US5206855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple frequency message system
Assignee: Motorola Solutions Inc
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Filing: 1990-04-06
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Granted: 1993-04-27
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Expires: 2010-04-06
Abstract
Abstract A transmitter system for transmitting coded message signals on a plurality of channels of which at least one channel to be assigned to each of a plurality of geographical areas. The coded message signals include channel identification information and message information being transmitted in a sequence of coded transmission slots on each of the plurality of channels. The sequence of coded transmission slots are transmitted offset in time such that a particular transmission slot is not substantially simultaneously transmitted on any of the plurality of channels. A receiver capable of receiving the coded message signals during a predetermined coded transmission slot being transmitted on the plurality of channels is also described. The receiver includes a channel selecting circuit responsive to detecting the predetermined channel identification information transmitted during the predetermined coded transmission slot on the predetermined channel, for maintaining reception during the predetermined transmission slot on the predetermined channel. The receiver also includes a memory for storing active channel information for a given geographic area, and the channel selecting circuit is responsive to the active channel information for selecting the reception of only the active channels in the particular geographical area when the channel identification information detected during the predetermined coded transmission slot on the predetermined channel does not match predetermined channel identification information.
Inventors
- 👤 Robert J. Schwendeman
- 👤 David F. Willard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:59
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/18; H04W88/185; H04W88/187
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
249 words
A receiver means, capable of receiving coded message signals, including channel identification information assigned to each of a plurality of channels in a plurality of geographic areas and message information being transmitted in a predetermined sequence of coded transmission slots on each of a plurality of channels, each coded transmission slot of the predetermined sequence being transmitted sequentially on each of the plurality of channels so as to preclude the substantially simultaneous transmission of a correspondingly coded transmission slot on any two channels in a particular geographic area, said receiver means comprising: a receiver portion, capable of receiving the transmitted coded message signals during a predetermined one of the coded transmission slots being transmitted on each of the plurality of channels, said receiver portion having an output for detected channel identification information; memory means for storing predetermined channel identification information, and active channel information indicating the active channels of the plurality of channels capable of being received for at least one geographic area; channel selecting means being responsive to the active channel information for selecting the reception by said receiver portion of only the active channels in the particular geographical area when the channel identification information detected on the predetermined one of the plurality of channels does not match the predetermined channel identification information; and battery saver means being responsive to the active channel information for supplying power to said receiver portion during the predetermined coded transmission slots on the active channels being selected in the particular geographical area.
Claim 2
Dependent Claim
249 words
A receiver means, capable of receiving coded message signals, including channel identification information assigned to each of a plurality of channels in a plurality of geographic areas and message information being transmitted in a predetermined sequence of coded transmission slots on each of a plurality of channels, each coded transmission slot of the predetermined sequence being transmitted sequentially on each of the plurality of channels so as to preclude the substantially simultaneous transmission of a correspondingly coded transmission slot on any two channels in a particular geographic area, said receiver means comprising: a receiver portion, capable of receiving the transmitted coded message signals during a predetermined one of the coded transmission slots being transmitted on each of the plurality of channels, said receiver portion having an output for detected channel identification information; memory means for storing predetermined channel identification information, and active channel information indicating the active channels of the plurality of channels capable of being received for at least one geographic area; channel selecting means being responsive to the active channel information for selecting the reception by said receiver portion of only the active channels in the particular geographical area when the channel identification information detected on the predetermined one of the plurality of channels does not match the predetermined channel identification information; and battery saver means being responsive to the active channel information for supplying power to said receiver portion during the predetermined coded transmission slots on the active channels being selected in the particular geographical area.
Claim 3
Dependent Claim
47 words
The receiver means according to claim 1, wherein said battery saver means being further responsive to the active channel information for inhibiting the supply of power to said receiver portion during the predetermined coded transmission slots on the channels not being selected in the particular geographical area.
Claim 4
Dependent Claim
114 words
The receiver means according to claim 1, further comprising: channel detecting means, coupled to said receiver portion, for detecting the absence of any of the plurality of channels in a particular geographic area, and for generating inactive channel information in response thereto, said channel selecting means being further responsive to the inactive channel information for sequentially selecting for reception by said receiver portion only the active channels in the sequence of the plurality of channels in the particular geographical area, and said battery saver means being further responsive to the inactive channel information for supplying power to said receiver portion only during the predetermined coded transmission slot during which the active channel is selected.
Claim 5
Dependent Claim
46 words
The receiver means according to claim 3, wherein said battery saver means being further responsive to the inactive channel information for inhibiting the supply of power to said receiver portion during each of the predetermined coded transmission slots on each of the channels not being selected.
Claim 6
Dependent Claim
73 words
The receiver according to claim 3, further comprising timing means, for generating timing signals, wherein said channel selecting means being responsive to the timing signals for sequentially selecting, at predetermined time intervals, the reception by the receiver portion of the predetermined coded transmission slot on each of the plurality of channels, and wherein said channel detecting means, further detecting the absence of any of the plurality of channels in the particular geographic area.
