Abstract: A signal shielding structure for a cable, such as an audio cable, employs 1) a shielding sheath which is electrically insulated from and encloses the signal-carrying conductors in the cable and 2) one or two discrete inductors electrically coupled between selected discrete points of termination on the shielding sheath and selected ground points to provide a d.c. signal path to ground and to inhibit ground termination of r.f. signals. The shielding sheath floats and is preferably everywhere electrically isolated from direct-wire connection with all grounds and all signal sources except for the connection through the inductor or inductors.

Abstract: In audio frequency high fidelity equipment, termination plugs for input ports and output ports of various types wherein the termination plugs include a conductive-film-covered ferromagnetic-core electrical damping element inductively coupled to potential signal carrying components. In an unbalanced configuration, an RCA-type plug may include a shorting loop between the center conductor and the shield wherein a loop or coil of conductively-clad ferromagnetic material is disposed around the shorting conductor forming a transformer circuit, the cladding being a shorted secondary. The cladding is a film of copper, gold or silver, which is preferably covered with electrical insulation.

Abstract: An interconnection cable for audio frequency high fidelity applications, such as loudspeakers, is provided wherein a first wire and a second wire extend between a reference end and a terminal end, the second or auxiliary wire being divided into two serial segments by a single electrical discontinuity separating each segment, wherein each segment is conductively terminated at its respective end in a signal common or ground with the first wire, and wherein the electrical discontinuity is at between 9/16 and 23/32 of the distance from a reference end. Multiple interconnection cables may be assembled into balanced transmission lines for a signal path and a signal return. It is preferable that the reference end be at the signal source and the terminal end is at the signal load.

Abstract: An interconnection cable for audio frequency high fidelity applications comprises a first and a second conductor which are disposed close to one another and connected at the ends, wherein the second conductor has an electrical length which is a least three times longer than the first conductor. The second conductor is helically wound about the first conductor. A third conductor may be included in the space within the helical winding, and in one embodiment may be connected at the ends of the first and second conductor. In another embodiment, the third conductor may be insulated from the first conductor and the second conductor for signal return.

Abstract: An interconnection cable for audio frequency high fidelity applications is provided wherein a conductive shielding is a sheath which is divided into two segments, wherein the sheath surrounds at least one signal-carrying conductive lead from which the shield is insulated, wherein the sheath has a single electrical discontinuity separating each segment of the sheath, wherein each segment of the sheath is conductively terminated at its respective end of the cable in a signal common or ground, and wherein the electrical discontinuity is at between 9/16 and 23/32 of the distance from a reference end and preferably at between 5/8 and 2/3 of the distance from the reference end. It is preferable that the reference end is at the signal source and the other end is at the signal load.

Abstract: An apparatus for minimizing degradation of fidelity of a signal in a transmission line intended for carrying signals of wavelengths greater than the length of said transmission line and wherein the signals are of frequencies over several octaves, wherein a structure of ferromagnetic material is employed encircling a transmission line and the ferromagnetic material, preferably a toroid, serves as core to a transformer with a secondary having a termination in a substantially short circuited load whereby ringing signals in the transmission line are dissipated in the secondary circuit. Therefore, the invention causes the frequency response of a cable to be umimpaired for the desired signal, and it simultaneously and selectively couples the undesired reflection currents into a secondary circuit where they are dissipated.