H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/19
H04B 1/44 (2006.01) G08B 25/00 (2006.01) H04B 1/38 (2006.01)
Patent
CA 1051521
ABSTRACT OF THE DISCLOSURE For use in a vehicle having radio equipment including at least a microphone and a transmitter, apparatus including a second microphone and an adapter for connecting both of said microphones to the transmitter. Switching means are arranged for selectively operating the second microphone, with the switching means and second microphone being disposed for operation without compromising vehicle control and for operation during a distress situation such as a hold-up or the like. Circuitry is provided for enhancing operation of the apparatus by providing timing, amplification, noise suppression and impedance matching functions.
229714
Guadara Joseph G.
Wesserling William R.
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