Claim 7
Dependent Claim
30 words
The receiver means according to claim 3, wherein said channel detecting means generates the inactive channel information in response to a channel being detected absent a predetermined number of times.
Claim 8
Dependent Claim
18 words
The receiver means according to claim 3, wherein said channel detecting means is a received signal strength indicator.
Claim 9
Dependent Claim
214 words
A receiver means, capable of receiving coded message signals, including channel identification information assigned to each of a plurality of channels in a plurality of geographic areas and message information being transmitted in a predetermined sequence of coded transmission slots on each of a plurality of channels, each coded transmission slot of the predetermined sequence being transmitted sequentially on each of the plurality of channels so as to preclude the substantially simultaneous transmission of a correspondingly coded transmission slot on any two channels in a particular geographic area, said receiver means comprising: a receiver portion, capable of receiving the transmitted coded message signals during a predetermined one of the coded transmission slots being transmitted on each of the plurality of channels, said receiver portion having an output for detected channel identification information; memory means for storing predetermined channel identification information, and active channel information indicating the active channels of the plurality of channels capable of being received for at least one geographic area; channel selecting means being further responsive to the active channel information for selecting the reception by said receiver portion of only the active channels in the particular geographical area when the channel identification information detected on the predetermined one of the plurality of channels does not match predetermined channel identification information.
Claim 10
Dependent Claim
214 words
A receiver means, capable of receiving coded message signals, including channel identification information assigned to each of a plurality of channels in a plurality of geographic areas and message information being transmitted in a predetermined sequence of coded transmission slots on each of a plurality of channels, each coded transmission slot of the predetermined sequence being transmitted sequentially on each of the plurality of channels so as to preclude the substantially simultaneous transmission of a correspondingly coded transmission slot on any two channels in a particular geographic area, said receiver means comprising: a receiver portion, capable of receiving the transmitted coded message signals during a predetermined one of the coded transmission slots being transmitted on each of the plurality of channels, said receiver portion having an output for detected channel identification information; memory means for storing predetermined channel identification information, and active channel information indicating the active channels of the plurality of channels capable of being received for at least one geographic area; channel selecting means being further responsive to the active channel information for selecting the reception by said receiver portion of only the active channels in the particular geographical area when the channel identification information detected on the predetermined one of the plurality of channels does not match predetermined channel identification information.
Claim 11
Dependent Claim
43 words
The receiver means according to claim 8, further comprising battery saver means being responsive to the active channel information for supplying power to said receiver portion during the predetermined coded transmission slots on the active channels being selected in the particular geographical area.
Claim 12
Dependent Claim
47 words
The receiver means according to claim 9, wherein said battery saver means being further responsive to the active channel information for inhibiting the supply of power to said receiver portion during the predetermined coded transmission slots on the channels not being selected in the particular geographical area.
Claim 13
Dependent Claim
114 words
The receiver means according to claim 9, further comprising: channel detecting means, coupled to said receiver portion, for detecting the absence of any of the plurality of channels in a particular geographic area, and for generating inactive channel information in response thereto, said channel selecting means being further responsive to the inactive channel information for sequentially selecting for reception by said receiver portion only the active channels in the sequence of the plurality of channels in the particular geographical area, and said battery saver means being further responsive to the inactive channel information for supplying power to said receiver portion during the predetermined coded transmission slot during which the active channel is selected channel.
Claim 14
Dependent Claim
46 words
The receiver means according to claim 11, wherein said battery saver means being further responsive to the inactive channel information for inhibiting the supply of power to said receiver portion during each of the predetermined coded transmission slots on each of the channels not being selected.
Claim 15
Dependent Claim
73 words
The receiver according to claim 11, further comprising timing means, for generating timing signals, wherein said channel selecting means being responsive to the timing signals for sequentially selecting, at predetermined time intervals, the reception by the receiver portion of the predetermined coded transmission slot on each of the plurality of channels, and wherein said channel detecting means, further detecting the absence of any of the plurality of channels in the particular geographic area.
Claim 16
Dependent Claim
30 words
The receiver means according to claim 11, wherein said channel detecting means generates the inactive channel information in response to a channel being detected absent a predetermined number of times.
Claim 17
Dependent Claim
18 words
The receiver means according to claim 11, wherein said channel detecting means is a received signal strength indicator.
References Cited (Backward Citations)
US4086537A
Cited
US4392135A
Cited
US4398192A
Cited
US4551855A
Cited
US4644347A
Cited
US4658416A
Cited
US4736461A
Cited
US4679225A
Cited
US4792984A
Cited
US4747101A
Cited
US4748681A
Cited
US4741049A
Cited
US4839639A
Cited
US4718109A
Cited
US4779262A
Cited
US4755816A
Cited
US4860003A
Cited
US4914649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-26 | 1996-10-26 | 1997-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-26 | 2000-10-26 | 2001-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-26 | 2004-10-26 | 2005-04-27 | $7700.00 | Window Closed / Lapsed |