Hands free equipment for a mobile telephone

Abstract: Hands free equipment for mobile phones, comprising an extra loudspeaker and microphone and an electronic unit included therein, the equipment being mainly intended for use in cars, whereby driving safety is maintained. The equipment is connected to the charger of the cigarette lighter. The hands free equipment according to the invention consists of a separate, small-sized, detachable and movable unit situated outside the mobile phone.

Description: This invention relates to hands free equipment for use with a radio telephone, the equipment being suitable for use in automobiles. Known hands free (HF) equipment are disclosed in patent publications WO 92/14328 and GB 2 206 765. This invention is intended to further develop the HF equipment to provide a cheaper, simpler and more portable solution. The HF equipment in accordance with the invention comprises a separate, small-sized, detachable and transferable unit located outside the radio telephone. The HF equipment does not use the radio telephone's internal microphone as that requires modification of the software and the couplings within the telephone. The HF microphone in accordance with the invention, when compared to the radio telephone microphone, is a different type, is of higher quality and has a different directional sensitivity. Suitably the HF microphone apparatus also compensates for any background noise. In current known radio telephones the HF facility is implemented either fully or partially within the telephone. Thus only the HF microphone, the amplifier, the loudspeaker and the amplifier for the loudspeaker are outside the telephone. The HF equipment in accordance with the invention is further provided with a facility for charging the radio telephone. The HF equipment can also be used in existing radio telephones by altering the bottom coupler connection to suit each model. According to the present invention, there is provided hands free equipment for use with a portable radio telephone comprising: a first connector for detachably connecting the hands free equipment to a connector of the portable radio telephone; a second connector for detachably connecting the hands free equipment to a cigarette lighter socket; and a lead connecting the first and second connectors, characterised in that the first connector includes a microphone, and the second connector includes a loudspeaker. Hands free equipment in accordance with the invention has the advantage that it provides a single apparatus solution for using a portable telephone in hands free mode. The lead is detachable from the radio telephone and the cigarette lighter socket. This has the advantage of allowing the hands free equipment to be portable such that it may be carried in the pocket. Suitably the lead of the hands free equipment also serves as a means for charging the telephone from a power supply in the cigarette lighter socket, typically found in an automobile. Ideally, the speaker and the microphone of the hands free equipment is housed in the cigarette lighter charger and the system connector respectively. This has the advantage of reducing the number of separate components of the hands free equipment and consequently provides a simpler solution that may reduce manufacturing costs. By locating the speaker in the housing of the cigarette lighter charger, the speaker may also be provided with an amplifier. The advantage of this arrangement is that the amplifier may be powered from the charging circuitry and thus does not impose any load on the radio telephone battery. The hands free equipment of fig. 1 comprises a radio telephone charger unit, for connection to a cigarette lighter socket (i.e. a cigarette lighter charger), provided with a loudspeaker and a microphone coupled to the cigarette lighter charger and an electronic unit situated inside the radio telephone. This HF equipment is particularly small, easy to move, advantageous to implement and can be carried in a pocket. The hands free equipment of fig. 2 comprises a loudspeaker and a microphone coupled to the system connector of the mobile phone and an electronic unit situated inside the radio telephone. This embodiment is a slightly more expensive solution compared to the former because it comprises an extra part. The hands free equipment of fig. 3 comprises HF equipment with a loudspeaker and a microphone, using the charger electronics of the cigarette lighter charger, to the wire between the cigarette lighter charger and the radio telephone, and includes an electronic unit situated inside the radio telephone. In this embodiment the coupler to the cigarette lighter socket is small and fits most cars without difficulty. The position of the loudspeaker is movable. If the loudspeaker is enclosed, the cables with their connectors and the microphone with its cables can be placed within it tidily. It is easy to further attach the enclosed loudspeaker to different places in the car: for example, it can be suspended on the coupler of the cigarette lighter and secured in a suitable, desired place using a Velcro tape. The hands free equipment of fig. 4 comprises a loudspeaker and a microphone coupled to the system connector of the telephone using a threaded cable and an electronic unit placed inside the radio telephone. This embodiment also comprises two products and, consequently, is slightly more expensive to manufacture. One embodiment of the invention comprises the loudspeaker placed in the housing of the cigarette lighter charger and a microphone placed in the housing of the system connector for the radio telephone. This embodiment results in a very small HF equipment and if two smaller loudspeakers are used in the charger part on either side of the contact surfaces instead of one larger element, an even smaller size can result. The radio telephone is placed in the HF mode by making a call when the telephone is in its holder. When the telephone is picked up by hand, the audio lines of the telephone are directed to the telephone's internal microphone and receiver. The directing element can be a Hall-sensor inside the telephone (a "cold" rack can be made) or a switch connected to the coupler part. The invention will now be described, by way of example, with reference to the accompanying drawings, in which: Fig. 1 shows a loudspeaker 1 situated in a cigarette lighter charger 2. Microphone 3 is coupled to the cigarette lighter charger 2. The electronic unit is placed inside radio telephone 4. Fig. 2 shows a loudspeaker 1 and a microphone 3 coupled to a system connector in the base of radio telephone 4. The electronic unit is situated inside mobile phone 4. This embodiment employs the present cigarette lighter charger 2. Fig. 3 shows HF equipment with its loudspeaker 1 and microphone 3, using the electronics of the cigarette lighter charger 2, coupled to the wire between the cigarette lighter charger 2 and the radio telephone 4. The electronic unit is inside the radio telephone 4. Fig. 4 shows a loudspeaker 1 and a microphone 3 coupled to the system connector in the base of the radio telephone 4 using a cable. The electronic unit is situated inside the radio telephone 4. Fig. 5 shows a loudspeaker 1 situated in the housing of the cigarette lighter charger 2. Microphone 3 is situated in the housing of the system connector located in the base of radio telephone 4. The electronic unit in this embodiment is also situated inside the radio telephone 4. If an external antenna is used, the antenna coupling can be taken from the coupler located on the base of the radio telephone 4 or from the side of the cigarette lighter charger after the threaded cable.

Claims: Hands free equipment for use with a portable radio telephone (4) comprising: a first connector for detachably connecting the hands free equipment to a connector of the portable radio telephone; a second connector for detachably connecting the hands free equipment to a cigarette lighter socket; and a lead connecting the first and second connectors, characterised in that the first connector includes a microphone (3), and the second connector includes a loudspeaker (1). Hands free equipment as claimed in claim 1, wherein the second connector comprises means for supplying power to the hands free equipment from the cigarette lighter socket. Hands free equipment as claimed in claims 1 or 2, wherein the second connector is provided with charging circuitry for charging the radio telephone. Hands free equipment as claimed in any one of claims 1 to 3, wherein the second connector comprises amplifying means for the loudspeaker. Hands free equipment as claimed in claim 4, wherein the power for the amplifying means is provided from the cigarette lighter socket.

Inventors: LEPPAENEN AKI, VILMI TOIVO, LEPPAENEN, AKI, VILMI, TOIVO, Leppänen, Aki
Applicants: NOKIA CORP, NOKIA CORPORATION
Application year: 1995
Main classification: H04M1
IPC codes: H04M1, H04B1