Device for connecting external sound generator

Details Device for connecting external sound generator Device for connecting external sound generator

1994-08-16

1997-06-24

Kuntz, Curtis

Electrical audio signal processing systems and devices

Binaural and stereophonic

Hearing aid

381 1, 330149, 330306, H04R 500

Patent

active

056424248

ABSTRACT:
A device for connecting an external sound generator having a plug and being incorporated in an apparatus having a circuit outputting an electrical sound signal. The external sound generator is, for instance, either one of a headphone having the plug of 3-pole stereophonic type or a earphone having the plug of 2-pole monophonic type. The device comprises a single jack having a first and second plus contacts and a minus contact for receiving the electrical sound signal from the outputting circuit through the first plus contact and for supplying the electrical sound signal to the plug connected to the jack and an impedance element, such as a electric resistor, connected between the first and second plus contacts. The impedance element prevents a short circuit for use of an earphone having a 2-pole monophonic plug.

REFERENCES:
patent: 4433209 (1984-02-01), Kurosawa et al.
patent: 5001774 (1991-03-01), Lee
Radio Shack, Linear Applications, vol. 1, Dec. 1972, pp. AN69-1-AN69-7.

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