ALARM SYSTEM UTILIZING A DIGITAL RADIO LINK

• US 3,713,125 A
• Filed: 07/06/1971
• Issued: 01/23/1973
• Est. Priority Date: 07/06/1971
• Status: Expired due to Term

• Current Assignee: Cecil John Miller
• Original Assignee: Cecil John Miller
• Inventors: Miller, Cecil John
• Primary Examiner(s): Pitts, Harold I.
• Application Number:
  US05/160,117
• Time in Patent Office: 567 Days
• Field of Search: 340/224P 343/225R
• US Class Current: 340/539.14
• CPC Class Codes: G08B 25/085 using central distribution transmission lines
• CPC Class Codes: G08B 27/001 Signalling to an emergency team, e.g. firemen
• CPC Class Codes: H04N 7/10 Adaptations for transmission by electrical cable H04N7/12 takes precedence

Abstract

An automatic digital-encoding burglary-robbery apprehension system is described which utilizes existing telephone lines and direct radio transmission links from an area control center to a patrol car or helicopter. The transmitted alarm signal is digitally coded to provide location identification.

Claims

1. An alarm system comprising:

means for generating a discrete alarm signal at a protected site in response to the occurrence of an emergency event;

encoding means connected to said alarm signal generating means at said site and responsive to the initiation of said alarm signal for generating a digital code uniquely identifying the location of said site;

radio transmitting means at a fixed location remote from said protected site for broadcasting the output of said encoding means;

a telephone transmission line interposed between said protected site and said radio transmitting means;

automatic telephone dialing means for interconnecting said encoding means and said radio transmitting means via said telephone transmission line whenever said encoding means responds to the initiation of said alarm signal, whereby said digital code is supplied to said radio transmitting means;

a mobile radio receiver remote from said fixed location for picking up said digital code broadcast from said transmitting means;

first digital decoding means connecting to said receiver, and responsive to the output therefrom, for converting said digital code to a geographic address code corresponding to the location of said protected site; and

means connected to the output of said first digital decoding means and responsive thereto, for displaying said geographical address code.

2. An alarm system as defined in claim 1 including:

means for selectively modifying said digital code generated by said encoding means so as to permit an arbitrary identification of said site.

3. An alarm system as defined in claim 1 wherein said means for displaying said digital code includes:

means for converting said broadcast code to a digital code differing from the digital code generated by said encoding means.

4. An alarm system as defined in claim 1, including:

second digital decoding means connected to said telephone transmission line at said fixed location for converting the digital code supplied via said telephone transmission line to a geographic address code corresponding to the location of said protected site; and

means connected to the output of said second decoding means, and responsive thereto, for displaying said geographic address code.

5. An alarm system as defined in claim 1, including:

automatic printer means connected to the output of said first digital decoding means, and responsive thereto, for recording said geographic address code.

6. An alarm system as defined in claim 4, including:

automatic printer means connected to the output of said second digital decoding means at said fixed location, and responsive thereto, for recording said geographic address code.

7. An alarm system as defined in claim 1 wherein said telephone transmission line comprises a community antenna television coaxial line.