US 6,272,318 B1Granted

Pager capable of automatically switching and setting a plurality of transmission speeds

AssigneeNEC Corporation

InventorKenji Yoshioka

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Abstract

In a pager, one of a plurality of kinds of baud rates is automatically selected for each of the service areas or network providers. With this provision, the conventional operation to produce pagers for the respective transmission speeds becomes unnecessary, which resultantly improves productivity as well as operability and usability thereof. The pager includes an antenna, a radio section, a demodulating section, a low-pass filter, a comparator, a decoder, a CPU, a notifying section, a ROM, a RAM, and a switching circuit. Receiving a broadcast radio wave, the pager produces a demodulated signal therefrom. In accordance with the demodulated signal, the pager automatically sets operation of the decoder to either one of a plurality of transmission speeds of the received signal and conducts a paging operation when a paging number of the received signal matches a paging number beforehand stored therein.

Claims19

Dependent claims

A pager for use with a radio paging network on which digital data is transmitted at one of a plurality of baud rates on a modulated broadcast radio wave, the pager comprising:

a reception processing sub-system that produces a demodulated paging signal from an incoming broadcast radio wave and converts the demodulated paging signal to a digital data stream;
a paging sub-system that processes the digital data stream to perform a paging operation, the paging subsystem including:
a frequency detection circuit which directly measures the bit rate of the digital data stream to generate an identification signal representing the baud rate of the received paging data;
an operating mode selection circuit which responds to the identification signal to set an operating mode for paging operations at the baud rate of the received paging data;
and
a signal processing section which responds to the digital data stream and the selected operating mode to conduct a paging operation when the paging number received as part of the data stream matches a pre-stored paging number identifying the pager.

3 more elements

Dependencies are inferred from the claim text.