Radio paging system with different transmission speeds and receiver

Abstract

A paging system includes a receiver adapted for receiving paging signals at a fixed bit rate of N.multidot.R where N is an integer and R is a basic bit rate. A transmitter transmits at the N.multidot.R bit rate, N being adjustable to accommodate any signal for any particular receiver. The transmitter bit rate is selected according to serial data received from a telephone exchange with a message to be transmitted. The transmitter has a degree indicating system producing a first signal representative of a degree N when it receives a signal which is representative of a bit rate N.multidot.R. It has interleaving means for N-degree interleaving of input data having the bit rate N.multidot.R, in response to the first signal, to produce an interleaved signal; and transmitting means for transmitting said interleaved signal. The receiver has means for receiving a signal whose bit rate is N.multidot.R bit rate indicating means for outputting a first signal which is representative of N; de-interleaving means for N-degree de-interleaving the received signal, in response to the first signal, to produce a de-interleaved signal; and deciding means for deciding whether or not a paging address number, which may be included in the de-interleaved signal, is assigned to the receiver. Alarm means may produce an audible alarm in response to an output of the deciding means.