| 摘要 |
The system uses the telephone system to control the operation of the radio receiver. The cellular radio system for use in a vehicle includes a receiver circuit (20) for information broadcast by a radio network station (3), and also a further receiver circuit (17) detecting signals broadcast on a cellular GSM telephone network (2). Information is received via the GSM network in order to control the operation of the radio receiver, such that the radio receiver can be automatically tuned to the local broadcast frequency for the required radio station. The radio receiver includes an input amplifier (21) followed by a mixer (23) for frequency transposition controlled by a local oscillator. The output to the loudspeaker is provided by a passband amplifier (24).
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