Patent US3711660A successfully refreshed from Google Patents.
US3711660A
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Hybrid networks
Assignee: Monash University
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Filing: 1970-12-01
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Granted: 1973-01-16
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Expires: 1990-12-01
Abstract
Abstract The disclosure of the present specification relates to a bridge network suitable for use as a telephone hybrid wherein the bridge network includes at least two bridge networks in cascade, one bridge having arms which include the input and bidirectional ports of the hybrid and the nominal balancing impedance, the other sub-bridge network having arms which include the output port of the hybrid and the output circuit of an amplifier having an output signal characterized by a product of the signal applied to the input port of the hybrid and the signal from the output of the hybrid, the output circuit thereby being isolated from arms in the output port and from all other arms of the bridge which include reactive elements or characteristics.
Inventors
- 👤 E Cherry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:03
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H04B1/58; H04B1/583; H04M; H04M9/00; H04M9/08
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
70 words
A bridge network in which a first arm includes a first signal generator, a second arm includes both a first load impedance and a second signal generator, a third arm includes a second load impedance, and a fourth arm includes a third signal generator having an output signal which is characterized by a product between the signal from said first signal generator and the signal across said second load impedance.
Claim 2
Dependent Claim
70 words
A bridge network in which a first arm includes a first signal generator, a second arm includes both a first load impedance and a second signal generator, a third arm includes a second load impedance, and a fourth arm includes a third signal generator having an output signal which is characterized by a product between the signal from said first signal generator and the signal across said second load impedance.
Claim 3
Dependent Claim
21 words
The bridge network according to claim 1, wherein said third signal generator includes a multiplying circuit for obtaining said signal product.
Claim 4
Dependent Claim
34 words
An improved hybrid comprising a bridge network according to claim 2, wherein said first arm includes the input port, said second arm includes a bidirectional port, and said third arm includes the output port.
Claim 5
Dependent Claim
26 words
The improved hybrid according to claim 3, wherein the impedance of one arm of said bridge network is so chosen as to approximately balance the hybrid.
Claim 6
Dependent Claim
44 words
The improved hybrid of claim 3 wherein said third signal generator is connected in an arm of said bridge network and wherein said bridge network is balanced such that the output signal from said third signal generator does not flow in said bidirectional port.
Claim 7
Dependent Claim
69 words
The improved hybrid according to claim 3 wherein said third signal generator is connected in an arm of said bridge network and wherein said bridge network is balanced such that the output from said third signal generator does not flow in any arm in which the peak energy stored is greater than one tenth of the energy dissipated per cycle at a signal frequency of the first signal generator.
Claim 8
Dependent Claim
141 words
The hybrid network according to claim 3 wherein the output of said third signal generator is defined by ia ii vo/UT wherein ii is the signal presented to the input port, vo represents the signal of the output port and UT is the transfer constant of said multiplying circuit; said bridge circuit comprising a Wheatstone bridge of six arms, such that the voltage signal at the bidirectional port is represented by the expression: ii ( 1/2(G+G'') ) + ib ( 1/G+G'' ) wherein ib is the signal applied to the bidirectional port, G is the conductance of five of the six arms and G'' is the arbitrary conductance of the bidirectional port; the voltage signal at the output port being represented by the expression: ( ii/G+ ii /4UT ) ( G-G''/8(G+G'') ) + ( ib/G+ ii /4UT ) ( G/2(G+G'') )
Claim 9
Dependent Claim
67 words
The improved hybrid according to claim 7 wherein the bridge network comprises at least two bridge networks coupled from an input of one to an output of the other, one bridge network having arms which include the input and bidirectional ports of the hybrid and the balancing impedance, the other bridge network having arms which include the output port of the hybrid and said third signal generator.
Claim 10
Dependent Claim
44 words
The improved hybrid of claim 8 wherein said third signal generator is connected in an arm of said bridge network for which said bridge network is so balanced that the output signal from said third signal generator does not flow in said bidirectional port.
Claim 11
Dependent Claim
70 words
The improved hybrid according to claim 8 wherein said third signal generator is connected in an arm of said bridge network for which said bridge network is so balanced that the output signal from said third signal generator does not flow in any arm in which the peak energy stored is greater than one tenth of the energy dissipated per cycle at the signal frequency of the first signal generator.
Claim 12
Dependent Claim
69 words
The improved hybrid according to claim 8 wherein the other bridge has four appropriate arms constituted by resistive elements and is balanced so that the output signal of said third signal generator does not flow in the bidirectional port or in any arm in which the peak energy stored is greater than one tenth of the energy dissipated per cycle at the signal frequency of the first signal generator.
Claim 13
Dependent Claim
64 words
A bridge network in which a first arm includes a first signal generator, a second arm includes both a first load impedance and a second signal generator, and a third arm includes the input circuit of a continuously variable attenuator having its output connected to a second load impedance, said attenuator having its loss factor controlled by the signal from said first signal generator.
Claim 14
Dependent Claim
64 words
A bridge network in which a first arm includes a first signal generator, a second arm includes both a first load impedance and a second signal generator, and a third arm includes the input circuit of a continuously variable attenuator having its output connected to a second load impedance, said attenuator having its loss factor controlled by the signal from said first signal generator.
Claim 15
Dependent Claim
38 words
An improved hybrid comprising a bridge network according to claim 12 wherein said arm includes the input port, said second arm includes the bidirectional port, and said second load impedance includes the impedance connected to the output port.
Claim 16
Dependent Claim
26 words
The improved hybrid according to claim 13 wherein the impedance of one arm of the bridge network is so chosen as to approximately balance the hybrid.
Claim 17
Dependent Claim
44 words
The improved hybrid according to claim 13 wherein the ratio of output voltage to input voltage of the attenuator is represented by 1/1+ ii /JT wherein JT is a transfer constant of the attenuator and ii is the signal presented to the input port.
Claim 18
Dependent Claim
28 words
The bridge network according to claim 2 wherein an input signal to the amplifier circuit is time averaged over a period of the order of one speech waveform.
Claim 19
Dependent Claim
27 words
The bridge network according to claim 12 wherein the control signal to the attenuator is time averaged over a period of the order of one speech waveform.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |