DE19943950A1 - Radiotelephone with an integrated clock - Google Patents

Abstract

The invention relates to a mobile telephone (1) having an integrated clock (10). Said telephone has a radio-controlled clock receiver for receiving and evaluating a synchronisation time signal for the integrated clock (10).

Description

The invention relates to a radio telephone with an inte freeze clock.

Conventional radio telephones, such as in the zellula mobile network or in the local network Cordless phones that are operated usually do not have any internal clock. Provided an internal clock in the radio telephone a quartz-controlled clock is integrated realized their accuracy through the construction used elements, especially limited by the watch quartz is. The clock must be set manually. In order to avoid that the clock after replacing the Ver care batteries for the radiotelephone or after a full constantly discharging the supply battery again is an additional battery for operation of the watch is required. For that be Button cells used, reducing the price of the radio fons increases, the function of the watch due to durability the button cell is determined, as well as problems and costs occur when disposing of old radio telephones.

A radio telephone is used to solve these problems an integrated clock that proposed a radio watch receiver for receiving and evaluating a synchro  nization time signal for the integrated clock.

The radio telephone is thus expanded in that there is a real-time transmitter, for example the transmitter DCF77 the Physikalisch-Technische Bundesanstalt Braun silence, receive and evaluate. This can the integrated clock automatically synchronizes and on be placed so that no additional battery to open maintaining clock operation is more necessary. Time zone shifts that may need to be taken into account can be entered by entering a time offset the time display.

The radio telephone advantageously has a quartz crystal controlled integrated clock by the radio clock receiver ger and a control device with the help of emp caught and evaluated synchronization time signals of the real-time transmitter is synchronized. The Synchroni sation takes place advantageously in a fixed time intervals and especially after switching on the Radiotelephones and / or after fully discharging the supply battery for the radio telephone or the An clamp a new supply battery to the radio fon after the radiotelephone for a while without one Power supply was.

The radio clock receiver consists of an antenna, a Resonant circuit and a receiver for the Synchronisa tion time signal. Advantageously, the recipient for the synchronization time signal and the receiver one unit for the radio telephone. Here, the emp catcher and the evaluation for the synchronization time signal in the baseband receiver chip of the radio telephone to get integrated. This has the advantage of being a recipient functions several times both for the radio clock receiver and also used for the receiver for the radio telephone that can.  

The invention is described below with reference to the accompanying Drawing explained in more detail. It shows:

Fig. 1 - block diagram of a radio telephone with integrated clock and radio clock receiver.

Fig. 1 shows a block diagram of a radio telephone 1 that a known transceiver part 2 has that is connected to an antenna 3 . The transmitting / receiving part 2 consists essentially of a high-frequency transmitter 4 and a Hochfrequenzemp catcher 5 , which can be adjusted with the help of a local oscillator 6 to the channel to be received. To the high frequency transmitter 4, a modulator 7 and to the radio frequency receiver 5, a demodulator 8 is connected. The modulator 7 and the demodulator 8 are formed on a control / communication circuit 9 for multiplexing or demultiplexing the received signals in the time slot, for synchronizing the signals, for channel coding or decoding and for recording and reproducing the signals. The radio telephone 1 also has a quartz-controlled integrated clock 10 , which essentially has a clock quartz.

The quartz-controlled integrated clock 10 is so ausgebil det that the time is synchronized with a synchronization Zeitsi signal. For this purpose, a radio clock receiver 11 is provided for receiving a real-time transmitter. The reception frequency for the real-time signal can, for example, be aimed at the real-time transmitter DCF77 from the Physikalisch-Technische Bundesanstalt Braunschweig. The radio clock receiver 11 is connected to a control device 12 which is designed to evaluate the synchronization time signal of the real-time transmitter and to synchronize the quartz-controlled integrated clock 10 .

In a first embodiment, the control device 12 is coupled to the control / communication circuit 9 in order to display the clock signal as the time and / or as a date or to use the clock signal for further functions of the radio telephone 1 .

In a second embodiment, not shown, the control unit 12 and the control / communication circuit 9 form a unit. This has the part before that connections or pins of the integrated scarf lines can be used multiple times.

The synchronization takes place at regular intervals, when the radio telephone 1 is switched on , when the supply battery 13 for the radio telephone 1 is replaced and / or after each charging process of the supply battery 13 for the radio telephone 1 . As a result, the integrated clock 10 synchronizes itself, so that accuracies of approx. 40 ms are possible. In addition, time changes are automatically recognized and no additional battery is required to maintain the operation of the integrated clock 10 when the supply battery 13 is replaced . In contrast to conventional radio telephones 1 with an integrated clock 10 , the radio telephone 1 thus has no additional battery for the integrated clock 10 .

The radio frequency receiver 5 for the signals of the radio telephone network can be integrated together with the radio clock receiver 11 for the synchronization time signal. Connections of the baseband receiver / transmitter chips can be used several times. For example, the functions for battery voltage measurement and temperature measurement are redundant.

The decoding of the received time signal and the synchronization of the internal clock 10 as well as the generation of a time or a date from the time signal of the internal clock 10 can be carried out with the aid of the microprocessor in the control / communication circuit 9 . This can be done, for example, by suitable programming of the control / communication circuit 9 .

The radio telephone 1 has a microphone 14 and a speaker 15 in a known manner, which are coupled to the control / com communication circuit 9 via amplifiers, not shown. The synchronization of the radio telephone 1 takes place with a quartz 16 .

Claims (7)

1. radio telephone ( 1 ) with an integrated clock ( 10 ), characterized by a radio clock receiver ( 11 ) for receiving and evaluating a synchronization time signal for the integrated clock ( 10 ). 2. Radio telephone ( 1 ) according to claim 1, wherein the radio clock receiver ( 11 ) has an antenna, a resonant circuit and a receiver for the synchronization time signal, characterized in that the radio clock receiver ( 11 ) for the Synchronisationszeitsi signal and the radio frequency receiver ( 5 ) are a unit for the signals of the radio telephone network. 3. Radio telephone ( 1 ) according to one of claims 1 or 2 with a quartz-controlled integrated clock ( 10 ), characterized by a control device ( 12 ) for synchronizing the quartz-controlled clock ( 10 ) with the evaluated synchronization Zeitsi signal. 4. radio telephone ( 1 ) according to claim 3, characterized in that the receiving and evaluating the syn chronization time signal and the synchronization of the quartz-controlled integrated clock ( 10 ) takes place at fixed time intervals. 5. radio telephone ( 1 ) according to claim 3 or 4, characterized in that receiving and evaluating the synchronization time signal and synchronizing the quartz-controlled integrated clock ( 10 ) after switching on the radio telephone ( 1 ) and / or charging a supply battery and / or by connecting a new supply battery to the radio telephone ( 1 ). 6. Radio telephone ( 1 ) according to one of the preceding claims, characterized by an offset signal for adapting the time signal of the clock to a time zone. 7. Radio telephone ( 1 ) according to one of claims 3 to 6, characterized in that the control device ( 12 ) and a control / communication circuit ( 9 ) of the radio telephone ( 1 ) are integrated together.