H - Electricity – 04 – R
Patent
H - Electricity
04
R
349/28
H04R 25/02 (2006.01)
Patent
CA 1236559
ABSTRACT OF THE DISCLOSURE A hearing aid apparatus has a housing containing components such as a microphone, an amplifier and an earphone, and to which a terminal having contacts for connection to a signal line is applied. The terminal also has contacts for derivation of signals from the microphone so that a conventionally operating hearing aid is achieved which also contains an audio output in addition to an audio input. The hearing aid apparatus is thus particularly suitable for use as a talk/listen set in aural training systems.
457813
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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