Telecommunications – Receiver or analog modulated signal frequency converter – Plural output
Patent
1995-10-03
1998-07-14
Hudspeth, David R.
Telecommunications
Receiver or analog modulated signal frequency converter
Plural output
381 86, H04M 1100, H04Q 700
Patent
active
057818509
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a live voice device, particularly useful for cellular telephones in motor vehicles.
As it is known, in recent times, use of cellular telephones in motor vehicles is achieving a widespread diffusion.
Cellular telephones presently used can be mounted on motor vehicles and can be provided with a so-called live voice device, designed in order to let the driver freely talk without using his/her hands, so as to enable him/her to contemporaneously drive the motor vehicle in full safety conditions.
It is also known that many presently circulating motor vehicles are usually equipped with a car radio receiver provided with a "tape player" or a "cassette player" in order to enable the driver and the passengers to listen to the radio programs or to music recorded on magnetic tapes by means of electro-acoustic transducers, such as loudspeakers, at an acoustic intensity (volume) as desired by the listener.
In view of the above, it can be easily understood that any live voice devices for use with cellular telephones should be housed within the dashboard of the vehicle, thereby resulting into noticeable encumbrance and often into aesthetic inconveniences.
Furthermore, when the driver is listening to the car radio receiver and desires to make or to receive a phone call, he/she is obliged to effect rather dangerous manoeuvres due to the fact that, in addition to driving the vehicle, he/she should lower the acoustic volume of the car radio receiver and subsequently enable the cellular telephone apparatus for instance by pressing a button.
In addition to the inherent hazards and difficulties of the above mentioned manoeuvres, it is clear that a live voice device of the already known construction, in addition to a noticeable encumbrance, is rather expensive, due to the fact that it should include all electronic circuitry needed for handling the low frequency and low power telephonic signals, in particular at least a pre-amplifier stage, designed to rise the telephonic signal to a level at least sufficient to enable its subsequent power amplification, thereby making it suitable for being reproduced by means of loudspeakers.
It is an object of this invention to eliminate the drawbacks of the prior art and to propose a live voice device, in particular for use with cellular telephones in motor vehicles, which utilizes for its operation the electronic circuitry already existing in a car radio receiver or at least a portion thereof, so as to let the dashboard of the vehicle to remain to the maximum possible extent unencumbered.
In the frame of this problem, it is an important object of this invention to propose a live voice device adapted to utilize in its operation the acoustic loudspeakers already existing in the vehicles and connected to the radio receiver apparatus thereof.
It is a further object of this invention to propose a live voice device adapted to permit to automatically utilize for its operation a single apparatus (a radio receiver apparatus) both for listening to the radio programs or to recorded music and for using the cellular telephone, and which at the same time supplies the electric power needed for operation of the telephone, without discharging its batteries.
It is a still further object of this invention to propose a live voice device adapted to automatically reduce or completely null the acoustic volume of the car radio apparatus, should the cellular telephone apparatus be enabled to receive or to effect a call.
It is a still further object of this invention to propose a live voice device capable to eliminate the need to mount additional loudspeakers and environmental microphones and adapted to utilize at the same time further additional apparatus, such as a telephone answering device, electronic outputs for fax reception and computer connections, as well as the possibility to use a masking device for the telephonic conversation.
This problem is solved and the above and other objects are fulfilled by means of a live voice device particularly for cellular telephone apparatus for motor
REFERENCES:
patent: 4691361 (1987-09-01), Yoshino et al.
patent: 4734897 (1988-03-01), Schotz
patent: 5161131 (1992-11-01), Borchardt et al.
Luzzio Carmelo
Ugge' Giuseppe
Hudspeth David R.
Krateia S.r.l.
Richardson Scott
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