Electrical audio signal processing systems and devices – Vehicle
Patent
1992-02-19
1993-09-07
Isen, Forester W.
Electrical audio signal processing systems and devices
Vehicle
381 94, 381110, H04B 100
Patent
active
052436594
ABSTRACT:
An improved motorcycle intercom communications system between the motorcycle driver and passenger providing for stereo of listening from a radio, cassette player, or the like in each of both right and left helmet speakers wherein intercom communications may be had through microphones always activated located proximate the mouth of both driver and passenger, where when initiating speaking over the microphone, the stereo output of both right and left speakers of the driver's and passenger's helmets is terminated completely and the intercom conversation is heard in full. Upon the termination of the intercom conversation, the invention circuitry returns both sides of speakers to the pre-existing level of stereo output. The above is accomplished by dividing all sounds which come in over the microphone into a low frequency range and an audio speaking range wherein the output of a low frequency range filter is constantly sampled and compared with the energy output of the audio speaking range of frequencies. When the energy in the speaking range of frequencies exceeds the energy in the low frequency range, such is indicative that a party is speaking into the microphone and the circuit automatically terminates the output to both helmet speakers and injects the intercom on the helmet speakers.
REFERENCES:
patent: 3623064 (1971-11-01), Kagan
patent: 3811012 (1974-05-01), Barber
patent: 4297677 (1981-10-01), Lewis
patent: 4380824 (1983-04-01), Inoue
patent: 4421953 (1983-12-01), Zielinski
patent: 4677389 (1987-06-01), Op de Beek
patent: 4754486 (1988-06-01), Stafford
patent: 4941187 (1990-07-01), Slater
Lazzeroni John J.
Stafford Larry E.
Carevich Melinda K.
Isen Forester W.
Lazzeroni John J.
McClanahan J. Michael
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