding of said transformer.
Claim 13
Dependent Claim
28 words
A communications device as claimed in claim 1, wherein said transformer secondary winding is electrically connected to the shield of the cable in proximity to said terminal facility.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |