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US 4,905,270 AGranted
Vehicular hands-free telephone system
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorHideyo Ono
Life of this patent
Estimating the term…
Abstract
A voice of user is picked up by a microphone built in a sun visor of a vehicle. The output of microphone is frequency-modulated by an FM transmitter powered by a solar battery and transmitted through a transmitting antenna in a vehicle. The frequency-modulated radio signal is received and demodulated by a receiver with a receiving antenna. The received signal is further transmitted outside of the vehicle through a transceiver.
Claims14
A vehicular hands-free telephone apparatus comprising
- a microphone for converting an acoustic signal to an electrical signal,
- an FM transmitter for generating a frequency-modulated radio signal in response to the output of said microphone,
- a transmitting antenna for transmitting in a vehicle said radio signal generated from said FM transmitter,
- a solar battery for converting light energy to electrical energy and providing operation power to said FM transmitter, said solar battery being mounted on a windshield of said vehicle,
- a receiving antenna for receiving said radio signal transmitted from said transmitting antenna,
- a receiver for receiving and frequency-demodulating said radio signal received by said receiving antenna, and
- a transceiver for transmitting the output of receiver outside of said vehicle,
- wherein said microphone, transmitting antenna and FM transmitter are built in a sun visor of said vehicle.
5 more elements
Dependencies are inferred from the claim text.