Radio paging system with voice transfer function and radio pager
First Claim
1. A radio pager comprising demodulation part for demodulating a radio signal which is transmitted over a radio network and which contains voice information and other information;
- an analog-to-digital converter for digitizing said voice information taken from the demodulated radio signal if said voice information is found to be analog format following the demodulation;
memory means for storing the digitized voice information;
a digital-to-analog converter for converting said digitized voice information in said memory means to an analog signal;
informing means for informing a user carrying said radio pager of the memory presence of said voice information in said memory means including means for displaying the amount of said voice information stored in said memory means; and
output means for reproducing and outputting said voice information held in said memory means as an audible signal based on said analog signal in response to an output designating operation by said user.
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Accused Products
Abstract
A radio paging system with voice transfer function for transmitting a voice message input from an ordinary push-button telephone set to a small-sized receive-only unsophisticated radio pager. A paging station is provided to transmit by radio the message from a telephone network to the radio pager as follows: voice information constituting the message is first converted from analog to digital format, compressed, stored in memory, and scrambled by a privacy function part for transmission. The radio pager in turn demodulates the received information, stores it in memory, retrieves a necessary message therefrom as designated, descrambles the designated message from scrambled state, expands the message from compressed state, and outputs the message as an audible output. In this manner, the user carrying the radio pager is able to get the message from the caller without the risk of being tapped by a third party.
56 Citations
18 Claims
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1. A radio pager comprising demodulation part for demodulating a radio signal which is transmitted over a radio network and which contains voice information and other information;
- an analog-to-digital converter for digitizing said voice information taken from the demodulated radio signal if said voice information is found to be analog format following the demodulation;
memory means for storing the digitized voice information;
a digital-to-analog converter for converting said digitized voice information in said memory means to an analog signal;
informing means for informing a user carrying said radio pager of the memory presence of said voice information in said memory means including means for displaying the amount of said voice information stored in said memory means; and
output means for reproducing and outputting said voice information held in said memory means as an audible signal based on said analog signal in response to an output designating operation by said user. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- an analog-to-digital converter for digitizing said voice information taken from the demodulated radio signal if said voice information is found to be analog format following the demodulation;
Specification