Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1996-09-10
1998-08-18
Wolfe, Willis R.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455341, H04Q 732
Patent
active
057971021
DESCRIPTION:
BRIEF SUMMARY
The object of the present invention is an arrangement for adapting the signal level in mobile phones according to the auxiliary device connected to the mobile phone.
Modem mobile, i.e. cellular phones enable the use of a number of different auxiliary devices connected to the mobile phone. Examples include different hands-free units, modems and telefaxes. Each separate auxiliary device requires a given audio signal level of its own in order to operate properly.
This was generally not a problem in earlier cellular phone generations because the cellular phone was designed so that generally it could use only one specific auxiliary device, whereby the audio signal level of the connection was, of course, set or adapted to the appropriate level. If, for some reason, some other auxiliary device than the one originally intended was used, it was connected to the mobile phone through special adaptation cables.
Since today, as already stated, a number of different auxiliary devices can be used in connection with mobile phones, in principle a number of different sized adaptation cables must also be provided, which naturally renders the efficient use of the system complicated. Therefore, the purpose of the present invention is to eliminate this problem and provide an arrangement which allows different auxiliary devices requiring different audio signal levels to be connected to the same cellular phone and to the same connection without using connection cables which are adapted in various ways.
In order to accomplish this object, the invention is characterized in the details disclosed in appended Claim 1. Preferred embodiments of the invention are disclosed in the dependent Claims.
The basic idea in the invention is thus that the actual mobile phone identifies the connected auxiliary device and sets the signal level of the connection to the required level on the basis of the data stored in its memory.
In this connection it must be pointed out that in one embodiment the identification of an external device is previously known, namely in the case of the type of internal or external power source connected to the mobile phone. It is namely well-known to adapt the charging of a battery according to the identified battery type, on one hand, and to also adapt given user features of the radio telephone according to the respective power source of the radio telephone. However, this known technique does not extend to the degree of presenting the idea of automatically adapting the respective audio level of the cellular phone according to the related auxiliary device.
The invention is described in the following in more detail in the form of an example and with reference to the appended drawings, in which:
FIG. 1 shows an embodiment of the adjustment according to the invention in the form of a block diagram,
FIG. 2 shows the control event of the adjustment in the form of a flow chart,
FIG. 3 shows the identification arrangement of the auxiliary device using a hook signal, and
FIG. 4 shows the identification arrangement with a serial interface.
The auxiliary devices in FIG. 1 are marked with reference numbers 1-N. The auxiliary device can also be connected to an antenna through an RF-part, as illustrated in auxiliary device 1. The auxiliary device is connected, via the mobile phone interface, to the cellular phone the parts of which are shown in the lower part of the Figure below the interface.
Microprocessor MCU of the mobile phone receives the data on the type of related auxiliary device that is connected via the interface. The microprocessor is provided with a memory in which data on the amplification respectively required has been stored beforehand, to ensure that the adaptation to the related auxiliary device is appropriate. This amplification data applies to the PCM-codec and/or the digital signal processor DSP of the mobile phone. In the block diagram, the adjustment signal of the amplification is marked from microprocessor MCU to both the PCM-codec and the digital signal processor DSP. According to the block diagram the followin
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Hallikainen Jyrki S.
Kattilakoski Matti H. M.
Korkeakangas Pekka H. M.
Nokia Mobile Phones Limited
Wolfe Willis R.
LandOfFree
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