Patent EP0552051A2 successfully refreshed from Google Patents.
EP0552051A2
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EP
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Radio paging system with voice transfer function and radio pager
Assignee: Hitachi Ltd
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Filing: 1993-01-15
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Granted: —
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Expires: 2013-01-15
Abstract
Abstract A radio paging system with voice transfer function for transmitting a voice message input from an ordinary push-button telephone set (1) to a small-sized receive-only unsophisticated radio pager (33). A paging station (14) is provided to transmit by radio the message from a telephone network (7) to the radio pager (33) as follows: voice information constituting the message is first converted from analog to digital format, compressed, stored in memory (6), and scrambled by a privacy function part (7) for transmission. The radio pager (33) in turn demodulates the received information, stores it in memory (24), 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 (30). 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.
Inventors
- 👤 Nobuo Hamamoto
- 👤 Tadashi Onishi
- 👤 Tatsundo Suzuki
- 👤 Minoru Nagata
- 👤 Kenichi Mizuishi
- 👤 Yosuke Tyojyamori
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 03:36
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/18; H04W88/185; H04W88/187; G; G08; G08B; G08B3/00; G08B3/10; G08B3/1008; G08B3/1016; G08B3/1025; G08B5/00; G08B5/22; G08B5/222; G08B5/223; G08B5/224; G08B5/229; H03; H03M; H03M1/00; H03M1/06; H03M1/08; H03M1/0854; H04M; H04M1/00; H04M1/64; H04M1/65; H04M1/6505; H04M11/00; H04M11/02; H04M11/022; H04M3/00; H04M3/42; H04M3/50; H04M3/53; H04M3/533; H04M2203/00; H04M2203/60; H04M2203/609
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
208 words
A radio paging system with voice transfer function having a paging station and a radio pager, said paging station converting to a radio signal a message which is input from a telephone network and which contains voice information, said radio pager receiving said radio signal from said paging station to reproduce said message; said paging station comprising analog-to-digital conversion means for digitizing said voice information; first memory means for temporarily storing the digitized voice information; privacy function means for scrambling the voice information output by said first memory means; and a transmission part for modulating the scrambled data for transmission to said radio pager in the form of said radio signal; said radio pager comprising a demodulation part for demodulating said radio signal; second memory means for storing said digitized voice information taken from the demodulated radio signal; privacy cancellation means for descrambling said digitized voice information from said second memory means; digital-to-analog conversion means for converting to an analog signal said voice information taken from the descrambled information; means for informing a user carrying said radio pager of the receipt of said message; and means for outputting said voice information as an audible signal based on said analog signal in response to an operation by said user.
Claim 2
Dependent Claim
93 words
A radio paging system with voice transfer function according to claim 1, wherein said privacy function means of said paging station is constituted by means for dividing into a plurality of banks said voice information stored in time serial fashion into said first memory means and by means for randomly rearranging and reading said plurality of banks, and wherein said privacy cancellation means of said radio pager includes means for arranging, in the reverse order of the rearranging by said privacy function means, said plurality of banks back to the original order thereof.
Claim 3
Dependent Claim
56 words
A radio paging system with voice transfer function according to claim 2, wherein said privacy function means has a plurality of predetermined rearranging patterns in which to rearrange said plurality of banks, and includes updating means for updating the order in which each of said plurality of predetermined rearranging patterns is used for each message transmission.
Claim 4
Dependent Claim
36 words
A radio paging system with voice transfer function according to claim 3, further comprising means for randomly updating the order in which each of said plurality of predetermined rearranging patterns is used for each message transmission.
Claim 5
Dependent Claim
43 words
A radio paging system with voice transfer function according to claim 1, wherein said paging station has data compression means for compressing data in time, and said radio pager has data expansion means for expanding the data compressed by said data compression means.
Claim 6
Dependent Claim
39 words
A radio paging system with voice transfer function according to claim 1, wherein the sampling frequency of said analog-to-digital conversion means of said paging station is the same as that of said digital-to-analog conversion means of said radio pager.
Claim 7
Dependent Claim
232 words
A radio paging system with voice transfer function having a paging station and a radio pager, said paging station converting to a radio signal a message which is input from a telephone network and which contains voice information, said radio pager receiving said radio signal from said paging station to reproduce said message; said paging station comprising analog-to-digital conversion means for digitizing said voice information; first memory means for temporarily storing the digitized voice information; data compression means for compressing for transmission the content of said voice information from said first memory means; and a transmission part for modulating the compressed voice information for transmission to said radio pager in the form of said radio signal; said radio pager comprising a demodulation part for demodulating said radio signal; second memory means for storing said digitized voice information taken from the demodulated radio signal; data expansion means for expanding said compressed voice information back to the original content thereof, said data expansion means being located on any one of the input and the output sides of said second memory means; digital-to-analog conversion means for converting the expanded voice information to an analog signal; means for informing a user carrying said radio pager of the receipt of said voice information; and means for outputting said voice information as an audible signal based on said analog signal in response to an operation by said user.
