Mobile radio telephone system
AssigneeHitachi, Ltd.
InventorMitsuo Toya
Life of this patent
Estimating the term…
Abstract
A vehicle radio telephone system includes, in addition to a handset associated with a telephone set, a wireless microphone detachable from the telephone set and a telephone receiver comprising a speaker contained in the telephone set. When a driver drives a vehicle, the wireless microphone is placed near the driver's mouth so that the driver can transmit and receive without handling the handset.
Claims5
A mobile radio telephone system including a telephone set which is capable of communicating with an external telephone subscriber through a mobile radio station, said telephone set comprising:
- a wireless telephone transmitter energized and enabled to transmit a signal when said wireless telephone transmitter is detached from said telephone set;
- a transmitter/receiver circuit for receiving a transmitted signal from said wireless telephone transmitter, transmitting the received signal to said external telephone subscriber through a switch and said mobile radio station and receiving a transmitted signal through said mobile radio station and said switch from said external telephone subscriber;
- a speaker coupled to said transmitter/receiver circuit for reproducing said signal received from said external telephone subscriber into sound;
- a handset for transmitting a signal to said external telephone subscriber through said switch and said mobile radio station and receiving a transmitted signal through said mobile radio station and said switch from said external telephone subscriber thereby reproducing the received signal into sound;
- and
- said switch being controlled by a hook switch of said telephone set in response to said handset being on or off-hook for connecting said mobile radion station to said handset when said handset is off-hook and to said transmitter/receiver circuit when said handset is on-hook, whereby a driver of a vehicle can communicate with said external telephone subscriber while driving the vehicle either with said handset being on or off-hook.
A mobile radio telephone system including a telephone set which is capable of communicating with an external telephone subscriber through a mobile radio station, said telephone set comprising:
- a wireless telephone transmitter automatically energized and enabled to transmit a signal when said wireless telephone transmitter is detached from said telephone set;
- a receiver circuit for receiving said transmitted signal from said wireless telephone transmitter and transmitting the received signal to said external telephone subscriber through said mobile radio station;
- an amplifier circuit for receiving and amplifying a transmitted signal applied from said external telephone subscriber through said mobile station;
- a speaker coupled to said amplifier circuit for reproducing said signal received from said external telephone subscriber into sound;
- a handset for transmitting a signal to said external telephone subscriber through said mobile radio station and receiving a transmitted signal from said external telephone subscriber through said mobile radio station thereby reproducing the received signal into sound;
- a first switch for connecting an input of said mobile radio station to an output of said receiver circuit and a transmitter of said handset in response to on-hook and off-hook of said handset respectively;
- and
- a second switch for connecting an output of said mobile radio station to an input of said amplifier circuit and a receiver of said handset in response to on-hook and off-hook of said handset respectively, whereby a driver of a vehicle can communicate with said external telephone subscriber while driving the vehicle either with the handset being on or off-hook and the received signal from said external telephone subscriber is prevented from being transmitted from said speaker to said wireless telephone transmitter when said handset is on-hook.
Dependencies are inferred from the claim text.