Emergency vehicle radio transmission system
First Claim
1. An emergency radio transmission system for operating at a location wherein a number of remote transmitters are collectively transmitting a number of remote signals on a number of selected frequencies, the emergency radio transmission system comprising:
- a. frequency determining means for determining the number of selected frequencies at the location; and
b. transmitting means operative in combination with said frequency determining means for transmitting a local signal on said number of selected frequencies.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for, and method of, providing an emergency signal over preselected frequencies of various radio bands such that the operators of nearby motor vehicles, or other emergency vehicles, or the like, may respond accordingly. The preselected frequencies may be selected to correspond to radio station frequencies, police frequencies, emergency frequencies, etc. which are active at a corresponding location. However, because the frequencies may be preselected, sensitive radio frequencies, for example those used by fire fighting units, police units and other emergency systems, may be excluded from the selection. Consistent therewith, the selected frequencies may be provided by a user, a scanner, or any other means for selecting appropriate frequencies. The power applied to the emergency signal may be adjusted such that only vehicles within a predefined range relative to the transmitting unit are affected.
49 Citations
21 Claims
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1. An emergency radio transmission system for operating at a location wherein a number of remote transmitters are collectively transmitting a number of remote signals on a number of selected frequencies, the emergency radio transmission system comprising:
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a. frequency determining means for determining the number of selected frequencies at the location; and b. transmitting means operative in combination with said frequency determining means for transmitting a local signal on said number of selected frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for transmitting a selected signal from a first vehicle to a second vehicle comprising:
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a. a frequency selection element for selecting a plurality of frequencies which are active at a particular location; b. a modulation element for modulating the selected signal and for providing a modulated signal therefrom; c. a frequency control element coupled to said frequency selection element and further coupled to said modulation element for stepping a reference frequency signal through a plurality of pre-mix frequencies at a predetermined rate, each of said plurality of pre-mix frequencies corresponding to one of said plurality of selected frequencies; d. a mixing element coupled to said modulation element and further coupled to said frequency control element for mixing said modulated signal and said reference frequency signal, and for providing a post-mix signal therefrom; and e. a transmitting element coupled to said mixing element for transmitting said post-mix signal from said first vehicle to said second vehicle. - View Dependent Claims (12, 13, 14)
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15. A method for providing a local signal from a first vehicle having a location to a second vehicle wherein a number of remote transmitters are collectively transmitting a number of remote signals on a number of selected frequencies at the location of the first vehicle, the method comprising the steps of:
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a. determining the selected frequencies of the remote signals at the location of the first vehicle, said determining step providing a plurality of preselected frequencies; and b. sending said local signal over said plurality of preselected frequencies to said second vehicle.
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16. A method for providing a local signal from a first vehicle having a location to a second vehicle wherein a number of remote transmitters are collectively transmitting a number of remote signals on a number of selected frequencies at the location of the first vehicle, the method comprising the steps of:
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a. determining the selected frequencies of the remote signals at the location of the first vehicle, said determining step providing a plurality of preselected frequencies; b. sending said local signal over a first one of said plurality of preselected frequencies to said second vehicle; c. sending said local signal over a next one of said plurality of preselected frequencies to said second vehicle; d. ascertaining if said local signal has been sent over all of said plurality of preselected frequencies; and e. repeating step (c) if said ascertaining step concludes that said local signal has not been sent over all of said plurality of preselected frequencies.
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17. A method for providing a local signal from a first vehicle havinq a location to a second vehicle wherein a number of remote transmitters are collectively transmitting a number of remote signals on a number of selected frequencies at the location of the first vehicle, the method comprising the steps of:
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a. determining the selected frequencies of the remote signals at the location of the first vehicle, said determining step providing a plurality of preselected frequencies; and b. time division multiplexing said local signal over all of said plurality of preselected frequencies.
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18. A method for providing a local signal from a first vehicle having a location to a second vehicle wherein a number of remote transmitters are collectively transmitting a number of remote signals on a number of selected frequencies at the location of the first vehicle, the method comprising the steps of:
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a. determining the selected frequencies of the remote signals at the location of the first vehicle, said determining step providing a plurality of preselected frequencies; b. sampling said local signal at a predetermined rate thereby providing a sampled signal; and c. time division multiplexing said sampled signal over all of said plurality of preselected frequencies. - View Dependent Claims (19)
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20. A method for providing a local signal from a first vehicle having a location to a second vehicle, comprising:
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a. determining the frequencies of a number of remotely generated signals that are active at the location of the first vehicle, said determining step (a) providing a plurality of preselected frequencies; b. modulating said local signal thereby providing a modulated signal; c. mixing said modulated signal with a reference frequency signal thereby providing a post-mix signal having a frequency, said reference frequency signal having a corresponding frequency associated therewith, said frequency of said reference frequency being such that the frequency of said post-mix signal corresponds to one of said plurality of preselected frequencies; d. providing a next reference frequency signal having a next corresponding frequency associated therewith, said next frequency of said next reference frequency signal being such that the resulting post-mix signal corresponds to the next one of said plurality of preselected frequencies; and e. repeating steps (c) and (d).
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21. A method for providing a signal over a number of frequencies, wherein the signal has a corresponding Nyquist sample rate, the method comprising the steps of:
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a. sampling the signal at or above the Nyquist sample rate of the signal, wherein the sampling step samples the signal during a number of sample periods; a. providing the signal over a first one of the number of frequencies during a first one of the number of sample periods; and c. providing the signal over a second one of the number of frequencies during a second one of the number of sample periods.
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Specification