Claim 8
Dependent Claim
241 words
A radio paging system with voice transfer function having a paging station and a radio pager, said paging station converting to a radio signal a message which is input from a telephone network and which contains voice information, said radio pager receiving said radio signal from said paging station to reproduce said message; said paging station comprising first analog-to-digital conversion means for digitizing said voice information; first memory means for temporarily storing the digitized voice information; privacy function means for scrambling the voice information output by said first memory means; first digital-to-analog conversion means for converting the scrambled voice information to an analog signal; and a transmission part for modulating said analog signal output by said first digital-to-analog conversion means for transmission to said radio pager in the form of said radio signal; said radio pager comprising a demodulation part for demodulating said radio signal; second analog-to-digital conversion means for digitizing the demodulated scrambled voice information in analog format; second memory means for storing the digitized voice information from said second analog-to-digital conversion means; privacy cancellation means for descrambling the scrambled voice information from said second memory means; second digital-to-analog conversion means for converting the descrambled voice information to an analog signal; means for informing a user carrying said radio pager of the receipt of said message; and means for outputting said voice information as an audible signal based on said analog signal in response to an operation by said user.
Claim 9
Dependent Claim
35 words
A radio paging system with voice transfer function according to claim 8, wherein said message when transmitted is identified to be in any one of analog and digital formats by use of an identification code.
Claim 10
Dependent Claim
135 words
A radio pager comprising a 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 in 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 presence of said voice information 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.
Claim 11
Dependent Claim
26 words
A radio pager according to claim 10, wherein said informing means includes means for displaying the amount of said voice information stored in said memory means.
Claim 12
Dependent Claim
25 words
A radio pager according to claim 10, wherein said informing means includes means for displaying the type of the information received by said radio pager.
Claim 13
Dependent Claim
39 words
A radio pager according to claim 10, wherein said informing means includes means for displaying the type of the information received, and said output means includes means for designating the type of the information to be reproduced and output.
Claim 14
Dependent Claim
50 words
A radio pager according to claim 10, wherein said output means includes means for detecting a voiceless period of a digital voice signal as well as means for forcibly setting to an alternate zero level said digital voice signal to be input to said analog-to-digital converter during said voiceless period.
Claim 15
Dependent Claim
68 words
A radio pager according to claim 14, wherein said voiceless period is detected on the basis of outputs from a pair of comparators comparing two digital signals in magnitude, one digital signal being one to be reproduced, the other digital signal being one which corresponds to any of adjustable positive and negative levels each regarded as voiceless for a predetermined period of time in said digital voice signal.
Claim 16
Dependent Claim
37 words
A radio pager according to claim 10, wherein said output means includes means for detecting voiceless periods of said digitized voice information as well as time expansion means for expanding said voiceless periods for time expansion playback.
Claim 17
Dependent Claim
37 words
A radio pager according to claim 10, wherein said output means includes means for detecting voiceless periods of said digitized voice information as well as time compression means for compressing said voiceless periods for time compression playback.
Claim 18
Dependent Claim
27 words
A radio pager according to claim 17, wherein said time compression means is implemented by performing an address updating operation of said memory means faster than usual.
Claim 19
Dependent Claim
17 words
A radio pager according to claim 1, said radio pager being incorporated in a card size case.
Claim 20
Dependent Claim
18 words
A radio pager according to claim 1, said radio pager being incorporated in the case of a wristwatch.
Claim 21
Dependent Claim
17 words
A radio pager according to claim 20, wherein the watchband of said wristwatch doubles as an antenna.
Claim 22
Dependent Claim
27 words
A radio pager according to claim 20, wherein the face plate of said wristwatch contains a piezoelectric device acting as a flat speaker outputting reproduced voice messages.
Claim 23
Dependent Claim
60 words
A radio pager according to claim 20, wherein the back side of said wristwatch has a plurality of electrodes producing a low voltage not harmful to the human body, said low voltage causing a small current to flow in order to stimulate the skin of a user wearing said wristwatch, thereby informing said user of the receipt of a message.
Claim 24
Dependent Claim
22 words
A radio pager according to claim 16, said radio pager being incorporated in a card size case together with a small speaker.
Claim 25
Dependent Claim
25 words
A radio pager according to claim 10, further comprising means for varying the volume of any one of a paging beep and a voice message.
Claim 26
Dependent Claim
32 words
A radio pager according to claim 1, wherein said second memory means has addresses corresponding to a plurality of messages and includes a data memory circuit accessed by use of said addresses.
Claim 27
Dependent Claim
18 words
A radio pager according to claim 10, wherein said memory means is constituted by a semiconductor memory device.
Claim 28
Dependent Claim
23 words
A radio pager according to claim 10, further comprising a circuit for eliminating quantization noise which is generated when voice information is digitized.
References Cited (Backward Citations)
No citation records indexed.
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