Telephone transmission system on a road-vehicle

Details Telephone transmission system on a road-vehicle Telephone transmission system on a road-vehicle

1982-11-10

1984-06-19

Pitts, Harold I.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

381 86, 455 88, 455 89, H04M 123

Patent

active

044554540

ABSTRACT:
Branch telephone connection control signal communication between a dialling control board mounted on a steering wheel but held in a stationary state irrespective of a rotation of the steering wheel and an electric controller disposed at a position remote from a steering mechanism, the electric controller is connected to a mobile telephony device on a road-vehicle. The dialling control board is supported by a steering drive shaft through a toothed wheel mechanism, so that it remains stationary regardless of a rotation of the shaft. The control board and the electric controller are electrically coupled to each other through a combination of slip rings and brushes. The dialling control board and the electric controller each include an FSK modulation circuit, an FSK demodulation circuit and a microprocessor for controlling transmission or reception of the electric signals. Key inputs on the dialling control board are encoded by the dialling control board and then transmitted to the electrical controller. The electric controller decodes the received code and then renders operation instructions to the mobile telephony device. A microphone for driver's speaking is equipped on a front panel and connected to the mobile telephony device. In another embodiment, the microphone is equipped on the dialling control board and connected to the mobile telephony device through an electric-magnetic coupling of a pair of electric coils.

REFERENCES:
patent: 4157854 (1979-06-01), Beauch

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