Audio signal source balancing adapters

Details Audio signal source balancing adapters Audio signal source balancing adapters

1995-01-18

1997-10-14

Kuntz, Curtis

Electrical audio signal processing systems and devices

One-way audio signal program distribution

333 25, 333 32, H04B 300, H03H 738

Patent

active

056779593

ABSTRACT:
An audio signal source balancing adapter provides connection between an unbalanced audio source and a balanced input amplifier of an audio processing instrument, such as an audio mixer panel, with a variable resistor in the cold line, so the input impedance may be matched by adjusting the variable resistor until "hum" disappears at the audio processing instrument. In one embodiment the balancing adapter has a mono plug at one end of a shielded cable and a stereo plug at the other, with a variable resistor, such as a rotary potentiometer, mounted in a housing at the mono plug. In another embodiment, a single housing has a mono plug in one wall of the housing and an XLR connector in another, with a rotary potentiometer within the housing, and wired to provide a balancing impedance in the cold line between the connectors. In yet another embodiment, an adapter box is provided wherein several inputs may be plugged into receptacles at the box using standard mono plug cables, and each of the inputs may be output via associated XLR connectors and XLR cables going to balanced inputs of an audio instrument.

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patent: 5585767 (1996-12-01), Wright, Jr.
Interference Handbook, William R. Nelson, 1981, pp. 128-130.

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