Abstract A telephone system on the vehicle comprises a detachable handset (13) including a microphone (26) and speakers (28), a pad (12) positioned near a vehicle driver for containing the detachable handset, an amplifiers for amplifying a voice signal from the microphone (31), a position detector for detecting a distance between the handset and the pad, and, a gain controller for controlling a gain of the amplifiers in response to the distance detected by the position detector. When the handset is contained in the pad, the position detector detects that the handset is positioned near the pad. At this time, the gain controller increases the gain of the amplifiers, and consequently, the voices from the vehicle driver is clearly received. Therefore, a vehicle passenger especially the driver can use the telephone system under grasping a steering wheel with both hands. When the handset is put off from the pad, the position detector detects that the hand set is positioned remotely from the pad. At this time, the gain controller decreases the gain of the amplifiers, and consequently, the vehicle passenger except for the driver can use the telephone system as same as a telephone system in a home.
(1) A telephone system on a vehicle comprising: a detachable handset including a microphone and a speaker; containing means positioned near a driver for containing said detachable handset; amplifying means for amplifying a voice signal from said microphone, position detecting means for detecting a distance between said handset and said containing means; and; gain controlling means for increasing a gain of said amplifying means in response to said distance detected by said position detecting means.
Claim 2
Dependent Claim
46 words
(2) A telephone system on a vehicle according to claim 1, wherein said handset comprises; a first speaker for emitting a voice loudly; a second speaker for emitting a voice in a whisper; and; a selecting means for selecting one of said first and second speakers.
Claim 3
Dependent Claim
38 words
(3) A telephone system on a vehicle according to claim 1, wherein said containing means comprises: a steering wheel; a pad portion provided on a centre of said steering wheel; and; a groove provided on said pad portion.
Claim 4
Dependent Claim
47 words
(4) A telephone system on a vehicle according to claim 1, wherein said amplifying means comprises: a first channel for amplifying said output signal of said microphone with a first gain; and; a second channel for amplifying said output signal of said microphone with a second gain.
Claim 5
Dependent Claim
49 words
(5) A telephone system on a vehicle according to claim 1, wherein said position detecting means comprises; a first contacting means provided on said handset; and; a second contacting means provided on said containing means for contacting said first contacting means and supplying a electric power to said handset.
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