Patent EP0280543A2 successfully refreshed from Google Patents.
EP0280543A2
Expired / Lapsed
EP
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Paging system
Assignee: NEC Corp
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Filing: 1988-02-25
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Granted: —
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Expires: 2008-02-25
Abstract
Abstract A paging system allows an on-board radio unit (14) of a vehicle telephone for business use to serve as a repeater as needed. An on-board repeater (16) is mounted on the same vehicle as the on-board radio unit (14) while a portable unit (18) is removably mounted on the repeater. When the portable unit is removed from the on-board repeater, the on-board radio unit functions as a repeater. Even when a person who uses the vehicle on which the telephone is mounted is away from the vehicle with the portable unit, a desired voice message can be transferred to the person immediately.
Inventors
- 👤 Teruaki C/O Nec Corporation Kasugai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 12:53
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A paging system comprising: a central radio station for collectively controlling said system; an on-board radio unit connected to said central radio station by a first channel to receive a first call signal and a voice message from said central radio station while transmitting to said central radio station an absence answer signal and a repeat start signal which are generated at said on-board radio unit; an on-board repeater electrically connected to said on-board radio unit and mounted on the same vehicle as said on-board radio unit; and a portable unit removably mounted on said on-board repeater and, when removed from said repeater to be carried, connected to said repeater by a second channel which is different from said first channel.
Claim 2
Dependent Claim
121 words
A paging system comprising: a central radio station for collectively controlling said system; an on-board radio unit connected to said central radio station by a first channel to receive a first call signal and a voice message from said central radio station while transmitting to said central radio station an absence answer signal and a repeat start signal which are generated at said on-board radio unit; an on-board repeater electrically connected to said on-board radio unit and mounted on the same vehicle as said on-board radio unit; and a portable unit removably mounted on said on-board repeater and, when removed from said repeater to be carried, connected to said repeater by a second channel which is different from said first channel.
Claim 3
Dependent Claim
135 words
A paging system as claimed in claim 1, wherein said on-board repeater comprises: detector means for detecting whether or not said portable unit is mounted on said on-board repeater; signal generating means for generating said absence answer signal, said repeat start signal and a second call signal which is meant for said portable unit; and control means for, when said portable unit is not mounted on said on-board repeater, responding to a call receive signal, which said on-board radio unit produces in response to said first call signal, by controlling said signal generating means to send said absence answer signal and said repeat start signal to said on-board radio unit while, at the same time, sending said second call signal to said portable unit, said control means sending said voice message to said portable unit.
Claim 4
Dependent Claim
49 words
A paging system as claimed in claim 2, wherein said portable unit comprises control means for decoding said second call signal received and, if said second call signal is meant for said portable unit, causing a speaker to produce a voice message which is received after said call signal.
References Cited (Backward Citations)
No citation records indexed.
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