Nokia Mobile Phones Limited

Aki Leppanen

Risto Vaisanen

Toivo Vilmi

Tapio Parkas

Jukka Solla

Hands free equipment for mobile phones, has 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.

Hands free equipment

A carrying device which is used together with a mobile station and with which the mobile station can be attached to a target and detached from the place of attachment and re-attached to it. The attachment device comprises a support stud (2) attached to a mobile station (10) and a carrying device (1) attached to a target by way of an attachment element (5), including gripping elements for a detachable grip on the support stud. The gripping elements of the carrying device comprise guide grooves (8) for the reception of the support stud (2) and a tongue (7) moving transversely (6) against the plane (4) of the guide grooves and held by a spring (13) in a locking position (L) extending across the plane of the guide grooves. The carrying device has a hand-operated slide (27) which includes an element (12) to force the tongue against a spring force (F) off the position extending across the plane of the guide grooves, thereby moving it into a release position (R) which releases the support stud.

Carrying device for mobile station

Hands free equipment for mobile phones, has 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.

In a method according to the invention the tuning information determined by a measuring computer (20) is stored in the memory of the radio telephone (1). In operation the microprocessor (10) receives from the sensors (14) information e.g. about the temperature, according to which it selects from its memory tuning data and adjusts signal levels and deviations through logic controlled amplifiers (16, 17). The tuning can be made automatically, without opening the casing of the radio telephone.

Logic controlled tuning signal level and deviation compensation in a

In the method of tuning the received signal strength indicator the tuning results for selected operating conditions are stored in the microprocessor (10) memory. When the radio telephone (1) is in use, the received signal strength indicator (RSSI) reading is corrected with the tuning result in order to select the strongest antenna signal. The tuning is performed by connecting the tuning equipment (2)to the external interfaces (31, 32) of the radio telephone without opening it.

Method of tuning and compensating the received signal strength indicator

Radio telephone tuning information is determined by a measuring computer (20) stored in the memory of the radio telephone (1). A microprocessor (10) receives from the sensors (14) information about the operating temperature, according to which appropriate tuning data is selected from memory. The information is used to adjust signal levels and deviations through logic controlled amplifiers (16, 17). The tuning can be made automatically without opening the casing of the radio telephone.

In accordance with the invention a radio telephone (1) is tuned so that the tuning equipment (2) selects the signal (S1, S2) to be tuned via the microprocessor (10) and the multiplexer (13), and that the logic controlled amplifiers (11, 11') are controlled to obtain the desired tuning result. The set values corresponding to the tuning result are stored in the microprocessor memory. When the radio telephone is in operation, the signals are amplified in accordance to the set values. The tuning can be performed without opening the radio telephone.

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Salo, Finland

Aki Leppanen